:root{--bg: #ffffff;--surface: #f5f5f5;--fg: #000000;--muted: #8c8c8c;--border: #dbdbdb;--accent: #4d6bfe;--accent-2: #73a3d2;--mono: "Fragment Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;--sans: "DM Sans", system-ui, -apple-system, "Segoe UI", "Helvetica Neue", Arial, sans-serif}@media (prefers-color-scheme: dark){:root{--bg: #0b0f1a;--surface: #111626;--fg: #e6e9ef;--muted: #8b93a5;--border: #2a3140;--accent: #6d86ff;--accent-2: #73a3d2}}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--fg);font-family:var(--sans);font-size:16px;line-height:1.65}:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}::selection{background:var(--accent);color:#ffffff}.skip-link{position:absolute;left:1rem;top:-3rem;z-index:100;background:var(--accent);color:#ffffff;padding:0.5rem 0.9rem;border-radius:8px;text-decoration:none;font-family:var(--mono);font-size:0.8rem;transition:top 0.15s ease}.skip-link:focus{top:1rem}.topnav{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:0.5rem 1rem;padding:0.7rem 1.6rem;border-bottom:1px solid var(--border);background:var(--bg);font-family:var(--mono);font-size:0.78rem;letter-spacing:0.08em;text-transform:uppercase;position:sticky;top:0;z-index:10}.topnav .brand{color:var(--fg);text-decoration:none;white-space:nowrap}.topnav .brand b{color:var(--accent);font-weight:400}.brand-logo{width:18px;height:18px;vertical-align:-4px;margin-right:0.35rem}.navlinks{display:flex;align-items:center;flex-wrap:wrap;gap:0.25rem 0}.topnav a{color:var(--muted);text-decoration:none;margin-left:1.3rem;transition:color 0.15s ease}.topnav a:hover{color:var(--fg);text-decoration:underline;text-underline-offset:3px}.topnav a[aria-current="page"]{color:var(--fg);border-bottom:2px solid var(--accent);padding-bottom:2px}.lang-toggle{margin-left:1.3rem;background:none;border:1px solid var(--border);border-radius:8px;color:var(--fg);font-family:var(--mono);font-size:0.75rem;line-height:1;padding:0.38rem 0.55rem;cursor:pointer;letter-spacing:0.05em;transition:border-color 0.15s ease}.lang-toggle:hover{border-color:var(--accent);color:var(--accent)}main{max-width:880px;margin:0 auto;padding:3rem 1.4rem 4rem}h1,h2,h3,h4{color:var(--fg)}h2{margin-top:3rem;padding-bottom:0.35rem;border-bottom:1px solid var(--border);font-size:1.4rem;font-weight:700;letter-spacing:-0.01em}a{color:var(--accent);text-decoration-thickness:1px;text-underline-offset:3px}a:hover{text-decoration:underline}blockquote{margin:1rem 0;padding:0.4rem 1rem;border-left:2px solid var(--accent-2);color:var(--muted)}img{max-width:100%}.hero{text-align:center;margin-bottom:2.5rem}.hero-logo{width:104px;height:104px}.hero h1{font-family:var(--sans);font-weight:700;font-size:clamp(2rem, 5vw, 2.9rem);line-height:1.15;letter-spacing:-0.02em;margin:0.9rem 0 1rem}.hero h1 em{color:var(--accent);font-style:normal}.hero .sub{color:var(--muted);font-size:1.02rem;margin:0.4rem auto 1.2rem;max-width:44rem}.installbar{display:flex;align-items:center;gap:0.9rem;max-width:620px;margin:1.6rem auto 0;padding:0.65rem 0.75rem 0.65rem 1.1rem;background:var(--surface);border:1px solid var(--border);border-radius:8px;font-family:var(--mono);font-size:0.9rem;color:var(--fg)}.installbar>span:first-child{flex:1 1 auto;overflow-x:auto;white-space:nowrap;scrollbar-width:none}.installbar>span:first-child::-webkit-scrollbar{display:none}.installbar .prompt{color:var(--accent-2);margin-right:0.5rem}.installbar .hint{color:var(--muted);font-size:0.72rem;letter-spacing:0.08em;text-transform:uppercase}.copy-btn{flex:0 0 auto;background:var(--accent);color:#ffffff;border:1px solid var(--accent);border-radius:8px;font-family:var(--mono);font-size:0.78rem;line-height:1;padding:0.5rem 0.85rem;cursor:pointer;transition:background 0.15s ease, border-color 0.15s ease}.copy-btn:hover{background:var(--accent);border-color:var(--accent);color:#ffffff}.copy-btn.copied{background:var(--accent);border-color:var(--accent);color:#ffffff}.termframe{margin:2rem auto;border:1px solid var(--border);border-radius:8px;overflow:hidden;background:var(--surface)}.termframe .termtitle,.demo-term .termtitle{padding:0.45rem 