:root {
  color-scheme:light;
  --bg:#faf6f0; --surface:#fffdf9; --surface-low:#f4efe7; --surface-high:#ece7dd;
  --primary:#4a7c59; --primary-strong:#376847; --primary-soft:#dce8dc;
  --accent:#705c30; --accent-soft:#efe2c6; --ink:#2d312e; --muted:#6f716c;
  --line:#dddcd3; --grid:rgba(74,124,89,.12); --shadow:0 4px 20px rgba(46,50,48,.06);
  --header:rgba(250,246,240,.88); --raw:#b67b3c; --clean:#376847; --vehicle:#2d312e;
  --display:"Literata","Songti SC","STSong",serif;
  --body:"Nunito Sans","PingFang SC","Microsoft YaHei",sans-serif;
  --mono:"JetBrains Mono","SFMono-Regular",Consolas,monospace;
}
html[data-theme="dark"] {
  color-scheme:dark;
  --bg:#101223; --surface:#1c1e30; --surface-low:#181a2c; --surface-high:#27293b;
  --primary:#bbc3ff; --primary-strong:#e0e0fa; --primary-soft:rgba(187,195,255,.12);
  --accent:#40e56c; --accent-soft:rgba(64,229,108,.09); --ink:#e0e0fa; --muted:#a7a8bd;
  --line:#444656; --grid:rgba(187,195,255,.08); --shadow:0 14px 40px rgba(0,0,0,.22);
  --header:rgba(16,18,35,.88); --raw:#ffbf69; --clean:#40e56c; --vehicle:#e0e0fa;
}
*{box-sizing:border-box} html{scroll-behavior:smooth;scroll-padding-top:90px} body{margin:0;color:var(--ink);background:var(--bg);font-family:var(--body);line-height:1.65;text-rendering:optimizeLegibility} a{color:inherit} button{font:inherit} :focus-visible{outline:3px solid color-mix(in srgb,var(--primary) 55%,transparent);outline-offset:3px}.skip-link{position:fixed;z-index:100;left:16px;top:-60px;padding:10px 14px;border-radius:10px;color:var(--surface);background:var(--primary-strong)}.skip-link:focus{top:16px}
.site-header{position:sticky;z-index:50;top:0;border-bottom:1px solid color-mix(in srgb,var(--line) 72%,transparent);background:var(--header);backdrop-filter:blur(18px)}.header-inner{width:min(1180px,calc(100% - 40px));height:72px;margin:auto;display:flex;align-items:center;gap:42px}.wordmark{font:700 27px/1 var(--display);letter-spacing:-1.2px;text-decoration:none}.wordmark span{color:var(--primary)}nav{display:flex;gap:28px;margin-left:auto}nav a{color:var(--muted);font-size:14px;font-weight:700;text-decoration:none}nav a:hover{color:var(--ink)}.header-actions{display:flex;align-items:center;gap:10px}.segmented{display:flex;padding:3px;border:1px solid var(--line);border-radius:10px;background:var(--surface-low)}.segmented button{min-width:34px;height:28px;padding:0 7px;border:0;border-radius:7px;color:var(--muted);background:transparent;font-size:11px;font-weight:800;cursor:pointer}.segmented button[aria-pressed="true"]{color:var(--ink);background:var(--surface);box-shadow:0 1px 4px rgba(0,0,0,.08)}.icon-button{width:38px;height:38px;display:grid;place-items:center;border:1px solid var(--line);border-radius:10px;color:var(--ink);background:var(--surface);cursor:pointer}.icon-button svg{width:17px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}.theme-moon{display:none}html[data-theme="dark"] .theme-moon{display:block}html[data-theme="dark"] .theme-sun{display:none}
.hero{width:min(1180px,calc(100% - 40px));min-height:680px;margin:auto;display:grid;grid-template-columns:minmax(0,1.03fr) minmax(430px,.97fr);align-items:center;gap:64px;padding:72px 0 92px}.eyebrow,.section-index{margin:0 0 20px;color:var(--primary);font:800 11px/1.3 var(--mono);letter-spacing:.14em;text-transform:uppercase}.eyebrow{display:flex;align-items:center;gap:9px;text-transform:none}.eyebrow>span{width:7px;height:7px;border-radius:50%;background:var(--primary);box-shadow:0 0 0 5px var(--primary-soft)}h1{max-width:680px;margin:0;font:600 clamp(50px,6vw,80px)/1.05 var(--display);letter-spacing:-.052em}h1 