/* ============================================================
   出口通行实验 — 视觉系统
   ============================================================ */

:root{
  --bg:#0B0F13;
  --surface:#10151A;
  --stage:#0A0E12;

  --ink:#E8EFF4;
  --ink-2:#BECCD5;
  --muted:#7C8C96;

  --line:rgba(232,239,244,.09);
  --line-2:rgba(232,239,244,.18);

  --accent:#7EC4DB;
  --accent-2:#B7E3F0;
  --accent-soft:rgba(126,196,219,.14);
  --bone:#EAF2F6;
  --warn:#DD9678;

  --sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --serif:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",serif;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html,body{overflow-x:clip}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  min-height:100vh;
  font-family:var(--sans);
  font-size:14px;
  line-height:1.8;
  color:var(--ink);
  background:
    radial-gradient(1100px 680px at 82% -8%, rgba(126,196,219,.075), transparent 62%),
    radial-gradient(900px 620px at 2% 104%, rgba(126,196,219,.045), transparent 60%),
    var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
::selection{background:rgba(126,196,219,.28);color:#fff}
canvas{display:block}
button{font-family:inherit}

.wrap{max-width:1320px;margin:0 auto;padding:0 44px}

/* ---------- top bar ---------- */
.topbar{
  max-width:1320px;margin:0 auto;padding:26px 44px;
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  font-size:9.5px;letter-spacing:.26em;color:var(--muted);
}
.brand{display:flex;align-items:center;gap:11px;color:var(--ink-2);white-space:nowrap}
.mark{width:6px;height:6px;background:var(--accent);box-shadow:0 0 14px rgba(126,196,219,.8);flex:0 0 auto}
.top-meta{display:flex;align-items:center;gap:12px;white-space:nowrap}
.top-meta i{width:1px;height:9px;background:var(--line-2)}

/* ---------- hero ---------- */
.hero{padding:54px 0 44px;max-width:860px}
.kicker{
  margin:0;font-size:9px;letter-spacing:.36em;color:var(--muted);text-transform:uppercase;
}
h1{
  margin:20px 0 0;
  font-family:var(--serif);font-weight:300;
  font-size:clamp(62px,7.6vw,104px);line-height:.96;letter-spacing:.055em;
  color:var(--ink);
}
.lede{
  margin:26px 0 0;max-width:600px;
  font-size:14.5px;line-height:2.05;font-weight:300;color:#98A8B2;
}

/* ---------- presets ---------- */
.presets{
  display:flex;align-items:center;flex-wrap:wrap;gap:6px;
  padding:12px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.presets-label{
  font-size:9px;letter-spacing:.3em;color:var(--muted);margin-right:16px;
}
.presets-hint{
  margin-left:auto;font-size:9px;letter-spacing:.16em;color:var(--muted);
}
.preset{
  position:relative;display:inline-flex;align-items:baseline;gap:9px;
  padding:4px 13px;border:0;border-radius:2px;background:none;cursor:pointer;
  color:var(--muted);font-size:12px;letter-spacing:.06em;
  transition:color .3s var(--ease),background-color .3s var(--ease);
}
.preset em{font-style:normal;font-size:8.5px;letter-spacing:.14em;opacity:.55;transition:color .3s}
.preset:hover{color:var(--ink-2)}
.preset.is-active{color:var(--ink);background:rgba(126,196,219,.06)}
.preset.is-active em{color:var(--accent);opacity:1}
.preset:focus-visible{outline:1px solid var(--accent);outline-offset:2px}

.lede,.lab-note,.chart-note,.why-item p,.why-note p,.stall-note{text-wrap:pretty}

/* ---------- lab ---------- */
.lab{margin-top:26px}
.scenes{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:18px;min-width:0}

