/* =========================
   Base Design Tokens
   ========================= */
:root {
  /* Brand */
  --primary-color: #0d6efd;
  --secondary-color: #6c757d;
  --success-color: #198754;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #0dcaf0;

  /* Light theme (default) */
  --bg: #f8f9fa;
  --text: #212529;
  --muted: #6c757d;
  --surface: #ffffff;
  --surface-2: #f8f9fa;
  --surface-3: #e9ecef;
  --border: #dee2e6;

  /* Shadows & radii */
  --border-radius: 0.375rem;
  --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
  --box-shadow-lg: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);

  /* Deprecated aliases (kept for compatibility) */
  --light-color: var(--bg);
  --dark-color: var(--text);
}

/* Dark scheme overrides – only variables switch.
   Component rules below only reference tokens above,
   so there are no selector-level conflicts anymore. */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #212529;
    --text: #f8f9fa;
    --muted: #adb5bd;
    --surface: #343a40;
    --surface-2: #495057;
    --surface-3: #6c757d;
    --border: #6c757d;

    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.3);
    --box-shadow-lg: 0 0.5rem 1rem rgba(0, 0, 0, 0.4);

    --light-color: #343a40;
    --dark-color: #f8f9fa;
  }
}

/* =========================
   Global Resets & Typography
   ========================= */
*,
*::before,
*::after { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto',
    'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  background-color: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.2;
  color: var(--text);
}

h1 { font-size: 2.5rem; font-weight: 700; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; font-weight: 500; }
h5 { font-size: 1.125rem; font-weight: 500; }
h6 { font-size: 1rem; font-weight: 500; }

p {
  margin-bottom: 1rem;
  line-height: 1.7;
  color: var(--text);
}

.lead {
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--text);
}

.text-muted { color: var(--muted) !important; }

/* =========================
   Navigation
   ========================= */
.navbar-brand {
  font-weight: 600;
  font-size: 1.25rem;
  letter-spacing: -0.025em;
  color: #fff;
}

.navbar-nav .nav-link {
  font-weight: 500;
  letter-spacing: 0.01em;
  color: #fff;
  transition: color 0.15s ease-in-out;
}

.navbar-nav .nav-link:hover {
  /* rgba(174, 184, 194, 0.9) !important */
  color: rgba(174, 184, 194, 0.9) !important;
}

/* =========================
   Cards
   ========================= */
.card {
  border: none;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  transition: box-shadow 0.15s ease-in-out, transform 0.15s ease-in-out;
  background-color: var(--surface);
  color: var(--text);
}

.card:hover {
  box-shadow: var(--box-shadow-lg);
}

.card-title {
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--text);
}

.card-text {
  line-height: 1.6;
  color: var(--text);
}

/* =========================
   Buttons
   ========================= */
.btn {
  border-radius: var(--border-radius);
  font-weight: 500;
  transition: all 0.15s ease-in-out;
  /*color: var(--text);*/
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1.1rem;
  font-weight: 500;
}

/* Outline variants—respect theme */
.btn-outline-secondary {
  color: var(--text);
  border-color: var(--border);
}
.btn-outline-secondary:hover {
  background-color: var(--surface-2);
  border-color: var(--border);
  color: var(--text);
}

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

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

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

.btn-outline-warning {
  color: var(--warning-color);
  border-color: var(--warning-color);
}
.btn-outline-warning:hover {
  background-color: var(--warning-color);
  border-color: var(--warning-color);
  color: #212529;
}

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

/* =========================
   Forms
   ========================= */
.form-label {
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text);
}

.form-control,
.form-select {
  font-weight: 400;
  letter-spacing: 0.01em;
  border-radius: var(--border-radius);
  border: 1px solid var(--border);
  background-color: var(--surface);
  color: var(--text);
  transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out, background-color 0.15s ease-in-out;
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
  background-color: var(--surface);
  color: var(--text);
}

/* =========================
   Tables
   ========================= */
.table {
  font-weight: 400;
  color: var(--text);
  background-color: var(--surface);
  border-color: var(--border);
}

.table th {
  font-weight: 600;
  letter-spacing: 0.025em;
  background-color: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}

.table td {
  background-color: var(--surface);
  color: var(--text);
  border-color: var(--border);
}

.table-striped tbody tr:nth-of-type(odd) {
  background-color: color-mix(in srgb, var(--text) 5%, transparent);
}

.table-hover tbody tr:hover {
  background-color: color-mix(in srgb, var(--text) 10%, transparent);
}

/* =========================
   Modals
   ========================= */
.modal-content {
  border: none;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow-lg);
  background-color: var(--surface);
  color: var(--text);
}

.modal-header {
  border-bottom: 1px solid var(--border);
  background-color: var(--surface-2);
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  color: var(--text);
}

.modal-title {
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--text);
}

.modal-body {
  background-color: var(--surface);
  color: var(--text);
}

.modal-footer {
  border-top: 1px solid var(--border);
  background-color: var(--surface-2);
  border-radius: 0 0 var(--border-radius) var(--border-radius);
}

.modal .form-label { color: var(--text); }
.modal .form-control,
.modal .form-select {
  background-color: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
}

