/* ============================================================
   LMS MAIN STYLESHEET
   Font: Sora (UI) + JetBrains Mono (code/IDs)
   Theme: Deep navy + electric teal accent, clean SaaS
   ============================================================ */

:root {
  --bg-base:    #0d1117;
  --bg-surface: #161b22;
  --bg-card:    #1c2330;
  --bg-hover:   #21262d;
  --border:     #30363d;
  --border-light: #3d444d;

  --accent:     #00d4aa;
  --accent-dim: #00a884;
  --accent-glow: rgba(0,212,170,.15);

  --text-primary:   #e6edf3;
  --text-secondary: #8b949e;
  --text-muted:     #484f58;

  --success: #3fb950;
  --warning: #d29922;
  --danger:  #f85149;
  --info:    #388bfd;

  --sidebar-w: 260px;
  --topbar-h:  60px;
  --radius:    10px;
  --radius-sm: 6px;
  --shadow:    0 4px 24px rgba(0,0,0,.4);

  --font: 'Sora', sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

/* RESET */
*,*::before,*::after { box-sizing:border-box; margin:0; padding:0; }
html { scroll-behavior:smooth; }
body {
  font-family: var(--font);
  background: var(--bg-base);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration:none; }
a:hover { color: var(--accent-dim); }
img { max-width:100%; display:block; }
button, input, select, textarea { font-family: var(--font); }

/* ============================================================
   LAYOUT
   ============================================================ */
.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sidebar-w);
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 200;
  transition: transform .25s ease;
}

.main-wrapper {
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page-content {
  padding: 24px;
  flex: 1;
}

/* ============================================================
   SIDEBAR BRAND
   ============================================================ */
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--border);
}
.brand-icon {
  width: 38px; height: 38px;
  background: linear-gradient(135deg, var(--accent), #0099ff);
  border-radius: var(--radius-sm);
  display: flex; align-items:center; justify-content:center;
  font-size: 18px; color: #fff;
  flex-shrink: 0;
}
.brand-name {
  font-size: 15px; font-weight: 700;
  color: var(--text-primary);
  flex: 1;
}
.sidebar-close { display:none; background:none; border:none; color:var(--text-secondary); cursor:pointer; font-size:18px; }

/* ============================================================
   SIDEBAR USER
   ============================================================ */
.sidebar-user {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border);
}
.user-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  display: flex; align-items:center; justify-content:center;
  font-size: 13px; font-weight: 700; color:#fff;
  flex-shrink: 0;
}
.user-info { display:flex; flex-direction:column; gap:2px; overflow:hidden; }
.user-name { font-size:13px; font-weight:600; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.user-role {
  font-size:10px; font-weight:700; letter-spacing:.8px; text-transform:uppercase;
  padding:2px 8px; border-radius:20px;
}
.badge-role-admin   { background: rgba(248,81,73,.2); color:#f85149; }
.badge-role-trainer { background: rgba(210,153,34,.2); color:#d29922; }
.badge-role-candidate { background: rgba(0,212,170,.2); color:#00d4aa; }

/* ============================================================
   SIDEBAR NAV
   ============================================================ */
.sidebar-nav {
  flex: 1;
  padding: 12px 0;
  overflow-y: auto;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px;
  color: var(--text-secondary);
  font-size: 13.5px;
  font-weight: 500;
  border-left: 3px solid transparent;
  transition: all .15s ease;
}
.nav-item:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}
.nav-item.active {
  color: var(--accent);
  background: var(--accent-glow);
  border-left-color: var(--accent);
}
.nav-item i { width:18px; text-align:center; font-size:15px; flex-shrink:0; }
.nav-divider { height:1px; background:var(--border); margin:8px 16px; }
.nav-logout:hover { color: var(--danger); background: rgba(248,81,73,.08); }

