/* 五子棋子站 · 门户外壳（设计令牌与总馆/象棋店同族） */
:root {
  --paper: #faf6ed;
  --paper-2: #f3ecdd;
  --card: #fffdf7;
  --ink: #2c2a26;
  --ink-soft: #6b6459;
  --red: #b93a32;
  --red-deep: #93261f;
  --gold: #c9a227;
  --green: #4a7c59;
  --line: #e4dbc8;
  --shadow: 0 6px 24px rgba(60, 45, 20, .08);
  --shadow-sm: 0 1px 2px rgba(60, 45, 20, .12);
  --serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

a { color: inherit; }

/* ---------- 顶栏 ---------- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(250, 246, 237, .92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.head-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 62px;
}

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }

.brand-seal {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: linear-gradient(150deg, var(--red), var(--red-deep));
  color: #fff8ec;
  font-family: var(--serif);
  font-size: 20px;
}

.brand-name { font-family: var(--serif); font-size: 17px; letter-spacing: 2px; }

.site-head nav { display: flex; align-items: center; gap: 18px; font-size: 14px; }
.site-head nav a { text-decoration: none; color: var(--ink-soft); }
.site-head nav a:hover { color: var(--red); }

.nav-cta {
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--red);
  color: #fff8ec !important;
  font-weight: 600;
}

/* ---------- Hero ---------- */
.hero { padding: 46px 20px 18px; text-align: center; }

.hero h1 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: 34px;
  letter-spacing: 2px;
  line-height: 1.4;
}

.hero p {
  margin: 0 auto 20px;
  max-width: 640px;
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1.9;
}

/* ---------- 通用区块 ---------- */
.section { padding: 26px 20px; }
.section h2 {
  margin: 0 0 16px;
  font-family: var(--serif);
  font-size: 22px;
  letter-spacing: 2px;
  text-align: center;
}

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }

.card-item {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-sm);
  min-width: 0;
}

.card-item b {
  display: block;
  font-family: var(--serif);
  font-size: 17px;
  margin-bottom: 8px;
  letter-spacing: 1px;
}

.card-item span { font-size: 13px; color: var(--ink-soft); line-height: 1.85; }

.step-no {
  display: inline-block;
  width: 26px;
  height: 26px;
  line-height: 26px;
  text-align: center;
  border-radius: 50%;
  background: var(--gold);
  color: #fff;
  font-size: 13px;
  margin-right: 8px;
}

.notes { max-width: 720px; margin: 0 auto; font-size: 14px; line-height: 2; color: var(--ink-soft); }
.notes li { margin-bottom: 4px; }

/* ---------- 页脚（与门户逐字一致） ---------- */
footer {
  margin-top: 34px;
  border-top: 1px solid var(--line);
  background: var(--paper-2);
  padding: 28px 20px 34px;
  text-align: center;
  font-size: 13px;
  color: var(--ink-soft);
}

.brand-line { font-family: var(--serif); font-size: 16px; color: var(--ink); letter-spacing: 2px; margin-bottom: 10px; }
.foot-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; margin-bottom: 10px; }
.foot-links a { color: var(--ink-soft); text-decoration: none; }
.foot-links a:hover { color: var(--red); }
footer p { margin: 4px 0; }
footer .slogan { font-family: var(--serif); opacity: .7; }

/* ---------- 响应式（务必置于末尾） ---------- */
@media (max-width: 860px) {
  .cards { grid-template-columns: 1fr; }
  .hero h1 { font-size: 26px; }
  .site-head nav { gap: 12px; font-size: 13px; }
  .site-head nav a:not(.nav-cta) { display: none; }
}