/* 基础重置与排版 */
*{box-sizing:border-box}html{color-scheme:light dark}html,body{margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Inter,Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Noto Sans CJK SC","Microsoft YaHei","Noto Sans",sans-serif;line-height:1.6;color:#e8f1ff;background:
  radial-gradient(1200px 800px at 10% -10%,rgba(14,165,233,.18),rgba(2,6,23,0)),
  linear-gradient(180deg,#0b1026 0%,#0b142e 20%,#0a1e3a 50%,#0b2b4f 80%,#0f2e60 100%);
  background-attachment:fixed,fixed}
img{max-width:100%;display:block}
a{color:#7cc2ff;text-decoration:none}a:hover{text-decoration:underline}

/* 布局 */
.container{max-width:1120px;margin:0 auto;padding:0 20px}
.site-header{position:sticky;top:0;z-index:10;background:rgba(255,255,255,.8);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid rgba(0,0,0,.06)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:12px}
.brand-logo{height:36px;width:auto}
.brand-name{font-weight:700;font-size:20px;letter-spacing:.2px;position:relative;display:inline-block;background:linear-gradient(90deg,#0ea5e9,#7c3aed,#ef4444,#10b981,#2563eb);background-size:300% 100%;-webkit-background-clip:text;background-clip:text;color:transparent;animation:brandShift 8s linear infinite;text-shadow:0 1px 1px rgba(0,0,0,.25)}
.nav{display:flex;align-items:center;gap:18px}
.nav a{font-weight:600;color:#0b1220}
.lang-switch{display:flex;align-items:center;gap:6px;color:#6b7280}

/* Hero */
.hero{background:
  radial-gradient(1400px 680px at 20% -10%,rgba(11,16,38,.75) 0,rgba(255,255,255,1) 64%),
  conic-gradient(from 200deg at 10% -20%, rgba(15,23,42,.30), rgba(2,132,199,.20), rgba(56,189,248,.18), rgba(15,23,42,.30));
  padding:108px 0 72px;position:relative;overflow:hidden}
.hero:before{content:"";position:absolute;inset:-20% -10% auto -10%;height:60vh;filter:blur(70px) saturate(140%);background:radial-gradient(900px 300px at 20% 0,#0ea5e94d,#22d3ee33,#2563eb26,#ffffff00)}
.hero-canvas{position:absolute;inset:0;z-index:-1;pointer-events:none;width:100%;height:100%}
.hero:after{content:"";position:absolute;inset:-30% -10% -10% -30%;background:
  conic-gradient(from 0deg, #22d3ee66, #a78bfa55, #f472b655, #34d39955, #60a5fa55, #22d3ee66);
  mix-blend-mode:screen;opacity:.55;filter:blur(24px) hue-rotate(0deg);animation:heroSpin 22s linear infinite, heroHue 28s linear infinite}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:32px;align-items:center}
.hero h1{font-size:48px;line-height:1.15;margin:0 0 14px;color:#ffffff;text-shadow:0 2px 16px rgba(2,6,23,.25)}
.hero.in h1{animation:heroTitleBounce 900ms cubic-bezier(.2,.8,.2,1) 120ms both}
.hero .char{display:inline-block;animation:charColor 1600ms ease-in-out infinite}
.subtitle{font-size:18px;color:#f2f6ff;margin:0 0 20px}
.cta-group{display:flex;gap:12px;margin:8px 0 12px}
.btn{display:inline-block;padding:12px 20px;border-radius:9999px;font-weight:700}
.btn-primary{background:#0071e3;color:#fff;border:1px solid rgba(0,0,0,.06);box-shadow:0 10px 24px rgba(0,113,227,.35)}
.btn-primary:hover{transform:translateY(-1px);background:#005bb5;box-shadow:0 12px 28px rgba(0,91,181,.45)}
.btn-secondary{background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.22);color:#fff;box-shadow:0 8px 20px rgba(2,6,23,.25)}
.btn{transition:all .25s ease}
.badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.badge{background:#f3f4f6;border:1px solid #e5e7eb;color:#111827;padding:6px 10px;border-radius:999px;font-size:12px}
.hero-visual{position:relative;filter:drop-shadow(0 18px 40px rgba(31,92,255,.18))}
.hero-visual img{border-radius:18px;box-shadow:0 16px 48px rgba(2,6,23,.32),0 2px 8px rgba(2,6,23,.2);-webkit-box-reflect: below 8px linear-gradient(transparent, rgba(0,0,0,.12));transform:scale(1.03);transition:transform .2s cubic-bezier(.22,.61,.36,1)}
.hero:hover .hero-visual img{transform:scale(1.10)}
.hero-visual img.leaving{animation:heroLeaveShrink .2s ease-out}
.hero-visual:after{content:"";position:absolute;inset:-12% -18% -18% -18%;background:radial-gradient(60% 50% at 50% 10%,rgba(99,102,241,.28),rgba(59,130,246,.12),transparent);filter:blur(42px);z-index:-1}

