@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #60a5fa;
  --primary-accent: #eff6ff;
  --primary-glow: rgba(37, 99, 235, 0.35);
  --primary-rgb: 37, 99, 235;
  --bg-gradient: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
  --text-main: #1c3d5a;
  --text-muted: #64748b;
  --white: #ffffff;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #22c55e;
  --warning: #f59e0b;
  --card-bg: rgba(255, 255, 255, 0.85);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --border-color: rgba(30, 86, 160, 0.12);
  --glass-border: 1px solid rgba(255, 255, 255, 0.85);
  --specular-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.6);
  --shadow-sm: 0 4px 6px -1px rgba(14, 56, 122, 0.05), 0 2px 4px -2px rgba(14, 56, 122, 0.05);
  --shadow-md: 0 10px 15px -3px rgba(14, 56, 122, 0.08), 0 4px 6px -4px rgba(14, 56, 122, 0.08);
  --shadow-lg: 0 20px 25px -5px rgba(14, 56, 122, 0.1), 0 8px 10px -6px rgba(14, 56, 122, 0.1);
  --shadow-active: 0 0 0 3px rgba(30, 86, 160, 0.25);
  --radius: 16px;
  --radius-sm: 8px;
  --radius-lg: 24px;
  --transition: background-color 0.3s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.3s cubic-bezier(0.4, 0, 0.2, 1), color 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1), transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

a, button, .btn, .profile-menu-section-header, .profile-menu-item, .mobile-bottom-nav-item, .nav-link, .ui-toggle-switch {
  user-select: none;
  -webkit-user-select: none;
}

body {
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-main);
  background: var(--bg-gradient);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* App structure */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.main-content {
  flex: 1;
  padding: 100px 24px 60px; /* Spacer for fixed navbar */
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
}

.page-view {
  display: none;
  width: 100%;
}

/* Header & Navbar */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background: rgba(243, 248, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  z-index: 100;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 40px;
  transition: var(--transition);
}

.logo {
  display: flex;
  align-items: center;
  font-size: 22px;
  font-weight: 800;
  color: var(--primary-dark);
  text-decoration: none;
  gap: 10px;
}

.logo-dot {
  width: 14px;
  height: 14px;
  background-color: var(--primary);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
}

.nav-link {
  text-decoration: none;
  color: var(--text-muted);
  padding: 8px 14px;
  font-weight: 500;
  border-radius: 20px;
  font-size: 14px;
  white-space: nowrap;
  transition: var(--transition);
}

.nav-link:hover {
  color: var(--primary-dark);
  background-color: rgba(30, 86, 160, 0.05);
}

.nav-link.active {
  color: var(--white) !important;
  background-color: var(--primary);
  box-shadow: 0 4px 15px rgba(30, 86, 160, 0.3);
}

.user-tag {
  font-size: 12px;
  padding: 3px 8px;
  background-color: var(--primary-accent);
  color: var(--primary-dark);
  border-radius: 6px;
  font-weight: 600;
  text-transform: capitalize;
  margin-left: 5px;
}

/* Hero Section */
.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
  padding: 40px 0;
  margin-bottom: 60px;
}

@media (max-width: 968px) {
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

.hero-content h1 {
  font-size: 54px;
  line-height: 1.15;
  font-weight: 800;
  color: var(--primary-dark);
  margin-bottom: 24px;
}

.hero-content h1 span {
  color: var(--primary);
  position: relative;
}

.hero-content p {
  font-size: 18px;
  color: var(--text-muted);
  margin-bottom: 36px;
  max-width: 600px;
}

@media (max-width: 968px) {
  .hero-content p {
    margin-left: auto;
    margin-right: auto;
  }
}

.hero-actions {
  display: flex;
  gap: 16px;
}

@media (max-width: 968px) {
  .hero-actions {
    justify-content: center;
  }
}

/* Cards & Containers */
.card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 30px;
  box-shadow: var(--shadow-md);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.why-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 35px;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(30, 86, 160, 0.05);
}

.why-card h3 {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 20px;
}

.why-list {
  list-style: none;
}

.why-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  margin-bottom: 14px;
  color: var(--text-main);
  font-weight: 500;
}

.why-icon {
  color: var(--success);
  flex-shrink: 0;
}

/* Announcements */
.announcements-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.section-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 24px;
  font-weight: 700;
  color: var(--primary-dark);
}

.announcements-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.announcement-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: var(--transition);
}

.announcement-card:hover {
  box-shadow: var(--shadow-md);
}

.announcement-card h4 {
  font-size: 18px;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.announcement-date {
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
  display: block;
}

.announcement-content {
  font-size: 15px;
  color: var(--text-main);
}

.announcement-delete {
  position: absolute;
  top: 20px;
  right: 20px;
  background: transparent;
  border: none;
  color: var(--danger);
  cursor: pointer;
  padding: 4px;
  border-radius: 50%;
  transition: var(--transition);
}

.announcement-delete:hover {
  background-color: rgba(239, 68, 68, 0.1);
}

.empty-state {
  text-align: center;
  padding: 40px;
  color: var(--text-muted);
  font-style: italic;
  background-color: rgba(255, 255, 255, 0.4);
  border-radius: var(--radius);
  border: 1px dashed var(--border-color);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 25px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
  outline: none;
}

.btn-primary {
  background-color: var(--primary);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(30, 86, 160, 0.3);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(30, 86, 160, 0.4);
}

.btn-secondary {
  background-color: var(--white);
  color: var(--primary);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--primary-accent);
  color: var(--primary-dark);
  transform: translateY(-2px);
}

.btn-danger {
  background-color: var(--danger);
  color: var(--white);
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
  background-color: var(--danger-hover);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
  border-radius: 20px;
}

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(14, 56, 122, 0.4);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow-y: auto;
  padding: 20px 10px;
}

.modal-content {
  background: var(--white);
  border-radius: var(--radius);
  padding: 35px;
  max-width: 500px;
  width: 90%;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  position: relative;
  animation: modalEnter 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  margin: auto;
}

@keyframes modalEnter {
  from {
    opacity: 0;
    transform: scale(0.95) translateY(10px);
  }
  to {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.modal-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary-dark);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 20px;
  transition: var(--transition);
}

.modal-close:hover {
  color: var(--primary-dark);
}

/* Form Styles */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 8px;
}

.form-input {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-family: inherit;
  font-size: 15px;
  color: var(--text-main);
  background-color: rgba(243, 248, 255, 0.5);
  transition: var(--transition);
}

.form-input:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--white);
  box-shadow: var(--shadow-active);
}

.form-select {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-family: inherit;
  font-size: 15px;
  color: var(--text-main);
  background-color: rgba(243, 248, 255, 0.5);
  transition: var(--transition);
  cursor: pointer;
}

.form-select:focus {
  outline: none;
  border-color: var(--primary);
  background-color: var(--white);
  box-shadow: var(--shadow-active);
}

.form-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 28px;
}

.form-footer {
  text-align: center;
  margin-top: 20px;
  font-size: 14px;
  color: var(--text-muted);
}

.form-footer a {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
}

.form-footer a:hover {
  text-decoration: underline;
}

/* Alert Notification */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 20px;
  font-weight: 500;
}

.alert-danger {
  background-color: #fee2e2;
  color: var(--danger-hover);
  border: 1px solid #fca5a5;
}

.alert-success {
  background-color: #dcfce7;
  color: #15803d;
  border: 1px solid #86efac;
}

.alert-warning {
  background-color: #fef3c7;
  color: #b45309;
  border: 1px solid #fde68a;
}

/* ============================================================
   AUTH PAGE — REAL 3D OPEN BOOK DESIGN & PHYSICS
   ============================================================ */

/* ── Scene Atmosphere ── */
.auth-scene {
  position: relative;
  min-height: calc(100vh - 60px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px 16px 45px;
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 25%, #ebf5fe 0%, #d8ebfe 45%, #c7e0fc 75%, #b6d5fa 100%);
  perspective: 2200px;
}

/* Floating Study Atmosphere Particles */
.auth-bubble {
  position: absolute;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 32%,
    rgba(255,255,255,0.92) 0%,
    rgba(191,219,254,0.5) 55%,
    rgba(59,130,246,0.18) 100%);
  backdrop-filter: blur(2px);
  border: 1px solid rgba(255,255,255,0.75);
  box-shadow: 0 4px 14px rgba(37,99,235,0.12), inset 0 2px 4px rgba(255,255,255,0.8);
  pointer-events: none;
  animation: bubbleRise linear infinite;
  z-index: 0;
}

@keyframes bubbleRise {
  0%   { transform: translateY(0) translateX(0) scale(0.9); opacity: 0; }
  8%   { opacity: 1; }
  50%  { transform: translateY(-45vh) translateX(var(--bx, 24px)) scale(1.05); }
  92%  { opacity: 0.7; }
  100% { transform: translateY(-110vh) translateX(var(--bx2, -18px)) scale(0.7); opacity: 0; }
}

.auth-sparkle {
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  animation: sparklePop ease-in-out infinite;
  z-index: 0;
}

@keyframes sparklePop {
  0%, 100% { transform: scale(0); opacity: 0; }
  50%      { transform: scale(1.8); opacity: 0.9; }
}

/* ── 3D Book Stand & Table Shadow ── */
.real-book-stand {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 980px;
  perspective: 2200px;
  transform-style: preserve-3d;
  animation: bookStandEnter 0.9s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes bookStandEnter {
  0%   { opacity: 0; transform: translateY(40px) rotateX(10deg) scale(0.95); }
  100% { opacity: 1; transform: translateY(0)   rotateX(0deg)  scale(1); }
}

/* ── Hardcover Casing (Leather Binding & Rim) ── */
.real-book-casing {
  position: relative;
  background: linear-gradient(145deg, #091a3e 0%, #17326b 35%, #1e428f 65%, #0f2452 100%);
  border-radius: 22px;
  padding: 12px;
  box-shadow:
    0 38px 85px -16px rgba(15, 30, 66, 0.52),
    0 20px 38px -10px rgba(0, 0, 0, 0.32),
    0 0 0 2px rgba(212, 175, 55, 0.45),
    inset 0 0 0 2px rgba(255, 255, 255, 0.15),
    inset 0 3px 6px rgba(255, 255, 255, 0.25);
  transform-style: preserve-3d;
}

/* Gold Embossed Trim on Cover */
.real-book-casing::before {
  content: '';
  position: absolute;
  inset: 5px;
  border-radius: 18px;
  border: 1.5px solid rgba(212, 175, 55, 0.35);
  pointer-events: none;
}

/* Top & Bottom Spine Headband Bulges */
.real-book-casing::after {
  content: '';
  position: absolute;
  left: 50%;
  top: -5px;
  transform: translateX(-50%);
  width: 36px;
  height: 10px;
  background: linear-gradient(90deg, #b45309, #f59e0b, #d97706, #b45309);
  border-radius: 5px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.4);
}

/* ── Pages Container (Open Leaves) ── */
.book-pages-container {
  position: relative;
  display: flex;
  align-items: stretch;
  min-height: 520px;
  border-radius: 14px;
  background: #f7f4ea;
  transform-style: preserve-3d;
  perspective: 2000px;
}

/* ── Realistic Stacked Page Block Depth (Fore-Edge Thickness) ── */
.book-page-left {
  flex: 1;
  position: relative;
  background: linear-gradient(135deg, #faf7f0 0%, #fdfbf7 60%, #f5f0e3 100%);
  border-radius: 12px 0 0 12px;
  padding: 24px 28px 18px;
  display: flex;
  flex-direction: column;
  box-shadow:
    -3px 3px 0 #ede6d8,
    -6px 6px 0 #e2dad0,
    -9px 9px 0 #d7cec0,
    -12px 12px 0 #cbbfae,
    -16px 16px 22px rgba(0, 0, 0, 0.2),
    inset -24px 0 30px -10px rgba(0, 0, 0, 0.16),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  overflow: hidden;
  z-index: 1;
}

.book-page-right {
  flex: 1;
  position: relative;
  background: linear-gradient(225deg, #faf7f0 0%, #fdfbf7 60%, #f5f0e3 100%);
  border-radius: 0 12px 12px 0;
  padding: 24px 28px 18px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow:
    3px 3px 0 #ede6d8,
    6px 6px 0 #e2dad0,
    9px 9px 0 #d7cec0,
    12px 12px 0 #cbbfae,
    16px 16px 22px rgba(0, 0, 0, 0.2),
    inset 24px 0 30px -10px rgba(0, 0, 0, 0.16),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  overflow: hidden;
  z-index: 1;
}

/* ── Center Book Gutter & Deep Spine Crease ── */
.book-gutter-spine {
  position: relative;
  width: 20px;
  flex-shrink: 0;
  background: linear-gradient(90deg,
    rgba(0,0,0,0.22) 0%,
    rgba(0,0,0,0.08) 30%,
    rgba(0,0,0,0.35) 50%,
    rgba(0,0,0,0.08) 70%,
    rgba(0,0,0,0.22) 100%);
  box-shadow:
    inset -3px 0 5px rgba(0,0,0,0.3),
    inset  3px 0 5px rgba(0,0,0,0.3);
  z-index: 4;
}

