/* ==========================================================================
   Advanced NLP (IUST - Semester 4051) Design System
   Modern Academic Light-Theme Aesthetic & Responsive Components
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root {
  /* Crisp Modern Academic Light Theme */
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.92);
  
  --border-subtle: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-hover: #0284c7;
  --border-focus: #0284c7;
  
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-accent: #0284c7;

  --accent-primary: #0284c7;
  --accent-primary-hover: #0369a1;
  --accent-secondary: #4f46e5;
  --accent-indigo: #4338ca;
  --accent-emerald: #059669;
  --accent-amber: #d97706;
  --accent-rose: #e11d48;
  --accent-purple: #7e22ce;

  --badge-lecture-bg: #e0f2fe;
  --badge-lecture-text: #0369a1;
  --badge-quiz-bg: #fef3c7;
  --badge-quiz-text: #b45309;
  --badge-exam-bg: #ffe4e6;
  --badge-exam-text: #be123c;
  --badge-review-bg: #f3e8ff;
  --badge-review-text: #6b21a8;
  --badge-present-bg: #d1fae5;
  --badge-present-text: #047857;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px -1px rgba(15, 23, 42, 0.08), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 10px 25px -3px rgba(15, 23, 42, 0.1), 0 4px 6px -4px rgba(15, 23, 42, 0.05);
  --shadow-glow: 0 0 20px -2px rgba(2, 132, 199, 0.15);

  --font-display: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 22px;
  --radius-full: 9999px;

  --nav-height: 72px;
  --max-width: 1240px;
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

p {
  color: var(--text-secondary);
}

a {
  color: var(--accent-primary);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

a:hover {
  color: var(--accent-primary-hover);
}

code, kbd, pre {
  font-family: var(--font-mono);
}

img, svg {
  vertical-align: middle;
  max-width: 100%;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* Section Spacing */
.section {
  padding: 4rem 0;
  position: relative;
}

.section-header {
  margin-bottom: 2.25rem;
}

.section-title {
  font-size: 2.1rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 760px;
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  height: var(--nav-height);
  background-color: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 1px 4px 0 rgba(15, 23, 42, 0.04);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  color: var(--text-primary);
  font-weight: 700;
  text-decoration: none;
}

.brand-logo {
  width: 44px;
  height: 44px;
  object-fit: contain;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.brand-subtitle {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--accent-primary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 0.85rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav-link:hover {
  color: var(--accent-primary);
  background-color: var(--bg-tertiary);
}

.nav-link.active {
  color: var(--accent-primary);
  background-color: var(--badge-lecture-bg);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.btn-search-trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-size: 0.86rem;
  font-weight: 500;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.btn-search-trigger:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  box-shadow: var(--shadow-md);
}

.search-shortcut-kbd {
  font-size: 0.72rem;
  padding: 2px 6px;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
}

.mobile-menu-btn {
  display: none;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
  padding: 4.5rem 0 3.5rem;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
  background: linear-gradient(180deg, #ffffff 0%, #f8fafc 100%),
              radial-gradient(circle at 80% 20%, rgba(2, 132, 199, 0.06) 0%, transparent 50%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 3rem;
  align-items: center;
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.pill-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.8rem;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-full);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}

.pill-badge.primary {
  background-color: var(--badge-lecture-bg);
  border-color: rgba(2, 132, 199, 0.25);
  color: var(--accent-primary);
}

.pill-badge.term {
  background-color: #e0e7ff;
  border-color: rgba(79, 70, 229, 0.25);
  color: var(--accent-secondary);
}

.hero-title {
  font-size: 2.85rem;
  font-weight: 800;
  line-height: 1.18;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.hero-desc {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #ffffff;
  box-shadow: 0 4px 12px 0 rgba(2, 132, 199, 0.25);
}

.btn-primary:hover {
  background-color: var(--accent-primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px 0 rgba(2, 132, 199, 0.35);
}

.btn-secondary {
  background-color: var(--bg-secondary);
  border-color: var(--border-subtle);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background-color: var(--bg-tertiary);
  border-color: var(--border-hover);
  color: var(--accent-primary);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.82rem;
}

.hero-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
}

.hero-card-header {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.hero-crest-wrap {
  width: 60px;
  height: 60px;
  flex-shrink: 0;
}

.hero-crest-wrap img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.hero-card-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.stat-item {
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  text-align: center;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1.1;
  margin-bottom: 0.2rem;
}

.stat-label {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Announcements Section
   ========================================================================== */

.announcements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.25rem;
}

.announcement-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
}

.announcement-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.announcement-card.urgent {
  border-left: 4px solid var(--accent-amber);
}

.announcement-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.announcement-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  background-color: var(--badge-lecture-bg);
  color: var(--accent-primary);
}

