@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800;900&family=DM+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #080c14;
  --surface: #0d1220;
  --surface2: #111828;
  --border: #1a2540;
  --border-light: #243358;
  --accent: #3b82f6;
  --accent2: #93c5fd;
  --accent-glow: rgba(59,130,246,0.2);
  --green: #34d399;
  --red: #f87171;
  --yellow: #fbbf24;
  --text: #e2eaf8;
  --text-muted: #5a7aa8;
  --radius: 12px;
  --radius-sm: 8px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  background-image: radial-gradient(ellipse at 20% 20%, rgba(59,130,246,0.07) 0%, transparent 60%),
                    radial-gradient(ellipse at 80% 80%, rgba(147,197,253,0.04) 0%, transparent 60%);
}

/* Grain texture overlay */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 256px 256px;
}

/* Top accent line */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), var(--accent2), transparent);
  z-index: 200;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.container { animation: fadeUp 0.4s ease; max-width: 880px; margin: 0 auto; padding: 2rem 1.5rem; }

header {
  background: rgba(13,18,32,0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.75rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  position: sticky;
  top: 0;
  z-index: 100;
}
header a { text-decoration: none; color: var(--text); font-weight: 800; font-size: 1.15rem; letter-spacing: -0.02em; font-family: 'Outfit', sans-serif; }
header span { color: var(--accent); }

.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.75rem; margin-bottom: 1.25rem; transition: border-color 0.2s; }
.card:hover { border-color: var(--border-light); }
.card h2 { font-size: 0.78rem; font-weight: 700; margin-bottom: 1rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; }

.hero { text-align: center; padding: 5rem 2rem 3rem; }
.hero h1 { font-size: 3rem; font-weight: 900; margin-bottom: 1rem; letter-spacing: -0.04em; line-height: 1.1; font-family: 'Outfit', sans-serif; }
.hero h1 span { background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero > * { opacity: 0; animation: fadeUp 0.5s ease forwards; }
.hero > *:nth-child(1) { animation-delay: 0.05s; }
.hero > *:nth-child(2) { animation-delay: 0.15s; }
.hero > *:nth-child(3) { animation-delay: 0.25s; }
.hero > *:nth-child(4) { animation-delay: 0.35s; }
.hero > *:nth-child(5) { animation-delay: 0.45s; }
.hero p { color: var(--text-muted); font-size: 1.1rem; margin-bottom: 3rem; max-width: 480px; margin-left: auto; margin-right: auto; }

.action-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin-top: 2rem; }
.action-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 2rem 1.75rem; text-align: center; cursor: pointer;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  text-decoration: none; color: var(--text); display: block; position: relative; overflow: hidden;
}
.action-card::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, var(--accent-glow), transparent); opacity: 0; transition: opacity 0.3s; }
.action-card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: 0 8px 32px var(--accent-glow), inset 0 1px 0 rgba(255,255,255,0.05); background: radial-gradient(circle at 50% 0%, var(--accent-glow), transparent 70%), var(--surface); }
.action-card:hover::before { opacity: 1; }
.action-card .icon { font-size: 2.25rem; margin-bottom: 0.9rem; display: block; }
.action-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.4rem; font-family: 'Outfit', sans-serif; }
.action-card p { color: var(--text-muted); font-size: 0.875rem; line-height: 1.5; }