/* Stitched thread details along gutter */
.book-gutter-spine::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 10px;
  bottom: 10px;
  width: 2px;
  transform: translateX(-50%);
  background: repeating-linear-gradient(180deg,
    rgba(212, 175, 55, 0.6) 0px,
    rgba(212, 175, 55, 0.6) 8px,
    transparent 8px,
    transparent 14px);
}

/* ── Silky Bookmark Ribbon ── */
.book-ribbon-bookmark {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 22px;
  height: 115px;
  background: linear-gradient(135deg, #dc2626 0%, #b91c1c 60%, #991b1b 100%);
  border-radius: 3px 3px 0 0;
  box-shadow:
    3px 6px 14px rgba(0,0,0,0.35),
    inset 0 1px 1px rgba(255,255,255,0.4);
  z-index: 10;
  pointer-events: none;
}

/* V-notched swallowtail at bottom of ribbon */
.book-ribbon-bookmark::after {
  content: '';
  position: absolute;
  bottom: -9px;
  left: 0;
  width: 0;
  height: 0;
  border-left: 11px solid #b91c1c;
  border-right: 11px solid #b91c1c;
  border-bottom: 9px solid transparent;
}

/* ── Page Headers & Folios ── */
.book-page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 8px;
  margin-bottom: 12px;
  border-bottom: 1px solid rgba(180, 83, 9, 0.25);
  font-size: 10.5px;
  font-weight: 700;
  color: #854d0e;
  letter-spacing: 0.8px;
  text-transform: uppercase;
}

.book-header-badge {
  background: rgba(217, 119, 6, 0.12);
  padding: 2px 7px;
  border-radius: 5px;
  color: #b45309;
}

.book-page-footer {
  margin-top: auto;
  padding-top: 10px;
  text-align: center;
  font-size: 10.5px;
  font-weight: 600;
  color: #92400e;
  letter-spacing: 1px;
  border-top: 1px dashed rgba(180, 83, 9, 0.2);
}

/* ── Left Page Brand Design ── */
.book-brand-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  text-align: center;
  padding: 0 4px;
}

.book-crest {
  margin: 0 auto 8px;
}

.book-crest-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 50%, #3b82f6 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 6px;
  color: #fff;
  box-shadow:
    0 6px 16px rgba(37, 99, 235, 0.35),
    0 0 0 2.5px rgba(212, 175, 55, 0.4),
    inset 0 1px 0 rgba(255,255,255,0.4);
}

.book-crest-icon i {
  width: 24px;
  height: 24px;
}

.book-crest-stars {
  font-size: 10px;
  letter-spacing: 3px;
  color: #d97706;
}

.book-title {
  font-size: 26px;
  font-weight: 900;
  color: #1e3a8a;
  letter-spacing: -0.5px;
  line-height: 1.1;
  margin-bottom: 2px;
  font-family: Georgia, 'Times New Roman', serif;
}

.book-edition {
  font-size: 11px;
  font-weight: 600;
  color: #64748b;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

.book-divider-ornament {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin: 0 auto 10px;
  color: #d97706;
}

.book-divider-ornament span {
  display: inline-block;
  width: 40px;
  height: 1px;
  background: rgba(217, 119, 6, 0.35);
}

.book-desc {
  font-size: 12px;
  color: #475569;
  line-height: 1.5;
  margin-bottom: 12px;
  font-style: italic;
}

.book-features-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  text-align: left;
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(180, 83, 9, 0.15);
  border-radius: 10px;
  padding: 8px 12px;
  margin-bottom: 14px;
}

.book-feature-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: #1e293b;
}

.feature-bullet {
  font-weight: 800;
  color: #2563eb;
  font-size: 10.5px;
  width: 20px;
}

/* Turn Page Action Button */
.btn-turn-page {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 10px 16px;
  border-radius: 10px;
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
  color: #fff;
  border: 1.5px solid rgba(212, 175, 55, 0.4);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 5px 15px rgba(37, 99, 235, 0.28), inset 0 1px 0 rgba(255,255,255,0.25);
  transition: all 0.22s ease;
}

.btn-turn-page:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.4);
  border-color: rgba(212, 175, 55, 0.7);
}

.btn-turn-page .turn-icon {
  font-size: 15px;
  transition: transform 0.25s ease;
}

.btn-turn-page:hover .turn-icon {
  transform: translateX(4px);
}

/* ── Right Page Forms (Login / Signup) ── */
.auth-panel {
  display: none;
}

.auth-panel.active {
  display: block;
}

.book-form-header {
  text-align: center;
  margin-bottom: 16px;
}

.book-form-header h2 {
  font-size: 22px;
  font-weight: 800;
  color: #1e3a8a;
  letter-spacing: -0.5px;
  font-family: Georgia, 'Times New Roman', serif;
}

.book-form-header p {
  font-size: 12px;
  color: #64748b;
  margin-top: 2px;
}

/* Clean Input Styling inside Book */
.book-page-right .form-group {
  margin-bottom: 11px;
}

.book-page-right .form-label {
  font-size: 11.5px;
  font-weight: 700;
  color: #334155;
  margin-bottom: 3px;
}

.book-page-right .form-input {
  background: #ffffff !important;
  border: 1.5px solid #cbd5e1 !important;
  border-radius: 9px !important;
  font-size: 13.5px !important;
  padding-top: 9px !important;
  padding-bottom: 9px !important;
  color: #0f172a !important;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.04) !important;
  transition: all 0.2s ease !important;
}

.book-page-right .form-input:focus {
  border-color: #2563eb !important;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.18), inset 0 1px 2px rgba(0,0,0,0.05) !important;
}

.book-page-right .btn-primary {
  border-radius: 9px !important;
  padding: 10px !important;
  font-size: 13.5px !important;
  font-weight: 700 !important;
  background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%) !important;
  box-shadow: 0 5px 16px rgba(37, 99, 235, 0.32), inset 0 1px 0 rgba(255,255,255,0.3) !important;
  border: none !important;
  transition: all 0.22s ease !important;
}

.book-page-right .btn-primary:hover {
  transform: translateY(-2px) !important;
  box-shadow: 0 8px 22px rgba(37, 99, 235, 0.42) !important;
}

/* Corner Dog-Ear / Page Curl Trigger */
.corner-page-curl {
  position: absolute;
  bottom: 0;
  right: 0;
  width: 70px;
  height: 70px;
  background: linear-gradient(135deg, transparent 50%, #ede6d8 50%, #fdfbf7 75%, #ffffff 100%);
  border-radius: 0 0 14px 0;
  box-shadow: -4px -4px 10px rgba(0,0,0,0.12);
  cursor: pointer;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 6px 8px;
  transition: all 0.25s ease;
  z-index: 3;
}

.corner-page-curl:hover {
  width: 85px;
  height: 85px;
  box-shadow: -6px -6px 16px rgba(0,0,0,0.2);
}

.curl-label {
  font-size: 9px;
  font-weight: 800;
  color: #2563eb;
  letter-spacing: 0.5px;
  transform: rotate(-45deg) translate(6px, -4px);
  user-select: none;
}

/* ── THE 3D FLIPPING SHEET LEAF ── */
.book-turning-leaf {
  position: absolute;
  top: 0;
  left: calc(50% + 11px);
  width: calc(50% - 11px);
  height: 100%;
  transform-origin: left center;
  transform-style: preserve-3d;
  pointer-events: none;
  z-index: 20;
  visibility: hidden;
  border-radius: 0 14px 14px 0;
}

.leaf-face {
  position: absolute;
  inset: 0;
  border-radius: 0 14px 14px 0;
  overflow: hidden;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: linear-gradient(225deg, #faf7f0 0%, #fdfbf7 60%, #f5f0e3 100%);
  box-shadow:
    inset 24px 0 35px -12px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

/* Back Face of Turning Leaf */
.leaf-face-back {
  transform: rotateY(180deg);
  border-radius: 14px 0 0 14px;
  background: linear-gradient(135deg, #f5f0e3 0%, #fdfbf7 40%, #faf7f0 100%);
  box-shadow:
    inset -24px 0 35px -12px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30px;
}

.leaf-back-watermark {
  text-align: center;
  color: rgba(180, 83, 9, 0.25);
}

.leaf-back-watermark i {
  width: 54px;
  height: 54px;
  margin-bottom: 8px;
}

.leaf-back-watermark span {
  display: block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 2px;
}

.leaf-back-watermark p {
  font-size: 11px;
  font-style: italic;
  margin-top: 4px;
}

/* Dynamic Lighting Overlay on Leaf during turn */
.leaf-lighting-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.1s linear;
}

/* Dynamic Page Cast Shadow under turning leaf */
.leaf-cast-shadow {
  position: absolute;
  top: 0;
  left: calc(50% + 11px);
  width: calc(50% - 11px);
  height: 100%;
  border-radius: 0 14px 14px 0;
  background: linear-gradient(to right, rgba(0, 0, 0, 0.45) 0%, rgba(0, 0, 0, 0.15) 40%, transparent 80%);
  pointer-events: none;
  z-index: 8;
  opacity: 0;
}

/* ── Fallback styles for Forgot Password ── */
.auth-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: calc(100vh - 60px);
  padding: 20px 16px 100px;
  position: relative;
}

.auth-card {
  max-width: 460px;
  width: 100%;
  position: relative;
  z-index: 1;
}

.auth-card.card {
  background: rgba(255, 255, 255, 0.95) !important;
  backdrop-filter: blur(20px) !important;
  border: 1px solid rgba(37, 99, 235, 0.2) !important;
  box-shadow: 0 32px 64px -12px rgba(37, 99, 235, 0.22) !important;
  padding: 36px 32px !important;
  border-radius: 20px !important;
}

.auth-header {
  text-align: center;
  margin-bottom: 24px;
}

.auth-header h2 {
  font-size: 24px;
  font-weight: 800;
  color: var(--primary-dark);
}

.auth-header p {
  color: var(--text-muted);
  font-size: 13px;
  margin-top: 4px;
}

/* ── Responsive Mobile & Tablet Layout ── */
@media (max-width: 860px) {
  .real-book-stand {
    max-width: 480px;
  }

  .real-book-casing {
    padding: 10px;
    border-radius: 20px;
  }

  .book-pages-container {
    flex-direction: column;
    min-height: auto;
  }

  .book-page-left {
    border-radius: 14px 14px 0 0;
    padding: 16px 20px 12px;
    box-shadow:
      0 4px 0 #ede6d8,
      0 8px 0 #ded6c6,
      0 12px 20px rgba(0,0,0,0.18),
      inset 0 -18px 24px -10px rgba(0,0,0,0.12);
  }

  .book-page-left .book-switch-container,
  .book-page-left .book-page-footer,
  .book-crest {
    display: none;
  }

  .book-gutter-spine {
    width: 100%;
    height: 12px;
    background: linear-gradient(180deg,
      rgba(0,0,0,0.25) 0%,
      rgba(0,0,0,0.08) 30%,
      rgba(0,0,0,0.35) 50%,
      rgba(0,0,0,0.08) 70%,
      rgba(0,0,0,0.25) 100%);
  }

  .book-gutter-spine::before {
    left: 10px;
    right: 10px;
    top: 50%;
    bottom: auto;
    width: auto;
    height: 2px;
    transform: translateY(-50%);
    background: repeating-linear-gradient(90deg,
      rgba(212, 175, 55, 0.6) 0px,
      rgba(212, 175, 55, 0.6) 8px,
      transparent 8px,
      transparent 14px);
  }

  .book-ribbon-bookmark {
    display: none;
  }

  .book-page-right {
    border-radius: 0 0 14px 14px;
    padding: 22px 18px 20px;
    box-shadow:
      0 6px 0 #ede6d8,
      0 10px 0 #ded6c6,
      0 16px 25px rgba(0,0,0,0.2),
      inset 0 18px 24px -10px rgba(0,0,0,0.12);
  }

  .book-features-list,
  .book-desc {
    display: none;
  }

  .book-title {
    font-size: 22px;
  }

  .book-edition {
    margin-bottom: 0;
  }

  .book-divider-ornament {
    margin: 4px auto 0;
  }

  .corner-page-curl {
    display: none;
  }

  .book-turning-leaf {
    display: none !important;
  }
}

@media (max-width: 480px) {
  .auth-scene {
    padding: 20px 10px 80px;
  }

  .book-page-left,
  .book-page-right {
    padding: 22px 16px 20px;
  }

  .book-title {
    font-size: 22px;
  }
}

/* Radio Group (for Roles signup) */
.role-group {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.role-option {
  position: relative;
}

.role-option input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.role-label {
  display: block;
  text-align: center;
  padding: 12px 8px;
  background-color: rgba(243, 248, 255, 0.5);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  transition: var(--transition);
}

