:root{--bg: #05060f;--bg-soft: #0b0e1e;--ink: #e8ecf8;--ink-dim: #9aa3c0;--accent: #6ea8ff;--card: rgba(13, 17, 36, .72);--card-line: rgba(140, 160, 220, .18);--mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Noto Sans SC,Microsoft YaHei,Helvetica Neue,sans-serif;line-height:1.9;overflow-x:hidden}::selection{background:var(--accent);color:#04050c}.act{position:relative}.act-stage{position:sticky;top:0;height:100vh;height:100svh;overflow:hidden;background:radial-gradient(1200px 800px at 50% 120%,color-mix(in srgb,var(--accent) 14%,transparent),transparent 70%),var(--bg)}.act-stage canvas{position:absolute;inset:0;width:100%;height:100%;display:block}.scene-static .act-stage canvas{display:none}.act-flow{position:relative;margin-top:-100vh;margin-top:-100svh;padding:12vh 0 18vh;pointer-events:none}.act-card{min-height:82vh;display:flex;align-items:center;padding:0 7vw;pointer-events:none}.act-card>.panel{pointer-events:auto;max-width:34rem;padding:2rem 2.2rem;border-radius:18px;background:var(--card);border:1px solid var(--card-line);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);box-shadow:0 24px 80px #00000073}.act-card.right{justify-content:flex-end}.act-card.center{justify-content:center;text-align:center}.act-card.center>.panel{max-width:40rem}.kicker{margin:0 0 .6rem;font-size:.82rem;letter-spacing:.35em;color:var(--accent);text-transform:uppercase}.act h2{margin:0 0 1rem;font-size:clamp(1.7rem,3.4vw,2.6rem);line-height:1.3;letter-spacing:.02em}.act p{margin:0 0 1em;color:var(--ink-dim);font-size:1.02rem}.act p strong,.act p em{color:var(--ink);font-style:normal}.act p em{border-bottom:1px solid color-mix(in srgb,var(--accent) 60%,transparent)}.code-chip{display:inline-block;padding:.1em .45em;border-radius:6px;background:#6ea8ff1f;border:1px solid rgba(110,168,255,.25);font-family:var(--mono);font-size:.86em;color:var(--ink)}.hero{position:relative;min-height:100vh;min-height:100svh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:0 6vw}.hero-title{margin:0;font-size:clamp(2.6rem,7vw,5.4rem);line-height:1.15;letter-spacing:.04em;background:linear-gradient(120deg,#cfe3ff 20%,var(--accent) 55%,#b78cff 85%);-webkit-background-clip:text;background-clip:text;color:transparent}.hero-sub{margin-top:1.4rem;max-width:36rem;color:var(--ink-dim);font-size:clamp(1rem,1.6vw,1.2rem)}.hero-input{margin-top:3rem;width:min(34rem,86vw);display:flex;align-items:center;gap:.8rem;padding:.9rem 1.2rem;border-radius:14px;background:var(--card);border:1px solid var(--card-line);backdrop-filter:blur(14px);font-family:var(--mono);text-align:left}.hero-input .prompt{color:var(--accent)}.hero-input .typed:after{content:"▌";animation:blink 1s steps(1) infinite;color:var(--accent)}@keyframes blink{50%{opacity:0}}.scroll-hint{position:absolute;bottom:4vh;left:50%;transform:translate(-50%);color:var(--ink-dim);font-size:.85rem;letter-spacing:.3em;animation:float 2.4s ease-in-out infinite}@keyframes float{50%{transform:translate(-50%,10px)}}.outro{position:relative;padding:22vh 7vw;text-align:center;background:radial-gradient(900px 500px at 50% 0%,rgba(110,168,255,.1),transparent 70%),var(--bg)}.outro h2{font-size:clamp(1.8rem,3.6vw,2.8rem);margin:0 0 1.2rem}.outro p{color:var(--ink-dim);max-width:40rem;margin:0 auto 1em}.outro-links{margin-top:2.6rem;display:flex;gap:1rem;justify-content:center;flex-wrap:wrap}.outro-links a{padding:.8rem 1.6rem;border-radius:999px;border:1px solid var(--card-line);background:var(--card);color:var(--ink);text-decoration:none;transition:border-color .2s,transform .2s}.outro-links a:hover{border-color:var(--accent);transform:translateY(-2px)}.site-foot{padding:3rem 7vw 4rem;text-align:center;color:var(--ink-dim);font-size:.85rem}.site-foot a{color:var(--ink-dim)}@media(max-width:640px){.act-card{padding:0 5vw;min-height:74vh}.act-card>.panel{padding:1.5rem 1.4rem}}.diagram{margin:1.2rem 0 .4rem;border-radius:12px;border:1px solid var(--card-line);background:#05060f80;padding:.9rem}.diagram svg{width:100%;height:auto;display:block}.principle{display:inline-block;margin-top:.4rem;padding:.25rem .8rem;border-radius:999px;font-size:.82rem;letter-spacing:.08em;color:var(--accent);border:1px solid color-mix(in srgb,var(--accent) 45%,transparent);background:color-mix(in srgb,var(--accent) 10%,transparent)}.src-coords{margin-top:1rem;font-size:.85rem;color:var(--ink-dim)}