/* assets/css/main.css */
:root {
  --primary: #1e3a5f;
  --primary-light: #2d6a9f;
  --primary-glow: rgba(45,106,159,0.15);
  --accent: #00c9a7;
  --accent-dark: #00a88a;
  --danger: #e74c3c;
  --danger-light: rgba(231,76,60,0.1);
  --success: #2ecc71;
  --success-light: rgba(46,204,113,0.1);
  --warning: #f39c12;
  --warning-light: rgba(243,156,18,0.1);
  --info: #3498db;
  --bg: #f0f4f8;
  --bg-card: #ffffff;
  --bg-sidebar: #0f2340;
  --text: #1a2332;
  --text-muted: #6b7c93;
  --border: #e1e8f0;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 20px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
  --transition: all 0.25s ease;
  --font: 'Sora', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 15px;
  overflow-x: hidden;
}

/* ===================== NAVBAR ===================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 32px;
  height: 96px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 12px rgba(0,0,0,0.06);
}

.nav-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav-logo { height: 84px; width: auto; max-width: 280px; object-fit: contain; border-radius: 8px; }
.nav-logo-text {
  font-size: 26px;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.5px;
}
.nav-logo-text i { color: var(--accent); font-size: 28px; }

.nav-links { display: flex; align-items: center; gap: 8px; }
.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
  position: relative;
}
.nav-link:hover, .nav-link.active { color: var(--primary); background: var(--primary-glow); }
.nav-link .badge {
  position: absolute;
  top: 4px; right: 4px;
  background: var(--danger);
  color: #fff;
  border-radius: 50%;
  width: 16px; height: 16px;
  font-size: 10px;
  display: flex; align-items: center; justify-content: center;
}

.btn-primary-sm {
  padding: 9px 20px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  transition: var(--transition);
}
.btn-primary-sm:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(30,58,95,0.3); }

/* User dropdown */
.nav-user-dropdown { position: relative; }
.nav-user-btn {
  display: flex; align-items: center; gap: 10px;
  background: none; border: 1px solid var(--border);
  border-radius: 40px; padding: 6px 14px 6px 6px;
  cursor: pointer; font-family: var(--font); font-size: 14px;
  font-weight: 500; color: var(--text); transition: var(--transition);
}
.nav-user-btn:hover { border-color: var(--primary); background: var(--primary-glow); }
.nav-avatar { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; }
.nav-avatar-placeholder {
  width: 32px; height: 32px; border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff; display: flex; align-items: center; justify-content: center; font-size: 13px;
}
.dropdown-menu {
  position: absolute; top: calc(100% + 8px); right: 0;
  background: #fff; border-radius: var(--radius); border: 1px solid var(--border);
  box-shadow: var(--shadow-lg); min-width: 180px;
  opacity: 0; visibility: hidden; transform: translateY(-8px);
  transition: var(--transition); z-index: 1001;
}
.nav-user-dropdown:hover .dropdown-menu,
.nav-user-dropdown.open .dropdown-menu {
  opacity: 1; visibility: visible; transform: translateY(0);
}
.dropdown-menu a {
  display: flex; align-items: center; gap: 10px;
  padding: 11px 16px; color: var(--text); text-decoration: none;
  font-size: 14px; transition: var(--transition);
}
.dropdown-menu a:hover { background: var(--bg); color: var(--primary); }
.dropdown-menu a:first-child { border-radius: var(--radius) var(--radius) 0 0; }
.dropdown-menu a:last-child { border-radius: 0 0 var(--radius) var(--radius); }
.dropdown-divider { border-top: 1px solid var(--border); margin: 4px 0; }
.text-danger { color: var(--danger) !important; }

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  color: var(--text);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  align-items: center;
  justify-content: center;
}
.mobile-menu-btn:hover { background: var(--primary-glow); color: var(--primary); }

/* ===================== PAGE WRAPPER ===================== */
.page-wrapper { min-height: calc(100vh - 96px - 56px); }