.role-option input:checked + .role-label {
  background-color: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  box-shadow: 0 4px 10px rgba(30, 86, 160, 0.2);
}

/* File Upload Drag-and-drop */
.file-upload-box {
  border: 2px dashed var(--border-color);
  padding: 24px;
  border-radius: var(--radius-sm);
  text-align: center;
  cursor: pointer;
  background-color: rgba(243, 248, 255, 0.3);
  transition: var(--transition);
}

.file-upload-box:hover {
  border-color: var(--primary);
  background-color: rgba(30, 86, 160, 0.02);
}

.file-upload-icon {
  color: var(--primary-light);
  margin-bottom: 12px;
}

/* Folder UI & Layout */
.folder-page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 20px;
}

.folder-breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
}

.breadcrumb-item {
  color: var(--primary);
  cursor: pointer;
  text-decoration: none;
}

.breadcrumb-item:hover {
  text-decoration: underline;
}

.breadcrumb-separator {
  color: var(--text-muted);
}

.breadcrumb-active {
  color: var(--text-main);
}

/* macOS Folders Grid */
.folders-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 24px;
  margin-bottom: 40px;
}

.folder-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  cursor: pointer;
  padding: 16px 8px;
  border-radius: var(--radius);
  transition: var(--transition);
  position: relative;
  background: transparent;
  border: none;
}

.folder-item:hover {
  background-color: rgba(30, 86, 160, 0.08);
  transform: translateY(-2px);
}

.folder-name {
  margin-top: 10px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
  max-width: 110px;
  word-wrap: break-word;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.folder-actions-overlay {
  position: absolute;
  top: 4px;
  right: 4px;
  display: flex;
  gap: 4px;
  opacity: 1;
  transition: var(--transition);
}

.folder-item:hover .folder-actions-overlay {
  opacity: 1;
}

.folder-btn {
  background-color: var(--white);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-muted);
  transition: var(--transition);
}

.folder-btn:hover {
  color: var(--primary-dark);
  background-color: var(--primary-accent);
}

.folder-btn-danger:hover {
  color: var(--white);
  background-color: var(--danger);
}

/* Documents Table / List */
.docs-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.doc-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.doc-card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(30, 86, 160, 0.2);
}

.doc-info {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
}

.doc-icon-container {
  width: 40px;
  height: 40px;
  border-radius: 8px;
  background-color: #fee2e2;
  color: var(--danger);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.doc-meta h5 {
  font-size: 15px;
  font-weight: 600;
  color: var(--primary-dark);
  margin-bottom: 2px;
}

.doc-meta-details {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-muted);
}

.doc-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Papers filtering and layout */
.papers-filter-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 30px;
  background: var(--card-bg);
  padding: 16px 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  align-items: center;
}

@media (max-width: 1150px) {
  .papers-filter-bar {
    flex-direction: column;
    align-items: stretch;
  }
}

.search-input-wrapper {
  position: relative;
  flex: 1;
}

.search-input-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.search-input {
  padding-left: 40px;
}

/* CGPA / SGPA Calculator styling */
.calculator-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
}

.calc-tab {
  padding: 10px 24px;
  border: none;
  background: none;
  font-family: inherit;
  font-weight: 600;
  font-size: 16px;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.calc-tab.active {
  color: var(--primary-dark);
  background-color: var(--primary-accent);
}

.calc-row-header {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 40px;
  gap: 16px;
  padding: 10px 0;
  font-weight: 600;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 12px;
  font-size: 14px;
  color: var(--text-muted);
}

.calc-row {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 40px;
  gap: 16px;
  align-items: center;
  margin-bottom: 12px;
}

@media (max-width: 600px) {
  .calc-row-header {
    display: none;
  }
  .calc-row {
    grid-template-columns: 1fr;
    gap: 8px;
    border: 1px solid var(--border-color);
    padding: 16px;
    border-radius: var(--radius-sm);
    background-color: rgba(255, 255, 255, 0.4);
    position: relative;
  }
  .calc-row button {
    position: absolute;
    top: 8px;
    right: 8px;
  }
}

.result-box {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  text-align: center;
  margin-top: 30px;
  box-shadow: var(--shadow-md);
}

.result-val {
  font-size: 48px;
  font-weight: 800;
  margin: 10px 0;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* Admin Dashboard Approvals */
.dashboard-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 30px;
}

@media (max-width: 968px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }
}

.users-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.user-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--white);
  border: 1px solid var(--border-color);
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.user-info h5 {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary-dark);
}

.user-info p {
  font-size: 13px;
  color: var(--text-muted);
}

.user-actions {
  display: flex;
  gap: 8px;
}

/* Footer styling */
.footer {
  display: none !important;
  background: var(--primary-dark);
  color: var(--white);
  padding: 40px 24px;
  text-align: center;
  margin-top: auto;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 14px;
}

.footer p {
  opacity: 0.8;
  margin-bottom: 8px;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 12px;
}

.footer-link {
  color: var(--white);
  text-decoration: none;
  opacity: 0.7;
  transition: var(--transition);
}

.footer-link:hover {
  opacity: 1;
}

/* Hamburger Button (Mobile Only) */
.btn-hamburger {
  display: none; /* Hidden on desktop */
  align-items: center;
  justify-content: center;
  background-color: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 8px;
  width: 44px;
  height: 44px;
  cursor: pointer;
  transition: var(--transition);
  outline: none;
}
.btn-hamburger:hover {
  background-color: var(--primary-dark);
}
.btn-hamburger i {
  width: 24px;
  height: 24px;
  stroke-width: 2.5;
}

/* Mobile Profile Card styling */
.mobile-profile-card {
  background-color: var(--primary);
  color: var(--white);
  padding: 16px 20px;
  border-radius: var(--radius);
  text-align: center;
  font-weight: 700;
  font-size: 18px;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
  user-select: none;
  transition: var(--transition);
  margin-bottom: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
}
.mobile-profile-card:hover {
  background-color: var(--primary-dark);
}
.mobile-profile-label {
  font-size: 11px;
  opacity: 0.7;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Mobile Links list */
.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}
.mobile-nav-link {
  text-decoration: none;
  color: var(--text-main);
  padding: 12px 16px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: var(--transition);
  background-color: rgba(255, 255, 255, 0.5);
  border: 1px solid var(--border-color);
}
.mobile-nav-link:hover {
  background-color: var(--primary-accent);
  color: var(--primary-dark);
}
.mobile-nav-link.active {
  background-color: var(--primary);
  color: var(--white);
  border-color: var(--primary);
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.2);
}

/* Hide mobile navigation side drawer and overlay on PC (desktop) layout */
.mobile-nav-overlay {
  display: none !important;
}
.mobile-nav-menu {
  display: none !important;
}

/* --- Mobile Responsiveness Adjustments --- */
@media (max-width: 1150px) {
  .navbar {
    position: fixed;
    height: 80px;
    flex-direction: row !important;
    justify-content: space-between !important;
    align-items: center !important;
    padding: 0 20px !important;
    gap: 0 !important;
    text-align: left !important;
  }
  
  .main-content {
    padding-top: 110px !important;
  }
  
  .desktop-nav {
    display: none !important;
  }
  
  .btn-hamburger {
    display: flex !important;
  }
  
  .mobile-nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(14, 56, 122, 0.4);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    z-index: 999;
    opacity: 0;
    transition: opacity 0.3s ease;
  }
  
  .mobile-nav-overlay.open {
    display: block !important;
    opacity: 1;
  }
  
  .mobile-nav-menu {
    position: fixed;
    top: 0;
    right: -305px; /* hidden offscreen */
    width: 290px;
    height: 100vh;
    background: rgba(240, 249, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-left: 1px solid var(--border-color);
    z-index: 1000;
    display: flex !important;
    flex-direction: column;
    padding: 16px;
    gap: 10px;
    box-shadow: -4px 0 25px rgba(14, 56, 122, 0.15);
    transition: right 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    overflow-y: auto;
  }
  
  .mobile-nav-menu.open {
    right: 0;
  }

  .mobile-nav-links {
    gap: 6px;
  }

  .mobile-nav-link {
    padding: 10px 14px;
    font-size: 14px;
  }

  .btn-close-mobile-menu {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    align-self: flex-end;
    margin-bottom: 8px;
    outline: none;
  }
  
  .btn-close-mobile-menu:hover {
    background-color: rgba(37, 99, 235, 0.1);
    color: var(--primary);
  }

  .btn-close-mobile-menu i {
    width: 24px;
    height: 24px;
    stroke-width: 2.5;
  }
  
  .dashboard-grid {
    grid-template-columns: 1fr !important;
  }
}

@media (max-width: 640px) {
  .hero-content h1 {
    font-size: 36px !important;
  }

  .hero-content p {
    font-size: 15px;
    margin-bottom: 24px;
  }
  
  .hero-actions {
    flex-direction: column;
    width: 100%;
    gap: 10px;
    margin-bottom: 60px;
  }
  
  .hero-actions .btn {
    width: 100%;
  }

  .why-card {
    padding: 24px;
  }

  .folder-page-header {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
  }

  .folder-breadcrumbs {
    font-size: 14px;
  }

  /* Document Cards stack layout */
  .doc-card {
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
    padding: 16px;
  }

  .doc-info {
    align-items: flex-start;
  }

  .doc-meta-details {
    flex-wrap: wrap;
    gap: 6px 10px;
  }

  .doc-actions {
    justify-content: flex-end;
    width: 100%;
    border-top: 1px solid var(--border-color);
    padding-top: 12px;
  }

  .doc-actions .btn {
    flex: 1;
    text-align: center;
  }

  .modal-content {
    padding: 20px;
  }

  .role-group {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .user-card {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: 16px;
  }

  .user-actions {
    justify-content: flex-end;
  }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}
.spin-animation {
  display: inline-block;
  animation: spin 1s linear infinite;
}

/* Profile Dropdown styles */
.profile-dropdown-wrapper {
  position: relative;
  display: inline-block;
  margin-left: 12px;
}

.profile-dropdown-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--white);
  border: 1px solid var(--border-color);
  padding: 8px 16px;
  border-radius: 20px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.profile-dropdown-btn:hover {
  background-color: var(--primary-accent);
  border-color: var(--primary-light);
  transform: translateY(-1px);
}

.profile-dropdown-menu {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  width: 250px;
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  z-index: 1000;
  padding: 20px;
  flex-direction: column;
  gap: 12px;
  animation: dropdownFade 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes dropdownFade {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.profile-dropdown-wrapper:hover .profile-dropdown-menu,
.profile-dropdown-wrapper:focus-within .profile-dropdown-menu,
.profile-dropdown-menu.show {
  display: flex;
}

.profile-info-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 12px;
  margin-bottom: 4px;
}

.profile-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  word-break: break-word;
}

.profile-phone {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 4px;
}

.profile-role-container {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
}

.profile-role-label {
  color: var(--text-muted);
}

.profile-role-badge {
  background-color: var(--primary-accent);
  color: var(--primary-dark);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border: 1px solid rgba(37, 99, 235, 0.15);
}

.profile-logout-btn {
  width: 100%;
  margin-top: 4px;
}

/* Compact layout styling overrides for small screens */
@media (max-width: 480px) {
  .profile-dropdown-btn span {
    max-width: 75px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .profile-dropdown-btn {
    padding: 8px 12px;
    gap: 4px;
  }
}

/* Help & Support Page & Ticket Listing Styles */
.support-container {
  padding: 20px 0;
}

.support-card {
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
}

.ticket-card {
  display: flex;
  flex-direction: column;
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 16px;
  transition: var(--transition);
  position: relative;
}

.ticket-card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(30, 86, 160, 0.2);
}

.ticket-card.status-pending {
  border-left: 5px solid var(--warning);
}

.ticket-card.status-resolved {
  border-left: 5px solid var(--success);
}

.ticket-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 12px;
  border-bottom: 1px dashed var(--border-color);
  padding-bottom: 12px;
  margin-bottom: 14px;
}

.ticket-user-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ticket-user-meta {
  font-size: 13px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.ticket-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 12px;
  text-transform: uppercase;
}

.status-badge-pending {
  background-color: #fef3c7;
  color: #b45309;
  border: 1px solid #fde68a;
}

.status-badge-resolved {
  background-color: #dcfce7;
  color: #15803d;
  border: 1px solid #86efac;
}

.ticket-subject {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary-dark);
  margin-bottom: 8px;
}

.ticket-message {
  font-size: 14px;
  color: var(--text-main);
  background-color: rgba(243, 248, 255, 0.3);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(30, 86, 160, 0.05);
  line-height: 1.5;
  white-space: pre-wrap;
}

.ticket-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
}

@media (max-width: 600px) {
  .form-group-grid {
    grid-template-columns: 1fr !important;
    gap: 16px !important;
  }
}