em{color:var(--primary);font-style:italic}.hero-lead{max-width:650px;margin:28px 0 0;color:var(--muted);font-size:18px;line-height:1.82}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:34px}.button{min-height:46px;display:inline-flex;align-items:center;justify-content:center;padding:0 20px;border:1px solid transparent;border-radius:10px;font-size:14px;font-weight:800;text-decoration:none;transition:transform .18s ease-out,border-color .18s ease-out,background .18s ease-out}.button:hover{transform:translateY(-2px)}.button-primary{color:#fff;background:var(--primary-strong)}html[data-theme="dark"] .button-primary{color:#101223;background:var(--primary)}.button-secondary{border-color:var(--line);background:var(--surface)}.button-secondary:hover{border-color:var(--primary)}.hero-tags{display:flex;flex-wrap:wrap;gap:8px;margin:26px 0 0;padding:0;list-style:none}.hero-tags li{padding:7px 10px;border:1px solid var(--line);border-radius:999px;color:var(--muted);background:var(--surface-low);font-size:12px;font-weight:700}
.hero-visual{position:relative;overflow:hidden;border:1px solid var(--line);border-radius:12px;background:var(--surface-low);box-shadow:var(--shadow)}.visual-head{height:58px;display:flex;align-items:center;justify-content:space-between;padding:0 20px;border-bottom:1px solid var(--line);font-size:12px;font-weight:800}.live-pill{display:inline-flex;align-items:center;gap:7px;padding:6px 9px;border-radius:999px;color:var(--primary-strong);background:var(--primary-soft);font:700 10px var(--mono)}.live-pill i{width:6px;height:6px;border-radius:50%;background:currentColor}.hero-visual svg{display:block;width:100%;height:auto;min-height:360px}.map-grid-line{fill:none;stroke:var(--grid);stroke-width:1}.road{fill:none;stroke:var(--line);stroke-width:18;stroke-linecap:round}.route{fill:none;stroke-linecap:round}.route.raw{stroke:var(--raw);stroke-width:2;stroke-dasharray:5 8}.route.clean{stroke:var(--clean);stroke-width:4}.raw-points circle{fill:var(--raw);stroke:var(--surface);stroke-width:2}.vehicle{fill:var(--clean);stroke:var(--surface);stroke-width:4}.visual-stats{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line)}.visual-stats div{padding:16px 18px;border-right:1px solid var(--line)}.visual-stats div:last-child{border-right:0}.visual-stats span{display:block;color:var(--muted);font-size:10px;font-weight:800}.visual-stats strong{display:block;margin-top:5px;font:700 16px var(--mono)}.sample-note{position:absolute;right:16px;top:72px;margin:0;padding:5px 8px;border-radius:7px;color:var(--muted);background:color-mix(in srgb,var(--surface) 86%,transparent);font:700 9px var(--mono)}
.section{padding:104px max(20px,calc((100% - 1180px)/2))}.section-heading{display:grid;grid-template-columns:1.25fr .75fr;gap:64px;align-items:end;margin-bottom:42px}.section-heading h2,.connect h2{margin:0;font:600 clamp(34px,4.2vw,53px)/1.15 var(--display);letter-spacing:-.035em}.section-heading>p{max-width:470px;margin:0;color:var(--muted)}.proof{border-block:1px solid var(--line);background:var(--surface-low)}.scenario-tabs{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-bottom:0;border-radius:12px 12px 0 0;overflow:hidden}.scenario-tabs button{min-height:96px;display:grid;grid-template-columns:auto 1fr;grid-template-rows:1fr 1fr;column-gap:13px;padding:18px 20px;border:0;border-right:1px solid var(--line);color:var(--ink);background:var(--surface);text-align:left;cursor:pointer}.scenario-tabs button:last-child{border-right:0}.scenario-tabs button[aria-selected="true"]{background:var(--primary-soft)}.scenario-tabs span{grid-row:1/3;color:var(--primary);font:700 