:root {
  color-scheme: light;
  --ink: #151515;
  --muted: #5f656d;
  --line: #d8d2c4;
  --paper: #fbfaf6;
  --panel: #ffffff;
  --accent: #0f766e;
  --accent-2: #a16207;
  --soft: #edf7f4;
  --shadow: 0 18px 48px rgba(22, 26, 29, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
}

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

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(251, 250, 246, 0.94);
  backdrop-filter: blur(14px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 20px;
}

.brand {
  font-weight: 760;
  color: var(--ink);
  letter-spacing: 0;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 14px;
}

.hero {
  display: grid;
  align-items: end;
  min-height: 74vh;
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(13, 42, 39, 0.88), rgba(13, 42, 39, 0.55)),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='1600' height='900' viewBox='0 0 1600 900'%3E%3Crect width='1600' height='900' fill='%23d8d2c4'/%3E%3Cpath d='M120 720h1360' stroke='%238a8170' stroke-width='3'/%3E%3Cpath d='M220 650c120-120 260-170 420-150 160 22 260-80 420-110 160-32 290 24 390 128' fill='none' stroke='%236b8f85' stroke-width='12' opacity='.55'/%3E%3Crect x='180' y='170' width='330' height='360' rx='18' fill='%23fff' opacity='.72'/%3E%3Crect x='560' y='210' width='300' height='260' rx='18' fill='%23fff' opacity='.58'/%3E%3Crect x='920' y='150' width='380' height='410' rx='18' fill='%23fff' opacity='.68'/%3E%3Ccircle cx='1350' cy='270' r='72' fill='%23a16207' opacity='.55'/%3E%3C/svg%3E");
  background-size: cover;
  background-position: center;
}

.hero-inner {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 80px 20px 76px;
  color: #fff;
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 15px;
  font-weight: 700;
  color: #d7f2ec;
}

h1 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(44px, 7vw, 88px);
  line-height: 1.03;
  letter-spacing: 0;
}

.hero p {
  max-width: 720px;
  margin: 22px 0 0;
  font-size: 20px;
  color: #eef7f4;
}

main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 52px 20px 88px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.card {
  min-height: 220px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.mini-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.mini-card h3 {
  margin: 0 0 8px;
  font-size: 18px;
}

.mini-card p {
  margin: 0;
}

.card h2,
.article h2 {
  margin: 0 0 12px;
  font-size: 24px;
  line-height: 1.25;
}

.card p,
.article p,
.article li {
  color: var(--muted);
}

.article {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 44px;
}

.toc {
  position: sticky;
  top: 76px;
  align-self: start;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.toc a {
  display: block;
  padding: 6px 0;
  font-size: 14px;
}

.content {
  min-width: 0;
}

.content h1 {
  margin-bottom: 18px;
  color: var(--ink);
  font-size: 44px;
}

.content h2 {
  margin-top: 36px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

table {
  width: 100%;
  margin-top: 18px;
  border-collapse: collapse;
  border: 1px solid var(--line);
  background: var(--panel);
}

th,
td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  width: 140px;
  color: var(--ink);
  background: #f4f1e9;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 22px 0;
}

.tag {
  padding: 4px 10px;
  border: 1px solid #b8d9d3;
  border-radius: 999px;
  background: var(--soft);
  color: #145b55;
  font-size: 13px;
}

.note {
  margin-top: 28px;
  padding: 18px 20px;
  border-left: 4px solid var(--accent-2);
  background: #fff8e8;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 20px;
  color: var(--muted);
  text-align: center;
}

@media (max-width: 860px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    min-height: 68vh;
  }

  .hero-inner {
    padding-top: 56px;
    padding-bottom: 52px;
  }

  .grid,
  .grid-2,
  .article {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }
}