:root{
  --paper:#F5F2EA; --card:#FCFAF3; --ink:#26241E; --brick:#B0202A;
  --ochre:#D9822B; --navy:#2E5A78; --sage:#77813F; --grey:#8A8474; --line:#D9D2BF;
  --serif:"Noto Serif SC","Songti SC","STSong","SimSun",serif;
  --sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"Noto Sans Mono","SFMono-Regular",Consolas,monospace;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.65}
a{color:var(--brick);text-decoration:none}
a:hover{text-decoration:underline}

/* header */
.site-header{display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:12px 28px;background:var(--card);border-bottom:3px solid var(--brick);flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:14px}
.brand-mark{width:52px;height:52px;display:block}
.brand-name{font-family:var(--serif);font-weight:700;font-size:27px;letter-spacing:.04em;line-height:1.1}
.brand-name span{color:var(--brick)}
.brand-sub{font-size:12.5px;color:var(--grey);letter-spacing:.08em}
.site-nav{display:flex;gap:30px;flex-wrap:wrap}
.site-nav a{color:var(--ink);font-size:16px;padding:2px 1px}
.site-nav a.active{color:var(--brick);font-weight:700;border-bottom:3px solid var(--brick)}

/* map layout */
.map-section{padding:18px 22px 6px}
.map-layout{display:flex;gap:16px;align-items:stretch}
.panel{width:302px;flex:0 0 302px;background:var(--card);border:1px solid var(--line);
  border-radius:10px;padding:18px 18px 14px;display:flex;flex-direction:column}
.panel-head h2{font-family:var(--serif);font-size:22px;margin:0 0 10px}
.panel-head .en{font-family:var(--mono);font-size:12px;color:var(--grey);letter-spacing:.12em}
.search-box input{width:100%;padding:9px 12px;border:1px solid var(--line);border-radius:8px;
  background:#fff;font-size:14px;font-family:var(--sans);color:var(--ink)}
.search-box input:focus{outline:2px solid var(--brick);outline-offset:0}
.layer-list{list-style:none;margin:14px 0 6px;padding:0}
.layer-list li{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px dotted var(--line)}
.layer-list li:last-child{border-bottom:none}
.layer-list .dot{width:11px;height:11px;border-radius:50%;flex:0 0 11px}
.layer-meta{flex:1;min-width:0}
.layer-meta strong{display:block;font-size:15.5px;line-height:1.25}
.layer-meta small{color:var(--grey);font-size:12px;line-height:1.3;display:block}
.switch{position:relative;display:inline-block;width:46px;height:24px;flex:0 0 46px}
.switch input{opacity:0;width:0;height:0}
.switch span{position:absolute;inset:0;background:#CFC9B8;border-radius:24px;cursor:pointer;transition:.2s}
.switch span:before{content:"";position:absolute;width:18px;height:18px;border-radius:50%;
  background:#fff;top:3px;left:3px;transition:.2s}
.switch input:checked + span{background:var(--brick)}
.switch input:checked + span:before{transform:translateX(22px)}
.legend{margin-top:10px;border-top:1px solid var(--line);padding-top:10px}
.legend h3{font-family:var(--serif);font-size:15px;margin:0 0 6px}
.legend p{margin:4px 0;font-size:12.5px;color:#55503F;display:flex;align-items:center;gap:8px}
.lg{width:12px;height:12px;display:inline-block;flex:0 0 12px}
.lg-node{background:var(--brick);border-radius:50%;border:1.5px solid #fff;box-shadow:0 0 0 1px var(--line)}
.lg-hash{background:rgba(217,130,43,.55)}
.lg-mine{background:#A85E14}
.lg-ln{background:var(--navy);transform:rotate(45deg) scale(.8)}
.snapshot-note{margin-top:auto;padding-top:12px;font-size:12px;color:var(--grey);line-height:1.55}