/* ===================== FLASH ===================== */
.flash-container { position: fixed; top: 108px; right: 20px; z-index: 9999; max-width: 400px; width: calc(100% - 40px); }
.flash {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 20px; border-radius: var(--radius);
  margin-bottom: 10px; font-size: 14px; font-weight: 500;
  box-shadow: var(--shadow-lg); animation: slideIn 0.3s ease;
}
@keyframes slideIn { from { transform: translateX(100px); opacity: 0; } }
.flash-success { background: #d4edda; color: #155724; border-left: 4px solid var(--success); }
.flash-danger  { background: #f8d7da; color: #721c24; border-left: 4px solid var(--danger); }
.flash-info    { background: #d1ecf1; color: #0c5460; border-left: 4px solid var(--info); }
.flash-warning { background: #fff3cd; color: #856404; border-left: 4px solid var(--warning); }
.flash-close { margin-left: auto; background: none; border: none; cursor: pointer; font-size: 16px; color: inherit; opacity: 0.6; }
.flash-close:hover { opacity: 1; }

/* ===================== AUTH PAGES ===================== */
.auth-page {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg);
}
.auth-left {
  background: linear-gradient(160deg, var(--primary) 0%, var(--primary-light) 50%, #1a5276 100%);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 60px; color: #fff; position: relative; overflow: hidden;
}
.auth-left::before {
  content: '';
  position: absolute; top: -50%; left: -50%;
  width: 200%; height: 200%;
  background: radial-gradient(circle at 60% 40%, rgba(0,201,167,0.15) 0%, transparent 60%);
  pointer-events: none;
}
.auth-left-brand { font-size: 32px; font-weight: 700; margin-bottom: 16px; }
.auth-left-brand i { color: var(--accent); }
.auth-left h2 { font-size: 28px; font-weight: 600; margin-bottom: 16px; }
.auth-left p { opacity: 0.8; line-height: 1.8; max-width: 360px; text-align: center; }
.auth-left-features { margin-top: 40px; text-align: left; }
.auth-left-features li {
  list-style: none; display: flex; align-items: center; gap: 12px;
  margin-bottom: 14px; font-size: 15px; opacity: 0.9;
}
.auth-left-features li i { color: var(--accent); font-size: 18px; width: 24px; }

.auth-right {
  display: flex; align-items: center; justify-content: center;
  padding: 60px 40px;
}
.auth-box { width: 100%; max-width: 440px; }.auth-box h1 { font-size: 26px; font-weight: 700; color: var(--primary); margin-bottom: 6px; }
.auth-box p { color: var(--text-muted); margin-bottom: 32px; }

/* ===================== FORMS ===================== */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-weight: 600; font-size: 13px; color: var(--text); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.5px; }
.form-control {
  width: 100%; padding: 13px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font); font-size: 15px; color: var(--text);
  background: #fff; transition: var(--transition);
  outline: none;
}
.form-control:focus { border-color: var(--primary-light); box-shadow: 0 0 0 3px var(--primary-glow); }
.form-control::placeholder { color: #b0bec5; }
.input-with-icon { position: relative; }
.input-with-icon .form-control { padding-left: 44px; }
.input-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--text-muted); font-size: 16px; }
.input-eye { position: absolute; right: 14px; top: 50%; transform: translateY(-50%); color: var(--text-muted); cursor: pointer; font-size: 16px; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 28px; border-radius: var(--radius-sm); font-family: var(--font); font-size: 15px; font-weight: 600; cursor: pointer; border: none; transition: var(--transition); text-decoration: none; }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(30,58,95,0.3); }
.btn-accent { background: linear-gradient(135deg, var(--accent), var(--accent-dark)); color: #fff; }
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,201,167,0.3); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #c0392b; }
.btn-outline { background: transparent; border: 1.5px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-glow); }
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.6; cursor: not-allowed; transform: none !important; }

.form-footer { text-align: center; margin-top: 24px; color: var(--text-muted); font-size: 14px; }
.form-footer a { color: var(--primary); font-weight: 600; text-decoration: none; }

