:root{
  --bg:#040407; --bg2:#0a0a12; --ink:#e9e9f4; --dim:#8b8ba3; --line:#1c1c2c;
  --choke:#ff2bd6; --bottle:#ff5e3a; --player:#00e5ff; --plat:#ffd166; --cloud:#e8e8ff; --robot:#8b5cf6;
  --grad:linear-gradient(92deg,#ff2bd6 0%,#ff5e3a 28%,#ffd166 52%,#00e5ff 78%,#8b5cf6 100%);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:auto}
body{
  background:var(--bg); color:var(--ink);
  font-family:'Space Grotesk','Noto Sans SC',sans-serif;
  overflow-x:hidden; -webkit-font-smoothing:antialiased;
}
::selection{background:var(--choke);color:#000}
::-webkit-scrollbar{width:10px}
::-webkit-scrollbar-track{background:var(--bg)}
::-webkit-scrollbar-thumb{background:#26263a;border-radius:5px}
a{color:inherit}
.noise{position:fixed;inset:0;z-index:120;pointer-events:none;opacity:.05;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");}
.mono{font-family:'JetBrains Mono',monospace}

/* ---------- nav ---------- */
nav{position:fixed;top:0;left:0;right:0;z-index:100;display:flex;justify-content:space-between;align-items:center;
  padding:18px 28px;mix-blend-mode:difference}
nav .logo{font-weight:700;letter-spacing:.18em;font-size:13px}
nav .logo b{color:#fff}
nav ul{display:flex;gap:26px;list-style:none;font-size:12px;letter-spacing:.12em}
nav a{text-decoration:none;opacity:.75;transition:opacity .25s}
nav a:hover{opacity:1}
@media(max-width:760px){nav ul{display:none} #hero{padding-top:110px}}

/* ---------- hero ---------- */
#hero{min-height:100vh;position:relative;display:flex;flex-direction:column;justify-content:center;padding:0 6vw;overflow:hidden}
#hero .kicker{font-size:13px;letter-spacing:.4em;color:var(--dim);margin-bottom:3vh}
#hero h1{font-size:clamp(54px,11vw,168px);line-height:.94;font-weight:700;letter-spacing:-.02em;text-transform:uppercase}
#hero h1 .row{display:block;overflow:hidden}
#hero h1 .char{display:inline-block;will-change:transform}
#hero h1 .grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
#hero h1 .hollow{color:transparent;-webkit-text-stroke:1.5px #3a3a55}
#hero .sub{max-width:560px;margin-top:4vh;color:var(--dim);font-size:15px;line-height:1.9}
#hero .sub b{color:var(--ink)}
.beam{position:absolute;left:0;right:0;height:1px;top:50%;
  background:var(--grad);transform-origin:left;opacity:.5;pointer-events:none}
.hero-stats{display:flex;gap:6vw;margin-top:6vh;flex-wrap:wrap}
.hero-stats .stat .n{font-size:clamp(26px,3.4vw,44px);font-weight:700;font-family:'JetBrains Mono',monospace}
.hero-stats .stat .l{font-size:11px;letter-spacing:.25em;color:var(--dim);margin-top:4px}
.scroll-hint{position:absolute;bottom:4vh;left:6vw;font-size:11px;letter-spacing:.3em;color:var(--dim);display:flex;align-items:center;gap:12px}
.scroll-hint:after{content:"";width:60px;height:1px;background:var(--dim);display:block;animation:pulseW 2s infinite}
@keyframes pulseW{0%,100%{transform:scaleX(.3);opacity:.3}50%{transform:scaleX(1);opacity:1}}

/* ticker marquee */
.marquee{position:absolute;bottom:0;left:0;right:0;border-top:1px solid var(--line);padding:14px 0;overflow:hidden;white-space:nowrap}
.marquee .track{display:inline-block;animation:mq 38s linear infinite;font-family:'JetBrains Mono',monospace;font-size:13px;color:var(--dim)}
.marquee b{color:var(--ink)} .marquee i{color:var(--choke);font-style:normal}
@keyframes mq{from{transform:translateX(0)}to{transform:translateX(-50%)}}

/* ---------- section headers ---------- */
.sec-head{padding:16vh 6vw 8vh}
.sec-head .no{font-family:'JetBrains Mono',monospace;color:var(--choke);font-size:13px;letter-spacing:.3em}
.sec-head h2{font-size:clamp(34px,6vw,86px);font-weight:700;letter-spacing:-.01em;margin-top:14px;line-height:1.05}
.sec-head p{color:var(--dim);max-width:620px;margin-top:18px;font-size:15px;line-height:1.9}