.map-wrap{position:relative;flex:1;min-width:0;border:1px solid #B7AD93;border-radius:4px;overflow:hidden;background:#EFE9D8}
#map{position:absolute;inset:0}
.maplibregl-ctrl-attrib{font-size:10px;background:rgba(252,250,243,.75)}
.map-tagline{position:absolute;left:22px;top:18px;z-index:5;pointer-events:none;
  background:rgba(245,242,234,.82);padding:10px 16px 8px;border-left:4px solid var(--brick);border-radius:2px}
.map-tagline h1{font-family:var(--serif);font-size:23px;line-height:1.45;margin:0;font-weight:700}
.map-tagline .accent{color:var(--brick)}
.map-foot{position:absolute;right:12px;bottom:8px;z-index:5;font-family:var(--mono);
  font-size:11.5px;color:#6E6852;display:flex;gap:16px;pointer-events:none}
.map-watermark{font-family:var(--sans)}

/* dossier */
.dossier{position:absolute;right:18px;bottom:44px;z-index:6;width:340px;background:var(--card);
  border:1px solid var(--line);border-top:5px solid var(--brick);border-radius:6px;
  padding:16px 20px 12px;box-shadow:0 8px 28px rgba(38,36,30,.16)}
.dossier-close{position:absolute;top:6px;right:10px;border:none;background:none;font-size:22px;
  color:var(--grey);cursor:pointer;line-height:1}
.dossier-kicker{font-size:11.5px;color:var(--brick);font-weight:700;letter-spacing:.14em}
.dossier-name{font-family:var(--serif);font-size:27px;margin:4px 0 8px}
.dossier-name small{font-size:15px;color:var(--grey);font-family:var(--serif)}
.dossier-rows{margin:0}
.dossier-rows div{display:flex;justify-content:space-between;align-items:baseline;
  padding:5px 0;border-bottom:1px dotted var(--line)}
.dossier-rows dt{color:var(--grey);font-size:13.5px}
.dossier-rows dd{margin:0;font-family:var(--mono);font-weight:700;font-size:15.5px}
.dossier-note{font-size:12px;color:var(--grey);margin:9px 0 2px;line-height:1.55}

/* timeline */
.timeline{display:flex;align-items:center;gap:14px;padding:12px 4px 4px;flex-wrap:wrap}
.play-btn{width:34px;height:34px;border-radius:50%;border:2px solid var(--brick);background:var(--card);
  color:var(--brick);font-size:13px;cursor:pointer;flex:0 0 34px}
.play-btn:hover{background:var(--brick);color:#fff}
.tl-year{font-family:var(--serif);font-weight:700;font-size:21px;color:var(--brick);min-width:52px}
.timeline input[type=range]{flex:1;min-width:180px;accent-color:var(--brick)}
.tl-note{font-size:13px;color:var(--grey)}

/* lower sections */
.strip{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;padding:26px 28px 4px}
.strip article{border-top:3px solid var(--brick);padding-top:10px}
.strip h3{font-family:var(--serif);font-size:19px;margin:0 0 6px}
.strip p{margin:0;color:#55503F;font-size:14px}
.essay{max-width:860px;margin:0 auto;padding:22px 28px 2px}
.essay h2{font-family:var(--serif);font-size:23px;border-bottom:1px solid var(--line);padding-bottom:8px}
.essay p{color:#3B382C}
.method-list{color:#3B382C;padding-left:20px}
.method-list li{margin:7px 0}
.site-footer{margin-top:34px;border-top:1px solid var(--line);padding:16px 28px 26px;
  font-family:var(--mono);font-size:12.5px;color:var(--grey)}
.site-footer .fine{font-family:var(--sans);max-width:900px}

/* popup */
.maplibregl-popup-content{font-family:var(--sans);border-radius:6px;border-top:4px solid var(--brick);padding:10px 14px}
.maplibregl-popup-content strong{font-family:var(--serif)}
.maplibregl-popup-content .pp-sub{color:var(--grey);font-size:12px}