/* ===================== LANDING PAGE ===================== */
.hero {
  background: linear-gradient(160deg, var(--primary) 0%, var(--primary-light) 60%, #1a5276 100%);
  color: #fff; padding: 100px 32px 80px;
  text-align: center; position: relative; overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at 30% 50%, rgba(0,201,167,0.2) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 50%, rgba(255,255,255,0.05) 0%, transparent 60%);
}
.hero-content { position: relative; max-width: 760px; margin: 0 auto; }
.hero-badge { display: inline-block; background: rgba(0,201,167,0.2); border: 1px solid rgba(0,201,167,0.4); color: var(--accent); padding: 6px 18px; border-radius: 40px; font-size: 13px; font-weight: 600; margin-bottom: 24px; letter-spacing: 1px; text-transform: uppercase; }
.hero h1 { font-size: clamp(28px, 5vw, 60px); font-weight: 700; line-height: 1.15; margin-bottom: 20px; }
.hero h1 span { color: var(--accent); }
.hero p { font-size: clamp(15px, 2.5vw, 18px); opacity: 0.85; margin-bottom: 40px; max-width: 540px; margin-left: auto; margin-right: auto; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-hero-primary { background: var(--accent); color: #fff; padding: 16px 40px; border-radius: var(--radius); font-size: 16px; font-weight: 700; text-decoration: none; transition: var(--transition); display: inline-flex; align-items: center; gap: 10px; }
.btn-hero-primary:hover { background: var(--accent-dark); transform: translateY(-3px); box-shadow: 0 10px 30px rgba(0,201,167,0.4); }
.btn-hero-secondary { background: rgba(255,255,255,0.15); color: #fff; padding: 16px 40px; border-radius: var(--radius); font-size: 16px; font-weight: 600; text-decoration: none; transition: var(--transition); border: 1px solid rgba(255,255,255,0.3); }
.btn-hero-secondary:hover { background: rgba(255,255,255,0.25); transform: translateY(-3px); }

.stats-bar { background: #fff; padding: 40px 32px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; box-shadow: var(--shadow); }
.stat-item h3 { font-size: 32px; font-weight: 700; color: var(--primary); }
.stat-item p { color: var(--text-muted); font-size: 14px; }

.section { padding: 80px 32px; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 { font-size: clamp(26px, 4vw, 36px); font-weight: 700; color: var(--primary); margin-bottom: 12px; }
.section-header p { color: var(--text-muted); font-size: 17px; max-width: 540px; margin: 0 auto; }

.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; max-width: 1100px; margin: 0 auto; }
.feature-card { background: #fff; border-radius: var(--radius); padding: 32px; border: 1px solid var(--border); transition: var(--transition); }
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: var(--primary-light); }
.feature-icon { width: 56px; height: 56px; background: linear-gradient(135deg, var(--primary), var(--primary-light)); border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 22px; color: #fff; margin-bottom: 20px; }
.feature-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; color: var(--primary); }
.feature-card p { color: var(--text-muted); font-size: 14px; line-height: 1.7; }

/* ===================== DASHBOARD ===================== */
.dashboard-layout { display: grid; grid-template-columns: 260px 1fr; min-height: calc(100vh - 96px); }
.sidebar {
  background: var(--bg-sidebar);
  padding: 24px 0;
  position: sticky; top: 96px; height: calc(100vh - 96px);
  overflow-y: auto;
}
.sidebar-section { padding: 8px 16px; margin-bottom: 4px; }
.sidebar-label { font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 1.5px; color: rgba(255,255,255,0.3); padding: 12px 16px 6px; }
.sidebar-link {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 20px; border-radius: var(--radius-sm);
  color: rgba(255,255,255,0.65); text-decoration: none;
  font-size: 14px; font-weight: 500; transition: var(--transition);
  margin: 2px 8px;
}
.sidebar-link:hover, .sidebar-link.active {
  background: rgba(255,255,255,0.1); color: #fff;
}
.sidebar-link.active { background: rgba(45,106,159,0.4); color: #fff; border-left: 3px solid var(--accent); }
.sidebar-link i { width: 20px; font-size: 15px; }

.main-content { padding: 32px; }
.page-header { margin-bottom: 32px; }
.page-header h1 { font-size: 26px; font-weight: 700; color: var(--primary); }
.page-header p { color: var(--text-muted); margin-top: 4px; }

/* Cards */
.card { background: #fff; border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; box-shadow: var(--shadow); }
.card-header { padding: 20px 24px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.card-header h2 { font-size: 17px; font-weight: 600; color: var(--primary); }
.card-body { padding: 24px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* Stat cards */
.stat-card { background: #fff; border-radius: var(--radius); padding: 24px; border: 1px solid var(--border); display: flex; align-items: center; gap: 20px; transition: var(--transition); }
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.stat-card-icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 22px; color: #fff; flex-shrink: 0; }
.stat-card-icon.blue { background: linear-gradient(135deg, var(--primary), var(--primary-light)); }
.stat-card-icon.green { background: linear-gradient(135deg, #27ae60, var(--accent)); }
.stat-card-icon.orange { background: linear-gradient(135deg, #e67e22, var(--warning)); }
.stat-card-icon.red { background: linear-gradient(135deg, #c0392b, var(--danger)); }
.stat-card-info h3 { font-size: 28px; font-weight: 700; color: var(--text); }
.stat-card-info p { color: var(--text-muted); font-size: 13px; }

