/* ============================================
   LearnSphere — Design Signature ER RAISSI Aiman
   https://erraissiaiman.com
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:ital,wght@0,300;0,400;0,500;0,600;0,700;0,800;1,400&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* =====================
   Root Variables
   ===================== */
:root {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Space Grotesk', var(--font-sans);

  /* Palette de couleurs — chaude & originale */
  --c-bg:        #0d0f14;
  --c-bg2:       #13161e;
  --c-surface:   #191c27;
  --c-surface2:  #1e2232;
  --c-border:    rgba(255,255,255,0.07);
  --c-border2:   rgba(255,255,255,0.13);

  --c-primary:   #5b6af5;   /* indigo vif */
  --c-primary2:  #8b5cf6;   /* violet */
  --c-accent:    #f97316;   /* orange chaud */
  --c-teal:      #14b8a6;   /* teal */

  --c-text:      #e8eaf2;
  --c-muted:     #7c829a;
  --c-success:   #22c55e;
  --c-danger:    #f43f5e;
  --c-warning:   #fb923c;

  --grad-primary:  linear-gradient(135deg, #5b6af5 0%, #8b5cf6 100%);
  --grad-accent:   linear-gradient(135deg, #f97316 0%, #ef4444 100%);
  --grad-teal:     linear-gradient(135deg, #14b8a6 0%, #3b82f6 100%);
  --grad-page:     radial-gradient(ellipse 80% 60% at 50% -10%, rgba(91,106,245,0.18) 0%, transparent 60%),
                   radial-gradient(ellipse 60% 40% at 90% 80%, rgba(139,92,246,0.10) 0%, transparent 50%),
                   var(--c-bg);

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  18px;
  --radius-xl:  26px;

  --shadow-sm:   0 2px 8px rgba(0,0,0,.25);
  --shadow-md:   0 8px 24px rgba(0,0,0,.35);
  --shadow-lg:   0 20px 48px rgba(0,0,0,.45);
  --shadow-glow: 0 0 24px rgba(91,106,245,.35);

  --ease:  cubic-bezier(.23,1,.32,1);
  --t-fast: .18s;
  --t-med:  .32s;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--grad-page);
  background-attachment: fixed;
  color: var(--c-text);
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

main { flex: 1; padding-top: 52px; padding-bottom: 80px; }


h1,h2,h3,h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.2; color: var(--c-text); }
a { color: var(--c-primary); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--c-primary2); }
img { max-width: 100%; }

/* Lucide icons — base */
[data-lucide], .icon {
  display: inline-block;
  vertical-align: middle;
  flex-shrink: 0;
}
[data-lucide] { width: 20px; height: 20px; }
.icon-sm [data-lucide], [data-lucide].icon-sm { width: 16px; height: 16px; }
.icon-lg [data-lucide], [data-lucide].icon-lg { width: 28px; height: 28px; }
.icon-xl [data-lucide], [data-lucide].icon-xl { width: 40px; height: 40px; }
.icon-2xl [data-lucide], [data-lucide].icon-2xl { width: 52px; height: 52px; }

/* =====================
   Layout
   ===================== */
.container { width: 100%; max-width: 1180px; margin: 0 auto; padding-inline: 22px; }

/* =====================
   Navbar
   ===================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 200;
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  background: rgba(13,15,20,.80);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow var(--t-fast), background var(--t-fast);
}
.navbar.scrolled {
  background: rgba(13,15,20,.95);
  box-shadow: 0 4px 32px rgba(0,0,0,.4);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -.4px;
  color: var(--c-text);
  white-space: nowrap;
  flex-shrink: 0;
}
.logo:hover { color: var(--c-text); }
.logo-icon {
  width: 34px; height: 34px;
  background: var(--grad-primary);
  border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-glow);
}
.logo-icon svg { color: #fff; }

/* Center nav (desktop) */
.nav-center {
  display: flex;
  align-items: center;
  gap: 2px;
  flex: 1;
  justify-content: center;
}
.nav-link {
  display: block;
  padding: 7px 14px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--c-muted);
  transition: all var(--t-fast) var(--ease);
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--c-text);
  background: rgba(255,255,255,0.05);
}
.nav-link.active {
  color: var(--c-text);
  background: rgba(91,106,245,0.10);
  box-shadow: inset 0 0 0 1px rgba(91,106,245,0.2);
}