/* ---------- mental models (horizontal) ---------- */
#models{position:relative}
.h-wrap{overflow:hidden}
.h-track{display:flex;gap:4vw;padding:0 6vw 14vh;will-change:transform}
.m-card{flex:0 0 min(560px,78vw);border:1px solid var(--line);border-radius:18px;padding:42px;background:linear-gradient(160deg,#0c0c16,#07070d);position:relative;overflow:hidden}
.m-card .idx{font-family:'JetBrains Mono',monospace;font-size:80px;font-weight:700;color:transparent;-webkit-text-stroke:1px #2c2c44;line-height:1}
.m-card h3{font-size:26px;margin:22px 0 6px}
.m-card .en{font-size:12px;letter-spacing:.22em;color:var(--choke);text-transform:uppercase}
.m-card p{color:var(--dim);font-size:14.5px;line-height:1.95;margin-top:16px}
.m-card .q{margin-top:22px;padding-left:16px;border-left:2px solid var(--choke);font-size:13px;color:var(--ink);line-height:1.8;font-style:italic}
.m-card .glow{position:absolute;width:280px;height:280px;border-radius:50%;filter:blur(90px);opacity:.16;right:-60px;top:-60px}

/* ---------- 3D chain ---------- */
#chain3d{position:relative}
#stage{position:relative;height:100vh;overflow:hidden}
#gl{position:absolute;inset:0}
#labels{position:absolute;inset:0;pointer-events:none;overflow:hidden}
.nlabel{position:absolute;left:0;top:0;font-family:'JetBrains Mono',monospace;font-size:11px;letter-spacing:.06em;color:#cfd0e8;text-shadow:0 0 8px #000,0 2px 14px #000;white-space:nowrap;text-align:center;transform:translate(-50%,-100%)}
.nlabel small{display:block;font-family:'Noto Sans SC';font-size:10px;color:var(--dim);letter-spacing:.05em;text-align:center}
.cap{position:absolute;left:5vw;bottom:7vh;max-width:480px;z-index:5;pointer-events:none}
.cap .layer-no{font-family:'JetBrains Mono',monospace;color:var(--choke);font-size:12px;letter-spacing:.3em}
.cap h3{font-size:clamp(26px,3.4vw,46px);margin:10px 0 8px;font-weight:700}
.cap p{color:var(--dim);font-size:14px;line-height:1.85}
.cap .q{margin-top:14px;font-size:12.5px;color:#b9b9d6;border-left:2px solid var(--player);padding-left:12px;line-height:1.7;font-style:italic}
.legend{position:absolute;right:3vw;bottom:7vh;z-index:5;font-size:11px;letter-spacing:.1em;color:var(--dim);display:flex;flex-direction:column;gap:8px;pointer-events:none}
.legend span{display:flex;align-items:center;gap:8px}
.legend i{width:9px;height:9px;border-radius:50%;display:inline-block}
.hud{position:absolute;top:84px;left:5vw;z-index:6;display:flex;gap:10px;align-items:center}
.hud button{background:#0d0d18cc;border:1px solid var(--line);color:var(--ink);font-family:'JetBrains Mono',monospace;
  font-size:11px;letter-spacing:.15em;padding:10px 16px;border-radius:999px;cursor:pointer;backdrop-filter:blur(8px);transition:.25s}
.hud button:hover,.hud button.on{border-color:var(--player);color:var(--player)}
.hud .tip{font-size:11px;color:var(--dim);letter-spacing:.1em}
.progress-rail{position:absolute;top:50%;right:2.2vw;transform:translateY(-50%);z-index:6;display:flex;flex-direction:column;gap:10px}
.progress-rail i{width:6px;height:6px;border-radius:50%;background:#2c2c44;transition:.3s}
.progress-rail i.on{background:var(--choke);box-shadow:0 0 10px var(--choke)}
#tooltip{position:fixed;z-index:90;pointer-events:none;background:#0d0d18ee;border:1px solid var(--line);border-radius:10px;
  padding:10px 14px;font-size:12px;display:none;backdrop-filter:blur(8px)}
#tooltip b{font-family:'JetBrains Mono',monospace}
#tooltip em{display:block;color:var(--dim);font-style:normal;font-size:11px;margin-top:2px}

