/* =================================================================
   TEROUSD — REDESIGNED STYLESHEET
   Theme: Dark Slate / Electric Green — Production Grade
   ================================================================= */

@import url('https://fonts.googleapis.com/css2?family=Sora:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;700&display=swap');

:root {
  --bg:          #090c10;
  --surface:     #0f1318;
  --surface2:    #161b22;
  --surface3:    #1c232d;
  --border:      rgba(255,255,255,0.07);
  --border2:     rgba(255,255,255,0.12);
  --accent:      #00e5a0;
  --accent-dim:  rgba(0,229,160,0.12);
  --accent-dim2: rgba(0,229,160,0.06);
  --red:         #ff4757;
  --yellow:      #ffd32a;
  --blue:        #3b82f6;
  --purple:      #a855f7;
  --text:        #e8edf3;
  --text-2:      #8b95a1;
  --text-3:      #4a5568;
  --radius:      12px;
  --radius-sm:   8px;
  --radius-lg:   16px;
  --shadow:      0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg:   0 8px 40px rgba(0,0,0,0.6);
  --transition:  all 0.2s cubic-bezier(0.4,0,0.2,1);
  --font:        'Sora', sans-serif;
  --mono:        'JetBrains Mono', monospace;

  /* Legacy aliases so existing JS-inline styles keep working */
  --bg-color:       var(--bg);
  --card-color:     var(--surface2);
  --accent-color:   var(--accent);
  --text-primary:   var(--text);
  --text-secondary: var(--text-2);
  --live-red:       var(--red);
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body.login-page {
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}
body.login-page header { position: absolute; top: 0; left: 0; width: 100%; }

/* ── Loader ─────────────────────────────────────────────────────── */
.loader-container {
  position: fixed; inset: 0;
  background: var(--bg);
  display: flex; justify-content: center; align-items: center;
  z-index: 9999;
  transition: opacity 0.3s ease;
}

.loader {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 2px solid var(--border2);
  border-top-color: var(--accent);
  animation: spin 0.7s linear infinite;
}

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

body:not(.is-loading) .loader-container { display: none; }

body.is-loading header,
body.is-loading footer,
body.is-loading #main-app-content,
body.is-loading .container,
body.is-loading > div:not(.loader-container) {
  visibility: hidden !important;
  opacity: 0 !important;
}

/* ── Skeleton Loading ───────────────────────────────────────────── */
@keyframes shimmer {
  0%   { background-position: -600px 0; }
  100% { background-position:  600px 0; }
}

.skeleton {
  background: linear-gradient(90deg,
    var(--surface2) 25%,
    var(--surface3) 50%,
    var(--surface2) 75%
  );
  background-size: 600px 100%;
  animation: shimmer 1.4s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.skeleton-card {
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--surface2);
}

.skeleton-img {
  width: 100%; aspect-ratio: 16/9;
}

.skeleton-text {
  height: 14px; margin: 10px 15px 6px;
}

.skeleton-text.wide { width: 75%; }
.skeleton-text.narrow { width: 45%; }

/* ── Typography ─────────────────────────────────────────────────── */
h1, h2, h3, h4 { font-weight: 700; line-height: 1.2; }

/* ── Header ─────────────────────────────────────────────────────── */
header {
  position: sticky; top: 0;
  z-index: 200;
  padding: 0 28px;
  height: 60px;
  display: flex; align-items: center;
  background: rgba(9,12,16,0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  font-size: 1.2em;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.02em;
}

header a {
  color: inherit; text-decoration: none;
}

/* Accent dot on brand */
header::after {
  content: '●';
  color: var(--accent);
  font-size: 0.4em;
  margin-left: 4px;
  vertical-align: super;
}

/* ── Main Content ───────────────────────────────────────────────── */
#main-app-content, #admin-panel { flex-grow: 1; }

.container {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  padding: 24px;
  max-width: 1400px;
  margin: 0 auto;
  align-items: flex-start;
}

