/* ============================================================
   EDU PLATFORM — style.css
   Design: Refined editorial SaaS — Navy + Amber + Cream
   ============================================================ */

/* ---------- Google Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:wght@600;700&family=DM+Sans:wght@300;400;500;600&display=swap');

/* ---------- CSS Variables ---------- */
:root {
  --navy:       #0b1221;
  --navy-mid:   #162035;
  --navy-light: #1e2d4a;
  --amber:      #f59e0b;
  --amber-dark: #d97706;
  --amber-glow: rgba(245,158,11,0.15);
  --cream:      #fdf8f0;
  --white:      #ffffff;
  --gray-50:    #f8fafc;
  --gray-100:   #f1f5f9;
  --gray-200:   #e2e8f0;
  --gray-400:   #94a3b8;
  --gray-600:   #475569;
  --gray-800:   #1e293b;
  --red:        #ef4444;
  --green:      #22c55e;

  --sidebar-w:  260px;
  --radius:     12px;
  --radius-sm:  8px;
  --shadow:     0 4px 24px rgba(11,18,33,0.08);
  --shadow-lg:  0 12px 48px rgba(11,18,33,0.14);

  --font-head:  'Playfair Display', Georgia, serif;
  --font-body:  'DM Sans', system-ui, sans-serif;

  --transition: 0.22s cubic-bezier(0.4,0,0.2,1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  font-size: 15px;
  color: var(--gray-800);
  background: var(--gray-50);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }
button { cursor: pointer; font-family: var(--font-body); border: none; background: none; }
input, textarea, select { font-family: var(--font-body); }

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--gray-200); border-radius: 99px; }

/* ============================================================
   AUTH PAGES (login.html / register.html)
   ============================================================ */
.auth-root {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
}

/* Left panel — brand */
.auth-brand {
  background: var(--navy);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 64px;
  position: relative;
  overflow: hidden;
}
.auth-brand::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 20% 80%, rgba(245,158,11,0.18) 0%, transparent 70%),
              radial-gradient(ellipse 60% 80% at 80% 20%, rgba(30,45,74,0.8) 0%, transparent 60%);
}
.auth-brand__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 64px;
  position: relative;
  z-index: 1;
}
.auth-brand__logo-mark {
  width: 40px; height: 40px;
  background: var(--amber);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
}
.auth-brand__logo-name {
  font-family: var(--font-head);
  font-size: 22px;
  color: var(--white);
  letter-spacing: 0.01em;
}
.auth-brand__headline {
  font-family: var(--font-head);
  font-size: clamp(32px, 3vw, 48px);
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 20px;
  position: relative; z-index: 1;
}
.auth-brand__headline span { color: var(--amber); }
.auth-brand__sub {
  color: rgba(255,255,255,0.55);
  font-size: 16px;
  line-height: 1.7;
  max-width: 380px;
  position: relative; z-index: 1;
}
.auth-brand__stats {
  display: flex;
  gap: 40px;
  margin-top: 56px;
  position: relative; z-index: 1;
}
.auth-brand__stat-num {
  font-family: var(--font-head);
  font-size: 28px;
  color: var(--amber);
}
.auth-brand__stat-lbl {
  font-size: 13px;
  color: rgba(255,255,255,0.45);
  margin-top: 2px;
}
.auth-brand__deco {
  position: absolute;
  width: 320px; height: 320px;
  border: 1px solid rgba(245,158,11,0.12);
  border-radius: 50%;
  bottom: -80px; right: -80px;
}
.auth-brand__deco2 {
  position: absolute;
  width: 180px; height: 180px;
  border: 1px solid rgba(245,158,11,0.08);
  border-radius: 50%;
  top: 80px; right: 40px;
}

/* Right panel — form */
.auth-form-panel {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 48px 40px;
  background: var(--white);
  overflow-y: auto;
}
.auth-form-box {
  width: 100%;
  max-width: 420px;
}
.auth-form-box h2 {
  font-family: var(--font-head);
  font-size: 30px;
  color: var(--navy);
  margin-bottom: 8px;
}
.auth-form-box p.auth-sub {
  color: var(--gray-400);
  font-size: 14px;
  margin-bottom: 36px;
}
.auth-form-box p.auth-sub a {
  color: var(--amber-dark);
  font-weight: 500;
}
.auth-form-box p.auth-sub a:hover { text-decoration: underline; }

