:root{
  color-scheme: dark;
  --surface-0:#0b0c0e; --surface-1:#111316; --surface-2:#171a1d; --surface-3:#1e2125; --surface-4:#262a2f;
  --surface-inset:#08090b; --surface-overlay:#14171a;
  --border-subtle:#262a2f; --border-hairline:#30353b; --border-strong:#3c4249; --border-control:#78808a; --border-focus:#63c0ff;
  --text-primary:#eceff2; --text-secondary:#bcc3cb; --text-muted:#949ca6; --text-disabled:#78808a;
  --accent:#ff7a3d; --accent-hover:#ff8f5c; --accent-active:#f26a2b; --accent-subtle:#2b170d; --accent-border:#6b3418; --accent-text:#ff9463; --text-on-action:#170b04;
  --success:#3fcf7f; --danger:#ff6584;
  --score-excellent:#3fcf7f; --score-good:#a6d84b; --score-fair:#e3c04a; --score-poor:#ff6584;
  --shadow-overlay:0 8px 24px rgba(0,0,0,0.55);
  --sans:"Roboto",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"Roboto Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --ease:cubic-bezier(.2,0,0,1);
}
*{box-sizing:border-box}
html,body{background:var(--surface-0)}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body{margin:0;color:var(--text-primary);font-family:var(--sans);font-size:13px;line-height:20px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
:focus-visible{outline:2px solid var(--border-focus);outline-offset:2px}

/* ---------- scrollbar: hairline track, square thumb, accent only while dragging ---------- */
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--surface-0);border-left:1px solid var(--border-subtle)}
::-webkit-scrollbar-thumb{background:var(--border-strong);border:3px solid var(--surface-0);border-radius:0;min-height:40px}
::-webkit-scrollbar-thumb:hover{background:var(--border-control)}
::-webkit-scrollbar-thumb:active{background:var(--accent)}
::-webkit-scrollbar-corner{background:var(--surface-0)}
.card::-webkit-scrollbar-track,.code::-webkit-scrollbar-track{background:var(--surface-overlay)}
.card::-webkit-scrollbar-thumb,.code::-webkit-scrollbar-thumb{border-color:var(--surface-overlay)}
@supports (-moz-appearance:none){*{scrollbar-width:thin;scrollbar-color:var(--border-strong) var(--surface-0)}}
.mono{font-family:var(--mono)}
svg.i{width:16px;height:16px;flex:none;fill:none;stroke:currentColor;stroke-width:1.75;stroke-linecap:square;stroke-linejoin:miter}
svg.i.sm{width:14px;height:14px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;height:40px;padding:0 16px;border-radius:3px;font-size:14px;font-weight:500;white-space:nowrap;transition:background .12s var(--ease),border-color .12s var(--ease),color .12s var(--ease)}
.btn.primary{background:var(--accent);color:var(--text-on-action)}
.btn.primary:hover{background:var(--accent-hover)}
.btn.primary:active{background:var(--accent-active)}
.btn.ghost{border:1px solid var(--border-strong);color:var(--text-primary);background:rgba(11,12,14,.55)}
.btn.ghost:hover{background:var(--surface-3);border-color:var(--border-control)}
.btn.sm{height:32px;padding:0 12px;font-size:13px}

/* ---------- header ---------- */
.hdr{position:fixed;top:0;left:0;right:0;z-index:20;height:calc(56px + env(safe-area-inset-top,0px));padding-top:env(safe-area-inset-top,0px);padding-inline:24px;display:flex;align-items:center;gap:24px;border-bottom:1px solid transparent;transition:background .18s var(--ease),border-color .18s var(--ease)}
.hdr.solid{background:rgba(11,12,14,.88);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom-color:var(--border-hairline)}
.wm{font-family:var(--mono);font-weight:700;font-size:16px;letter-spacing:-.01em;display:inline-flex;align-items:baseline}
.wm .cur{color:var(--accent);animation:blink 1.1s steps(1) infinite}
@keyframes blink{50%{opacity:0}}
.nav{display:flex;gap:2px}
.nav a{height:32px;display:inline-flex;align-items:center;padding:0 10px;border-radius:3px;color:var(--text-secondary);font-family:var(--mono);font-size:12.5px;letter-spacing:.01em;transition:color .12s,background .12s}
.nav a:hover{color:var(--text-primary);background:var(--surface-2)}
.hdr-r{margin-left:auto;display:flex;align-items:center;gap:8px;position:relative}
.lang-btn{height:32px;display:inline-flex;align-items:center;gap:6px;padding:0 10px;border:1px solid var(--border-hairline);border-radius:3px;color:var(--text-secondary);font-family:var(--mono);font-size:12px;background:rgba(11,12,14,.5)}
.lang-btn:hover,.lang-btn[aria-expanded="true"]{color:var(--text-primary);border-color:var(--border-strong);background:var(--surface-2)}

