@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=Playfair+Display:ital,wght@0,600;0,700;1,600&display=swap');

/* Default Theme: Light */
:root {
  --primary-color: #059669; /* Dynamic Emerald Green default */
  --primary-hover: #047857;
  --bg-color: #f8fafc;
  --bg-gradient: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 100%);
  --card-bg: rgba(255, 255, 255, 0.85);
  --text-color: #0f172a;
  --text-muted: #64748b;
  --border-color: rgba(226, 232, 240, 0.8);
  --input-bg: #ffffff;
  --glass-blur: blur(12px);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 15px 40px rgba(0, 0, 0, 0.12);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
}

/* Dark Theme */
[data-theme="dark"] {
  --bg-color: #090d16;
  --bg-gradient: linear-gradient(135deg, #090d16 0%, #111827 100%);
  --card-bg: rgba(17, 24, 39, 0.7);
  --text-color: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: rgba(51, 65, 85, 0.5);
  --input-bg: #1e293b;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 15px 40px rgba(0, 0, 0, 0.6);
}

/* General Resets */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Plus Jakarta Sans', sans-serif;
  background: var(--bg-gradient);
  color: var(--text-color);
  min-height: 100vh;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  transition: background 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* Navigation / Header */
header {
  backdrop-filter: var(--glass-blur);
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
}

header nav button,
header nav a {
  white-space: nowrap;
}

/* Glassmorphism Containers */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

/* Typography */
h1 {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -1px;
}

h2 {
  font-size: 1.8rem;
  font-weight: 700;
}

h3 {
  font-size: 1.3rem;
  font-weight: 600;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
  color: white;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
  transform: scale(1.02);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
  background: var(--input-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--border-color);
}

.btn-danger {
  background: #ef4444;
  color: white;
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-sm {
  padding: 0.35rem 0.7rem;
  font-size: 0.8rem;
}

/* Forms & Inputs */
.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-family: inherit;
  background: var(--input-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.15);
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  margin-top: 1.5rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th, td {
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
}

tbody tr {
  transition: background-color 0.2s ease;
}

tbody tr:hover {
  background-color: rgba(5, 150, 105, 0.03) !important;
}

tbody tr:nth-child(even) {
  background-color: rgba(0, 0, 0, 0.015);
}

th {
  background: rgba(0, 0, 0, 0.02);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 700;
}

[data-theme="dark"] th {
  background: rgba(255, 255, 255, 0.02);
}

/* ==========================================================================
   DARK MODE OVERRIDES for Tailwind utility classes used in admin/teacher pages
   ========================================================================== */
[data-theme="dark"] {
  --tw-bg-opacity: 1;
  --tw-text-opacity: 1;
  --tw-border-opacity: 1;
  --tw-divide-opacity: 1;
}

[data-theme="dark"] .bg-white,
[data-theme="dark"] .bg-white\/80 {
  background-color: var(--card-bg) !important;
}

[data-theme="dark"] .bg-gray-50,
[data-theme="dark"] .bg-gray-50\/50,
[data-theme="dark"] .bg-gray-50\/20,
[data-theme="dark"] .bg-gray-50\/40,
[data-theme="dark"] .hover\:bg-gray-50:hover,
[data-theme="dark"] .hover\:bg-gray-50\/50:hover,
[data-theme="dark"] .hover\:bg-emerald-50\/20:hover,
[data-theme="dark"] .hover\:bg-emerald-50\/10:hover,
[data-theme="dark"] .even\:bg-gray-50:nth-child(even) {
  background-color: rgba(30, 41, 59, 0.8) !important;
}

[data-theme="dark"] .bg-emerald-50,
[data-theme="dark"] .bg-emerald-50\/50,
[data-theme="dark"] .bg-red-50,
[data-theme="dark"] .bg-amber-50 {
  background-color: rgba(30, 41, 59, 0.6) !important;
}

[data-theme="dark"] .text-gray-700,
[data-theme="dark"] .text-gray-800,
[data-theme="dark"] .text-gray-900 {
  color: #e2e8f0 !important;
}

[data-theme="dark"] .text-gray-500,
[data-theme="dark"] .text-gray-600 {
  color: #94a3b8 !important;
}

[data-theme="dark"] .text-gray-400 {
  color: #64748b !important;
}

[data-theme="dark"] .border-gray-100,
[data-theme="dark"] .border-gray-200 {
  border-color: rgba(51, 65, 85, 0.5) !important;
}

[data-theme="dark"] .divide-gray-100 > :not([hidden]) ~ :not([hidden]) {
  border-color: rgba(51, 65, 85, 0.5) !important;
}

[data-theme="dark"] .shadow-sm {
  box-shadow: var(--shadow-sm) !important;
}

[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
  background-color: var(--input-bg) !important;
  border-color: rgba(51, 65, 85, 0.5) !important;
  color: var(--text-color) !important;
}

[data-theme="dark"] .text-primary {
  color: var(--primary-color) !important;
}

[data-theme="dark"] .text-red-600,
[data-theme="dark"] .text-red-700,
[data-theme="dark"] .hover\:text-red-700:hover {
  color: #f87171 !important;
}

[data-theme="dark"] .text-amber-600 {
  color: #fbbf24 !important;
}

[data-theme="dark"] .bg-white\/95 {
  background-color: rgba(17, 24, 39, 0.95) !important;
}

[data-theme="dark"] .hover\:bg-gray-50:hover {
  background-color: rgba(30, 41, 59, 0.8) !important;
}

