:root {
  --bg: #f5f1e8;
  --bg-accent: #efe3c9;
  --surface: rgba(255, 252, 246, 0.92);
  --text: #1f1a14;
  --muted: #635746;
  --line: rgba(77, 61, 37, 0.14);
  --brand: #b45f2f;
  --brand-deep: #7e3e18;
  --shadow: 0 22px 48px rgba(63, 42, 14, 0.10);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.8), transparent 32%),
    linear-gradient(180deg, var(--bg-accent) 0%, var(--bg) 44%, #f8f6f2 100%);
}

a {
  color: var(--brand-deep);
}

.shell {
  width: min(960px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 28px 0 56px;
}

.hero {
  background: linear-gradient(135deg, rgba(255, 248, 236, 0.96), rgba(248, 238, 218, 0.9));
  border: 1px solid var(--line);
  border-radius: 28px;
  padding: 28px;
  box-shadow: var(--shadow);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(180, 95, 47, 0.10);
  color: var(--brand-deep);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.03em;
}

h1 {
  margin: 16px 0 10px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.04;
}

.lead {
  margin: 0;
  max-width: 46rem;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.75;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.nav a,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 14px;
  border: 1px solid rgba(126, 62, 24, 0.18);
  background: rgba(255, 255, 255, 0.66);
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}

.nav a:hover,
.button-link:hover {
  background: rgba(255, 255, 255, 0.9);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.card,
.section {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.card {
  padding: 22px;
}

.section {
  margin-top: 18px;
  padding: 24px;
}

h2 {
  margin: 0 0 14px;
  font-size: 1.35rem;
}

h3 {
  margin: 18px 0 10px;
  font-size: 1rem;
}

p,
li {
  color: var(--muted);
  line-height: 1.8;
}

ul,
ol {
  margin: 0;
  padding-left: 1.25rem;
}

.meta {
  margin-top: 14px;
  font-size: 0.92rem;
  color: var(--muted);
}

.footer {
  margin-top: 20px;
  color: var(--muted);
  font-size: 0.92rem;
  text-align: center;
}

.inline-code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  background: rgba(126, 62, 24, 0.08);
  padding: 1px 6px;
  border-radius: 8px;
}

@media (max-width: 640px) {
  .shell {
    width: min(100vw - 20px, 960px);
    padding-top: 18px;
    padding-bottom: 36px;
  }

  .hero,
  .card,
  .section {
    padding: 18px;
    border-radius: 20px;
  }
}