/* ── Back Link Wrapper ──────────────────────────────────────────── */
.back-link-wrapper {
  width: 100%;
  max-width: 1400px;
  margin: 0 auto;
  padding: 12px 24px 0;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.back-link-wrapper .small-back-link { margin-right: auto; }

.small-back-link {
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.82em;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border2);
  transition: var(--transition);
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--surface2);
  cursor: pointer;
}

.small-back-link:hover {
  background: var(--surface3);
  color: var(--text);
  border-color: var(--border2);
}

.admin-add-chapter-btn {
  display: none;
  padding: 7px 16px;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 700;
  font-size: 0.82em;
  font-family: var(--font);
  transition: var(--transition);
  display: none;
  align-items: center;
  gap: 6px;
}

.admin-add-chapter-btn:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

/* ── Footer ─────────────────────────────────────────────────────── */
footer {
  text-align: center;
  padding: 12px 24px;
  background: var(--surface);
  border-top: 1px solid var(--border);
  margin-top: auto;
}

.logout-button-footer {
  display: none;
  margin-bottom: 8px;
  padding: 4px 12px;
  font-family: var(--font);
  font-weight: 600;
  font-size: 0.75em;
  color: var(--text-2);
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 6px;
  cursor: pointer;
  transition: var(--transition);
}

.logout-button-footer:hover {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}

.copyright {
  font-size: 0.8em;
  color: var(--text-3);
  font-family: var(--mono);
}

/* ── Auth / Login ───────────────────────────────────────────────── */
#auth-container {
  width: 100%;
  max-width: 420px;
  padding: 32px;
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border2);
  box-shadow: var(--shadow-lg);
  margin-top: 80px;
}

.auth-form {
  display: flex; flex-direction: column; gap: 14px;
}

.auth-form h3 {
  text-align: center;
  color: var(--accent);
  font-size: 1.3em;
  margin-bottom: 4px;
}

.auth-subtext {
  text-align: center;
  font-size: 0.85em;
  color: var(--text-2);
  margin-top: -8px;
}

.auth-message {
  font-weight: 600;
  font-size: 0.85em;
  text-align: center;
  color: var(--text-2);
  min-height: 1.2em;
}

.form-field { width: 100%; }

.form-field input,
#auth-container .form-field input {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border2);
  background: var(--surface2);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95em;
  transition: var(--transition);
}

.form-field input:focus,
#auth-container .form-field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

#auth-container .email-btn {
  width: 100%;
  padding: 12px;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 700;
  font-size: 0.95em;
  font-family: var(--font);
  transition: var(--transition);
  margin-top: 4px;
}

#auth-container .email-btn:hover { filter: brightness(1.1); transform: translateY(-1px); }

.google-btn-container { display: flex; justify-content: center; padding: 4px 0; }

.google-btn {
  display: flex; align-items: center; justify-content: center;
  gap: 10px;
  background: #fff !important; color: #444 !important;
  font-weight: 600 !important; font-size: 0.9em !important;
  border: 1px solid #ddd !important;
  width: 100%; cursor: pointer; padding: 11px 16px;
  border-radius: var(--radius-sm); font-family: var(--font);
  transition: var(--transition);
}

.google-btn:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.15); }

.telegram-link-fix {
  display: flex; align-items: center; justify-content: center;
  gap: 8px; text-decoration: none; color: var(--text-2);
  font-size: 0.85em; margin-top: 12px;
  transition: var(--transition);
  padding: 8px 12px; border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.telegram-link-fix:hover { color: var(--text); border-color: var(--border2); }
.telegram-link-fix .fa-brands.fa-telegram { color: #0088cc; font-size: 1.2em; }

.divider {
  display: flex; align-items: center;
  color: var(--text-3); font-size: 0.8em;
  margin: 6px 0;
  gap: 10px;
}

.divider::before, .divider::after {
  content: ''; flex: 1;
  border-bottom: 1px solid var(--border2);
}

.form-toggle {
  text-align: center; font-size: 0.85em;
  color: var(--text-2); cursor: pointer; margin: 4px 0;
}

