/* ─── CSS Variables ──────────────────────────────────────────────────────────── */
:root {
  --color-bg: #EAEBD8;
  --color-primary: #7A8A6A;
  --color-primary-dark: #637057;
  --color-text: #2C2C2C;
  --color-light: #F5F5EE;
  --color-border: #C8C9B8;
  --color-muted: #888;
  --color-danger: #c0392b;
  --color-success: #27ae60;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
}

/* ─── Reset & Base ───────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: Georgia, serif;
  font-weight: normal;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ─── Auth Pages ─────────────────────────────────────────────────────────────── */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  padding: 20px;
}

.auth-card {
  background: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 48px 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow);
  text-align: center;
}

.auth-card .brand {
  font-family: Georgia, serif;
  font-size: 42px;
  color: var(--color-primary);
  letter-spacing: 6px;
  margin-bottom: 4px;
}

.auth-card .tagline {
  font-style: italic;
  color: var(--color-muted);
  font-size: 14px;
  margin-bottom: 32px;
}

/* ─── Forms ──────────────────────────────────────────────────────────────────── */
.form-group {
  margin-bottom: 16px;
  text-align: left;
}

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 5px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: Arial, sans-serif;
  font-size: 15px;
  background: var(--color-light);
  color: var(--color-text);
  transition: border-color 0.2s;
  outline: none;
}

input:focus, textarea:focus, select:focus {
  border-color: var(--color-primary);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

/* ─── Buttons ────────────────────────────────────────────────────────────────── */
.btn {
  display: inline-block;
  padding: 11px 24px;
  border: none;
  border-radius: var(--radius);
  font-family: Arial, sans-serif;
  font-size: 14px;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
  text-decoration: none;
  text-align: center;
}

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

.btn-primary:hover { background: var(--color-primary-dark); text-decoration: none; }

.btn-secondary {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.btn-secondary:hover { background: var(--color-bg); text-decoration: none; }

.btn-danger {
  background: transparent;
  color: var(--color-danger);
  border: 1px solid var(--color-danger);
}

.btn-danger:hover { background: #fdf0ef; text-decoration: none; }

.btn-sm {
  padding: 6px 14px;
  font-size: 13px;
}

.btn-full { width: 100%; }

.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ─── Messages ───────────────────────────────────────────────────────────────── */
.message {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 16px;
  font-size: 14px;
}

.message-error {
  background: #fdf0ef;
  color: var(--color-danger);
  border: 1px solid #f5c6c2;
}

.message-success {
  background: #edf7f1;
  color: var(--color-success);
  border: 1px solid #b8e0c8;
}

/* ─── Header ─────────────────────────────────────────────────────────────────── */
.header {
  background: var(--color-light);
  border-bottom: 1px solid var(--color-border);
  padding: 0 32px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-brand {
  font-family: Georgia, serif;
  font-size: 22px;
  color: var(--color-primary);
  letter-spacing: 4px;
  text-decoration: none;
}

.header-user {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 14px;
  color: var(--color-muted);
}

.header-user .user-name {
  color: var(--color-text);
  font-weight: bold;
}

/* ─── Dashboard Layout ───────────────────────────────────────────────────────── */
.dashboard-layout {
  display: flex;
  min-height: calc(100vh - 60px);
}

.sidebar {
  width: 240px;
  min-width: 240px;
  background: var(--color-light);
  border-right: 1px solid var(--color-border);
  padding: 24px 0;
  overflow-y: auto;
}

.sidebar-title {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-muted);
  padding: 0 20px 12px;
}

.sidebar-item {
  display: block;
  padding: 10px 20px;
  color: var(--color-text);
  font-size: 14px;
  cursor: pointer;
  transition: background 0.15s;
  border-left: 3px solid transparent;
  text-decoration: none;
}

.sidebar-item:hover {
  background: var(--color-bg);
  text-decoration: none;
}

.sidebar-item.active {
  background: var(--color-bg);
  border-left-color: var(--color-primary);
  color: var(--color-primary);
  font-weight: bold;
}

.main-content {
  flex: 1;
  padding: 40px;
  overflow-y: auto;
}

.main-title {
  font-family: Georgia, serif;
  font-size: 28px;
  color: var(--color-text);
  margin-bottom: 28px;
}