/* ============================================================
   TOPBAR
   ============================================================ */
.topbar {
  height: var(--topbar-h);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 24px;
  position: sticky; top:0; z-index:100;
}
.menu-toggle {
  display: none;
  background:none; border:none;
  color: var(--text-secondary);
  font-size: 20px; cursor:pointer;
}
.topbar-title { font-size:16px; font-weight:700; flex:1; }
.topbar-right { display:flex; align-items:center; gap:12px; }
.topbar-avatar {
  width:34px; height:34px;
  border-radius:50%;
  background: linear-gradient(135deg, #6366f1,#8b5cf6);
  display:flex; align-items:center; justify-content:center;
  font-size:12px; font-weight:700; color:#fff;
}

/* ============================================================
   FLASH MESSAGES
   ============================================================ */
.flash-msg {
  display:flex; align-items:center; gap:10px;
  padding:12px 20px;
  margin:0 24px 0 24px;
  margin-top:16px;
  border-radius:var(--radius-sm);
  font-size:13.5px; font-weight:500;
  position:relative;
}
.flash-success { background:rgba(63,185,80,.15); border:1px solid rgba(63,185,80,.4); color:#3fb950; }
.flash-error   { background:rgba(248,81,73,.15);  border:1px solid rgba(248,81,73,.4);  color:#f85149; }
.flash-info    { background:rgba(56,139,253,.15); border:1px solid rgba(56,139,253,.4); color:#388bfd; }
.flash-close { margin-left:auto; background:none; border:none; cursor:pointer; font-size:18px; color:inherit; opacity:.7; }
.flash-close:hover { opacity:1; }

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.card-header {
  display:flex; align-items:center; justify-content:space-between;
  margin-bottom:16px; padding-bottom:12px;
  border-bottom:1px solid var(--border);
}
.card-title { font-size:15px; font-weight:700; }

/* ============================================================
   STAT CARDS
   ============================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px,1fr));
  gap: 16px;
  margin-bottom: 24px;
}
.stat-card {
  background: var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:20px;
  display:flex; align-items:center; gap:16px;
  transition: border-color .2s, transform .2s;
}
.stat-card:hover { border-color:var(--border-light); transform:translateY(-2px); }
.stat-icon {
  width:48px; height:48px;
  border-radius:var(--radius-sm);
  display:flex; align-items:center; justify-content:center;
  font-size:20px;
}
.stat-icon.green  { background:rgba(63,185,80,.15);  color:#3fb950; }
.stat-icon.blue   { background:rgba(56,139,253,.15); color:#388bfd; }
.stat-icon.teal   { background:rgba(0,212,170,.15);  color:#00d4aa; }
.stat-icon.orange { background:rgba(210,153,34,.15); color:#d29922; }
.stat-icon.red    { background:rgba(248,81,73,.15);  color:#f85149; }
.stat-icon.purple { background:rgba(139,92,246,.15); color:#8b5cf6; }
.stat-info { flex:1; }
.stat-value { font-size:28px; font-weight:700; line-height:1; }
.stat-label { font-size:12px; color:var(--text-secondary); margin-top:4px; text-transform:uppercase; letter-spacing:.6px; }

/* ============================================================
   TABLES
   ============================================================ */
.table-wrap { overflow-x:auto; }
table { width:100%; border-collapse:collapse; }
th { text-align:left; padding:10px 14px; font-size:11px; font-weight:700;
     text-transform:uppercase; letter-spacing:.8px; color:var(--text-secondary);
     border-bottom:1px solid var(--border); }
td { padding:12px 14px; border-bottom:1px solid var(--border); font-size:13.5px;
     vertical-align:middle; }
tr:last-child td { border-bottom:none; }
tbody tr:hover td { background:var(--bg-hover); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:9px 18px;
  border-radius:var(--radius-sm);
  font-size:13.5px; font-weight:600;
  cursor:pointer; border:none;
  transition: all .15s ease;
  white-space:nowrap;
}
.btn-primary   { background:var(--accent);    color:#000; }
.btn-primary:hover { background:var(--accent-dim); color:#000; }
.btn-secondary { background:var(--bg-hover);  color:var(--text-primary); border:1px solid var(--border); }
.btn-secondary:hover { border-color:var(--border-light); }
.btn-danger    { background:rgba(248,81,73,.15); color:#f85149; border:1px solid rgba(248,81,73,.3); }
.btn-danger:hover { background:rgba(248,81,73,.25); }
.btn-success   { background:rgba(63,185,80,.15); color:#3fb950; border:1px solid rgba(63,185,80,.3); }
.btn-sm { padding:5px 12px; font-size:12px; }
.btn-xs { padding:3px 8px; font-size:11px; }