/* Right section */
.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Avatar */
.nav-avatar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px 5px 5px;
  border-radius: var(--radius-md);
  color: var(--c-muted);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--t-fast);
  border: 1px solid transparent;
}
.nav-avatar:hover, .nav-avatar.active {
  color: var(--c-text);
  background: rgba(255,255,255,0.04);
  border-color: var(--c-border);
}
.avatar-circle {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--grad-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 2px 8px rgba(91,106,245,0.35);
}
.avatar-name { font-size: 13px; }

/* --- Lang Switcher --- */
.lang-switcher {
  position: relative;
}
.lang-trigger {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--c-border);
  color: var(--c-muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .3px;
  cursor: pointer;
  transition: all var(--t-fast) var(--ease);
}
.lang-trigger:hover, .lang-switcher.open .lang-trigger {
  color: var(--c-text);
  border-color: rgba(91,106,245,0.4);
  background: rgba(91,106,245,0.08);
}
.lang-chevron {
  transition: transform var(--t-fast) var(--ease);
  flex-shrink: 0;
}
.lang-switcher.open .lang-chevron {
  transform: rotate(180deg);
}
.lang-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 150px;
  background: var(--c-surface);
  border: 1px solid var(--c-border2);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  opacity: 0;
  transform: translateY(-8px) scale(.97);
  pointer-events: none;
  transition: opacity var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
  z-index: 300;
}
.lang-switcher.open .lang-dropdown {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}
.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 500;
  color: var(--c-muted);
  transition: background var(--t-fast), color var(--t-fast);
}
.lang-option:hover {
  background: rgba(255,255,255,0.04);
  color: var(--c-text);
}
.lang-option.active {
  color: var(--c-text);
  background: rgba(91,106,245,0.08);
}
.lang-flag { font-size: 16px; line-height: 1; }
.lang-check { color: var(--c-primary); margin-left: auto; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 6px;
  border-radius: var(--radius-sm);
  width: 36px; height: 36px;
  flex-shrink: 0;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--c-muted);
  border-radius: 2px;
  transition: transform .25s var(--ease), opacity .25s, background .2s;
}
.hamburger:hover span { background: var(--c-text); }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile overlay */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0);
  z-index: 299;
  transition: background .3s;
}
.mobile-overlay.open {
  display: block;
  background: rgba(0,0,0,.6);
}

/* Mobile drawer */
.mobile-drawer {
  position: fixed;
  top: 0; right: 0;
  width: min(340px, 90vw);
  height: 100%;
  background: var(--c-surface);
  border-left: 1px solid var(--c-border);
  z-index: 300;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform .32s var(--ease);
  box-shadow: -8px 0 48px rgba(0,0,0,.5);
  overflow-y: auto;
}
.mobile-drawer.open { transform: translateX(0); }

.mobile-drawer-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--c-border);
  flex-shrink: 0;
}
.drawer-close {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  color: var(--c-muted);
  cursor: pointer;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--t-fast);
}
.drawer-close:hover { color: var(--c-text); background: rgba(255,255,255,.08); }

.mobile-nav {
  display: flex;
  flex-direction: column;
  padding: 12px 12px;
  flex: 1;
}
.mobile-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 13px 16px;
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  color: var(--c-muted);
  transition: all var(--t-fast);
}
.mobile-nav-link:hover {
  color: var(--c-text);
  background: rgba(255,255,255,0.05);
}
.mobile-nav-link.active {
  color: var(--c-primary);
  background: rgba(91,106,245,0.1);
  font-weight: 600;
}
.mobile-nav-link svg { flex-shrink: 0; color: inherit; }

.mobile-drawer-footer {
  padding: 16px 20px 24px;
  border-top: 1px solid var(--c-border);
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-shrink: 0;
}
.mobile-lang {
  display: flex;
  gap: 8px;
  margin-bottom: 8px;
}
.mobile-lang-btn {
  flex: 1;
  text-align: center;
  padding: 9px 12px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 600;
  color: var(--c-muted);
  border: 1px solid var(--c-border);
  background: var(--c-bg2);
  transition: all var(--t-fast);
}
.mobile-lang-btn:hover { color: var(--c-text); border-color: var(--c-border2); }
.mobile-lang-btn.active {
  background: rgba(91,106,245,0.12);
  color: var(--c-primary);
  border-color: rgba(91,106,245,0.35);
  font-weight: 700;
}