/* language popover */
.lang-pop{position:absolute;top:44px;right:0;width:392px;max-width:calc(100vw - 32px);background:var(--surface-overlay);border:1px solid var(--border-strong);border-radius:4px;box-shadow:var(--shadow-overlay);padding:14px;z-index:30;opacity:0;transform:translateY(-4px);pointer-events:none;transition:opacity .15s var(--ease),transform .15s var(--ease)}
.lang-pop.on{opacity:1;transform:none;pointer-events:auto}
.lbl{font-family:var(--mono);font-size:11px;line-height:16px;letter-spacing:.08em;text-transform:uppercase;color:var(--text-muted)}
.lang-pop .lbl{display:flex;justify-content:space-between}
.map{display:block;width:100%;height:auto;margin:10px 0 12px;background:var(--surface-inset);border:1px solid var(--border-subtle)}
.map .land circle{fill:#4f565e}
.map .mk{cursor:pointer;outline:none}
.map .mk .dot{fill:var(--text-primary)}
.map .mk .ring{fill:none;stroke:transparent;stroke-width:1.5}
.map .mk:hover .ring{stroke:var(--border-control)}
.map .mk.on .dot{fill:var(--accent)}
.map .mk.on .ring{stroke:var(--accent)}
.map .mk .hit{fill:transparent}
.map .mk text{font-family:var(--mono);font-size:7px;fill:var(--text-secondary);opacity:0;transition:opacity .12s}
.map .mk:hover text,.map .mk.on text{opacity:1}
.lang-list{display:grid;grid-template-columns:1fr 1fr;gap:2px}
.lang-list button{height:32px;display:flex;align-items:center;justify-content:space-between;padding:0 10px;border-radius:3px;font-size:13px;color:var(--text-secondary);text-align:left}
.lang-list button:hover{background:var(--surface-3);color:var(--text-primary)}
.lang-list button[aria-checked="true"]{background:var(--surface-3);color:var(--text-primary);box-shadow:inset 2px 0 0 var(--accent)}
.lang-list .ltag{font-family:var(--mono);font-size:11px;color:var(--text-muted)}

/* ---------- stage ---------- */
.stage{position:relative;height:90vh;height:90svh;min-height:576px;overflow:hidden;background:var(--surface-0);isolation:isolate}
.stage canvas,.stage .ovl{position:absolute;inset:0;width:100%;height:100%;display:block}
#neb{z-index:0}
#fx{z-index:0;pointer-events:none}
#gl{z-index:1;cursor:grab;touch-action:pan-y}
#gl.grabbing{cursor:grabbing}
#gl.hot{cursor:pointer}
.ovl{z-index:2;pointer-events:none;overflow:visible}