/* responsive: keep the map dominant, panel folds above it */
@media (max-width:900px){
  .map-layout{flex-direction:column}
  .panel{width:auto;flex:none}
  .map-wrap{height:62vh;min-height:420px}
  .strip{grid-template-columns:1fr}
  .site-nav{gap:16px}
  .dossier{left:12px;right:12px;width:auto}
  .map-tagline h1{font-size:18px}
}
@media (min-width:901px){
  .map-wrap{height:calc(100vh - 250px);min-height:560px}
}

/* ===== v2: one-screen app homepage / doc pages / map tip ===== */
html,body{height:100%}
body.app{display:flex;flex-direction:column;height:100dvh;overflow:hidden}
body.app .site-header{flex:0 0 auto}
.app-main{flex:1;min-height:0;display:flex}
body.app .map-section{flex:1;min-height:0;display:flex;flex-direction:column;padding:12px 16px 8px}
body.app .map-layout{flex:1;min-height:0}
body.app .map-wrap{height:auto;min-height:0}
body.app .panel{overflow-y:auto}
body.app .timeline{flex:0 0 auto;padding-bottom:2px}
.doc-main{padding-bottom:8px}
.doc-strip{padding:10px 28px 0}
.map-tip{position:absolute;z-index:7;pointer-events:none;background:rgba(38,36,30,.93);color:#F5F2EA;
  font-size:12.5px;padding:5px 10px;border-radius:4px;white-space:nowrap;transform:translate(14px,16px)}
.map-hint{position:absolute;left:50%;transform:translateX(-50%);bottom:28px;z-index:5;pointer-events:none;
  background:rgba(252,250,243,.88);border:1px solid var(--line);border-radius:20px;padding:4px 14px;
  font-size:12px;color:#6E6852;white-space:nowrap}
@media (max-width:900px){
  body.app .map-layout{flex-direction:column}
  body.app .panel{width:auto;flex:0 1 auto;max-height:42%;overflow-y:auto}
  body.app .map-wrap{height:auto;min-height:0;flex:1}
  .map-hint{display:none}
}

/* ===== v3: full-bleed map, glass overlays, zero scrollbars ===== */
html,body{overflow:hidden}
::-webkit-scrollbar{width:0;height:0}
*{scrollbar-width:none}
body{display:flex;flex-direction:column;height:100dvh}
.glass{background:rgba(252,250,243,.78);backdrop-filter:blur(14px) saturate(1.3);
  -webkit-backdrop-filter:blur(14px) saturate(1.3);
  border:1px solid rgba(176,32,42,.18);box-shadow:0 12px 32px rgba(38,36,30,.16)}
.site-header{padding:8px 22px;flex:0 0 auto}
.brand-mark{width:42px;height:42px}
.brand-name{font-size:23px}
.brand-sub{font-size:11.5px}
.site-nav a{font-size:15px;letter-spacing:.05em}
.app-main{flex:1;min-height:0;display:flex}
.map-wrap{flex:1;min-height:0;border:none;border-radius:0;background:#EFE9D8}

/* floating layer panel on the map */
.panel{position:absolute;left:16px;top:16px;z-index:8;width:302px;
  max-height:calc(100% - 110px);overflow:hidden;border-radius:14px;padding:14px 16px 12px}
.panel-head{display:flex;align-items:flex-start;justify-content:space-between}
.panel-head h2{margin:0 0 8px}
.panel-close{border:none;background:none;font-size:24px;line-height:1;color:var(--grey);
  cursor:pointer;padding:0 2px}
.panel-close:hover{color:var(--brick)}
.layers-open-btn{position:absolute;left:16px;top:16px;z-index:8;display:none;
  font-family:var(--sans);font-size:14px;font-weight:700;color:var(--ink);
  border-radius:10px;padding:9px 16px;cursor:pointer}
.map-wrap.panel-collapsed .panel{display:none}
.map-wrap.panel-collapsed .layers-open-btn{display:inline-block}
.map-wrap.panel-collapsed .map-tagline{left:128px}
.map-wrap.panel-collapsed .timeline{left:16px}