/* node info panel */
#panel{position:fixed;top:0;right:0;height:100vh;width:min(440px,92vw);z-index:110;background:#0a0a13f2;
  border-left:1px solid var(--line);backdrop-filter:blur(16px);transform:translateX(105%);transition:transform .5s cubic-bezier(.7,0,.2,1);
  padding:90px 34px 34px;overflow-y:auto}
#panel.open{transform:translateX(0)}
#panel .close{position:absolute;top:24px;right:24px;background:none;border:1px solid var(--line);color:var(--ink);
  width:38px;height:38px;border-radius:50%;cursor:pointer;font-size:16px}
#panel .tk{font-family:'JetBrains Mono',monospace;font-size:13px;letter-spacing:.2em}
#panel h3{font-size:30px;margin:8px 0 2px}
#panel .role{font-size:12px;color:var(--dim);letter-spacing:.15em;margin-bottom:18px}
#panel .badge{display:inline-block;font-size:10.5px;letter-spacing:.18em;padding:5px 12px;border-radius:999px;border:1px solid;margin-bottom:20px}
#panel .desc{font-size:14px;line-height:2;color:#c6c6de}
.price-box{border:1px solid var(--line);border-radius:14px;padding:18px;margin-bottom:22px;background:#0c0c16}
.price-box .pb-head{display:flex;justify-content:space-between;align-items:baseline}
.price-box .pb-cur{font-family:'JetBrains Mono',monospace;font-size:26px;font-weight:700}
.price-box .pb-cur small{font-size:12px;color:var(--dim);font-weight:400;margin-left:4px}
.price-box .pb-chg{font-family:'JetBrains Mono',monospace;font-size:13px;padding:3px 10px;border-radius:999px}
.price-box .pb-chg.up{color:#5dffa3;background:#5dffa31a}
.price-box .pb-chg.dn{color:#ff5e6e;background:#ff5e6e1a}
.price-box .pb-mc{display:flex;align-items:baseline;gap:10px;margin-top:12px;padding-top:12px;border-top:1px solid var(--line)}
.price-box .pb-mc:first-child{margin-top:0;padding-top:0;border-top:none}
.price-box .pb-mc span{font-size:10px;letter-spacing:.18em;color:var(--dim)}
.price-box .pb-mc b{font-family:'JetBrains Mono',monospace;font-size:17px}
.price-box .pb-mc small{font-size:10px;color:var(--dim)}
.price-box svg{display:block;width:100%;height:54px;margin-top:12px}
.price-box .pb-note{font-size:10.5px;color:var(--dim);margin-top:10px;letter-spacing:.08em;font-family:'JetBrains Mono',monospace}
.price-box.none{color:var(--dim);font-size:12.5px;letter-spacing:.05em}
#panel .quotes{margin-top:26px;display:flex;flex-direction:column;gap:16px}
#panel .qt{border:1px solid var(--line);border-radius:12px;padding:16px;font-size:13px;line-height:1.8;color:#b9b9d6}
#panel .qt .d{font-family:'JetBrains Mono',monospace;font-size:10.5px;color:var(--dim);margin-top:8px;display:block}
#panel .links{margin-top:26px}
#panel .links a{font-size:12px;color:var(--player);letter-spacing:.1em}

/* ---------- four themes / physical AI ---------- */
#themes{position:relative;padding-bottom:6vh}
.themes-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;padding:0 6vw 7vh}
@media(max-width:1000px){.themes-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.themes-grid{grid-template-columns:1fr}}
.t-card{border:1px solid var(--line);border-radius:18px;padding:26px;background:linear-gradient(165deg,#0c0c16,#07070c);position:relative;overflow:hidden;display:flex;flex-direction:column;min-height:340px}
.t-card:before{content:"";position:absolute;left:0;top:0;width:100%;height:3px;background:var(--tc)}
.t-card .t-idx{font-family:'JetBrains Mono',monospace;font-size:12px;letter-spacing:.2em;color:var(--tc)}
.t-card h3{font-size:23px;margin:8px 0 2px}
.t-card .t-en{font-size:11px;letter-spacing:.2em;color:var(--dim);text-transform:uppercase;margin-bottom:16px}
.t-card p{font-size:13px;line-height:1.85;color:#c2c2da;flex:1}
.t-pos{margin:16px 0 12px}
.t-pos .t-rail{position:relative;height:5px;border-radius:3px;background:#1a1a2a;overflow:hidden}
.t-pos .t-rail i{position:absolute;top:0;bottom:0;left:0;background:var(--tc);border-radius:3px;opacity:.5}
.t-pos .t-dot{position:absolute;top:50%;width:11px;height:11px;border-radius:50%;background:var(--tc);transform:translate(-50%,-50%);box-shadow:0 0 12px var(--tc)}
.t-pos .t-lab{display:flex;justify-content:space-between;font-family:'JetBrains Mono',monospace;font-size:9.5px;color:var(--dim);margin-top:7px;letter-spacing:.08em}
.t-tk{display:flex;flex-wrap:wrap;gap:6px;margin-top:4px}
.t-tk span{font-family:'JetBrains Mono',monospace;font-size:10.5px;padding:3px 9px;border-radius:999px;border:1px solid var(--line);color:#cfcfe6}
.t-tk span b{color:var(--tc);font-weight:700}
.t-status{font-family:'JetBrains Mono',monospace;font-size:10.5px;letter-spacing:.12em;color:var(--tc);margin-top:14px}