.form-group { margin-bottom: 1.25rem; }
label { display: block; font-size: 0.78rem; color: var(--text-muted); margin-bottom: 0.5rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.05em; }
input, select, textarea { width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); padding: 0.7rem 1rem; font-size: 0.95rem; font-family: 'DM Sans', sans-serif; transition: border-color 0.2s, box-shadow 0.2s; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), 0 0 0 4px var(--accent-glow); }
select option { background: var(--surface); }
textarea { resize: vertical; min-height: 120px; }
.num-row { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 1rem; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.7rem 1.6rem; border-radius: var(--radius-sm); border: none; font-size: 0.9rem; font-weight: 600; font-family: 'DM Sans', sans-serif; cursor: pointer; transition: all 0.2s; text-decoration: none; letter-spacing: -0.01em; }
.btn:active { transform: scale(0.97); }
.btn-primary { background: linear-gradient(135deg, var(--accent) 0%, var(--accent2) 100%); color: #080c14; font-weight: 700; box-shadow: 0 4px 16px var(--accent-glow); position: relative; overflow: hidden; }
.btn-primary::after { content: ''; position: absolute; inset: 0; background: rgba(255,255,255,0.2); transform: scaleX(0); transform-origin: center; transition: transform 0.3s ease; border-radius: inherit; }
.btn-primary:active::after { transform: scaleX(1); transition: transform 0.1s ease; }
.btn-primary:hover { box-shadow: 0 6px 24px var(--accent-glow); filter: brightness(1.1); }
.btn-outline { background: transparent; border: 1px solid var(--border-light); color: var(--text-muted); }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-glow); }
.btn-full { width: 100%; }

.question-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1.25rem; transition: border-color 0.2s; }
.question-card:focus-within { border-color: var(--border-light); }
.question-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.9rem; }
.question-num { font-size: 0.73rem; color: var(--text-muted); font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; }
.points-badge { font-size: 0.75rem; background: rgba(59,130,246,0.1); color: var(--accent2); padding: 0.2rem 0.65rem; border-radius: 20px; font-weight: 600; border: 1px solid rgba(59,130,246,0.2); }
.question-text { font-size: 1rem; line-height: 1.65; margin-bottom: 1rem; user-select: none; -webkit-user-select: none; }
.question-num, .points-badge, .options, .fill-blank-text { user-select: none; -webkit-user-select: none; }

/* Schema context box */
.schema-box { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.85rem 1rem; margin-bottom: 0.9rem; overflow-x: auto; }
.schema-box .label { font-size: 0.7rem; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.4rem; font-weight: 700; }
.schema-box pre { font-family: 'JetBrains Mono', monospace; font-size: 0.83rem; color: var(--accent2); line-height: 1.6; margin: 0; white-space: pre-wrap; word-wrap: break-word; }
.schema-box code { font-family: 'JetBrains Mono', monospace; font-size: 0.83rem; color: var(--accent2); line-height: 1.6; display: block; }

.hint-box { background: rgba(59,130,246,0.06); border-left: 3px solid var(--accent); padding: 0.6rem 0.9rem; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0.75rem; }

.options { display: flex; flex-direction: column; gap: 0.5rem; }
.option-label { display: flex; align-items: center; gap: 0.85rem; padding: 0.7rem 1rem; border-radius: var(--radius-sm); border: 1px solid var(--border); cursor: pointer; transition: all 0.15s; font-size: 0.925rem; }
.option-label:hover { border-color: var(--accent); background: rgba(59,130,246,0.06); }
.option-label input[type=radio] { accent-color: var(--accent); width: 16px; height: 16px; flex-shrink: 0; }
.option-label.selected { border-color: var(--accent); background: rgba(59,130,246,0.1); }

.fill-blank-text { font-size: 1rem; margin-bottom: 0.75rem; line-height: 1.8; }
.blank-input { display: inline-block; width: auto; min-width: 160px; padding: 0.3rem 0.75rem; }

/* SQL query textarea */
.sql-area { font-family: 'JetBrains Mono', 'Fira Code', monospace; font-size: 0.875rem; min-height: 140px; color: var(--accent2); background: #060910; border-color: var(--border); }
.sql-area:focus { border-color: var(--accent); }