/* Course cards */
.courses-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 24px; }
.course-card { background: #fff; border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden; transition: var(--transition); }
.course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.course-card-img { height: 160px; background: linear-gradient(135deg, var(--primary), var(--primary-light)); display: flex; align-items: center; justify-content: center; font-size: 48px; color: rgba(255,255,255,0.8); }
.course-card-img img { width: 100%; height: 100%; object-fit: cover; }
.course-card-body { padding: 20px; }
.course-card-body h3 { font-size: 17px; font-weight: 600; color: var(--primary); margin-bottom: 8px; }
.course-card-body p { color: var(--text-muted); font-size: 13px; margin-bottom: 16px; }
.course-badge { display: inline-block; padding: 4px 12px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.badge-locked { background: var(--danger-light); color: var(--danger); }
.badge-active { background: var(--success-light); color: #27ae60; }
.badge-pending { background: var(--warning-light); color: var(--warning); }

/* ===================== TEST PAGE ===================== */
.test-layout { display: grid; grid-template-columns: 1fr 320px; gap: 24px; }
.mcq-card { background: #fff; border-radius: var(--radius); padding: 32px; border: 1px solid var(--border); box-shadow: var(--shadow); }
.mcq-number { font-size: 13px; font-weight: 600; color: var(--text-muted); margin-bottom: 16px; text-transform: uppercase; letter-spacing: 1px; }
.mcq-question { font-size: 17px; font-weight: 500; line-height: 1.7; margin-bottom: 8px; }
.mcq-question img { max-width: 100%; border-radius: var(--radius-sm); margin-top: 12px; }

.mcq-timer { display: flex; align-items: center; gap: 8px; font-size: 20px; font-weight: 700; font-family: var(--font-mono); color: var(--primary); padding: 10px 20px; background: var(--primary-glow); border-radius: var(--radius-sm); margin-bottom: 24px; }
.mcq-timer.warning { color: var(--danger); background: var(--danger-light); }

.options-list { display: flex; flex-direction: column; gap: 12px; margin-top: 24px; }
.option-item {
  padding: 16px 20px; border-radius: var(--radius-sm);
  border: 2px solid var(--border); cursor: pointer;
  transition: var(--transition); display: flex; align-items: center; gap: 14px;
  font-size: 15px;
}
.option-item:hover { border-color: var(--primary-light); background: var(--primary-glow); }
.option-item.correct { border-color: var(--success); background: var(--success-light); }
.option-item.wrong { border-color: var(--danger); background: var(--danger-light); }
.option-item.disabled { cursor: default; pointer-events: none; }
.option-letter {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--bg); border: 1.5px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700; flex-shrink: 0; transition: var(--transition);
}
.option-item.correct .option-letter { background: var(--success); border-color: var(--success); color: #fff; }
.option-item.wrong .option-letter { background: var(--danger); border-color: var(--danger); color: #fff; }

.explanation-box { margin-top: 20px; padding: 20px; background: #f8f9fa; border-radius: var(--radius-sm); border-left: 4px solid var(--accent); display: none; }
.explanation-box.show { display: block; animation: fadeIn 0.3s ease; }
.explanation-box h4 { font-size: 14px; font-weight: 700; color: var(--accent); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 1px; }

.stats-panel-box { background: #fff; border-radius: var(--radius); padding: 20px; border: 1px solid var(--border); margin-bottom: 20px; }
.option-stat-bar { margin-top: 8px; }
.option-stat-item { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; font-size: 13px; }
.stat-bar-fill { flex: 1; height: 8px; background: var(--bg); border-radius: 4px; overflow: hidden; }
.stat-bar-fill-inner { height: 100%; background: linear-gradient(135deg, var(--primary), var(--accent)); border-radius: 4px; transition: width 0.6s ease; }