/* Form Elements */
.form-group {
  margin-bottom: 20px;
}
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--gray-600);
  margin-bottom: 7px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--navy);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--amber);
  box-shadow: 0 0 0 3px var(--amber-glow);
}
.form-group input.error,
.form-group select.error { border-color: var(--red); }
.form-group .field-error {
  font-size: 12px;
  color: var(--red);
  margin-top: 5px;
  display: none;
}
.form-group .field-error.visible { display: block; }

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

/* Primary Button */
.btn-primary {
  width: 100%;
  padding: 14px;
  background: var(--navy);
  color: var(--white);
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}
.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(245,158,11,0.15), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}
.btn-primary:hover { background: var(--navy-light); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(11,18,33,0.18); }
.btn-primary:hover::after { opacity: 1; }
.btn-primary:active { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }

/* Secondary Button */
.btn-secondary {
  padding: 10px 20px;
  background: var(--gray-100);
  color: var(--gray-800);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 500;
  transition: background var(--transition), transform var(--transition);
}
.btn-secondary:hover { background: var(--gray-200); transform: translateY(-1px); }

/* Amber Button */
.btn-amber {
  padding: 10px 22px;
  background: var(--amber);
  color: var(--navy);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 600;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn-amber:hover { background: var(--amber-dark); transform: translateY(-1px); box-shadow: 0 4px 14px rgba(245,158,11,0.35); }

/* Alert */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  margin-bottom: 20px;
  display: none;
  align-items: center;
  gap: 10px;
}
.alert.visible { display: flex; }
.alert-error { background: #fef2f2; color: #b91c1c; border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: #15803d; border: 1px solid #bbf7d0; }

/* Loading spinner */
.spinner {
  width: 18px; height: 18px;
  border: 2.5px solid rgba(255,255,255,0.3);
  border-top-color: var(--white);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   APP SHELL (dashboard layout)
   ============================================================ */
.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ---------- Sidebar ---------- */
.sidebar {
  width: var(--sidebar-w);
  background: var(--navy);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
  transition: transform var(--transition);
  overflow-y: auto;
}
.sidebar__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 28px 24px 20px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.sidebar__logo-mark {
  width: 34px; height: 34px;
  background: var(--amber);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}
.sidebar__logo-name {
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--white);
}
.sidebar__user {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.sidebar__avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--navy-light);
  border: 2px solid var(--amber);
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
  font-weight: 600;
  color: var(--amber);
  flex-shrink: 0;
}
.sidebar__user-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--white);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sidebar__user-role {
  font-size: 11px;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Nav */
.sidebar__nav { padding: 16px 12px; flex: 1; }
.sidebar__nav-section {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(255,255,255,0.25);
  padding: 8px 12px 6px;
  margin-top: 8px;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,0.55);
  font-size: 14px;
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
  margin-bottom: 2px;
  cursor: pointer;
}
.nav-item:hover { background: rgba(255,255,255,0.07); color: var(--white); }
.nav-item.active {
  background: var(--amber-glow);
  color: var(--amber);
  border: 1px solid rgba(245,158,11,0.2);
}
.nav-item .nav-icon { font-size: 17px; width: 20px; text-align: center; }
.nav-item .nav-badge {
  margin-left: auto;
  background: var(--amber);
  color: var(--navy);
  font-size: 10px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 99px;
}

.sidebar__bottom {
  padding: 12px 12px 20px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.sidebar__logout {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border-radius: var(--radius-sm);
  color: rgba(255,255,255,0.4);
  font-size: 14px;
  font-weight: 500;
  width: 100%;
  transition: background var(--transition), color var(--transition);
}
.sidebar__logout:hover { background: rgba(239,68,68,0.1); color: #f87171; }

