/* Spatial / Vision — dark showcase layout. Offline-safe: system fonts only. */
:root{--bg:#0a0f13;--bg-2:#0d1418;--panel:#111a1f;--panel-2:#152126;--line:#22313a;--line-2:#2e4148;--text:#e6efed;--muted:#93a7ab;--dim:#6f868b;--mint:#7eeac2;--mint-2:#4fc79c;--mint-bg:#16302a;--amber:#e8c08c;--radius:14px;--mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,monospace;--sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",sans-serif;--gutter:clamp(16px,4vw,56px)}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px;-webkit-text-size-adjust:100%}
body{margin:0;background:radial-gradient(1200px 600px at 75% -10%,#123029 0%,transparent 60%),var(--bg);color:var(--text);font:15px/1.7 var(--sans);-webkit-font-smoothing:antialiased}
button,input,select{font:inherit;color:inherit}
button{cursor:pointer;border:1px solid var(--line-2);border-radius:8px;padding:7px 13px;background:var(--panel-2);font-size:13px;line-height:1.4;transition:border-color .15s,background .15s,color .15s}
button:hover:not(:disabled){border-color:#5e9483;background:#1b3530}
button:disabled{opacity:.45;cursor:default}
button.primary,.button.primary{background:var(--mint);color:#0b2a20;border-color:var(--mint);font-weight:600}
button.primary:hover:not(:disabled),.button.primary:hover{background:#9af3d3;color:#0b2a20}
:focus-visible{outline:2px solid var(--mint);outline-offset:3px}
a{color:inherit;text-decoration:none}a:hover{color:var(--mint)}
.mono{font-family:var(--mono)}
.eyebrow{display:block;font:600 12px/1.4 var(--mono);letter-spacing:.14em;color:var(--mint)}
h1,h2,h3{font-weight:600;letter-spacing:-.02em;margin:0}
h2{font-size:clamp(24px,2.6vw,34px);line-height:1.3;margin-top:10px}
i{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--mint)}
kbd{font:12px var(--mono);border:1px solid var(--line-2);border-bottom-width:2px;border-radius:5px;padding:0 6px;margin:0 2px;color:var(--text);background:var(--panel)}
.button{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--line-2);border-radius:999px;padding:10px 20px;font-size:14px;background:#ffffff08;transition:all .15s}
.button:hover{border-color:var(--mint);color:var(--mint)}
[hidden]{display:none!important}

/* Header */
.site-header{position:sticky;top:0;z-index:30;background:#0a0f13cc;backdrop-filter:saturate(1.4) blur(12px);-webkit-backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid #ffffff0d}
.header-inner{max-width:1480px;margin:auto;height:64px;padding:0 var(--gutter);display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:10px;font:600 15px var(--sans);letter-spacing:.16em}
.brand svg{width:26px;height:26px;fill:none;stroke:var(--mint);stroke-width:2;stroke-linecap:round}
.brand em{font-style:normal;font-weight:400;color:var(--muted)}
nav{display:flex;gap:30px;font-size:14px;color:#b9c8cb}
nav a{position:relative;padding:6px 0}
nav a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--mint);transform:scaleX(0);transition:transform .2s}
nav a:hover::after{transform:scaleX(1)}
.header-cta{font-size:13px;color:#0b2a20;background:var(--mint);padding:7px 15px;border-radius:999px;font-weight:600;white-space:nowrap}
.header-cta:hover{color:#0b2a20;background:#9af3d3}

main{max-width:1480px;margin:auto;padding:0 var(--gutter)}
.block{padding:clamp(56px,7vw,96px) 0;border-top:1px solid var(--line)}