.score-banner { background: linear-gradient(135deg, var(--surface) 0%, var(--surface2) 100%); border: 1px solid var(--border); border-radius: var(--radius); padding: 2.5rem 2rem; text-align: center; margin-bottom: 1.5rem; position: relative; overflow: hidden; }
.score-banner::before { content: ''; position: absolute; top: -50%; left: 50%; transform: translateX(-50%); width: 300px; height: 300px; background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%); pointer-events: none; }
.grade-letter { font-size: 5rem; font-weight: 900; line-height: 1; margin-bottom: 0.5rem; letter-spacing: -0.05em; font-family: 'Outfit', sans-serif; }
.grade-A { background: linear-gradient(135deg, #34d399, #059669); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.grade-B { background: linear-gradient(135deg, #60d394, #10b981); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.grade-C { background: linear-gradient(135deg, #fbbf24, #f59e0b); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.grade-D { background: linear-gradient(135deg, #fb923c, #ea580c); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.grade-F { background: linear-gradient(135deg, #f87171, #dc2626); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.score-text { font-size: 1.5rem; font-weight: 800; margin-bottom: 0.25rem; letter-spacing: -0.02em; font-family: 'Outfit', sans-serif; }
.score-sub { color: var(--text-muted); font-size: 0.9rem; }

.progress-bar { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; margin: 1.25rem 0 0.5rem; }
.progress-fill { height: 100%; border-radius: 3px; background: linear-gradient(90deg, var(--accent), var(--accent2)); transition: width 1.2s cubic-bezier(0.4,0,0.2,1); box-shadow: 0 0 8px var(--accent-glow); }

.overall-feedback { background: rgba(59,130,246,0.06); border-left: 3px solid var(--accent); padding: 1.1rem 1.25rem; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin-bottom: 1.5rem; font-size: 0.95rem; line-height: 1.65; }

.result-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1rem; }
.result-card.correct { border-left: 3px solid var(--green); }
.result-card.incorrect { border-left: 3px solid var(--red); }
.result-card.partial { border-left: 3px solid var(--yellow); }

.result-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 0.75rem; }
.result-score { font-weight: 700; font-size: 0.95rem; white-space: nowrap; margin-left: 1rem; }
.result-score.full { color: var(--green); }
.result-score.partial { color: var(--yellow); }
.result-score.zero { color: var(--red); }

.answer-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 0.75rem 0; }
.answer-box { background: var(--bg); border-radius: var(--radius-sm); padding: 0.85rem 1rem; font-size: 0.875rem; border: 1px solid var(--border); }
.answer-box .label { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.4rem; font-weight: 700; }
.answer-box pre { white-space: pre-wrap; font-family: 'JetBrains Mono', monospace; font-size: 0.83rem; color: var(--accent2); line-height: 1.6; }

.feedback-box { background: var(--bg); border-radius: var(--radius-sm); padding: 0.85rem 1rem; font-size: 0.875rem; color: var(--text-muted); margin-top: 0.5rem; border: 1px solid var(--border); line-height: 1.6; }
.feedback-box .label { font-size: 0.7rem; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.4rem; font-weight: 700; }

.spinner-page { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 60vh; gap: 1.25rem; }
.spinner { width: 52px; height: 52px; border: 3px solid var(--border); border-top-color: var(--accent); border-right-color: var(--accent2); border-radius: 50%; animation: spin 0.7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.alert { padding: 0.8rem 1.1rem; border-radius: var(--radius-sm); margin-bottom: 1rem; font-size: 0.875rem; font-weight: 500; }
.alert-error { background: rgba(248,113,113,0.08); border: 1px solid rgba(248,113,113,0.25); color: #fca5a5; }

.exam-meta { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.meta-pill { background: rgba(59,130,246,0.08); border: 1px solid rgba(59,130,246,0.2); border-radius: 20px; padding: 0.3rem 0.9rem; font-size: 0.78rem; color: var(--accent2); font-weight: 500; }