.form-toggle strong { color: var(--accent); text-decoration: underline; }

.forgot-password-link {
  text-align: right; font-size: 0.82em;
  color: var(--text-2); cursor: pointer;
  margin-top: 2px;
  transition: var(--transition);
}

.forgot-password-link:hover { color: var(--accent); }

/* ── Cards ──────────────────────────────────────────────────────── */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
  width: 100%;
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 20px 20px;
}

.subject-card {
  background: var(--surface2);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  text-decoration: none;
  color: var(--text);
  display: block;
  transition: var(--transition);
  position: relative;
}

.subject-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 12px 32px rgba(0,229,160,0.1);
}

.subject-card img {
  width: 100%; aspect-ratio: 16/9;
  object-fit: cover; display: block;
  background: var(--surface3);
}

.subject-card-text {
  padding: 14px 16px;
  background: var(--surface2);
  display: flex; flex-direction: column; gap: 4px;
}

.subject-title-bengali {
  font-size: 1em; font-weight: 700; color: var(--text);
}

.subject-title-english {
  font-size: 0.8em; color: var(--text-2);
}

/* ── Chapter Cards ──────────────────────────────────────────────── */
.chapter-card {
  background: linear-gradient(135deg, #0f1f3d 0%, #1a1040 100%);
  position: relative;
  min-height: 180px;
  display: flex; flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.08);
  transition: var(--transition);
  text-shadow: 0 2px 6px rgba(0,0,0,0.8);
  border-radius: var(--radius);
}

.chapter-card::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.15), rgba(0,0,0,0.7));
  z-index: 1; pointer-events: none;
}

.chapter-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 12px 32px rgba(0,229,160,0.12);
}

.chapter-card-header,
.chapter-card-body,
.chapter-card-admin-actions {
  position: relative; z-index: 2;
}

.chapter-card-header {
  background: rgba(0,0,0,0.35);
  padding: 8px 14px;
  font-size: 0.7em;
  color: rgba(255,255,255,0.7);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  font-family: var(--mono);
}

.chapter-card-body {
  flex-grow: 1;
  display: flex; align-items: center; justify-content: center;
  padding: 24px 18px; text-align: center;
}

.chapter-main-title {
  font-size: 1.5em; font-weight: 800;
  color: #fff; line-height: 1.2;
}

.chapter-card-admin-actions {
  position: absolute; top: 10px; right: 10px;
  display: flex; gap: 5px;
}

.chapter-card .admin-action-btn {
  padding: 5px 10px; font-size: 0.78em;
  border-radius: 6px; opacity: 0.9;
  border: none; cursor: pointer;
  font-family: var(--font);
  font-weight: 600;
}

.chapter-card .admin-action-btn:hover { opacity: 1; transform: scale(1.05); }
.chapter-card .admin-action-btn.edit-btn  { background: var(--yellow); color: #111; }
.chapter-card .admin-action-btn.delete-btn { background: var(--red); color: #fff; }
.chapter-card-text { display: none; }

/* Subject card admin actions */
.subject-card-admin-actions {
  position: absolute; top: 10px; right: 10px;
  display: flex; gap: 5px; z-index: 10;
}

.subject-card .admin-action-btn {
  padding: 5px 10px; font-size: 0.78em;
  border-radius: 6px; opacity: 0.9;
  border: none; cursor: pointer;
  font-family: var(--font); font-weight: 600;
  transition: var(--transition);
}

.subject-card .admin-action-btn:hover { opacity: 1; transform: scale(1.05); }
.subject-card .admin-action-btn.edit-btn   { background: var(--yellow); color: #111; }
.subject-card .admin-action-btn.delete-btn { background: var(--red); color: #fff; }

/* ── Admin Panel ────────────────────────────────────────────────── */
.admin-section {
  border: 1px solid var(--border2);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 24px;
  background: var(--surface2);
}

.admin-section h3 {
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 16px;
  font-size: 1.05em;
  display: flex; align-items: center; gap: 8px;
}