/* Announcements scrolling block */
#announcements-list-container {
  max-height: 380px;
  overflow-y: auto;
  padding-right: 8px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Heart Likes button style */
.like-heart-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
  background: rgba(255, 255, 255, 0.95) !important;
  border: 1px solid var(--border-color) !important;
  padding: 6px 10px !important;
  border-radius: 20px !important;
  font-size: 12px !important;
  font-weight: 700 !important;
  cursor: pointer !important;
  color: var(--text-muted) !important;
  box-shadow: var(--shadow-sm) !important;
  transition: all 0.2s ease !important;
  z-index: 10;
}

.like-heart-btn:hover {
  transform: scale(1.08) !important;
  color: var(--danger) !important;
  border-color: rgba(239, 68, 68, 0.3) !important;
  background-color: #fff5f5 !important;
}

.like-heart-btn.liked {
  color: var(--danger) !important;
  background-color: #fff5f5 !important;
  border-color: rgba(239, 68, 68, 0.3) !important;
}

/* Adjust document card layout on desktop to avoid overlap with the heart button */
@media (min-width: 769px) {
  .doc-card {
    padding-right: 80px !important;
  }
}

/* Floating Contribute Button */
.btn-floating-contribute {
  position: fixed;
  bottom: 30px;
  left: 30px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--primary);
  color: var(--white);
  border: none;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  animation: pulse-light 2s infinite;
}

.btn-floating-contribute:hover {
  background-color: var(--primary-dark);
  transform: scale(1.1) rotate(90deg);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.6);
}

.btn-floating-contribute i {
  width: 24px;
  height: 24px;
}

/* Floating SONIC Chatbot Button */
.btn-floating-sonic {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background-color: var(--primary);
  color: var(--white);
  border: none;
  box-shadow: 0 4px 15px rgba(37, 99, 235, 0.4);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  animation: pulse-light 2s infinite;
}

.btn-floating-sonic:hover {
  background-color: var(--primary-dark);
  transform: scale(1.1);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.6);
}

.btn-floating-sonic i {
  width: 24px;
  height: 24px;
}

@keyframes pulse-light {
  0% {
    box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.4);
  }
  70% {
    box-shadow: 0 0 0 15px rgba(37, 99, 235, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(37, 99, 235, 0);
  }
}

@media (max-width: 480px) {
  .btn-floating-contribute {
    bottom: 20px;
    left: 20px;
    width: 48px;
    height: 48px;
  }
  .btn-floating-sonic {
    bottom: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
  }
}

/* Admin Pending Contributions */
.pending-doc-card {
  border-left: 4px solid var(--warning) !important;
}

.pending-doc-actions {
  display: flex;
  gap: 8px;
}

@media (max-width: 768px) {
  .doc-card.pending-doc-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  .pending-doc-actions {
    width: 100%;
    justify-content: flex-end;
  }
}

/* File Tool Generators Styles */
.generators-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 30px;
  align-items: start;
  margin-top: 20px;
}

.a4-preview-sheet {
  width: 100%;
  aspect-ratio: 210 / 297;
  background: white;
  position: relative;
  box-sizing: border-box;
  overflow: hidden;
  color: black;
  font-family: 'Times New Roman', Times, serif;
  transform-origin: top center;
  box-shadow: inset 0 0 10px rgba(0,0,0,0.05);
  container-type: inline-size;
}

.idx-row-input-group {
  display: grid;
  grid-template-columns: 30px 2.5fr 1fr 1.4fr 1.2fr 40px;
  gap: 8px;
  align-items: center;
  background: rgba(0, 0, 0, 0.015);
  padding: 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.idx-row-input-group input {
  padding: 6px 8px !important;
  font-size: 12px !important;
  height: 32px !important;
}

.tab-btn {
  transition: all 0.2s ease;
}
.tab-btn.active {
  background: var(--primary) !important;
  color: var(--white) !important;
}

/* Emblem/Emblems and borders inside the A4 Preview Sheet using Container Query Units */
.preview-classic-border {
  border: 0.6cqw double #000;
  height: calc(100% - 9.52cqw);
  margin: 4.76cqw;
  padding: 4cqw;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
}

.preview-modern-accent {
  border: 0.2cqw solid var(--primary);
  height: calc(100% - 9.52cqw);
  margin: 4.76cqw;
  padding: 4.8cqw;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
}

.preview-tech-border {
  height: calc(100% - 9.52cqw);
  margin: 4.76cqw;
  padding: 4cqw;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  border: 0.2cqw solid #000;
  position: relative;
}

.preview-tech-border::before {
  content: '';
  position: absolute;
  top: 0.95cqw;
  left: 0.95cqw;
  right: 0.95cqw;
  bottom: 0.95cqw;
  border: 0.2cqw dashed rgba(0,0,0,0.15);
  pointer-events: none;
}

@media (max-width: 1024px) {
  .generators-layout {
    grid-template-columns: 1fr;
  }
}

/* Print Styling for SONIC Chatbot */
@media print {
  body * {
    visibility: hidden;
  }
  #view-sonic, #view-sonic * {
    visibility: visible;
  }
  #view-sonic {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    margin: 0;
    padding: 0;
    background: white !important;
    box-shadow: none !important;
  }
  #view-sonic .chatbot-container {
    max-width: 100% !important;
    width: 100% !important;
    height: auto !important;
    padding: 0 !important;
    margin: 0 !important;
  }
  #view-sonic .card {
    box-shadow: none !important;
    border: none !important;
    height: auto !important;
    overflow: visible !important;
    background: transparent !important;
  }
  #sonic-messages {
    overflow-y: visible !important;
    height: auto !important;
    background: white !important;
    padding: 0 !important;
    display: flex !important;
    flex-direction: column !important;
  }
  #btn-print-chat, #form-sonic-chat, #sonic-typing, .navbar, .mobile-nav-menu, .mobile-nav-overlay, .footer {
    display: none !important;
  }
  .message-bubble {
    box-shadow: none !important;
    border: 1px solid #e2e8f0 !important;
    margin-bottom: 12px !important;
    page-break-inside: avoid !important;
    border-radius: 12px !important;
  }
}

/* SONIC Message Bubble Animations */
@keyframes sonic-bubble-in {
  0% {
    opacity: 0;
    transform: translateY(12px) scale(0.97);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.message-bubble {
  animation: sonic-bubble-in 0.3s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

/* Typing Indicator Animation */
#sonic-typing {
  animation: sonic-bubble-in 0.3s cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

/* Logo styling for Classic UI */
.logo-image {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  object-fit: cover;
}

/* --- SITE ADVERTISEMENT SPACE --- */
.site-ad-space {
  width: min(100%, 970px);
  min-height: 120px;
  display: none;
  align-items: center;
  justify-content: center;
  margin: 48px auto 0;
  padding: 18px;
  border: 1px dashed var(--primary-light) !important;
  border-radius: var(--radius);
  background: var(--primary-accent) !important;
  box-shadow: var(--shadow-sm);
  box-sizing: border-box;
}

.site-ad-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  color: var(--primary);
  text-align: center;
}

.site-ad-placeholder svg {
  width: 22px;
  height: 22px;
  color: var(--primary-light);
}

.site-ad-placeholder strong {
  color: var(--primary-dark);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-ad-placeholder span {
  color: var(--text-muted);
  font-size: 11px;
}

/* Document Actions Dropdown */
.more-options-dropdown {
  display: none;
  position: absolute;
  right: 0;
  bottom: 100%;
  margin-bottom: 8px;
  background: var(--card-bg) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: var(--radius-sm) !important;
  box-shadow: var(--shadow-md) !important;
  z-index: 100;
  min-width: 130px;
  padding: 4px 0;
}
.dropdown-item {
  width: 100%;
  text-align: left;
  padding: 8px 12px;
  background: none;
  border: none;
  font-size: 13px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  transition: background-color 0.2s ease;
}
.dropdown-item:hover {
  background-color: var(--primary-accent) !important;
  color: var(--primary-dark) !important;
}

/* Mobile App Responsiveness Enhancements */
html, body, button, a, input, select, textarea {
  touch-action: manipulation;
}
body {
  max-width: 100%;
}
.app-container {
  overflow-x: hidden;
  max-width: 100%;
}

@media (max-width: 768px) {
  /* Prevent horizontal scroll on document actions and wrap properly */
  .doc-actions {
    display: flex !important;
    flex-direction: row !important;
    flex-wrap: nowrap !important;
    align-items: center !important;
    justify-content: space-between !important;
    width: 100% !important;
    gap: 8px !important;
  }
  .doc-actions > a.btn {
    flex: 1 !important;
    justify-content: center !important;
    padding: 8px 6px !important;
    font-size: 12px !important;
  }
  .more-options-container {
    flex-shrink: 0 !important;
  }

  /* Make user cards and actions highly responsive */
  .user-card {
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 12px !important;
  }
  .user-actions {
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 8px !important;
    justify-content: flex-start !important;
    align-items: center !important;
  }
  .user-actions button:not(.btn-delete-user), 
  .user-actions a, 
  .user-actions span:not(.user-tag) {
    margin-right: 0 !important;
    flex: 1 1 calc(50% - 8px) !important;
    justify-content: center !important;
  }
  .user-actions .btn-delete-user {
    margin-right: 0 !important;
    flex-grow: 0 !important;
    flex-shrink: 0 !important;
    width: 38px !important;
    height: 38px !important;
    border-radius: 50% !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 0 !important;
    margin-left: auto !important;
  }

  .calculator-tabs {
    gap: 8px !important;
    overflow-x: auto !important;
    flex-wrap: nowrap !important;
    scrollbar-width: none !important;
    padding-bottom: 8px !important;
  }
  .calculator-tabs::-webkit-scrollbar {
    display: none !important;
  }
  .calculator-tabs > * {
    flex: 0 0 auto !important;
    padding: 8px 16px !important;
    font-size: 14px !important;
    white-space: nowrap !important;
    overflow: visible !important;
    text-overflow: clip !important;
  }

  .search-btn-text {
    display: none !important;
  }
  .search-btn-icon {
    display: block !important;
  }
  #btn-admin-user-search {
    padding: 10px 14px !important;
  }

  /* Adjust Modal padding on small screens */
  .modal-content {
    padding: 20px !important;
    width: 95% !important;
  }
}

@media (max-width: 480px) {
  /* Headers and page spacing */
  .page-container {
    padding: 16px 12px !important;
  }
  
  .section-title {
    font-size: 18px !important;
  }

  .folder-page-header h3 {
    font-size: 18px !important;
  }

  /* Login / Signup styling robustness */
  .auth-card {
    padding: 24px 16px !important;
  }

  .auth-card.card {
    border-radius: 20px !important;
    transform: none !important; /* No 3D tilt on touch screens */
  }
}

/* Fixed Bottom Navigation Bar for Mobile */
/* Hill Hump Styling for the Mobile Bottom Nav */
.mobile-bottom-nav {
  position: fixed !important;
  bottom: 20px !important; /* Floats above bottom with 20px margin */
  left: 20px !important;
  right: 20px !important;
  width: calc(100% - 40px) !important;
  max-width: 480px !important;
  margin-inline: auto !important;
  height: 64px !important;
  z-index: 990 !important;
  touch-action: pan-y !important;
  -webkit-tap-highlight-color: transparent !important;
  isolation: isolate !important;
  display: none;
  background: #ffffff !important;
  border-radius: 18px !important;
  
  /* Geometry fallback */
  --dock-r: 18px;
  --bead-d: 46px;
  --bead-cy: 0px;
  --rise: 14px; /* The height the icon rises when active inside the bead */
  
  /* Colors */
  --bar: #ffffff;
  --bar-hi: #ffffff;
  --bar-lo: #fcfcfc;
  --icon-off: #64748b;
  --icon-on: #ffffff;
  --glow-rgb: 30 86 160; /* StudyHub blue */
  --glow: rgb(var(--glow-rgb));
  --acc: var(--primary);
}

.js .mobile-bottom-nav {
  background: none !important;
}

/* Ambient ground shadow */
.dock__cast {
  position: absolute !important;
  inset: 46% 7% 6% 7% !important;
  border-radius: 999px !important;
  background: rgba(0, 0, 0, 0.08) !important;
  box-shadow:
    0 10px 22px -8px rgba(0, 0, 0, 0.12),
    0 24px 44px -16px rgba(0, 0, 0, 0.16) !important;
}

.dock__skin {
  position: absolute !important;
  inset: 0 !important;
  width: 100% !important;
  height: 100% !important;
  overflow: visible !important;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.06)) !important;
}

.dock__fill {
  fill: url(#mnPlate) !important;
  stroke: rgba(0, 0, 0, 0.05) !important;
  stroke-width: 1px !important;
}

.dock__plate-hi { stop-color: var(--bar-hi) !important; }
.dock__plate-lo { stop-color: var(--bar-lo) !important; }

/* Specular top light for 3D feel */
.dock__rim-hi { stop-color: rgba(0, 0, 0, 0.03) !important; }
.dock__rim-lo { stop-color: rgba(0, 0, 0, 0.01) !important; }