.map-tagline{left:334px;top:16px;border-left:4px solid var(--brick);border-radius:8px}
.timeline{position:absolute;left:334px;right:16px;bottom:14px;z-index:6;
  border-radius:12px;padding:8px 14px;flex-wrap:nowrap}
.tl-note{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tl-hint{font-size:12px;color:#6E6852;white-space:nowrap}
.tl-coords{margin-left:auto;font-family:var(--mono);font-size:11.5px;color:#6E6852;white-space:nowrap}
.dossier{bottom:76px;border-top:5px solid var(--brick)}
.map-foot{display:none}
.map-hint{display:none}

/* doc pages: one screen, compact grid */
.doc-main{flex:1;min-height:0;display:flex;flex-direction:column}
.atlas-main{padding:14px 22px 4px;gap:14px}
.atlas-top{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;flex:0 0 auto}
.atlas-cols{flex:1;min-height:0;display:grid;grid-template-columns:1fr 1.25fr;gap:20px}
.doc-card{background:var(--card);border:1px solid var(--line);border-top:3px solid var(--brick);
  border-radius:10px;padding:12px 18px 10px;overflow:hidden}
.doc-card h3{font-family:var(--serif);font-size:18px;margin:0 0 5px}
.doc-card p{margin:0;color:#55503F;font-size:13.5px;line-height:1.6}
.atlas-cols .essay{max-width:none;margin:0}
.atlas-cols .essay h2{font-size:20px;margin:0 0 8px;padding-bottom:6px}
.atlas-cols .essay p{font-size:14px;color:#3B382C;margin:0 0 8px}
.atlas-cols .method-list{font-size:13.5px;line-height:1.6;margin:0}
.atlas-cols .method-list li{margin:5px 0}
.about-main{align-items:center;justify-content:center;padding:14px 22px}
.about-card{max-width:820px;width:100%}
.about-card h2{font-size:21px;margin:0 0 8px;border-bottom:1px solid var(--line);padding-bottom:7px}
.about-card p{font-size:14.5px;color:#3B382C;margin:0 0 8px}
.site-footer{flex:0 0 auto;margin-top:0;padding:10px 22px 12px}

/* short screens: compact the panel instead of scrolling it */
@media (max-height:820px){
  .legend{display:none}
  .layer-list li{padding:6px 0}
  .snapshot-note{padding-top:8px}
}
@media (max-width:1250px){ .tl-hint{display:none} }
@media (max-width:900px){
  .panel{width:calc(100% - 32px);max-height:52%}
  .map-tagline{display:none}
  .timeline{left:16px}
  .tl-note{display:none}
  .atlas-top{grid-template-columns:1fr}
  .atlas-cols{grid-template-columns:1fr}
  .dossier{bottom:70px}
}

/* v3.1 mobile compaction */
@media (max-width:900px){
  .panel .legend,.panel .snapshot-note{display:none}
  .panel .layer-meta small{display:none}
  .panel .layer-list li{padding:7px 0}
  .panel{max-height:64%}
  .site-footer .fine{display:none}
  .atlas-main{padding:10px 12px 2px;gap:10px}
  .atlas-top{gap:10px}
  .atlas-cols{gap:10px}
  .doc-card{padding:10px 12px 8px}
  .doc-card p{font-size:12.5px;line-height:1.55}
  .atlas-cols .essay h2{font-size:17px}
  .atlas-cols .essay p{font-size:12.5px;line-height:1.55}
  .atlas-cols .method-list{font-size:12px;line-height:1.5}
}

