:root {
  color-scheme: light;
  --page-bg: #f3efe5;
  --paper: #fffdf8;
  --ink: #29261f;
  --muted: #6f685d;
  --line: #ded5c5;
  --accent: #3f725f;
  --accent-soft: #edf5f0;
  --gold: #b58a48;
  --shadow: 0 20px 60px rgba(55, 46, 32, 0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 12% 8%, rgba(78, 128, 106, 0.1), transparent 26rem),
    radial-gradient(circle at 88% 92%, rgba(181, 138, 72, 0.1), transparent 30rem),
    var(--page-bg);
  color: var(--ink);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.85;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-underline-offset: 0.2em;
}

.site-header {
  padding: 52px 24px 42px;
  text-align: center;
}

.brand {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.24em;
}

.site-header h1 {
  margin: 0;
  font-family: "STKaiti", "KaiTi", "Songti SC", serif;
  font-size: clamp(34px, 6vw, 52px);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.25;
}

.dates {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 28px;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.page-shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto 64px;
  padding: clamp(28px, 6vw, 64px);
  border: 1px solid rgba(181, 138, 72, 0.28);
  border-radius: 22px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.lead {
  margin: 0;
  padding: 20px 22px;
  border-left: 4px solid var(--accent);
  border-radius: 4px 12px 12px 4px;
  background: var(--accent-soft);
}

.toc {
  margin: 34px 0 44px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #faf7f0;
}

.toc h2 {
  margin: 0 0 12px;
  font-size: 18px;
}

.toc ol {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px 32px;
  margin: 0;
  padding-left: 1.4em;
}

.toc a {
  color: var(--ink);
  text-decoration: none;
}

.toc a:hover,
.toc a:focus-visible {
  color: var(--accent);
  text-decoration: underline;
}

section {
  scroll-margin-top: 24px;
}

section + section {
  margin-top: 44px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
}

h2,
h3 {
  color: #26231d;
  line-height: 1.45;
}

h2 {
  margin: 0 0 18px;
  font-size: clamp(23px, 3vw, 28px);
}

h2::before {
  display: inline-block;
  width: 5px;
  height: 0.9em;
  margin-right: 12px;
  border-radius: 999px;
  background: var(--gold);
  content: "";
  vertical-align: -0.04em;
}

h3 {
  margin: 28px 0 10px;
  font-size: 18px;
}

p,
ul {
  margin-top: 0;
}

ul {
  padding-left: 1.4em;
}

li + li {
  margin-top: 5px;
}

.data-list {
  display: grid;
  gap: 14px;
  margin-top: 20px;
}

.data-item {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fffefa;
}

.data-item strong {
  display: block;
  margin-bottom: 4px;
  color: var(--accent);
}

.contact-card {
  padding: 22px 24px;
  border: 1px solid rgba(63, 114, 95, 0.3);
  border-radius: 14px;
  background: var(--accent-soft);
}

.contact-card p:last-child {
  margin-bottom: 0;
}

.site-footer {
  padding: 0 24px 46px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

@media (max-width: 640px) {
  .site-header {
    padding: 38px 18px 30px;
  }

  .page-shell {
    width: min(100% - 20px, 920px);
    margin-bottom: 36px;
    padding: 26px 20px 34px;
    border-radius: 16px;
  }

  .lead,
  .toc,
  .contact-card {
    padding: 17px 18px;
  }

  .toc ol {
    grid-template-columns: 1fr;
  }

  section + section {
    margin-top: 34px;
    padding-top: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}