/* The Active Liquid Bead */
.dock__bead {
  position: absolute !important;
  top: var(--bead-cy) !important;
  left: 0 !important;
  width: var(--bead-d) !important;
  height: var(--bead-d) !important;
  margin: calc(var(--bead-d) / -2) 0 0 calc(var(--bead-d) / -2) !important;
  border-radius: 50% !important;
  background: var(--primary) !important; /* solid blue circle highlight */
  box-shadow:
    0 0 0 1px rgba(30, 86, 160, 0.15),
    0 6px 16px rgba(30, 86, 160, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.25) !important;
  will-change: transform;
  pointer-events: none !important;
  z-index: 2 !important;
}

.mobile-bottom-nav:not(.is-ready) .dock__bead {
  opacity: 0 !important;
}

/* Tabs & items */
.mobile-bottom-nav-item {
  position: relative !important;
  flex: 1 !important;
  display: block !important;
  height: 100% !important;
  padding: 0 !important;
  border: 0 !important;
  background: none !important;
  cursor: pointer !important;
  text-decoration: none !important;
  --t: 0;
}

.tab__icon {
  position: absolute !important;
  left: 50% !important;
  top: 50% !important;
  width: 22px !important;
  height: 22px !important;
  fill: none !important;
  stroke: currentColor !important;
  stroke-width: 2.2px !important;
  stroke-linecap: round !important;
  stroke-linejoin: round !important;
  color: color-mix(in oklab, var(--icon-off) calc((1 - var(--t)) * 100%), var(--icon-on)) !important;
  transform: translate(-50%, -50%) translateY(calc(var(--t) * var(--rise) * -1)) !important;
  will-change: transform;
  z-index: 10 !important;
}

.tab__label {
  position: absolute !important;
  left: 0 !important;
  right: 0 !important;
  bottom: 14px !important;
  font-size: 10px !important;
  font-weight: 600 !important;
  text-align: center !important;
  color: var(--primary) !important; /* blue active label color */
  opacity: 0 !important;
  transform: translateY(calc((1 - var(--t)) * 7px)) !important;
  pointer-events: none !important;
  white-space: nowrap !important;
  transition: opacity 0.3s ease, transform 0.3s ease !important;
}

.mobile-bottom-nav-item[aria-selected="true"] .tab__label,
.mobile-bottom-nav.is-dragging .tab__label {
  opacity: var(--t) !important;
  transform: translateY(calc((1 - var(--t)) * 4px)) !important;
}

/* Mobile Top App Bar (Fixed/Stationary) */
.mobile-top-bar {
  position: fixed !important;
  top: 0 !important;
  left: 0 !important;
  right: 0 !important;
  height: auto !important;
  background: var(--white) !important;
  border-bottom: 1px solid var(--border-color) !important;
  display: none;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px !important;
  z-index: 1010 !important;
  box-shadow: var(--shadow-sm);
}

.mobile-logo {
  margin-left: 4px !important;
}

.mobile-logo .logo-image {
  margin-right: 12px !important;
  width: 32px !important;
  height: 32px !important;
}

.mobile-logo span {
  font-size: 18px !important;
  margin-left: 2px !important;
}

/* Hide duplicate page title name on mobile header */
#mobile-page-title {
  display: none !important;
}

/* Profile View Styling */
.profile-hero-card {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 10px 25px -5px rgba(30, 86, 160, 0.25);
  position: relative;
  overflow: hidden;
  color: var(--white);
}

.profile-menu-section {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.profile-menu-section-header {
  padding: 14px 16px 8px 16px;
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--primary-accent);
}

.profile-menu-items {
  display: flex;
  flex-direction: column;
}

.profile-menu-section.collapsed .profile-menu-items {
  display: none;
}

.profile-menu-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  text-decoration: none;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
  transition: background-color 0.2s ease;
  font-size: 14px;
  font-weight: 600;
}

.profile-menu-item:last-child {
  border-bottom: none;
}

.profile-menu-item:hover,
.profile-menu-item:active {
  background-color: var(--primary-accent);
}

.profile-menu-item .item-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.profile-menu-item .item-left i,
.profile-menu-item .item-left svg {
  width: 18px;
  height: 18px;
  color: var(--primary);
}

.profile-menu-item .arrow-right {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  opacity: 0.7;
}

@media (max-width: 768px) {
  /* Switch navigation layout */
  .navbar {
    display: none !important;
  }
  .ui-switcher-bar {
    display: none !important;
  }
  .mobile-top-bar {
    display: flex !important;
  }
  .mobile-bottom-nav {
    display: flex !important;
  }
  
  /* Reset top main content padding exactly to top bar height & reserve bottom padding for bottom nav */
  .main-content {
    padding-top: 64px !important;
    padding-bottom: 120px !important;
  }

  /* Remove blank spacing gaps above layout containers */
  .home-container,
  .page-container,
  .auth-container,
  .profile-container,
  .folder-page-header,
  .hero {
    margin-top: 0 !important;
    padding-top: 12px !important;
  }
  
  .hero {
    padding: 16px !important;
  }

  /* Place floating buttons perfectly above the bottom floating navbar */
  .btn-floating-contribute {
    bottom: 96px !important;
    left: 20px !important;
  }
  .btn-floating-sonic {
    bottom: 96px !important;
    right: 20px !important;
  }
}

/* Mobile Theme Toggle overrides */
.profile-menu-item .ui-toggle-slider {
  background-color: #cbd5e1 !important;
  border-color: #94a3b8 !important;
}
.profile-menu-item input:checked + .ui-toggle-slider {
  background-color: var(--primary) !important;
  border-color: var(--primary) !important;
}
.profile-menu-item .ui-toggle-slider:before {
  background-color: white !important;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15) !important;
  bottom: 3px !important;
  left: 3px !important;
}
.profile-menu-item input:checked + .ui-toggle-slider:before {
  transform: translateX(20px) !important;
}

/* App Font Family Inheritance */
body, input, select, textarea, button {
  font-family: var(--app-font-family, 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif) !important;
}


/* Font Style Cards */
.font-style-card {
  background: var(--white);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.font-style-card:hover {
  border-color: var(--primary);
  transform: translateY(-1px);
}
.font-style-card.active {
  border-color: var(--primary);
  background: var(--primary-accent);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb, 79, 70, 229), 0.15);
}

/* Desktop Specific Layout Structure & Alignments */
@media (min-width: 769px) {
  .mobile-top-bar,
  .mobile-bottom-nav {
    display: none !important;
  }
  .navbar {
    display: flex !important;
    position: fixed !important;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 1000;
  }
  .ui-switcher-bar {
    display: flex !important;
  }
  .main-content {
    padding-top: 134px !important;
    padding-bottom: 60px !important;
    min-height: calc(100vh - 120px);
  }
  .home-container,
  .page-container,
  .auth-container,
  .profile-container,
  .folder-page-header,
  .admin-container {
    max-width: 1200px !important;
    margin: 0 auto !important;
    width: 100% !important;
    padding-left: 24px !important;
    padding-right: 24px !important;
  }
  .hero {
    display: grid !important;
    grid-template-columns: 1.2fr 0.8fr !important;
    gap: 40px !important;
    align-items: center !important;
    margin-bottom: 40px !important;
    padding: 36px 32px !important;
  }
  .btn-floating-contribute {
    bottom: 30px !important;
    left: 30px !important;
  }
  .btn-floating-sonic {
    bottom: 30px !important;
    right: 30px !important;
  }
}

/* Footer hidden by default (mobile) */
.desktop-footer {
  display: none !important;
}

@media (min-width: 769px) {
  .desktop-footer {
    display: flex !important;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #ffffff;
    padding: 48px 24px;
    text-align: center;
    gap: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  .desktop-footer .footer-brand {
    font-size: 24px;
    font-weight: 700;
    margin: 0;
    letter-spacing: 0.5px;
  }
  
  .desktop-footer .footer-tagline {
    font-size: 15px;
    opacity: 0.9;
    margin: 0;
  }
  
  .desktop-footer .footer-connect {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
    opacity: 0.95;
  }
  
  .desktop-footer .footer-connect a {
    color: #ffffff;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
  }
  
  .desktop-footer .footer-connect a:hover {
    text-decoration: underline;
  }
  
  .desktop-footer .footer-copyright {
    font-size: 13px;
    opacity: 0.8;
    margin: 4px 0;
  }
  
  .desktop-footer .footer-links {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-top: 8px;
  }
  
  .desktop-footer .footer-links a {
    color: #ffffff;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    opacity: 0.9;
  }
  
  .desktop-footer .footer-links a:hover {
    opacity: 1;
    text-decoration: underline;
  }
  
  .desktop-footer .footer-divider {
    opacity: 0.5;
    font-size: 14px;
  }
}

/* ============================================================
   DESKTOP SCROLL BOTTOM DOCK — shown via anime.js when user scrolls
   ============================================================ */
@media (min-width: 769px) {
  .mobile-bottom-nav.desktop-scrolled-show {
    --rise: 0px !important;
    --t: 0 !important;
    display: flex !important;
    position: fixed !important;
    bottom: 26px !important;
    left: 20px !important;
    right: 20px !important;
    margin: 0 auto !important;
    width: calc(100% - 40px) !important;
    max-width: 580px !important;
    height: 74px !important;
    padding: 6px 14px !important;
    z-index: 990 !important;
    background: rgba(255, 255, 255, 0.96) !important;
    backdrop-filter: blur(24px) saturate(180%) !important;
    -webkit-backdrop-filter: blur(24px) saturate(180%) !important;
    border-radius: 24px !important;
    box-shadow: 
      0 20px 48px -10px rgba(15, 23, 42, 0.22),
      0 10px 24px -6px rgba(15, 23, 42, 0.12),
      0 0 0 1px rgba(0, 0, 0, 0.06),
      0 2px 6px rgba(0, 0, 0, 0.04) !important;
    border: 1px solid rgba(255, 255, 255, 0.9) !important;
    align-items: center !important;
    justify-content: space-evenly !important;
    pointer-events: auto !important;
    visibility: visible !important;
    opacity: 1 !important;
    touch-action: auto !important;
    gap: 6px !important;
    box-sizing: border-box !important;
  }

  .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item {
    position: relative !important;
    display: flex !important;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    flex: 1 !important;
    height: 100% !important;
    min-width: 72px !important;
    text-decoration: none !important;
    cursor: pointer !important;
    padding: 6px 12px !important;
    border-radius: 16px !important;
    z-index: 2 !important;
    transition: all 0.22s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
    gap: 3px !important;
    background: transparent !important;
    border: 1px solid transparent !important;
    box-sizing: border-box !important;
  }

  .mobile-bottom-nav.desktop-scrolled-show .tab__icon {
    position: static !important;
    transform: none !important;
    left: auto !important;
    top: auto !important;
    width: 24px !important;
    height: 24px !important;
    color: #64748b !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    transition: all 0.22s cubic-bezier(0.34, 1.56, 0.64, 1) !important;
    opacity: 1 !important;
    margin: 0 auto !important;
  }

  .mobile-bottom-nav.desktop-scrolled-show .tab__icon svg {
    width: 22px !important;
    height: 22px !important;
  }

  .mobile-bottom-nav.desktop-scrolled-show .tab__label {
    position: static !important;
    transform: none !important;
    left: auto !important;
    right: auto !important;
    bottom: auto !important;
    font-size: 12px !important;
    font-weight: 600 !important;
    letter-spacing: 0.2px !important;
    color: #64748b !important;
    margin-top: 0 !important;
    opacity: 1 !important;
    display: block !important;
    transition: all 0.22s ease !important;
    text-align: center !important;
    line-height: 1.2 !important;
  }

  /* Hover state on tabs */
  .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item:hover {
    background: var(--primary-accent, rgba(79, 70, 229, 0.08)) !important;
    transform: translateY(-2px) !important;
  }

  .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item:hover .tab__icon {
    color: var(--primary, #4f46e5) !important;
    transform: scale(1.1) !important;
  }

  .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item:hover .tab__label {
    color: var(--primary, #4f46e5) !important;
  }

  /* Active / Selected Tab State - highlighted pill */
  .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item[aria-selected="true"],
  .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item.active {
    background: var(--primary-accent, rgba(79, 70, 229, 0.12)) !important;
    border: 1px solid rgba(79, 70, 229, 0.2) !important;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.12) !important;
  }

  .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item[aria-selected="true"] .tab__icon,
  .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item.active .tab__icon {
    color: var(--primary, #4f46e5) !important;
    transform: scale(1.12) !important;
  }

  .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item[aria-selected="true"] .tab__label,
  .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item.active .tab__label {
    color: var(--primary, #4f46e5) !important;
    font-weight: 700 !important;
  }

  .mobile-bottom-nav.desktop-scrolled-show .dock__skin,
  .mobile-bottom-nav.desktop-scrolled-show .dock__bead,
  .mobile-bottom-nav.desktop-scrolled-show .dock__cast {
    display: none !important;
  }