/* =====================
   Buttons
   ===================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--t-fast) var(--ease);
  white-space: nowrap;
  line-height: 1;
}

.btn-primary {
  background: var(--grad-primary) !important;
  color: #fff !important;
  box-shadow: 0 4px 16px rgba(91,106,245,.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(91,106,245,.55);
  color: #fff !important;
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: var(--c-surface2) !important;
  color: var(--c-text) !important;
  border: 1px solid var(--c-border2) !important;
}

.btn-secondary:hover {
  background: rgba(255,255,255,.09) !important;
  color: var(--c-text) !important;
  border-color: var(--c-border2) !important;
}

.btn-outline {
  background: transparent;
  color: var(--c-primary);
  border: 1.5px solid var(--c-primary);
}
.btn-outline:hover { background: rgba(91,106,245,.1); color: var(--c-primary); }

.btn-danger { background: var(--c-danger); color: #fff; }
.btn-danger:hover { background: #e11d48; color: #fff; transform: translateY(-1px); }

.btn-accent {
  background: var(--grad-accent);
  color: #fff;
  box-shadow: 0 4px 16px rgba(249,115,22,.35);
}
.btn-accent:hover { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(249,115,22,.5); color: #fff; }

.btn-sm { padding: 7px 14px; font-size: 13px; border-radius: 8px; }
.btn-xs { padding: 4px 10px; font-size: 12px; border-radius: 6px; }
.btn-lg { padding: 14px 32px; font-size: 16px; border-radius: 14px; }
.btn-full { width: 100%; }

/* =====================
   Card / Panel
   ===================== */
.card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
}
.card:hover { border-color: var(--c-border2); }
.card-raised { box-shadow: var(--shadow-md); }

/* Legacy alias for backward compat */
.glass-panel { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius-lg); padding: 28px; box-shadow: var(--shadow-md); }

/* =====================
   Forms
   ===================== */
.form-group { margin-bottom: 18px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--c-muted);
  margin-bottom: 7px;
  letter-spacing: .2px;
  text-transform: uppercase;
}
.form-control {
  width: 100%;
  padding: 11px 14px;
  background: var(--c-bg2);
  border: 1.5px solid var(--c-border2);
  border-radius: var(--radius-sm);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 14px;
  transition: border-color var(--t-fast), box-shadow var(--t-fast);
  outline: none;
}
.form-control:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(91,106,245,.15);
}
.form-control::placeholder { color: #3d4259; }
textarea.form-control { resize: vertical; min-height: 110px; line-height: 1.55; }
select.form-control { cursor: pointer; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media(max-width:560px){ .form-row { grid-template-columns: 1fr; } }

.form-hint { font-size: 12px; color: var(--c-muted); margin-top: 5px; }

/* =====================
   Alerts
   ===================== */
.alert {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 18px;
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  font-size: 14px;
  border: 1px solid transparent;
}
.alert-icon { flex-shrink: 0; margin-top: 1px; }
.alert-success { background: rgba(34,197,94,.08); border-color: rgba(34,197,94,.2); color: #4ade80; }
.alert-danger  { background: rgba(244,63,94,.08);  border-color: rgba(244,63,94,.2);  color: #fb7185; }
.alert-warning { background: rgba(251,146,60,.08); border-color: rgba(251,146,60,.2); color: #fdba74; }
.alert-info    { background: rgba(91,106,245,.08); border-color: rgba(91,106,245,.2); color: #818cf8; }

/* =====================
   Hero Section
   ===================== */
.hero {
  padding: 24px 0 64px;
  text-align: center;
  position: relative;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  background: rgba(91,106,245,.12);
  border: 1px solid rgba(91,106,245,.25);
  color: #818cf8;
  padding: 6px 16px;
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 24px;
}
.hero-badge span { width: 6px; height: 6px; border-radius: 50%; background: var(--c-primary); display: inline-block; animation: pulse-dot 2s infinite; }
@keyframes pulse-dot { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(.8)} }