/* ---------- Main Content ---------- */
.main-content {
  margin-left: var(--sidebar-w);
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Topbar */
.topbar {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: 0 32px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}
.topbar__left { display: flex; align-items: center; gap: 16px; }
.topbar__title {
  font-family: var(--font-head);
  font-size: 20px;
  color: var(--navy);
}
.topbar__breadcrumb {
  font-size: 13px;
  color: var(--gray-400);
  display: flex;
  align-items: center;
  gap: 6px;
}
.topbar__breadcrumb a { color: var(--amber-dark); }
.topbar__breadcrumb a:hover { text-decoration: underline; }
.topbar__right { display: flex; align-items: center; gap: 16px; }

.topbar-search {
  display: flex;
  align-items: center;
  background: var(--gray-100);
  border-radius: 99px;
  padding: 8px 16px;
  gap: 8px;
  width: 220px;
  border: 1.5px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}
.topbar-search:focus-within { background: var(--white); border-color: var(--amber); }
.topbar-search input {
  background: none;
  border: none;
  outline: none;
  font-size: 13.5px;
  width: 100%;
  color: var(--navy);
}
.topbar-search .search-icon { color: var(--gray-400); font-size: 15px; }

.menu-toggle {
  display: none;
  width: 38px; height: 38px;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  align-items: center; justify-content: center;
  font-size: 18px;
  cursor: pointer;
}
.sidebar-peek-toggle {
  display: none;
  width: 38px;
  height: 38px;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  font-size: 16px;
  color: var(--navy);
  border: 1px solid var(--gray-200);
}

/* Page Body */
.page-body {
  padding: 32px;
  flex: 1;
}

body.student-shell .main-content {
  margin-left: 0;
}
body.student-shell .sidebar {
  transform: translateX(-100%);
  box-shadow: var(--shadow-lg);
}
body.student-shell .sidebar.open {
  transform: translateX(0);
}
body.student-shell .sidebar-peek-toggle {
  display: inline-flex;
}
body.student-shell .nav-item .nav-icon,
body.student-shell .sidebar__logout .nav-icon {
  width: 24px;
  height: 24px;
  border-radius: 0;
  background: transparent;
  color: var(--amber);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0;
}
body.student-shell .nav-item.active .nav-icon {
  color: var(--amber);
}

/* ============================================================
   SHARED COMPONENTS
   ============================================================ */

/* Stats row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}
.stat-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  position: relative;
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--amber);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}
.stat-card:hover::before { transform: scaleX(1); }
.stat-card__icon {
  font-size: 24px;
  margin-bottom: 14px;
}
.stat-card__num {
  font-family: var(--font-head);
  font-size: 32px;
  color: var(--navy);
  line-height: 1;
}
.stat-card__label {
  font-size: 13px;
  color: var(--gray-400);
  margin-top: 6px;
}
.stat-card__change {
  font-size: 12px;
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.stat-card__change.up { color: var(--green); }
.stat-card__change.down { color: var(--red); }

/* Section header */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.section-title {
  font-family: var(--font-head);
  font-size: 22px;
  color: var(--navy);
}
.section-link {
  font-size: 13px;
  color: var(--amber-dark);
  font-weight: 500;
}
.section-link:hover { text-decoration: underline; }

/* Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}

/* Course Card */
.course-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-200);
  transition: transform var(--transition), box-shadow var(--transition);
  cursor: pointer;
}
.course-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.course-card__thumb {
  height: 150px;
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 40px;
  position: relative;
  overflow: hidden;
}
.course-card__thumb::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 60%, rgba(245,158,11,0.25) 0%, transparent 60%);
}
.course-card__thumb-label {
  position: absolute;
  top: 12px; right: 12px;
  background: var(--amber);
  color: var(--navy);
  font-size: 11px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 99px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  z-index: 1;
}
.course-card__body { padding: 20px; }
.course-card__category {
  font-size: 11px;
  font-weight: 600;
  color: var(--amber-dark);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}
.course-card__title {
  font-family: var(--font-head);
  font-size: 17px;
  color: var(--navy);
  line-height: 1.4;
  margin-bottom: 10px;
}
.course-card__meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12.5px;
  color: var(--gray-400);
  margin-bottom: 14px;
}
.course-card__meta span { display: flex; align-items: center; gap: 4px; }
.course-card__progress-bar {
  height: 4px;
  background: var(--gray-100);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 8px;
}
.course-card__progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--amber), var(--amber-dark));
  border-radius: 99px;
  transition: width 0.8s ease;
}
.course-card__progress-label {
  font-size: 11px;
  color: var(--gray-400);
  display: flex;
  justify-content: space-between;
}
.course-card__footer {
  padding: 14px 20px;
  border-top: 1px solid var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.course-card__author {
  font-size: 12.5px;
  color: var(--gray-600);
  display: flex;
  align-items: center;
  gap: 6px;
}
.course-card__avatar-sm {
  width: 24px; height: 24px;
  border-radius: 50%;
  background: var(--navy);
  color: var(--amber);
  font-size: 10px;
  font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}

