/* ============================================================
   LearnPro LMS — Global Dark Modern Stylesheet
   ============================================================ */

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --bg-primary:    #0d0e1a;
  --bg-secondary:  #13141f;
  --bg-card:       #1a1b2e;
  --bg-card-hover: #1e2035;
  --bg-input:      #12131e;
  --border:        #2a2b3d;
  --border-focus:  #6c63ff;

  --text-primary:   #e8e9ff;
  --text-secondary: #9091b0;
  --text-muted:     #5a5b78;

  --accent:         #6c63ff;
  --accent-dark:    #5851db;
  --accent-light:   #8b82ff;
  --accent-glow:    rgba(108, 99, 255, 0.3);

  --success:   #22c55e;
  --warning:   #f59e0b;
  --error:     #ef4444;
  --info:      #3b82f6;

  --gold:      #f59e0b;
  --crypto-btc: #F7931A;
  --crypto-eth: #627EEA;
  --crypto-usdt:#26A17B;

  --radius:    12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --shadow:    0 4px 24px rgba(0,0,0,0.4);
  --shadow-sm: 0 2px 12px rgba(0,0,0,0.3);
  --transition: 0.2s ease;

  --sidebar-width: 260px;
  --header-height: 64px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-light); }
img { max-width: 100%; display: block; }
input, textarea, select, button { font-family: inherit; }

/* ── Scrollbar ─────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ── Typography ────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.3;
  font-weight: 700;
  color: var(--text-primary);
}
h1 { font-size: clamp(1.8rem, 4vw, 3rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: 1.3rem; }
h4 { font-size: 1.1rem; }

p { color: var(--text-secondary); margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

/* ── Layout Containers ─────────────────────────────────────── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 680px; margin: 0 auto; padding: 0 24px; }
.container-lg { max-width: 1400px; margin: 0 auto; padding: 0 24px; }

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-dark);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow);
}
.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-outline:hover {
  background: var(--accent);
  color: #fff;
}
.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1.5px solid var(--border);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.btn-danger {
  background: var(--error);
  color: #fff;
}
.btn-danger:hover { background: #dc2626; color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-warning { background: var(--warning); color: #000; }
.btn-sm { padding: 7px 14px; font-size: 0.8rem; }
.btn-lg { padding: 14px 32px; font-size: 1rem; }
.btn-icon { padding: 8px; width: 36px; height: 36px; justify-content: center; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-block { width: 100%; justify-content: center; }
.btn-gradient {
  background: linear-gradient(135deg, var(--accent) 0%, #a855f7 100%);
  color: #fff;
}
.btn-gradient:hover {
  opacity: 0.9;
  color: #fff;
  transform: translateY(-1px);
}

/* ── Forms ─────────────────────────────────────────────────── */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  margin-bottom: 7px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
}
.form-control {
  width: 100%;
  padding: 11px 14px;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-control:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-control::placeholder { color: var(--text-muted); }
textarea.form-control { resize: vertical; min-height: 100px; }
select.form-control { cursor: pointer; }
.form-hint { margin-top: 5px; font-size: 0.8rem; color: var(--text-muted); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.input-group { position: relative; }
.input-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--text-muted); }
.input-group .form-control { padding-left: 38px; }

/* ── Cards ─────────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.card:hover { border-color: var(--accent); }
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.card-title { font-size: 1.05rem; font-weight: 700; }
.card-sm { padding: 16px; }
.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius) var(--radius) 0 0;
}

/* ── Alerts ────────────────────────────────────────────────── */
.alert {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 20px;
  border-left: 4px solid;
}
.alert-success { background: rgba(34,197,94,0.1); border-color: var(--success); color: var(--success); }
.alert-error   { background: rgba(239,68,68,0.1);  border-color: var(--error);   color: var(--error); }
.alert-warning { background: rgba(245,158,11,0.1); border-color: var(--warning); color: var(--warning); }
.alert-info    { background: rgba(59,130,246,0.1); border-color: var(--info);    color: var(--info); }
.alert-icon    { font-size: 1.1rem; flex-shrink: 0; }

/* ── Badges ────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.badge-primary { background: rgba(108,99,255,0.2); color: var(--accent); }
.badge-success { background: rgba(34,197,94,0.15); color: var(--success); }
.badge-warning { background: rgba(245,158,11,0.15);color: var(--warning); }
.badge-danger  { background: rgba(239,68,68,0.15); color: var(--error); }
.badge-info    { background: rgba(59,130,246,0.15);color: var(--info); }
.badge-muted   { background: var(--border);        color: var(--text-muted); }

