/* ==============================================================================
   Mecha Bot — Telegram Mini App (Web App) Design System
   Department of Mechatronics Engineering, University of Basrah
   ============================================================================== */

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

:root {
  /* Core Color Palette: Mechatronics Dark Mode */
  --bg-primary: #070b14;
  --bg-secondary: #0f172a;
  --bg-tertiary: #1e293b;
  --bg-card: rgba(15, 23, 42, 0.78);
  --bg-card-hover: rgba(30, 41, 59, 0.85);

  /* Borders & Glows */
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(56, 189, 248, 0.5);
  --border-active: #38bdf8;
  --glow-cyan: rgba(56, 189, 248, 0.25);
  --glow-indigo: rgba(99, 102, 241, 0.25);

  /* Typography */
  --font-arabic: 'Readex Pro', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-stem: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-cyan: #38bdf8;
  --text-emerald: #34d399;
  --text-amber: #fbbf24;
  --text-rose: #f43f5e;

  /* Accents */
  --accent-cyan: #38bdf8;
  --accent-indigo: #6366f1;
  --accent-blue: #2563eb;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;

  /* Gradients */
  --grad-primary: linear-gradient(135deg, #0284c7 0%, #6366f1 100%);
  --grad-surface: linear-gradient(180deg, rgba(30, 41, 59, 0.6) 0%, rgba(15, 23, 42, 0.8) 100%);
  --grad-header: linear-gradient(135deg, rgba(14, 165, 233, 0.15) 0%, rgba(99, 102, 241, 0.08) 100%);
  --grad-glow: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.15), transparent 70%);

  /* UI Tokens */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --shadow-card: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  --shadow-glow: 0 0 20px rgba(56, 189, 248, 0.3);
  --transition-fast: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Telegram Dynamic Theme Overrides */
body.tg-theme {
  --bg-primary: var(--tg-theme-bg-color, #070b14);
  --text-primary: var(--tg-theme-text-color, #f8fafc);
  --text-secondary: var(--tg-theme-hint-color, #94a3b8);
  --accent-cyan: var(--tg-theme-button-color, #38bdf8);
  --bg-secondary: var(--tg-theme-secondary-bg-color, #0f172a);
}

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

html {
  font-family: var(--font-arabic);
  direction: rtl;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  background-color: var(--bg-primary);
  background-image: var(--grad-glow);
  background-repeat: no-repeat;
  background-size: 100% 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  overflow-x: hidden;
}

#app-container {
  width: 100%;
  max-width: 600px;
  min-height: 100vh;
  padding: 16px;
  padding-bottom: 90px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Header & Identity */
.app-header {
  background: var(--grad-header);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 18px 20px;
  backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.app-header::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 2px;
  background: var(--grad-primary);
}

.header-branding {
  display: flex;
  align-items: center;
  gap: 12px;
}

.bot-avatar-badge {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--grad-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  box-shadow: var(--shadow-glow);
}

.header-titles h1 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.3px;
}

.header-titles p {
  font-size: 12px;
  color: var(--text-secondary);
}

.live-clock-badge {
  background: rgba(15, 23, 42, 0.85);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: 999px;
  padding: 6px 12px;
  font-family: var(--font-stem);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-cyan);
  display: flex;
  align-items: center;
  gap: 6px;
}

.live-pulse-dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent-emerald);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0% { transform: scale(0.95); opacity: 0.8; }
  50% { transform: scale(1.3); opacity: 1; box-shadow: 0 0 14px #34d399; }
  100% { transform: scale(0.95); opacity: 0.8; }
}

/* Stage & Semester Quick Chips */
.stage-selector-bar {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}
.stage-selector-bar::-webkit-scrollbar { display: none; }

.stage-chip {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: var(--transition-fast);
}

.stage-chip:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: rgba(56, 189, 248, 0.3);
}

.stage-chip.active {
  background: var(--grad-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 4px 14px rgba(2, 132, 199, 0.4);
}

/* Weekday Day Bar */
.weekday-bar {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
  margin-top: 4px;
}

.day-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 4px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition-fast);
}

.day-btn .day-name {
  font-size: 13px;
  font-weight: 600;
  display: block;
  color: var(--text-secondary);
}

.day-btn .day-count {
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-stem);
}

.day-btn.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--accent-cyan);
}

.day-btn.active .day-name {
  color: var(--text-cyan);
}

.day-btn.active .day-count {
  color: var(--text-primary);
}

/* Timetable Lecture Cards */
.schedule-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.slot-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
}

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

.slot-card.now-live {
  border: 1px solid var(--accent-emerald);
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.2);
}

.slot-card.now-live::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 4px;
  background: var(--accent-emerald);
}

.slot-card.next-up {
  border-left: 4px solid var(--accent-cyan);
}

.slot-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
}

.slot-type-badge {
  font-size: 11px;
  font-weight: 600;
  padding: 3px 8px;
  border-radius: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.slot-type-badge.lecture { background: rgba(56, 189, 248, 0.15); color: var(--accent-cyan); }
.slot-type-badge.lab { background: rgba(168, 85, 247, 0.15); color: #c084fc; }
.slot-type-badge.tutorial { background: rgba(245, 158, 11, 0.15); color: var(--accent-amber); }

.slot-time {
  font-family: var(--font-stem);
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  direction: ltr;
}

.slot-title {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 6px;
}

.slot-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 12px;
  color: var(--text-secondary);
}