.admin-section h4 {
  color: var(--text-2); font-size: 0.85em;
  margin: 20px 0 10px;
}

.admin-form { display: flex; flex-direction: column; gap: 10px; }

.admin-form-desc {
  font-size: 0.8em; color: var(--text-2);
  margin: -4px 0 4px;
}

.admin-form label {
  font-weight: 600; font-size: 0.85em;
  color: var(--text-2);
  margin-top: 4px;
}

.admin-form input,
.admin-form textarea,
.admin-select {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border2);
  background: var(--surface3);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.9em;
  transition: var(--transition);
}

.admin-form input:focus,
.admin-form textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.admin-form input:disabled {
  background: rgba(255,255,255,0.04);
  color: var(--text-3);
  cursor: not-allowed;
  border-color: var(--border);
}

.admin-form textarea {
  min-height: 90px; resize: vertical; font-size: 0.9em;
}

.admin-form button, .admin-action-btn {
  padding: 10px 16px;
  background: var(--accent);
  color: var(--bg);
  border: none; border-radius: var(--radius-sm);
  cursor: pointer; font-weight: 700;
  font-family: var(--font); font-size: 0.9em;
  transition: var(--transition);
}

.admin-form button:hover, .admin-action-btn:hover { filter: brightness(1.1); transform: translateY(-1px); }
.admin-form button:disabled { background: var(--surface3); color: var(--text-3); cursor: not-allowed; transform: none; }

.admin-message {
  text-align: center; font-weight: 600;
  margin-top: 8px; min-height: 1.2em;
  font-size: 0.88em;
}

/* Admin Item List */
.admin-item-list { list-style: none; }

.admin-item-list li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between;
  align-items: center; gap: 10px; flex-wrap: wrap;
}

.admin-item-list li:last-child { border-bottom: none; }
.admin-item-list p { text-align: center; color: var(--text-2); font-size: 0.88em; padding: 16px; }
.admin-item-list li > span, .admin-item-list li > div { flex-grow: 1; }
.admin-list-subtext { font-size: 0.78em; color: var(--text-2); margin-top: 2px; }

.admin-item-list button {
  padding: 4px 10px;
  border: none; border-radius: 6px;
  cursor: pointer; font-size: 0.78em;
  font-family: var(--font); font-weight: 600;
  margin-left: 4px;
  transition: var(--transition);
}

.admin-item-list .delete-btn  { background: var(--red); color: #fff; }
.admin-item-list .edit-btn    { background: var(--yellow); color: #111; }
.admin-item-list .approve-btn { background: #22c55e; color: #fff; }

/* Admin view toggle */
.admin-view-toggle {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 7px 14px;
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.82em; font-weight: 600;
  transition: var(--transition);
  background: var(--surface2);
}

.admin-view-toggle:hover {
  background: var(--surface3);
  color: var(--text);
}

/* ── User Management Cards ──────────────────────────────────────── */
.user-search-container {
  background: var(--surface3);
  padding: 16px; border-radius: var(--radius);
  margin-bottom: 16px;
  border: 1px solid var(--border);
}

.search-input-wrapper {
  display: flex; gap: 8px; margin-bottom: 12px; flex-wrap: wrap;
}

.search-input-wrapper input {
  flex: 1; min-width: 200px;
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border2);
  background: var(--surface2);
  color: var(--text);
  font-family: var(--font); font-size: 0.88em;
  transition: var(--transition);
}

.search-input-wrapper input:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}

.search-input-wrapper button {
  padding: 9px 16px;
  border: none; border-radius: var(--radius-sm);
  cursor: pointer; font-weight: 700;
  font-family: var(--font); font-size: 0.85em;
  transition: var(--transition);
}

#search-btn { background: var(--accent); color: var(--bg); }
#clear-search-btn { background: var(--surface2); color: var(--text-2); border: 1px solid var(--border2); }
#clear-search-btn:hover { background: var(--surface3); }

