/* ============ 数字西湖 · 3D 交互全景  ============ */
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%;margin:0;overflow:hidden}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);background:#dfe9f2;
  -webkit-font-smoothing:antialiased;
}
:root{
  --ink:#12242f; --ink2:#4d6273; --ink3:#8799a6;
  --accent:#0e7f92; --accent2:#c2553f;
  --panel:rgba(255,255,255,.82);
  --panel-solid:rgba(255,255,255,.96);
  --line:rgba(18,36,47,.10);
  --shadow:0 8px 30px rgba(18,40,60,.14),0 1px 3px rgba(18,40,60,.08);
  --serif:"Songti SC","STSong","Source Han Serif SC","Noto Serif SC",serif;
  --r:14px;
}
#stage{position:fixed;inset:0}
#stage canvas{display:block;width:100%;height:100%}
.hide{display:none!important}

/* ---------- 品牌卡 ---------- */
#brand{
  position:fixed;left:18px;top:18px;z-index:30;
  padding:14px 18px 13px;border-radius:var(--r);
  background:var(--panel);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid var(--line);box-shadow:var(--shadow);
  min-width:212px;
}
#brand h1{
  margin:0;font-family:var(--serif);font-size:23px;letter-spacing:.22em;
  font-weight:600;color:var(--ink);text-indent:.22em;
}
#brand .sub{
  margin-top:5px;font-size:10.5px;letter-spacing:.14em;color:var(--ink3);
  text-transform:uppercase;
}
#brand .cn{margin-top:7px;font-size:11.5px;color:var(--ink2);letter-spacing:.04em}
#brand .cn b{color:var(--accent);font-weight:600}

/* ---------- 侧栏 ---------- */
#sidebar{
  position:fixed;left:18px;top:132px;bottom:120px;width:212px;z-index:30;
  display:flex;flex-direction:column;gap:8px;
}
#search{
  display:flex;align-items:center;gap:7px;padding:8px 11px;border-radius:11px;
  background:var(--panel);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid var(--line);box-shadow:var(--shadow);
}
#search input{
  border:0;background:transparent;outline:none;font-size:12.5px;color:var(--ink);
  width:100%;font-family:inherit;
}
#search input::placeholder{color:var(--ink3)}
#search svg{flex:0 0 auto;opacity:.45}

#list{
  flex:1;overflow-y:auto;overflow-x:hidden;padding:2px 3px 2px 0;
  scrollbar-width:thin;scrollbar-color:rgba(18,36,47,.18) transparent;
}
#list::-webkit-scrollbar{width:6px}
#list::-webkit-scrollbar-thumb{background:rgba(18,36,47,.16);border-radius:3px}
.grp{
  font-size:10.5px;letter-spacing:.16em;color:var(--ink3);margin:12px 0 6px 8px;
  display:flex;align-items:center;gap:6px;
}
.grp:first-child{margin-top:2px}
.grp:after{content:"";flex:1;height:1px;background:var(--line)}
.item{
  display:flex;align-items:center;gap:9px;padding:7px 9px;border-radius:10px;
  cursor:pointer;transition:background .16s,transform .16s;
  background:rgba(255,255,255,.62);border:1px solid transparent;margin-bottom:4px;
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
}
.item:hover{background:#fff;border-color:var(--line);transform:translateX(2px)}
.item.on{background:#fff;border-color:rgba(14,127,146,.42);box-shadow:0 3px 12px rgba(14,127,146,.16)}
.item .dot{
  width:7px;height:7px;border-radius:50%;flex:0 0 auto;
  box-shadow:0 0 0 3px rgba(0,0,0,.05);
}
.item .nm{font-size:12.5px;color:var(--ink);flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.item .en{font-size:9px;color:var(--ink3);letter-spacing:.03em;max-width:0;overflow:hidden;opacity:0;transition:.2s}
.item em{font-style:normal;font-size:10px;color:var(--ink3)}

/* ---------- 工具条 ---------- */
#tools{
  position:fixed;right:18px;top:18px;z-index:30;display:flex;flex-direction:column;gap:8px;align-items:flex-end;
}
.tbtn{
  display:flex;align-items:center;gap:8px;padding:9px 13px;border-radius:11px;cursor:pointer;
  background:var(--panel);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid var(--line);box-shadow:var(--shadow);
  font-size:12px;color:var(--ink2);letter-spacing:.02em;user-select:none;
  transition:.16s;
}
.tbtn:hover{background:#fff;color:var(--ink)}
.tbtn.on{background:rgba(14,127,146,.10);border-color:rgba(14,127,146,.4);color:var(--accent)}
.tbtn i{
  width:14px;height:14px;display:block;border-radius:4px;border:1.5px solid currentColor;opacity:.5;
  position:relative;
}
.tbtn.on i{background:currentColor;box-shadow:inset 0 0 0 2.5px #fff}
.tbtn .kbd{
  font-size:9.5px;color:var(--ink3);border:1px solid var(--line);border-radius:4px;
  padding:0 4px;line-height:14px;
}

