:root{--bg: #ffffff;--surface: #f5f5f7;--surface-warm: #fbfbfd;--fg: #1d1d1f;--fg-2: #424245;--muted: #6e6e73;--meta: #86868b;--border: #d2d2d7;--border-soft: #e8e8ed;--accent: #0071e3;--accent-on: #ffffff;--accent-hover: #0077ed;--accent-active: #0066cc;--success: #16a34a;--warn: #eab308;--danger: #dc2626;--font-display: "SF Pro Display", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;--font-body: "SF Pro Text", "SF Pro Icons", "Helvetica Neue", Helvetica, Arial, sans-serif;--font-mono: "SF Mono", ui-monospace, "JetBrains Mono", Menlo, Monaco, Consolas, monospace;--text-xs: 12px;--text-sm: 14px;--text-base: 17px;--text-lg: 21px;--text-xl: 28px;--text-2xl: 40px;--text-3xl: 56px;--text-4xl: 80px;--leading-body: 1.47;--leading-tight: 1.05;--tracking-display: -.015em;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--space-12: 48px;--section-y-desktop: 100px;--section-y-tablet: 64px;--section-y-phone: 40px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 18px;--radius-pill: 980px;--elev-flat: none;--elev-ring: 0 0 0 1px var(--border);--elev-raised: 0 12px 32px rgba(0, 0, 0, .08);--focus-ring: 0 0 0 4px color-mix(in oklab, var(--accent), transparent 65%);--motion-fast: .15s;--motion-base: .22s;--ease-standard: cubic-bezier(.28, 0, .22, 1);--container-max: 1024px;--container-gutter-desktop: 22px;--container-gutter-tablet: 18px;--container-gutter-phone: 16px}*,*:before,*:after{box-sizing:border-box}html,body{margin:0}html{scroll-behavior:auto}body{font-family:var(--font-body),"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;font-size:var(--text-base);line-height:var(--leading-body);color:var(--fg);background:var(--bg);letter-spacing:-.011em;text-rendering:optimizeLegibility}body[data-page=home],body[data-page=autonomy]{background:#000}img{max-width:100%;display:block}button,input,select,textarea{font:inherit}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-active)}:focus-visible{outline:none;box-shadow:var(--focus-ring)}.skip{position:absolute;left:var(--space-3);top:-40px;z-index:80;background:var(--accent);color:var(--accent-on);padding:10px 16px;border-radius:var(--radius-sm)}.skip:focus{top:var(--space-3)}.container{width:min(var(--container-max),calc(100% - 2 * var(--container-gutter-desktop)));margin-inline:auto}.eyebrow{margin:0 0 var(--space-3);font-size:var(--text-xs);font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-family:var(--font-body)}h1,h2,h3{font-family:var(--font-display),"PingFang SC","Microsoft YaHei",sans-serif;letter-spacing:var(--tracking-display);font-weight:600;color:inherit;text-wrap:pretty}h1{font-size:clamp(32px,5vw,var(--text-3xl));line-height:1.07;margin:0 0 var(--space-5)}.stack-title{line-height:1.16}h2{font-size:clamp(28px,3.4vw,var(--text-2xl));line-height:1.1;margin:0 0 var(--space-4)}h3{font-size:var(--text-xl);line-height:1.14;margin:0 0 var(--space-3)}.lead{font-size:var(--text-lg);line-height:1.38;color:var(--muted);margin:0;max-width:38em;text-wrap:pretty}.lead-on-dark{color:color-mix(in oklab,white,transparent 22%)}.body-muted{color:var(--muted)}.body-sm{font-size:var(--text-sm);line-height:1.47}.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.04em}.btn-pill,.btn-pill-secondary,.btn-dark{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:8px 22px;border:0;border-radius:var(--radius-pill);font-family:var(--font-body);font-size:var(--text-sm);font-weight:600;cursor:pointer;text-decoration:none;transition:background var(--motion-fast) var(--ease-standard),color var(--motion-fast) var(--ease-standard),box-shadow var(--motion-fast) var(--ease-standard),transform var(--motion-fast) var(--ease-standard)}.btn-pill{background:var(--accent);color:var(--accent-on)}.btn-pill:hover{background:var(--accent-hover);color:var(--accent-on)}.btn-pill:active{background:var(--accent-active);color:var(--accent-on);transform:scale(.98)}.btn-pill:focus-visible{box-shadow:var(--focus-ring)}.btn-pill:disabled{opacity:.5;cursor:not-allowed}.btn-pill-secondary{background:transparent;color:#fff;box-shadow:inset 