/* ============================================================
   明蜀王陵数字导览 · 样式表（第一部分：基础 / 首页 / 地图）
   设计基调：宣纸底 / 墨色字 / 朱砂点睛 / 描金细线
   ============================================================ */

:root{
  --paper:#F7F2E7;
  --paper-2:#F1E9D8;
  --paper-3:#E8DEC6;
  --ink:#1B1815;
  --ink-2:#3C342B;
  --ink-3:#6B6055;
  --ink-4:#9A8E7E;
  --cinnabar:#A32B25;
  --cinnabar-2:#C4443A;
  --gold:#B99457;
  --gold-2:#D8BE8A;
  --jade:#5D7364;
  --line:#D9CDB4;
  --line-2:#C9B98F;

  --font-serif:"Songti SC","STSong","SimSun","Source Han Serif SC","Noto Serif CJK SC",serif;
  --font-sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;

  --r:2px;
  --topbar-h:56px;
  --tabbar-h:60px;
  --pad:18px;
  --shadow:0 2px 10px rgba(58,46,28,.07);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink-2);
  font-family:var(--font-sans);
  font-size:15px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;border:0}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer;-webkit-tap-highlight-color:transparent}
h1,h2,h3,h4{margin:0;font-family:var(--font-serif);color:var(--ink);font-weight:600;line-height:1.35}
p{margin:0 0 .8em}
p:last-child{margin-bottom:0}
ol,ul{margin:0;padding:0;list-style:none}
strong{color:var(--ink);font-weight:600}
:focus-visible{outline:2px solid var(--cinnabar);outline-offset:2px}

body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:
    repeating-linear-gradient(0deg,rgba(160,140,100,.035) 0 1px,transparent 1px 3px),
    radial-gradient(120% 80% at 50% 0%,rgba(216,190,138,.20),transparent 60%);
}

/* ---------- 顶部栏 ---------- */
.topbar{
  position:fixed;top:0;left:0;right:0;z-index:60;
  height:var(--topbar-h);
  padding-top:env(safe-area-inset-top);
  background:rgba(247,242,231,.86);
  backdrop-filter:saturate(160%) blur(12px);
  -webkit-backdrop-filter:saturate(160%) blur(12px);
  border-bottom:1px solid rgba(201,185,143,.55);
}
.topbar.is-scrolled{box-shadow:0 2px 14px rgba(58,46,28,.10)}
.topbar-in{
  height:var(--topbar-h);max-width:760px;margin:0 auto;
  padding:0 var(--pad);display:flex;align-items:center;justify-content:space-between;gap:8px;
}
.brand{display:flex;align-items:center;gap:9px;text-align:left}
.brand-seal{
  width:30px;height:30px;flex:0 0 30px;
  display:grid;place-items:center;
  background:var(--cinnabar);color:#FBF6EC;
  font-family:var(--font-serif);font-size:17px;font-weight:700;
  border-radius:2px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.22);
}
.brand-txt{display:flex;flex-direction:column;line-height:1.15}
.brand-txt b{font-family:var(--font-serif);font-size:15.5px;color:var(--ink);letter-spacing:.06em}
.brand-txt i{font-style:normal;font-size:10.5px;color:var(--ink-4);letter-spacing:.22em}
.badge-npu{
  font-size:10px;letter-spacing:.04em;color:var(--cinnabar);
  border:1px solid rgba(163,43,37,.42);
  padding:3px 7px;border-radius:2px;white-space:nowrap;
  background:rgba(163,43,37,.045);
}

/* ---------- 页面容器 ---------- */
main{position:relative;z-index:1;padding-top:var(--topbar-h);padding-bottom:calc(var(--tabbar-h) + env(safe-area-inset-bottom))}
.page{display:none;animation:fade .28s ease both}
.page.is-active{display:block}
@keyframes fade{from{opacity:0}to{opacity:1}}
.wrap{max-width:760px;margin:0 auto;padding:0 var(--pad) 40px}