/* Table */
.table-wrap {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
}
.data-table th {
  padding: 14px 20px;
  text-align: left;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-400);
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
}
.data-table td {
  padding: 14px 20px;
  font-size: 14px;
  color: var(--gray-800);
  border-bottom: 1px solid var(--gray-100);
  vertical-align: middle;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--gray-50); }

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 12px;
  font-weight: 600;
}
.badge-amber { background: #fef3c7; color: #92400e; }
.badge-green { background: #dcfce7; color: #166534; }
.badge-red   { background: #fee2e2; color: #991b1b; }
.badge-blue  { background: #dbeafe; color: #1e40af; }
.badge-gray  { background: var(--gray-100); color: var(--gray-600); }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 64px 24px;
  color: var(--gray-400);
}
.empty-state .empty-icon { font-size: 48px; margin-bottom: 16px; }
.empty-state h3 { font-family: var(--font-head); font-size: 20px; color: var(--gray-600); margin-bottom: 8px; }
.empty-state p { font-size: 14px; }

/* Loading skeleton */
.skeleton {
  background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-200) 50%, var(--gray-100) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer { to { background-position: -200% 0; } }
.skeleton-text { height: 14px; margin-bottom: 8px; }
.skeleton-card { height: 220px; border-radius: var(--radius); }

/* ============================================================
   COURSES PAGE
   ============================================================ */
.page-header {
  margin-bottom: 28px;
}
.page-header h1 {
  font-family: var(--font-head);
  font-size: 28px;
  color: var(--navy);
  margin-bottom: 4px;
}
.page-header p { color: var(--gray-400); font-size: 14px; }

.filter-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.filter-bar input {
  flex: 1;
  min-width: 200px;
  padding: 10px 16px;
  border: 1.5px solid var(--gray-200);
  border-radius: 99px;
  font-size: 14px;
  outline: none;
  transition: border-color var(--transition);
}
.filter-bar input:focus { border-color: var(--amber); }
.filter-pill {
  padding: 8px 18px;
  border-radius: 99px;
  border: 1.5px solid var(--gray-200);
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-600);
  transition: all var(--transition);
  cursor: pointer;
  background: var(--white);
}
.filter-pill:hover,
.filter-pill.active {
  background: var(--navy);
  color: var(--white);
  border-color: var(--navy);
}

/* ============================================================
   COURSE DETAILS PAGE
   ============================================================ */
.course-hero {
  background: var(--navy);
  border-radius: var(--radius);
  padding: 40px;
  margin-bottom: 28px;
  display: flex;
  align-items: flex-start;
  gap: 32px;
  position: relative;
  overflow: hidden;
}
.course-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 80% at 80% 50%, rgba(245,158,11,0.12) 0%, transparent 60%);
}
.course-hero__icon {
  font-size: 64px;
  flex-shrink: 0;
  position: relative; z-index: 1;
}
.course-hero__content { position: relative; z-index: 1; }
.course-hero__category {
  font-size: 12px;
  font-weight: 700;
  color: var(--amber);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.course-hero__title {
  font-family: var(--font-head);
  font-size: clamp(22px, 3vw, 30px);
  color: var(--white);
  margin-bottom: 12px;
  line-height: 1.25;
}
.course-hero__desc {
  color: rgba(255,255,255,0.6);
  font-size: 15px;
  line-height: 1.7;
  max-width: 560px;
  margin-bottom: 20px;
}
.course-hero__tags { display: flex; gap: 8px; flex-wrap: wrap; }
.course-hero__tag {
  padding: 4px 12px;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 99px;
  font-size: 12px;
  color: rgba(255,255,255,0.6);
}