.name-step { max-width: 440px; margin: 4rem auto; text-align: center; }
.name-step h2 { font-size: 1.6rem; font-weight: 800; margin-bottom: 0.5rem; letter-spacing: -0.02em; font-family: 'Outfit', sans-serif; }
.name-step p { color: var(--text-muted); margin-bottom: 1.75rem; }

table { width: 100%; border-collapse: collapse; }
th { text-align: left; font-size: 0.72rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; padding: 0.75rem 1.25rem; border-bottom: 1px solid var(--border); font-weight: 700; }
td { padding: 1rem 1.25rem; border-bottom: 1px solid var(--border); font-size: 0.875rem; vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tr:nth-child(even) td { background: rgba(255,255,255,0.015); }
tr:hover td { background: var(--accent-glow) !important; transition: background 0.15s; }

.grade-pill { display: inline-block; font-weight: 700; font-size: 0.8rem; padding: 0.2rem 0.65rem; border-radius: 20px; }
.grade-pill.A { background: rgba(52,211,153,0.12); color: #34d399; }
.grade-pill.B { background: rgba(96,211,148,0.12); color: #60d394; }
.grade-pill.C { background: rgba(251,191,36,0.12); color: #fbbf24; }
.grade-pill.D { background: rgba(251,146,60,0.12); color: #fb923c; }
.grade-pill.F { background: rgba(248,113,113,0.12); color: #f87171; }

.status-pill { display: inline-block; font-size: 0.75rem; padding: 0.2rem 0.65rem; border-radius: 20px; font-weight: 600; }
.status-pill.graded { background: rgba(52,211,153,0.1); color: #34d399; }
.status-pill.grading { background: rgba(59,130,246,0.1); color: var(--accent2); }
.status-pill.pending { background: rgba(90,122,168,0.1); color: var(--text-muted); }
.status-pill.error { background: rgba(248,113,113,0.1); color: #f87171; }

.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; text-align: center; }
.stat-card .num { font-size: 2.2rem; font-weight: 900; letter-spacing: -0.04em; font-family: 'Outfit', sans-serif; background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.stat-card .label { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.25rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; }

.stats-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 1.5rem; }
.dashboard-header { margin-bottom: 1.5rem; }
.dashboard-header h1 { font-size: 1.6rem; font-weight: 800; letter-spacing: -0.02em; font-family: 'Outfit', sans-serif; }
.dashboard-header p { color: var(--text-muted); margin-top: 0.25rem; }

.exam-id-box { background: var(--surface2); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.75rem 1rem; display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem; }
.exam-id-box input { flex: 1; background: transparent; border: none; color: var(--text-muted); font-size: 0.85rem; font-family: 'JetBrains Mono', monospace; box-shadow: none; }
.empty { text-align: center; padding: 3rem; color: var(--text-muted); font-size: 0.9rem; }

@media print {
  body { background: #fff; color: #000; }
  header, .btn, #spinner-page, #error-page { display: none !important; }
  #results-page { display: block !important; }
  .score-banner { border: 2px solid #000; background: #f9f9f9; }
  .grade-letter { -webkit-text-fill-color: #000 !important; }
  .overall-feedback { border-left: 3px solid #000; background: #f5f5f5; color: #000; }
  .result-card { border: 1px solid #ccc; background: #fff; break-inside: avoid; }
  .answer-box, .feedback-box { background: #f5f5f5; color: #000; border-color: #ddd; }
  .answer-box pre { color: #000; }
  .progress-bar { display: none; }
}

@media (max-width: 600px) {
  .action-cards { grid-template-columns: 1fr; }
  .num-row { grid-template-columns: 1fr 1fr; }
  .answer-row { grid-template-columns: 1fr; }
  .hero h1 { font-size: 2rem; }
  .stats-row { grid-template-columns: 1fr 1fr; }
}