.sec-label{
  position:relative;margin:34px 0 14px;padding-left:14px;
  font-size:17px;letter-spacing:.04em;
}
.sec-label::before{
  content:"";position:absolute;left:0;top:.34em;
  width:4px;height:1.02em;background:var(--cinnabar);border-radius:1px;
}
.sec-label::after{
  content:"";position:absolute;left:0;right:0;bottom:-9px;height:1px;
  background:linear-gradient(90deg,var(--line) 0%,transparent 92%);
}
.sec-note{margin:-2px 0 14px;font-size:12.5px;color:var(--ink-4);line-height:1.6}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  min-height:clamp(420px,60svh,600px);
  display:flex;flex-direction:column;justify-content:flex-end;
  padding:0 var(--pad) 34px;overflow:hidden;
  background:linear-gradient(165deg,#241F19 0%,#332A21 46%,#1B1815 100%);
}
.hero-media{position:absolute;inset:0;z-index:0}
.hero-media img{width:100%;height:100%;object-fit:cover;object-position:center 46%;opacity:.92}
.hero-scrim{
  position:absolute;inset:0;
  background:
    linear-gradient(180deg,rgba(20,17,13,.18) 0%,rgba(20,17,13,.06) 30%,rgba(20,17,13,.72) 84%,#14110D 100%),
    radial-gradient(70% 50% at 78% 18%,rgba(163,43,37,.18),transparent 70%);
}
.hero-body{position:relative;z-index:2;max-width:760px;margin:0 auto;width:100%}
.hero-kicker{font-size:11.5px;letter-spacing:.32em;color:var(--gold-2);margin-bottom:12px;text-indent:.32em}
.hero-title{
  font-size:clamp(38px,12.5vw,62px);line-height:1.06;letter-spacing:.06em;
  color:#FBF6EC;margin-bottom:14px;font-weight:600;
}
.hero-title .t1{display:block;font-size:.56em;letter-spacing:.26em;color:var(--gold-2);margin-bottom:2px}
.hero-title .t2{display:block;text-shadow:0 2px 20px rgba(0,0,0,.42)}
.hero-sub{color:rgba(247,242,231,.76);font-size:13px;letter-spacing:.04em;margin-bottom:0}
.hero-seal{
  position:absolute;right:2px;bottom:46px;
  width:52px;height:52px;display:grid;grid-template-columns:1fr 1fr;place-items:center;
  background:var(--cinnabar);color:#FBF6EC;
  font-family:var(--font-serif);font-size:17px;font-weight:700;line-height:1;
  border-radius:3px;transform:rotate(-6deg);
  box-shadow:inset 0 0 0 1.5px rgba(255,255,255,.28),0 6px 18px rgba(0,0,0,.35);
}
.hero-seal span{display:block;transform:translateY(1px)}
.hero-scroll{
  position:absolute;left:50%;bottom:12px;translate:-50% 0;z-index:2;
  width:20px;height:32px;border:1px solid rgba(247,242,231,.34);border-radius:11px;
}
.hero-scroll span{
  position:absolute;left:50%;top:6px;translate:-50% 0;
  width:3px;height:7px;border-radius:2px;background:var(--gold-2);
  animation:sc 1.9s ease-in-out infinite;
}
@keyframes sc{0%,100%{opacity:.25;transform:translateY(0)}50%{opacity:1;transform:translateY(9px)}}

/* 简介卡 */
.intro-card{
  margin-top:24px;padding:20px 18px;position:relative;
  background:linear-gradient(180deg,#FFFDF7,#FAF4E6);
  border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);
}
.intro-card::before{
  content:"";position:absolute;inset:5px;
  border:1px solid rgba(201,185,143,.36);border-radius:1px;pointer-events:none;
}
.intro-card .sec-label{margin-top:0}
.intro-card p{font-size:14px;color:var(--ink-2)}
.intro-note{font-size:12px!important;color:var(--ink-4)!important;margin-top:12px!important}