/* Hero */
.hero{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:clamp(32px,5vw,72px);align-items:center;padding:clamp(48px,7vw,96px) 0 clamp(56px,7vw,88px)}
h1{font-size:clamp(36px,4.6vw,64px);line-height:1.18;letter-spacing:-.035em;margin:18px 0 22px}
h1 span{background:linear-gradient(90deg,var(--mint),#b8f7df);-webkit-background-clip:text;background-clip:text;color:transparent}
.lede{color:#b3c3c6;font-size:clamp(15px,1.25vw,17px);line-height:1.85;max-width:560px;margin:0}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:30px 0 38px}
.hero-stats{display:grid;grid-template-columns:repeat(4,auto);justify-content:start;gap:12px 36px;margin:0;padding-top:26px;border-top:1px solid var(--line)}
.hero-stats div{display:flex;flex-direction:column-reverse}
.hero-stats dt{font-size:12px;color:var(--muted)}
.hero-stats dd{margin:0;font:600 26px/1.3 var(--sans);letter-spacing:-.02em}
.hero-stats small{font-size:13px;font-weight:400;color:var(--muted)}
.hero-visual{margin:0}
.hero-frame{position:relative;aspect-ratio:960/722;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line-2);box-shadow:0 40px 90px -30px #000c,0 0 0 1px #ffffff08 inset;background:var(--panel)}
.hero-frame img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
/* Diagonal seam sweeps slowly, like the live comparison slider. */
@property --a{syntax:"<percentage>";inherits:false;initial-value:76%}
@property --b{syntax:"<percentage>";inherits:false;initial-value:24%}
@keyframes sweep{0%,100%{--a:86%;--b:34%}50%{--a:64%;--b:12%}}
.hero-render,.hero-seam{--a:76%;--b:24%;animation:sweep 10s ease-in-out infinite}
.hero-render{clip-path:polygon(var(--a) 0,100% 0,100% 100%,var(--b) 100%)}
.hero-seam{position:absolute;inset:0;z-index:1;width:auto;height:auto;border-radius:0;background:var(--mint);pointer-events:none;clip-path:polygon(calc(var(--a) - 1px) 0,calc(var(--a) + 1px) 0,calc(var(--b) + 1px) 100%,calc(var(--b) - 1px) 100%);filter:drop-shadow(0 0 6px var(--mint))}
.hero-frame::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 60%,#0a0f1399);pointer-events:none}
.hero-visual figcaption{margin-top:14px;font-size:13px;color:var(--muted);display:flex;align-items:center;gap:10px}
.hero-visual figcaption::before{content:"";width:22px;height:2px;background:var(--mint);transform:rotate(-55deg)}

/* Shared labels */
.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:28px}
.section-description{font-size:15px;color:var(--muted);max-width:760px;margin:12px 0 0}
.align-label{position:absolute;z-index:2;font-size:12px;letter-spacing:.06em;padding:4px 10px;background:#0a1417d9;border:1px solid #47645a;border-radius:6px;pointer-events:none;backdrop-filter:blur(4px)}
.label-observation{left:12px;top:12px;color:var(--amber)}
.label-render{right:12px;bottom:12px;color:var(--mint)}
.panel-tag{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:#d6e3e0;pointer-events:none}
.panel-tag b{font:600 11px var(--mono);color:#0b2a20;background:var(--mint);border-radius:4px;padding:1px 6px}