/* 罗盘 + 比例尺 */
#hud{
  position:fixed;right:18px;top:196px;z-index:29;display:flex;flex-direction:column;gap:10px;align-items:center;
}
#compass{
  width:62px;height:62px;border-radius:50%;background:var(--panel);border:1px solid var(--line);
  box-shadow:var(--shadow);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  position:relative;display:grid;place-items:center;
}
#needle{position:absolute;inset:0;transition:transform .06s linear}
#needle .n{
  position:absolute;left:50%;top:6px;transform:translateX(-50%);
  font-family:var(--serif);font-size:11px;color:var(--accent2);font-weight:700;
}
#needle .bar{position:absolute;left:50%;top:20px;bottom:20px;width:1px;background:linear-gradient(#c2553f 50%,#9fb2bd 50%);transform:translateX(-50%)}
#scalebar{
  background:var(--panel);border:1px solid var(--line);border-radius:9px;padding:7px 10px 6px;
  box-shadow:var(--shadow);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  text-align:center;width:152px;box-sizing:border-box;overflow:hidden;
}
#scalebar .bar{height:7px;border-left:1.5px solid var(--ink2);border-right:1.5px solid var(--ink2);border-bottom:1.5px solid var(--ink2);margin:0 auto}
#scalebar .lb{font-size:10px;color:var(--ink2);margin-top:3px;letter-spacing:.05em}

/* ---------- 提示 ---------- */
#hint{
  position:fixed;left:18px;bottom:18px;z-index:30;display:flex;gap:6px;flex-wrap:wrap;max-width:calc(100vw - 120px);
}
#hint span{
  font-size:10.5px;color:var(--ink2);background:var(--panel);border:1px solid var(--line);
  padding:5px 9px;border-radius:20px;backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  box-shadow:0 2px 10px rgba(18,40,60,.07);white-space:nowrap;
}

/* ---------- 信息面板 ---------- */
#info{
  position:fixed;right:18px;top:74px;bottom:18px;width:376px;z-index:40;
  padding:18px 0;pointer-events:none;
  display:flex;flex-direction:column;justify-content:center;
}
#info-in{
  pointer-events:auto;background:var(--panel-solid);border:1px solid var(--line);
  border-radius:18px;box-shadow:0 20px 60px rgba(18,40,60,.22),0 2px 8px rgba(18,40,60,.08);
  overflow:hidden;transform:translateX(115%);opacity:0;
  transition:transform .46s cubic-bezier(.22,.9,.24,1),opacity .32s;
  max-height:calc(100vh - 36px);display:flex;flex-direction:column;
}
#info.show #info-in{transform:none;opacity:1}
.art-wrap{position:relative;background:#e7eef4;cursor:zoom-in;flex:0 0 auto}
.art-wrap img{display:block;width:100%;height:auto;aspect-ratio:3/2;object-fit:cover}
.art-wrap .zoom{
  position:absolute;right:10px;bottom:10px;font-size:10px;color:#fff;letter-spacing:.06em;
  background:rgba(12,28,40,.5);backdrop-filter:blur(6px);padding:4px 8px;border-radius:20px;
}
.art-wrap .badge{
  position:absolute;left:12px;top:12px;font-size:10px;letter-spacing:.1em;color:#fff;
  background:rgba(12,28,40,.42);backdrop-filter:blur(6px);padding:4px 9px;border-radius:20px;
}
.body{padding:16px 20px 18px;overflow-y:auto}
#info .cat{font-size:10px;letter-spacing:.18em;color:var(--accent);font-weight:600}
#info h2{
  margin:5px 0 2px;font-family:var(--serif);font-size:25px;letter-spacing:.08em;font-weight:600;
}
#info .en{font-size:10.5px;color:var(--ink3);letter-spacing:.05em;margin-bottom:11px}
#info p{margin:0;font-size:12.8px;line-height:1.82;color:var(--ink2);text-align:justify}
#info .tags{display:flex;gap:6px;flex-wrap:wrap;margin:12px 0 0}
#info .tags b{
  font-weight:400;font-size:10.5px;color:var(--ink2);background:rgba(18,36,47,.055);
  padding:3px 9px;border-radius:20px;letter-spacing:.04em;
}
#info .meta{
  display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin:14px 0 0;
  background:var(--line);border-radius:10px;overflow:hidden;
}
#info .meta div{background:#fff;padding:9px 10px}
#info .meta span{display:block;font-size:9.5px;color:var(--ink3);letter-spacing:.1em;margin-bottom:3px}
#info .meta b{font-size:12.5px;color:var(--ink);font-weight:600;font-variant-numeric:tabular-nums}
#info .acts{display:flex;gap:8px;margin-top:15px}
#info .acts button{
  flex:1;padding:10px;border-radius:10px;border:1px solid var(--line);background:#fff;
  font-family:inherit;font-size:12px;color:var(--ink);cursor:pointer;transition:.16s;letter-spacing:.04em;
}
#info .acts button:hover{border-color:rgba(14,127,146,.45);color:var(--accent);background:rgba(14,127,146,.05)}
#info .acts button.primary{
  background:var(--accent);border-color:var(--accent);color:#fff;
}
#info .acts button.primary:hover{background:#0c6c7c}
#info-x{
  position:absolute;right:11px;top:11px;width:28px;height:28px;border-radius:50%;
  background:rgba(12,28,40,.42);backdrop-filter:blur(6px);color:#fff;display:grid;place-items:center;
  cursor:pointer;font-size:15px;line-height:1;z-index:3;transition:.16s;
}
#info-x:hover{background:rgba(12,28,40,.72)}