11px var(--mono)}.scenario-tabs strong{font-size:15px}.scenario-tabs small{color:var(--muted)}.proof-stage{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(290px,.5fr);min-height:500px;border:1px solid var(--line);border-radius:0 0 12px 12px;overflow:hidden;background:var(--surface)}.proof-placeholder{display:flex;flex-direction:column;border-right:1px solid var(--line)}.placeholder-toolbar{height:54px;display:flex;align-items:center;justify-content:space-between;padding:0 18px;border-bottom:1px solid var(--line);color:var(--muted);font:700 10px var(--mono)}.placeholder-map{flex:1;display:grid;place-items:center;padding:32px;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:34px 34px;color:var(--muted);text-align:center}.proof-readout{padding:32px}.proof-readout h3{margin:0;font:600 27px/1.3 var(--display)}.proof-readout>p:not(.eyebrow){color:var(--muted)}.proof-readout dl{margin:30px 0 0}.proof-readout dl div{display:flex;align-items:end;justify-content:space-between;gap:16px;padding:14px 0;border-top:1px solid var(--line)}.proof-readout dt{color:var(--muted);font-size:12px}.proof-readout dd{margin:0;font:700 14px var(--mono)}
.capabilities{background:var(--bg)}.section-heading.compact{grid-template-columns:1fr}.capability-grid{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-left:1px solid var(--line)}.capability-grid article{min-height:270px;padding:26px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface)}.capability-grid article>span{color:var(--primary);font:700 11px var(--mono)}.capability-grid h3{margin:72px 0 10px;font:600 22px/1.35 var(--display)}.capability-grid p{margin:0;color:var(--muted);font-size:14px}.connect{display:grid;grid-template-columns:.65fr 1.35fr auto;gap:42px;align-items:center;border-top:1px solid var(--line);background:var(--surface-low)}.connect p:not(.section-index){max-width:650px;color:var(--muted)}footer{width:min(1180px,calc(100% - 40px));min-height:100px;margin:auto;display:flex;justify-content:space-between;align-items:center;gap:24px;color:var(--muted);font-size:11px}
@media(max-width:900px){.hero{grid-template-columns:1fr;padding-top:56px}.section-heading{grid-template-columns:1fr;gap:18px}.proof-stage{grid-template-columns:1fr}.proof-placeholder{min-height:430px;border-right:0;border-bottom:1px solid var(--line)}.connect{grid-template-columns:1fr;gap:18px}.connect .button{justify-self:start}.capability-grid{grid-template-columns:1fr 1fr}.capability-grid article:last-child{grid-column:1/-1}}
@media(max-width:640px){.header-inner{width:calc(100% - 28px);height:64px;gap:12px}.site-header nav{display:none}.header-actions{margin-left:auto}.hero{width:calc(100% - 28px);min-height:auto;padding:48px 0 68px;gap:42px}.hero h1{font-size:47px}.hero-lead{font-size:16px}.hero-actions .button{flex:1}.hero-visual svg{min-height:300px}.visual-stats div{padding:13px 10px}.visual-stats strong{font-size:13px}.section{padding:72px 14px}.scenario-tabs{grid-template-columns:1fr}.scenario-tabs button{min-height:78px;border-right:0;border-bottom:1px solid var(--line)}.scenario-tabs button:last-child{border-bottom:0}.proof-placeholder{min-height:350px}.capability-grid{grid-template-columns:1fr}.capability-grid article:last-child{grid-column:auto}.capability-grid article{min-height:220px}.capability-grid h3{margin-top:48px}footer{width:calc(100% - 28px);padding:28px 0;align-items:flex-start;flex-direction:column;gap:8px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important}}

/* Interactive proof panel. It remains fully functional when a map provider is unavailable. */
.proof-stage{min-height:560px}