[data-theme="dark"] .hover\:bg-red-50:hover {
  background-color: rgba(127, 29, 29, 0.4) !important;
}

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

/* Modal */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

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

.modal-content {
  width: 90%;
  max-width: 500px;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform 0.3s ease;
}

.modal.active .modal-content {
  transform: translateY(0);
}

/* Layouts (Grid/Flex) */
.container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1rem;
  flex: 1;
  min-width: 0;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
}

/* Loading Spinner */
.spinner {
  border: 3px solid rgba(0, 0, 0, 0.1);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border-left-color: var(--primary-color);
  animation: spin 1s linear infinite;
  display: inline-block;
  vertical-align: middle;
}

[data-theme="dark"] .spinner {
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-left-color: var(--primary-color);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Notification Bar */
.notification {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 1rem 1.5rem;
  border-radius: var(--radius-sm);
  color: white;
  font-weight: 600;
  box-shadow: var(--shadow-md);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 10000;
}

.notification.show {
  transform: translateY(0);
  opacity: 1;
}

.notification.success { background: #059669; }
.notification.error { background: #ef4444; }

/* Custom components */
.accent-border {
  border-left: 4px solid var(--primary-color);
  padding-left: 1rem;
}

/* Drag-Drop Zone */
.dropzone {
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  padding: 2.5rem 1.5rem;
  text-align: center;
  background: rgba(255, 255, 255, 0.02);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.dropzone::before {
  content: '📤';
  font-size: 2.5rem;
  margin-bottom: 0.25rem;
  transition: transform 0.3s ease;
}

.dropzone:hover {
  border-color: var(--primary-color);
  background: rgba(5, 150, 105, 0.03);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.dropzone:hover::before {
  transform: scale(1.1);
}

/* ==========================================================================
   COMPREHENSIVE MOBILE RESPONSIVENESS FIXES
   ========================================================================== */

@media (max-width: 768px) {
  /* Container padding */
  .container {
    padding: 1rem 0.75rem;
  }

  /* Header: stack content vertically */
  header {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  /* Admin Sidebar layout: stacked */
  .admin-layout {
    grid-template-columns: 1fr !important;
    gap: 1rem;
  }

  .sidebar {
    padding: 0.75rem;
  }

  .sidebar-menu {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.25rem;
  }

  .menu-item {
    padding: 0.45rem 0.7rem;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
    text-align: center;
  }

  /* Teacher grid: stacked */
  .teacher-grid {
    grid-template-columns: 1fr !important;
  }

  /* Landing Page hero */
  .hero-title {
    font-size: 1.75rem;
  }

  /* Search box stacked */
  .search-box {
    flex-direction: column;
    background: transparent;
    border: none;
    padding: 0;
    box-shadow: none;
  }

  .search-box input {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    padding: 0.75rem 1rem;
    width: 100%;
  }

  .search-box button {
    width: 100%;
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
  }

  /* Grids collapse to 1 col */
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  /* Modal: nearly full-screen on mobile */
  .modal-content {
    width: 96%;
    max-width: 96%;
    padding: 1.25rem;
    max-height: 90vh;
    overflow-y: auto;
  }

  /* Glass card padding */
  .glass-card {
    padding: 1.25rem;
  }

  /* Session cards */
  .session-card {
    padding: 1rem;
  }

  /* Inline flex groups on session cards: stack vertically */
  .session-card .btn {
    width: 100%;
    margin-top: 0.4rem;
  }

  /* Heading sizes */
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.4rem; }

  /* Toggle group: wrap */
  .toggle-group {
    width: 100%;
    flex-wrap: wrap;
  }

  .toggle-option {
    flex: 1;
    text-align: center;
    font-size: 0.8rem;
    padding: 0.45rem 0.5rem;
  }

  /* Table: ensure horizontal scroll works */
  .table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  table {
    min-width: 500px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0.75rem 0.5rem;
  }

  .btn {
    padding: 0.55rem 0.9rem;
    font-size: 0.82rem;
  }

  .glass-card {
    padding: 1rem;
  }

  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }
  h3 { font-size: 1.05rem; }

  .modal-content {
    padding: 1rem;
    width: 98%;
    max-width: 98%;
  }
}

/* Toggle Pill Selector */
.toggle-group {
  display: flex;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.25rem;
  gap: 0.25rem;
  width: fit-content;
}

.toggle-option {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: calc(var(--radius-sm) - 0.15rem);
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s ease;
}

.toggle-option.active {
  background: var(--primary-color);
  color: white;
}

/* Preset Colors Selector */
.color-presets {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.color-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.2s ease;
}

.color-dot:hover {
  transform: scale(1.15);
}

.color-dot.active {
  border-color: var(--text-color);
  transform: scale(1.1);
}

.location-section {
  max-width: 800px;
  margin: 3rem auto;
  padding: 0 1rem;
}

.location-card {
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
}

.location-header {
  margin-bottom: 1rem;
}

.location-header h2 {
  margin-bottom: 0.25rem;
  background: linear-gradient(135deg, var(--primary-color) 0%, #d97706 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

.location-address {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.map-container {
  border-radius: var(--radius-sm);
  overflow: hidden;
}

@media (max-width: 640px) {
  .location-section {
    margin: 2rem auto;
  }
  .location-card {
    padding: 1rem;
  }
  .map-container iframe {
    height: 250px;
  }
}