/* v3.2 specificity fixes + phone layout (multi-column kept, compact type) */
@media (max-width:900px){
  body.app .panel{max-height:66%;overflow:hidden}
  .site-header{padding:6px 14px;gap:10px}
  .brand-sub{display:none}
  .brand-name{font-size:20px}
  .brand-mark{width:34px;height:34px}
  .site-nav{gap:14px}
  .atlas-top{grid-template-columns:repeat(3,1fr)}
  .atlas-cols{grid-template-columns:1fr 1.25fr}
  .doc-card h3{font-size:14px}
  .doc-card p{font-size:11.5px;line-height:1.5}
  .atlas-cols .essay h2{font-size:15px}
  .atlas-cols .essay p{font-size:11.5px;line-height:1.5}
  .atlas-cols .method-list{font-size:11px;line-height:1.45}
  .atlas-cols .method-list li{margin:3px 0}
}
@media (max-width:900px){
  .atlas-main{padding-top:8px;gap:8px}
  .atlas-cols .method-list li{margin:2px 0}
  .atlas-cols .essay h2{margin-bottom:5px;padding-bottom:4px}
}

/* v3.3: larger hit area for the panel close button */
.panel-close{padding:7px 9px;margin:-5px -4px 0 0;font-size:26px}

/* ===== v4: Bitcoin GIS name, no red header rule, glass controls, drill UI, doc nameplates ===== */
.site-header{border-bottom:1px solid var(--line)}
.lg-lnc{background:var(--navy);border-radius:50%;border:1.5px solid #fff;box-shadow:0 0 0 1px var(--line)}

/* breadcrumb */
.crumbs{position:absolute;top:16px;left:50%;transform:translateX(-50%);z-index:7;
  display:flex;align-items:center;gap:2px;padding:6px 12px;border-radius:999px;font-size:13.5px}
.crumbs[hidden]{display:none}
.crumbs button{border:none;background:none;font:inherit;cursor:pointer;color:var(--ink);
  padding:2px 7px;border-radius:999px;white-space:nowrap}
.crumbs button:hover{background:rgba(176,32,42,.10)}
.crumbs button.cur{color:var(--brick);font-weight:700}
.crumbs .sep{color:var(--grey)}

/* city labels at drill level 2 */
.city-label{font-family:var(--sans);font-size:12px;background:rgba(252,250,243,.92);
  border:1px solid rgba(176,32,42,.40);border-radius:999px;padding:2px 9px;color:var(--ink);
  white-space:nowrap;box-shadow:0 3px 10px rgba(38,36,30,.18);pointer-events:none}
.city-label b{color:var(--brick);font-family:var(--mono);font-weight:700}

/* timeline bar redesign */
.timeline{border-radius:16px;padding:10px 16px;gap:12px}
.play-btn{width:37px;height:37px;flex:0 0 37px;background:var(--brick);border:none;color:#fff;
  font-size:14px;box-shadow:0 4px 12px rgba(176,32,42,.35)}
.play-btn:hover{background:#8F1A23;color:#fff}
.tl-year{font-size:22px}
.timeline input[type=range]{-webkit-appearance:none;appearance:none;height:5px;border-radius:3px;
  background:linear-gradient(90deg,#D9822B,#B0202A);outline:none;cursor:pointer}
.timeline input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:17px;height:17px;
  border-radius:50%;background:#FCFAF3;border:2.5px solid var(--brick);
  box-shadow:0 1px 6px rgba(38,36,30,.30);cursor:pointer}
.timeline input[type=range]::-moz-range-thumb{width:15px;height:15px;border-radius:50%;
  background:#FCFAF3;border:2.5px solid var(--brick);box-shadow:0 1px 6px rgba(38,36,30,.30);cursor:pointer}
.timeline input[type=range]::-moz-range-track{height:5px;border-radius:3px;
  background:linear-gradient(90deg,#D9822B,#B0202A)}