/* ============================================================
   FORMS
   ============================================================ */
.form-group { margin-bottom:18px; }
.form-label {
  display:block; font-size:13px; font-weight:600;
  color:var(--text-secondary); margin-bottom:6px;
}
.form-control {
  width:100%;
  background:var(--bg-hover);
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  color:var(--text-primary);
  padding:10px 14px;
  font-size:14px;
  outline:none;
  transition: border-color .15s;
}
.form-control:focus { border-color:var(--accent); box-shadow:0 0 0 3px var(--accent-glow); }
select.form-control { cursor:pointer; }
textarea.form-control { resize:vertical; min-height:100px; }
.form-hint { font-size:11.5px; color:var(--text-muted); margin-top:4px; }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:16px; }

/* ============================================================
   BADGES
   ============================================================ */
.badge {
  display:inline-flex; align-items:center;
  padding:3px 10px; border-radius:20px;
  font-size:11px; font-weight:700; letter-spacing:.5px;
}
.badge-success { background:rgba(63,185,80,.2);  color:#3fb950; }
.badge-danger  { background:rgba(248,81,73,.2);  color:#f85149; }
.badge-warning { background:rgba(210,153,34,.2); color:#d29922; }
.badge-info    { background:rgba(56,139,253,.2); color:#388bfd; }
.badge-teal    { background:rgba(0,212,170,.2);  color:#00d4aa; }

/* ============================================================
   PROGRESS BAR
   ============================================================ */
.progress-wrap { background:var(--bg-hover); border-radius:20px; height:8px; overflow:hidden; }
.progress-bar  { height:100%; border-radius:20px; background:linear-gradient(90deg,var(--accent),#0099ff); transition:width .4s ease; }

/* ============================================================
   AUTH PAGES
   ============================================================ */
.auth-page {
  min-height:100vh;
  display:flex;
  background: var(--bg-base);
}
.auth-left {
  flex:1;
  background: linear-gradient(135deg, #0d1117 0%, #0f2a3a 50%, #0d1117 100%);
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  padding:60px;
  position:relative; overflow:hidden;
}
.auth-left::before {
  content:'';
  position:absolute; inset:0;
  background: radial-gradient(ellipse 60% 60% at 50% 50%, rgba(0,212,170,.08), transparent);
}
.auth-art { position:relative; text-align:center; }
.auth-art-icon { font-size:80px; color:var(--accent); margin-bottom:24px; }
.auth-art h2 { font-size:32px; font-weight:700; margin-bottom:12px; }
.auth-art p  { color:var(--text-secondary); font-size:16px; max-width:360px; }
.auth-right {
  width:480px;
  display:flex; align-items:center; justify-content:center;
  padding:40px;
  background:var(--bg-surface);
  border-left:1px solid var(--border);
}
.auth-box { width:100%; max-width:380px; }
.auth-logo { display:flex; align-items:center; gap:12px; margin-bottom:32px; }
.auth-logo .brand-icon { width:44px; height:44px; font-size:22px; }
.auth-logo span { font-size:20px; font-weight:800; }
.auth-title { font-size:24px; font-weight:800; margin-bottom:6px; }
.auth-sub   { color:var(--text-secondary); font-size:14px; margin-bottom:28px; }

/* ============================================================
   COURSE VIEWER
   ============================================================ */
.slide-viewer {
  background: var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  overflow:hidden;
}
.slide-frame {
  width:100%;
  aspect-ratio:16/9;
  background:#000;
  display:flex; align-items:center; justify-content:center;
  position:relative;
}
.slide-frame img {
  max-width:100%; max-height:100%;
  object-fit:contain;
  user-select:none;
  -webkit-user-drag:none;
  pointer-events:none;
}
.slide-controls {
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 20px;
  border-top:1px solid var(--border);
  background:var(--bg-surface);
}
.slide-counter { font-size:13px; color:var(--text-secondary); font-family:var(--mono); }