.hero h1 {
  font-size: clamp(34px, 6vw, 62px);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.08;
  margin-bottom: 20px;
}
.hero h1 .highlight {
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: 17px;
  color: var(--c-muted);
  max-width: 540px;
  margin: 0 auto 36px;
  line-height: 1.7;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* =====================
   Section Titles
   ===================== */
.section-header { margin-bottom: 32px; }
.section-header h2 { font-size: clamp(22px, 4vw, 30px); letter-spacing: -.5px; }
.section-header p { color: var(--c-muted); margin-top: 8px; font-size: 15px; }
.section-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--c-primary);
  margin-bottom: 10px;
}

/* =====================
   Course Cards
   ===================== */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 24px;
}
.course-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--t-med) var(--ease), border-color var(--t-fast), box-shadow var(--t-med);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}
.course-card:hover {
  transform: translateY(-6px);
  border-color: rgba(91,106,245,.35);
  box-shadow: 0 20px 44px rgba(0,0,0,.5), 0 0 0 1px rgba(91,106,245,.15);
}
.course-thumb {
  height: 170px;
  position: relative;
  overflow: hidden;
  display: flex; align-items: center; justify-content: center;
  font-size: 48px;
}
.course-thumb::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 50px;
  background: linear-gradient(to bottom, rgba(13, 15, 20, 0.4) 0%, rgba(13, 15, 20, 0) 100%);
  pointer-events: none;
  z-index: 1;
}
.course-thumb::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 60px;
  background: linear-gradient(to top, rgba(13, 15, 20, 0.7) 0%, rgba(13, 15, 20, 0) 100%);
  pointer-events: none;
  z-index: 1;
}
/* Premium Course Card Badges */
.course-card-badge {
  position: absolute;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-md);
  padding: 4px 10px;
  font-size: 10px;
  font-weight: 750;
  letter-spacing: 0.5px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  z-index: 10;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.15);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  text-transform: uppercase;
}

/* Placements */
.badge-top-left { top: 12px; left: 12px; }
.badge-top-right { top: 12px; right: 12px; }
.badge-bottom-left { bottom: 12px; left: 12px; }
.badge-bottom-right { bottom: 12px; right: 12px; }

/* Colors */
.badge-cert {
  background: rgba(245, 158, 11, 0.12) !important;
  color: #fb923c !important;
  border: 1px solid rgba(245, 158, 11, 0.25) !important;
}
.badge-unlocked {
  background: rgba(16, 185, 129, 0.12) !important;
  color: #34d399 !important;
  border: 1px solid rgba(16, 185, 129, 0.25) !important;
}
.badge-draft {
  background: rgba(244, 63, 94, 0.12) !important;
  color: #fb7185 !important;
  border: 1px solid rgba(244, 63, 94, 0.25) !important;
}
.badge-val-free {
  background: rgba(16, 185, 129, 0.12) !important;
  color: #34d399 !important;
  border: 1px solid rgba(16, 185, 129, 0.25) !important;
}
.badge-val-paid {
  background: rgba(99, 102, 241, 0.12) !important;
  color: #a5b4fc !important;
  border: 1px solid rgba(99, 102, 241, 0.25) !important;
}

/* Colourful gradient per course (nth-child based) */
.course-card:nth-child(3n+1) .course-thumb { background: linear-gradient(135deg, #1e1b4b 0%, #312e81 50%, #4c1d95 100%); }
.course-card:nth-child(3n+2) .course-thumb { background: linear-gradient(135deg, #0f172a 0%, #134e4a 50%, #0d3d56 100%); }
.course-card:nth-child(3n)   .course-thumb { background: linear-gradient(135deg, #1c0533 0%, #4a044e 50%, #831843 100%); }

.course-thumb-dots {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 22px 22px;
}

.course-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.course-title { font-size: 16px; font-weight: 700; margin-bottom: 8px; line-height: 1.35; letter-spacing: -.2px; }
.course-desc { font-size: 13px; color: var(--c-muted); flex: 1; margin-bottom: 18px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; line-height: 1.6; }
.course-footer { display: flex; justify-content: space-between; align-items: center; padding-top: 14px; border-top: 1px solid var(--c-border); }
.course-teacher { font-size: 12px; color: var(--c-muted); display: flex; align-items: center; gap: 6px; }
.course-teacher-avatar { width: 22px; height: 22px; border-radius: 50%; background: var(--grad-primary); display: flex; align-items: center; justify-content: center; font-size: 10px; font-weight: 700; color: #fff; flex-shrink: 0; }