/* ---------- 灯箱 ---------- */
#lightbox{
  position:fixed;inset:0;z-index:90;background:rgba(10,20,28,.82);backdrop-filter:blur(8px);
  display:grid;place-items:center;padding:4vh 4vw;opacity:0;pointer-events:none;transition:opacity .3s;
}
#lightbox.show{opacity:1;pointer-events:auto}
#lightbox img{
  max-width:100%;max-height:84vh;border-radius:12px;box-shadow:0 30px 80px rgba(0,0,0,.5);
}
#lightbox .cap{color:rgba(255,255,255,.8);font-size:12.5px;text-align:center;margin-top:14px;letter-spacing:.08em}
#lightbox .close{position:fixed;right:26px;top:22px;color:#fff;font-size:26px;cursor:pointer;opacity:.7}
#lightbox .close:hover{opacity:1}

/* ---------- 加载 ---------- */
#loading{
  position:fixed;inset:0;z-index:99;background:linear-gradient(180deg,#eef4f9,#dbe7f0);
  display:grid;place-items:center;transition:opacity .6s;
}
#loading.done{opacity:0;pointer-events:none}
#loading .ld{text-align:center}
#loading h3{
  font-family:var(--serif);font-size:30px;letter-spacing:.4em;color:var(--ink);margin:0 0 6px;
  text-indent:.4em;font-weight:600;
}
#loading .s{font-size:11px;color:var(--ink3);letter-spacing:.2em;margin-bottom:22px}
#loading .track{width:220px;height:2px;background:rgba(18,36,47,.1);margin:0 auto;overflow:hidden;border-radius:2px}
#loading .fill{height:100%;width:0;background:var(--accent);transition:width .3s}
#loading .t{font-size:10.5px;color:var(--ink3);margin-top:12px;letter-spacing:.1em;height:14px}

/* ---------- 悬浮标签 ---------- */
#labels{position:fixed;inset:0;z-index:20;pointer-events:none;overflow:hidden}
.lb{
  position:absolute;left:0;top:0;pointer-events:auto;cursor:pointer;
  transform:translate(-50%,-50%);white-space:nowrap;will-change:transform,opacity;
}
.lb .pin{display:flex;align-items:center;gap:6px;transition:transform .18s}
.lb .n{
  font-size:12px;color:var(--ink);background:rgba(255,255,255,.9);
  padding:3px 9px;border-radius:20px;border:1px solid var(--line);
  box-shadow:0 2px 9px rgba(18,40,60,.12);letter-spacing:.06em;
  backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
  font-family:var(--serif);font-size:12.5px;
}
.lb .n:before{
  content:"";display:inline-block;width:5px;height:5px;border-radius:50%;background:var(--dot,#c2553f);
  margin-right:6px;vertical-align:1px;
}
.lb:hover .pin{transform:scale(1.08)}
.lb:hover .n{background:#fff;border-color:rgba(14,127,146,.5);color:var(--accent)}
.lb.on .n{background:var(--accent);color:#fff;border-color:var(--accent)}
.lb.on .n:before{background:#fff}
.lb.road .n{
  font-size:10.5px;padding:2px 8px;color:var(--ink2);background:rgba(255,255,255,.72);
  font-family:inherit;letter-spacing:.04em;
}
.lb.road .n:before{display:none}
.lb.metro .n{
  background:rgba(255,255,255,.92);border-color:rgba(215,63,52,.4);
}
.lb.metro .n:before{background:#d73f34;width:7px;height:7px;
  box-shadow:0 0 0 2px rgba(215,63,52,.2)}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  #sidebar{left:12px;right:12px;top:auto;bottom:72px;width:auto;flex-direction:row;align-items:flex-end;gap:6px}
  #search{display:none}
  #list{display:flex;gap:6px;overflow-x:auto;overflow-y:hidden;padding-bottom:4px}
  .grp{display:none}
  .item{flex:0 0 auto;margin:0}
  #brand{left:12px;top:12px;padding:11px 14px;min-width:0}
  #brand h1{font-size:19px}
  #brand .sub{display:none}
  #tools{right:12px;top:12px}
  .tbtn span.tx{display:none}
  #hud{right:12px;top:auto;bottom:150px}
  #info{width:auto;left:12px;right:12px;justify-content:flex-end;padding:0 0 12px}
  #info-in{max-height:62vh}
  #hint{display:none}
}