.phys-wrap{padding:0 6vw}
.phys-head{font-size:clamp(22px,3vw,34px);font-weight:700;margin-bottom:6px}
.phys-head span{color:var(--robot)}
.phys-sub{color:var(--dim);font-size:14px;line-height:1.8;max-width:680px;margin-bottom:34px}
.analogy{display:grid;grid-template-columns:1fr;gap:12px;max-width:860px;margin-bottom:60px}
.an-row{display:grid;grid-template-columns:1.1fr auto 1.1fr 1.4fr;align-items:center;gap:16px;border:1px solid var(--line);border-radius:12px;padding:14px 20px;background:#0b0b13}
.an-row .rb{font-weight:700;font-size:15px}
.an-row .rb small{display:block;font-family:'JetBrains Mono',monospace;font-size:10px;color:var(--robot);letter-spacing:.1em;margin-top:2px}
.an-row .arrow{color:var(--dim);font-family:'JetBrains Mono',monospace;font-size:13px}
.an-row .llm{font-weight:700;font-size:15px;color:var(--player)}
.an-row .note{font-size:12px;color:var(--dim);line-height:1.6}
@media(max-width:720px){.an-row{grid-template-columns:1fr auto 1fr;}.an-row .note{display:none}}
.auto-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;padding:0 6vw 8vh}
@media(max-width:900px){.auto-strip{grid-template-columns:repeat(2,1fr)}}
.auto-tile{border-left:2px solid var(--robot);padding:8px 0 8px 18px}
.auto-tile .an{font-family:'JetBrains Mono',monospace;font-size:clamp(26px,3.2vw,40px);font-weight:700}
.auto-tile .al{font-size:12px;color:var(--dim);line-height:1.6;margin-top:6px}
.auto-tile .al b{color:var(--ink)}

/* ---------- timeline ----------
   每条车道由 data.js 的 TIMELINE.lanes 生成；配色走 --lc（强调色）与 --lgrad（进度渐变），
   摆位走修饰类：tag-bottom（车道名放下方）、tip-above/tip-below（事件文字在轨道上/下）、gap（与上一车道拉开间距） */
#timeline .tl-stage{position:relative;height:100vh;display:flex;flex-direction:column;justify-content:center;padding:0 6vw;overflow:hidden}
.tl-grid{position:relative;border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:60px 0}
.tl-years{display:flex;justify-content:space-between;font-family:'JetBrains Mono',monospace;font-size:11px;color:var(--dim);margin-bottom:34px;letter-spacing:.1em}
.lane{position:relative;height:128px;margin:26px 0 10px}
.lane .lane-tag{position:absolute;left:0;top:-22px;font-size:11px;letter-spacing:.3em;color:var(--dim)}
.lane.tag-bottom .lane-tag{top:auto;bottom:-22px}
.lane .bar{position:absolute;left:0;right:0;top:50%;height:2px;background:#191928}
.lane .fill{position:absolute;left:0;top:50%;height:2px;width:0;transform-origin:left;background:var(--lgrad)}
.lane.gap{margin-top:64px}
.ms{position:absolute;top:50%;transform:translate(-50%,-50%);cursor:default}
.ms i{display:block;width:9px;height:9px;border-radius:50%;background:#222238;border:1px solid #44446a;transition:.3s}
.ms .ms-tip{position:absolute;left:50%;transform:translateX(-50%);width:200px;font-size:11.5px;line-height:1.65;color:var(--ink);opacity:0;transition:opacity .45s,transform .45s;text-align:center;pointer-events:none}
.ms.edge-l .ms-tip{left:-5px;transform:none;text-align:left}
.ms.edge-r .ms-tip{left:auto;right:-5px;transform:none;text-align:right}
.lane.tip-above .ms .ms-tip{bottom:20px}
.lane.tip-below .ms .ms-tip{top:20px}
/* 已过事件：只点亮圆点，弱发光 */
.ms.lit i{background:color-mix(in srgb,var(--lc) 42%,#20202f);border-color:var(--lc);box-shadow:none}
/* 最近一个已过事件：强发光 + 唯一显示文字 */
.ms.focus i{background:var(--lc);border-color:var(--lc);box-shadow:0 0 16px var(--lc);transform:scale(1.35)}
.ms.focus .ms-tip{opacity:1}
.ms .y{display:block;font-family:'JetBrains Mono',monospace;font-size:10px;color:var(--lc);letter-spacing:.1em;margin-bottom:3px}
.tl-now{position:absolute;top:0;bottom:0;width:1px;background:var(--grad);opacity:.85;box-shadow:0 0 24px #ff2bd688}
.tl-now:after{content:"NOW";position:absolute;top:-26px;left:-16px;font-family:'JetBrains Mono',monospace;font-size:10px;letter-spacing:.2em;color:var(--ink)}
.tl-note{margin-top:38px;font-size:13px;color:var(--dim);max-width:640px;line-height:1.9}