/* Stage */
.stage{border:1px solid var(--line-2);border-radius:18px;overflow:hidden;background:linear-gradient(180deg,#121c21,#0e161a);box-shadow:0 40px 100px -40px #000d}
.stage-top{height:46px;display:flex;justify-content:space-between;align-items:center;gap:16px;padding:0 20px;border-bottom:1px solid var(--line);color:#aebfc3;font-size:13px}
.stage-top .live{display:flex;align-items:center;gap:10px}
.stage-top .live i{box-shadow:0 0 0 0 #7eeac288;animation:pulse 2s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 8px #7eeac200}100%{box-shadow:0 0 0 0 #7eeac200}}
#frame-time{color:var(--mint);font-size:13px}
.stage-top-end{color:var(--dim)}
.three-views{display:grid;grid-template-columns:minmax(0,.84fr) minmax(0,1.16fr)}
.spatial{min-width:0;display:flex;flex-direction:column;border-right:1px solid var(--line)}
#phone-panel{position:relative;aspect-ratio:16/9;background:#060c0f;overflow:hidden;flex:none}
#phone-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
#phone-panel>.panel-tag{position:absolute;left:12px;top:12px;z-index:3;background:#0a1417cc;border:1px solid #ffffff1a;border-radius:8px;padding:5px 10px;backdrop-filter:blur(6px)}
#phone-loading{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;background:#081318cc;z-index:2;font-size:14px;color:#c6ddd4}
.map-panel{position:relative;flex:1;display:flex;flex-direction:column;min-height:320px;border-top:1px solid var(--line);background:radial-gradient(ellipse at 50% 40%,#22343a,#0c151a 75%)}
#scene{position:relative;flex:1;min-height:0;overflow:hidden}
#scene>canvas{position:absolute!important;inset:0;width:100%!important;height:100%!important;display:block;touch-action:none}
.map-toolbar{position:absolute;left:0;right:0;z-index:4;display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 12px;pointer-events:none}
.map-toolbar>*{pointer-events:auto}.map-toolbar>.panel-tag,.map-hint{pointer-events:none}
.map-toolbar-top{top:0;background:linear-gradient(180deg,#0a1215cc,transparent)}
.map-toolbar-top>.panel-tag{background:#0a1417cc;border:1px solid #ffffff1a;border-radius:8px;padding:5px 10px}
.map-toolbar-bottom{bottom:0;background:linear-gradient(0deg,#0a1215d9,transparent)}
.map-tools{display:flex;align-items:center;gap:6px}
.map-tools select,.timeline select{background:#0f1c20e6;border:1px solid var(--line-2);border-radius:8px;padding:5px 8px;font-size:12px;color:#cfe5dc;max-width:150px}
.map-tools button,.map-tools .toggle{font-size:12px;padding:5px 10px;background:#0f1c20e6;border:1px solid var(--line-2);border-radius:8px;white-space:nowrap}
.toggle{display:inline-flex;align-items:center;gap:6px;cursor:pointer}
.toggle input{accent-color:var(--mint);margin:0}
.reveal-controls{display:flex;align-items:center;gap:10px;flex:1;max-width:420px}
.reveal-controls button{font-size:12px;padding:5px 10px;background:#0f1c20e6;white-space:nowrap}
.reveal-controls input{flex:1;min-width:40px}
.reveal-controls output{font:12px var(--mono);color:var(--mint);min-width:36px}
.map-hint{font-size:12px;color:var(--dim);white-space:nowrap}
.map-note{flex:none;padding:8px 14px;font-size:12px;color:var(--dim);border-top:1px solid var(--line);background:#0b1317}
#scene-loading{position:absolute;inset:0;z-index:5;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;font-size:14px;color:#c6ddd4;background:#0b171bd9;backdrop-filter:blur(3px);pointer-events:none;text-align:center;padding:20px;transition:all .3s}
#scene-loading.streaming{inset:auto auto 54px 50%;transform:translateX(-50%);flex-direction:row;padding:6px 14px;border-radius:999px;font-size:12px;background:#0a1417e0;border:1px solid var(--line-2);white-space:nowrap}
.progress{display:block;width:180px;height:3px;border-radius:3px;background:#ffffff1a;overflow:hidden}
.streaming .progress{width:80px}
.progress b{display:block;height:100%;background:var(--mint);transform-origin:left;transform:scaleX(0);transition:transform .25s}