/* Section */
.section{padding:56px 0}
.section.alt{background:transparent}
.section h2{font-size:28px;margin:0 0 22px}

/* Architecture card */
.hero-arch{background:#ffffff;border:1px solid rgba(0,0,0,.06);border-radius:20px;padding:12px;box-shadow:0 18px 36px rgba(2,6,23,.06)}

/* Features */
.features-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.feature-card{background:#ffffff;border:1px solid rgba(0,0,0,.06);border-radius:20px;padding:24px;box-shadow:0 18px 36px rgba(2,6,23,.06);transition:transform .25s ease,box-shadow .25s ease}
.feature-card:hover{box-shadow:0 26px 64px rgba(2,6,23,.16)}
.feature-card h3{margin:0 0 8px;font-size:18px;color:#0b1220;font-weight:600}
.feature-card p{margin:0;color:#374151}

/* Code */
.code-grid{display:grid;grid-template-columns:.9fr 1.3fr .8fr;gap:20px;align-items:start}
.code-card{background:radial-gradient(800px 300px at 10% -20%,#22d3ee3a,#2563eb22), #0a0f1f;color:#e0ecff;border-radius:14px;padding:16px;border:1px solid rgba(147,197,253,.18);box-shadow:0 10px 26px rgba(2,6,23,.45), inset 0 0 0 1px rgba(255,255,255,.02)}
.code-card h3{margin:0 0 8px;color:#a6c8ff}
.code-card pre{margin:0;overflow:auto;max-width:100%}
.code-card code{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;font-size:13px;white-space:pre-wrap;word-break:break-word}

/* Quickstart narrow width */
#quickstart .code-grid{max-width:1120px;margin:0 auto}

/* Reveal animations */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
.reveal.delay-1{transition-delay:.08s}
.reveal.delay-2{transition-delay:.16s}
.reveal.delay-3{transition-delay:.24s}
.reveal.delay-4{transition-delay:.32s}
.reveal.delay-5{transition-delay:.4s}

/* Topics */
.topics-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.topic-card{background:#fff;border:1px solid rgba(0,0,0,.06);border-radius:20px;padding:22px;box-shadow:0 12px 30px rgba(2,6,23,.06);color:#111827}
.topic-card h3{margin:0 0 6px;font-size:18px}
.topic-card p{margin:0;color:#4b5563}

/* Tech Specs */
.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.tech-card{background:#fff;border:1px solid rgba(0,0,0,.06);border-radius:20px;padding:22px;box-shadow:0 12px 30px rgba(2,6,23,.06);color:#111827}
.tech-card h3{margin:0 0 16px;font-size:18px}
.tech-card ul{margin:0;padding:0;list-style:none}
.tech-card li{margin:0 0 8px;color:#4b5563;font-size:14px;line-height:1.5}
.tech-card li:last-child{margin-bottom:0}

/* FAQ */
.faq-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.faq-card{background:#fff;border:1px solid rgba(0,0,0,.06);border-radius:16px;padding:16px 18px;box-shadow:0 8px 20px rgba(2,6,23,.06);color:#111827;transition:transform .2s ease,box-shadow .2s ease}
.faq-card:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(2,6,23,.12)}
.faq-card h3{margin:0 0 6px;font-size:16px;line-height:1.4}
.faq-card p{margin:0;color:#4b5563;font-size:13px;line-height:1.4}

/* Footer */
.site-footer{border-top:1px solid rgba(229,231,235,.5);background:transparent}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:18px 0}
.footer-brand{display:flex;align-items:center;gap:10px;color:#e8f1ff}
.footer-logo{height:24px}
.footer-links{display:flex;align-items:center;gap:14px;color:#d9e8ff}
.footer-links a{color:#d9e8ff}
.footer-meta{color:#c4d7ff;font-size:14px}

/* 响应式 */
@media (max-width: 960px){
  .hero-inner{grid-template-columns:1fr}
  .features-grid,.code-grid{grid-template-columns:1fr}
  .topics-grid{grid-template-columns:1fr}
  .faq-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width: 640px){
  .features-grid,.code-grid{grid-template-columns:1fr}
  .header-inner{height:auto;padding:12px 0;gap:12px;flex-wrap:wrap}
  .topics-grid{grid-template-columns:1fr}
  .tech-grid{grid-template-columns:1fr}
  .faq-grid{grid-template-columns:1fr}
}

/* Keyframes */
@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}
@keyframes heroSpin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}
@keyframes heroHue{0%{filter:blur(24px) hue-rotate(0deg)}100%{filter:blur(24px) hue-rotate(360deg)}}
@keyframes brandShift{0%{background-position:0% 50%}100%{background-position:300% 50%}}
@keyframes heroLeaveShrink{0%{transform:scale(1.08)}100%{transform:scale(1.04)}}
@keyframes heroTitleBounce{0%{transform:scale(.92)}60%{transform:scale(1.06)}100%{transform:scale(1)}}
@keyframes charColor{0%{color:#ffffff}50%{color:#a5b4fc}100%{color:#ffffff}}