.slot-meta-item {
  display: flex;
  align-items: center;
  gap: 5px;
}

.slot-status-indicator {
  margin-top: 10px;
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.status-now { background: rgba(16, 185, 129, 0.18); color: var(--accent-emerald); }
.status-next { background: rgba(56, 189, 248, 0.18); color: var(--accent-cyan); }
.status-done { background: rgba(100, 116, 139, 0.18); color: var(--text-muted); }

/* Syllabus Courses Grid */
.course-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 16px;
  cursor: pointer;
  transition: var(--transition-smooth);
  backdrop-filter: blur(12px);
}

.course-card:hover {
  border-color: var(--border-focus);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.course-code-badge {
  font-family: var(--font-stem);
  font-size: 12px;
  font-weight: 700;
  background: rgba(30, 41, 59, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 2px 8px;
  border-radius: 6px;
  color: var(--accent-cyan);
}

.course-card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.course-name-ar {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 2px;
}

.course-name-en {
  font-family: var(--font-stem);
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

.course-stats-bar {
  display: flex;
  gap: 12px;
  font-size: 12px;
  color: var(--text-secondary);
  border-top: 1px solid var(--border-subtle);
  padding-top: 10px;
}

/* Anomaly Badges */
.badge-conflict {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.4);
  color: var(--accent-amber);
  border-radius: 6px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.badge-identity {
  background: rgba(148, 163, 184, 0.15);
  border: 1px solid rgba(148, 163, 184, 0.4);
  color: #cbd5e1;
  border-radius: 6px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

/* Course Modal Detail Overlay */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(3, 7, 18, 0.82);
  backdrop-filter: blur(16px);
  z-index: 100;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-sheet {
  background: #0f172a;
  border: 1px solid var(--border-subtle);
  border-top-left-radius: var(--radius-xl);
  border-top-right-radius: var(--radius-xl);
  width: 100%;
  max-width: 600px;
  max-height: 85vh;
  overflow-y: auto;
  padding: 24px 20px;
  box-shadow: 0 -8px 40px rgba(0, 0, 0, 0.6);
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-backdrop.open .modal-sheet {
  transform: translateY(0);
}

.modal-handle-bar {
  width: 40px;
  height: 4px;
  background: var(--text-muted);
  border-radius: 2px;
  margin: 0 auto 16px auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 16px;
}

.modal-close-btn {
  background: rgba(255, 255, 255, 0.08);
  border: none;
  color: var(--text-secondary);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.topic-item-card {
  background: rgba(30, 41, 59, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topic-week-chip {
  font-family: var(--font-stem);
  font-size: 11px;
  font-weight: 700;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Conflict Alert Box */
.conflict-alert-box {
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.35);
  border-radius: var(--radius-md);
  padding: 14px;
  margin-bottom: 16px;
  font-size: 13px;
  line-height: 1.6;
  color: #fef3c7;
}

/* Bottom Tab Navigation */
.bottom-nav-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 72px;
  background: rgba(15, 23, 42, 0.92);
  border-top: 1px solid var(--border-subtle);
  backdrop-filter: blur(20px);
  display: flex;
  justify-content: center;
  z-index: 50;
}

.bottom-nav-inner {
  width: 100%;
  max-width: 600px;
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 0 16px;
}

.nav-tab-btn {
  background: none;
  border: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px 16px;
  border-radius: var(--radius-md);
  transition: var(--transition-fast);
}

.nav-tab-btn .tab-icon {
  font-size: 20px;
}

.nav-tab-btn .tab-label {
  font-size: 11px;
  font-weight: 500;
}

.nav-tab-btn.active {
  color: var(--accent-cyan);
}

.nav-tab-btn.active .tab-icon {
  transform: translateY(-2px);
  filter: drop-shadow(0 0 8px rgba(56, 189, 248, 0.6));
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 44px;
  margin-bottom: 12px;
  opacity: 0.7;
}

/* Search Input */
.search-box-wrap {
  position: relative;
  margin-bottom: 8px;
}

.search-input {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  color: #fff;
  font-family: var(--font-arabic);
  font-size: 14px;
  outline: none;
  transition: var(--transition-fast);
}

.search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
}

.search-input::placeholder {
  color: var(--text-muted);
}

/* Rich Academic Modal Additions */
.guide-card-box {
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 14px;
  border: 1px solid var(--border-subtle);
  background: rgba(30, 41, 59, 0.45);
  backdrop-filter: blur(10px);
}

.guide-card-box.canonical {
  background: rgba(56, 189, 248, 0.07);
  border-color: rgba(56, 189, 248, 0.3);
}

.guide-card-box.strategy {
  background: rgba(16, 185, 129, 0.07);
  border-color: rgba(16, 185, 129, 0.3);
}

.guide-card-box.exam-tips {
  background: rgba(245, 158, 11, 0.08);
  border-color: rgba(245, 158, 11, 0.35);
}

.guide-card-box.formulas {
  background: rgba(168, 85, 247, 0.08);
  border-color: rgba(168, 85, 247, 0.3);
}

.guide-card-box.pre-semester {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.3);
}

.guide-card-title {
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  color: #fff;
}

.guide-card-content {
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-secondary);
}

.formula-tag {
  display: inline-block;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(168, 85, 247, 0.3);
  color: #e9d5ff;
  font-family: var(--font-stem);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 6px;
  margin-left: 6px;
  direction: ltr;
}