:root {
  --bg: #121016;
  --bg-alt: #17141d;
  --card: #1c1922;
  --card-border: #2a2632;
  --text: #f2f0f5;
  --muted: #a19cae;
  --accent: #6c5ce7;
  --accent-dark: #5646c0;
  --accent-text: #ffffff;
  --danger: #ef5350;
  --danger-bg: #3a1e1e;
  --success: #66bb6a;
  --success-bg: #1b3320;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: 'Poppins', -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; background: var(--bg); color: var(--text); }
a { color: var(--accent); }
.topbar { display: flex; justify-content: space-between; align-items: center; background: var(--bg-alt); box-shadow: 0 2px 10px rgba(0,0,0,0.3); color: var(--text); padding: 14px 24px; }
.topbar a { color: var(--text); text-decoration: none; margin-left: 18px; }
.topbar a:hover { color: var(--accent); }
.brand { font-weight: 700; font-size: 1.1rem; margin-left: 0 !important; color: var(--accent) !important; }
.preview-banner {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px;
  background: var(--accent); color: var(--accent-text); padding: 10px 24px; font-weight: 600;
}
.container { max-width: 900px; margin: 0 auto; padding: 24px; }
.hero { text-align: center; padding: 40px 0; }
.card-row { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; margin-top: 24px; }
.card { background: var(--card); border-radius: 16px; padding: 20px; box-shadow: 0 4px 18px rgba(0,0,0,0.35); text-decoration: none; color: var(--text); display: block; }
.class-card:hover, .card:hover { box-shadow: 0 6px 24px rgba(0,0,0,0.45); }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; margin-top: 12px; }
.btn { display: inline-block; padding: 10px 18px; border-radius: 10px; border: none; color: var(--text); background: var(--card); box-shadow: 0 2px 8px rgba(0,0,0,0.3); text-decoration: none; cursor: pointer; font-size: 0.95rem; font-family: inherit; }
.btn:hover { color: var(--accent); box-shadow: 0 3px 12px rgba(0,0,0,0.4); }
.btn-primary { background: var(--accent); border: none; color: var(--accent-text); font-weight: 600; }
.btn-primary:hover { background: var(--accent-dark); color: var(--accent-text); }
.btn-secondary { background: transparent; border: none; color: var(--accent); }
.btn-danger { background: var(--danger); border: none; color: #2a0d0d; font-weight: 600; }
.btn-row { display: flex; gap: 10px; margin-top: 10px; }
form.stacked-form, .form-page form { display: flex; flex-direction: column; gap: 14px; max-width: 480px; }
.form-page { max-width: 480px; margin: 0 auto; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
label { display: flex; flex-direction: column; gap: 4px; font-weight: 600; font-size: 0.9rem; color: var(--text); }
input, textarea, select {
  padding: 8px 12px; border-radius: 10px; border: none;
  font-size: 1rem; font-family: inherit; background: var(--bg-alt); color: var(--text);
  box-shadow: inset 0 1px 4px rgba(0,0,0,0.3);
}
input:focus, textarea:focus, select:focus { outline: none; box-shadow: inset 0 1px 4px rgba(0,0,0,0.3), 0 0 0 2px var(--accent); }
.inline-form { display: flex; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; }
.radio-label, .checkbox-label { font-weight: 400; flex-direction: row; align-items: center; gap: 8px; }
.flash { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; }
.flash-error { background: var(--danger-bg); color: #ff8a80; }
.flash-success { background: var(--success-bg); color: #a5d6a7; }
.badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; }
.badge-open { background: var(--success-bg); color: #a5d6a7; }
.badge-upcoming { background: #251c4a; color: var(--accent); }
.badge-closed { background: #2a2632; color: var(--muted); }
.table { width: 100%; border-collapse: collapse; margin-top: 10px; }
.table th, .table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--card-border); }
.table-scroll { width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; }
.muted { color: var(--muted); }
.transcript-box { background: var(--card); border-radius: 14px; padding: 14px; white-space: pre-wrap; box-shadow: 0 4px 14px rgba(0,0,0,0.3); }
.alert { padding: 14px; border-radius: 14px; margin: 16px 0; box-shadow: 0 4px 14px rgba(0,0,0,0.25); }
.alert-warning { background: #251c4a; color: var(--accent); }
.timer { font-size: 2.5rem; font-weight: 700; text-align: center; color: var(--accent); }
.prompt-text { background: var(--card); padding: 16px; border-radius: 14px; box-shadow: 0 4px 14px rgba(0,0,0,0.3); }
.prompt-reminder { font-weight: 600; text-align: center; }
.code { font-family: monospace; font-size: 1.1rem; color: var(--accent); }
.rubric-row { background: var(--card); border-radius: 14px; padding: 12px 16px; margin-bottom: 10px; box-shadow: 0 4px 14px rgba(0,0,0,0.3); }
.rubric-row label { display: inline-flex; flex-direction: row; align-items: center; gap: 6px; font-weight: 400; margin-bottom: 6px; }
.rubric-row textarea { width: 100%; margin-top: 4px; }

/* Mobile */
@media (max-width: 640px) {
  .container { padding: 16px; }
  .topbar { flex-wrap: wrap; gap: 8px; padding: 12px 16px; }
  .topbar nav { display: flex; flex-wrap: wrap; gap: 4px 14px; }
  .topbar a { margin-left: 0; }
  .two-col { grid-template-columns: 1fr; }
  .card-row { flex-direction: column; }
  .grid { grid-template-columns: 1fr; }
  .hero { padding: 24px 0; }
  .btn { padding: 12px 18px; width: 100%; text-align: center; }
  .btn-row { flex-direction: column; }
  .btn-row .btn { width: 100%; }
  .inline-form { flex-direction: column; align-items: stretch; }
  .inline-form input, .inline-form select, .inline-form textarea { width: 100%; }
  form.stacked-form, .form-page form { max-width: 100%; }
  .timer { font-size: 2rem; }
  video { width: 100% !important; max-width: 100% !important; }
}