0 0 0 1px color-mix(in oklab,white,transparent 50%)}.btn-pill-secondary:hover{background:color-mix(in oklab,white,transparent 88%);color:#fff;box-shadow:inset 0 0 0 1px color-mix(in oklab,white,transparent 30%)}.btn-pill-secondary:active{transform:scale(.98);background:color-mix(in oklab,white,transparent 80%);color:#fff}.btn-dark{background:var(--fg);color:var(--bg)}.btn-dark:hover{background:color-mix(in oklab,var(--fg),white 12%);color:var(--bg)}.btn-dark:active{transform:scale(.98)}.hero-actions{display:flex;flex-wrap:wrap;gap:var(--space-3);margin-top:var(--space-8)}.text-link{color:var(--accent);font-weight:600;font-size:var(--text-sm);display:inline-flex;align-items:center;gap:6px}.text-link:after{content:"→";font-weight:400}.text-link:hover{color:var(--accent-active)}.theme-dark .text-link{color:color-mix(in oklab,var(--accent),white 28%)}.theme-dark .text-link:hover{color:#fff}.badge,.badge-muted{display:inline-flex;align-items:center;min-height:28px;padding:0 10px;border-radius:var(--radius-pill);font-size:var(--text-xs);font-weight:600;letter-spacing:.02em}.badge{background:var(--fg);color:var(--bg)}.badge-muted{background:transparent;color:var(--fg-2);box-shadow:inset 0 0 0 1px var(--border)}.nav{position:sticky;top:0;z-index:40;isolation:isolate;background:color-mix(in oklab,black,transparent 18%);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid color-mix(in oklab,white,transparent 88%)}.nav-inner{width:min(1120px,calc(100% - 2 * var(--container-gutter-desktop)));margin:0 auto;min-height:48px;display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);position:relative}.nav-brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;min-height:44px}.nav-brand:hover{color:#fff}.nav-logo{display:block;width:148px;height:32px;overflow:hidden;position:relative;flex:none}.nav-logo img{position:absolute;left:50%;top:50%;width:138%;max-width:none;height:auto;transform:translate(-50%,-50%);filter:grayscale(1) contrast(16) invert(1);mix-blend-mode:screen}.nav-links{display:flex;align-items:center;gap:2px}.nav-links a{color:color-mix(in oklab,white,transparent 18%);font-size:12px;font-weight:400;padding:12px 9px;min-height:44px;display:inline-flex;align-items:center;white-space:nowrap}.nav-links a:hover,.nav-links a.is-current{color:#fff}.nav-links a.is-current{font-weight:600}.nav-toggle{display:none;width:44px;height:44px;border:0;background:transparent;color:#fff;cursor:pointer;padding:0}.nav-toggle span,.nav-toggle span:before,.nav-toggle span:after{display:block;width:18px;height:1.5px;background:#fff;position:relative}.nav-toggle span:before,.nav-toggle span:after{content:"";position:absolute;left:0}.nav-toggle span:before{top:-6px}.nav-toggle span:after{top:6px}.band{padding:var(--section-y-desktop) 0}.band-tight{padding:56px 0}.band-black{background:#000;color:#fff}.band-surface{background:var(--surface);color:var(--fg)}.band-bg{background:var(--bg);color:var(--fg)}.band-warm{background:var(--surface-warm);color:var(--fg)}.closer{text-align:center}.closer p{margin:0 auto;max-width:28em;font-size:var(--text-lg);font-weight:600;font-family:var(--font-display),"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.35;letter-spacing:var(--tracking-display);text-wrap:pretty}.hero{position:relative;min-height:100dvh;color:#fff;overflow:hidden;display:grid;align-items:center;padding:72px 0 96px;background:#000}.hero-stage{position:absolute;top:0;right:0;bottom:0;left:0;pointer-events:none}.hero-stage .sky{position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(ellipse 70% 45% at 72% 38%,color-mix(in oklab,white,transparent 92%),transparent 70%),linear-gradient(180deg,#000,color-mix(in oklab,black,white 6%) 52%,#000)}.hero-stage .haze{position:absolute;left:50%;top:36%;width:90%;height:28%;transform:translate(-18%);background:radial-gradient(ellipse at 50% 50%,color-mix(in oklab,white,transparent 86%),transparent 70%)}.hero-stage .road{position:absolute;left:42%;top:46%;width:140%;height:90%;transform:translate(-20%) perspective(240px) rotateX(62deg);transform-origin:top center;background:linear-gradient(90deg,transparent 0 12%,color-mix(in oklab,white,transparent 93%) 12% 49.2%,color-mix(in oklab,white,transparent 55%) 49.2% 50.8%,color-mix(in oklab,white,transparent 93%) 50.8% 88%,transparent 88%),repeating-linear-gradient(90deg,transparent 0 9%,color-mix(in oklab,white,transparent 88%) 9% 9.35%,transparent 9.35% 18%);opacity:.45;-webkit-mask-image:linear-gradient(180deg,transparent 0%,black 18%,black 70%,transparent 100%);mask-image:linear-gradient(180deg,transparent 0%,black 18%,black 70%,transparent 100%)}.hero-stage .lamp{position:absolute;width:7px;height:7px;border-radius:50%;background:#fff;box-shadow:0 0 18px 6px color-mix(in oklab,white,transparent 40%);left:68%;top:44%}.hero-stage .lamp.b{left:71%;top:45%;width:5px;height:5px;opacity:.7}.hero-copy{position:relative;z-index:1;max-width:18em}.hero-caption{position:absolute;right:var(--space-6);bottom:var(--space-6);margin:0;font-size:10px;letter-spacing:.04em;color:color-mix(in oklab,white,transparent 28%);background:color-mix(in oklab,black,transparent 30%);padding:6px 10px;border-radius:5px}.stats{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid color-mix(in oklab,white,transparent 86%);border-bottom:1px solid color-mix(in oklab,white,transparent 86%)}.stat{padding:28px 8px;text-align:center}.stat+.stat{border-left:1px solid color-mix(in oklab,white,transparent 86%)}.stat .num{display:block;font-size:var(--text-2xl);font-weight:600;color:#fff;line-height:1}.stat span{display:block;margin-top:8px;font-size:var(--text-sm);color:color-mix(in oklab,white,transparent 30%)}.split-2{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-5)}.card,.card-feature{background:var(--bg);border-radius:28px;padding:36px 32px 32px;box-shadow:var(--elev-flat);transition:box-shadow var(--motion-base) var(--ease-standard),transform var(--motion-base) var(--ease-standard);color:inherit;text-decoration:none;display:block}.card-feature{min-height:280px}.card:hover,.card-feature:hover{box-shadow:var(--elev-raised);transform:translateY(-2px);color:inherit}.card h3,.card-feature h3{margin-top:4px}.card p,.card-feature p{margin:0 0 var(--space-6);color:var(--muted)}.partner-cloud{display:flex;flex-wrap:wrap;gap:10px 0}.partner-cloud span{font-size:var(--text-sm);color:var(--fg-2);padding:8px 14px 8px 0}.partner-cloud span:not(:last-child):after{content:"·";margin-left:14px;color:var(--meta)}.about-brand{margin-top:40px;width:min(540px,100%);height:120px;overflow:hidden;position:relative}.about-brand img{position:absolute;left:50%;top:50%;width:138%;max-width:none;height:auto;transform:translate(-50%,-50%);mix-blend-mode:multiply;filter:grayscale(1) contrast(16)}.wall{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--border-soft);border-radius:var(--radius-lg);overflow:hidden}.wall article{background:var(--bg);padding:28px 20px 24px;min-height:140px}.wall .num{font-size:28px;font-weight:600;display:block;margin-bottom:8px}.wall p{margin:0;font-size:var(--text-sm);color:var(--muted)}.principles{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-5)}.principles article{background:var(--bg);border-radius:var(--radius-lg);padding:28px 26px}.principles b{display:block;font-size:var(--text-xs);color:var(--muted);margin-bottom:10px;font-weight:600;letter-spacing:.08em}.table{width:100%;border-collapse:collapse;font-size:var(--text-base)}.table th,.table td{text-align:left;padding:16px 12px;border-bottom:1px solid var(--border-soft);vertical-align:top}.table