/* ── Tables ────────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; }
thead tr { background: var(--bg-secondary); }
thead th {
  padding: 13px 16px;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}
tbody tr { border-bottom: 1px solid var(--border); transition: background var(--transition); }
tbody tr:last-child { border-bottom: none; }
tbody tr:hover { background: var(--bg-card-hover); }
tbody td { padding: 14px 16px; font-size: 0.9rem; vertical-align: middle; }

/* ── Stats Cards ────────────────────────────────────────────── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-bottom: 28px; }
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent);
}
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.stat-icon {
  width: 48px; height: 48px;
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 14px;
  background: var(--accent-glow);
  color: var(--accent);
}
.stat-value { font-size: 1.9rem; font-weight: 800; color: var(--text-primary); }
.stat-label { font-size: 0.8rem; color: var(--text-muted); margin-top: 4px; text-transform: uppercase; letter-spacing: 0.5px; }
.stat-change { font-size: 0.78rem; margin-top: 6px; }
.stat-change.up   { color: var(--success); }
.stat-change.down { color: var(--error); }

/* ── Navigation (Public) ────────────────────────────────────── */
.navbar {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-height);
  background: rgba(13,14,26,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
}
.navbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; max-width: 1400px; margin: 0 auto; padding: 0 24px;
}
.navbar-brand {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.3rem; font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
}
.navbar-brand .logo-icon {
  width: 36px; height: 36px;
  background: var(--accent);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; color: #fff;
}
.navbar-links { display: flex; align-items: center; gap: 8px; }
.navbar-links a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}
.navbar-links a:hover { color: var(--text-primary); background: var(--bg-card); }
.navbar-actions { display: flex; align-items: center; gap: 10px; }

/* ── Dashboard Layout ───────────────────────────────────────── */
.dashboard-wrapper { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  position: fixed; top: 0; left: 0; bottom: 0;
  display: flex; flex-direction: column;
  z-index: 50;
  overflow-y: auto;
  transition: transform var(--transition);
}
.sidebar-brand {
  padding: 20px 20px 10px;
  display: flex; align-items: center; gap: 10px;
  font-size: 1.1rem; font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 1px solid var(--border);
  margin-bottom: 10px;
}
.sidebar-nav { flex: 1; padding: 8px 12px; }
.nav-section-title {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  padding: 14px 10px 6px;
}
.nav-item {
  display: flex; align-items: center; gap: 11px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 2px;
  transition: all var(--transition);
  text-decoration: none;
}
.nav-item:hover { background: var(--bg-card); color: var(--text-primary); }
.nav-item.active { background: var(--accent-glow); color: var(--accent); font-weight: 600; }
.nav-item i { width: 18px; text-align: center; font-size: 0.95rem; }
.nav-badge {
  margin-left: auto;
  background: var(--error);
  color: #fff;
  border-radius: 99px;
  padding: 1px 7px;
  font-size: 0.68rem;
  font-weight: 700;
}

.sidebar-footer {
  padding: 16px 12px;
  border-top: 1px solid var(--border);
}
.user-mini {
  display: flex; align-items: center; gap: 10px;
  padding: 10px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
}
.user-mini img { width: 34px; height: 34px; border-radius: 50%; object-fit: cover; }
.user-mini-info { min-width: 0; }
.user-mini-name { font-size: 0.85rem; font-weight: 600; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-mini-role { font-size: 0.72rem; color: var(--text-muted); text-transform: capitalize; }

.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex; flex-direction: column;
  min-height: 100vh;
}
.topbar {
  height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 0 28px;
  display: flex; align-items: center; justify-content: space-between;
  position: sticky; top: 0; z-index: 40;
}
.topbar-title { font-size: 1.05rem; font-weight: 700; }
.topbar-actions { display: flex; align-items: center; gap: 12px; }
.notif-btn {
  position: relative;
  width: 38px; height: 38px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; color: var(--text-secondary);
  transition: all var(--transition);
}
.notif-btn:hover { border-color: var(--accent); color: var(--accent); }
.notif-dot {
  position: absolute; top: 6px; right: 6px;
  width: 8px; height: 8px;
  background: var(--error);
  border-radius: 50%;
  border: 2px solid var(--bg-secondary);
}
.page-content { padding: 28px; flex: 1; }