.scene{
  margin:0;min-width:0;display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--line);border-radius:2px;overflow:hidden;
}
.scene-head{
  display:flex;align-items:center;gap:9px;flex:0 0 auto;
  height:44px;padding:0 14px;border-bottom:1px solid var(--line);
}
.scene-title{font-size:12px;letter-spacing:.08em;color:var(--ink)}
.tag{
  font-size:8.5px;letter-spacing:.14em;line-height:1.2;color:var(--muted);
  border:1px solid var(--line-2);border-radius:999px;padding:2px 7px 3px;
}
.tag.accent{color:var(--accent);border-color:rgba(126,196,219,.42)}
.scene-time{
  margin-left:auto;font-size:10.5px;letter-spacing:.05em;color:var(--ink-2);
  font-variant-numeric:tabular-nums;
}
.scene-time small{font-size:8px;margin-left:1px;color:var(--muted)}
.canvas-wrap{position:relative;width:100%;aspect-ratio:432 / 256;background:var(--stage)}
.canvas-wrap canvas{position:absolute;inset:0;width:100%;height:100%}
.scene-foot{padding:12px 14px 14px;border-top:1px solid var(--line);margin-top:auto}
.bar{height:1px;background:var(--line-2);position:relative;overflow:hidden}
.bar i{position:absolute;top:0;bottom:0;left:0;width:0;background:var(--accent);transition:width .18s linear}
.foot-row{
  display:flex;justify-content:space-between;gap:10px;margin-top:10px;
  font-size:9.5px;letter-spacing:.05em;color:var(--muted);font-variant-numeric:tabular-nums;
}
.foot-row b{font-weight:400;color:var(--ink-2)}

/* ---------- console ---------- */
.console{
  margin-top:18px;background:var(--surface);border:1px solid var(--line);border-radius:2px;
  padding:15px 24px 20px;
}
.con-head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-bottom:12px;border-bottom:1px solid var(--line);
  font-size:9px;letter-spacing:.26em;color:var(--muted);
}
.con-grid{
  display:grid;
  grid-template-columns:repeat(5,minmax(0,1fr)) 252px;
  gap:16px 26px;padding-top:16px;align-items:start;
}
.con-grid .ctrl{margin-bottom:0}
.con-grid .ctrl.wide{grid-column:span 2}
.con-side{
  grid-column:6;grid-row:1 / span 2;min-width:0;height:100%;
  display:flex;flex-direction:column;justify-content:space-between;gap:16px;
}
.live{display:inline-flex;align-items:center;gap:7px;letter-spacing:.16em;color:var(--accent);font-size:8.5px}
.live i{width:5px;height:5px;border-radius:50%;background:var(--accent);box-shadow:0 0 8px var(--accent);animation:pulse 2.6s infinite}
.live.is-paused{color:var(--muted)}
.live.is-paused i{background:var(--muted);box-shadow:none;animation:none}
.live.is-done{color:var(--muted)}
.live.is-done i{animation:none;opacity:.7;background:var(--muted);box-shadow:none}
.live.is-stalled{color:var(--warn)}
.live.is-stalled i{background:var(--warn);box-shadow:none;animation:none}
.stall-note{
  margin:12px 0 0;padding:10px 13px;border:1px solid rgba(221,150,120,.32);
  background:rgba(221,150,120,.045);color:#DBA287;
  font-size:10px;line-height:1.8;letter-spacing:.04em;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.22}}

.ctrl{margin-bottom:10px}
.ctrl:last-child{margin-bottom:0}
.ctrl-top{display:flex;align-items:baseline;justify-content:space-between;gap:10px;font-size:11px;color:var(--ink-2)}
.ctrl-top label{cursor:pointer}
.ctrl-top output{font-size:10.5px;color:var(--ink);font-variant-numeric:tabular-nums;letter-spacing:.04em}

input[type="range"]{
  -webkit-appearance:none;appearance:none;
  width:100%;height:24px;margin:6px 0 0;background:transparent;cursor:pointer;
}
input[type="range"]::-webkit-slider-runnable-track{
  height:1px;border-radius:1px;
  background:linear-gradient(to right,var(--accent) 0 var(--p,50%),var(--line-2) var(--p,50%) 100%);
}
input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;
  width:11px;height:11px;margin-top:-5px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 0 4px rgba(126,196,219,.13),0 0 12px rgba(126,196,219,.45);
  transition:transform .2s var(--ease);
}
input[type="range"]:active::-webkit-slider-thumb{transform:scale(1.18)}
input[type="range"]::-moz-range-track{height:1px;background:var(--line-2)}
input[type="range"]::-moz-range-progress{height:1px;background:var(--accent)}
input[type="range"]::-moz-range-thumb{
  width:11px;height:11px;border:0;border-radius:50%;background:var(--accent);
  box-shadow:0 0 0 4px rgba(126,196,219,.13);
}
input[type="range"]:focus-visible{outline:none}
input[type="range"]:focus-visible::-webkit-slider-thumb{box-shadow:0 0 0 4px rgba(126,196,219,.3)}