th{font-size:var(--text-xs);font-weight:600;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;border-bottom:1px solid var(--border)}.table td:first-child{font-weight:600}.how{display:grid;grid-template-columns:1fr 1fr 1fr;gap:var(--space-6)}.how h3{font-size:var(--text-lg)}.how p{margin:0;color:var(--muted)}.modules{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-auto-rows:1fr;gap:var(--space-4);align-items:stretch}.modules article{background:var(--bg);border-radius:var(--radius-lg);padding:24px 22px 22px;box-shadow:var(--elev-ring);display:flex;flex-direction:column;min-height:200px;height:100%}.modules h3{font-size:var(--text-lg);margin:0 0 var(--space-3);flex:0 0 auto}.modules p{margin:0;color:var(--muted);font-size:var(--text-sm);line-height:1.47;flex:1 1 auto}.laws{counter-reset:law;display:grid;gap:1px;background:var(--border-soft);border-radius:var(--radius-lg);overflow:hidden;margin:0;padding:0}.laws li{list-style:none;background:var(--bg);padding:22px 24px 22px 72px;position:relative;color:var(--fg)}.laws li:before{counter-increment:law;content:counter(law);position:absolute;left:24px;top:22px;font-family:var(--font-mono);font-size:var(--text-lg);font-weight:600;color:var(--muted)}.dims{display:grid;grid-template-columns:repeat(7,1fr);gap:var(--space-2)}.dims span{display:flex;align-items:center;justify-content:center;min-height:64px;background:var(--bg);border-radius:var(--radius-md);font-size:var(--text-sm);font-weight:600;box-shadow:var(--elev-ring)}.chain{display:grid;grid-template-columns:1fr 1fr 1fr;gap:var(--space-4)}.chain article{background:color-mix(in oklab,black,white 16%);color:#fff;border-radius:var(--radius-lg);padding:28px 24px}.chain p{margin:8px 0 0;color:color-mix(in oklab,white,transparent 28%)}.roles{display:flex;flex-wrap:wrap;gap:8px}.roles span{min-height:36px;padding:8px 14px;border-radius:var(--radius-pill);background:var(--bg);box-shadow:var(--elev-ring);font-size:var(--text-sm)}.legend{display:flex;gap:var(--space-5);flex-wrap:wrap;margin:0 0 var(--space-6);padding:0;list-style:none}.legend li{display:flex;align-items:center;gap:8px;font-size:var(--text-sm);color:var(--muted)}.dot{width:8px;height:8px;border-radius:50%}.dot-g{background:var(--success)}.dot-y{background:var(--warn)}.dot-r{background:var(--danger)}.groups{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-8) var(--space-12)}.groups h3{font-size:var(--text-sm);color:var(--muted);letter-spacing:.06em;font-weight:600}.groups ul{margin:0;padding:0;list-style:none}.groups li{padding:10px 0;border-bottom:1px solid var(--border-soft);font-size:var(--text-base)}.coop{display:grid;grid-template-columns:1fr 1fr 1fr;gap:var(--space-4)}.coop article{background:var(--bg);border-radius:var(--radius-lg);padding:28px 24px;box-shadow:var(--elev-ring)}.coop p{margin:0;color:var(--muted);font-size:var(--text-sm)}.contact-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:var(--space-12);align-items:start}.facts dt{font-size:var(--text-xs);color:var(--muted);font-weight:600;letter-spacing:.06em;margin-top:18px}.facts dd{margin:4px 0 0}.field{display:flex;flex-direction:column;gap:6px;margin-bottom:var(--space-4)}.field label{font-size:var(--text-sm);font-weight:600;color:var(--fg-2)}.field input:not([type=radio]),.field textarea,.field select{min-height:44px;padding:10px 12px;border-radius:var(--radius-sm);border:1px solid var(--meta);background:var(--bg);color:var(--fg);transition:border-color var(--motion-fast) var(--ease-standard),box-shadow var(--motion-fast) var(--ease-standard)}.field textarea{min-height:120px;resize:vertical}.field input:not([type=radio])::placeholder,.field textarea::placeholder{color:var(--meta)}.field input:not([type=radio]):hover,.field textarea:hover,.field select:hover{border-color:var(--fg-2)}.field input:not([type=radio]):focus-visible,.field textarea:focus-visible,.field