/* 入口网格 */
.entry-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.entry{
  display:flex;flex-direction:column;align-items:flex-start;gap:6px;
  padding:16px 14px;text-align:left;
  background:#FFFDF7;border:1px solid var(--line);border-radius:var(--r);
  box-shadow:var(--shadow);transition:transform .16s;
}
.entry:active{transform:scale(.975)}
.entry-ic{
  width:34px;height:34px;display:grid;place-items:center;margin-bottom:2px;
  color:var(--cinnabar);background:rgba(163,43,37,.07);border-radius:2px;
}
.entry-ic svg{width:19px;height:19px}
.entry b{font-family:var(--font-serif);font-size:16px;color:var(--ink);letter-spacing:.04em}
.entry i{font-style:normal;font-size:11.5px;color:var(--ink-4)}

/* 扫码卡 */
.scan-card{
  margin-top:16px;padding:16px;display:flex;align-items:center;gap:14px;
  background:linear-gradient(135deg,#2A241C,#1B1815);border-radius:var(--r);color:#F0E8D8;
}
.scan-qr{width:66px;height:66px;flex:0 0 66px;padding:4px;background:#fff;border-radius:2px}
.scan-qr svg{width:100%;height:100%;display:block}
.scan-txt b{display:block;font-family:var(--font-serif);font-size:14px;margin-bottom:3px;color:#FBF6EC}
.scan-txt i{display:block;font-style:normal;font-size:11.5px;color:rgba(240,232,216,.62);line-height:1.6}

.foot{max-width:760px;margin:0 auto;padding:26px var(--pad) 34px;text-align:center}
.foot-line{font-size:11.5px;color:var(--ink-4);margin:0 0 4px}
.foot-line.dim{color:rgba(154,142,126,.72)}

/* ---------- 内页头部 ---------- */
.page-head{
  padding:30px var(--pad) 22px;max-width:760px;margin:0 auto;
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(232,222,198,.34),transparent);
}
.page-kicker{font-size:11px;letter-spacing:.3em;color:var(--cinnabar);margin-bottom:8px;text-indent:.3em}
.page-title{font-size:clamp(26px,8vw,34px);letter-spacing:.08em;margin-bottom:10px}
.page-desc{font-size:13px;color:var(--ink-3);margin:0;line-height:1.7}

/* ---------- 媒体占位 ---------- */
.media{position:relative;overflow:hidden;background:var(--paper-3);border-radius:var(--r)}
.media::after{
  content:"实景图片待补充";
  position:absolute;inset:0;z-index:0;display:grid;place-items:center;
  font-size:12px;letter-spacing:.16em;color:rgba(107,96,85,.62);
  background:
    repeating-linear-gradient(135deg,rgba(201,185,143,.30) 0 8px,transparent 8px 16px),
    linear-gradient(160deg,#EFE6D2,#DFD2B4);
}
.media img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.media img.is-missing{display:none}

/* ---------- 地图 ---------- */
.map-card{padding:12px;background:#FFFDF7;border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow)}
.map-legend{display:flex;gap:14px;flex-wrap:wrap;padding:2px 4px 10px;font-size:11.5px;color:var(--ink-3)}
.map-legend span{display:inline-flex;align-items:center;gap:5px}
.lg{width:9px;height:9px;border-radius:50%;display:inline-block}
.lg-tomb{background:var(--cinnabar)}
.lg-fac{background:var(--jade)}
.lg-gate{background:var(--gold);border-radius:1px}
.map-stage{background:#F3ECDB;border:1px solid var(--line-2);border-radius:1px;overflow:hidden}
.site-map{width:100%;height:auto;display:block;touch-action:manipulation}

