:root {
  --ink: #172033;
  --muted: #657085;
  --line: #dfe5ee;
  --surface: #ffffff;
  --soft: #f5f7fb;
  --brand: #0f766e;
  --brand-dark: #115e59;
  --accent: #b45309;
  --danger: #b91c1c;
  --success: #15803d;
  --radius: 8px;
}

html { font-size: 16px; min-height: 100%; }
body { min-height: 100%; margin-bottom: 60px; color: var(--ink); background: #f8fafc; }
.app-container { max-width: 1180px; }
.navbar { box-shadow: 0 1px 0 rgba(23, 32, 51, .08); }
a { color: var(--brand); }

.exam-hero, .details-hero, .result-hero {
  margin: 24px 0;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, #ffffff 0%, #eef7f5 100%);
}
.exam-hero h1, .details-hero h1, .result-hero h1 { max-width: 760px; margin: 0 0 10px; font-size: 34px; font-weight: 750; letter-spacing: 0; }
.exam-hero p, .details-hero p, .result-hero p { max-width: 720px; color: var(--muted); margin: 0; }
.eyebrow { text-transform: uppercase; font-size: 12px; font-weight: 700; color: var(--brand); letter-spacing: .08em; }

.exam-toolbar {
  display: grid;
  grid-template-columns: 1fr 220px 170px auto;
  gap: 10px;
  margin-bottom: 18px;
  padding: 14px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.exam-toolbar input, .exam-toolbar select, textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
  background: #fff;
  color: var(--ink);
}
.exam-toolbar button, .btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 9px 14px;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid transparent;
  font-weight: 650;
}
.exam-toolbar button, .btn-primary { background: var(--brand); color: #fff; }
.exam-toolbar button:hover, .btn-primary:hover { background: var(--brand-dark); color: #fff; }
.btn-secondary { background: #fff; color: var(--ink); border-color: var(--line); }
.btn-secondary:hover { background: var(--soft); color: var(--ink); }
.full { width: 100%; margin-top: 10px; }

.exam-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.exam-card, .skill-card, .side-panel, .review-card, .kpi-grid article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(23, 32, 51, .04);
}
.exam-card { padding: 18px; display: flex; flex-direction: column; gap: 12px; }
.exam-card-top, .exam-card-actions, .details-hero, .skill-head, .skill-foot, .take-header, .take-actions, .review-card summary, .skill-score div { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.exam-card h2, .skill-card h3 { font-size: 19px; margin: 0; }
.exam-card p, .skill-card p { color: var(--muted); margin: 0; }
.status-pill, .code-pill, .skill-row span, .question-kicker span {
  display: inline-flex;
  border-radius: 999px;
  padding: 4px 9px;
  font-size: 12px;
  background: #eef7f5;
  color: var(--brand-dark);
}
.code-pill { background: #fff7ed; color: var(--accent); }
.skill-row { display: flex; gap: 6px; flex-wrap: wrap; min-height: 28px; }
.exam-card-meta strong { font-size: 26px; }
.exam-card-actions { margin-top: auto; }
.exam-card-actions a { flex: 1; }

.pager { display: flex; gap: 6px; justify-content: center; margin: 24px 0; }
.pager a { min-width: 36px; padding: 7px 10px; border: 1px solid var(--line); border-radius: var(--radius); text-align: center; text-decoration: none; background: #fff; }
.pager a.active { background: var(--brand); color: #fff; }
.empty-state { padding: 42px 20px; text-align: center; background: #fff; border: 1px dashed var(--line); border-radius: var(--radius); }

.back-link { display: inline-block; margin-bottom: 10px; text-decoration: none; font-weight: 650; }
.details-layout, .result-layout { display: grid; grid-template-columns: 1fr 320px; gap: 18px; align-items: start; }
.skill-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.skill-card, .side-panel { padding: 16px; }
.meter { height: 8px; border-radius: 999px; overflow: hidden; background: #e8edf4; }
.meter span { display: block; height: 100%; background: var(--brand); }
.distribution-row { display: flex; justify-content: space-between; padding: 10px 0; border-bottom: 1px solid var(--line); }

.take-shell { margin: 20px 0; }
.timer { padding: 10px 14px; border-radius: var(--radius); background: #fff7ed; color: var(--accent); font-weight: 800; font-variant-numeric: tabular-nums; }
.progress-track { height: 8px; background: #e8edf4; border-radius: 999px; overflow: hidden; margin-bottom: 14px; }
.progress-track span { display: block; height: 100%; width: 0; background: var(--brand); transition: width .2s ease; }
.take-layout { display: grid; grid-template-columns: 1fr 170px; gap: 16px; align-items: start; }
.question-stage, .question-palette { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
.question-panel { display: none; }
.question-panel.active { display: block; }
.question-panel h2 { font-size: 24px; margin: 12px 0 18px; }
.question-kicker { display: flex; gap: 8px; flex-wrap: wrap; }
.choice-list { display: grid; gap: 10px; }
.choice-group h3 { font-size: 14px; color: var(--muted); margin: 10px 0 6px; }
.choice-option { display: flex; gap: 10px; padding: 12px; border: 1px solid var(--line); border-radius: var(--radius); cursor: pointer; }
.choice-option:has(input:checked) { border-color: var(--brand); background: #eef7f5; }
.review-toggle { display: inline-flex; gap: 8px; margin-top: 16px; color: var(--muted); }
.question-palette { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; position: sticky; top: 16px; }
.question-palette button { border: 1px solid var(--line); background: #fff; border-radius: var(--radius); height: 34px; }
.question-palette button.active { background: var(--brand); color: #fff; }
.question-palette button.answered { border-color: var(--brand); }
.question-palette button.review { background: #fff7ed; border-color: #fed7aa; color: var(--accent); }
.take-actions { margin-top: 16px; }

.result-hero { background: #fff; }
.result-hero.passed { border-color: #bbf7d0; }
.result-hero.failed { border-color: #fecaca; }
.score-ring { width: 116px; height: 116px; border-radius: 50%; display: grid; place-content: center; text-align: center; background: #eef7f5; color: var(--brand-dark); }
.score-ring strong { font-size: 30px; line-height: 1; }
.kpi-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 18px; }
.kpi-grid article { padding: 16px; }
.kpi-grid span { color: var(--muted); display: block; }
.kpi-grid strong { font-size: 28px; }
.review-list { display: grid; gap: 10px; }
.review-card { overflow: hidden; }
.review-card summary { padding: 14px 16px; cursor: pointer; }
.review-card.correct summary strong { color: var(--success); }
.review-card.incorrect summary strong { color: var(--danger); }
.review-body { padding: 0 16px 16px; color: var(--muted); }
.skill-score { margin-bottom: 14px; }
.skill-score small { color: var(--danger); }

@media (max-width: 900px) {
  .exam-toolbar, .details-layout, .result-layout, .take-layout { grid-template-columns: 1fr; }
  .exam-grid, .skill-list, .kpi-grid { grid-template-columns: 1fr 1fr; }
  .question-palette { position: static; grid-template-columns: repeat(8, 1fr); }
}

@media (max-width: 560px) {
  .exam-hero h1, .details-hero h1, .result-hero h1 { font-size: 26px; }
  .exam-grid, .skill-list, .kpi-grid { grid-template-columns: 1fr; }
  .details-hero, .result-hero, .take-header, .take-actions { align-items: stretch; flex-direction: column; }
  .score-ring { width: 96px; height: 96px; }
}