:root{
  --bg:#050a12; --ink:#eaf4fb; --dim:#7f9cb2; --line:rgba(120,180,220,.18);
  --teal:#2fd3e8; --blue:#3d8bff; --panel:rgba(6,14,24,.78);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;overflow:hidden;background:linear-gradient(180deg,#0b1219 0%,#1b2831 46%,#5a6a72 100%);color:var(--ink);
  font-family:-apple-system,"PingFang SC","Hiragino Sans GB",system-ui,sans-serif;-webkit-font-smoothing:antialiased}
#view{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;background:
  radial-gradient(55% 50% at 50% 40%, rgba(220,235,245,.07), rgba(5,10,18,0) 72%)}

/* ---------- 顶栏 ---------- */
#topbar{position:fixed;left:0;right:0;top:0;z-index:10;display:flex;align-items:flex-start;justify-content:space-between;
  gap:18px;padding:22px 28px;pointer-events:none}
#topbar .titles h1{margin:0;font-size:20px;font-weight:600;letter-spacing:.04em}
#topbar .titles p{margin:6px 0 0;font-size:10.5px;letter-spacing:.24em;color:var(--dim);font-family:ui-monospace,Menlo,monospace}
.back{pointer-events:auto;display:inline-flex;align-items:center;height:36px;padding:0 16px;border-radius:999px;
  background:rgba(6,20,32,.88);border:1px solid rgba(47,211,232,.55);color:#eafcff;
  font:500 13px/1 -apple-system,"PingFang SC","Hiragino Sans GB",sans-serif;letter-spacing:.02em;
  text-decoration:none;backdrop-filter:blur(10px);box-shadow:0 6px 22px rgba(0,0,0,.45);
  transition:background .2s,border-color .2s}
.back:hover{background:rgba(47,211,232,.2);border-color:#2fd3e8;color:#eafcff}

/* ---------- 左侧图例 ---------- */
#legend{position:fixed;left:28px;top:104px;z-index:10;font-size:12px;color:var(--dim);
  background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 16px;backdrop-filter:blur(10px);min-width:168px}
#legend h2{margin:0 0 10px;font-size:11px;letter-spacing:.22em;color:var(--ink);font-weight:600}
.lg{display:flex;align-items:center;gap:8px;margin:6px 0}
.lg i{width:9px;height:9px;border-radius:2px;flex:none}
.lg span{font-family:ui-monospace,Menlo,monospace;color:var(--ink);width:12px}
.lg em{font-style:normal}
.hint{margin-top:10px;padding-top:10px;border-top:1px solid var(--line);font-size:11px;color:#8fb0c6}

/* ---------- 右侧信息 ---------- */
#info{position:fixed;right:28px;top:92px;z-index:10;width:250px;background:var(--panel);border:1px solid var(--line);
  border-radius:16px;padding:16px 18px;backdrop-filter:blur(10px)}
#info .kpi{display:flex;justify-content:space-between;font-size:12px;color:var(--dim);padding:3px 0}
#info .kpi b{color:var(--ink);font-family:ui-monospace,Menlo,monospace;font-weight:600}
#info h3{margin:14px 0 6px;padding-top:12px;border-top:1px solid var(--line);font-size:13.5px;color:var(--teal)}
#info p{margin:0;font-size:12.5px;line-height:1.7;color:var(--dim)}

/* ---------- 底部控制 ---------- */
#controls{position:fixed;left:0;right:0;bottom:0;z-index:10;display:flex;flex-wrap:wrap;gap:16px 22px;align-items:flex-end;
  padding:16px 216px 18px 28px;background:linear-gradient(180deg,rgba(5,10,18,0),rgba(5,10,18,.86) 42%)}
.ctl{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.ctl.grow{flex:1;min-width:180px;flex-direction:column;align-items:stretch;gap:8px}
.ctl label{font-size:11px;letter-spacing:.16em;color:var(--dim);white-space:nowrap}
.ctl output{color:var(--teal);font-family:ui-monospace,Menlo,monospace;margin-left:6px}
input[type=range]{-webkit-appearance:none;appearance:none;width:100%;height:22px;background:transparent}
input[type=range]::-webkit-slider-runnable-track{height:4px;border-radius:3px;
  background:linear-gradient(90deg,var(--teal) 0%,var(--teal) var(--p,0%),rgba(255,255,255,.14) var(--p,0%),rgba(255,255,255,.14) 100%)}
input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;margin-top:-7px;border-radius:50%;
  background:#eafcff;border:2px solid var(--teal);box-shadow:0 0 14px rgba(47,211,232,.6);cursor:pointer}
input[type=range]::-moz-range-track{height:4px;border-radius:3px;background:rgba(255,255,255,.14)}
input[type=range]::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:#eafcff;border:2px solid var(--teal);cursor:pointer}
.chip{appearance:none;background:rgba(10,22,36,.75);border:1px solid var(--line);color:var(--dim);
  border-radius:999px;padding:6px 13px;font-size:12px;cursor:pointer;transition:.2s}
.chip:hover{color:var(--ink);border-color:rgba(140,200,235,.4)}
.chip.on{color:#04121c;background:linear-gradient(135deg,var(--teal),var(--blue));border-color:transparent;font-weight:600}

/* ---------- 徽章 ---------- */
#badge{position:fixed;right:20px;bottom:16px;z-index:20;display:block;opacity:.92}
#badge img{height:32px;width:auto;display:block}

/* ---------- 手机 ---------- */
@media(max-width:820px){
  #topbar{padding:14px 16px}
  #topbar .titles h1{font-size:16px}
  #topbar .titles p{font-size:9px;letter-spacing:.16em}
  /* 手机上把「返回拆解实验」挪到标题下方，别和徽章抢右上角 */
  .back{position:fixed;left:16px;top:74px;height:32px;padding:0 12px;font-size:12px}
  #legend{display:none}
  #info{left:16px;right:16px;top:auto;bottom:150px;width:auto;padding:12px 14px}
  #info .kpi{display:none}
  #info h3{margin:0;padding-top:0;border-top:0;font-size:12.5px}
  #info p{font-size:12px;line-height:1.6}
  #controls{gap:10px 14px;padding:12px 16px 14px}
  .ctl.grow{flex-basis:100%;min-width:0}
  #badge{right:14px;bottom:auto;top:14px}
  #badge img{height:26px}
}

#loading{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);z-index:30;
  font-size:13px;letter-spacing:.18em;color:#cfe4f2;background:rgba(6,14,24,.72);
  border:1px solid rgba(120,180,220,.25);border-radius:999px;padding:10px 20px;backdrop-filter:blur(8px)}