.poi{cursor:pointer}
.poi-halo{fill:rgba(163,43,37,.10)}
.poi:hover .poi-halo,.poi:focus-visible .poi-halo{fill:rgba(163,43,37,.20)}
.poi-dot{stroke:#FFFDF7;stroke-width:2.5}
.poi-dot.tomb{fill:var(--cinnabar)}
.poi-dot.fac{fill:var(--jade)}
.poi-dot.gate{fill:var(--gold)}
.poi-num{font-family:var(--font-sans);font-size:15px;font-weight:700;fill:#FFFDF7;text-anchor:middle;pointer-events:none}
.poi-ic{font-family:var(--font-serif);font-size:12px;fill:#FFFDF7;text-anchor:middle;pointer-events:none}
.poi-ic-gate{font-family:var(--font-serif);font-size:11px;fill:#2B2418;text-anchor:middle;pointer-events:none}
.poi-name{font-family:var(--font-serif);font-size:13px;fill:var(--ink);text-anchor:middle;pointer-events:none;letter-spacing:.04em}
.poi-name.sm{font-size:11.5px;fill:var(--ink-3)}
.map-north{font-family:var(--font-serif);font-size:13px;fill:#8C7A55;text-anchor:middle}

.route-line{fill:none;stroke-linecap:round;opacity:0;transition:opacity .3s}
.route-essence{stroke:var(--cinnabar);stroke-width:2.5;stroke-dasharray:7 5}
.route-deep{stroke:var(--jade);stroke-width:2.5;stroke-dasharray:2 6}
.site-map.show-essence .route-essence{opacity:.72}
.site-map.show-deep .route-deep{opacity:.72}
.map-hint{margin:10px 2px 0;font-size:11.5px;color:var(--ink-4);text-align:center;line-height:1.6}

/* ---------- 路线 ---------- */
.route-tabs{display:flex;gap:8px;margin-bottom:12px}
.route-tab{
  flex:1;padding:10px 8px;border:1px solid var(--line);border-radius:var(--r);
  background:#FFFDF7;font-size:13.5px;color:var(--ink-3);
  display:flex;flex-direction:column;align-items:center;gap:1px;transition:all .18s;
}
.route-tab i{font-style:normal;font-size:11px;color:var(--ink-4)}
.route-tab.is-on{
  background:var(--cinnabar);border-color:var(--cinnabar);color:#FBF6EC;
  box-shadow:0 4px 14px rgba(163,43,37,.24);
}
.route-tab.is-on i{color:rgba(251,246,236,.72)}

.route-panel{display:none;animation:fade .24s ease both}
.route-panel.is-on{display:block}

.steps{counter-reset:s;display:flex;flex-direction:column}
.steps li{position:relative;padding:0 0 18px 40px;display:flex;flex-direction:column;gap:2px}
.steps li::before{
  counter-increment:s;content:counter(s);
  position:absolute;left:0;top:1px;width:26px;height:26px;display:grid;place-items:center;
  border:1px solid var(--line-2);border-radius:50%;
  background:#FFFDF7;font-size:12px;color:var(--cinnabar);font-weight:600;
}
.steps li::after{
  content:"";position:absolute;left:13px;top:30px;bottom:4px;width:1px;
  background:linear-gradient(180deg,var(--line),transparent);
}
.steps li:last-child{padding-bottom:0}
.steps li:last-child::after{display:none}
.steps b{font-family:var(--font-serif);font-size:15px;color:var(--ink)}
.steps span{font-size:12.5px;color:var(--ink-3);line-height:1.6}
.route-tip{
  margin-top:14px;padding:12px 14px;font-size:12.5px;color:var(--ink-2);
  background:rgba(185,148,87,.10);border-left:3px solid var(--gold);border-radius:0 var(--r) var(--r) 0;
}