1rem;border-bottom:1px solid var(--border);font-family:var(--mono);font-size:0.72rem;letter-spacing:0.08em;color:var(--muted);text-transform:uppercase;text-align:left}.termframe img{display:block;width:100%}.termframe pre{margin:0;border:0;border-radius:0}pre{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:0.9rem 1.1rem;overflow-x:auto}pre,code{font-family:var(--mono)}code{background:var(--surface);color:var(--accent);font-size:0.88em;padding:0.1em 0.35em;border-radius:4px}pre code{background:transparent;color:var(--fg);padding:0}.card-grid{display:grid;grid-template-columns:repeat(auto-fit, minmax(250px, 1fr));gap:0.9rem;margin:1.6rem 0}.card{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:1rem 1.15rem;transition:border-color 0.15s ease}.card:hover{border-color:var(--accent)}.card h3{margin:0 0 0.45rem;color:var(--fg);font-size:0.98rem;font-family:var(--mono);font-weight:700;letter-spacing:0.01em}.card p:last-child{margin-bottom:0;color:var(--muted);font-size:0.9rem}table{border-collapse:collapse;width:100%}th,td{border:1px solid var(--border);padding:0.45rem 0.7rem;font-size:0.92rem}th{background:var(--surface);color:var(--fg);text-align:left}tr:nth-child(2n){background:var(--surface)}.reveal{opacity:0;transform:translateY(14px);transition:opacity 0.55s ease, transform 0.55s ease}.reveal.visible{opacity:1;transform:none}.card-grid .card:nth-child(2){transition-delay:0.06s}.card-grid .card:nth-child(3){transition-delay:0.12s}.card-grid .card:nth-child(4){transition-delay:0.18s}.card-grid .card:nth-child(5){transition-delay:0.06s}.card-grid .card:nth-child(6){transition-delay:0.12s}.card-grid .card:nth-child(7){transition-delay:0.18s}.card-grid .card:nth-child(8){transition-delay:0.24s}@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}.reveal{opacity:1;transform:none;transition:none}*{animation-duration:0.01ms !important;animation-iteration-count:1 !important}}[data-lang="en"] [data-l="zh"]{display:none}[data-lang="zh"] [data-l="en"]{display:none}.split{display:grid;grid-template-columns:minmax(0, 1fr) clamp(19rem, 32%, 26rem);gap:2.5rem;align-items:start;margin:2rem 0 1rem;width:min(1240px, calc(100vw - 2.8rem));margin-left:calc((100% - min(1240px, 100vw - 2.8rem)) / 2);--dy: clamp(0.85rem, 2vh, 1.4rem)}.split-term{position:sticky;top:var(--sticky-top, 4.5rem);min-height:calc(100vh - var(--sticky-top, 4.5rem));display:flex;align-items:flex-start;z-index:5}.demo-term{width:100%;container-type:inline-size;display:flex;flex-direction:column;aspect-ratio:920 / 650;border:1px solid var(--border);border-radius:8px;overflow:hidden;background:var(--surface);transform:translate3d(calc((1 - var(--p, 0)) * var(--dx, 0px)), calc((1 - var(--p, 0)) * var(--dy, 1rem)), 0) scale(calc(1 + (1 - var(--p, 0)) * 0.14));transform-origin:center center;will-change:transform;transition:opacity 0.16s ease}.demo-term.fading{opacity:0}#demo-body{flex:1 1 auto;min-height:0;padding:1rem 1.2rem;overflow:hidden;font-family:var(--mono);font-size:clamp(0.5rem, 1.82cqw, 0.92rem);line-height:1.55;transition:opacity 0.16s ease;color:var(--fg)}#demo-body.fading{opacity:0}#demo-body pre{margin:0;border:0;padding:0;background:transparent}.demo-pre{white-space:pre}#demo-body .scroll-cue{color:var(--muted)}#demo-body .scroll-cue .prompt{color:var(--accent-2);margin-right:0.5rem}#demo-body .cue-caret{color:var(--muted);animation:cue-blink 1.1s steps(2, start) infinite}@keyframes cue-blink{50%{opacity:0}}.demo-footer{margin-top:0.8rem;padding-top:0.6rem;border-top:1px solid var(--border);font-size:0.82em;white-space:pre}.split-sections{opacity:var(--sp, 0);padding-top:calc((1 - var(--p, 0)) * clamp(9rem, 16vh, 13rem));padding-bottom:45vh;pointer-events:none}.split-sections.is-visible{pointer-events:auto}.split-section{min-height:44vh;display:flex;flex-direction:column;justify-content:center;opacity:0.35;transition:opacity 0.22s ease}.split-section.is-active{opacity:1}.split-section h3{font-family:var(--sans);font-style:normal;font-weight:700;font-size:1.45rem;letter-spacing:-0.01em;margin:0 0 0.6rem}.split-section h3 em{color:var(--accent);font-style:normal}.split-section