.course-details-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 24px;
  align-items: start;
}

.lessons-list { display: flex; flex-direction: column; gap: 10px; }
.lesson-item {
  background: var(--white);
  border-radius: var(--radius-sm);
  border: 1px solid var(--gray-200);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: all var(--transition);
}
.lesson-item:hover { border-color: var(--amber); transform: translateX(4px); }
.lesson-item.completed { border-color: var(--green); }
.lesson-item.locked { opacity: 0.5; cursor: not-allowed; }
.lesson-num {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--gray-100);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--gray-400);
  flex-shrink: 0;
}
.lesson-item.completed .lesson-num { background: #dcfce7; color: #166534; }
.lesson-item.active .lesson-num { background: var(--amber-glow); color: var(--amber-dark); }
.lesson-info { flex: 1; }
.lesson-title { font-size: 14.5px; font-weight: 500; color: var(--navy); margin-bottom: 3px; }
.lesson-meta { font-size: 12px; color: var(--gray-400); display: flex; gap: 10px; }
.lesson-type { margin-left: auto; }

/* Side info card */
.info-card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  padding: 24px;
  box-shadow: var(--shadow);
}
.info-card h3 {
  font-family: var(--font-head);
  font-size: 17px;
  color: var(--navy);
  margin-bottom: 16px;
}
.info-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--gray-100);
  font-size: 14px;
}
.info-row:last-child { border-bottom: none; }
.info-row-label { color: var(--gray-400); }
.info-row-value { font-weight: 600; color: var(--navy); }

/* ============================================================
   VIDEO LESSON PAGE
   ============================================================ */
.video-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 24px;
  align-items: start;
}
.video-player-wrap {
  background: var(--navy);
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 16/9;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: var(--shadow-lg);
}
.video-placeholder {
  text-align: center;
  color: rgba(255,255,255,0.5);
}
.video-placeholder .play-btn {
  width: 70px; height: 70px;
  background: var(--amber);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 28px;
  margin: 0 auto 16px;
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition);
  color: var(--navy);
}
.video-placeholder .play-btn:hover { transform: scale(1.08); box-shadow: 0 0 0 8px rgba(245,158,11,0.2); }
.video-player-wrap video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.video-info { padding: 20px 0; }
.video-info h2 {
  font-family: var(--font-head);
  font-size: 22px;
  color: var(--navy);
  margin-bottom: 10px;
}
.video-info p { font-size: 14.5px; color: var(--gray-600); line-height: 1.7; }
.video-controls { display: flex; gap: 10px; margin-top: 16px; }

.lessons-sidebar {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.lessons-sidebar-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--gray-200);
  font-family: var(--font-head);
  font-size: 16px;
  color: var(--navy);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.lessons-sidebar-list { overflow-y: auto; max-height: 560px; }
.sidebar-lesson {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  cursor: pointer;
  border-bottom: 1px solid var(--gray-100);
  transition: background var(--transition);
}
.sidebar-lesson:hover { background: var(--gray-50); }
.sidebar-lesson.active { background: var(--amber-glow); }
.sidebar-lesson-num {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--gray-100);
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 700; color: var(--gray-400);
  flex-shrink: 0;
}
.sidebar-lesson.active .sidebar-lesson-num { background: var(--amber); color: var(--navy); }
.sidebar-lesson.completed .sidebar-lesson-num { background: #dcfce7; color: var(--green); }
.sidebar-lesson-title { font-size: 13px; color: var(--navy); font-weight: 500; }
.sidebar-lesson-dur { font-size: 11px; color: var(--gray-400); margin-top: 2px; }

/* ============================================================
   EXAMS PAGE
   ============================================================ */
.exams-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.exam-card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}
.exam-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.exam-card__icon {
  width: 48px; height: 48px;
  background: var(--amber-glow);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 24px;
  margin-bottom: 16px;
}
.exam-card__title {
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--navy);
  margin-bottom: 6px;
}
.exam-card__course {
  font-size: 13px;
  color: var(--amber-dark);
  margin-bottom: 14px;
  font-weight: 500;
}
.exam-card__details {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
  flex: 1;
}
.exam-detail-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--gray-600);
}
.exam-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--gray-100);
}