/* ---------- 墓葬卡 ---------- */
.tomb-list{display:flex;flex-direction:column;gap:16px}
.tomb-card{background:#FFFDF7;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;box-shadow:var(--shadow)}
.tomb-media{height:172px}
.tomb-media img{height:172px}
.tomb-tag{
  position:absolute;left:0;bottom:0;z-index:3;padding:5px 10px;
  font-size:11px;letter-spacing:.04em;background:rgba(27,24,21,.78);color:#F0E8D8;border-radius:0 2px 0 0;
}
.tomb-body{padding:16px}
.tomb-body h3{font-size:19px;letter-spacing:.06em;margin-bottom:3px}
.tomb-meta{font-size:12px;color:var(--cinnabar);margin-bottom:10px}
.tomb-body p{font-size:13.5px;color:var(--ink-2)}
.tomb-watch{
  margin-top:10px;margin-bottom:0!important;padding:10px 12px;
  background:var(--paper-2);border-radius:var(--r);font-size:12.5px!important;color:var(--ink-2)!important;
}
.tomb-watch b{color:var(--cinnabar);margin-right:4px}

/* ---------- 提示卡 ---------- */
.tip-grid{display:grid;grid-template-columns:1fr;gap:10px}
.tip-card{
  padding:14px 16px;background:#FFFDF7;border:1px solid var(--line);
  border-left:3px solid var(--jade);border-radius:0 var(--r) var(--r) 0;
}
.tip-card h4{font-size:14.5px;margin-bottom:5px;letter-spacing:.04em}
.tip-card p{font-size:12.5px;color:var(--ink-3);margin:0;line-height:1.7}

/* ---------- 正文 / 时间轴 ---------- */
.prose p{font-size:14px;color:var(--ink-2);line-height:1.85}
.timeline{position:relative;margin:18px 0 6px;padding-left:22px}
.timeline::before{
  content:"";position:absolute;left:5px;top:6px;bottom:6px;width:1px;
  background:linear-gradient(180deg,var(--cinnabar),var(--line-2) 18%,var(--line) 82%,transparent);
}
.tl-item{position:relative;padding-bottom:20px}
.tl-item:last-child{padding-bottom:0}
.tl-dot{
  position:absolute;left:-22px;top:6px;width:11px;height:11px;border-radius:50%;
  background:var(--paper);border:2px solid var(--cinnabar);
}
.tl-body b{display:block;font-family:var(--font-serif);font-size:14.5px;color:var(--cinnabar);letter-spacing:.03em;margin-bottom:2px}
.tl-body p{font-size:13px;color:var(--ink-2);margin:0;line-height:1.7}

/* ---------- 世系图谱 ---------- */
.lineage{padding:18px 12px;background:#FFFDF7;border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow)}
.lin-root{display:flex;justify-content:center}
.lin-branch{width:1px;height:16px;margin:0 auto;background:var(--line-2)}
.lin-row{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-bottom:2px}
.lin-node{
  flex:1 1 30%;min-width:88px;max-width:150px;padding:9px 6px;text-align:center;
  background:var(--paper-2);border:1px solid var(--line);border-radius:var(--r);
}
.lin-node b{display:block;font-family:var(--font-serif);font-size:13.5px;color:var(--ink);letter-spacing:.04em}
.lin-node i{display:block;font-style:normal;font-size:10.5px;color:var(--ink-4);margin-top:1px}
.lin-node.root{
  background:linear-gradient(180deg,var(--cinnabar),#8E241F);border-color:var(--cinnabar);
  padding:11px 22px;box-shadow:0 4px 16px rgba(163,43,37,.24);
}
.lin-node.root b{color:#FBF6EC}
.lin-node.root i{color:rgba(251,246,236,.72)}
.lin-node.hl{background:linear-gradient(180deg,#FBEEDC,#F5E2C4);border-color:var(--gold)}
.lin-node.hl b{color:var(--cinnabar)}
.note-card{
  margin-top:16px;padding:14px 16px;
  background:rgba(93,115,100,.07);border-left:3px solid var(--jade);border-radius:0 var(--r) var(--r) 0;
}
.note-card b{display:block;font-family:var(--font-serif);font-size:13.5px;color:var(--jade);margin-bottom:4px}
.note-card p{font-size:12.5px;color:var(--ink-2);margin:0;line-height:1.75}