/* =====================
   Auth Pages (Login / Register)
   ===================== */
.auth-wrap {
  min-height: calc(100vh - 130px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
}
.auth-box {
  width: 100%;
  max-width: 480px;
  background: var(--c-surface);
  border: 1px solid var(--c-border2);
  border-radius: var(--radius-xl);
  padding: 40px 36px;
  box-shadow: var(--shadow-lg);
}
.auth-logo { display: flex; align-items: center; gap: 10px; margin-bottom: 28px; }
.auth-title { font-size: 24px; font-weight: 800; margin-bottom: 6px; letter-spacing: -.5px; }
.auth-sub { font-size: 14px; color: var(--c-muted); margin-bottom: 28px; }
.auth-divider { display: flex; align-items: center; gap: 14px; margin: 22px 0; color: var(--c-muted); font-size: 12px; }
.auth-divider::before, .auth-divider::after { content: ''; flex: 1; height: 1px; background: var(--c-border); }
.auth-link { text-align: center; font-size: 13px; color: var(--c-muted); margin-top: 20px; }
.auth-link a { color: var(--c-primary); font-weight: 600; }

/* =====================
   Waiting spinner
   ===================== */
.spinner-wrap { text-align: center; padding: 28px 0; }
.spinner {
  width: 44px; height: 44px;
  border: 3px solid var(--c-border2);
  border-top-color: var(--c-primary);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  margin: 0 auto 16px;
}
@keyframes spin { to { transform: rotate(360deg); } }
.progress-ring-text { font-size: 13px; color: var(--c-muted); }
#countdown-num { font-weight: 700; color: var(--c-primary); }

/* =====================
   Course Viewer (Lesson)
   ===================== */
.viewer-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 24px;
  align-items: start;
}
.lesson-sidebar {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  position: sticky;
  top: 84px;
}
.lesson-sidebar-head {
  padding: 18px 20px;
  border-bottom: 1px solid var(--c-border);
  font-weight: 700;
  font-size: 14px;
  line-height: 1.4;
}
.lesson-list { list-style: none; }
.lesson-item { border-bottom: 1px solid var(--c-border); }
.lesson-item:last-child { border: none; }
.lesson-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 18px;
  font-size: 13px;
  color: var(--c-muted);
  transition: background var(--t-fast), color var(--t-fast);
  line-height: 1.4;
}
.lesson-link:hover { background: rgba(255,255,255,.03); color: var(--c-text); }
.lesson-link.active { background: rgba(91,106,245,.1); color: var(--c-primary); border-left: 3px solid var(--c-primary); font-weight: 600; }
.lesson-link.locked { opacity: .45; cursor: not-allowed; }
.lesson-link.locked:hover { background: none; color: var(--c-muted); }

.lesson-content-panel {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 36px;
}
.lesson-body { font-size: 15px; line-height: 1.85; color: #bcc2d9; margin-bottom: 28px; }
.lesson-body p { margin-bottom: 14px; }

.lesson-media { border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--c-border); margin: 20px 0; }
.lesson-media video, .lesson-media audio { width: 100%; display: block; background: #000; }

.lesson-attach {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--c-bg2);
  border: 1px dashed var(--c-border2);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  margin-top: 20px;
  gap: 14px;
  flex-wrap: wrap;
}
.lesson-nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 22px;
  margin-top: 22px;
  border-top: 1px solid var(--c-border);
  gap: 12px;
  flex-wrap: wrap;
}

/* =====================
   Stats / Admin Dashboard
   ===================== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 18px; margin-bottom: 32px; }
.stat-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 22px 24px;
  display: flex; flex-direction: column; gap: 6px;
}
.stat-label { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .8px; color: var(--c-muted); }
.stat-val { font-size: 36px; font-weight: 800; font-family: var(--font-display); background: var(--grad-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; line-height: 1; }