/* ============================================================
   EXAM
   ============================================================ */
.exam-question {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:20px;
  margin-bottom:16px;
}
.q-number { font-size:11px; color:var(--text-muted); font-family:var(--mono); text-transform:uppercase; margin-bottom:6px; }
.q-text   { font-size:15px; font-weight:600; margin-bottom:14px; line-height:1.5; }
.option-label {
  display:flex; align-items:center; gap:12px;
  padding:10px 14px;
  border:1px solid var(--border);
  border-radius:var(--radius-sm);
  cursor:pointer;
  margin-bottom:8px;
  transition: all .15s;
}
.option-label:hover { border-color:var(--border-light); background:var(--bg-hover); }
.option-label input[type=radio] { accent-color:var(--accent); width:16px; height:16px; flex-shrink:0; }
.option-label input[type=radio]:checked ~ * { color:var(--accent); }
.option-label:has(input:checked) { border-color:var(--accent); background:var(--accent-glow); }

/* ============================================================
   TIMER
   ============================================================ */
.exam-timer {
  font-family:var(--mono);
  font-size:24px; font-weight:700;
  color:var(--accent);
  background:var(--bg-card);
  border:2px solid var(--border);
  border-radius:var(--radius);
  padding:12px 24px;
  text-align:center;
  min-width:120px;
}
.exam-timer.warning { color:var(--danger); border-color:var(--danger); animation:pulse 1s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.6} }

/* ============================================================
   CERTIFICATE PREVIEW
   ============================================================ */
.cert-preview {
  background: linear-gradient(135deg,#0d1f2d,#0f2a1a);
  border:2px solid var(--accent);
  border-radius:12px;
  padding:48px;
  text-align:center;
  position:relative;
  max-width:700px;
  margin:0 auto;
}
.cert-preview::before {
  content:'';
  position:absolute; inset:8px;
  border:1px solid rgba(0,212,170,.3);
  border-radius:8px; pointer-events:none;
}
.cert-org   { font-size:13px; letter-spacing:3px; text-transform:uppercase; color:var(--accent); margin-bottom:24px; }
.cert-title { font-size:36px; font-weight:800; margin-bottom:8px; }
.cert-sub   { font-size:14px; color:var(--text-secondary); margin-bottom:32px; }
.cert-name  { font-size:32px; font-weight:800; color:var(--accent); margin-bottom:8px; }
.cert-course{ font-size:16px; color:var(--text-secondary); margin-bottom:32px; }
.cert-score { font-size:20px; font-weight:700; margin-bottom:8px; }
.cert-date  { font-size:13px; color:var(--text-secondary); margin-bottom:24px; }
.cert-uid   { font-family:var(--mono); font-size:11px; color:var(--text-muted); }
.cert-seal  { width:80px; height:80px; margin:0 auto 24px;
  border-radius:50%; border:3px solid var(--accent);
  display:flex; align-items:center; justify-content:center;
  font-size:32px; color:var(--accent); }

/* ============================================================
   LIVE SESSION CARDS
   ============================================================ */
.live-card {
  background:var(--bg-card);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:20px;
  transition: border-color .2s, transform .2s;
}
.live-card:hover { border-color:var(--border-light); transform:translateY(-2px); }
.live-badge {
  display:inline-flex; align-items:center; gap:6px;
  font-size:11px; font-weight:700; text-transform:uppercase;
  padding:4px 10px; border-radius:20px;
}
.live-badge.interactive { background:rgba(0,212,170,.15); color:var(--accent); }
.live-badge.meeting     { background:rgba(56,139,253,.15); color:#388bfd; }
.live-badge.youtube     { background:rgba(248,81,73,.15);  color:#f85149; }
.live-dot { width:6px; height:6px; border-radius:50%; background:currentColor; animation:pulse 1.5s infinite; }