.filter-tabs { display: flex; gap: 8px; flex-wrap: wrap; }

.filter-tab {
  padding: 6px 14px;
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 20px;
  cursor: pointer; color: var(--text-2);
  font-size: 0.82em; font-weight: 600;
  font-family: var(--font);
  transition: var(--transition);
}

.filter-tab:hover { background: var(--surface3); color: var(--text); }
.filter-tab.active { background: var(--accent); color: var(--bg); border-color: var(--accent); }

/* User Cards */
.user-card {
  background: var(--surface3);
  padding: 14px 16px;
  border-radius: var(--radius);
  margin-bottom: 10px;
  border-left: 3px solid var(--accent);
  display: flex; justify-content: space-between;
  align-items: flex-start; gap: 14px; flex-wrap: wrap;
  transition: var(--transition);
}

.user-card:hover { background: #1f2937; }
.user-card.pending  { border-left-color: var(--yellow); }
.user-card.frozen   { border-left-color: var(--blue); opacity: 0.7; }

.user-info { flex: 1; min-width: 220px; }
.user-info h4 { margin: 0 0 6px; color: var(--text); font-size: 0.98em; }
.user-info p  { margin: 3px 0; color: var(--text-2); font-size: 0.82em; }
.user-info .trx-id { color: var(--accent); font-weight: 700; font-family: var(--mono); }

.user-status-badge {
  display: inline-block; padding: 2px 10px;
  border-radius: 12px; font-size: 0.72em; font-weight: 700;
  margin-top: 4px; font-family: var(--mono);
}

.user-status-badge.approved { background: rgba(34,197,94,0.15); color: #22c55e; }
.user-status-badge.pending  { background: rgba(255,211,42,0.15); color: var(--yellow); }
.user-status-badge.frozen   { background: rgba(59,130,246,0.15); color: var(--blue); }

.user-actions { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }

.user-actions button {
  padding: 5px 11px;
  border: none; border-radius: 6px;
  cursor: pointer; font-size: 0.78em; font-weight: 700;
  font-family: var(--font); transition: var(--transition);
}

.user-actions button:hover { filter: brightness(1.15); transform: translateY(-1px); }

.user-actions .approve-btn     { background: #22c55e; color: #fff; }
.user-actions .freeze-btn      { background: var(--blue); color: #fff; }
.user-actions .unfreeze-btn    { background: var(--accent); color: var(--bg); }
.user-actions .edit-devices-btn{ background: var(--purple); color: #fff; }
.user-actions .delete-btn      { background: var(--red); color: #fff; }

/* Stats */
.stats-container { display: flex; gap: 12px; margin-bottom: 16px; flex-wrap: wrap; }

.stat-box {
  flex: 1; min-width: 120px;
  background: var(--surface3);
  padding: 14px 12px;
  border-radius: var(--radius);
  text-align: center;
  border: 1px solid var(--border);
  transition: var(--transition);
}

.stat-box:hover { border-color: var(--accent); }

.stat-box h3 {
  margin: 0; font-size: 1.8em;
  color: var(--accent); font-family: var(--mono);
}

.stat-box p { margin: 4px 0 0; color: var(--text-2); font-size: 0.78em; text-transform: uppercase; letter-spacing: 0.5px; }

.no-results {
  text-align: center; color: var(--text-2);
  padding: 32px; font-size: 0.9em; font-style: italic;
}

/* ── Modals ─────────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.75);
  display: none; justify-content: center; align-items: center;
  z-index: 1000; padding: 16px;
  backdrop-filter: blur(4px);
}

.modal-overlay.active { display: flex; animation: fadeIn 0.15s ease; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal-content {
  background: var(--surface);
  padding: 24px;
  border-radius: var(--radius-lg);
  max-width: 90%; width: 460px;
  position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,0.7);
  border: 1px solid var(--border2);
  animation: slideUp 0.2s cubic-bezier(0.4,0,0.2,1);
}

