:root {
  --bg-primary: #0a0e14;
  --bg-secondary: #121822;
  --bg-card: #182232;
  --bg-card-hover: #1f2c40;
  --accent: #4f8cff;
  --accent-light: #70a1ff;
  --accent-glow: rgba(79, 140, 255, 0.15);
  --text-main: #f0f4f8;
  --text-muted: #8b9bb0;
  --border: #233044;
  --border-light: #32435e;
  --success: #2ec4b6;
  --success-glow: rgba(46, 196, 182, 0.15);
  --warning: #ff9f1c;
  --warning-glow: rgba(255, 159, 28, 0.15);
  --danger: #e71d36;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1rem 4rem 1rem;
}

/* Header & Navigation */
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 1rem 0 1.5rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}

.brand h1 {
  font-size: 1.7rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #fff;
}

.brand h1 span { color: var(--accent); }
.brand .sub { font-size: 0.85rem; color: var(--text-muted); }

.auth-panel {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Tabs */
.tabs-nav {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
  overflow-x: auto;
  padding-bottom: 0.25rem;
}

.tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.6rem 1rem;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.tab-btn:hover { color: #fff; }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* Filters */
.filter-bar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 1.25rem;
}

.filter-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
}

.filter-btn:hover { border-color: var(--border-light); color: var(--text-main); }
.filter-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
}

.item-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease, border-color 0.15s ease;
}

.item-card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
}

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

.card-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.3;
}

.card-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.badges {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.badge {
  display: inline-block;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-year { background: rgba(79, 140, 255, 0.2); color: var(--accent-light); }
.badge-dept { background: rgba(255, 255, 255, 0.08); color: var(--text-main); }
.badge-type { background: rgba(46, 196, 182, 0.2); color: var(--success); }
.badge-todo { background: var(--warning-glow); color: var(--warning); }
.badge-completed { background: var(--success-glow); color: var(--success); }
.badge-progress { background: var(--accent-glow); color: var(--accent-light); }

/* Buttons & Links */
.link-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(79, 140, 255, 0.12);
  color: var(--accent-light);
  border: 1px solid rgba(79, 140, 255, 0.3);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.15s ease;
}

.link-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.status-toggle {
  display: flex;
  gap: 0.3rem;
  margin-top: 0.75rem;
}

.status-opt {
  flex: 1;
  text-align: center;
  padding: 0.35rem 0.2rem;
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.12s ease;
}

.status-opt.active[data-val="todo"] {
  background: var(--warning-glow);
  color: var(--warning);
  border-color: var(--warning);
}
.status-opt.active[data-val="in_progress"] {
  background: var(--accent-glow);
  color: var(--accent-light);
  border-color: var(--accent);
}
.status-opt.active[data-val="completed"] {
  background: var(--success-glow);
  color: var(--success);
  border-color: var(--success);
}

/* PDF Modal */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.85);
  z-index: 1000;
  padding: 1rem;
  justify-content: center;
  align-items: center;
}

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

.modal-container {
  background: var(--bg-secondary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  width: 95vw;
  max-width: 1100px;
  height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  padding: 0.8rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-iframe {
  flex: 1;
  width: 100%;
  border: none;
  background: #fff;
}

.close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
}
.close-btn:hover { color: #fff; }

/* Search Inputs */
.search-box {
  width: 100%;
  max-width: 360px;
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-secondary);
  color: var(--text-main);
  font-size: 0.9rem;
}
.search-box:focus {
  outline: none;
  border-color: var(--accent);
}

/* ==========================================================================
   Calendar & Timetable Component
   ========================================================================== */
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1rem;
  align-items: start;
}

@media (max-width: 1100px) {
  .calendar-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

.calendar-day-col {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-height: 250px;
}

.day-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--border);
}

.day-header h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.3px;
}

.day-lectures {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.lecture-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
  transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.lecture-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35);
}

.lecture-time-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: var(--accent-glow);
  color: var(--accent-light);
  border: 1px solid rgba(79, 140, 255, 0.35);
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-weight: 700;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  width: fit-content;
}