/* ── Course Cards ───────────────────────────────────────────── */
.courses-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 22px; }
.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}
.course-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(108,99,255,0.2);
  border-color: var(--accent);
}
.course-thumb {
  position: relative;
  height: 180px;
  overflow: hidden;
}
.course-thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.course-card:hover .course-thumb img { transform: scale(1.05); }
.course-thumb-overlay {
  position: absolute; inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex; align-items: center; justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.course-card:hover .course-thumb-overlay { opacity: 1; }
.course-level {
  position: absolute; top: 12px; left: 12px;
}
.course-body { padding: 18px; }
.course-category { font-size: 0.75rem; color: var(--accent); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; }
.course-title {
  font-size: 1rem; font-weight: 700;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.course-meta {
  display: flex; align-items: center; gap: 14px;
  font-size: 0.78rem; color: var(--text-muted);
  margin-bottom: 14px;
}
.course-meta span { display: flex; align-items: center; gap: 4px; }
.course-instructor { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; }
.course-instructor img { width: 26px; height: 26px; border-radius: 50%; object-fit: cover; }
.course-instructor span { font-size: 0.82rem; color: var(--text-secondary); }
.course-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}
.course-price { font-size: 1.1rem; font-weight: 800; color: var(--accent); }
.course-price .original { font-size: 0.8rem; color: var(--text-muted); text-decoration: line-through; margin-right: 6px; }
.course-rating { display: flex; align-items: center; gap: 5px; font-size: 0.8rem; }
.stars i { font-size: 0.7rem; color: var(--gold); }

/* ── Hero Section ───────────────────────────────────────────── */
.hero {
  min-height: 88vh;
  display: flex; align-items: center;
  position: relative;
  overflow: hidden;
  padding: 80px 0;
}
.hero-bg {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 60% 50%, rgba(108,99,255,0.12) 0%, transparent 70%),
              radial-gradient(ellipse at 10% 80%, rgba(168,85,247,0.08) 0%, transparent 60%);
}
.hero-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 60px; align-items: center;
}
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px;
  background: var(--accent-glow);
  border: 1px solid rgba(108,99,255,0.3);
  border-radius: 99px;
  font-size: 0.8rem; color: var(--accent);
  font-weight: 600;
  margin-bottom: 22px;
}
.hero h1 { margin-bottom: 18px; }
.hero h1 span {
  background: linear-gradient(135deg, var(--accent), #a855f7);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero p { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 32px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 32px; margin-top: 40px; }
.hero-stat-val { font-size: 1.6rem; font-weight: 800; color: var(--text-primary); }
.hero-stat-lbl { font-size: 0.78rem; color: var(--text-muted); }
.hero-image-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 30px 80px rgba(108,99,255,0.25);
  border: 1px solid rgba(108,99,255,0.2);
}
.hero-image-wrap img { width: 100%; border-radius: var(--radius-lg); }
.floating-card {
  position: absolute;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  backdrop-filter: blur(10px);
  font-size: 0.82rem;
}
.floating-card.top-left  { top: 20px; left: -30px; }
.floating-card.bot-right { bottom: 20px; right: -30px; }

/* ── Section Styles ─────────────────────────────────────────── */
.section { padding: 80px 0; }
.section-dark { background: var(--bg-secondary); }
.section-header { text-align: center; margin-bottom: 50px; }
.section-header .sub { font-size: 0.85rem; color: var(--accent); font-weight: 600; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 10px; }
.section-header p { max-width: 520px; margin: 10px auto 0; }

/* ── Progress Bar ───────────────────────────────────────────── */
.progress-wrap { background: var(--border); border-radius: 99px; height: 6px; overflow: hidden; }
.progress-bar { height: 100%; background: var(--accent); border-radius: 99px; transition: width 0.5s ease; }
.progress-bar.success { background: var(--success); }

/* ── Video Player ───────────────────────────────────────────── */
.video-player-wrap {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  background: #000;
  border-radius: var(--radius);
  overflow: hidden;
}
.video-player-wrap iframe,
.video-player-wrap video {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
}
video { background: #000; }

