/* ============================================
   FONT IMPORT (MUST BE FIRST)
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ============================================
   1. CSS VARIABLES (Design Tokens)
   ============================================ */
:root {
  /* Primary Colors */
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --primary-200: #c7d2fe;
  --primary-300: #a5b4fc;
  --primary-400: #818cf8;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;
  --primary-800: #3730a3;
  --primary-900: #312e81;

  /* Neutral Colors */
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  /* Semantic */
  --success-light: #dcfce7;
  --success: #22c55e;
  --success-dark: #16a34a;
  --error-light: #fee2e2;
  --error: #ef4444;
  --error-dark: #dc2626;
  --warning-light: #fef3c7;
  --warning: #f59e0b;
  --warning-dark: #d97706;
  --info-light: #dbeafe;
  --info: #3b82f6;
  --info-dark: #2563eb;

  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

/* ============================================
   2. RESET & BASE
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font-family);
  line-height: 1.6;
  background: linear-gradient(135deg, var(--gray-900), var(--primary-900));
  color: var(--gray-100);
  min-height: 100vh;
}

/* ============================================
   3. FORMS & INPUTS (FIXED CONTRAST)
   ============================================ */
.form-group {
  margin-bottom: var(--space-5);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--gray-400);
}

.card .form-group label,
.auth-container .form-group label {
  color: var(--gray-700);
}

input, select, textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-family);
  background: var(--gray-50);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary-500);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
  background: white;
}

/* ============================================
   4. SIDEBAR (BACKDROP FALLBACK)
   ============================================ */
.sidebar {
  background: rgba(15, 23, 42, 0.97);
}

@supports (backdrop-filter: blur(20px)) {
  .sidebar {
    backdrop-filter: blur(20px);
    background: rgba(15, 23, 42, 0.85);
  }
}

/* ============================================
   5. TABLES (STICKY FIX)
   ============================================ */
th {
  font-weight: 600;
}

.card th {
  position: static;
}

/* ============================================
   6. MODAL OVERFLOW FIX
   ============================================ */
.modal-content {
  max-height: 90vh;
  overflow-y: auto;
  overscroll-behavior: contain;
}

/* ============================================
   7. FOCUS ACCESSIBILITY FIX
   ============================================ */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
}

/* ============================================
   8. REDUCED MOTION SUPPORT
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

/* ============================================
   9. BUTTONS
   ============================================ */
button {
  appearance: none;
  border: none;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: 600;
  color: white;
  background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
}

button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
  filter: brightness(1.02);
}

button:active {
  transform: translateY(0);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

.small-btn {
  padding: 10px 14px;
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
}

/* ============================================
   10. AUTH PAGE
   ============================================ */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
}

.auth-container {
  width: 100%;
  max-width: 420px;
  background: rgba(255, 255, 255, 0.98);
  color: var(--gray-900);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.auth-container h1 {
  margin: 0 0 var(--space-2);
  font-size: var(--font-size-3xl);
  line-height: 1.2;
}

.subtitle {
  margin: 0 0 var(--space-8);
  color: var(--gray-600);
  font-size: var(--font-size-sm);
}

.auth-container button {
  width: 100%;
}

.error-msg {
  margin: var(--space-3) 0 0;
  font-size: var(--font-size-sm);
  color: var(--error-dark);
}

/* ============================================
   11. APP LAYOUT (SIDEBAR + CONTENT)
   ============================================ */
.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 260px;
  height: 100vh;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  overflow: hidden;
}

.sidebar h2 {
  margin: 0;
  font-size: var(--font-size-xl);
  letter-spacing: 0.2px;
}

.sidebar-content {
  flex: 1;
  overflow: auto;
  padding-right: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.sidebar-btn {
  width: 100%;
  text-align: left;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.10);
  color: var(--gray-100);
  padding: 10px 12px;
  border-radius: var(--radius-md);
  box-shadow: none;
  transform: none;
}

.sidebar-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.16);
  box-shadow: none;
  transform: none;
}

.sidebar-btn.active {
  background: rgba(99, 102, 241, 0.18);
  border-color: rgba(99, 102, 241, 0.35);
}

#logoutBtn {
  width: 100%;
  background: linear-gradient(135deg, var(--error), var(--error-dark));
}

