:root {
  color-scheme: light;
  --ink: #17152b;
  --muted: #625f73;
  --canvas: #f5f5f8;
  --surface: #ffffff;
  --surface-soft: #fafafe;
  --line: #deddea;
  --accent: #6d43d9;
  --accent-dark: #4e2ca5;
  --accent-soft: #f0ebff;
  --cyan: #12a9a0;
  --success: #137a4b;
  --success-soft: #e8f7ef;
  --danger: #b42318;
  --danger-soft: #fff0ee;
  --radius: 18px;
  --shadow: 0 18px 45px rgba(31, 24, 65, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--canvas);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.55;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

a {
  color: var(--accent-dark);
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 10;
  padding: 10px 14px;
  color: white;
  background: var(--ink);
  border-radius: 8px;
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.hero {
  color: white;
  background:
    radial-gradient(circle at 82% 18%, rgba(18, 169, 160, 0.36), transparent 25%),
    radial-gradient(circle at 12% 84%, rgba(162, 112, 255, 0.24), transparent 28%),
    linear-gradient(135deg, #17152b 0%, #35296e 58%, #6d43d9 100%);
}

.topbar,
.hero-content,
.layout,
footer {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 22px;
}

.brand,
.repo-link {
  color: white;
  text-decoration: none;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 760;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: var(--ink);
  background: #9bf2e9;
  border-radius: 10px;
  font-weight: 900;
}

.repo-link {
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  font-size: 0.9rem;
}

.hero-content {
  padding: 62px 0 72px;
}

.eyebrow,
.panel-label {
  margin: 0 0 8px;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #9bf2e9;
}

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  max-width: 850px;
  margin-bottom: 16px;
  font-size: clamp(2.7rem, 7vw, 5.4rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.hero-copy {
  max-width: 760px;
  margin-bottom: 32px;
  color: #e7e3fa;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-stats div {
  min-width: 150px;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 12px;
  backdrop-filter: blur(10px);
}

.hero-stats strong,
.hero-stats span {
  display: block;
}

.hero-stats strong {
  font-size: 1.05rem;
}

.hero-stats span {
  color: #e7e3fa;
  font-size: 0.82rem;
}

.layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 34px;
  align-items: start;
  padding-block: 54px 80px;
}

.progress-panel {
  position: sticky;
  top: 24px;
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.progress-copy {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 10px;
}

.progress-copy strong {
  font-size: 1.45rem;
}

.progress-copy span {
  color: var(--muted);
  font-size: 0.82rem;
}

.progress-track {
  display: block;
  width: 100%;
  height: 8px;
  overflow: hidden;
  appearance: none;
  background: #e8e7ef;
  border: 0;
  border-radius: 999px;
}

.progress-track::-webkit-progress-bar {
  background: #e8e7ef;
  border-radius: 999px;
}

.progress-track::-webkit-progress-value {
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  border-radius: 999px;
}

.progress-track::-moz-progress-bar {
  background: linear-gradient(90deg, var(--accent), var(--cyan));
  border-radius: 999px;
}

.category-list {
  display: grid;
  gap: 9px;
  margin-top: 22px;
}

.category-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 10px;
  color: var(--ink);
  background: transparent;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.86rem;
}

.category-link:hover,
.category-link:focus-visible {
  background: var(--accent-soft);
}

.category-link span:last-child {
  color: var(--muted);
}

.save-note {
  margin: 22px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.section-heading h2,
.submit-panel h2,
.results h2 {
  margin-bottom: 0;
  font-size: clamp(1.7rem, 3vw, 2.35rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.text-button {
  padding: 6px 0;
  color: var(--muted);
  background: transparent;
  border: 0;
  border-bottom: 1px solid currentColor;
  cursor: pointer;
}

.question-card {
  margin: 0 0 18px;
  padding: 26px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 24px rgba(31, 24, 65, 0.05);
  scroll-margin-top: 24px;
}

.question-card.is-correct {
  border-color: #7ccaa3;
}

.question-card.is-incorrect {
  border-color: #e5a29c;
}

.question-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.category-pill,
.answer-status {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 750;
}

.category-pill {
  color: var(--accent-dark);
  background: var(--accent-soft);
}

.answer-status.correct {
  color: var(--success);
  background: var(--success-soft);
}

.answer-status.incorrect {
  color: var(--danger);
  background: var(--danger-soft);
}