/* ============================================================
   SIDEBAR OVERLAY (mobile)
   ============================================================ */
.sidebar-overlay {
  display:none;
  position:fixed; inset:0;
  background:rgba(0,0,0,.6);
  z-index:150;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .sidebar {
    transform:translateX(-100%);
  }
  .sidebar.open {
    transform:translateX(0);
    box-shadow:var(--shadow);
  }
  .sidebar-close { display:block; }
  .sidebar-overlay.open { display:block; }
  .main-wrapper { margin-left:0; }
  .menu-toggle { display:block; }
  .auth-left { display:none; }
  .auth-right { width:100%; }
  .form-row { grid-template-columns:1fr; }
  .stats-grid { grid-template-columns:1fr 1fr; }
  .page-content { padding:16px; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns:1fr; }
}

/* ============================================================
   UTILITY
   ============================================================ */
.text-muted    { color:var(--text-secondary); }
.text-success  { color:var(--success); }
.text-danger   { color:var(--danger); }
.text-accent   { color:var(--accent); }
.text-sm       { font-size:12px; }
.mt-1 { margin-top:8px; }  .mt-2 { margin-top:16px; }  .mt-3 { margin-top:24px; }
.mb-1 { margin-bottom:8px; }.mb-2 { margin-bottom:16px; }.mb-3 { margin-bottom:24px; }
.flex { display:flex; } .items-center { align-items:center; }
.justify-between { justify-content:space-between; }
.gap-2 { gap:8px; } .gap-3 { gap:12px; }
.d-grid { display:grid; gap:16px; }
.grid-2 { grid-template-columns:1fr 1fr; }
.grid-3 { grid-template-columns:repeat(3,1fr); }
.w-full { width:100%; }
.mono { font-family:var(--mono); }
.text-center { text-align:center; }
.separator { height:1px; background:var(--border); margin:20px 0; }
.empty-state {
  text-align:center; padding:60px 20px;
  color:var(--text-muted);
}
.empty-state i { font-size:48px; margin-bottom:12px; display:block; }
.empty-state p { font-size:14px; }

/* Page header */
.page-header {
  display:flex; align-items:center; justify-content:space-between;
  margin-bottom:24px;
  flex-wrap:wrap; gap:12px;
}
.page-header h1 { font-size:22px; font-weight:800; }
.page-header p  { font-size:13px; color:var(--text-secondary); margin-top:2px; }

/* Tabs */
.tabs { display:flex; gap:4px; border-bottom:1px solid var(--border); margin-bottom:20px; }
.tab-btn {
  padding:10px 18px; font-size:13.5px; font-weight:600;
  background:none; border:none; color:var(--text-secondary);
  cursor:pointer; border-bottom:2px solid transparent;
  transition:all .15s; margin-bottom:-1px;
}
.tab-btn.active { color:var(--accent); border-bottom-color:var(--accent); }
.tab-btn:hover:not(.active) { color:var(--text-primary); }
.tab-pane { display:none; }
.tab-pane.active { display:block; }

/* Modal */
.modal-overlay {
  display:none; position:fixed; inset:0;
  background:rgba(0,0,0,.7); z-index:400;
  align-items:center; justify-content:center;
}
.modal-overlay.open { display:flex; }
.modal {
  background:var(--bg-surface);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:28px;
  width:100%; max-width:520px;
  max-height:90vh; overflow-y:auto;
  box-shadow:var(--shadow);
}
.modal-header {
  display:flex; align-items:center; justify-content:space-between;
  margin-bottom:20px;
}
.modal-title { font-size:17px; font-weight:800; }
.modal-close { background:none; border:none; color:var(--text-secondary); cursor:pointer; font-size:20px; }

/* YouTube embed */
.yt-embed-wrap { position:relative; padding-bottom:56.25%; height:0; overflow:hidden; border-radius:var(--radius); }
.yt-embed-wrap iframe { position:absolute; inset:0; width:100%; height:100%; border:none; }