/* ─── Lesson Cards ───────────────────────────────────────────────────────────── */
.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.lesson-card {
  background: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  cursor: pointer;
  transition: box-shadow 0.2s, transform 0.15s;
  text-decoration: none;
  color: var(--color-text);
  display: block;
}

.lesson-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
  text-decoration: none;
}

.lesson-card-title {
  font-family: Georgia, serif;
  font-size: 17px;
  margin-bottom: 8px;
  color: var(--color-text);
}

.lesson-card-desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
}

.lesson-card-footer {
  margin-top: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
}

.badge-watched {
  background: #edf7f1;
  color: var(--color-success);
  border: 1px solid #b8e0c8;
  border-radius: 20px;
  padding: 2px 10px;
  font-size: 12px;
}

.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--color-muted);
}

.empty-state h3 {
  font-family: Georgia, serif;
  font-size: 22px;
  margin-bottom: 8px;
  color: var(--color-primary);
}

/* ─── Search Bar ─────────────────────────────────────────────────────────────── */
.search-bar {
  margin-bottom: 20px;
}

.search-input {
  width: 100%;
  padding: 10px 16px;
  border: 1px solid var(--color-border);
  border-radius: 24px;
  font-family: Arial, sans-serif;
  font-size: 14px;
  background: var(--color-light);
  color: var(--color-text);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(122, 138, 106, 0.15);
}

/* ─── Sidebar Toggle (mobile only) ───────────────────────────────────────────── */
.sidebar-toggle {
  display: none;
}

/* ─── Sidebar Item Novelties ─────────────────────────────────────────────────── */
.sidebar-item--novelties {
  color: var(--color-primary);
  font-weight: bold;
}

.sidebar-item--novelties.active {
  border-left-color: var(--color-primary);
  background: var(--color-bg);
}

/* ─── Section Badge ──────────────────────────────────────────────────────────── */
.badge-section {
  background: var(--color-bg);
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 2px 10px;
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 150px;
  display: inline-block;
}

/* ─── Lesson Page ────────────────────────────────────────────────────────────── */
.lesson-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 32px 24px;
}

.lesson-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--color-muted);
  font-size: 14px;
  margin-bottom: 24px;
  text-decoration: none;
}

.lesson-back:hover { color: var(--color-primary); text-decoration: none; }

.video-wrapper {
  position: relative;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 28px;
}

.video-wrapper iframe {
  width: 100%;
  aspect-ratio: 16/9;
  border: none;
  display: block;
}

.video-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.lesson-title {
  font-family: Georgia, serif;
  font-size: 26px;
  margin-bottom: 12px;
}

.lesson-description {
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 28px;
}

.lesson-files {
  background: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
}

.lesson-files h4 {
  font-family: Georgia, serif;
  font-size: 16px;
  margin-bottom: 12px;
}

.file-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
}

.file-item:last-child { border-bottom: none; }

.file-icon { font-size: 18px; }

/* ─── Admin ──────────────────────────────────────────────────────────────────── */
.admin-layout {
  display: flex;
  min-height: calc(100vh - 60px);
}

.admin-sidebar {
  width: 200px;
  min-width: 200px;
  background: var(--color-light);
  border-right: 1px solid var(--color-border);
  padding: 24px 0;
}

.admin-nav-item {
  display: block;
  padding: 12px 20px;
  font-size: 14px;
  color: var(--color-text);
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background 0.15s;
  text-decoration: none;
}

.admin-nav-item:hover { background: var(--color-bg); text-decoration: none; }
.admin-nav-item.active {
  border-left-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-bg);
  font-weight: bold;
}

.admin-content {
  flex: 1;
  padding: 32px;
  overflow-y: auto;
}

.admin-tab { display: none; }
.admin-tab.active { display: block; }

.section-title {
  font-family: Georgia, serif;
  font-size: 22px;
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
}

/* ─── Tables ─────────────────────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-light);
  border-radius: var(--radius);
  overflow: hidden;
}

thead th {
  background: var(--color-bg);
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-muted);
  border-bottom: 1px solid var(--color-border);
}

tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  vertical-align: top;
}

tbody tr:last-child td { border-bottom: none; }
tbody tr:hover { background: var(--color-bg); }