#map-retry{position:absolute;z-index:6;left:50%;top:62%;transform:translateX(-50%);white-space:nowrap}
body.map-expanded{overflow:hidden}
body.map-expanded .map-panel{position:fixed;inset:max(12px,2vw);z-index:60;border:1px solid var(--line-2);border-radius:var(--radius);overflow:hidden;box-shadow:0 0 0 100vmax #03070acc}
.views{min-width:0;display:flex;flex-direction:column}
.views-top{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:10px 14px}
.views-top button#open-detail{font-size:12px;padding:5px 10px}
.tabs{display:flex;gap:4px;padding:3px;border:1px solid var(--line);border-radius:9px;background:#0b1317}
.tabs button{font-size:12px;padding:4px 12px;background:transparent;border-color:transparent;border-radius:6px;color:var(--muted)}
.tabs button.active{background:var(--mint-bg);color:var(--mint);border-color:#3d6a5a}
.alignment-wrap{position:relative;flex:1;min-height:0;aspect-ratio:960/722;margin:0 14px;border-radius:10px;overflow:hidden;border:1px solid #3a5049;background:#0b1419}
.alignment-wrap canvas{width:100%;height:100%;display:block;cursor:zoom-in}
#expand{position:absolute;z-index:3;right:10px;top:10px;font-size:16px;line-height:1;padding:6px 9px;background:#0a1417cc;color:var(--mint);border-color:#4c6f62}
.stage-cta{position:absolute;z-index:4;left:50%;top:50%;transform:translate(-50%,-50%);display:flex;align-items:center;gap:12px;padding:12px 22px 12px 12px;border-radius:999px;font-size:15px;font-weight:600;background:#0a1417d9;border:1px solid #7eeac266;color:var(--text);backdrop-filter:blur(8px);box-shadow:0 20px 50px #0008}
.stage-cta span{display:grid;place-items:center;width:40px;height:40px;border-radius:50%;background:var(--mint);color:#0b2a20;font-size:15px}
.stage-cta:hover:not(:disabled){background:#0f2723e6;border-color:var(--mint)}
.stage.started .stage-cta{display:none}
.compare-controls{display:flex;gap:12px;align-items:center;padding:12px 14px 14px;font-size:13px;color:var(--muted);flex-wrap:wrap}
.compare-controls input{flex:1;min-width:80px}
.compare-controls output{min-width:36px;font-family:var(--mono);color:var(--mint)}
#image-quality{font-size:12px;color:var(--dim);margin-left:auto}
#source-retry{font-size:12px;padding:4px 10px}
input[type=range]{accent-color:var(--mint);cursor:pointer;height:4px}
input[type=range]:disabled{cursor:default}
.timeline{height:64px;display:flex;gap:16px;align-items:center;padding:0 20px;border-top:1px solid var(--line);background:#0c1418}
.timeline>button{flex:none;width:40px;height:40px;border:0;border-radius:50%;background:var(--mint);color:#0b2a20;padding:0;font-size:14px;box-shadow:0 6px 20px #7eeac233}
.timeline>button:hover{background:#9af3d3}
.timeline output,.timeline>span{font:13px var(--mono);color:#b9c9cb}
.timeline-track{position:relative;flex:1;min-width:40px;display:flex;align-items:center}
.timeline-track input{width:100%;margin:0}
#timeline-marks{position:absolute;inset:0;pointer-events:none}
.mark{position:absolute;top:50%;width:12px;height:12px;padding:0;border-radius:3px;transform:translate(-50%,-50%) rotate(45deg);background:var(--amber);border:2px solid #0c1418;pointer-events:auto;margin-top:-12px}
.mark::after{content:attr(data-label);position:absolute;bottom:14px;left:50%;transform:rotate(-45deg) translate(-30%,-4px);transform-origin:left;font-size:11px;white-space:nowrap;color:var(--amber);opacity:0;transition:opacity .15s;pointer-events:none}
.mark:hover::after,.mark:focus-visible::after{opacity:1}
.mark:hover{background:#ffd9a8}
.below-stage{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap;margin-top:18px}
.moment-row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.moment-row>span{font-size:13px;color:var(--muted);margin-right:4px}
.moment-row button{display:inline-flex;align-items:center;gap:10px;background:transparent;border-radius:999px;padding:6px 14px;font-size:13px}
.moment-row button .mono{color:var(--amber);font-size:12px}
.moment-row b{font-weight:500;color:#d4e1de}
.kbd-hint{font-size:12px;color:var(--dim)}