.hero{position:absolute;left:48px;bottom:64px;z-index:3;max-width:720px;pointer-events:none}
.hero .eyebrow{display:flex;align-items:center;gap:10px;margin:0 0 18px}
.hero .eyebrow::before{content:"";width:8px;height:8px;border:1px solid var(--text-muted)}
h1{margin:0 0 20px;font-weight:300;font-size:clamp(36px,3.9vw,58px);line-height:1.06;letter-spacing:-.028em;text-shadow:0 0 28px rgba(11,12,14,.9)}
h1 .l1{display:block;color:var(--text-secondary)}
h1 .l2{display:block;color:var(--text-primary);font-weight:400}
h1 .caret{display:inline-block;width:.42em;height:.09em;margin-left:.06em;background:var(--accent);vertical-align:baseline;animation:blink 1.1s steps(1) infinite}
.hero p.sub{margin:0 0 28px;max-width:46ch;text-shadow:0 0 18px rgba(11,12,14,.95);font-size:15px;line-height:24px;color:var(--text-secondary)}
.cta{display:flex;flex-wrap:wrap;gap:10px;pointer-events:auto}
.stats{margin-top:22px;font-family:var(--mono);font-size:11.5px;color:var(--text-muted);letter-spacing:.02em;font-variant-numeric:tabular-nums}

/* controls */
.ctl{position:absolute;right:32px;bottom:40px;z-index:3;display:flex;align-items:center;gap:14px}
.hint{font-family:var(--mono);font-size:11px;color:var(--text-muted);letter-spacing:.02em}
.hint b{color:var(--text-secondary);font-weight:500}
.zoomv{font-family:var(--mono);font-size:11px;color:var(--text-secondary);min-width:44px;text-align:right;font-variant-numeric:tabular-nums}
.tools{display:flex;border:1px solid var(--border-hairline);border-radius:3px;background:rgba(17,19,22,.7)}
.tools button{width:32px;height:32px;display:grid;place-items:center;color:var(--text-secondary)}
.tools button+button{border-left:1px solid var(--border-hairline)}
.tools button:hover{background:var(--surface-3);color:var(--text-primary)}
.down{position:absolute;left:50%;bottom:28px;transform:translateX(-50%);z-index:3;width:32px;height:32px;display:grid;place-items:center;border:1px solid var(--border-hairline);border-radius:3px;color:var(--text-secondary);background:rgba(17,19,22,.6)}
.down:hover{color:var(--text-primary);background:var(--surface-3)}

/* reticle, feature ping, tooltip */
.ret,.feat{position:absolute;left:0;top:0;z-index:2;pointer-events:none;will-change:transform}
.ret{width:30px;height:30px;margin:-15px 0 0 -15px;opacity:0;transition:opacity .15s}
.ret.on{opacity:1}
.ret svg{width:30px;height:30px;stroke:var(--accent);stroke-width:1.6;fill:none;stroke-linecap:square}
.feat{opacity:0;transition:opacity .4s var(--ease)}
.feat.on{opacity:1}
.feat .ping{position:absolute;left:-11px;top:-11px;width:22px;height:22px;border:1px solid var(--text-secondary);animation:ping 2.4s var(--ease) infinite}
@keyframes ping{0%{transform:scale(.4);opacity:.9}70%{opacity:.15}100%{transform:scale(1.25);opacity:0}}
.feat .tag{position:absolute;left:18px;top:-30px;white-space:nowrap;display:flex;align-items:center;gap:8px;padding:0 8px;height:24px;border:1px solid var(--border-hairline);background:rgba(17,19,22,.82);font-family:var(--mono);font-size:11px;color:var(--text-secondary);pointer-events:auto;cursor:pointer}
.feat .tag:hover{border-color:var(--border-strong);color:var(--text-primary)}
.feat .tag::before{content:"";position:absolute;left:-12px;top:23px;width:13px;height:1px;background:var(--border-hairline);transform:rotate(-58deg);transform-origin:right}
.tip{position:absolute;left:0;top:0;z-index:4;pointer-events:none;display:none;gap:8px;align-items:center;height:24px;padding:0 8px;background:var(--surface-overlay);border:1px solid var(--border-strong);border-radius:4px;box-shadow:var(--shadow-overlay);font-family:var(--mono);font-size:11px;color:var(--text-primary);white-space:nowrap}
.tip.on{display:flex}
.tip .c{color:var(--text-muted)}