p{color:var(--muted);margin:0.25rem 0}.split-section p code{font-size:0.82em}.roadmap-grid{display:grid;grid-template-columns:repeat(auto-fit, minmax(240px, 1fr));gap:0.9rem;margin:1.6rem 0}@media (max-width: 760px){.split{grid-template-columns:1fr;width:100%;margin-left:0}.split-term{position:sticky;top:var(--sticky-top, 4px);min-height:0;z-index:1;background:var(--bg)}.split-sections{padding-top:0.5rem;padding-bottom:0}.split-section{min-height:0;padding:1.2rem 0;opacity:1}.demo-term{aspect-ratio:4 / 3}}.v-verse{margin:1.5rem 0 2rem}.v-title{font-family:var(--sans);font-weight:700;font-style:normal;font-size:1.4rem;text-align:center;letter-spacing:-0.01em;margin:0 0 0.6rem;border-bottom:0}.v-web-wrap{position:relative;width:100%;max-width:600px;margin:0 auto;aspect-ratio:600 / 320;overflow:hidden;border:1px solid var(--border);border-radius:8px;background:var(--bg)}.v-stars{position:relative;width:100%;height:100%}.v-star-wrapper{position:absolute}.v-star{position:absolute;transform:translate(-50%, -50%);display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--surface);border:1px solid var(--border);cursor:pointer;padding:0;font:inherit;transition:background 0.2s ease,border-color 0.2s ease,transform 0.2s cubic-bezier(0.22, 1, 0.36, 1)}.v-star:hover,.v-star.active{background:var(--accent);border-color:var(--accent);z-index:5}.v-star:hover{transform:translate(-50%, -50%) scale(1.08)}.v-star.active{transform:translate(-50%, -50%) scale(1.14)}.v-star:focus-visible{outline-offset:4px}.v-label{color:var(--fg);font-family:var(--mono);font-size:0.58rem;font-weight:700;letter-spacing:0;text-align:center;line-height:1.1;pointer-events:none;white-space:nowrap}.v-star:hover .v-label,.v-star.active .v-label{color:#ffffff}.v-tl-beam{display:block;width:100%;max-width:600px;margin:0 auto;height:40px;pointer-events:none}.v-tl-beam-path{fill:none;stroke:var(--accent);stroke-width:1.5;stroke-linecap:round;opacity:0;transition:opacity 0.3s ease}.v-tl-beam-path.v-tl-ready{opacity:0.7}.v-timeline{width:100%;max-width:600px;margin:0 auto;padding:0 0 0.5rem;position:relative}.v-timeline::before{content:'';position:absolute;top:50%;left:0;right:0;height:1px;background:var(--border)}.v-tl-dots{display:flex;justify-content:space-around;position:relative}.v-tl-dot{display:flex;flex-direction:column;align-items:center;gap:2px;cursor:pointer;background:none;border:none;padding:0;position:relative;font:inherit}.v-tl-rib{width:2px;height:20px;display:block}.v-tl-rib line{stroke:var(--border);stroke-width:2;stroke-linecap:round;transition:stroke 0.3s,y2 0.3s cubic-bezier(0.22, 1, 0.36, 1)}.v-tl-dot.active .v-tl-rib line{stroke:var(--accent)}.v-tl-ring{width:8px;height:8px;border-radius:50%;border:2px solid var(--border);background:var(--bg);transition:border-color 0.3s, background 0.3s}.v-tl-dot.active .v-tl-ring{border-color:var(--accent);background:var(--accent)}.v-tl-dot:hover .v-tl-ring{border-color:var(--accent)}.v-tl-label{font-family:var(--mono);font-size:0.58rem;color:var(--muted);white-space:nowrap;transition:color 0.3s}.v-tl-dot.active .v-tl-label{color:var(--accent)}.v-tl-dot:hover .v-tl-label{color:var(--fg)}.v-stage{margin-top:1rem;min-height:80px}.v-stage .roadmap-grid{display:grid;grid-template-columns:repeat(auto-fit, minmax(240px, 1fr));gap:0.9rem;margin:0}.v-reveal{animation:v-zoom-in 0.45s cubic-bezier(0.22, 1, 0.36, 1) both}@keyframes v-zoom-in{0%{opacity:0;transform:scale(0.985)}100%{opacity:1;transform:scale(1)}}footer{display:flex;justify-content:space-between;gap:0.5rem 1.5rem;flex-wrap:wrap;max-width:880px;margin:0 auto;padding:1.4rem;border-top:1px solid var(--border);color:var(--muted);font-family:var(--mono);font-size:0.78rem;letter-spacing:0.06em}footer a{color:var(--accent);text-decoration:none}footer a:hover{text-decoration:underline}@media (max-width: 700px){.nav-ext{display:none}}@media (max-width: 640px){main{padding:2rem 1.1rem 3rem}.topnav{padding:0.7rem 1.1rem;font-size:0.72rem}.topnav a{margin-left:0.9rem}.lang-toggle{margin-left:0.9rem}footer{flex-direction:column}}@media (max-width: 600px){.v-label{font-size:0.52rem}}