.modal .form-control:focus,
.modal .form-select:focus {
  border-color: var(--primary-color);
  color: var(--text);
  box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

.modal .btn-close {
  background-color: transparent;
  border: none;
  opacity: 0.5;
}
.modal .btn-close:hover { opacity: 0.75; }

.modal .table { color: var(--text); }
.modal .table th {
  background-color: var(--surface-2);
  color: var(--text);
  font-weight: 600;
  border-color: var(--border);
}
.modal .table td {
  border-color: var(--border);
  color: var(--text);
}

/* =========================
   Alerts & Toasts
   ========================= */
.alert {
  font-weight: 400;
  line-height: 1.5;
  background-color: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
}

.alert strong { font-weight: 600; }

.alert-warning {
  background-color: color-mix(in srgb, var(--warning-color) 15%, var(--surface));
  border-color: color-mix(in srgb, var(--warning-color) 30%, var(--border));
  color: #856404;
}

.alert-danger {
  background-color: color-mix(in srgb, var(--danger-color) 12%, var(--surface));
  border-color: color-mix(in srgb, var(--danger-color) 30%, var(--border));
  color: #721c24;
}

.alert-success {
  background-color: color-mix(in srgb, var(--success-color) 12%, var(--surface));
  border-color: color-mix(in srgb, var(--success-color) 30%, var(--border));
  color: #109556;
}

.alert-info {
  background-color: color-mix(in srgb, var(--info-color) 12%, var(--surface));
  border-color: color-mix(in srgb, var(--info-color) 30%, var(--border));
  color: #1c9fb9;
}

.toast {
  border: 1px solid var(--border);
  box-shadow: var(--box-shadow-lg);
  background-color: var(--surface);
  color: var(--text);
}
.toast-header {
  background-color: var(--surface-2);
  border-bottom: 1px solid var(--border);
  color: var(--text);
}
.toast-body {
  background-color: var(--surface);
  color: var(--text);
}

/* =========================
   Dropdowns / Autocomplete
   ========================= */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 1000;
  display: none;
  min-width: 100%;
  padding: 0.5rem 0;
  margin: 0.125rem 0 0;
  font-size: 1rem;
  color: var(--text);
  text-align: left;
  list-style: none;
  background-color: var(--surface);
  background-clip: padding-box;
  border: 1px solid color-mix(in srgb, var(--text) 15%, transparent);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow-lg);
}

.dropdown-item {
  display: block;
  width: 100%;
  padding: 0.25rem 1rem;
  clear: both;
  font-weight: 400;
  color: var(--text);
  text-align: inherit;
  text-decoration: none;
  white-space: nowrap;
  background-color: transparent;
  border: 0;
  cursor: pointer;
}

.dropdown-item:hover,
.dropdown-item:focus {
  color: var(--text);
  background-color: color-mix(in srgb, var(--text) 8%, transparent);
}

.dropdown-item.active,
.dropdown-item:active {
  color: #fff;
  background-color: var(--primary-color);
}

/* =========================
   Layout Utilities
   ========================= */
.container-fluid {
  background: transparent;
}

.mb-3 { position: relative; }

/* =========================
   Schedule / Timetable
   ========================= */
.schedule-container {
  background: var(--surface);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  overflow: hidden;
  color: var(--text);
}

.day-block {
  border-bottom: 1px solid var(--border);
  transition: background-color 0.15s ease-in-out;
}
.day-block:hover { background-color: var(--surface-2); }
.day-block:last-child { border-bottom: none; }

.day-header {
  background: linear-gradient(135deg, var(--primary-color), #0056b3);
  color: #fff;
  padding: 1rem;
  font-weight: 600;
  font-size: 1.1rem;
}

.day-content {
  padding: 1rem;
  background-color: var(--surface);
  color: var(--text);
}

.slot-item {
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--text) 10%, transparent);
  border-radius: var(--border-radius);
  margin-bottom: 0.5rem;
  padding: 0.75rem;
  transition: all 0.15s ease-in-out;
  color: var(--text) !important;
}
.slot-item:hover {
  border-color: var(--primary-color);
  box-shadow: var(--box-shadow);
}
.slot-item.current {
  border-color: var(--success-color);
  background-color: color-mix(in srgb, var(--success-color) 8%, var(--surface));
}
.slot-item.past {
  opacity: 0.85;
  background-color: var(--surface-2);
}

.slot-time {
  font-weight: 600;
  color: var(--primary-color);
  font-size: 0.9rem;
}

.slot-lesson { margin-top: 0.5rem; }

.lesson-item {
  background: var(--surface-2);
  color: var(--text);
  border-radius: calc(var(--border-radius) / 2);
  padding: 0.5rem;
  margin-bottom: 0.25rem;
  border-left: 3px solid var(--primary-color);
}
.lesson-item.canceled {
  border-left-color: var(--danger-color);
  background-color: color-mix(in srgb, var(--danger-color) 10%, var(--surface));
  opacity: 0.9;
}
.lesson-item.moved {
  border-left-color: var(--warning-color);
  background-color: color-mix(in srgb, var(--warning-color) 12%, var(--surface));
}