/* ── Layout ─────────────────────────────────────── */
.site-header { background: rgba(13,18,32,0.85); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); padding: 1rem 1.75rem; display: flex; align-items: center; position: sticky; top: 0; z-index: 100; }
.header-inner { display: flex; align-items: center; justify-content: space-between; width: 100%; max-width: 1100px; margin: 0 auto; }
.logo { display: flex; align-items: center; gap: 0.6rem; font-weight: 800; font-size: 1.1rem; letter-spacing: -0.02em; }
.logo-icon { font-size: 1.3rem; }
.header-nav { display: flex; align-items: center; gap: 1rem; }
.nav-link { color: var(--text-muted); text-decoration: none; font-size: 0.875rem; font-weight: 500; transition: color 0.2s; }
.nav-link:hover { color: var(--accent); }

.page-main { max-width: 980px; margin: 0 auto; padding: 2.5rem 1.5rem 4rem; }
.page-header { margin-bottom: 2rem; }
.page-title { font-size: 2rem; font-weight: 800; letter-spacing: -0.03em; margin-bottom: 0.4rem; }
.page-subtitle { color: var(--text-muted); font-size: 0.95rem; }

/* ── Home page ───────────────────────────────────── */
.home-main { max-width: 960px; margin: 0 auto; padding: 0 1.5rem 4rem; }
.hero-title { font-size: 3rem; font-weight: 900; letter-spacing: -0.04em; line-height: 1.1; margin-bottom: 1rem; background: linear-gradient(135deg, var(--text) 0%, var(--accent2) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-subtitle { color: var(--text-muted); font-size: 1.1rem; margin-bottom: 2.5rem; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.take-exam-box { margin-top: 1.5rem; text-align: center; }
.btn-lg { padding: 0.85rem 2rem; font-size: 1rem; }
.btn-sm { padding: 0.45rem 1rem; font-size: 0.8rem; }

.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; margin: 3rem 0; }
.feature-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.75rem; transition: border-color 0.2s, transform 0.2s; }
.feature-card:hover { border-color: var(--border-light); transform: translateY(-2px); }
.feature-icon { font-size: 1.75rem; margin-bottom: 0.75rem; }
.feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
.feature-card p { color: var(--text-muted); font-size: 0.875rem; line-height: 1.6; }

.portals-section { margin-top: 1rem; padding-top: 2rem; border-top: 1px solid var(--border); }
.portals-section h2 { font-size: 1.1rem; font-weight: 700; color: var(--text-muted); margin-bottom: 1rem; text-transform: uppercase; letter-spacing: 0.06em; font-size: 0.78rem; }
.portal-links { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }
.portal-chip {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.5rem 1.1rem; border-radius: 20px;
  border: 1px solid var(--border-light);
  color: var(--text-muted); background: var(--surface);
  text-decoration: none; font-size: 0.85rem; font-weight: 600;
  transition: all 0.2s;
}
.portal-chip:hover { transform: translateY(-2px); border-color: var(--accent); color: var(--accent); box-shadow: 0 4px 12px var(--accent-glow); }
.portal-chip .chip-icon { font-size: 1rem; }

.site-footer { text-align: center; padding: 2rem; color: var(--text-muted); font-size: 0.8rem; border-top: 1px solid var(--border); }

/* ── Form card ───────────────────────────────────── */
.form-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 2rem; margin-bottom: 1.5rem; }
.form-section { margin-bottom: 2rem; }
.form-section:last-of-type { margin-bottom: 0; }
.form-section-title { font-size: 0.78rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 1.25rem; padding-bottom: 0.75rem; border-bottom: 1px solid var(--border); }
.form-row { display: flex; gap: 1rem; margin-bottom: 0; }
.form-row.two-col > * { flex: 1; }
.form-row.four-col { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem 2rem; }
.form-actions { display: flex; align-items: center; gap: 1.5rem; margin-top: 2rem; padding-top: 1.5rem; border-top: 1px solid var(--border); justify-content: flex-end; }

.spinner-inline { display: flex; align-items: center; gap: 0.75rem; color: var(--text-muted); font-size: 0.875rem; }
.spinner-ring { width: 44px; height: 44px; border: 3px solid var(--border); border-top-color: var(--accent); border-right-color: var(--accent2); border-radius: 50%; animation: spin 0.7s linear infinite; flex-shrink: 0; }
.spinner-inline .spinner-ring { width: 20px; height: 20px; border-width: 2px; }