/* ---------- evidence ---------- */
#evidence .wall{columns:3;column-gap:22px;padding:0 6vw 10vh}
@media(max-width:1100px){#evidence .wall{columns:2}}
@media(max-width:700px){#evidence .wall{columns:1}}
.tweet{break-inside:avoid;border:1px solid var(--line);border-radius:16px;padding:24px;margin-bottom:22px;
  background:linear-gradient(170deg,#0c0c16,#07070b);transition:transform .35s,border-color .35s;display:block;text-decoration:none}
.tweet:hover{transform:translateY(-4px) rotate(.4deg);border-color:#33335a}
.tweet .meta{display:flex;justify-content:space-between;font-family:'JetBrains Mono',monospace;font-size:10.5px;color:var(--dim);margin-bottom:12px;letter-spacing:.08em}
.tweet .meta .likes{color:var(--choke)}
.tweet p{font-size:13.5px;line-height:1.9;color:#c9c9e0;white-space:pre-line}
.tweet p b{color:var(--ink)}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:8vh 6vw;display:grid;grid-template-columns:1.4fr 1fr;gap:40px}
@media(max-width:800px){footer{grid-template-columns:1fr}}
footer h4{font-size:13px;letter-spacing:.3em;color:var(--dim);margin-bottom:16px}
footer p{font-size:13px;color:var(--dim);line-height:2}
footer .big{font-size:clamp(28px,4vw,52px);font-weight:700;color:var(--ink);line-height:1.2;letter-spacing:-.01em}
footer .big span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---------- mobile portrait ---------- */
@media(max-width:760px){
  #hero h1{font-size:clamp(40px,12.5vw,90px)}
  .hero-stats{gap:8vw}
  .m-card{padding:28px;flex-basis:82vw}
  .m-card .idx{font-size:56px}
  .m-card h3{font-size:21px}
  .cap{left:5vw;right:5vw;bottom:9vh;max-width:none}
  .cap h3{font-size:24px}
  .cap p{font-size:12.5px}
  .cap .q{font-size:11.5px}
  .legend{display:none}
  .hud{top:72px}
  .hud .tip{display:none}
  .nlabel{font-size:9.5px}
  .nlabel small{font-size:8.5px}
  .progress-rail{right:10px;gap:8px}
  #timeline .tl-stage{padding:0 4vw}
  .ms .ms-tip{width:140px;font-size:10.5px}
  .tl-note{font-size:12px}
  #panel{padding:80px 22px 28px}
}

/* ---------- reduced motion ----------
   横滚区不做 pin 动画时必须可以原生横向滚动，否则第 3 张之后的卡片不可达 */
@media (prefers-reduced-motion: reduce){
  .h-wrap{overflow-x:auto}
  .marquee .track{animation:none}
  .scroll-hint:after{animation:none}
}

#webgl-fallback{display:none;position:absolute;inset:0;z-index:4;place-items:center;text-align:center;color:var(--dim);padding:20px}