.proof-map-panel{min-width:0;display:flex;flex-direction:column;border-right:1px solid var(--line)}
.proof-toolbar{min-height:56px;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:9px 16px;border-bottom:1px solid var(--line)}
.proof-legend{display:flex;flex-wrap:wrap;gap:14px;color:var(--muted);font-size:11px}
.proof-legend span{display:inline-flex;align-items:center;gap:7px}.proof-legend b{font-weight:700}
.proof-legend i{width:18px;height:3px;border-radius:4px;background:var(--raw)}
.proof-legend .legend-clean{height:4px;background:var(--clean)}
.proof-legend .legend-inferred{background:repeating-linear-gradient(90deg,var(--accent) 0 4px,transparent 4px 7px)}
.play-button{min-width:78px;height:36px;display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--line);border-radius:9px;color:var(--ink);background:var(--surface-low);font-size:12px;font-weight:800;cursor:pointer}
.play-button:hover{border-color:var(--primary)}.play-button b{font-weight:800}
.map-stage{position:relative;flex:1;min-height:440px;overflow:hidden;background:var(--surface-low)}
#baidu-map,#fallback-map{position:absolute;inset:0;width:100%;height:100%}
#baidu-map{z-index:1;opacity:0;transition:opacity .2s ease-out}
html[data-map-provider="baidu"] #baidu-map{opacity:1}
html[data-map-provider="baidu"] #fallback-map{opacity:0;pointer-events:none}
html[data-theme="dark"] #baidu-map{filter:brightness(.55) saturate(.7) hue-rotate(155deg)}
.proof-grid-line{fill:none;stroke:var(--grid);stroke-width:1}
.scenario-road{fill:none;stroke:var(--line);stroke-width:22;stroke-linecap:round;stroke-linejoin:round}
.scenario-route{fill:none;stroke-linecap:round;stroke-linejoin:round}.scenario-raw{stroke:var(--raw);stroke-width:3;stroke-dasharray:6 9}.scenario-clean{stroke:var(--clean);stroke-width:6}.scenario-inferred{stroke:var(--accent);stroke-width:7;stroke-dasharray:10 9}
.scenario-points circle{fill:var(--raw);stroke:var(--surface);stroke-width:3}.scenario-vehicle{fill:var(--clean);stroke:var(--surface);stroke-width:4}
.map-badge{position:absolute;z-index:4;top:14px;left:14px;display:inline-flex;align-items:center;gap:7px;padding:7px 10px;border:1px solid color-mix(in srgb,var(--line) 72%,transparent);border-radius:999px;color:var(--primary-strong);background:color-mix(in srgb,var(--surface) 90%,transparent);box-shadow:var(--shadow);font-size:10px;font-weight:800}
.map-badge i{width:6px;height:6px;border-radius:50%;background:currentColor}
.map-callout{position:absolute;z-index:4;right:14px;bottom:14px;max-width:min(340px,calc(100% - 28px));padding:10px 12px;border:1px solid color-mix(in srgb,var(--line) 72%,transparent);border-radius:9px;color:var(--ink);background:color-mix(in srgb,var(--surface) 92%,transparent);box-shadow:var(--shadow);font-size:12px;font-weight:700}
.timeline-row{min-height:54px;display:grid;grid-template-columns:auto minmax(80px,1fr) auto auto;align-items:center;gap:12px;padding:0 16px;border-top:1px solid var(--line);color:var(--muted);font:700 10px var(--mono)}
.timeline-track{height:4px;overflow:hidden;border-radius:99px;background:var(--surface-high)}.timeline-track i{display:block;width:0;height:100%;border-radius:inherit;background:var(--clean)}#timeline-time{min-width:90px;color:var(--ink);text-align:right}
@media(max-width:900px){.proof-map-panel{border-right:0;border-bottom:1px solid var(--line)}}
@media(max-width:640px){.proof-toolbar{align-items:flex-start;flex-direction:column}.play-button{width:100%}.map-stage{min-height:360px}.timeline-row{grid-template-columns:auto 1fr auto}.timeline-row output{grid-column:1/-1;min-width:0;text-align:center!important}}