.exam-url-link { display: block; font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; color: var(--accent); margin-top: 0.5rem; word-break: break-all; }
.alert-success { background: rgba(52,211,153,0.08); border: 1px solid rgba(52,211,153,0.25); color: #6ee7b7; }

/* ── Take exam page ─────────────────────────────── */
.share-banner { background: rgba(59,130,246,0.1); border: 1px solid var(--accent); border-radius: var(--radius); padding: 1.25rem 1.5rem; margin-bottom: 1.5rem; }
.share-banner input[readonly] { background: var(--bg); border: 1px solid var(--border); }
.exam-header { margin-bottom: 2rem; }
.name-gate-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 2.5rem 2rem; text-align: center; max-width: 480px; margin: 3rem auto; }
.name-gate-title { font-size: 1.3rem; margin-bottom: 0.4rem; }
.name-gate-subtitle { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 1.5rem; }
.name-gate-form { display: flex; flex-direction: column; gap: 1rem; }
.name-gate-form input { text-align: center; font-size: 1.05rem; padding: 0.75rem 1rem; background: var(--bg); }
.question-number { font-size: 0.73rem; color: var(--text-muted); font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; }
.question-points { font-size: 0.75rem; background: rgba(59,130,246,0.1); color: var(--accent2); padding: 0.2rem 0.65rem; border-radius: 20px; font-weight: 600; border: 1px solid rgba(59,130,246,0.2); }
.question-type { display: inline-block; font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; padding: 0.15rem 0.6rem; border-radius: 20px; margin-bottom: 0.75rem; }
.type-mcq { background: rgba(59,130,246,0.1); color: var(--accent2); }
.type-query { background: rgba(52,211,153,0.1); color: var(--green); }
.type-fill_blank { background: rgba(251,191,36,0.1); color: var(--yellow); }
.type-theory { background: rgba(167,139,250,0.1); color: #c4b5fd; }
.question-text { font-size: 1rem; line-height: 1.65; margin-bottom: 1rem; user-select: none; -webkit-user-select: none; }
.question-hint { font-size: 0.85rem; color: var(--text-muted); background: rgba(59,130,246,0.06); border-left: 3px solid var(--accent); padding: 0.5rem 0.85rem; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin-bottom: 0.75rem; }
.schema-label { font-size: 0.7rem; color: var(--accent); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 0.4rem; font-weight: 700; }
.options-grid { display: flex; flex-direction: column; gap: 0.5rem; }
.answer-area { font-family: 'DM Sans', sans-serif; }
.submit-bar { display: flex; justify-content: center; margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border); }

.spinner-page { display: flex; flex-direction: column; align-items: center; justify-content: center; min-height: 70vh; gap: 1rem; text-align: center; padding: 2rem; }
.spinner-title { font-size: 1.1rem; font-weight: 600; }
.spinner-subtitle { color: var(--text-muted); font-size: 0.9rem; }
.error-page { display: flex; align-items: center; justify-content: center; min-height: 70vh; padding: 2rem; }
.error-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 2.5rem; text-align: center; max-width: 480px; }
.error-icon { font-size: 2.5rem; margin-bottom: 1rem; }