/* ── Payment Cards ──────────────────────────────────────────── */
.payment-method {
  border: 2px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  cursor: pointer;
  transition: all var(--transition);
  display: flex; align-items: center; gap: 14px;
}
.payment-method:hover { border-color: var(--accent); background: var(--bg-card-hover); }
.payment-method.selected { border-color: var(--accent); background: rgba(108,99,255,0.08); }
.payment-method input[type="radio"] { accent-color: var(--accent); transform: scale(1.2); }

.crypto-option {
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  cursor: pointer;
  transition: all var(--transition);
  display: flex; align-items: center; gap: 10px;
  font-weight: 600;
  font-size: 0.9rem;
}
.crypto-option:hover { border-color: var(--accent); }
.crypto-option.selected { border-color: var(--accent); background: rgba(108,99,255,0.08); }
.crypto-option input { display: none; }

/* ── Certificate ────────────────────────────────────────────── */
.certificate-container {
  background: linear-gradient(135deg, #1a1b2e, #13141f);
  border: 3px solid var(--accent);
  border-radius: var(--radius-lg);
  padding: 60px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.certificate-container::before,
.certificate-container::after {
  content: '';
  position: absolute;
  width: 200px; height: 200px;
  border-radius: 50%;
  background: var(--accent-glow);
}
.certificate-container::before { top: -80px; right: -80px; }
.certificate-container::after  { bottom: -80px; left: -80px; }
.cert-logo  { font-size: 2.5rem; font-weight: 900; color: var(--accent); margin-bottom: 6px; }
.cert-title { font-size: 0.9rem; text-transform: uppercase; letter-spacing: 3px; color: var(--text-muted); }
.cert-recipient { font-size: 2.2rem; font-weight: 700; color: var(--text-primary); margin: 24px 0 8px; }
.cert-course { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 30px; }
.cert-divider { width: 80px; height: 3px; background: var(--accent); margin: 24px auto; border-radius: 99px; }
.cert-id { font-size: 0.78rem; color: var(--text-muted); font-family: monospace; }

/* ── Quiz Styles ────────────────────────────────────────────── */
.quiz-question { margin-bottom: 28px; }
.quiz-q-text { font-size: 1rem; font-weight: 600; margin-bottom: 14px; color: var(--text-primary); }
.quiz-option {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  cursor: pointer;
  transition: all var(--transition);
  font-size: 0.9rem;
}
.quiz-option:hover { border-color: var(--accent); background: var(--bg-card-hover); }
.quiz-option input { accent-color: var(--accent); }
.quiz-option.correct { border-color: var(--success); background: rgba(34,197,94,0.08); }
.quiz-option.wrong   { border-color: var(--error);   background: rgba(239,68,68,0.08); }
.quiz-timer { font-size: 1.4rem; font-weight: 800; color: var(--warning); }
.quiz-progress { display: flex; align-items: center; gap: 10px; margin-bottom: 24px; }

/* ── Tabs ───────────────────────────────────────────────────── */
.tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--border); margin-bottom: 24px; }
.tab-btn {
  padding: 10px 18px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  cursor: pointer;
  font-size: 0.9rem; font-weight: 600;
  color: var(--text-muted);
  transition: all var(--transition);
}
.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active { color: var(--accent); border-bottom-color: var(--accent); }
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Modal ──────────────────────────────────────────────────── */
.modal-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: none; align-items: center; justify-content: center;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 560px; width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  animation: modalIn 0.2s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(-10px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-close {
  position: absolute; top: 16px; right: 16px;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--border);
  border: none; cursor: pointer;
  color: var(--text-secondary);
  display: flex; align-items: center; justify-content: center;
  transition: all var(--transition);
}
.modal-close:hover { background: var(--error); color: #fff; }

/* ── Breadcrumb ─────────────────────────────────────────────── */
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.82rem; color: var(--text-muted); margin-bottom: 20px; }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { color: var(--border); }

/* ── Lesson Sidebar ─────────────────────────────────────────── */
.lesson-layout { display: grid; grid-template-columns: 1fr 340px; gap: 24px; align-items: start; }
.lesson-sidebar { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; position: sticky; top: 80px; }
.lesson-sidebar-header { padding: 16px 20px; background: var(--bg-secondary); border-bottom: 1px solid var(--border); font-weight: 700; }
.lesson-list { max-height: 600px; overflow-y: auto; }
.lesson-item {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 20px;
  border-bottom: 1px solid var(--border);
  cursor: pointer; font-size: 0.87rem;
  transition: background var(--transition);
  text-decoration: none; color: var(--text-secondary);
}
.lesson-item:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.lesson-item.active { background: rgba(108,99,255,0.1); color: var(--accent); }
.lesson-item.completed .lesson-check { color: var(--success); }
.lesson-check { width: 20px; text-align: center; flex-shrink: 0; }
.lesson-duration { margin-left: auto; font-size: 0.75rem; color: var(--text-muted); }
.section-header-lesson {
  padding: 8px 20px;
  background: var(--bg-secondary);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