.mcq-actions { display: flex; gap: 10px; margin-top: 24px; }

/* Sidebar test panel */
.test-sidebar { }
.test-progress-card { background: #fff; border-radius: var(--radius); padding: 20px; border: 1px solid var(--border); margin-bottom: 16px; }
.progress-ring { display: flex; align-items: center; justify-content: center; margin-bottom: 16px; }
.progress-bar-wrap { margin-bottom: 12px; }
.progress-bar-label { display: flex; justify-content: space-between; font-size: 13px; margin-bottom: 6px; font-weight: 500; }
.progress-bar { height: 8px; background: var(--bg); border-radius: 4px; overflow: hidden; }
.progress-bar-inner { height: 100%; border-radius: 4px; transition: width 0.4s ease; }
.progress-bar-inner.green { background: linear-gradient(90deg, #27ae60, var(--accent)); }
.progress-bar-inner.red { background: linear-gradient(90deg, #c0392b, var(--danger)); }
.progress-bar-inner.blue { background: linear-gradient(90deg, var(--primary), var(--primary-light)); }

.question-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; margin-top: 12px; }
.q-dot {
  width: 32px; height: 32px; border-radius: 6px; display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 600; cursor: pointer; transition: var(--transition);
  background: var(--bg); color: var(--text-muted); border: 1.5px solid var(--border);
}
.q-dot.current { border-color: var(--primary); background: var(--primary-glow); color: var(--primary); }
.q-dot.correct { background: var(--success-light); border-color: var(--success); color: #27ae60; }
.q-dot.wrong { background: var(--danger-light); border-color: var(--danger); color: var(--danger); }
.q-dot.skipped { background: var(--warning-light); border-color: var(--warning); color: var(--warning); }

/* ===================== TABLES ===================== */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
thead th { background: var(--bg); padding: 12px 16px; text-align: left; font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.8px; color: var(--text-muted); white-space: nowrap; }
tbody td { padding: 14px 16px; border-bottom: 1px solid var(--border); font-size: 14px; vertical-align: middle; }
tbody tr:hover { background: rgba(30,58,95,0.02); }
tbody tr:last-child td { border-bottom: none; }

/* ===================== BADGES ===================== */
.tag { display: inline-block; padding: 4px 10px; border-radius: 20px; font-size: 12px; font-weight: 600; }
.tag-green { background: var(--success-light); color: #27ae60; }
.tag-red { background: var(--danger-light); color: var(--danger); }
.tag-orange { background: var(--warning-light); color: var(--warning); }
.tag-blue { background: var(--primary-glow); color: var(--primary-light); }
.tag-gray { background: #f0f0f0; color: #666; }

/* ===================== ADMIN ===================== */
.admin-layout { display: grid; grid-template-columns: 260px 1fr; min-height: 100vh; }
.admin-sidebar {
  background: #0f1f35;
  padding: 0;
  position: sticky; top: 0; height: 100vh;
  overflow-y: auto; display: flex; flex-direction: column;
}
.admin-brand {
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
  display: flex; align-items: center; gap: 12px;
  color: #fff; font-size: 18px; font-weight: 700;
}
.admin-brand i { color: var(--accent); }
.admin-nav { flex: 1; padding: 16px 0; }
.admin-nav-label { font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 1.5px; color: rgba(255,255,255,0.25); padding: 16px 20px 6px; }
.admin-nav-link {
  display: flex; align-items: center; gap: 12px;
  padding: 11px 20px; color: rgba(255,255,255,0.6);
  text-decoration: none; font-size: 14px; font-weight: 500;
  transition: var(--transition); border-left: 3px solid transparent;
}
.admin-nav-link:hover { background: rgba(255,255,255,0.07); color: #fff; }
.admin-nav-link.active { background: rgba(45,106,159,0.25); color: #fff; border-left-color: var(--accent); }
.admin-nav-link i { width: 18px; font-size: 15px; }
.admin-nav-link .nav-badge { margin-left: auto; background: var(--danger); color: #fff; border-radius: 10px; padding: 2px 7px; font-size: 11px; }

.admin-topbar { background: #fff; border-bottom: 1px solid var(--border); padding: 0 32px; height: 64px; display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 8px rgba(0,0,0,0.06); }
.admin-topbar h1 { font-size: 20px; font-weight: 700; color: var(--primary); }

.admin-main { padding: 32px; background: var(--bg); min-height: calc(100vh - 64px); }

