:root {
  --cream: #fff6ee;
  --coral: #c44b27;
  --coral-deep: #8d2f16;
  --ink: #2a1a14;
  --card: #fffdf9;
  --line: #ead4c6;
  --muted: #6b4e43;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  font-family: "Palatino Linotype", "Songti SC", "Microsoft YaHei", serif;
  background: var(--cream);
  color: var(--ink);
  line-height: 1.75;
}

a {
  color: var(--coral-deep);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.top {
  background: var(--coral);
  color: #fff6ee;
}

.top-inner {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
  min-height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.nav a {
  color: #ffe8dc;
}

.wrap {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  padding: 36px 0 10px;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(1.45rem, 2.6vw, 2rem);
}

.hero p {
  margin: 0 0 8px;
  color: var(--muted);
  max-width: 42em;
}

.wave {
  margin: 16px 0 8px;
  background: var(--card);
  border: 2px solid var(--coral);
  padding: 10px 14px;
}

.section {
  padding: 20px 0 8px;
}

.section h2 {
  margin: 0 0 12px;
  font-size: 1.3rem;
  color: var(--coral-deep);
}

.circles {
  display: flex;
  gap: 12px;
  justify-content: space-between;
  margin: 16px 0;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.circles article {
  flex: 1;
  text-align: center;
  background: var(--card);
  border: 1px solid var(--line);
  padding: 14px 10px 16px;
}

.num {
  width: 56px;
  height: 56px;
  margin: 0 auto 10px;
  border-radius: 50%;
  background: var(--coral);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  font-weight: 700;
}

.circles p {
  margin: 0;
  text-align: left;
  font-size: 0.94rem;
}

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 2px solid var(--coral);
}

.pair article {
  padding: 16px 18px;
}

.pair article:first-child {
  background: #fde8df;
  border-right: 2px solid var(--coral);
}

.pair article:last-child {
  background: var(--card);
}

.pair h3 {
  margin: 0 0 10px;
}

.drag-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
}

.drag-grid article {
  background: var(--card);
  border-top: 6px solid var(--coral);
  padding: 14px;
}

.drag-grid h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
}

.table-wrap {
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--line);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

th,
td {
  padding: 11px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

th {
  background: var(--coral-deep);
  color: #fff6ee;
}

.replay {
  background: #fde8df;
  padding: 18px;
  border-left: 8px solid var(--coral);
}

.replay p {
  margin: 0 0 10px;
}

.faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 6px solid var(--coral);
  margin-bottom: 8px;
  padding: 10px 14px;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

.faq details p {
  margin: 10px 0 4px;
}

footer {
  background: var(--coral-deep);
  color: #ffe8dc;
  padding: 24px 0 28px;
  margin-top: 28px;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

footer p {
  margin: 0 0 8px;
}

@media (max-width: 900px) {
  .circles,
  .pair,
  .drag-grid {
    display: block;
  }

  .pair article:first-child {
    border-right: 0;
    border-bottom: 2px solid var(--coral);
  }

  .top-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 8px 0;
  }
}