:root {
  color-scheme: light;
  --ink: #17212b;
  --muted: #667482;
  --line: #dfe7ee;
  --surface: #ffffff;
  --bg: #f4f7fb;
  --accent: #1464d2;
  --accent-dark: #0b4da8;
  --good: #18864b;
  --bad: #c23a3a;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: radial-gradient(circle at top right, #e8f1ff, var(--bg) 42%); color: var(--ink); }
.app-shell { width: min(960px, calc(100% - 32px)); margin: 0 auto; padding: 46px 0 70px; }
.hero { display: flex; justify-content: space-between; gap: 24px; align-items: flex-start; margin-bottom: 30px; }
.brand-logo { display: block; flex: 0 0 auto; width: clamp(72px, 12vw, 120px); height: auto; margin: 0 2px 0 0; border-radius: 14px; object-fit: contain; }
.hero > div:first-of-type { flex: 1 1 auto; }
.header-actions { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 8px; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 8px; font-size: clamp(2rem, 5vw, 3.5rem); letter-spacing: -.04em; }
h2 { margin-bottom: 8px; font-size: clamp(1.4rem, 3vw, 2rem); }
.subtitle { color: var(--muted); font-size: 1.05rem; max-width: 600px; }
.eyebrow { margin-bottom: 8px; color: var(--accent); font-size: .76rem; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.card, .question-card { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 16px 45px rgba(31, 61, 93, .08); }
.card { padding: clamp(22px, 5vw, 42px); }
.modal-card { max-width: 720px; margin: 0 auto; }
.setup-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
label > span { display: block; margin-bottom: 8px; color: var(--muted); font-size: 1.0rem; font-weight: 700; }
.identity-form { display: grid; grid-template-columns: 1fr; gap: 16px; margin: 24px 0; }
.identity-form input { width: 100%; border: 1px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink); padding: 13px 12px; font: inherit; }
.identity-form input:focus { outline: 3px solid rgba(20, 100, 210, .2); border-color: var(--accent); }
.exam-category { margin: 24px 0 8px; padding: 16px 20px; border: 2px solid #8f2525; border-radius: 14px; background: linear-gradient(135deg, #fff1f1, #fffafa); color: #7b1717; box-shadow: 0 8px 20px rgba(143, 37, 37, .16); font-size: 1.15rem; font-weight: 800; letter-spacing: .02em; text-align: center; }
.choice-buttons { display: flex; gap: 8px; margin-top: 10px; padding: 10px; border: 1px solid #8795a8; border-radius: 14px; background: #f7f9fc; box-shadow: 0 4px 12px rgba(31, 45, 61, .08); }
.choice-button { flex: 1; margin: 10px 5px 0 0; cursor: pointer; }
.choice-button input { position: absolute; opacity: 0; pointer-events: none; }
.choice-button span { display: block; padding: 13px 12px; border: 1px solid var(--line); border-radius: 10px; background: #efefef; color: var(--muted); text-align: center; font-weight: 750; transition: .15s ease; }
.choice-button span:hover { border-color: #9bbce8; background: #f7faff; }
.choice-button input:checked + span { border-color: var(--accent); background: var(--accent); color: #fff; box-shadow: 0 5px 14px rgba(20, 100, 210, .2); }
.choice-button input:focus-visible + span { outline: 3px solid rgba(20, 100, 210, .25); outline-offset: 2px; }
.actions, .quiz-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
#setup .actions { justify-content: flex-end; }
.button { border: 0; border-radius: 10px; cursor: pointer; padding: 12px 18px; font: inherit; font-weight: 750; transition: transform .15s, background .15s; }
.button:hover:not(:disabled) { transform: translateY(-1px); }
.button:disabled { cursor: not-allowed; opacity: .45; }
.button-primary { background: var(--accent); color: #fff; }
.button-primary:hover:not(:disabled) { background: var(--accent-dark); }
.button-secondary { background: #eaf1fb; color: var(--accent-dark); }
.button-quiet { background: transparent; color: var(--muted); border: 1px solid var(--line); }
.button-quiet:hover(:disabled) { transform: translateY(-1px); }
.hidden { display: none !important; }
.quiz-toolbar { display: flex; justify-content: space-between; gap: 20px; align-items: center; margin: 10px 0 16px; }
.quiz-status { display: flex; align-items: center; gap: 10px; }
.score-badge { padding: 10px 14px; border-radius: 999px; background: #eaf1fb; color: var(--accent-dark); font-weight: 800; white-space: nowrap; }
.timer { padding: 10px 14px; border-radius: 999px; background: #fff2d9; color: #9a6100; font-variant-numeric: tabular-nums; font-weight: 800; white-space: nowrap; }
.timer-warning { background: #fff0f0; color: var(--bad); }
.progress-track { height: 8px; margin-bottom: 20px; overflow: hidden; border-radius: 99px; background: #e4ebf3; }
.progress-track div { height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.question-card { min-height: 330px; padding: clamp(22px, 5vw, 40px); }
.question-meta { color: var(--muted); font-size: .82rem; }
.question-text { margin: 22px 0; font-size: clamp(1.1rem, 2.3vw, 1.4rem); line-height: 1.5; }
.question-image { display: block; max-width: 100%; max-height: 360px; margin: 20px auto 24px; object-fit: contain; border-radius: 8px; }
.choices { display: grid; gap: 10px; }
.choice { display: flex; gap: 12px; align-items: flex-start; padding: 14px; border: 1px solid var(--line); border-radius: 12px; cursor: pointer; line-height: 1.4; }
.choice:hover { border-color: #9bbce8; background: #f7faff; }
.choice input { margin-top: 3px; accent-color: var(--accent); }
.choice.correct { border-color: #8fd0aa; background: #effaf3; }
.choice.incorrect { border-color: #edaaaa; background: #fff2f2; }
.explanation { margin-top: 16px; color: var(--muted); font-size: .9rem; }
.correct-answer { color: var(--good); }
.result-card { margin-top: 18px; }
.result-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin: 24px 0; }
.stat { padding: 15px; border-radius: 12px; background: #f3f7fc; }
.stat strong { display: block; font-size: 1.4rem; }
.stat span { color: var(--muted); font-size: .8rem; }
.review-list { display: grid; gap: 10px; margin-bottom: 24px; }
.review-item { padding: 13px 15px; border-left: 4px solid var(--line); background: #f8fafc; font-size: .9rem; line-height: 1.45; }
.review-item.good { border-color: var(--good); }
.review-item.bad { border-color: var(--bad); }
@media (max-width: 700px) {
  .app-shell { width: min(100% - 20px, 960px); padding-top: 25px; }
  .hero { display: block; }
  .brand-logo { width: 88px; margin-bottom: 16px; }
  .header-actions { justify-content: flex-start; margin-top: 10px; }
  .hero .button { margin-top: 10px; }
  .setup-grid, .result-stats { grid-template-columns: 1fr; }
  .identity-form { grid-template-columns: 1fr; }
  .quiz-toolbar { align-items: flex-start; }
  .quiz-status { align-items: flex-end; flex-direction: column; }
}