/* 省域图鉴 /atlas/ —— 只用站内已有的纸色、墨色与印章红，不引入新图库。 */
:root {
  --bg: #EFE6D2;
  --paper: #F4EDDD;
  --card: #FBF7EC;
  --ink: #2B2418;
  --ink2: #5A5040;
  --ink3: #6A6048; /* 对比度：在 --paper/--card/--bg 三种底色上均 ≥4.5:1（原 #857A64 只有 3.4–3.95） */
  --accent: #8C3B2E;
  --accent2: #3E5B4A;
  --line: rgba(43, 36, 24, .16);
  --line-soft: rgba(43, 36, 24, .09);
  --pad: clamp(18px, 5vw, 56px);
  --serif: "Noto Serif SC", "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", "SimSun", Georgia, serif;
  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.85;
  text-rendering: optimizeLegibility;
}
img, svg { max-width: 100%; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { text-decoration-thickness: 2px; }
.skip-link {
  position: absolute; left: -9999px; top: 0; padding: 12px 18px;
  background: var(--ink); color: var(--paper); z-index: 90;
}
.skip-link:focus { left: 12px; top: 12px; }

/* ---- 顶栏 ---- */
.top {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; gap: 18px;
  padding: 10px var(--pad);
  background: rgba(244, 237, 221, .92);
  border-bottom: 1px solid var(--line-soft);
  backdrop-filter: blur(8px);
}
.brand {
  display: flex; align-items: center; gap: 10px;
  color: var(--ink); text-decoration: none; flex: 0 0 auto;
}
.brand-mark {
  display: grid; place-items: center;
  width: 34px; height: 34px; border-radius: 6px;
  background: var(--accent); color: var(--paper);
  font-size: 18px; line-height: 1;
}
.brand-text { display: flex; flex-direction: column; font-size: 15px; line-height: 1.2; }
.brand-text small { font-family: var(--sans); font-size: 9.5px; letter-spacing: .2em; color: var(--ink3); }
.nav { display: flex; gap: clamp(10px, 2vw, 26px); margin-left: auto; font-family: var(--sans); font-size: 13px; }
.nav a { color: var(--ink2); text-decoration: none; white-space: nowrap; }
.nav a:hover { color: var(--accent); }
.top-actions { display: flex; align-items: center; gap: 10px; }
.lang {
  font-family: var(--sans); font-size: 12px; letter-spacing: .08em;
  min-height: 36px; display: inline-flex; align-items: center;
  color: var(--ink2); text-decoration: none; border: 1px solid var(--line);
  border-radius: 999px; padding: 0 12px;
}
.lang:hover { border-color: var(--accent); color: var(--accent); }

/* ---- 首屏 ---- */
.hero {
  position: relative;
  padding: clamp(40px, 7vw, 84px) var(--pad) clamp(28px, 4vw, 44px);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}
.hero::after {
  content: "陕"; position: absolute; right: -2vw; top: -3vw;
  font-size: clamp(220px, 34vw, 520px); line-height: 1;
  color: var(--accent); opacity: .045; pointer-events: none;
}
.hero-inner { position: relative; max-width: 1120px; margin: 0 auto; }
.eyebrow {
  margin: 0 0 10px; font-family: var(--sans); font-size: 11.5px;
  letter-spacing: .26em; color: var(--accent);
}
.hero h1 {
  margin: 0; font-size: clamp(2.4rem, 7vw, 5rem); line-height: 1.06;
  font-weight: 700; letter-spacing: .02em;
}
.hero h1 .en {
  display: block; margin-top: 10px;
  font-family: var(--sans); font-size: clamp(11px, 1.2vw, 13px);
  letter-spacing: .34em; color: var(--ink3); font-weight: 400;
}
.lede {
  max-width: 46em; margin: 22px 0 0; font-size: clamp(1rem, 1.5vw, 1.12rem);
  color: var(--ink2);
}
.keys {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px; margin: 34px 0 0; padding: 0;
  background: var(--line); border: 1px solid var(--line);
}
.keys div { background: var(--paper); padding: 16px 18px; min-width: 0; }
.keys dt {
  font-family: var(--sans); font-size: 11px; letter-spacing: .16em;
  color: var(--ink3); margin: 0 0 4px;
}
.keys dd { margin: 0; font-size: clamp(1.4rem, 3vw, 2rem); line-height: 1.2; }
.keys dd small { font-family: var(--sans); font-size: 11px; color: var(--ink3); margin-left: 4px; }