.seg{display:grid;grid-template-columns:repeat(5,1fr);gap:4px}
.seg button{
  padding:8px 0;border:1px solid var(--line-2);border-radius:2px;background:transparent;
  color:var(--muted);font-size:11px;font-variant-numeric:tabular-nums;cursor:pointer;
  transition:color .25s,border-color .25s,background-color .25s;
}
.seg button:hover{color:var(--ink-2);border-color:rgba(232,239,244,.3)}
.seg button.is-active{background:var(--accent);border-color:var(--accent);color:#0A1014}
.seg button:focus-visible{outline:1px solid var(--accent);outline-offset:2px}
.seg-cap{margin:5px 0 0;font-size:8.5px;letter-spacing:.22em;color:var(--muted)}

.con-diagram{padding-top:2px}
.con-diagram svg{display:block;width:100%;height:auto;overflow:visible}
#diagram text{font-family:var(--sans)}
#diagram .dw{fill:none;stroke:rgba(232,239,244,.34);stroke-width:1.2}
#diagram .dd{fill:none;stroke:var(--accent);stroke-width:2.2;stroke-linecap:round}
#diagram .dp{stroke:var(--bone);stroke-width:2.4;stroke-linecap:round}
#diagram .dash{fill:none;stroke:rgba(232,239,244,.22);stroke-width:1;stroke-dasharray:2 3}
#diagram .arc{stroke:rgba(126,196,219,.5)}
#diagram .dlab{fill:var(--muted);font-size:9px;font-style:italic}
#diagram .dt2{fill:rgba(126,196,219,.72);font-size:7.5px;letter-spacing:.14em}
.diagram-cap{
  display:flex;align-items:center;gap:6px;margin:8px 0 0;
  font-size:8.5px;letter-spacing:.1em;color:var(--muted);white-space:nowrap;
}
.diagram-cap span{
  font-family:var(--serif);font-style:italic;font-size:11px;color:var(--accent);letter-spacing:0;
}

.con-side{display:flex;flex-direction:column;gap:14px;min-width:0}
.readout{display:flex;gap:26px}
.readout > div{min-width:0}
.readout .k{display:block;margin-bottom:4px;font-size:8.5px;letter-spacing:.18em;color:var(--muted);white-space:nowrap}
.readout .v{
  font-size:20px;font-weight:300;letter-spacing:.02em;line-height:1.1;
  font-variant-numeric:tabular-nums;color:var(--ink);
}
.readout .v.good{color:var(--accent)}
.readout .v.bad{color:var(--warn)}
.actions{display:flex;gap:8px}
.btn{
  flex:1;padding:10px 0;border:1px solid var(--line-2);border-radius:2px;background:transparent;
  color:var(--ink);font-size:9.5px;letter-spacing:.24em;cursor:pointer;
  transition:background-color .25s,border-color .25s,color .25s;
}
.btn:hover{background:rgba(232,239,244,.05);border-color:rgba(232,239,244,.3)}
.btn[disabled]{opacity:.38;cursor:default}
.btn[disabled]:hover{background:transparent;border-color:var(--line-2)}
.btn.ghost{flex:0 0 72px;color:var(--muted)}
.btn:focus-visible{outline:1px solid var(--accent);outline-offset:2px}

.lab-note{margin:14px 0 0;max-width:780px;font-size:10px;letter-spacing:.06em;color:var(--muted);text-wrap:pretty}

/* ---------- chart ---------- */
.chart-section{margin-top:58px;padding-top:26px;border-top:1px solid var(--line)}
.chart-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap}
.chart-head h2{
  margin:10px 0 0;font-family:var(--serif);font-weight:300;
  font-size:34px;letter-spacing:.05em;color:var(--ink);
}
.legend{display:flex;flex-wrap:wrap;gap:8px 24px;font-size:10px;letter-spacing:.08em;color:var(--muted);padding-bottom:5px}
.legend span{display:inline-flex;align-items:center;gap:9px}
.legend i{display:inline-block;width:18px;height:1px;background:var(--line-2)}
.legend .l-a{background:rgba(232,239,244,.46)}
.legend .l-b{background:var(--accent)}
.chart-wrap{position:relative;width:100%;height:240px;margin-top:16px}
.chart-wrap canvas{position:absolute;inset:0;width:100%;height:100%}
.chart-note{margin:14px 0 0;font-size:10px;letter-spacing:.07em;color:var(--muted)}