.lecture-header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.lecture-title {
  font-size: 0.98rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.25;
}

.lecture-location {
  font-size: 0.82rem;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: 0.15rem;
}

.lecture-instructor {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* Homework inside Lecture Slot */
.lecture-hw-box {
  background: rgba(255, 159, 28, 0.08);
  border: 1px solid rgba(255, 159, 28, 0.35);
  border-radius: var(--radius-sm);
  padding: 0.65rem;
  margin-top: 0.35rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.lecture-hw-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--warning);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.lecture-hw-item {
  background: rgba(18, 24, 34, 0.8);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.lecture-hw-item .hw-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: #fff;
  line-height: 1.25;
}

.lecture-hw-item .hw-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.76rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 0.25rem;
}

/* Agenda Timeline Component */
.agenda-container {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.agenda-date-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.2rem;
}

.agenda-date-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.agenda-timeline {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.agenda-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  transition: transform 0.12s ease;
}

.agenda-item.type-esonero {
  border-left-color: var(--danger);
  background: rgba(231, 29, 54, 0.05);
}

.agenda-item:hover {
  transform: translateX(3px);
  border-color: var(--border-light);
}

.agenda-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.agenda-hour-badge {
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--accent-light);
  font-variant-numeric: tabular-nums;
}

/* --- Moodle & CampusNet Announcements Review Center --- */
.notif-bell-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.45rem 0.9rem;
  cursor: pointer;
}

.notif-bell-btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.badge-count {
  background: var(--border);
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  line-height: 1;
}

.badge-count.has-unreviewed {
  background: var(--danger);
  color: #fff;
  box-shadow: 0 0 10px rgba(231, 29, 54, 0.4);
}

.announcements-banner {
  background: linear-gradient(90deg, rgba(79, 140, 255, 0.12) 0%, rgba(255, 159, 28, 0.12) 100%);
  border: 1px solid rgba(79, 140, 255, 0.3);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  margin-bottom: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.banner-left {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.banner-icon {
  font-size: 1.5rem;
}

.banner-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.review-modal-container {
  max-width: 820px;
  max-height: 88vh;
  display: flex;
  flex-direction: column;
}

.review-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  padding: 0.85rem 1.25rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}

.review-list-container {
  overflow-y: auto;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.announcement-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  transition: border-color 0.15s ease;
}

.announcement-card.status-unreviewed {
  border-left: 4px solid var(--warning);
}

.announcement-card.status-confirmed {
  border-left: 4px solid var(--success);
  opacity: 0.9;
}

.announcement-card.status-dismissed {
  border-left: 4px solid var(--border);
  opacity: 0.6;
}

.badge-source-moodle {
  background: rgba(79, 140, 255, 0.2);
  color: var(--accent-light);
  border: 1px solid rgba(79, 140, 255, 0.4);
}

.badge-source-campusnet {
  background: rgba(46, 196, 182, 0.2);
  color: var(--success);
  border: 1px solid rgba(46, 196, 182, 0.4);
}

.ai-summary-box {
  background: rgba(10, 14, 20, 0.6);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 0.75rem 0.9rem;
  margin-top: 0.3rem;
}

.ai-summary-header {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-light);
  margin-bottom: 0.35rem;
}

.ai-summary-text {
  font-size: 0.86rem;
  color: var(--text-main);
  line-height: 1.45;
}

.ann-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.4rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border);
}

.btn-confirm {
  background: var(--success);
  color: #0a0e14;
  font-weight: 700;
  font-size: 0.82rem;
  padding: 0.4rem 0.85rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.btn-confirm:hover {
  opacity: 0.9;
}

.btn-dismiss {
  background: transparent;
  color: var(--text-muted);
  font-size: 0.82rem;
  padding: 0.4rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.btn-dismiss:hover {
  background: rgba(231, 29, 54, 0.1);
  color: var(--danger);
  border-color: var(--danger);
}

.btn-undo {
  background: transparent;
  color: var(--text-muted);
  font-size: 0.8rem;
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.btn-undo:hover {
  color: var(--text-main);
  border-color: var(--text-muted);
}