.announcement-date {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.announcement-title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.announcement-content {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

/* ==========================================================================
   Cards, Badges & Interactive Components
   ========================================================================== */

.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.card:hover {
  border-color: var(--border-medium);
  box-shadow: var(--shadow-md);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 700;
  border-radius: var(--radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.badge-lecture {
  background-color: var(--badge-lecture-bg);
  color: var(--badge-lecture-text);
}

.badge-quiz {
  background-color: var(--badge-quiz-bg);
  color: var(--badge-quiz-text);
}

.badge-exam {
  background-color: var(--badge-exam-bg);
  color: var(--badge-exam-text);
}

.badge-review {
  background-color: var(--badge-review-bg);
  color: var(--badge-review-text);
}

.badge-presentation {
  background-color: var(--badge-present-bg);
  color: var(--badge-present-text);
}

.badge-head {
  background-color: #fee2e2;
  color: #b91c1c;
  font-weight: 800;
}

/* Quick Nav Cards */
.quick-nav-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
}

.quick-nav-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.75rem;
  border-radius: var(--radius-lg);
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.quick-nav-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.quick-nav-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--bg-tertiary);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  font-size: 1.4rem;
}

.quick-nav-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.quick-nav-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.quick-nav-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent-primary);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

/* ==========================================================================
   Schedule & Timeline Styles with Embedded Paper Box
   ========================================================================== */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  padding: 1rem 1.25rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip-btn {
  padding: 0.45rem 0.9rem;
  font-size: 0.84rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.chip-btn:hover {
  color: var(--accent-primary);
  border-color: var(--border-hover);
}

.chip-btn.active {
  background-color: var(--accent-primary);
  color: #ffffff;
  border-color: var(--accent-primary);
  font-weight: 700;
}

.search-input-wrap {
  position: relative;
  min-width: 240px;
}

.search-input {
  width: 100%;
  padding: 0.5rem 1rem 0.5rem 2.4rem;
  font-size: 0.88rem;
  background-color: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  outline: none;
  transition: border-color var(--transition-fast);
}

.search-input:focus {
  border-color: var(--border-focus);
}

.search-input-icon {
  position: absolute;
  left: 0.8rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

/* Schedule Timeline Cards with harmonious semantic tints */
.schedule-grid {
  display: flex;
  flex-direction: column;
  gap: 1.35rem;
}

.schedule-card {
  background-color: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  box-shadow: var(--shadow-sm);
}

.schedule-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* Specific soft harmonious tints for session types */
.schedule-card[data-type="lecture"] {
  background-color: #ffffff;
  border-color: var(--border-subtle);
}

.schedule-card[data-type="quiz"] {
  background-color: #fffdf5;
  border-color: #fde68a;
}

.schedule-card[data-type="quiz"]:hover {
  border-color: #f59e0b;
}

.schedule-card[data-type="quiz"] .session-meta-box {
  background-color: #fef3c7;
  border-color: #fde68a;
}

.schedule-card[data-type="exam"] {
  background-color: #fff5f5;
  border-color: #fecdd3;
}

.schedule-card[data-type="exam"]:hover {
  border-color: #f43f5e;
}

.schedule-card[data-type="exam"] .session-meta-box {
  background-color: #ffe4e6;
  border-color: #fecdd3;
}

.schedule-card[data-type="review"] {
  background-color: #faf5ff;
  border-color: #e9d5ff;
}

.schedule-card[data-type="review"]:hover {
  border-color: #a855f7;
}

.schedule-card[data-type="review"] .session-meta-box {
  background-color: #f3e8ff;
  border-color: #e9d5ff;
}

.schedule-card[data-type="presentation"] {
  background-color: #f0fdf4;
  border-color: #bbf7d0;
}

.schedule-card[data-type="presentation"]:hover {
  border-color: #22c55e;
}

.schedule-card[data-type="presentation"] .session-meta-box {
  background-color: #dcfce7;
  border-color: #bbf7d0;
}

.schedule-card-top {
  display: grid;
  grid-template-columns: 85px 1fr auto;
  gap: 1.5rem;
  align-items: flex-start;
}

.session-meta-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.65rem 0.5rem;
  text-align: center;
}

.session-week-tag {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
}

.session-id-tag {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent-primary);
}

.session-main-content {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.session-title-en {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
}

.session-presenter {
  font-size: 0.86rem;
  color: var(--accent-secondary);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-weight: 600;
}

.session-references {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.82rem;
  margin-top: 0.25rem;
}

.ref-item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-secondary);
}

.ref-tag {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--bg-tertiary);
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

.session-actions {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  align-items: flex-end;
}

