/* 天宁 · 基础样式
   纯静态，无框架，无外部依赖（国内访问不会被 CDN 拖慢或墙掉） */

:root {
  --ink: #16211f;
  --ink-2: #46524f;
  --ink-3: #7b8783;
  --brand: #0e5a63;
  --brand-2: #16766c;
  --brand-soft: #eaf3f1;
  --accent: #b8894a;
  --bg: #fbfaf7;
  --card: #ffffff;
  --line: #e3e0d8;
  --radius: 14px;
  --wrap: 1120px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 22px; }

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(251, 250, 247, .92);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 66px; gap: 18px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 30px; height: 30px; border-radius: 9px; flex: none;
  background: linear-gradient(140deg, var(--brand), var(--brand-2));
  color: #fff; display: grid; place-items: center; font-size: 15px; font-weight: 800;
  letter-spacing: .5px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-text strong { font-size: 17px; letter-spacing: 1px; }
.brand-text span { font-size: 11px; color: var(--ink-3); letter-spacing: .6px; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  padding: 8px 13px; border-radius: 9px; color: var(--ink-2);
  font-size: 15px; white-space: nowrap;
}
.nav a:hover { background: var(--brand-soft); color: var(--brand); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--brand); font-weight: 600; background: var(--brand-soft); }

.nav-toggle {
  display: none; border: 1px solid var(--line); background: var(--card);
  border-radius: 9px; padding: 7px 11px; font-size: 14px; color: var(--ink-2); cursor: pointer;
}

/* ---------- 区块 ---------- */
.section { padding: 64px 0; }
.section--tight { padding: 44px 0; }
.section--alt { background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

.eyebrow {
  display: inline-block; font-size: 12.5px; letter-spacing: 2px;
  color: var(--brand-2); font-weight: 700; margin-bottom: 10px;
}
h1, h2, h3, h4 { line-height: 1.35; margin: 0 0 14px; font-weight: 700; letter-spacing: .3px; }
h1 { font-size: clamp(30px, 4.6vw, 46px); letter-spacing: 1px; }
h2 { font-size: clamp(23px, 2.9vw, 31px); }
h3 { font-size: 19px; }
p { margin: 0 0 15px; color: var(--ink-2); }
.lead { font-size: 17.5px; color: var(--ink-2); max-width: 760px; }
.muted { color: var(--ink-3); font-size: 14px; }

/* ---------- 首屏 ---------- */
.hero {
  padding: 74px 0 58px;
  background:
    radial-gradient(1100px 420px at 82% -8%, rgba(22, 118, 108, .12), transparent 62%),
    radial-gradient(760px 340px at 6% 8%, rgba(184, 137, 74, .10), transparent 60%);
}
.hero h1 { max-width: 760px; }
.hero .lead { margin-top: 4px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 999px; font-size: 15.5px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: .18s ease;
}
.btn--primary { background: var(--brand); color: #fff; }
.btn--primary:hover { background: var(--brand-2); text-decoration: none; }
.btn--ghost { background: transparent; color: var(--brand); border-color: #cdd8d5; }
.btn--ghost:hover { background: #fff; text-decoration: none; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 18px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px 22px;
}
.card h3 { margin-bottom: 8px; font-size: 17.5px; }
.card p { margin: 0; font-size: 15px; }
.card--soft { background: var(--brand-soft); border-color: #d6e6e2; }

.stat { font-size: 27px; font-weight: 800; color: var(--brand); line-height: 1.2; }
.stat-label { font-size: 13.5px; color: var(--ink-3); margin-top: 2px; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: #fff; }
table { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 560px; }
th, td { padding: 13px 16px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: #f6f5f0; font-weight: 700; font-size: 14px; color: var(--ink); white-space: nowrap; }
tr:last-child td { border-bottom: none; }
td.num { font-variant-numeric: tabular-nums; white-space: nowrap; }

/* ---------- 提示条 ---------- */
.notice {
  border-left: 3px solid var(--accent);
  background: #fdf8ef; border-radius: 0 10px 10px 0;
  padding: 15px 18px; font-size: 14.5px; color: #6b5423;
}
.notice strong { color: #4a3a17; }

/* ---------- FAQ ---------- */
.faq-item {
  background: #fff; border: 1px solid var(--line); border-radius: 12px;
  margin-bottom: 12px; overflow: hidden;
}
.faq-item summary {
  padding: 16px 20px; font-weight: 600; cursor: pointer; font-size: 16px;
  list-style: none; display: flex; justify-content: space-between; gap: 14px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; color: var(--brand); font-weight: 400; font-size: 20px; line-height: 1; }
.faq-item[open] summary::after { content: "−"; }
.faq-item .faq-body { padding: 0 20px 18px; color: var(--ink-2); font-size: 15.2px; }
.faq-item .faq-body p:last-child { margin-bottom: 0; }

/* ---------- 页脚 ---------- */
.site-footer {
  background: #12201e; color: #b9c6c3; padding: 46px 0 30px; font-size: 14.5px;
  margin-top: 10px;
}
.site-footer a { color: #cfe0dc; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 30px; }
.site-footer h4 { color: #fff; font-size: 14px; letter-spacing: 1.4px; margin-bottom: 12px; font-weight: 600; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 8px; }
.footer-bottom {
  border-top: 1px solid #223230; margin-top: 30px; padding-top: 20px;
  display: flex; flex-wrap: wrap; gap: 10px 22px; justify-content: space-between;
  font-size: 13px; color: #8fa09c;
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .nav { display: none; }
  .nav.is-open {
    display: flex; flex-direction: column; align-items: stretch;
    position: absolute; left: 12px; right: 12px; top: 66px;
    background: #fff; border: 1px solid var(--line); border-radius: 12px;
    padding: 8px; box-shadow: 0 14px 34px rgba(0,0,0,.10); gap: 2px;
  }
  .nav-toggle { display: inline-block; }
  .section { padding: 46px 0; }
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero { padding: 46px 0 40px; }
}