/* ---------- why ---------- */
.why{margin-top:98px;padding-top:44px;border-top:1px solid var(--line)}
.why-head h2{
  margin:12px 0 0;font-family:var(--serif);font-weight:300;
  font-size:clamp(28px,3.4vw,40px);letter-spacing:.05em;color:var(--ink);
}
.why-head > p:last-child{margin:14px 0 0;font-size:13px;color:var(--muted);font-weight:300}
.why-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:44px;margin-top:50px}
.why-item{min-width:0}
.why-art{border-top:1px solid var(--line-2);padding-top:18px;width:150px;max-width:100%}
.why-art svg{display:block;width:150px;height:96px;overflow:visible}
.wall{fill:none;stroke:rgba(232,239,244,.3);stroke-width:1.4}
.door{fill:none;stroke:var(--accent);stroke-width:2;stroke-linecap:round}
.panel{fill:none;stroke:var(--bone);stroke-width:2.2;stroke-linecap:round;opacity:.9}
.dot{fill:rgba(232,239,244,.3)}
.why-item h3{
  display:flex;align-items:baseline;gap:10px;margin:18px 0 0;
  font-size:14px;font-weight:400;letter-spacing:.1em;color:var(--ink);
}
.why-item h3 em{font-style:normal;font-size:9px;letter-spacing:.1em;color:var(--accent)}
.why-item p{margin:10px 0 0;max-width:330px;font-size:12.5px;line-height:1.95;color:#8B9BA5;font-weight:300}

.why-note{
  margin-top:58px;max-width:780px;padding-left:22px;
  border-left:1px solid var(--accent);
}
.why-note p{margin:0;font-size:13.5px;line-height:2.05;color:var(--ink-2);font-weight:300}
.why-note .small{margin-top:14px;font-size:10.5px;letter-spacing:.04em;color:var(--muted)}

/* ---------- footer ---------- */
.foot{
  max-width:1320px;margin:96px auto 0;padding:24px 44px 40px;
  border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:9px;letter-spacing:.24em;color:var(--muted);
}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.is-in{opacity:1;transform:none}

@media (prefers-reduced-motion: reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .live i{animation:none}
  *{scroll-behavior:auto !important}
}

/* ---------- responsive ---------- */
@media (max-width:1180px){
  .con-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:20px 28px}
  .con-grid .ctrl.wide{grid-column:auto}
  .con-side{grid-column:1 / -1;grid-row:auto;flex-direction:row;align-items:flex-end;justify-content:space-between;gap:32px;padding-top:4px}
  .actions{flex:0 0 260px}
}

@media (max-width:860px){
  .wrap{padding:0 28px}
  .topbar{padding:20px 28px}
  .foot{padding:22px 28px 34px}
  .hero{padding:40px 0 34px}
  .lede{font-size:13.5px;line-height:1.95}
  .lab{margin-top:20px}
  .scenes{grid-template-columns:minmax(0,1fr)}
  .con-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 28px}
  .con-side{flex-direction:column;align-items:stretch;gap:14px}
  .actions{flex:none}
  .chart-wrap{height:190px}
  .chart-head h2{font-size:28px}
  .foot{margin-top:72px}
}

@media (max-width:520px){
  .wrap{padding:0 18px}
  .topbar{padding:16px 18px;letter-spacing:.2em}
  .foot{padding:18px 18px 28px;flex-direction:column;align-items:flex-start;gap:8px}
  .top-meta{display:none}
  h1{font-size:54px}
  .hero{padding:28px 0 26px}
  .console{padding:14px 16px 18px}
  .con-grid{grid-template-columns:minmax(0,1fr);gap:18px}
  .con-side{grid-column:auto}
  .seg button{padding:7px 0}
  .readout .v{font-size:20px}
  .btn.ghost{flex:0 0 62px}
  .chart-wrap{height:160px}
  .why-note{padding-left:16px;margin-top:40px}
  .why-grid{gap:28px}
  .scene-time{font-size:9.5px}
}


/* ---------- touch & short-desktop refinements ---------- */
@media (max-width:860px){
  .preset{min-height:42px;align-items:center}
  .seg button{min-height:44px}
  .btn{min-height:44px}
  input[type="range"]{height:44px}
}
@media (min-width:861px) and (max-height:940px){
  .hero{padding:38px 0 32px}
  .canvas-wrap{aspect-ratio:432 / 238}
}