/* maplibre controls: same glass language */
.maplibregl-ctrl-group{background:rgba(252,250,243,.82)!important;
  backdrop-filter:blur(12px) saturate(1.3);-webkit-backdrop-filter:blur(12px) saturate(1.3);
  border:1px solid rgba(176,32,42,.18);border-radius:12px!important;
  box-shadow:0 10px 26px rgba(38,36,30,.16)!important;overflow:hidden}
.maplibregl-ctrl-group button{background:transparent!important;width:32px!important;height:32px!important}
.maplibregl-ctrl-group button:hover{background:rgba(176,32,42,.08)!important}
.maplibregl-ctrl-scale{background:rgba(252,250,243,.78);backdrop-filter:blur(10px);
  border:1px solid rgba(138,132,116,.55);border-radius:6px;font-family:var(--mono);
  font-size:10.5px;color:#55503F;line-height:1.6;padding:0 5px}
.maplibregl-ctrl-attrib{background:rgba(252,250,243,.55)!important;backdrop-filter:blur(8px)}

/* dossier: dynamic rows */
.dossier{width:362px}
.dossier-rows dt{white-space:nowrap}
.dossier-rows dd{font-size:14px;text-align:right}

/* doc pages: academic-archive nameplate + rectangular frames */
.atlas-main{padding:16px 26px 6px;gap:12px}
.doc-head{display:flex;justify-content:space-between;align-items:flex-end;gap:20px}
.doc-title{font-family:var(--serif);font-size:32px;line-height:1.15;margin:0;font-weight:700}
.doc-title-en{font-family:var(--mono);font-size:11px;letter-spacing:.22em;color:var(--grey);margin-top:4px}
.doc-head-note{font-family:var(--serif);font-size:13.5px;color:var(--grey);padding-bottom:4px}
.rule-thick{height:3px;background:var(--brick)}
.rule-thin{height:1px;background:var(--ink);opacity:.5;margin-top:2px}
.frame{background:#FCFAF3;border:1px solid #B7AD93;border-radius:2px;padding:14px 18px 12px;overflow:hidden}
.frame h3{font-family:var(--serif);font-size:18px;margin:0 0 6px}
.frame .fnum{color:var(--brick);margin-right:9px}
.frame p{font-size:13.5px;line-height:1.65;color:#3B382C;margin:0}
.essay-frame h2{font-family:var(--serif);font-size:20px;margin:0 0 8px;padding-bottom:6px;border-bottom:1px solid var(--line)}
.essay-frame p{margin:0 0 8px}
.essay-frame p:last-child{margin-bottom:0}
.frame .method-list{list-style:none;padding:0;margin:0}
.frame .method-list li{border-bottom:1px dotted var(--line);padding:6px 0;margin:0;font-size:13.5px;line-height:1.6}
.frame .method-list li:last-child{border-bottom:none}
.frame .method-list strong{color:var(--brick)}
.about-wrap{width:min(800px,94vw);display:flex;flex-direction:column;gap:14px}
.quote-frame{text-align:center;padding:24px 20px 18px}
.quote-text{font-family:var(--serif);font-size:25px;line-height:1.6;font-weight:700;margin:0}
.quote-text .accent{color:var(--brick)}
.quote-note{color:var(--grey);font-size:12.5px;margin-top:9px}
@media (max-height:820px){
  .doc-title{font-size:26px}
  .frame p,.frame .method-list li{font-size:12.5px}
  .quote-text{font-size:21px}
}
@media (max-width:900px){
  .doc-head-note{display:none}
  .quote-text{font-size:20px}
  .crumbs{max-width:94vw;overflow:hidden}
  .dossier{width:auto}
}

/* v4.1 short-screen doc compaction */
@media (max-height:820px){
  .atlas-main{gap:9px;padding-top:10px}
  .frame{padding:11px 15px 9px}
  .frame .method-list li{padding:4px 0;line-height:1.5;font-size:12px}
  .essay-frame p{font-size:12.5px;line-height:1.55}
  .frame p{line-height:1.55}
  .essay-frame h2{font-size:18px;margin-bottom:6px}
}