  .navbar.scrolled {
    background: rgba(255, 255, 255, 0.94) !important;
    backdrop-filter: blur(20px) saturate(180%) !important;
    -webkit-backdrop-filter: blur(20px) saturate(180%) !important;
    border: 1px solid rgba(226, 232, 240, 0.9) !important;
    box-shadow: 0 16px 36px -6px rgba(15, 23, 42, 0.12), 0 0 0 1px rgba(0, 0, 0, 0.04) !important;
  }

  .navbar.scrolled #desktop-nav-links {
    pointer-events: none !important;
  }
}

/* ==========================================================================
   AESTHETIC GLASSMORPHIC 3D DARK MODE & THEME CONTROLS
   ========================================================================== */

/* --- UI SWITCHER BAR --- */
.ui-switcher-bar {
  position: fixed;
  left: 24px;
  right: 24px;
  margin: 0 auto;
  width: calc(100% - 48px);
  max-width: 1320px;
  height: 44px;
  border-radius: 9999px;
  padding: 0 28px;
  box-sizing: border-box;
  z-index: 990;
  top: 88px;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid rgba(226, 232, 240, 0.9);
  box-shadow: 0 10px 28px -6px rgba(15, 23, 42, 0.08), 0 0 0 1px rgba(0, 0, 0, 0.03);
  transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.ui-switcher-content {
  width: 100%;
  max-width: 100%;
  height: 100%;
  padding: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
}

.ui-switcher-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-main);
  font-weight: 600;
  letter-spacing: 0.1px;
}

.ui-switcher-icon {
  width: 16px;
  height: 16px;
  color: var(--primary);
}

.ui-toggle-control {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ui-toggle-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-muted);
  transition: color 0.25s ease, transform 0.25s ease;
  user-select: none;
}

.ui-toggle-switch {
  position: relative;
  display: inline-block;
  width: 46px;
  height: 24px;
  cursor: pointer;
}

.ui-toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.ui-toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #cbd5e1;
  border-radius: 34px;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.12);
}

.ui-toggle-slider:before {
  position: absolute;
  content: "";
  height: 18px;
  width: 18px;
  left: 3px;
  bottom: 3px;
  background-color: white;
  border-radius: 50%;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
}

.ui-toggle-switch input:checked + .ui-toggle-slider {
  background: linear-gradient(135deg, var(--primary) 0%, #8b5cf6 100%);
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.25), 0 0 12px var(--primary-glow);
}

.ui-toggle-switch input:checked + .ui-toggle-slider:before {
  transform: translateX(22px);
  background-color: #ffffff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
}

/* --- DARK THEME ROOT VARIABLES --- */
[data-theme="dark"] {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --primary-light: #93c5fd;
  --primary-accent: rgba(59, 130, 246, 0.2);
  --primary-glow: rgba(59, 130, 246, 0.55);
  --primary-rgb: 59, 130, 246;
  --bg-gradient: radial-gradient(ellipse at 50% -10%, #10214a 0%, #0a142c 45%, #040711 100%);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --white: #0c1427;
  --card-bg: rgba(16, 25, 48, 0.86);
  --glass-bg: rgba(20, 31, 58, 0.75);
  --border-color: rgba(255, 255, 255, 0.11);
  --glass-border: 1px solid rgba(255, 255, 255, 0.14);
  --specular-highlight: inset 0 1px 0 rgba(255, 255, 255, 0.16);
  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.06);
  --shadow-md: 0 10px 24px -4px rgba(0, 0, 0, 0.55), 0 0 18px rgba(37, 99, 235, 0.22), 0 0 0 1px rgba(255, 255, 255, 0.09);
  --shadow-lg: 0 20px 42px -8px rgba(0, 0, 0, 0.75), 0 0 32px rgba(37, 99, 235, 0.3), 0 0 0 1px rgba(255, 255, 255, 0.14);
  --shadow-active: 0 0 0 3px rgba(59, 130, 246, 0.45);
}

/* GPU Accelerated Dark Mode Base & Cosmic Background Layer */
[data-theme="dark"],
[data-theme="dark"] body,
html[data-theme="dark"] body,
body[data-theme="dark"] {
  background-color: #050914 !important;
  background-image: none !important;
  color: #f8fafc !important;
}

[data-theme="dark"] body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: radial-gradient(ellipse at 50% -10%, #10214a 0%, #0a142c 45%, #040711 100%);
  z-index: -10;
  pointer-events: none;
  transform: translateZ(0);
}

/* Floating Ambient Aurora Glow Mesh (Pure GPU Animation) */
[data-theme="dark"] body::after {
  content: '';
  position: fixed;
  top: -10%;
  right: -5%;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.22) 0%, rgba(59, 130, 246, 0.1) 45%, transparent 70%);
  filter: blur(60px);
  z-index: -9;
  pointer-events: none;
  animation: auroraFloat 16s ease-in-out infinite alternate;
  transform: translateZ(0);
  will-change: transform;
}

@keyframes auroraFloat {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 0.6;
  }
  50% {
    transform: translate(-50px, 60px) scale(1.12);
    opacity: 0.9;
  }
  100% {
    transform: translate(30px, 30px) scale(0.96);
    opacity: 0.65;
  }
}

/* Glowing Neon Hero Title Animation */
[data-theme="dark"] .hero-content h1 span {
  background: linear-gradient(135deg, #60a5fa 0%, #93c5fd 50%, #38bdf8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
  animation: neonPulse 4s ease-in-out infinite alternate;
}

@keyframes neonPulse {
  0% {
    filter: drop-shadow(0 0 12px rgba(96, 165, 250, 0.5));
  }
  100% {
    filter: drop-shadow(0 0 28px rgba(96, 165, 250, 0.85)) drop-shadow(0 0 45px rgba(37, 99, 235, 0.4));
  }
}

[data-theme="dark"] .calc-tab,
[data-theme="dark"] .semester-btn,
[data-theme="dark"] .branch-btn {
  background: rgba(20, 31, 58, 0.75) !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  color: #94a3b8 !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.08) !important;
  transform: translateZ(0);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1) !important;
}

[data-theme="dark"] .calc-tab:hover,
[data-theme="dark"] .semester-btn:hover,
[data-theme="dark"] .branch-btn:hover {
  background: rgba(30, 48, 86, 0.95) !important;
  color: #ffffff !important;
  border-color: rgba(96, 165, 250, 0.5) !important;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.28) !important;
  transform: translateY(-2px) translateZ(0) !important;
}

[data-theme="dark"] .calc-tab.active,
[data-theme="dark"] .semester-btn.active,
[data-theme="dark"] .branch-btn.active {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%) !important;
  color: #ffffff !important;
  border-color: rgba(147, 197, 253, 0.55) !important;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.35) !important;
  transform: translateY(-1px) translateZ(0) !important;
}

/* Super-Smooth Hardware-Accelerated Glass Cards */
[data-theme="dark"] .card,
[data-theme="dark"] .why-card,
[data-theme="dark"] .announcement-card,
[data-theme="dark"] .doc-card,
[data-theme="dark"] .site-stats-card,
[data-theme="dark"] .font-style-card,
[data-theme="dark"] .resource-action-card,
[data-theme="dark"] .paper-year-card {
  background: rgba(16, 25, 48, 0.86) !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
  box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
  transform: translateZ(0);
  will-change: transform, box-shadow;
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.22s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.22s ease !important;
}

/* Dark mode Real 3D Book */
[data-theme="dark"] .auth-scene {
  background: radial-gradient(ellipse at 50% 25%, #08142c 0%, #040a17 50%, #02050b 100%) !important;
}

[data-theme="dark"] .real-book-casing {
  background: linear-gradient(145deg, #030814 0%, #0a1936 40%, #0f244c 75%, #020612 100%) !important;
  box-shadow:
    0 45px 95px -18px rgba(0, 0, 0, 0.9),
    0 25px 45px -12px rgba(0, 0, 0, 0.7),
    0 0 0 2px rgba(212, 175, 55, 0.35),
    inset 0 0 0 2px rgba(255, 255, 255, 0.08),
    inset 0 3px 6px rgba(255, 255, 255, 0.12) !important;
}

[data-theme="dark"] .book-pages-container {
  background: #08101f !important;
}

[data-theme="dark"] .book-page-left {
  background: linear-gradient(135deg, #0c172d 0%, #0f1e3a 50%, #0a1326 100%) !important;
  box-shadow:
    -3px 3px 0 #13223f,
    -6px 6px 0 #0e1a33,
    -9px 9px 0 #0a1326,
    -12px 12px 0 #060d1b,
    -16px 16px 25px rgba(0, 0, 0, 0.6),
    inset -28px 0 35px -12px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
}

[data-theme="dark"] .book-page-right {
  background: linear-gradient(225deg, #0c172d 0%, #0f1e3a 50%, #0a1326 100%) !important;
  box-shadow:
    3px 3px 0 #13223f,
    6px 6px 0 #0e1a33,
    9px 9px 0 #0a1326,
    12px 12px 0 #060d1b,
    16px 16px 25px rgba(0, 0, 0, 0.6),
    inset 28px 0 35px -12px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
}

[data-theme="dark"] .leaf-face {
  background: linear-gradient(225deg, #0c172d 0%, #0f1e3a 50%, #0a1326 100%) !important;
  box-shadow:
    inset 24px 0 35px -12px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
}

[data-theme="dark"] .leaf-face-back {
  background: linear-gradient(135deg, #0a1326 0%, #0f1e3a 50%, #0c172d 100%) !important;
  box-shadow:
    inset -24px 0 35px -12px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
}

[data-theme="dark"] .book-title {
  color: #93c5fd !important;
}

[data-theme="dark"] .book-edition {
  color: #94a3b8 !important;
}

[data-theme="dark"] .book-desc {
  color: #cbd5e1 !important;
}

[data-theme="dark"] .book-features-list {
  background: rgba(15, 23, 42, 0.6) !important;
  border-color: rgba(212, 175, 55, 0.2) !important;
}

[data-theme="dark"] .book-feature-item {
  color: #f1f5f9 !important;
}

[data-theme="dark"] .book-page-header {
  border-bottom-color: rgba(212, 175, 55, 0.25) !important;
  color: #fbbf24 !important;
}

[data-theme="dark"] .book-header-badge {
  background: rgba(245, 158, 11, 0.15) !important;
  color: #fbbf24 !important;
}

[data-theme="dark"] .book-page-footer {
  border-top-color: rgba(212, 175, 55, 0.2) !important;
  color: #fbbf24 !important;
}

[data-theme="dark"] .book-form-header h2 {
  color: #f8fafc !important;
}

[data-theme="dark"] .book-form-header p {
  color: #94a3b8 !important;
}

[data-theme="dark"] .book-page-right .form-label {
  color: #e2e8f0 !important;
}

[data-theme="dark"] .book-page-right .form-input {
  background: rgba(8, 14, 30, 0.9) !important;
  border-color: rgba(59, 130, 246, 0.28) !important;
  color: #f8fafc !important;
}

[data-theme="dark"] .book-page-right .form-input:focus {
  background: rgba(11, 20, 42, 0.98) !important;
  border-color: #60a5fa !important;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.35) !important;
}

[data-theme="dark"] .corner-page-curl {
  background: linear-gradient(135deg, transparent 50%, #0e1a33 50%, #17284d 75%, #243c72 100%) !important;
}

[data-theme="dark"] .auth-bubble {
  background: radial-gradient(circle at 35% 35%,
    rgba(255,255,255,0.12) 0%,
    rgba(59,130,246,0.3) 55%,
    rgba(29,78,216,0.1) 100%) !important;
  border-color: rgba(96, 165, 250, 0.3) !important;
}

[data-theme="dark"] .auth-sparkle {
  background: rgba(96, 165, 250, 0.7) !important;
}

/* legacy dark auth card (used by forgot-password) */
[data-theme="dark"] .auth-card.card {
  background: rgba(10, 18, 38, 0.88) !important;
  backdrop-filter: blur(28px) saturate(200%) !important;
  -webkit-backdrop-filter: blur(28px) saturate(200%) !important;
  border: 1px solid rgba(59, 130, 246, 0.28) !important;
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.14),
    0 36px 72px -12px rgba(0, 0, 0, 0.85),
    0 0 40px rgba(37, 99, 235, 0.28),
    0 0 0 1px rgba(255, 255, 255, 0.06) !important;
}

[data-theme="dark"] .auth-header h2 { color: #f8fafc !important; }

[data-theme="dark"] .auth-card .form-input {
  background: rgba(13, 20, 40, 0.8) !important;
  border: 1.5px solid rgba(59, 130, 246, 0.25) !important;
  color: #f8fafc !important;
}