/* ── Results page ────────────────────────────────── */
.print-header { display: none; }
.results-hero { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 2rem; margin-bottom: 1.5rem; }
.grade-display { display: flex; align-items: center; gap: 2rem; margin-top: 1.25rem; }
.grade-circle { width: 90px; height: 90px; border-radius: 50%; border: 3px solid var(--border); display: flex; align-items: center; justify-content: center; flex-shrink: 0; background: var(--bg); }
.letter-grade { font-size: 2.75rem; font-weight: 900; }
.grade-a { color: var(--green); }
.grade-b { color: #60d394; }
.grade-c { color: var(--yellow); }
.grade-df { color: var(--red); }
.grade-details { flex: 1; }
.score-line { display: flex; align-items: baseline; gap: 0.5rem; margin-bottom: 0.25rem; }
.score-number { font-size: 1.75rem; font-weight: 800; letter-spacing: -0.03em; }
.score-label { color: var(--text-muted); font-size: 0.875rem; }
.percentage-line { color: var(--text-muted); font-size: 0.95rem; margin-bottom: 0.75rem; font-weight: 600; }
.score-bar-track { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; }
.score-bar-fill { height: 100%; border-radius: 3px; background: linear-gradient(90deg, var(--accent), var(--accent2)); transition: width 1.2s cubic-bezier(0.4,0,0.2,1); width: 0; box-shadow: 0 0 8px var(--accent-glow); }

.feedback-card { background: rgba(59,130,246,0.06); border-left: 3px solid var(--accent); padding: 1.1rem 1.25rem; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin-bottom: 1.5rem; font-size: 0.95rem; line-height: 1.65; }
.feedback-card h2 { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--accent); margin-bottom: 0.5rem; }
.section-heading { font-size: 1.1rem; font-weight: 700; margin-bottom: 1rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.04em; font-size: 0.8rem; }
.result-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; margin-bottom: 0.75rem; }
.result-q { font-size: 0.975rem; line-height: 1.5; flex: 1; }
.result-pts { font-weight: 700; white-space: nowrap; font-size: 0.9rem; }
.result-body { display: flex; flex-direction: column; gap: 0.5rem; }
.result-row { display: flex; gap: 0.5rem; font-size: 0.875rem; }
.result-label { color: var(--text-muted); font-weight: 600; white-space: nowrap; }
.result-value { color: var(--text); word-break: break-word; }
.result-feedback { background: var(--bg); border-radius: var(--radius-sm); padding: 0.75rem 1rem; font-size: 0.875rem; color: var(--text-muted); border: 1px solid var(--border); line-height: 1.6; margin-top: 0.25rem; }
.no-print { }

/* ── Login page ──────────────────────────────────── */
.login-main { display: flex; align-items: center; justify-content: center; min-height: calc(100vh - 120px); padding: 2rem; }
.login-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 2.5rem; width: 100%; max-width: 420px; }
.login-icon { font-size: 2.5rem; text-align: center; margin-bottom: 1rem; }
.login-title { font-size: 1.5rem; font-weight: 800; text-align: center; margin-bottom: 0.4rem; }
.login-subtitle { color: var(--text-muted); font-size: 0.875rem; text-align: center; margin-bottom: 1.75rem; }

/* ── Dashboard page ──────────────────────────────── */
.dash-title-row { display: flex; align-items: flex-start; justify-content: space-between; margin: 2rem 0 1.25rem; }
.stats-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1rem; margin-bottom: 1.5rem; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; text-align: center; }
.stat-label { display: block; font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 700; margin-bottom: 0.4rem; }
.stat-value { display: block; font-size: 1.75rem; font-weight: 900; letter-spacing: -0.04em; background: linear-gradient(135deg, var(--accent), var(--accent2)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.table-wrapper { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.results-table { margin: 0; }
.empty-state { text-align: center; padding: 3rem; color: var(--text-muted); }
.status-badge { display: inline-block; font-size: 0.75rem; padding: 0.2rem 0.65rem; border-radius: 20px; font-weight: 600; }
.status-graded { background: rgba(52,211,153,0.1); color: #34d399; }
.status-grading { background: rgba(59,130,246,0.1); color: var(--accent2); }
.status-pending { background: rgba(90,122,168,0.1); color: var(--text-muted); }
.status-error { background: rgba(248,113,113,0.1); color: #f87171; }
.grade-badge { display: inline-block; font-weight: 700; font-size: 0.8rem; padding: 0.2rem 0.65rem; border-radius: 20px; }
.grade-a { background: rgba(52,211,153,0.12); color: #34d399; }
.grade-b { background: rgba(96,211,148,0.12); color: #60d394; }
.grade-c { background: rgba(251,191,36,0.12); color: #fbbf24; }
.grade-df { background: rgba(248,113,113,0.12); color: #f87171; }
.view-link { color: var(--accent); text-decoration: none; font-size: 0.85rem; font-weight: 500; }
.view-link:hover { text-decoration: underline; }