@keyframes slideUp { from { transform: translateY(12px); opacity: 0.5; } to { transform: translateY(0); opacity: 1; } }

.modal-content.small-modal { width: 360px; }

.close-btn {
  position: absolute; top: 12px; right: 16px;
  color: var(--text-2); font-size: 1.4em; font-weight: 400;
  cursor: pointer; transition: var(--transition);
  line-height: 1; width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 6px;
}

.close-btn:hover { color: var(--red); background: rgba(255,71,87,0.1); }

.modal-actions {
  display: flex; justify-content: flex-end; gap: 8px; margin-top: 18px;
}

/* ── Announcement / Banner ──────────────────────────────────────── */
#announcement-section { width: 100%; padding: 8px 0; }

.announcements-main-title {
  color: var(--accent); text-align: center;
  font-size: 2em; font-weight: 800; margin-bottom: 16px;
}

@keyframes marquee-scroll-new {
  0%   { transform: translateX(100%); }
  100% { transform: translateX(-100%); }
}

.announcement-bar {
  width: 100%; overflow: hidden; white-space: nowrap;
  padding: 8px 14px; margin-bottom: 8px;
  background: var(--surface2);
  border-radius: var(--radius-sm);
  display: flex; align-items: center;
  border: 1px solid var(--border);
}

.announcement-bar .marquee-text-prefix { margin-right: 8px; font-size: 1em; }
.announcement-bar .marquee-text { display: inline-block; font-weight: 600; flex-shrink: 0; }

.announcement-bar.style-1 .marquee-text-prefix,
.announcement-bar.style-1 .marquee-text { color: var(--red); animation: marquee-scroll-new 7s linear infinite; }

.announcement-bar.style-2 .marquee-text-prefix,
.announcement-bar.style-2 .marquee-text { color: var(--blue); animation: marquee-scroll-new 8s linear infinite; }

.banner-section { width: 100%; margin-top: 20px; }

.banner-title {
  font-size: 1.1em; color: var(--text);
  margin-bottom: 12px; text-align: center; font-weight: 600;
}

.course-banner-slider {
  width: 100%; border-radius: var(--radius);
  overflow: hidden; position: relative;
  max-height: 520px; height: 520px;
  background: var(--surface2);
  border: 1px solid var(--border);
}

.slider-track { display: flex; height: 100%; }

.slider-image-container {
  height: 100%; flex-shrink: 0;
  display: flex; justify-content: center; align-items: center;
}

.slider-image {
  width: 100%; height: 100%;
  max-height: 520px; object-fit: contain; display: block;
}

.slider-nav-btn {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(0,0,0,0.5); color: #fff;
  border: 1px solid var(--border2); border-radius: 8px;
  width: 36px; height: 36px; font-size: 16px; font-weight: 700;
  cursor: pointer; z-index: 10; opacity: 0.7;
  transition: var(--transition);
  display: flex; align-items: center; justify-content: center;
}

.slider-nav-btn:hover { opacity: 1; background: var(--accent); color: var(--bg); border-color: var(--accent); }
.slider-nav-btn.prev { left: 10px; }
.slider-nav-btn.next { right: 10px; }

/* ── Info Section (Footer) ──────────────────────────────────────── */
.info-section-black {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 56px 24px 40px;
  margin-top: 40px;
}

.info-container {
  display: flex; flex-wrap: wrap; justify-content: space-between;
  max-width: 1100px; margin: 0 auto; gap: 40px;
}

.info-col { flex: 1; min-width: 220px; }

.info-brand {
  font-size: 1.3em; font-weight: 800; color: var(--text);
  margin-bottom: 12px; display: block; letter-spacing: -0.02em;
}

.info-header {
  font-size: 0.85em; font-weight: 700; color: var(--text-2);
  margin-bottom: 16px; text-transform: uppercase;
  letter-spacing: 0.8px; font-family: var(--mono);
}

.info-text, .info-list a, .info-contact-item {
  color: var(--text-2); font-size: 0.88em; line-height: 1.8;
  text-decoration: none; transition: var(--transition); display: block;
}