[data-theme="dark"] .auth-particle {
  background: rgba(96, 165, 250, 0.5);
}

[data-theme="dark"] .card:hover,
[data-theme="dark"] .why-card:hover,
[data-theme="dark"] .announcement-card:hover,
[data-theme="dark"] .doc-card:hover,
[data-theme="dark"] .site-stats-card:hover,
[data-theme="dark"] .resource-action-card:hover,
[data-theme="dark"] .paper-year-card:hover {
  transform: translateY(-4px) translateZ(0) !important;
  box-shadow: 0 18px 40px -6px rgba(0, 0, 0, 0.75), 0 0 28px rgba(37, 99, 235, 0.26), inset 0 1px 0 rgba(255, 255, 255, 0.2) !important;
  border-color: rgba(96, 165, 250, 0.45) !important;
}

/* Glass Navbar in Dark Mode */
[data-theme="dark"] .navbar {
  background: rgba(10, 16, 32, 0.85) !important;
  backdrop-filter: blur(22px) saturate(190%) !important;
  -webkit-backdrop-filter: blur(22px) saturate(190%) !important;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1) !important;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45) !important;
}

[data-theme="dark"] .navbar.scrolled {
  background: rgba(12, 19, 38, 0.9) !important;
  border: 1px solid rgba(255, 255, 255, 0.14) !important;
  box-shadow: 0 18px 45px -8px rgba(0, 0, 0, 0.75), 0 0 22px rgba(37, 99, 235, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.16) !important;
}

[data-theme="dark"] .logo,
[data-theme="dark"] .logo span {
  color: #ffffff !important;
  text-shadow: 0 0 20px rgba(59, 130, 246, 0.55);
}

[data-theme="dark"] .nav-link {
  color: #94a3b8 !important;
}

[data-theme="dark"] .nav-link:hover {
  color: #ffffff !important;
  background: rgba(255, 255, 255, 0.08) !important;
}

[data-theme="dark"] .nav-link.active {
  color: #ffffff !important;
  background: linear-gradient(135deg, #2563eb, #3b82f6) !important;
  box-shadow: 0 4px 18px rgba(37, 99, 235, 0.5) !important;
}

/* Dark UI Switcher Bar */
[data-theme="dark"] .ui-switcher-bar {
  background: rgba(15, 23, 42, 0.88) !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  box-shadow: 0 12px 32px -6px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.06), inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
}

[data-theme="dark"] .ui-switcher-status {
  color: #e2e8f0 !important;
}

[data-theme="dark"] .ui-toggle-label.dark-label {
  color: #93c5fd !important;
  font-weight: 700 !important;
  text-shadow: 0 0 12px rgba(147, 197, 253, 0.5);
}

/* Headings and Typography in Dark Mode */
[data-theme="dark"] h1,
[data-theme="dark"] h2,
[data-theme="dark"] h3,
[data-theme="dark"] h4,
[data-theme="dark"] h5,
[data-theme="dark"] h6,
[data-theme="dark"] .section-title,
[data-theme="dark"] .hero-content h1,
[data-theme="dark"] .modal-title,
[data-theme="dark"] .folder-name,
[data-theme="dark"] .doc-meta h5,
[data-theme="dark"] .form-label,
[data-theme="dark"] .why-card h3 {
  color: #f8fafc !important;
}

[data-theme="dark"] p,
[data-theme="dark"] .hero-content p,
[data-theme="dark"] .why-item,
[data-theme="dark"] .doc-meta-details,
[data-theme="dark"] .announcement-content,
[data-theme="dark"] .text-muted,
[data-theme="dark"] .form-footer {
  color: #94a3b8 !important;
}

/* Primary Button with Gradient Glow & Shine Sweep in Dark Mode */
[data-theme="dark"] .btn-primary {
  background: linear-gradient(135deg, #2563eb 0%, #3b82f6 100%) !important;
  color: #ffffff !important;
  border: 1px solid rgba(147, 197, 253, 0.35) !important;
  box-shadow: 0 4px 18px rgba(37, 99, 235, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.28) !important;
  position: relative;
  overflow: hidden;
  transform: translateZ(0);
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.22s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.22s ease !important;
}

[data-theme="dark"] .btn-primary:hover {
  transform: translateY(-2px) scale(1.02) translateZ(0) !important;
  box-shadow: 0 8px 28px rgba(37, 99, 235, 0.7), 0 0 20px rgba(96, 165, 250, 0.45) !important;
  border-color: rgba(191, 219, 254, 0.6) !important;
}

[data-theme="dark"] .btn-primary:active {
  transform: translateY(0) scale(0.98) translateZ(0) !important;
  box-shadow: 0 2px 10px rgba(37, 99, 235, 0.5) !important;
}

[data-theme="dark"] .btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -120%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.32), transparent);
  transition: left 0.55s ease;
  pointer-events: none;
}

[data-theme="dark"] .btn-primary:hover::after {
  left: 120%;
}

/* Secondary Button in Dark Mode */
[data-theme="dark"] .btn-secondary {
  background: rgba(22, 33, 58, 0.75) !important;
  color: #f1f5f9 !important;
  border: 1px solid rgba(255, 255, 255, 0.14) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.1) !important;
  transform: translateZ(0);
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1),
              background-color 0.22s ease,
              border-color 0.22s ease,
              box-shadow 0.22s ease !important;
}

[data-theme="dark"] .btn-secondary:hover {
  transform: translateY(-2px) translateZ(0) !important;
  background: rgba(30, 48, 86, 0.95) !important;
  border-color: rgba(96, 165, 250, 0.55) !important;
  color: #ffffff !important;
  box-shadow: 0 6px 22px rgba(0, 0, 0, 0.5), 0 0 16px rgba(37, 99, 235, 0.28) !important;
}

[data-theme="dark"] .btn-secondary:active {
  transform: translateY(0) scale(0.98) translateZ(0) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.4) !important;
}

/* Leaderboard Rankings Interactive Styling in Dark Mode */
[data-theme="dark"] #contributor-ranking-list > div {
  background: rgba(20, 31, 58, 0.75) !important;
  border: 1px solid rgba(255, 255, 255, 0.09) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.06) !important;
  transform: translateZ(0);
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1),
              background-color 0.22s ease,
              border-color 0.22s ease,
              box-shadow 0.22s ease !important;
}

[data-theme="dark"] #contributor-ranking-list > div:hover {
  transform: translateX(4px) translateZ(0) !important;
  background: rgba(28, 44, 80, 0.92) !important;
  border-color: rgba(96, 165, 250, 0.5) !important;
  box-shadow: 0 4px 20px rgba(37, 99, 235, 0.28) !important;
}

/* 1st Place - Gold Accents */
[data-theme="dark"] #contributor-ranking-list > div:first-child {
  border-color: rgba(245, 158, 11, 0.5) !important;
  background: linear-gradient(90deg, rgba(245, 158, 11, 0.14) 0%, rgba(20, 31, 58, 0.85) 100%) !important;
  box-shadow: 0 4px 18px rgba(245, 158, 11, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.12) !important;
}

/* 2nd Place - Silver Accents */
[data-theme="dark"] #contributor-ranking-list > div:nth-child(2) {
  border-color: rgba(148, 163, 184, 0.45) !important;
  background: linear-gradient(90deg, rgba(148, 163, 184, 0.12) 0%, rgba(20, 31, 58, 0.85) 100%) !important;
}

/* 3rd Place - Bronze Accents */
[data-theme="dark"] #contributor-ranking-list > div:nth-child(3) {
  border-color: rgba(217, 119, 6, 0.4) !important;
  background: linear-gradient(90deg, rgba(217, 119, 6, 0.1) 0%, rgba(20, 31, 58, 0.85) 100%) !important;
}

[data-theme="dark"] .site-stats-card:hover #stat-average-rating i {
  animation: starPulse 0.5s ease;
}

@keyframes starPulse {
  0% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.3) rotate(20deg); }
  100% { transform: scale(1) rotate(0deg); }
}

/* Form Controls & Inputs */
[data-theme="dark"] .form-input,
[data-theme="dark"] .form-select,
[data-theme="dark"] .search-input,
[data-theme="dark"] textarea.form-input {
  background: rgba(13, 20, 38, 0.75) !important;
  border: 1px solid rgba(255, 255, 255, 0.14) !important;
  color: #f8fafc !important;
  backdrop-filter: blur(12px) !important;
  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.4) !important;
  transition: all 0.2s ease !important;
}

[data-theme="dark"] .form-input:focus,
[data-theme="dark"] .form-select:focus,
[data-theme="dark"] .search-input:focus {
  background: rgba(15, 24, 46, 0.9) !important;
  border-color: #60a5fa !important;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.35), 0 0 18px rgba(59, 130, 246, 0.3) !important;
}

/* Modals & Dialogs in Dark Mode */
[data-theme="dark"] .modal-overlay {
  background-color: rgba(2, 6, 23, 0.78) !important;
  backdrop-filter: blur(14px) !important;
}

[data-theme="dark"] .modal-content {
  background: rgba(13, 20, 38, 0.92) !important;
  backdrop-filter: blur(28px) saturate(190%) !important;
  border: 1px solid rgba(255, 255, 255, 0.15) !important;
  box-shadow: 0 25px 60px -10px rgba(0, 0, 0, 0.9), 0 0 35px rgba(37, 99, 235, 0.22), inset 0 1px 0 rgba(255, 255, 255, 0.22) !important;
}

[data-theme="dark"] .modal-close {
  color: #94a3b8 !important;
}

[data-theme="dark"] .modal-close:hover {
  color: #ffffff !important;
}

/* Dropdown Menus & More Options in Dark Mode */
[data-theme="dark"] .more-options-dropdown,
[data-theme="dark"] .profile-dropdown,
[data-theme="dark"] .user-dropdown-menu {
  background: rgba(13, 20, 38, 0.95) !important;
  backdrop-filter: blur(24px) saturate(190%) !important;
  border: 1px solid rgba(255, 255, 255, 0.14) !important;
  box-shadow: 0 20px 45px -8px rgba(0, 0, 0, 0.8), 0 0 20px rgba(37, 99, 235, 0.2) !important;
}

[data-theme="dark"] .dropdown-item,
[data-theme="dark"] .profile-dropdown-link {
  color: #e2e8f0 !important;
}

[data-theme="dark"] .dropdown-item:hover,
[data-theme="dark"] .profile-dropdown-link:hover {
  background: rgba(255, 255, 255, 0.08) !important;
  color: #ffffff !important;
}

/* Folders & Breadcrumbs */
[data-theme="dark"] .folder-item:hover {
  background-color: rgba(255, 255, 255, 0.06) !important;
}

[data-theme="dark"] .folder-btn {
  background-color: rgba(20, 31, 58, 0.85) !important;
  border: 1px solid rgba(255, 255, 255, 0.12) !important;
  color: #94a3b8 !important;
}

[data-theme="dark"] .folder-btn:hover {
  background-color: var(--primary) !important;
  color: #ffffff !important;
}

[data-theme="dark"] .breadcrumb-active {
  color: #f8fafc !important;
}

[data-theme="dark"] .papers-filter-bar {
  background: rgba(13, 20, 38, 0.75) !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
  backdrop-filter: blur(16px) !important;
}

/* Font Style Cards in Dark Mode */
[data-theme="dark"] .font-style-card {
  background: rgba(18, 28, 54, 0.8) !important;
  border: 1px solid rgba(255, 255, 255, 0.1) !important;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3) !important;
}

[data-theme="dark"] .font-style-card:hover {
  background: rgba(26, 40, 76, 0.95) !important;
  border-color: rgba(96, 165, 250, 0.5) !important;
  box-shadow: 0 4px 18px rgba(37, 99, 235, 0.25) !important;
  transform: translateY(-2px) !important;
}

[data-theme="dark"] .font-style-card.active {
  background: rgba(37, 99, 235, 0.2) !important;
  border-color: #3b82f6 !important;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.25), 0 4px 18px rgba(37, 99, 235, 0.3) !important;
}

/* Mobile Bottom Dock in Dark Mode */
@media (min-width: 769px) {
  [data-theme="dark"] .mobile-bottom-nav.desktop-scrolled-show {
    background: rgba(13, 20, 38, 0.9) !important;
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
    box-shadow: 0 24px 55px -10px rgba(0, 0, 0, 0.85), 0 0 25px rgba(37, 99, 235, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.2) !important;
  }

  [data-theme="dark"] .mobile-bottom-nav.desktop-scrolled-show .tab__icon,
  [data-theme="dark"] .mobile-bottom-nav.desktop-scrolled-show .tab__label {
    color: #94a3b8 !important;
  }

  [data-theme="dark"] .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item:hover .tab__icon,
  [data-theme="dark"] .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item:hover .tab__label {
    color: #ffffff !important;
  }

  [data-theme="dark"] .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item[aria-selected="true"],
  [data-theme="dark"] .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item.active {
    background: rgba(37, 99, 235, 0.25) !important;
    border: 1px solid rgba(96, 165, 250, 0.45) !important;
    box-shadow: 0 4px 18px rgba(37, 99, 235, 0.35) !important;
  }