/* ---------- 建筑科普 ---------- */
.arch-compare{display:grid;grid-template-columns:1fr;gap:10px;margin-top:14px}
.arch-item{padding:14px 16px;background:#FFFDF7;border:1px solid var(--line);border-radius:var(--r)}
.arch-item h4{font-size:14.5px;margin-bottom:5px;color:var(--cinnabar);letter-spacing:.04em}
.arch-item p{font-size:12.5px;color:var(--ink-3);margin:0;line-height:1.75}
.diagram-card{margin-top:16px;padding:16px;background:#FFFDF7;border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow)}
.diagram-card h4{font-size:14px;margin-bottom:14px;letter-spacing:.04em}
.diagram{display:flex;align-items:flex-end;gap:6px;height:120px}
.dg-seg{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;gap:5px;height:100%}
.dg-bar{width:100%;border-radius:1px 1px 0 0;background:linear-gradient(180deg,var(--cinnabar),#7E1F1B);opacity:.86}
.dg-bar.b1{height:34%}
.dg-bar.b2{height:56%}
.dg-bar.b3{height:82%}
.dg-bar.b4{height:100%;background:linear-gradient(180deg,var(--gold),#96773E)}
.dg-seg b{font-family:var(--font-serif);font-size:12.5px;color:var(--ink)}
.dg-seg i{font-style:normal;font-size:10px;color:var(--ink-4)}
.diagram-note{margin-top:12px;font-size:11.5px;color:var(--ink-4);line-height:1.65}

/* ---------- 画册 ---------- */
.gallery{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.gal-item{margin:0;background:#FFFDF7;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;cursor:pointer}
.gal-item .media{height:118px}
.gal-item .media img{height:118px}
.gal-item figcaption{padding:8px 10px}
.gal-item figcaption b{display:block;font-family:var(--font-serif);font-size:12.5px;color:var(--ink);margin-bottom:1px}
.gal-item figcaption span{display:block;font-size:10.5px;color:var(--ink-4);line-height:1.5}

/* 碑刻两联 */
.stele-pair{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.stele-media{height:130px}
.stele-media img{height:130px}

/* ---------- 重点文物 ---------- */
.relic-list{display:flex;flex-direction:column;gap:10px}
.relic{display:flex;gap:12px;padding:14px 16px;background:#FFFDF7;border:1px solid var(--line);border-radius:var(--r)}
.relic-no{
  flex:0 0 auto;width:26px;height:26px;display:grid;place-items:center;
  font-family:var(--font-serif);font-size:13px;color:#FBF6EC;background:var(--cinnabar);border-radius:2px;
}
.relic h4{font-size:14.5px;margin-bottom:4px;letter-spacing:.04em}
.relic p{font-size:12.5px;color:var(--ink-3);margin:0;line-height:1.75}

/* ---------- 小知识 ---------- */
.know-list{display:flex;flex-direction:column;gap:8px}
.know{background:#FFFDF7;border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.know summary{
  padding:13px 16px 13px 38px;position:relative;cursor:pointer;list-style:none;
  font-family:var(--font-serif);font-size:14px;color:var(--ink);letter-spacing:.02em;
}
.know summary::-webkit-details-marker{display:none}
.know summary::before{
  content:"?";position:absolute;left:14px;top:50%;translate:0 -50%;
  width:17px;height:17px;display:grid;place-items:center;font-size:11px;font-family:var(--font-sans);
  color:var(--cinnabar);border:1px solid rgba(163,43,37,.42);border-radius:50%;
}
.know summary::after{content:"＋";position:absolute;right:16px;top:50%;translate:0 -50%;font-size:13px;color:var(--ink-4)}
.know[open] summary::after{content:"－"}
.know p{padding:0 16px 14px 38px;margin:0;font-size:12.5px;color:var(--ink-3);line-height:1.8}