/* =====================
   Table
   ===================== */
.table-wrap { overflow-x: auto; border-radius: var(--radius-md); border: 1px solid var(--c-border); }
table { width: 100%; border-collapse: collapse; text-align: left; }
th { padding: 13px 18px; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .8px; color: var(--c-muted); background: var(--c-surface2); border-bottom: 1px solid var(--c-border); }
td { padding: 14px 18px; font-size: 14px; border-bottom: 1px solid var(--c-border); }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: rgba(255,255,255,.02); }

/* Progress bar */
.prog-bar { display: inline-flex; align-items: center; gap: 10px; }
.prog-track { width: 90px; height: 6px; background: var(--c-surface2); border-radius: 10px; overflow: hidden; }
.prog-fill { height: 100%; background: var(--grad-primary); border-radius: 10px; }

/* =====================
   QR Code
   ===================== */
.qr-wrapper { background: #fff; display: inline-block; padding: 12px; border-radius: var(--radius-md); margin: 16px 0; }

/* =====================
   Home — General spacing
   ===================== */
.home-section { margin-top: 60px; }

/* =====================
   Stats Band
   ===================== */
.stats-band {
  margin-top: 20px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-xl);
  padding: 28px 36px;
}
.stats-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 20px;
}
.stat-pill {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  min-width: 110px;
}
.stat-pill-val {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 800;
  background: var(--grad-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1;
}
.stat-pill-label {
  font-size: 12px;
  color: var(--c-muted);
  font-weight: 500;
  text-align: center;
}
.stat-pill-sep {
  width: 1px;
  height: 36px;
  background: var(--c-border);
  flex-shrink: 0;
}
@media (max-width: 600px) {
  .stat-pill-sep { display: none; }
  .stats-band { padding: 20px; }
}

/* =====================
   How it works
   ===================== */
.how-grid {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: center;
}
.how-card {
  flex: 1;
  min-width: 220px;
  max-width: 300px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition: border-color var(--t-fast), transform var(--t-med);
  position: relative;
}
.how-card:hover {
  border-color: rgba(91,106,245,.35);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.how-num {
  position: absolute;
  top: 16px; left: 18px;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--c-muted);
}
.how-icon {
  font-size: 36px;
  margin: 12px 0 14px;
}
.how-card h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -.2px;
}
.how-card p {
  font-size: 13px;
  color: var(--c-muted);
  line-height: 1.65;
}
.how-arrow {
  font-size: 24px;
  color: var(--c-border2);
  flex-shrink: 0;
}
@media (max-width: 700px) { .how-arrow { display: none; } }

/* =====================
   Features Section
   ===================== */
.features-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
@media (max-width: 860px) {
  .features-section { grid-template-columns: 1fr; gap: 36px; }
}
.feature-list {
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.feature-ico {
  font-size: 22px;
  flex-shrink: 0;
  margin-top: 2px;
  width: 40px; height: 40px;
  background: var(--c-surface2);
  border: 1px solid var(--c-border);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
}
.feature-item strong { display: block; font-size: 14px; font-weight: 700; margin-bottom: 3px; }
.feature-item p { font-size: 13px; color: var(--c-muted); line-height: 1.6; margin: 0; }

/* Mockup */
.feat-mockup {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(91,106,245,.08);
}
.feat-mockup-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  background: var(--c-surface2);
  border-bottom: 1px solid var(--c-border);
}
.feat-mockup-bar span {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--c-border2);
  flex-shrink: 0;
}
.feat-mockup-bar span:nth-child(1) { background: #ff5f57; }
.feat-mockup-bar span:nth-child(2) { background: #febc2e; }
.feat-mockup-bar span:nth-child(3) { background: #28c840; }
.feat-mockup-body { padding: 22px; }

/* =====================
   Testimonials
   ===================== */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 22px;
  text-align: left;
}
.testimonial-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 26px;
  transition: border-color var(--t-fast), transform var(--t-med);
}
.testimonial-card:hover {
  border-color: rgba(91,106,245,.25);
  transform: translateY(-4px);
}
.testimonial-featured {
  border-color: rgba(91,106,245,.3);
  background: linear-gradient(160deg, var(--c-surface) 0%, rgba(91,106,245,.06) 100%);
  box-shadow: 0 8px 28px rgba(91,106,245,.12);
}
.testimonial-stars { color: #fbbf24; font-size: 14px; margin-bottom: 12px; letter-spacing: 2px; }
.testimonial-card p { font-size: 14px; color: #bcc2d9; line-height: 1.75; margin-bottom: 20px; font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px; font-weight: 700; color: #fff;
  flex-shrink: 0;
}
.testimonial-author strong { display: block; font-size: 14px; }
.testimonial-author span { font-size: 12px; color: var(--c-muted); }