/* ---- 章节 ---- */
/* scroll-margin：导航跳转到 #conc 等章节时，标题不要被吸顶栏压住。 */
.sec { max-width: 1120px; margin: 0 auto; padding: clamp(40px, 6vw, 72px) var(--pad); scroll-margin-top: 72px; }
.sec + .sec { border-top: 1px solid var(--line-soft); }
.sec-head { display: grid; grid-template-columns: auto 1fr; column-gap: 16px; align-items: baseline; }
.sec-head .num {
  margin: 0; font-family: var(--sans); font-size: 11px; letter-spacing: .2em;
  color: var(--accent); grid-row: 1 / span 2; padding-top: 8px;
}
.sec-head h2 { margin: 0; font-size: clamp(1.5rem, 3.4vw, 2.2rem); line-height: 1.25; }
.sec-sub { margin: 6px 0 0; color: var(--ink2); font-size: .95rem; }

.prose { max-width: 48em; margin: 22px 0 0; }
.prose p { margin: 0 0 1em; }
.prose strong { font-weight: 700; }
.caveat {
  margin-top: 18px; padding: 12px 16px;
  border-left: 3px solid var(--accent2); background: rgba(62, 91, 74, .06);
  font-size: .92rem; color: var(--ink2);
}

/* ---- 图版 ---- */
.plate { margin: 30px 0 0; }
.plate img {
  display: block; width: 100%; height: auto;
  border: 1px solid var(--line); background: var(--paper);
}
.plate figcaption {
  margin-top: 10px; font-family: var(--sans); font-size: 12.5px;
  color: var(--ink3); display: flex; flex-wrap: wrap; gap: 6px 18px;
}
.plate figcaption a { color: var(--ink2); }

/* ---- 表格 ---- */
.tbl-wrap {
  margin-top: 26px; overflow-x: auto; -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line); background: var(--card);
}
/* 窄屏表格可横向滚动，容器本身要能聚焦，键盘用户才滚得动；聚焦时给出可见指示。 */
.tbl-wrap:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
table { width: 100%; border-collapse: collapse; font-size: .92rem; min-width: 620px; }
caption {
  caption-side: top; text-align: left; padding: 12px 16px 0;
  font-family: var(--sans); font-size: 12px; color: var(--ink3);
}
th, td { padding: 9px 14px; text-align: left; border-bottom: 1px solid var(--line-soft); white-space: nowrap; }
thead th {
  position: sticky; top: 0; z-index: 1;
  background: #F1E8D5; font-family: var(--sans); font-weight: 600;
  font-size: 11.5px; letter-spacing: .06em; color: var(--ink2);
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: rgba(140, 59, 46, .05); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }
td.name { font-weight: 600; }
td.name a { color: var(--ink); text-decoration: none; border-bottom: 1px solid transparent; }
td.name a:hover { border-bottom-color: var(--accent); color: var(--accent); }
.swatch { display: inline-block; width: 9px; height: 9px; border-radius: 2px; margin-right: 7px; vertical-align: 1px; }
.muted { color: var(--ink3); }

/* 极值卡 */
.extremes {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px; margin: 26px 0 0; background: var(--line); border: 1px solid var(--line);
}
.extremes article { background: var(--card); padding: 16px 18px; }
.extremes h3 {
  margin: 0 0 4px; font-family: var(--sans); font-size: 11px;
  letter-spacing: .16em; color: var(--ink3); font-weight: 400;
}
.extremes p { margin: 0; font-size: 1.05rem; }
.extremes p strong { font-size: 1.25rem; }
.extremes small { display: block; margin-top: 4px; font-family: var(--sans); font-size: 11.5px; color: var(--ink3); }

/* ---- 页脚 ---- */
.foot {
  border-top: 1px solid var(--line);
  background: #EFE6D2;
  padding: clamp(32px, 5vw, 56px) var(--pad);
}
.foot-inner {
  max-width: 1120px; margin: 0 auto;
  display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 24px 40px;
  font-family: var(--sans); font-size: 13px; color: var(--ink2);
}
.foot-inner h3 {
  margin: 0 0 10px; font-family: var(--serif); font-size: 15px; color: var(--ink);
}
.foot-inner ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.foot-inner a { color: var(--ink2); text-decoration: none; }
.foot-inner a:hover { color: var(--accent); }
.foot-note { grid-column: 1 / -1; padding-top: 16px; border-top: 1px solid var(--line-soft); font-size: 12px; color: var(--ink3); }

@media (max-width: 860px) {
  body { font-size: 16px; }
  .nav { display: none; }
  .top { gap: 10px; }
  .top-actions { margin-left: auto; }
  .keys { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .extremes { grid-template-columns: 1fr; }
  .foot-inner { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .brand-text small { display: none; }
  .lang { padding: 0 10px; }
  .keys dd { font-size: 1.25rem; }
  th, td { padding: 8px 10px; }
}