/* ---------- prompt card ---------- */
.card{position:absolute;right:160px;top:calc(50% + 20px);z-index:5;width:368px;max-height:calc(100% - 128px);overflow:auto;transform:translate(8px,-50%);opacity:0;pointer-events:none;background:var(--surface-overlay);border:1px solid var(--border-strong);border-radius:4px;box-shadow:var(--shadow-overlay);transition:opacity .18s var(--ease),transform .18s var(--ease)}
.card.on{opacity:1;transform:translate(0,-50%);pointer-events:auto}
.c-in{padding:16px}
.c-top{display:flex;align-items:center;justify-content:space-between;margin:-4px -6px 8px 0}
.c-x{width:28px;height:28px;display:grid;place-items:center;color:var(--text-muted);border-radius:3px}
.c-x:hover{background:var(--surface-3);color:var(--text-primary)}
.c-slug{display:flex;gap:8px;align-items:baseline;font-family:var(--mono);font-size:12.5px;color:var(--text-secondary);word-break:break-all}
.c-ver{color:var(--text-muted);flex:none}
.c-title{margin:6px 0 6px;font-size:18px;line-height:24px;font-weight:500;letter-spacing:-.01em}
.c-desc{margin:0 0 14px;color:var(--text-secondary)}
.c-score{display:flex;align-items:baseline;gap:10px;padding:12px 0;border-top:1px solid var(--border-hairline);border-bottom:1px solid var(--border-hairline)}
.c-num{font-family:var(--mono);font-weight:700;font-size:36px;line-height:36px;font-variant-numeric:tabular-nums}
.c-word{font-family:var(--mono);font-size:13px;font-weight:500}
.c-best{margin-left:auto;font-size:12px;color:var(--text-muted)}
.c-sec{padding:12px 0 0}
.mrow{display:grid;grid-template-columns:128px 1fr 28px;align-items:center;gap:10px;height:21px;font-family:var(--mono);font-size:12px}
.mrow .n{color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.mrow .bar{height:4px;background:var(--surface-4);position:relative}
.mrow .bar i{position:absolute;left:0;top:0;bottom:0;background:var(--text-secondary)}
.mrow .v{text-align:right;font-weight:500;font-variant-numeric:tabular-nums}
.c-lbl{margin-bottom:6px}
.c-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px 16px;padding:14px 0 0;margin-top:12px;border-top:1px solid var(--border-hairline)}
.c-val{font-size:13px;color:var(--text-primary);font-variant-numeric:tabular-nums}
.c-vars{display:flex;flex-wrap:wrap;gap:6px}
.pill{font-family:var(--mono);font-size:11.5px;line-height:18px;padding:1px 6px;border-radius:2px;background:var(--accent-subtle);border:1px solid var(--accent-border);color:var(--accent-text)}
.c-code{margin-top:14px;padding:8px 10px;background:var(--surface-inset);border:1px solid var(--border-subtle);font-family:var(--mono);font-size:11.5px;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.c-act{display:flex;gap:8px;margin-top:14px}
.c-act .btn{height:36px;font-size:13px}
.c-act .btn.primary{flex:1;justify-content:center}