/* ===================== MODALS ===================== */
.modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 9000; display: flex; align-items: center; justify-content: center; padding: 20px; opacity: 0; visibility: hidden; transition: var(--transition); backdrop-filter: blur(4px); }
.modal-overlay.open { opacity: 1; visibility: visible; }
.modal { background: #fff; border-radius: var(--radius); max-width: 560px; width: 100%; max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-lg); transform: scale(0.95); transition: var(--transition); }
.modal-overlay.open .modal { transform: scale(1); }
.modal-header { padding: 24px 28px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.modal-header h3 { font-size: 18px; font-weight: 700; color: var(--primary); }
.modal-close { background: none; border: none; font-size: 20px; cursor: pointer; color: var(--text-muted); transition: var(--transition); }
.modal-close:hover { color: var(--danger); }
.modal-body { padding: 28px; }
.modal-footer { padding: 20px 28px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 12px; }

/* ===================== MISC ===================== */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.gap-2 { gap: 16px; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.font-mono { font-family: var(--font-mono); }
.bold { font-weight: 700; }
.w-100 { width: 100%; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
.fade-in { animation: fadeIn 0.4s ease; }

.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state i { font-size: 48px; opacity: 0.3; margin-bottom: 16px; display: block; }
.empty-state h3 { font-size: 18px; color: var(--text); margin-bottom: 8px; }

.divider { border: none; border-top: 1px solid var(--border); margin: 20px 0; }

.select-control { width: 100%; padding: 12px 16px; border: 1.5px solid var(--border); border-radius: var(--radius-sm); font-family: var(--font); font-size: 15px; color: var(--text); background: #fff; cursor: pointer; outline: none; transition: var(--transition); }
.select-control:focus { border-color: var(--primary-light); box-shadow: 0 0 0 3px var(--primary-glow); }

.site-footer { background: #fff; border-top: 1px solid var(--border); padding: 18px 32px; text-align: center; color: var(--text-muted); font-size: 13px; }

/* Pagination */
.pagination { display: flex; gap: 8px; align-items: center; }
.page-btn { width: 36px; height: 36px; border-radius: var(--radius-sm); border: 1.5px solid var(--border); background: #fff; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 500; text-decoration: none; color: var(--text); transition: var(--transition); }
.page-btn:hover, .page-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* Breadcrumb */
.breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-muted); margin-bottom: 20px; }
.breadcrumb a { color: var(--primary); text-decoration: none; }
.breadcrumb-sep { color: #ccc; }

/* Toast */
.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 9999; }
.toast { background: #fff; border-radius: var(--radius-sm); padding: 14px 20px; box-shadow: var(--shadow-lg); font-size: 14px; margin-top: 10px; border-left: 4px solid var(--accent); min-width: 280px; animation: slideUp 0.3s ease; }
@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } }

/* ===================== RESPONSIVE / MOBILE ===================== */

/* Touch-friendly tap targets */
@media (hover: none) {
  .btn, .nav-link, .sidebar-link, .admin-nav-link, .option-item,
  .page-btn, .q-dot { -webkit-tap-highlight-color: transparent; }
  .btn-primary:hover, .btn-accent:hover { transform: none; box-shadow: none; }
  .stat-card:hover, .feature-card:hover, .course-card:hover { transform: none; box-shadow: var(--shadow); }
}

@media (max-width: 1024px) {
  .features-grid { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .admin-layout { grid-template-columns: 220px 1fr; }
  .admin-main { padding: 24px; }
}

@media (max-width: 768px) {
  /* Auth */
  .auth-page { grid-template-columns: 1fr; }
  .auth-left { display: none; }
  .auth-right { padding: 40px 24px; }
  .auth-box h1 { font-size: 22px; }

  /* Layouts */
  .dashboard-layout, .admin-layout { grid-template-columns: 1fr; }
  .sidebar, .admin-sidebar { display: none; }
  .sidebar.mobile-open, .admin-sidebar.mobile-open {
    display: flex; position: fixed; top: 0; left: 0;
    height: 100vh; width: 260px; z-index: 2000;
    box-shadow: 4px 0 20px rgba(0,0,0,0.3);
  }