.question-number {
  color: var(--muted);
  font-size: 0.8rem;
}

fieldset {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

legend {
  width: 100%;
  margin-bottom: 17px;
  font-size: 1.14rem;
  font-weight: 760;
  line-height: 1.38;
}

.option-list {
  display: grid;
  gap: 10px;
}

.option {
  position: relative;
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 12px;
  align-items: start;
  padding: 13px 14px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
}

.option:hover {
  border-color: #ad9edc;
}

.option:has(input:checked) {
  background: var(--accent-soft);
  border-color: #9a80df;
}

.option.is-answer {
  background: var(--success-soft);
  border-color: #7ccaa3;
}

.option.is-selected-wrong {
  background: var(--danger-soft);
  border-color: #e5a29c;
}

.option input {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--accent);
}

.review-panel {
  margin-top: 18px;
  padding: 16px 18px;
  color: #2e2944;
  background: #f5f3fb;
  border-left: 4px solid var(--accent);
  border-radius: 0 10px 10px 0;
}

.review-panel h3 {
  margin: 0 0 6px;
  font-size: 0.9rem;
}

.review-panel p {
  margin-bottom: 10px;
  font-size: 0.9rem;
}

.review-panel p:last-child {
  margin-bottom: 0;
}

.review-panel[hidden] {
  display: none;
}

.submit-panel,
.results {
  display: grid;
  align-items: center;
  gap: 24px;
  margin-top: 30px;
  padding: 28px;
  border-radius: var(--radius);
}

.submit-panel {
  grid-template-columns: 1fr auto;
  color: white;
  background: var(--ink);
}

.submit-panel p {
  margin: 8px 0 0;
  color: #cfcae5;
}

.primary-button,
.secondary-button {
  min-height: 46px;
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 780;
  cursor: pointer;
}

.primary-button {
  color: white;
  background: var(--accent);
  border: 1px solid var(--accent);
}

.primary-button:hover {
  background: var(--accent-dark);
}

.secondary-button {
  color: var(--ink);
  background: white;
  border: 1px solid #b4b0c2;
}

.results {
  grid-template-columns: auto minmax(240px, 1fr) minmax(220px, 0.7fr);
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.results[hidden] {
  display: none;
}

.score-ring {
  display: grid;
  width: 112px;
  height: 112px;
  place-items: center;
  background:
    radial-gradient(circle, white 57%, transparent 59%),
    conic-gradient(var(--accent) var(--score-angle, 0deg), #e7e5ed 0);
  border-radius: 50%;
}

.score-ring strong {
  font-size: 1.55rem;
}

.results-copy > p:not(.eyebrow) {
  margin: 8px 0 16px;
  color: var(--muted);
}

.result-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

.topic-scores {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
}

.topic-score {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
  font-size: 0.84rem;
  list-style: none;
}

footer {
  padding: 0 0 44px;
  color: var(--muted);
  font-size: 0.84rem;
  text-align: center;
}

:focus-visible {
  outline: 3px solid rgba(109, 67, 217, 0.4);
  outline-offset: 3px;
}

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .progress-panel {
    position: static;
  }

  .category-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .results {
    grid-template-columns: auto 1fr;
  }

  .topic-scores {
    grid-column: 1 / -1;
  }
}

@media (max-width: 620px) {
  .topbar,
  .hero-content,
  .layout,
  footer {
    width: min(100% - 24px, 1180px);
  }

  .repo-link {
    display: none;
  }

  .hero-content {
    padding: 42px 0 54px;
  }

  .layout {
    padding-top: 32px;
  }

  .category-list {
    grid-template-columns: 1fr 1fr;
  }

  .section-heading,
  .submit-panel {
    align-items: start;
  }

  .submit-panel,
  .results {
    grid-template-columns: 1fr;
  }

  .question-card,
  .submit-panel,
  .results {
    padding: 20px;
  }

  .score-ring {
    width: 96px;
    height: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}
.oneplus-brand{display:flex;align-items:center;gap:12px;margin:18px auto 0;padding-top:15px;border-top:1px solid rgba(255,255,255,.2);font-size:.78rem}.oneplus-brand img{width:34px;height:34px;object-fit:contain;background:#fff;border-radius:50%;padding:3px}.oneplus-brand a{color:inherit;font-weight:700}