.main-content {
  margin-left: 260px;
  min-height: 100vh;
  padding: var(--space-8);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
}

/* ============================================
   12. CARDS / GRID / TABLES
   ============================================ */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-4);
}

/* Dashboard specific 6-card layout */
#adminStats.cards {
  grid-template-columns: repeat(6, 1fr);
}

@media (max-width: 1200px) {
  #adminStats.cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  #adminStats.cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

.card {
  background: rgba(30, 30, 35, 0.96);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.card h3 {
  font-size: 0.9rem;
  margin: 0;
}

.card h4,
.card h5 {
  margin-top: 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-6);
  align-items: start;
}

label {
  display: inline-block;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--gray-300);
}

.card label {
  color: var(--gray-700);
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--gray-200);
}

thead th {
  background: var(--gray-100);
  color: var(--gray-700);
  text-align: left;
}

tbody tr:hover {
  background: rgba(99, 102, 241, 0.06);
}

table.card {
  padding: 0;
}

table.card th,
table.card td {
  padding: 12px 14px;
}

#timeTable {
  background: rgba(255, 255, 255, 0.96);
  color: var(--gray-900);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  width: 100%;
}

#timeTable th {
  background: rgba(99, 102, 241, 0.15);
  color: var(--gray-900);
  font-weight: 600;
  font-size: 0.85rem;
  text-align: center;
}

#timeTable td {
  vertical-align: top;
  text-align: center;
  padding: 8px;
}

#timeTable .timetable-cell {
  background: rgba(99, 102, 241, 0.08);
  border-radius: 6px;
  padding: 8px;
}

#timeTable .course-code {
  font-weight: 700;
  color: #4f46e5;
  font-size: 0.9rem;
}

#timeTable .course-name {
  font-size: 0.75rem;
  color: #666;
  margin-top: 2px;
}

#timeTable .room {
  font-size: 0.7rem;
  color: #888;
  margin-top: 4px;
}

#timeTable .section {
  font-size: 0.65rem;
  color: #999;
  margin-top: 2px;
  text-transform: uppercase;
}

/* ============================================
   13. MODAL
   ============================================ */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  z-index: 50;
}

.modal-content {
  width: min(900px, 100%);
  background: rgba(255, 255, 255, 0.98);
  color: var(--gray-900);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.35);
  position: relative;
}

.modal-body {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: var(--space-6);
  padding: var(--space-6);
}

.close-btn {
  position: absolute;
  right: 14px;
  top: 10px;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  color: var(--gray-500);
  user-select: none;
}

.close-btn:hover {
  color: var(--gray-800);
}

.attendance-summary {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.summary-item {
  padding: 6px 10px;
  background: var(--gray-100);
  color: var(--gray-800);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
}

@media (max-width: 900px) {
  .sidebar {
    position: static;
    width: auto;
    height: auto;
    border-radius: 0;
  }

  .main-content {
    margin-left: 0;
    padding: var(--space-6);
  }
}

@media (max-width: 720px) {
  .auth-container {
    padding: var(--space-8);
  }

  .modal-body {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   QR SCANNER STYLES
   ============================================ */
#qrReader {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--gray-800);
}

#qrReader video {
  border-radius: var(--radius-lg);
}

#qrReader img {
  display: none !important;
}

#qrReader__scan_region {
  background: transparent !important;
}

#qrReader__dashboard_section {
  padding: var(--space-2) !important;
}

#qrReader__dashboard_section_csr button {
  background: var(--primary-600) !important;
  color: white !important;
  border: none !important;
  padding: var(--space-2) var(--space-4) !important;
  border-radius: var(--radius-md) !important;
  cursor: pointer !important;
  font-size: var(--font-size-sm) !important;
}

#qrReader__dashboard_section_csr button:hover {
  background: var(--primary-700) !important;
}

#qrReader__dashboard_section_csr select {
  background: var(--gray-700) !important;
  color: white !important;
  border: 1px solid var(--gray-600) !important;
  padding: var(--space-2) !important;
  border-radius: var(--radius-md) !important;
  margin: var(--space-2) !important;
}

#qrReader__status_span {
  color: var(--gray-300) !important;
  font-size: var(--font-size-sm) !important;
}