/* Embedded Suggested Papers Box */
.session-papers-box {
  background-color: #f8fafc;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.15rem;
  margin-top: 0.25rem;
}

.papers-box-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.45rem;
}

.session-papers-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.session-paper-item {
  font-size: 0.88rem;
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
}

.paper-link {
  color: var(--accent-primary);
  font-weight: 600;
  transition: color var(--transition-fast);
}

.paper-link:hover {
  color: var(--accent-primary-hover);
  text-decoration: underline;
}

.paper-authors {
  color: var(--text-muted);
  font-size: 0.82rem;
}

/* ==========================================================================
   Team Page Styles
   ========================================================================== */

.team-section-block {
  margin-bottom: 3.5rem;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.75rem;
}

.team-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.team-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.team-avatar-wrap {
  width: 90px;
  height: 90px;
  border-radius: var(--radius-full);
  background: var(--bg-tertiary);
  border: 2px solid var(--accent-primary);
  padding: 2px;
  margin-bottom: 1.25rem;
  overflow: hidden;
  flex-shrink: 0;
}

.team-avatar-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-full);
  display: block;
}

.team-avatar-inner {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-full);
  background-color: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent-primary);
}

.team-name {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.team-info-list {
  list-style: none;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.team-info-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.team-social-links {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}

.social-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-md);
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.social-chip:hover {
  color: var(--accent-primary);
  border-color: var(--border-hover);
  background-color: #ffffff;
}

/* ==========================================================================
   Materials & Resources Page Styles
   ========================================================================== */

.resource-tabs {
  display: flex;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
  margin-bottom: 2rem;
  overflow-x: auto;
}

.resource-tab-btn {
  padding: 0.75rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.resource-tab-btn:hover {
  color: var(--accent-primary);
}

.resource-tab-btn.active {
  color: var(--accent-primary);
  border-bottom-color: var(--accent-primary);
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.resource-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
}

.resource-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-md);
}

.resource-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.resource-card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.resource-card-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

/* ==========================================================================
   Assignments & Grading Policy Styles
   ========================================================================== */

.grading-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  background-color: var(--bg-card);
  margin-bottom: 2rem;
  box-shadow: var(--shadow-sm);
}

.table-custom {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.table-custom th {
  padding: 1rem 1.25rem;
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  font-weight: 700;
  font-family: var(--font-display);
  border-bottom: 1px solid var(--border-subtle);
}

.table-custom td {
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.table-custom tr:last-child td {
  border-bottom: none;
}

.table-custom tr.total-row {
  background-color: #f0fdf4;
  font-weight: 700;
}

.table-custom tr.total-row td {
  color: var(--accent-emerald);
}

.progress-bar-wrap {
  width: 100%;
  height: 8px;
  background-color: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin-top: 6px;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: var(--radius-full);
}

/* Accordion FAQ */
.accordion {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.accordion-item {
  background-color: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.accordion-trigger {
  width: 100%;
  padding: 1.25rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: none;
  border: none;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.accordion-trigger:hover {
  background-color: var(--bg-tertiary);
}

.accordion-icon {
  transition: transform var(--transition-fast);
  color: var(--text-muted);
}

.accordion-item.active .accordion-icon {
  transform: rotate(180deg);
}

.accordion-body {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  display: none;
}

.accordion-item.active .accordion-body {
  display: block;
}

/* ==========================================================================
   Citation Box
   ========================================================================== */

.citation-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--shadow-sm);
}

.citation-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.citation-code {
  background-color: #f1f5f9;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #0369a1;
  overflow-x: auto;
  line-height: 1.5;
}

/* ==========================================================================
   Modal Dialog & Global Search
   ========================================================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(8px);
  z-index: 2000;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding: 5rem 1rem 1rem;
}

.modal-backdrop.open {
  display: flex;
}

.modal-dialog {
  background-color: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 640px;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalIn 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.96) translateY(-10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-search-header {
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-search-input {
  flex: 1;
  background: none;
  border: none;
  font-size: 1.1rem;
  color: var(--text-primary);
  outline: none;
}

.modal-search-results {
  max-height: 380px;
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.search-result-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-primary);
  transition: background-color var(--transition-fast);
}

.search-result-item:hover, .search-result-item.selected {
  background-color: var(--bg-tertiary);
}

.search-result-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--accent-primary);
}

.search-result-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Toast notifications */
.toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  padding: 0.75rem 1.25rem;
  background-color: #ffffff;
  border: 1px solid var(--accent-primary);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  font-size: 0.88rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  animation: toastIn 0.25s ease-out;
}

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

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  margin-top: auto;
  background-color: #ffffff;
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 0 2rem;
  font-size: 0.92rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.footer-col-title {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-links a {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 0.85rem;
}