.info-list { list-style: none; }
.info-list li { margin-bottom: 8px; }
.info-list a:hover { color: var(--text); padding-left: 4px; }

.info-contact-item {
  display: flex; align-items: center; gap: 10px; margin-bottom: 12px;
}

.info-contact-item i { font-size: 1em; width: 18px; color: var(--text-2); }
.info-contact-item:hover { color: var(--text); }
.info-contact-item:hover i { color: var(--accent); }

/* ── Topic Item (Playlist) ──────────────────────────────────────── */
.topic-item-admin-actions { flex-shrink: 0; display: flex; gap: 4px; margin-left: auto; }

.topic-item .admin-action-btn {
  padding: 3px 8px; font-size: 0.72em; font-weight: 600;
}

.topic-item .admin-action-btn.delete-btn { background: var(--red); color: #fff; }
.topic-item .admin-action-btn.edit-btn   { background: var(--yellow); color: #111; }

/* ── Notification System ────────────────────────────────────────── */
.notification-wrapper { position: relative; }

.notification-btn {
  background: var(--surface2); border: 1px solid var(--border2);
  color: var(--text-2); width: 36px; height: 36px;
  border-radius: var(--radius-sm); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  position: relative; transition: var(--transition);
  font-size: 0.95em;
}

.notification-btn:hover { background: var(--surface3); color: var(--text); border-color: var(--accent); }

.notification-badge {
  position: absolute; top: -4px; right: -4px;
  background: var(--red); color: #fff;
  border-radius: 10px; font-size: 0.62em;
  font-weight: 700; min-width: 16px; height: 16px;
  display: flex; align-items: center; justify-content: center;
  padding: 0 4px; font-family: var(--mono);
}

.notification-dropdown {
  position: absolute; top: calc(100% + 8px); right: 0;
  width: 300px; max-height: 380px;
  background: var(--surface); border: 1px solid var(--border2);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  z-index: 500; display: none; overflow: hidden;
}

.notification-dropdown.open { display: flex; flex-direction: column; }

.notification-header {
  padding: 12px 14px; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  font-weight: 700; font-size: 0.88em;
}

.text-btn {
  background: none; border: none; color: var(--accent);
  cursor: pointer; font-size: 0.8em; font-weight: 600;
  font-family: var(--font); padding: 0;
}

.text-btn:hover { text-decoration: underline; }

#notification-list { overflow-y: auto; flex: 1; padding: 6px 0; }

.no-notifs { text-align: center; color: var(--text-2); padding: 24px; font-size: 0.85em; }

/* ── Reactors ───────────────────────────────────────────────────── */
.reactors-list-container { overflow-y: auto; }

/* ── Responsive ─────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .container { flex-direction: column; padding: 12px; }
  .subject-grid { grid-template-columns: 1fr 1fr; padding: 10px; gap: 12px; }
  .chapter-main-title { font-size: 1.2em; }
  .chapter-card { min-height: 150px; }
  .back-link-wrapper { padding: 10px 12px 0; flex-wrap: wrap; gap: 8px; }
  .admin-add-chapter-btn { width: 100%; justify-content: center; }
  .stats-container { gap: 8px; }
  .stat-box h3 { font-size: 1.5em; }
  .user-card { flex-direction: column; }
  .user-actions { width: 100%; }
  .user-actions button { flex: 1; }
  .info-container { flex-direction: column; gap: 24px; }
  .info-section-black { padding: 36px 16px; }
  .course-banner-slider { height: 220px !important; max-height: 220px !important; }
  .slider-image { max-height: 220px !important; }
  body.login-page { justify-content: flex-start; padding-top: 80px; }
  #auth-container { width: 100%; max-width: 100%; border-radius: 0; border-left: none; border-right: none; margin-top: 0; box-shadow: none; }
  .announcements-main-title { font-size: 1.6em; }
}

@media (max-width: 480px) {
  .subject-grid { grid-template-columns: 1fr; }
}