/* ---------- examples ---------- */
.examples{margin-top:64px;padding-top:34px;border-top:1px solid var(--line)}
.examples-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap}
.examples-head h2{margin:10px 0 0;font-family:var(--serif);font-weight:300;font-size:30px;letter-spacing:.05em;color:var(--ink)}
.examples-head > p{margin:0 0 4px;font-size:10.5px;color:var(--muted);letter-spacing:.05em}
.example-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin-top:20px}
.example-card{
  display:flex;align-items:center;justify-content:space-between;gap:18px;
  text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:2px;
  padding:16px 18px;color:inherit;font-family:inherit;cursor:pointer;
  transition:border-color .25s,background-color .25s;
}
.example-card:hover{border-color:rgba(126,196,219,.45);background:#121920}
.example-card:focus-visible{outline:1px solid var(--accent);outline-offset:2px}
.ex-top{display:flex;align-items:baseline;justify-content:flex-start;gap:12px}
.ex-name{font-size:12px;letter-spacing:.06em;color:var(--ink)}
.ex-delta{font-size:12px;font-variant-numeric:tabular-nums;letter-spacing:.02em}
.ex-delta.good{color:var(--accent)}
.ex-delta.bad{color:var(--warn)}
.ex-delta.flat{color:var(--muted)}
.ex-main{min-width:0;flex:1 1 auto}.ex-art{display:block;width:172px;height:100px;flex:0 0 auto}
.ex-art .wall{stroke:rgba(232,239,244,.28);stroke-width:1.2;fill:none}
.ex-art .door{stroke:var(--accent);stroke-width:2;stroke-linecap:round}
.ex-art .panel{stroke:var(--bone);stroke-width:2.6;stroke-linecap:round}
.ex-art .dot{fill:rgba(232,239,244,.22)}
.ex-spec{margin-top:8px;font-size:9px;letter-spacing:.08em;color:var(--muted);font-variant-numeric:tabular-nums}
.closing-note{max-width:660px;margin:54px 0 0;font-size:10px;letter-spacing:.05em;color:var(--muted);text-wrap:pretty}

@media (max-width:860px){
  .example-grid{grid-template-columns:minmax(0,1fr)}
  .ex-art{height:96px}
}
@media (max-width:520px){
  .example-card{flex-direction:column;align-items:flex-start;gap:10px}
  .ex-art{width:100%;height:92px}
}








/* ---------- per-panel scope ---------- */
.panel-scope{
  display:flex;align-items:center;flex-wrap:wrap;gap:8px 14px;
  margin-top:14px;padding-top:13px;border-top:1px solid var(--line);
}
.scope-label{font-size:9px;letter-spacing:.24em;color:var(--muted)}
.scope-seg{display:flex;gap:4px}
.scope-seg button{
  min-width:44px;height:28px;padding:0 10px;
  background:transparent;border:1px solid var(--line-2);border-radius:1px;
  color:var(--muted);font-family:inherit;font-size:10px;letter-spacing:.08em;cursor:pointer;
  transition:color .2s,border-color .2s,background-color .2s;
}
.scope-seg button:hover{color:var(--ink-2);border-color:var(--line-2)}
.scope-seg button.is-active{color:var(--ink);border-color:rgba(126,196,219,.55);background:rgba(126,196,219,.08)}
.scope-seg button[hidden]{display:none}
.scope-hint{font-size:9px;letter-spacing:.04em;color:var(--muted);line-height:1.6}
@media (max-width:520px){
  .panel-scope{gap:8px 10px}
  .scope-hint{flex:1 1 100%}
}

.lab-hint{
  margin:12px 2px 0;font-size:10px;letter-spacing:.05em;color:var(--muted);
}


.report-link{
  margin:46px 0 0;padding:22px 26px;
  border:1px solid var(--line);background:var(--surface);
}
.report-link a{
  display:flex;align-items:baseline;justify-content:space-between;gap:18px;
  color:var(--ink);text-decoration:none;font-size:12px;letter-spacing:.06em;
  border-bottom:none;
}
.report-link a span{color:var(--accent);font-size:15px}
.report-link a:hover{color:var(--accent)}

.beian{
  width:100%;display:flex;align-items:center;flex-wrap:wrap;gap:8px 22px;
  margin-top:14px;padding-top:14px;border-top:1px solid var(--line);
  font-size:9px;letter-spacing:.06em;color:var(--muted);
}
.beian a{display:inline-flex;align-items:center;gap:6px;color:var(--muted);text-decoration:none;border-bottom:none}
.beian a:hover{color:var(--accent)}
.beian svg{width:14px;height:14px;flex:0 0 auto}