:root {
  color-scheme: light dark;
  --page: #f5f7fb; --surface: #ffffff; --surface-soft: #f8fafc;
  --ink: #172033; --muted: #64748b; --line: #dbe3ee;
  --brand: #3157d5; --brand-hover: #2648ba; --focus: #7c9cff;
  --badge-bg: #eef2ff; --badge-ink: #3346a8;
  --error-bg: #fff7ed; --error-line: #fed7aa; --error-ink: #7c2d12;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--page); color: var(--ink); line-height: 1.55; }
button, select, textarea { font: inherit; }
.shell { width: min(1120px, calc(100% - 2rem)); margin: 0 auto; padding: 2rem 0 4rem; }
.hero { padding: 1rem 0 1.25rem; }
.eyebrow { margin: 0; color: var(--brand); font-size: .78rem; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.hero h1 { margin: .45rem 0 .65rem; font-size: clamp(2rem, 5vw, 3.25rem); letter-spacing: -.045em; line-height: 1.03; }
.hero-copy { max-width: 760px; margin: 0; color: var(--muted); font-size: 1.05rem; }
.status, .inline-status { min-height: 1.5rem; margin-bottom: .85rem; color: var(--muted); }
.status:empty, .inline-status:empty { min-height: 0; margin: 0; }
.status.loading::before { content: ""; display: inline-block; width: .65rem; height: .65rem; margin-right: .5rem; border-radius: 50%; background: var(--brand); }
.status.error, .inline-status.error { min-height: auto; padding: .8rem 1rem; border: 1px solid var(--error-line); border-radius: 12px; background: var(--error-bg); color: var(--error-ink); }
.filter-panel, .answer-card, .review-card { margin-bottom: 1rem; padding: 1.1rem 1.2rem; border: 1px solid var(--line); border-radius: 16px; background: var(--surface); }
.filters { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)) auto; gap: .85rem; align-items: end; }
label span { display: block; margin-bottom: .35rem; font-size: .86rem; font-weight: 650; }
select, textarea { width: 100%; border: 1px solid #b8c4d4; border-radius: 10px; background: var(--surface); color: var(--ink); }
select { min-height: 2.7rem; padding: .55rem .7rem; }
textarea { min-height: 13rem; padding: .85rem; resize: vertical; }
textarea::placeholder { color: #718096; opacity: 1; }
.button { min-height: 2.7rem; padding: .55rem 1rem; border: 1px solid transparent; border-radius: 10px; cursor: pointer; font-weight: 700; }
.button.primary { background: var(--brand); color: #fff; }
.button.primary:hover:not(:disabled) { background: var(--brand-hover); }
.button.secondary { border-color: var(--line); background: var(--surface-soft); color: var(--ink); }
.button:disabled { cursor: not-allowed; opacity: .5; }
button:focus-visible, select:focus-visible, textarea:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.question-card, .score-card { margin-bottom: 1rem; padding: 1.1rem 1.2rem; border: 1px solid var(--line); border-radius: 16px; background: #fff; color: var(--ink); }
.question-card h2, .score-card h2 { color: var(--ink); }
.question-card h2 { margin: .65rem 0 .1rem; font-size: 1.25rem; line-height: 1.45; }
.question-card p { color: var(--ink); }
.question-card .muted { color: var(--muted); }
.badges { display: flex; flex-wrap: wrap; gap: .35rem; }
.badge { padding: .24rem .55rem; border-radius: 999px; background: var(--badge-bg); color: var(--badge-ink); font-size: .76rem; font-weight: 700; }
.answer-card h2, .review-card h2 { margin: 0 0 .25rem; }
.instructions { margin: 0 0 .8rem; color: var(--muted); }
.actions { display: flex; gap: .65rem; margin-top: .75rem; }
.score-card > h2 { margin: .25rem 0; font-size: 1.8rem; }
.heuristic-warning { margin: 0; color: var(--muted); font-size: .9rem; }
.heuristic-warning strong { color: var(--ink); }
.score-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: .65rem; margin: .9rem 0; }
.metric { padding: .75rem; border-radius: 12px; background: var(--surface-soft); color: var(--ink); }
.metric span, .metric strong, .metric small { display: block; }
.metric strong { font-size: 1.2rem; }
.metric small { color: var(--muted); }
.concept-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; }
.concept-grid h3 { margin-bottom: .25rem; font-size: 1rem; }
.concept-grid ul { margin-top: 0; }
.feedback { margin-bottom: 0; }
.review-card h3 { margin: 1.35rem 0 .5rem; }
.rubric { display: grid; gap: .6rem; margin: 0; }
.rubric div { padding: .75rem; border-radius: 10px; background: var(--surface-soft); }
.rubric dt { font-weight: 750; }
.rubric dd { margin: .2rem 0 0; color: var(--muted); }
.muted { color: var(--muted); }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
@media (prefers-color-scheme: dark) {
  :root { --page: #0f1420; --surface: #182031; --surface-soft: #222c40; --ink: #edf2f8; --muted: #aab7c8; --line: #344157; --brand: #8da7ff; --brand-hover: #7897ff; --focus: #a9baff; }
  .question-card, .score-card { background: #fff; color: #172033; --ink: #172033; --muted: #64748b; --surface-soft: #f8fafc; --line: #dbe3ee; --brand: #3157d5; }
  .badge { background: #eef2ff; color: #3346a8; }
  textarea::placeholder { color: #aab7c8; }
}
@media (max-width: 760px) {
  .shell { width: min(100% - 1rem, 1120px); padding-top: 1rem; }
  .filters { grid-template-columns: 1fr; }
  .score-grid, .concept-grid { grid-template-columns: 1fr 1fr; }
  .actions { flex-direction: column; }
}
@media (max-width: 480px) { .score-grid, .concept-grid { grid-template-columns: 1fr; } }