/* ── Exam preview ────────────────────────────────── */
.preview-toolbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1.5rem; flex-wrap: wrap; gap: 1rem; }
.print-exam-header { display: none; }
.preview-question { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1rem; }
.preview-q-header { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; }
.preview-q-num { font-size: 0.75rem; font-weight: 700; color: var(--accent2); text-transform: uppercase; letter-spacing: 0.06em; }
.preview-q-type { font-size: 0.7rem; background: rgba(59,130,246,0.1); color: var(--accent2); border: 1px solid rgba(59,130,246,0.2); padding: 0.15rem 0.6rem; border-radius: 20px; font-weight: 600; }
.preview-q-pts { margin-left: auto; font-size: 0.8rem; color: var(--text-muted); }
.preview-q-text { font-size: 1rem; line-height: 1.6; margin-bottom: 0.75rem; }
.preview-schema { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0.75rem 1rem; margin-bottom: 0.75rem; font-size: 0.85rem; overflow-x: auto; }
.preview-schema pre { font-family: 'JetBrains Mono', monospace; font-size: 0.8rem; color: var(--accent2); margin: 0; white-space: pre-wrap; word-wrap: break-word; }
.preview-options { display: flex; flex-direction: column; gap: 0.4rem; margin-bottom: 0.5rem; }
.preview-option { font-size: 0.9rem; padding: 0.3rem 0; display: flex; gap: 0.5rem; }
.preview-answer-line { font-size: 0.85rem; color: var(--text-muted); margin-top: 0.5rem; border-top: 1px solid var(--border); padding-top: 0.5rem; }

@media print {
  .no-print { display: none !important; }
  .print-exam-header { display: block; margin-bottom: 1.5rem; border-bottom: 2px solid #000; padding-bottom: 1rem; }
  .print-exam-header h1 { font-size: 1.4rem; font-weight: 800; margin-bottom: 0.25rem; }
  .print-exam-header p { font-size: 0.9rem; color: #444; }
  @page { margin: 1.5cm; }
  body { background: #fff; color: #000; }
  .site-header, .site-footer { display: none !important; }
  .results-hero { background: #f9f9f9; border: 2px solid #000; }
  .letter-grade { color: #000 !important; }
  .feedback-card { border-left: 3px solid #000; background: #f5f5f5; color: #000; }
  .result-card { border: 1px solid #ccc; background: #fff; break-inside: avoid; }
  .result-feedback { background: #f5f5f5; color: #000; border-color: #ddd; }
  .score-bar-track { display: none; }
  /* Exam paper print styles */
  .preview-question { background: #fff; border: 1px solid #ccc; break-inside: avoid; color: #000; }
  .preview-q-num, .preview-q-pts { color: #333; }
  .preview-q-type { background: #eee; color: #333; border-color: #ccc; }
  .preview-q-text { color: #000; }
  .preview-schema { background: #f5f5f5; border-color: #ccc; }
  .preview-schema pre { color: #000; }
  .preview-option { color: #000; }
  .preview-answer-line { color: #444; border-color: #ccc; }
  .form-card { display: none !important; }
  .page-header { display: none !important; }
  #exam-preview { display: block !important; }
}

@media (max-width: 768px) {
  .features { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(3, 1fr); }
  .form-row.four-col { grid-template-columns: 1fr; }
  .grade-display { flex-direction: column; gap: 1rem; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .hero-title { font-size: 2rem; }
  .name-gate-card { padding: 2rem 1.25rem; }
}