/* ---------- section 2 ---------- */
.why{position:relative;border-top:1px solid var(--border-hairline);background-color:var(--surface-0);background-image:radial-gradient(circle,#1e2125 1px,transparent 1.3px);background-size:24px 24px;background-position:12px 12px}
.wrap{max-width:1280px;margin:0 auto;padding-inline:48px;padding-block:96px 72px}
.why h2{margin:14px 0 48px;max-width:20ch;font-weight:300;font-size:clamp(30px,3.4vw,44px);line-height:1.1;letter-spacing:-.022em;text-wrap:balance}
.pillars{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--border-hairline);border-bottom:1px solid var(--border-hairline);background:var(--surface-0)}
.pillars article{padding:24px 28px 28px;display:flex;flex-direction:column;gap:10px}
.pillars article+article{border-left:1px solid var(--border-hairline)}
.pillars .num{font-family:var(--mono);font-size:11px;color:var(--text-muted)}
.pillars h3{margin:0;font-size:20px;line-height:28px;font-weight:500;letter-spacing:-.01em}
.pillars p{margin:0;color:var(--text-secondary);font-size:14px;line-height:22px;max-width:38ch}
.viz{margin-top:auto;padding-top:18px}
.viz .box{background:var(--surface-inset);border:1px solid var(--border-subtle);padding:10px 12px;font-family:var(--mono);font-size:12px;line-height:20px;color:var(--text-secondary);min-height:102px}
.viz .hd{color:var(--text-muted);margin-bottom:4px;display:flex;justify-content:space-between}
.viz .add{color:var(--success)}
.viz .del{color:var(--danger)}
.viz .ok{color:var(--success)}
.viz .no{color:var(--danger)}
.viz .row{display:flex;gap:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pull{margin-top:48px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:10px 16px;align-items:center}
.pull .lbl{grid-column:1/-1}
.code{display:flex;align-items:center;height:48px;padding:0 16px;background:var(--surface-inset);border:1px solid var(--border-hairline);font-family:var(--mono);font-size:14px;color:var(--text-primary);overflow-x:auto;white-space:nowrap}
.code .k{color:var(--text-muted)}
.code .s{color:var(--accent-text)}
.faq{margin:72px auto 0;width:100%;max-width:710px}
.faq h2{margin:14px 0 32px}
.faq details{border-top:1px solid var(--border-hairline);background:var(--surface-0)}
.faq details:last-of-type{border-bottom:1px solid var(--border-hairline)}
.faq summary{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:18px 0;cursor:pointer;list-style:none;font-size:17px;line-height:24px;font-weight:500;letter-spacing:-.01em}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-family:var(--mono);color:var(--text-muted);font-weight:400}
.faq details[open] summary::after{content:"‘2"}
.faq summary:focus-visible{outline:1px solid var(--border-focus);outline-offset:2px}
.faq details p{margin:0 0 20px;max-width:68ch;color:var(--text-secondary);font-size:14px;line-height:22px}
.close{margin-top:72px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.close p{margin:0;font-size:clamp(22px,2.3vw,30px);line-height:1.25;font-weight:300;letter-spacing:-.015em;max-width:30ch}
.foot{border-top:1px solid var(--border-hairline);background:var(--surface-0)}
.foot .in{max-width:1280px;margin:0 auto;padding:18px 48px calc(18px + env(safe-area-inset-bottom,0px));display:flex;align-items:center;gap:20px;font-size:12px;color:var(--text-muted)}
.foot .wm{font-size:13px;color:var(--text-secondary)}
.foot .r{margin-left:auto;font-family:var(--mono);font-size:11px}

.nogl{position:absolute;inset:0;display:none;place-items:center;color:var(--text-muted);font-family:var(--mono);font-size:12px}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .hero{max-width:560px}
  .hint{display:none}
}
@media (max-width:760px){
  .hdr{padding-inline:16px;gap:12px}
  .nav,.signin{display:none}
  .stage::after{content:"";position:absolute;left:0;right:0;bottom:0;height:62%;z-index:2;pointer-events:none;background:linear-gradient(to bottom,rgba(11,12,14,0),rgba(11,12,14,.92) 46%)}
  .hero{left:16px;right:16px;bottom:28px;max-width:none}
  .hero .eyebrow{margin-bottom:12px}
  h1{margin-bottom:14px}
  .hero p.sub{font-size:14px;line-height:22px;margin-bottom:20px}
  .stats{margin-top:16px}
  .ctl{right:16px;bottom:auto;top:calc(68px + env(safe-area-inset-top,0px))}
  .zoomv{display:none}
  .down{display:none}
  .card{left:8px;right:8px;width:auto;top:auto;bottom:8px;max-height:64%;transform:translateY(12px)}
  .c-code,.c-varsec{display:none}
  .c-desc{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
  .card.on{transform:none}
  .wrap{padding-inline:16px;padding-block:64px 48px}
  .pillars{grid-template-columns:1fr}
  .pillars article{padding:22px 0 24px}
  .pillars article+article{border-left:0;border-top:1px solid var(--border-hairline)}
  .pull{grid-template-columns:1fr}
  .foot .in{padding-inline:16px;flex-wrap:wrap}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important}
}