/* ============================================================
   TAKE EXAM PAGE
   ============================================================ */
.exam-layout {
  max-width: 760px;
  margin: 0 auto;
}
.exam-header-card {
  background: var(--navy);
  border-radius: var(--radius);
  padding: 28px 32px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}
.exam-header-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 80% 50%, rgba(245,158,11,0.12), transparent 60%);
}
.exam-header-card__info { position: relative; z-index: 1; }
.exam-header-card__title {
  font-family: var(--font-head);
  font-size: 22px;
  color: var(--white);
  margin-bottom: 6px;
}
.exam-header-card__sub { font-size: 13px; color: rgba(255,255,255,0.5); }
.exam-timer {
  position: relative; z-index: 1;
  text-align: center;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-sm);
  padding: 14px 24px;
}
.exam-timer__time {
  font-family: var(--font-head);
  font-size: 28px;
  color: var(--amber);
  letter-spacing: 0.05em;
}
.exam-timer__label { font-size: 11px; color: rgba(255,255,255,0.4); text-transform: uppercase; letter-spacing: 0.08em; }

.exam-progress-bar {
  background: var(--gray-200);
  border-radius: 99px;
  height: 6px;
  margin-bottom: 24px;
  overflow: hidden;
}
.exam-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--amber), var(--amber-dark));
  border-radius: 99px;
  transition: width 0.5s ease;
}

.question-card {
  background: var(--white);
  border-radius: var(--radius);
  border: 1px solid var(--gray-200);
  padding: 32px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
  animation: slideUp 0.3s ease;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.question-num {
  font-size: 12px;
  font-weight: 700;
  color: var(--amber-dark);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.question-text {
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--navy);
  line-height: 1.5;
  margin-bottom: 24px;
}
.options-list { display: flex; flex-direction: column; gap: 10px; }
.option-label {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 20px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}
.option-label:hover { border-color: var(--amber); background: var(--amber-glow); }
.option-label input[type="radio"] { display: none; }
.option-radio {
  width: 20px; height: 20px;
  border-radius: 50%;
  border: 2px solid var(--gray-200);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
  transition: all var(--transition);
}
.option-label input:checked ~ .option-radio { border-color: var(--amber); }
.option-radio::after {
  content: '';
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--amber);
  opacity: 0;
  transition: opacity var(--transition);
}
.option-label input:checked ~ .option-radio::after { opacity: 1; }
.option-label:has(input:checked) {
  border-color: var(--amber);
  background: var(--amber-glow);
}
.option-text { font-size: 14.5px; color: var(--gray-800); line-height: 1.5; }
.option-label.correct { border-color: var(--green); background: #f0fdf4; }
.option-label.wrong  { border-color: var(--red); background: #fef2f2; }

.exam-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 8px;
}
.question-dots {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  justify-content: center;
}
.q-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--gray-200);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}
.q-dot.active { background: var(--amber); transform: scale(1.3); }
.q-dot.answered { background: var(--navy); }

/* Results card */
.result-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 48px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--gray-200);
  max-width: 520px;
  margin: 0 auto;
  animation: slideUp 0.5s ease;
}
.result-score-circle {
  width: 130px; height: 130px;
  border-radius: 50%;
  background: conic-gradient(var(--amber) var(--pct), var(--gray-100) 0);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 24px;
  position: relative;
}
.result-score-circle::before {
  content: '';
  position: absolute;
  inset: 14px;
  border-radius: 50%;
  background: var(--white);
}
.result-score-num {
  position: relative; z-index: 1;
  font-family: var(--font-head);
  font-size: 32px;
  color: var(--navy);
}
.result-title {
  font-family: var(--font-head);
  font-size: 26px;
  color: var(--navy);
  margin-bottom: 8px;
}
.result-sub { font-size: 14px; color: var(--gray-400); margin-bottom: 28px; }