  [data-theme="dark"] .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item[aria-selected="true"] .tab__icon,
  [data-theme="dark"] .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item.active .tab__icon,
  [data-theme="dark"] .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item[aria-selected="true"] .tab__label,
  [data-theme="dark"] .mobile-bottom-nav.desktop-scrolled-show .mobile-bottom-nav-item.active .tab__label {
    color: #93c5fd !important;
  }
}

/* Mobile Top and Bottom Bar in Dark Mode */
@media (max-width: 768px) {
  [data-theme="dark"] .mobile-top-bar {
    background: rgba(15, 23, 42, 0.92) !important;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1) !important;
  }

  [data-theme="dark"] .mobile-page-title,
  [data-theme="dark"] #mobile-page-title {
    color: #ffffff !important;
  }

  [data-theme="dark"] .mobile-bottom-nav {
    background: rgba(15, 23, 42, 0.92) !important;
    border-top: 1px solid rgba(255, 255, 255, 0.1) !important;
  }

  [data-theme="dark"] .mobile-nav-menu {
    background: rgba(15, 23, 42, 0.96) !important;
    border-right: 1px solid rgba(255, 255, 255, 0.1) !important;
  }

  [data-theme="dark"] .mobile-nav-item,
  [data-theme="dark"] .profile-menu-item {
    color: #e2e8f0 !important;
  }

  [data-theme="dark"] .mobile-nav-item:hover,
  [data-theme="dark"] .profile-menu-item:hover {
    background: rgba(255, 255, 255, 0.06) !important;
  }
}

/* Empty States & Upload Box */
[data-theme="dark"] .empty-state {
  background-color: rgba(255, 255, 255, 0.03) !important;
  border-color: rgba(255, 255, 255, 0.12) !important;
  color: #94a3b8 !important;
}

[data-theme="dark"] .file-upload-box {
  background-color: rgba(255, 255, 255, 0.03) !important;
  border-color: rgba(255, 255, 255, 0.15) !important;
}

[data-theme="dark"] .file-upload-box:hover {
  background-color: rgba(37, 99, 235, 0.08) !important;
  border-color: var(--primary-light) !important;
}

/* Mobile Top Bar & Dock in Dark Mode */
[data-theme="dark"] .mobile-top-bar a.mobile-logo,
[data-theme="dark"] .mobile-top-bar a.mobile-logo span,
[data-theme="dark"] #mobile-page-title,
[data-theme="dark"] .mobile-top-bar-title {
  color: #ffffff !important;
}

[data-theme="dark"] .dock__plate-hi {
  stop-color: #1a233a !important;
}

[data-theme="dark"] .dock__plate-lo {
  stop-color: #0c1222 !important;
}

[data-theme="dark"] .dock__fill {
  stroke: rgba(255, 255, 255, 0.12) !important;
}

[data-theme="dark"] .dock__skin {
  filter: drop-shadow(0 14px 32px rgba(0, 0, 0, 0.7)) drop-shadow(0 0 16px rgba(37, 99, 235, 0.22)) !important;
}

[data-theme="dark"] .mobile-bottom-nav .tab__icon,
[data-theme="dark"] .mobile-bottom-nav .tab__label {
  color: #94a3b8 !important;
}

[data-theme="dark"] .mobile-bottom-nav .tab[aria-selected="true"] .tab__label,
[data-theme="dark"] .mobile-bottom-nav .tab.active .tab__label {
  color: #93c5fd !important;
  font-weight: 700 !important;
}

[data-theme="dark"] .dock__bead {
  background: var(--primary) !important;
  box-shadow: 0 0 18px 4px var(--primary-glow), 0 0 8px 1px #ffffff !important;
}

/* Desktop Footer in Dark Mode */
@media (min-width: 769px) {
  [data-theme="dark"] .desktop-footer {
    background: rgba(11, 16, 32, 0.95) !important;
    border-top: 1px solid rgba(255, 255, 255, 0.1) !important;
    color: #f8fafc !important;
    box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.5) !important;
  }
  [data-theme="dark"] .desktop-footer .footer-brand {
    color: #ffffff !important;
    text-shadow: 0 0 16px rgba(59, 130, 246, 0.5);
  }
  [data-theme="dark"] .desktop-footer .footer-tagline,
  [data-theme="dark"] .desktop-footer .footer-copyright,
  [data-theme="dark"] .desktop-footer .footer-connect {
    color: #94a3b8 !important;
  }
  [data-theme="dark"] .desktop-footer .footer-links a,
  [data-theme="dark"] .desktop-footer .footer-connect a {
    color: #93c5fd !important;
  }
  [data-theme="dark"] .desktop-footer .footer-divider {
    color: rgba(255, 255, 255, 0.2) !important;
  }
}

/* ==========================================================================
   HOMEPAGE SCROLL ANIMATIONS & GLOW PROGRESS BAR (60/120 FPS GPU ACCELERATED)
   ========================================================================== */

/* Top Scroll Progress Indicator */
#scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--primary) 0%, #38bdf8 50%, #60a5fa 100%);
  box-shadow: 0 0 12px var(--primary-glow), 0 0 4px #ffffff;
  z-index: 100000;
  pointer-events: none;
  transform: translateZ(0);
  transition: width 0.12s cubic-bezier(0.1, 0.9, 0.2, 1);
  will-change: width;
}

[data-theme="dark"] #scroll-progress-bar {
  background: linear-gradient(90deg, #2563eb 0%, #38bdf8 50%, #93c5fd 100%);
  box-shadow: 0 0 14px rgba(37, 99, 235, 0.65), 0 0 6px rgba(56, 189, 248, 0.45);
}

/* Scroll Reveal Base Classes */
.sh-reveal {
  opacity: 0;
  transform: translateY(28px) translateZ(0);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.sh-reveal-left {
  opacity: 0;
  transform: translateX(-32px) translateZ(0);
  transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.sh-reveal-right {
  opacity: 0;
  transform: translateX(32px) translateZ(0);
  transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.sh-reveal-scale {
  opacity: 0;
  transform: scale(0.95) translateY(24px) translateZ(0);
  transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

/* Triggered In-View State */
.sh-reveal.in-view,
.sh-reveal-left.in-view,
.sh-reveal-right.in-view,
.sh-reveal-scale.in-view {
  opacity: 1 !important;
  transform: translate(0, 0) scale(1) translateZ(0) !important;
}

/* Staggered Children Animation */
.sh-reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px) translateZ(0);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

.sh-reveal-stagger.in-view > *:nth-child(1) { transition-delay: 0.05s; opacity: 1; transform: translateY(0) translateZ(0); }
.sh-reveal-stagger.in-view > *:nth-child(2) { transition-delay: 0.12s; opacity: 1; transform: translateY(0) translateZ(0); }
.sh-reveal-stagger.in-view > *:nth-child(3) { transition-delay: 0.19s; opacity: 1; transform: translateY(0) translateZ(0); }
.sh-reveal-stagger.in-view > *:nth-child(4) { transition-delay: 0.26s; opacity: 1; transform: translateY(0) translateZ(0); }
.sh-reveal-stagger.in-view > *:nth-child(5) { transition-delay: 0.33s; opacity: 1; transform: translateY(0) translateZ(0); }
.sh-reveal-stagger.in-view > *:nth-child(n+6) { transition-delay: 0.40s; opacity: 1; transform: translateY(0) translateZ(0); }

/* Why Study Hub Item Micro-Interaction on Reveal */
.why-item {
  transform: translateX(0);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), color 0.2s ease;
}

.why-item:hover {
  transform: translateX(6px) !important;
}

.why-item:hover .why-icon i {
  transform: scale(1.2) rotate(6deg);
  transition: transform 0.25s ease;
}

/* Announcement Cards Staggered Slide */
.announcement-card {
  transform: translateZ(0);
  will-change: transform, box-shadow;
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.25s cubic-bezier(0.16, 1, 0.3, 1),
              border-color 0.25s ease !important;
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  .sh-reveal,
  .sh-reveal-left,
  .sh-reveal-right,
  .sh-reveal-scale,
  .sh-reveal-stagger > * {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  #scroll-progress-bar {
    display: none !important;
  }
}



/* Fix for notes/papers layout gap */
#view-notes, #view-papers, #view-resources {
  align-items: flex-start !important;
  justify-content: flex-start !important;
  margin-top: 0 !important;
  padding-top: 0 !important;
}
#view-notes > .page-container, #view-papers > .page-container {
  margin-top: 0 !important;
  padding-top: 0 !important;
  height: auto !important;
  min-height: auto !important;
}

/* ===== SHIFT TREE MODAL STYLES ===== */
.shift-tree-section {
  margin-bottom: 6px;
}

.shift-tree-section-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  background: linear-gradient(135deg, rgba(99,102,241,0.06), rgba(139,92,246,0.04));
  border: 1px solid transparent;
  transition: all 0.2s ease;
  user-select: none;
  letter-spacing: 0.01em;
}

.shift-tree-section-header:hover {
  background: linear-gradient(135deg, rgba(99,102,241,0.12), rgba(139,92,246,0.08));
  border-color: rgba(99,102,241,0.15);
}

.shift-tree-section-header.selected {
  background: linear-gradient(135deg, rgba(99,102,241,0.18), rgba(139,92,246,0.14));
  border-color: rgba(99,102,241,0.35);
  color: var(--primary-dark, #4338ca);
  box-shadow: 0 0 0 2px rgba(99,102,241,0.1);
}

.shift-tree-section-header .section-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--primary, #6366f1);
}

.shift-tree-section-header .section-chevron {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  color: var(--text-muted);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  margin-left: auto;
}

.shift-tree-section-header.expanded .section-chevron {
  transform: rotate(90deg);
}

.shift-tree-section-header .section-count {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  background: rgba(99,102,241,0.08);
  padding: 1px 7px;
  border-radius: 10px;
  margin-left: 4px;
}

.shift-tree-children {
  overflow: hidden;
  transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s ease;
  max-height: 0;
  opacity: 0;
  padding-left: 12px;
}

.shift-tree-children.open {
  max-height: 2000px;
  opacity: 1;
}

.shift-tree-node {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 10px;
  margin: 2px 0;
  border-radius: 7px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-main);
  transition: all 0.15s ease;
  border: 1px solid transparent;
  position: relative;
}

.shift-tree-node:hover {
  background: rgba(99,102,241,0.06);
  border-color: rgba(99,102,241,0.1);
}

.shift-tree-node.selected {
  background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(139,92,246,0.1));
  border-color: rgba(99,102,241,0.3);
  color: var(--primary-dark, #4338ca);
  font-weight: 600;
  box-shadow: 0 0 0 2px rgba(99,102,241,0.08);
}

.shift-tree-node .node-icon {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
  color: var(--warning, #f59e0b);
}

.shift-tree-node .node-chevron {
  width: 13px;
  height: 13px;
  flex-shrink: 0;
  color: var(--text-muted);
  transition: transform 0.2s ease;
  cursor: pointer;
}

.shift-tree-node.has-children .node-chevron.rotated {
  transform: rotate(90deg);
}

.shift-tree-node .node-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.shift-tree-node .subfolder-count {
  font-size: 10px;
  color: var(--text-muted);
  background: rgba(0,0,0,0.04);
  padding: 1px 6px;
  border-radius: 8px;
  flex-shrink: 0;
}

.shift-tree-node.dimmed {
  opacity: 0.4;
  pointer-events: none;
}

.shift-tree-root-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  margin: 4px 0 6px 0;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  border: 1px dashed var(--border-color);
  transition: all 0.15s ease;
}

.shift-tree-root-option:hover {
  background: rgba(99,102,241,0.06);
  border-color: rgba(99,102,241,0.2);
  color: var(--primary);
}

.shift-tree-root-option.selected {
  background: linear-gradient(135deg, rgba(99,102,241,0.12), rgba(139,92,246,0.08));
  border-color: rgba(99,102,241,0.3);
  border-style: solid;
  color: var(--primary-dark, #4338ca);
}

.shift-tree-no-results {
  text-align: center;
  padding: 28px 16px;
  color: var(--text-muted);
  font-size: 13px;
}

.shift-tree-no-results i {
  display: block;
  margin: 0 auto 8px;
  width: 28px;
  height: 28px;
  opacity: 0.5;
}

@keyframes shiftNodeHighlight {
  0% { background: rgba(99,102,241,0.2); }
  100% { background: transparent; }
}

.shift-tree-node.search-highlight,
.shift-tree-section-header.search-highlight {
  animation: shiftNodeHighlight 1.5s ease-out;
}

#shift-tree-container::-webkit-scrollbar {
  width: 6px;
}

#shift-tree-container::-webkit-scrollbar-track {
  background: transparent;
}

#shift-tree-container::-webkit-scrollbar-thumb {
  background: rgba(99,102,241,0.15);
  border-radius: 3px;
}

#shift-tree-container::-webkit-scrollbar-thumb:hover {
  background: rgba(99,102,241,0.3);
}