:root {
  color-scheme: light;
  --bg: #f4f7fb;
  --surface: #ffffff;
  --text: #132033;
  --muted: #53647c;
  --accent: #2f6df6;
  --accent-dark: #174da9;
  --border: #d8e2f2;
  --correct: #16733b;
  --incorrect: #b42318;
  --shadow: 0 18px 40px rgba(27, 52, 97, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background: linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
  font-family: Arial, Helvetica, sans-serif;
}

.page {
  max-width: 880px;
  margin: 0 auto;
  padding: 56px 24px 80px;
}

.hero,
.quiz-card,
.catalog-card {
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero {
  padding: 42px;
}

.eyebrow,
.quiz-date {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.05;
}

h2 {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
}

h3 {
  font-size: 1.1rem;
  line-height: 1.5;
}

.lead,
.quiz-description,
.load-status,
.search-count,
.feedback {
  color: var(--muted);
  line-height: 1.65;
}

.lead {
  max-width: 680px;
  margin: 20px 0;
  font-size: 1.1rem;
}

.home-link,
.feedback a,
.quiz-links a {
  color: var(--accent-dark);
  font-weight: 700;
}

.load-status {
  margin: 28px 0;
}

.load-status.is-error {
  color: var(--incorrect);
}

.quiz-card,
.catalog-card {
  margin-top: 28px;
  padding: 32px;
}

.quiz-description {
  margin-bottom: 32px;
}

.questions {
  display: grid;
  gap: 30px;
}

.question {
  border-top: 1px solid var(--border);
  padding-top: 28px;
}

.choices {
  display: grid;
  gap: 10px;
}

.choice {
  width: 100%;
  cursor: pointer;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  background: #fbfdff;
  font: inherit;
  text-align: left;
}

.choice:hover:not(:disabled),
.choice:focus-visible,
#quiz-search:focus {
  border-color: var(--accent);
  outline: 3px solid rgba(47, 109, 246, 0.2);
}

.choice:disabled {
  cursor: default;
}

.choice.is-correct {
  border-color: var(--correct);
  background: #eaf8ee;
}

.choice.is-incorrect {
  border-color: var(--incorrect);
  background: #fff0ef;
}

.feedback {
  margin: 16px 0 0;
}

.feedback strong {
  color: var(--text);
}

.feedback a {
  display: inline-block;
  margin-top: 10px;
}

.search-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

#quiz-search {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text);
  background: #fff;
  font: inherit;
}

.search-count {
  margin: 12px 0;
}

.quiz-links {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.quiz-links li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.link-date {
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 640px) {
  .page {
    padding: 24px 16px 48px;
  }

  .hero,
  .quiz-card,
  .catalog-card {
    padding: 24px;
  }

  .quiz-links li {
    flex-direction: column;
    gap: 4px;
  }
}