/* ============================================================
   TEACHER MODALS & FORMS
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11,18,33,0.55);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  width: 100%;
  max-width: 500px;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px) scale(0.97);
  transition: transform var(--transition);
}
.modal-overlay.open .modal { transform: translateY(0) scale(1); }
.modal-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
}
.modal-title {
  font-family: var(--font-head);
  font-size: 20px;
  color: var(--navy);
}
.modal-close {
  width: 32px; height: 32px;
  background: var(--gray-100);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
  color: var(--gray-400);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}
.modal-close:hover { background: var(--gray-200); color: var(--navy); }
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 24px;
}

/* ============================================================
   LANDING PAGE
   ============================================================ */
.landing-body {
  background:
    radial-gradient(circle at top left, rgba(245,158,11,0.12), transparent 30%),
    linear-gradient(180deg, #fffdf9 0%, #f7f9fc 45%, #eef3f8 100%);
  color: var(--navy);
}
.landing-header,
.landing-main {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}
.landing-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0;
}
.landing-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-head);
  font-size: 22px;
}
.landing-brand__mark {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--navy);
  color: var(--amber);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}
.landing-nav,
.landing-actions,
.hero-actions,
.hero-points,
.landing-metrics,
.feature-grid,
.pricing-grid,
.journey-grid,
.faq-list {
  display: flex;
}
.landing-nav {
  align-items: center;
  gap: 24px;
  color: var(--gray-600);
  font-size: 14px;
}
.landing-nav a:hover { color: var(--navy); }
.landing-actions {
  align-items: center;
  gap: 12px;
}
.landing-main {
  padding-bottom: 64px;
}
.hero-section {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 34px;
  align-items: center;
  padding: 34px 0 24px;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(245,158,11,0.12);
  color: var(--amber-dark);
  border: 1px solid rgba(245,158,11,0.18);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}
.hero-title {
  font-family: var(--font-head);
  font-size: clamp(38px, 5vw, 62px);
  line-height: 1.06;
  max-width: 12ch;
  margin-bottom: 18px;
}
.hero-copy,
.section-copy p,
.feature-card p,
.price-card p,
.faq-item p {
  color: var(--gray-600);
  line-height: 1.8;
}
.hero-copy {
  font-size: 17px;
  max-width: 58ch;
}
.hero-actions {
  gap: 14px;
  margin: 28px 0 20px;
}
.hero-points {
  gap: 16px;
  flex-wrap: wrap;
}
.hero-point {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--gray-600);
  font-size: 14px;
}
.hero-point span {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(34,197,94,0.12);
  color: var(--green);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
}
.hero-panel {
  display: grid;
  gap: 16px;
}
.hero-panel__card {
  background: rgba(255,255,255,0.85);
  border: 1px solid rgba(255,255,255,0.7);
  border-radius: 24px;
  padding: 24px;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(14px);
}
.hero-panel__card--dark {
  background: linear-gradient(135deg, #111c32, #1d2c4c);
  color: var(--white);
}
.mini-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--gray-400);
  font-weight: 700;
  margin-bottom: 18px;
}
.hero-panel__card--dark .mini-label {
  color: rgba(255,255,255,0.5);
}
.hero-stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.hero-stat-card {
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 18px;
  padding: 18px;
}
.hero-stat-card strong,
.metric-box strong,
.price-tag {
  display: block;
  font-family: var(--font-head);
}
.hero-stat-card strong {
  font-size: 28px;
  margin-bottom: 4px;
}
.hero-stat-card span,
.metric-box span {
  color: rgba(255,255,255,0.62);
  font-size: 13px;
}
.student-preview {
  display: grid;
  gap: 12px;
}
.student-preview__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 16px;
  background: var(--gray-50);
  border-radius: 14px;
  border: 1px solid var(--gray-200);
}
.landing-metrics {
  gap: 18px;
  margin: 24px 0 48px;
}
.metric-box {
  flex: 1;
  background: rgba(255,255,255,0.75);
  border: 1px solid rgba(11,18,33,0.08);
  border-radius: 20px;
  padding: 22px 24px;
  box-shadow: var(--shadow);
}
.metric-box strong {
  font-size: 28px;
  margin-bottom: 8px;
}
.metric-box span {
  color: var(--gray-600);
}
.landing-section {
  padding: 42px 0;
}
.section-copy {
  max-width: 760px;
  margin-bottom: 28px;
}
.section-copy h2 {
  font-family: var(--font-head);
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.12;
  margin-bottom: 12px;
}
.feature-grid,
.pricing-grid,
.journey-grid,
.faq-list {
  gap: 20px;
  flex-wrap: wrap;
}
.feature-card,
.price-card,
.journey-card,
.faq-item {
  background: rgba(255,255,255,0.86);
  border-radius: 20px;
  border: 1px solid rgba(11,18,33,0.08);
  box-shadow: var(--shadow);
}
.feature-card {
  flex: 1 1 300px;
  padding: 24px;
}
.feature-icon {
  width: 54px;
  height: 54px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--navy), var(--navy-light));
  color: var(--amber);
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}
.feature-card h3,
.price-card h3,
.journey-card h3,
.faq-item h3 {
  font-family: var(--font-head);
  font-size: 24px;
  margin-bottom: 12px;
}
.price-card {
  flex: 1 1 320px;
  padding: 28px;
}
.price-card--featured {
  background: linear-gradient(180deg, #fff8ea 0%, #ffffff 100%);
  border-color: rgba(245,158,11,0.3);
  transform: translateY(-6px);
}
.price-tag {
  font-size: 26px;
  margin: 18px 0 16px;
  color: var(--navy);
}
.price-list {
  display: grid;
  gap: 10px;
  color: var(--gray-600);
  margin-bottom: 24px;
}
.price-list li::before {
  content: '\2713';
  color: var(--green);
  margin-right: 10px;
}
.journey-card {
  flex: 1 1 420px;
  padding: 26px;
}
.journey-list {
  display: grid;
  gap: 12px;
  color: var(--gray-600);
  padding-left: 20px;
}
.faq-item {
  flex: 1 1 340px;
  padding: 24px;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .hero-section {
    grid-template-columns: 1fr;
  }
  .course-details-grid { grid-template-columns: 1fr; }
  .video-layout { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .landing-header {
    flex-wrap: wrap;
    width: min(1180px, calc(100% - 28px));
  }
  .landing-main {
    width: min(1180px, calc(100% - 28px));
  }
  .landing-nav {
    order: 3;
    width: 100%;
    justify-content: space-between;
    gap: 10px;
    flex-wrap: wrap;
  }
  .landing-actions {
    width: 100%;
  }
  .landing-actions a {
    flex: 1;
    text-align: center;
  }
  .hero-actions,
  .landing-metrics,
  .feature-grid,
  .pricing-grid,
  .journey-grid,
  .faq-list {
    flex-direction: column;
  }
  .hero-title {
    max-width: none;
  }
  .auth-root { grid-template-columns: 1fr; }
  .auth-brand { display: none; }
  .auth-form-panel { padding: 40px 24px; }