/* =====================
   CTA Section
   ===================== */
.cta-section {
  margin-top: 72px;
  border-radius: var(--radius-xl);
  background: var(--c-surface);
  border: 1px solid rgba(91,106,245,.25);
  overflow: hidden;
  position: relative;
}
.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 80% at 50% 100%, rgba(91,106,245,.15) 0%, transparent 70%);
  pointer-events: none;
}
.cta-inner {
  position: relative;
  text-align: center;
  padding: 60px 32px;
}
.cta-inner h2 { font-size: clamp(22px, 4vw, 34px); margin-bottom: 12px; }
.cta-inner p { color: var(--c-muted); font-size: 16px; margin-bottom: 32px; }

/* =====================
   Footer
   ===================== */
.site-footer {
  background: var(--c-bg2);
  border-top: 1px solid var(--c-border);
  margin-top: 80px;
}

.footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding: 48px 0 40px;
}
@media (max-width: 900px) {
  .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; padding: 36px 0 28px; }
}
@media (max-width: 560px) {
  .footer-top { grid-template-columns: 1fr; }
}

.footer-logo { margin-bottom: 14px; display: inline-flex; }
.footer-tagline {
  font-size: 13px;
  color: var(--c-muted);
  line-height: 1.75;
  margin-bottom: 18px;
  max-width: 260px;
}
.footer-socials { display: flex; gap: 8px; }
.social-btn {
  width: 34px; height: 34px;
  background: var(--c-surface);
  border: 1px solid var(--c-border2);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: var(--c-muted);
  transition: border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
}
.social-btn:hover { border-color: var(--c-primary); color: var(--c-primary); background: rgba(91,106,245,.08); }

.footer-col-title {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--c-text);
  margin-bottom: 16px;
}
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 13px; color: var(--c-muted); transition: color var(--t-fast); }
.footer-links a:hover { color: var(--c-text); }

.footer-payment-desc {
  font-size: 12px;
  color: var(--c-muted);
  line-height: 1.65;
  margin-bottom: 14px;
}

.payment-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}
.pay-badge {
  display: flex;
  align-items: center;
  gap: 4px;
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  padding: 6px 12px;
  height: 34px;
}
.pay-badge-mc { padding: 6px 10px; }

.footer-secure-note {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 11px;
  color: var(--c-success);
  font-weight: 500;
  background: rgba(34,197,94,.07);
  border: 1px solid rgba(34,197,94,.15);
  border-radius: 8px;
  padding: 8px 12px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding: 18px 0;
  border-top: 1px solid var(--c-border);
  font-size: 13px;
  color: var(--c-muted);
}
.footer-bottom a { color: var(--c-primary); font-weight: 500; }
.footer-bottom a:hover { color: var(--c-primary2); }
@media (max-width: 560px) { .footer-bottom { text-align: center; justify-content: center; } }

/* =====================
   Chips / Tags
   ===================== */
.chip {
  display: inline-flex; align-items: center; gap: 5px;
  padding: 3px 10px;
  border-radius: 30px;
  font-size: 12px;
  font-weight: 600;
}
.chip-success { background: rgba(34,197,94,.12); color: var(--c-success); }
.chip-danger  { background: rgba(244,63,94,.12);  color: var(--c-danger); }
.chip-muted   { background: var(--c-surface2); color: var(--c-muted); }
.chip-primary { background: rgba(91,106,245,.15); color: #818cf8; }

/* =====================
   Responsive
   ===================== */
@media (max-width: 900px) {
  .viewer-layout { grid-template-columns: 1fr; }
  .lesson-sidebar { position: static; }
}
@media (max-width: 768px) {
  .nav-center { display: none; }
  .nav-right .nav-link,
  .nav-right .btn:not(.btn-sm),
  .nav-right .nav-avatar { display: none; }
  .nav-right .btn.btn-sm { display: none; }
  .nav-right .lang-switcher { display: none; }
  .hamburger { display: flex; }
  .auth-box { padding: 28px 20px; }
}