/* ─── User Access Checkboxes ─────────────────────────────────────────────────── */
.access-checkboxes {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0;
}

.access-checkbox {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 12px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 4px 10px;
  cursor: pointer;
  transition: background 0.15s;
}

.access-checkbox:hover { background: var(--color-border); }
.access-checkbox input { cursor: pointer; accent-color: var(--color-primary); }

/* ─── Admin Lesson Form ───────────────────────────────────────────────────────── */
.admin-panel {
  background: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}

.admin-panel h3 {
  font-family: Georgia, serif;
  font-size: 18px;
  margin-bottom: 20px;
}

.form-hint {
  font-size: 12px;
  color: var(--color-muted);
  margin-top: 4px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.lessons-list {
  list-style: none;
}

.lesson-list-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 8px;
  font-size: 14px;
}

.lesson-list-item-info { flex: 1; }
.lesson-list-item-title { font-weight: bold; margin-bottom: 2px; }
.lesson-list-item-sub { font-size: 12px; color: var(--color-muted); }
.lesson-list-item-actions { display: flex; gap: 8px; }

/* ─── File list in admin ─────────────────────────────────────────────────────── */
.file-list-admin {
  list-style: none;
  margin: 8px 0;
}

.file-list-admin li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 13px;
}

.file-list-admin li:last-child { border-bottom: none; }

/* ─── Stats ──────────────────────────────────────────────────────────────────── */
.stats-detail {
  background: var(--color-light);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 24px;
}

.stats-detail h4 {
  font-family: Georgia, serif;
  font-size: 16px;
  margin-bottom: 16px;
}

/* ─── Misc ───────────────────────────────────────────────────────────────────── */
.flex { display: flex; }
.gap-8 { gap: 8px; }
.gap-16 { gap: 16px; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }
.text-muted { color: var(--color-muted); font-size: 13px; }
.text-center { text-align: center; }

.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Responsive: Tablet (769px – 1024px) ───────────────────────────────────── */
@media (max-width: 1024px) and (min-width: 769px) {
  .sidebar {
    width: 200px;
    min-width: 200px;
  }
  .main-content {
    padding: 28px 24px;
  }
  .admin-sidebar {
    width: 170px;
    min-width: 170px;
  }
  .admin-content {
    padding: 24px 20px;
  }
  .main-title {
    font-size: 24px;
  }
}

/* ─── Responsive: Mobile (≤768px) ───────────────────────────────────────────── */
@media (max-width: 768px) {

  /* Header */
  .header {
    padding: 0 16px;
  }
  .header-brand {
    font-size: 18px;
    letter-spacing: 2px;
  }
  .user-name {
    max-width: 90px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  /* Dashboard layout */
  .dashboard-layout {
    flex-direction: column;
  }

  /* Sidebar */
  .sidebar {
    width: 100%;
    min-width: unset;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding: 0;
  }

  .sidebar-title {
    display: none;
  }

  .sidebar-toggle {
    display: block;
    width: 100%;
    padding: 12px 20px;
    background: none;
    border: none;
    border-bottom: 1px solid var(--color-border);
    text-align: left;
    font-size: 13px;
    font-family: Arial, sans-serif;
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
  }

  .sidebar-toggle:hover {
    background: var(--color-bg);
  }

  .sidebar-body {
    display: none;
    padding: 8px 0;
  }

  .sidebar-body--open {
    display: block;
  }

  /* Main content */
  .main-content {
    padding: 20px 16px;
  }

  /* Lesson cards */
  .lessons-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  }

  /* Admin */
  .admin-layout {
    flex-direction: column;
  }
  .admin-sidebar {
    width: 100%;
  }
  .admin-content {
    padding: 20px 16px;
  }
  .form-row {
    grid-template-columns: 1fr;
  }

  /* Tables horizontal scroll */
  .table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  /* Auth */
  .auth-card {
    padding: 32px 24px;
  }
}

/* ─── Responsive: Small phones (≤400px) ─────────────────────────────────────── */
@media (max-width: 400px) {
  .lessons-grid {
    grid-template-columns: 1fr;
  }
  .header-user {
    gap: 8px;
  }
}