/* ── Live Class Card ────────────────────────────────────────── */
.live-badge { display: inline-flex; align-items: center; gap: 6px; padding: 4px 10px; background: rgba(239,68,68,0.15); color: var(--error); border-radius: 99px; font-size: 0.75rem; font-weight: 700; }
.live-dot { width: 6px; height: 6px; background: var(--error); border-radius: 50%; animation: pulse 1.2s ease infinite; }
@keyframes pulse { 0%,100%{transform:scale(1)} 50%{transform:scale(1.5)} }

/* ── Footer (Public) ────────────────────────────────────────── */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 60px 0 30px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand { font-size: 1.2rem; font-weight: 800; margin-bottom: 12px; }
.footer-links h5 { font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.6px; color: var(--text-muted); margin-bottom: 14px; }
.footer-links a { display: block; color: var(--text-secondary); font-size: 0.87rem; margin-bottom: 8px; transition: color var(--transition); }
.footer-links a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 24px; display: flex; justify-content: space-between; align-items: center; font-size: 0.82rem; color: var(--text-muted); }
.social-links { display: flex; gap: 10px; }
.social-link {
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: all var(--transition);
}
.social-link:hover { border-color: var(--accent); color: var(--accent); }

/* ── Search Bar ─────────────────────────────────────────────── */
.search-bar { position: relative; }
.search-bar input {
  padding-right: 44px;
  background: var(--bg-input);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  width: 100%; padding: 10px 44px 10px 14px;
  outline: none;
  font-size: 0.9rem;
  transition: border-color var(--transition);
}
.search-bar input:focus { border-color: var(--accent); }
.search-bar button {
  position: absolute; right: 4px; top: 50%; transform: translateY(-50%);
  background: var(--accent); color: #fff; border: none;
  width: 34px; height: 34px; border-radius: 6px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
}

/* ── Utility ────────────────────────────────────────────────── */
.text-center  { text-align: center; }
.text-right   { text-align: right; }
.text-accent  { color: var(--accent); }
.text-success { color: var(--success); }
.text-danger  { color: var(--error); }
.text-warning { color: var(--warning); }
.text-muted   { color: var(--text-muted); }
.fw-bold      { font-weight: 700; }
.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }
.gap-3 { gap: 24px; }
.w-100 { width: 100%; }
.hidden { display: none !important; }
.ellipsis { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rounded { border-radius: var(--radius); }
.avatar { width: 40px; height: 40px; border-radius: 50%; object-fit: cover; }
.avatar-lg { width: 64px; height: 64px; }
.avatar-xl { width: 96px; height: 96px; }

/* ── Loading Spinner ────────────────────────────────────────── */
.spinner {
  width: 28px; height: 28px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin: 0 auto;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Empty State ─────────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.empty-state-icon { font-size: 3rem; margin-bottom: 16px; }
.empty-state h3 { color: var(--text-secondary); margin-bottom: 8px; }

/* ── Dropdown ───────────────────────────────────────────────── */
.dropdown { position: relative; display: inline-block; }
.dropdown-menu {
  position: absolute; top: calc(100% + 8px); right: 0;
  min-width: 200px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px;
  z-index: 200;
  box-shadow: var(--shadow);
  opacity: 0; visibility: hidden;
  transform: translateY(-8px);
  transition: all var(--transition);
}
.dropdown:hover .dropdown-menu,
.dropdown.open .dropdown-menu {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.dropdown-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  border: none; background: none; width: 100%; text-align: left;
}
.dropdown-item:hover { background: var(--bg-card-hover); color: var(--text-primary); }
.dropdown-item.danger:hover { background: rgba(239,68,68,0.1); color: var(--error); }
.dropdown-divider { border-top: 1px solid var(--border); margin: 6px 0; }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .lesson-layout { grid-template-columns: 1fr; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-image-wrap { display: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .courses-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
  .page-content { padding: 16px; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
}