  /* Navbar */
  .navbar { padding: 0 16px; height: 80px; }
  .nav-logo { height: 60px; max-width: 200px; }
  .nav-logo-text { font-size: 19px; }
  .nav-logo-text i { font-size: 20px; }
  .nav-links { display: none; }
  .nav-links.mobile-open {
    display: flex; flex-direction: column;
    position: fixed; top: 80px; left: 0; right: 0;
    background: rgba(255,255,255,0.98); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 12px 16px 20px; gap: 4px;
    z-index: 999; box-shadow: 0 8px 24px rgba(0,0,0,0.1);
  }
  .nav-link { width: 100%; padding: 12px 16px; font-size: 15px; }
  .btn-primary-sm { width: 100%; text-align: center; justify-content: center; margin-top: 8px; padding: 12px; }
  .nav-user-dropdown { width: 100%; }
  .nav-user-btn { width: 100%; justify-content: flex-start; border-radius: var(--radius-sm); padding: 10px 14px; }
  .dropdown-menu { position: static; opacity: 1; visibility: visible; transform: none;
    box-shadow: none; border: 1px solid var(--border); margin-top: 8px; }
  .mobile-menu-btn { display: flex; }
  .page-wrapper { min-height: calc(100vh - 80px - 56px); }
  .flash-container { top: 92px; }

  /* Grids */
  .stats-bar { grid-template-columns: 1fr 1fr; gap: 16px; padding: 28px 20px; }
  .features-grid, .grid-3, .grid-2 { grid-template-columns: 1fr; gap: 16px; }
  .grid-4 { grid-template-columns: 1fr 1fr; gap: 12px; }
  .courses-grid { grid-template-columns: 1fr; }

  /* Test layout */
  .test-layout { grid-template-columns: 1fr; }
  .test-sidebar { order: -1; }
  .question-grid { grid-template-columns: repeat(8, 1fr); }

  /* Hero */
  .hero { padding: 60px 20px 50px; }
  .hero p { font-size: 15px; }
  .btn-hero-primary, .btn-hero-secondary { padding: 14px 28px; font-size: 15px; width: 100%; justify-content: center; }
  .hero-actions { flex-direction: column; align-items: stretch; gap: 12px; }

  /* Section */
  .section { padding: 50px 20px; }
  .section-header { margin-bottom: 36px; }
  .section-header p { font-size: 15px; }

  /* Content */
  .main-content { padding: 20px 16px; }
  .admin-main { padding: 16px; }
  .admin-topbar { padding: 0 16px; }
  .admin-topbar h1 { font-size: 17px; }
  .page-header h1 { font-size: 22px; }

  /* Cards */
  .card-body { padding: 16px; }
  .card-header { padding: 16px; }
  .mcq-card { padding: 20px 16px; }
  .stat-card { padding: 16px; gap: 14px; }
  .stat-card-info h3 { font-size: 22px; }
  .stat-card-icon { width: 44px; height: 44px; font-size: 18px; }

  /* Modals */
  .modal-overlay { padding: 0; align-items: flex-end; }
  .modal { border-radius: var(--radius) var(--radius) 0 0; max-height: 92vh; max-width: 100%; }
  .modal-header { padding: 20px; }
  .modal-body { padding: 20px; }
  .modal-footer { padding: 16px 20px; flex-wrap: wrap; }
  .modal-footer .btn { flex: 1; justify-content: center; }

  /* Flash / Toast */
  .flash-container { right: 12px; left: 12px; max-width: 100%; width: auto; }
  .toast-container { bottom: 16px; right: 12px; left: 12px; }
  .toast { min-width: unset; width: 100%; }

  /* Forms */
  .form-control { font-size: 16px; } /* Prevents iOS auto-zoom on input focus */
  .select-control { font-size: 16px; }

  /* Tables — horizontal scroll */
  .table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  thead th { white-space: nowrap; }

  /* Pagination */
  .pagination { flex-wrap: wrap; justify-content: center; gap: 6px; }

  /* MCQ actions */
  .mcq-actions { flex-wrap: wrap; }
  .mcq-actions .btn { flex: 1 1 calc(50% - 5px); justify-content: center; }

  /* Footer */
  .site-footer { padding: 16px; font-size: 12px; }
}

@media (max-width: 480px) {
  .grid-4 { grid-template-columns: 1fr; }
  .stats-bar { grid-template-columns: 1fr; }
  .stat-item h3 { font-size: 26px; }
  .question-grid { grid-template-columns: repeat(6, 1fr); }
  .mcq-actions .btn { flex: 1 1 100%; }
  .breadcrumb { font-size: 12px; flex-wrap: wrap; }
  .modal-footer .btn { flex: 1 1 100%; }
}