select:focus-visible{border-color:var(--accent);box-shadow:var(--focus-ring)}.choices{display:flex;flex-wrap:wrap;gap:8px;position:relative;overflow:visible}.choices label{position:relative;min-height:44px;padding:0 16px;border-radius:var(--radius-pill);box-shadow:inset 0 0 0 1px var(--border);display:inline-flex;align-items:center;cursor:pointer;font-size:var(--text-sm);font-weight:600;color:var(--fg);background:var(--bg)}.choices label:hover{box-shadow:inset 0 0 0 1px var(--fg-2);background:var(--surface);color:var(--fg)}.choices input{position:absolute;width:1px;height:1px;margin:-1px;padding:0;border:0;min-height:0;overflow:hidden;clip:rect(0,0,0,0);opacity:0;pointer-events:none}.choices label:has(input:checked){background:var(--fg);color:var(--bg);box-shadow:none}.choices label:has(input:checked):hover{background:color-mix(in oklab,var(--fg),white 10%);color:var(--bg)}.choices label:has(input:focus-visible){box-shadow:var(--focus-ring)}.form-msg{display:none;margin-top:var(--space-4);font-size:var(--text-sm);color:var(--fg-2)}.form-msg.is-on{display:block}.form-err{color:var(--danger);font-size:var(--text-sm);display:none;margin:0 0 var(--space-3)}.form-err.is-on{display:block}.site-footer{isolation:isolate;background:#000;color:color-mix(in oklab,white,transparent 22%);padding:48px 0 36px;font-size:var(--text-sm)}.site-footer .nav-brand{margin-bottom:var(--space-5)}.site-footer .nav-logo{width:180px;height:38px}.site-footer a{color:color-mix(in oklab,white,transparent 18%)}.site-footer a:hover{color:#fff}.foot-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:var(--space-8)}.foot-meta{margin:0;line-height:1.6}.foot-nav{display:flex;flex-wrap:wrap;gap:8px 16px;align-content:start}.foot-copy{margin-top:var(--space-8);padding-top:var(--space-4);border-top:1px solid color-mix(in oklab,white,transparent 88%);font-size:var(--text-xs);color:color-mix(in oklab,white,transparent 45%)}@media (max-width: 920px){.container,.nav-inner{width:min(var(--container-max),calc(100% - 2 * var(--container-gutter-phone)))}.band{padding:var(--section-y-phone) 0}.nav-toggle{display:inline-flex;align-items:center;justify-content:center}.nav-links{display:none;position:absolute;left:0;right:0;top:48px;background:color-mix(in oklab,black,transparent 4%);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);flex-direction:column;align-items:stretch;padding:8px 16px 20px;border-bottom:1px solid color-mix(in oklab,white,transparent 88%)}.nav-links.is-open{display:flex}.nav-links a{min-height:44px;font-size:var(--text-sm)}.split-2,.principles,.how,.modules,.chain,.coop,.contact-grid,.groups,.foot-grid{grid-template-columns:1fr}.modules{grid-template-columns:1fr;grid-auto-rows:auto}.modules article{min-height:0;height:auto}.stats{grid-template-columns:1fr}.stat+.stat{border-left:0;border-top:1px solid color-mix(in oklab,white,transparent 86%)}.wall,.dims{grid-template-columns:1fr 1fr}.hero-copy{max-width:none}.hero{min-height:92dvh;align-items:end;padding-bottom:72px}.hero-caption{left:var(--space-4);right:auto}.table thead{display:none}.table,.table tbody,.table tr,.table td{display:block;width:100%}.table tr{padding:16px 0;border-bottom:1px solid var(--border)}.table td{padding:4px 0 4px 7.5em;position:relative;border:0}.table td:before{position:absolute;left:0;top:4px;color:var(--muted);font-size:var(--text-xs);font-weight:600;letter-spacing:.06em}.table td:nth-child(1):before{content:"线路"}.table td:nth-child(2):before{content:"端点"}.table td:nth-child(3):before{content:"状态"}.table.proj td:nth-child(1):before{content:"项目"}.table.proj td:nth-child(2):before{content:"合作方"}.table.proj td:nth-child(3):before{content:"关键进展"}.card-feature{min-height:0}}@media (max-width: 640px){.wall{grid-template-columns:1fr}h1{font-size:32px}}@media (prefers-reduced-motion: reduce){*,*:before,*:after{transition:none!important}}main#content:focus{outline:none}main#content:focus-visible{box-shadow:none}