  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }

  .topbar { padding: 0 20px; }
  .menu-toggle { display: flex; }
  .sidebar-peek-toggle { display: none !important; }
  .topbar-search { display: none; }

  .page-body { padding: 20px; }

  .stats-row { grid-template-columns: 1fr 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .course-hero { flex-direction: column; gap: 16px; }
  .course-hero__icon { font-size: 40px; }
  .exam-header-card { flex-direction: column; gap: 16px; }
  .exam-layout { max-width: 100%; }

  .cards-grid { grid-template-columns: 1fr; }
  #student-settings-grid { grid-template-columns: 1fr !important; }
}


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

/* ============================================================
   TOAST NOTIFICATIONS
   ============================================================ */
.toast-container {
  position: fixed;
  bottom: 24px; right: 24px;
  z-index: 999;
  display: flex;
  flex-direction: column;
  gap: 10px;
  pointer-events: none;
}
.toast {
  background: var(--navy);
  color: var(--white);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 240px;
  animation: toastIn 0.3s ease;
  pointer-events: all;
  border-left: 3px solid var(--amber);
}
.toast.success { border-left-color: var(--green); }
.toast.error   { border-left-color: var(--red); }
@keyframes toastIn {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes toastOut {
  to { opacity: 0; transform: translateX(20px); }
}

/* ============================================================
   PAGE FADE-IN
   ============================================================ */
.page-fade { animation: pageFade 0.4s ease; }
@keyframes pageFade {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}