.lesson-subject { font-weight: 600; color: var(--text); }
.lesson-teacher { color: var(--muted); font-size: 0.9rem; }
.lesson-room { color: var(--info-color); font-size: 0.85rem; }

.lesson-subgroup {
  background: var(--primary-color);
  color: #fff;
  padding: 0.1rem 0.4rem;
  border-radius: 0.2rem;
  font-size: 0.75rem;
  font-weight: 600;
}

.lesson-grades {
  margin-top: 0.5rem;
  font-size: 0.875rem;
}
.lesson-grades .badge {
  font-size: 0.75rem;
  cursor: help;
}

/* =========================
   Filters / Panels
   ========================= */
.filter-section {
  background: var(--surface);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  padding: 1rem;
  margin-bottom: 1rem;
  color: var(--text);
}

.filter-row {
  display: flex;
  gap: 1rem;
  align-items: end;
  flex-wrap: wrap;
}

.filter-group {
  flex: 1;
  min-width: 200px;
}

/* =========================
   Conflicts
   ========================= */
.conflict-alert {
  background: color-mix(in srgb, var(--warning-color) 18%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--warning-color) 35%, var(--border));
  border-radius: var(--border-radius);
  padding: 0.75rem;
  margin-bottom: 1rem;
  color: #856404;
}

.conflict-item {
  background: color-mix(in srgb, var(--danger-color) 14%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--danger-color) 28%, var(--border));
  border-radius: calc(var(--border-radius) / 2);
  padding: 0.5rem;
  margin-bottom: 0.25rem;
  color: #721c24;
}

/* =========================
   Loading
   ========================= */
.loading {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 2rem;
}

.spinner-border {
  width: 3rem;
  height: 3rem;
}

/* =========================
   Empty State
   ========================= */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--muted);
}

.empty-state i {
  font-size: 4rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* =========================
   Status Badges
   ========================= */
.status-badge {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border-radius: 0.2rem;
  font-weight: 600;
}

.status-planned {
  background: color-mix(in srgb, var(--info-color) 20%, var(--surface));
  color: color-mix(in srgb, var(--info-color) 80%, #003845);
}

.status-canceled {
  background: color-mix(in srgb, var(--danger-color) 20%, var(--surface));
  color: color-mix(in srgb, var(--danger-color) 80%, #3f0000);
}

.status-moved {
  background: color-mix(in srgb, var(--warning-color) 20%, var(--surface));
  color: color-mix(in srgb, var(--warning-color) 80%, #3a2b00);
}

/* =========================
   Grades Table
   ========================= */
.grades-table {
  font-size: 0.875rem;
}
.grades-table th {
  font-size: 0.8rem;
  padding: 0.5rem 0.25rem;
  vertical-align: middle;
}
.grades-table td {
  padding: 0.25rem;
  vertical-align: middle;
}
.grades-table .form-select-sm {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
}
.grades-table .fw-bold { font-size: 0.8rem; }

/* =========================
   Journal Table
   ========================= */
.journal-table {
  font-size: 0.875rem;
  background-color: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.journal-table th {
  font-size: 0.8rem;
  padding: 0.5rem 0.25rem;
  vertical-align: middle;
  background-color: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}
.journal-table td {
  padding: 0.25rem;
  vertical-align: middle;
  background-color: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.journal-table .student-column {
  min-width: 150px;
  position: sticky;
  left: 0;
  background-color: var(--surface-2);
  z-index: 10;
}
.journal-table .lesson-header {
  min-width: 120px;
  max-width: 120px;
}
.journal-table .lesson-info { margin-bottom: 0.25rem; }
.journal-table .lesson-date {
  font-weight: bold;
  font-size: 0.75rem;
}
.journal-table .lesson-number {
  font-size: 0.7rem;
  color: var(--muted);
}
.journal-table .lesson-time {
  font-size: 0.65rem;
  color: var(--muted);
}
.journal-table .lesson-actions { margin-top: 0.25rem; }
.journal-table .student-name {
  font-size: 0.8rem;
  padding: 0.5rem;
  position: sticky;
  left: 0;
  background-color: var(--surface);
  z-index: 5;
  border-right: 2px solid var(--border);
}
.journal-table .grade-cell {
  min-width: 60px;
  max-width: 60px;
  height: 40px;
}
.journal-table .grade-badge {
  cursor: pointer;
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
}
.journal-table .add-grade-btn {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  width: 100%;
  height: 100%;
}

/* =========================
   Animations
   ========================= */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeIn 0.3s ease-in-out; }

/* =========================
   Responsive
   ========================= */
@media (max-width: 768px) {
  .container-fluid {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .btn-lg {
    padding: 0.5rem 1rem;
    font-size: 1rem;
  }

  .display-1 { font-size: 3rem; }

  /* Week nav buttons on mobile */
  .btn-group .btn {
    font-size: 0.875rem;
    padding: 0.375rem 0.75rem;
  }
  .btn-group .btn i {
    font-size: 0.75rem;
  }
}

/* =========================
   Helper: Show dropdowns when toggled
   (leave JS to add .show)
   ========================= */
.dropdown-menu.show { display: block; }