/* Precision */
.metric-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.metric-cards article{border:1px solid var(--line);border-top:2px solid #4d7e6d;border-radius:var(--radius);padding:26px 26px 24px;background:linear-gradient(150deg,#14261f,#0f181c 60%);display:flex;flex-direction:column;align-items:flex-start;gap:8px}
.metric-cards strong{font-size:clamp(34px,4vw,52px);letter-spacing:-.03em;font-weight:600;color:var(--mint);line-height:1.2}
.metric-cards article>span:last-child{font-size:14px;color:#c4d8d2}
.target-tag{font-size:11px;letter-spacing:.06em;color:var(--amber);border:1px solid #6a5c45;padding:2px 9px;border-radius:999px}
.target-tag.measured{color:var(--mint);border-color:#3e6253}
.footnote{color:var(--dim);font-size:13px;margin:20px 0 0}

/* How it works */
.concept{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.6fr);gap:clamp(32px,6vw,90px);align-items:start}
.concept-copy h2{font-size:clamp(28px,3vw,40px);margin:14px 0 18px}
.concept-copy p{font-size:15px;color:var(--muted);max-width:420px;line-height:1.9;margin:0 0 26px}
.flow{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:14px;counter-reset:step}
.flow li{position:relative;padding:22px 20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel)}
.flow li:not(:last-child)::after{content:"→";position:absolute;right:-13px;top:24px;z-index:1;font-size:14px;color:var(--mint);background:var(--bg);width:14px;text-align:center}
.flow span{font:600 12px var(--mono);color:var(--mint)}
.flow h3{font-size:19px;margin:10px 0 8px}
.flow p{font-size:13px;color:var(--muted);margin:0;line-height:1.75}

/* Footer */
.site-footer{border-top:1px solid var(--line);margin-top:20px}
.footer-inner{max-width:1480px;margin:auto;padding:28px var(--gutter) 40px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:12px;letter-spacing:.08em;color:var(--dim)}
.brand-sm{color:#c9d8d4;letter-spacing:.16em}

/* Detail dialog */
dialog{width:min(1180px,94vw);max-height:94vh;background:#0f1a1f;color:var(--text);border:1px solid #4a6459;border-radius:18px;padding:24px;box-shadow:0 30px 100px #000b}
dialog::backdrop{background:#050b10e0;backdrop-filter:blur(8px)}
.detail-top{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:18px}
.detail-top h2{font-size:22px;margin-top:6px}
.detail-canvas{width:100%;height:min(62vh,680px);background:#071014;position:relative;overflow:hidden;border:1px solid #38534a;border-radius:10px}
.detail-canvas canvas{width:100%;height:100%;display:block;cursor:grab;touch-action:none}
.detail-canvas canvas:active:active{cursor:grabbing}
.detail-controls{display:flex;gap:28px;margin:18px 0 8px;align-items:center}
.detail-controls label{display:flex;gap:14px;align-items:center;flex:1;font-size:13px;white-space:nowrap}
.detail-controls input{flex:1;min-width:40px}
dialog>p{color:var(--muted);font-size:13px;margin-bottom:0}

/* Responsive */
@media(max-width:1180px){.hero-stats{grid-template-columns:repeat(2,auto)}.flow{grid-template-columns:1fr 1fr}.flow li:nth-child(2)::after{display:none}.stage-top-end{display:none}.map-hint{display:none}}
@media(max-width:980px){
 nav{display:none}
 .hero{grid-template-columns:1fr}
 .hero-visual{order:-1}
 .three-views{grid-template-columns:1fr}
 .spatial{border-right:0;border-bottom:1px solid var(--line)}
 .map-panel{min-height:0;flex:none;height:min(70vw,420px)}
 .alignment-wrap{flex:none}
 .concept{grid-template-columns:1fr}
}
@media(max-width:640px){
 body{font-size:14px}
 .header-inner{height:56px}
 .brand{font-size:13px;letter-spacing:.1em}
 .hero{padding-top:28px}
 .hero-actions .button{flex:1;justify-content:center}
 .hero-stats{gap:14px 24px}
 .hero-stats dd{font-size:22px}
 .section-heading{display:block}
 .stage{border-radius:12px;margin:0 calc(var(--gutter)*-.5)}
 .stage-top{padding:0 12px;font-size:12px}
 .map-panel{height:78vw}
 .map-toolbar-top{flex-wrap:wrap}
 .map-toolbar-top>.panel-tag{display:none}
 .map-tools{flex-wrap:wrap}
 .map-tools select{max-width:130px}
 #map-expand{display:none}
 .views-top{flex-wrap:wrap}
 .views-top .panel-tag{width:100%}
 .alignment-wrap{margin:0 10px}
 .stage-cta{font-size:13px;padding:8px 16px 8px 8px}.stage-cta span{width:32px;height:32px}
 .timeline{gap:10px;padding:0 12px;height:58px}
 .timeline>span{display:none}
 .kbd-hint{display:none}
 .metric-cards{grid-template-columns:1fr;gap:10px}
 .metric-cards article{padding:18px}
 .flow{grid-template-columns:1fr}.flow li::after{display:none}
 dialog{padding:14px}.detail-top h2{font-size:17px}.detail-canvas{height:48vh}
 .detail-controls{flex-wrap:wrap;gap:12px}.detail-controls label{min-width:100%}.detail-controls button{width:100%}
 .align-label{font-size:11px;padding:3px 7px}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.hero-render,.hero-seam,.stage-top .live i{animation:none!important}}