:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-muted: #eef3f8;
  --text: #1f2937;
  --muted: #5f6b7a;
  --border: #d9dee7;
  --primary: #1f6feb;
  --primary-dark: #174ea6;
  --success: #1f8f4d;
  --danger: #c73535;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 48px 0;
}

.hero__intro {
  max-width: 820px;
  margin-bottom: 32px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--primary-dark);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: 2.75rem;
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: 1.6rem;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 16px;
  font-size: 1.18rem;
  letter-spacing: 0;
}

.hero__intro > p:not(.eyebrow) {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.08rem;
}

.promo-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.promo-card {
  display: grid;
  grid-template-columns: minmax(180px, 42%) minmax(0, 1fr);
  min-height: 320px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  overflow: hidden;
}

.promo-card__image,
.promo-card__placeholder {
  width: 100%;
  height: 100%;
  min-height: 260px;
}

.promo-card__image {
  display: block;
  object-fit: cover;
}

.promo-card__placeholder {
  display: grid;
  place-items: center;
  background: var(--surface-muted);
  color: var(--muted);
  padding: 24px;
  text-align: center;
  font-weight: 700;
}

.promo-card__body {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 24px;
}

.promo-card__body p {
  color: var(--muted);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  margin-top: auto;
  border: 1px solid var(--primary);
  border-radius: 6px;
  background: var(--primary);
  color: #ffffff;
  text-decoration: none;
  font-weight: 700;
  cursor: pointer;
  font: inherit;
}

.button--secondary {
  background: var(--surface);
  color: var(--primary-dark);
}

.button:disabled {
  cursor: wait;
  opacity: 0.7;
}

.quiz,
.info,
.fallback,
.admin-tool {
  padding: 44px 0;
}

.section-heading {
  margin-bottom: 22px;
}

.quiz-card {
  max-width: 820px;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.field-label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-weight: 700;
}

.subject-select {
  width: min(100%, 360px);
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #ffffff;
  color: var(--text);
  font: inherit;
}

.quiz-card__body {
  margin: 24px 0;
}

.quiz-subject {
  min-height: 20px;
  margin: 0 0 8px;
  color: var(--primary-dark);
  font-weight: 700;
}

.choices {
  display: grid;
  gap: 12px;
}

.choice {
  width: 100%;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: #ffffff;
  color: var(--text);
  cursor: pointer;
  font: inherit;
  text-align: left;
}

.choice:hover:not(:disabled) {
  border-color: var(--primary);
}

.choice.is-correct {
  border-color: var(--success);
  background: #e8f7ee;
  color: #145832;
}

.choice.is-wrong {
  border-color: var(--danger);
  background: #fdecec;
  color: #8a2020;
}

.choice:disabled {
  cursor: default;
}

.explanation {
  margin-top: 16px;
  padding: 14px 16px;
  border-left: 4px solid var(--primary);
  background: #eef5ff;
  color: var(--text);
}

.empty-state {
  color: var(--muted);
}

.message-list {
  display: grid;
  gap: 10px;
  margin-bottom: 22px;
}

.message {
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.message--success {
  border-color: #b8e3c8;
  background: #eefaf2;
  color: var(--success);
}

.message--warning {
  border-color: #f3d49b;
  background: #fff8e8;
  color: #7a5200;
}

.message--error {
  border-color: #efb7b7;
  background: #fdecec;
  color: var(--danger);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
}

.admin-tool-table {
  width: 100%;
  border-collapse: collapse;
}

.admin-tool-table th,
.admin-tool-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: middle;
}

.admin-tool-table th {
  background: var(--surface-muted);
  color: var(--muted);
  font-size: 0.9rem;
}

.admin-tool-table tr:last-child td {
  border-bottom: 0;
}

.admin-tool-table__action {
  width: 1%;
  white-space: nowrap;
}

.content-block {
  display: grid;
  grid-template-columns: minmax(220px, 32%) minmax(0, 1fr);
  gap: 28px;
  padding: 28px 0;
  border-top: 1px solid var(--border);
}

.content-block:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.content-block__image {
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: 8px;
  object-fit: cover;
}

.content-block__body h3 {
  font-size: 1.35rem;
}

.rich-text {
  max-width: 860px;
  color: var(--text);
}

.rich-text p:first-child {
  margin-top: 0;
}

.rich-text a {
  color: var(--primary-dark);
  font-weight: 700;
}

.fallback {
  min-height: 100vh;
  display: grid;
  align-items: center;
}

@media (max-width: 920px) {
  .promo-grid,
  .promo-card,
  .content-block {
    grid-template-columns: 1fr;
  }

  .promo-card__image,
  .promo-card__placeholder {
    aspect-ratio: 16 / 9;
    min-height: 220px;
  }
}

@media (max-width: 760px) {
  .hero {
    padding: 36px 0;
  }

  h1 {
    font-size: 2rem;
  }

  .promo-card__body,
  .quiz-card {
    padding: 20px;
  }
}