/* ---------- 底部导航 ---------- */
.tabbar{
  position:fixed;left:0;right:0;bottom:0;z-index:60;display:flex;
  height:calc(var(--tabbar-h) + env(safe-area-inset-bottom));
  padding-bottom:env(safe-area-inset-bottom);
  background:rgba(247,242,231,.92);
  backdrop-filter:saturate(160%) blur(14px);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
  border-top:1px solid rgba(201,185,143,.6);
}
.tab{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  color:var(--ink-4);font-size:10.5px;letter-spacing:.06em;transition:color .18s;
}
.tab svg{width:20px;height:20px}
.tab.is-on{color:var(--cinnabar)}
.tab.is-on svg{transform:translateY(-1px)}

/* ---------- 弹层 ---------- */
.sheet{position:fixed;inset:0;z-index:100;display:flex;align-items:flex-end;justify-content:center}
.sheet[hidden]{display:none}
.sheet-mask{position:absolute;inset:0;background:rgba(20,17,13,.52);animation:fade .2s ease both}
.sheet-panel{
  position:relative;z-index:1;width:100%;max-width:560px;max-height:82svh;overflow-y:auto;
  background:var(--paper);border-radius:12px 12px 0 0;
  box-shadow:0 -8px 40px rgba(0,0,0,.28);animation:up .26s cubic-bezier(.22,.8,.3,1) both;
  padding:22px var(--pad) calc(26px + env(safe-area-inset-bottom));
}
@keyframes up{from{transform:translateY(28px);opacity:.6}to{transform:translateY(0);opacity:1}}
.sheet-x{
  position:absolute;right:12px;top:10px;z-index:2;width:32px;height:32px;
  display:grid;place-items:center;font-size:15px;color:var(--ink-3);
  background:rgba(232,222,198,.7);border-radius:50%;
}
.sheet-inner h3{font-size:19px;letter-spacing:.06em;margin-bottom:4px;padding-right:36px}
.sheet-inner .sh-meta{font-size:12px;color:var(--cinnabar);margin-bottom:12px}
.sheet-inner p{font-size:13.5px;color:var(--ink-2);line-height:1.8}
.sheet-inner .sh-tag{
  display:inline-block;padding:3px 9px;margin:0 6px 8px 0;font-size:11px;
  color:var(--ink-3);background:var(--paper-2);border:1px solid var(--line);border-radius:2px;
}
.sheet-inner ul.sh-list{margin:10px 0 0;padding:0}
.sheet-inner ul.sh-list li{position:relative;padding-left:15px;font-size:13px;color:var(--ink-2);line-height:1.8}
.sheet-inner ul.sh-list li::before{
  content:"";position:absolute;left:0;top:.72em;width:5px;height:5px;border-radius:50%;background:var(--gold);
}
.sheet-inner .sh-img{width:100%;border-radius:var(--r);margin-bottom:12px;background:var(--paper-3)}
.sheet-inner .sh-cap{font-size:12px;color:var(--ink-4);text-align:center;margin-top:8px}

/* ---------- 响应式 ---------- */
@media (min-width:640px){
  :root{--pad:24px}
  body{font-size:15.5px}
  .entry-grid{grid-template-columns:repeat(4,1fr)}
  .entry{padding:18px 14px}
  .entry b{font-size:15px}
  .tip-grid{grid-template-columns:1fr 1fr}
  .arch-compare{grid-template-columns:1fr 1fr}
  .gallery{grid-template-columns:repeat(4,1fr)}
  .gal-item .media{height:140px}
  .gal-item .media img{height:140px}
  .tomb-card{display:grid;grid-template-columns:240px 1fr}
  .tomb-media{height:100%}
  .tomb-media img{height:100%}
  .hero{padding-bottom:56px}
  .hero-seal{width:62px;height:62px;font-size:20px;bottom:60px}
  .sheet-panel{border-radius:12px;margin-bottom:6vh;max-height:76vh}
}
@media (min-width:900px){
  .hero-title{font-size:66px}
  .wrap{padding-bottom:56px}
}

/* ---------- 无障碍 / 省流 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .hero-scroll span{animation:none;opacity:.8}
}
@media (prefers-contrast:more){
  body{--line:#9A8E7E;--line-2:#7A6E5C}
}