:root{color-scheme:dark;--bg:#040817;--panel:rgb(12 20 43 / 82%);--line:rgb(125 151 211 / 22%);--text:#f5f8ff;--muted:#a6b3d0;--cyan:#22d3ee;--blue:#38bdf8;--purple:#8b5cf6;--green:#34d399}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;color:var(--text);background:radial-gradient(circle at 15% 10%,rgb(37 99 235 / 18%),transparent 28%),radial-gradient(circle at 88% 82%,rgb(6 182 212 / 16%),transparent 32%),linear-gradient(135deg,#020617,#071227 55%,#050817);font:16px/1.7 Inter,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit}.site-header{position:sticky;z-index:20;top:0;border-bottom:1px solid var(--line);background:rgb(4 8 23 / 86%);backdrop-filter:blur(18px)}.site-header-inner{width:min(1180px,calc(100% - 32px));min-height:72px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px}.site-brand img{display:block;width:176px;height:54px;object-fit:contain}.site-nav{display:flex;align-items:center;gap:22px}.site-nav a{text-decoration:none;color:var(--muted);font-size:14px;font-weight:700}.site-nav a:hover,.site-nav a[aria-current="page"]{color:#fff}.site-nav .nav-cta{padding:8px 14px;border:1px solid rgb(56 189 248 / 36%);border-radius:999px;color:#e0f2fe;background:rgb(14 165 233 / 12%)}main{width:min(1180px,calc(100% - 32px));margin:auto}.hero{padding:92px 0 64px;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(320px,.9fr);gap:54px;align-items:center}.eyebrow{color:var(--cyan);font-size:13px;font-weight:800;letter-spacing:.16em;text-transform:uppercase}.hero h1,.page-hero h1{margin:14px 0 20px;max-width:900px;font-size:clamp(38px,6vw,70px);line-height:1.08;letter-spacing:-.04em}.hero h1 em{color:var(--cyan);font-style:normal}.hero p,.page-hero p{max-width:760px;color:var(--muted);font-size:18px}.hero-actions{margin-top:28px;display:flex;gap:12px;flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 18px;border:1px solid var(--line);border-radius:11px;text-decoration:none;font-weight:800}.button.primary{border-color:transparent;background:linear-gradient(135deg,var(--purple),#0ea5e9);box-shadow:0 14px 38px rgb(14 165 233 / 20%)}.button.secondary{background:rgb(255 255 255 / 5%)}.hero-visual{min-height:340px;border:1px solid var(--line);border-radius:28px;background:url('/assets/a2a-data-stream-bg.webp') center/cover no-repeat;box-shadow:0 26px 80px rgb(0 0 0 / 45%);overflow:hidden;position:relative}.hero-visual:after{position:absolute;inset:0;content:"";background:linear-gradient(145deg,transparent,rgb(34 211 238 / 8%))}.page-hero{padding:82px 0 44px}.page-hero h1{font-size:clamp(38px,5vw,60px)}.section{padding:36px 0 58px}.section h2{margin:0 0 12px;font-size:clamp(28px,4vw,42px)}.section-lead{max-width:760px;margin:0 0 28px;color:var(--muted)}.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.card{padding:26px;border:1px solid var(--line);border-radius:18px;background:var(--panel);box-shadow:0 18px 55px rgb(0 0 0 / 22%);backdrop-filter:blur(14px)}.card h2,.card h3{margin:0 0 10px}.card p{margin:0;color:var(--muted)}.card strong{color:var(--cyan)}.content-layout{padding:24px 0 70px;display:grid;grid-template-columns:250px minmax(0,1fr);gap:34px}.toc{position:sticky;top:96px;height:max-content;padding:20px;border:1px solid var(--line);border-radius:16px;background:var(--panel)}.toc strong,.toc a{display:block}.toc a{margin-top:8px;color:var(--muted);text-decoration:none;font-size:14px}.prose{min-width:0}.prose section{padding:0 0 34px;scroll-margin-top:100px}.prose h2{margin:0 0 12px;font-size:28px}.prose h3{margin:24px 0 8px}.prose p,.prose li{color:var(--muted)}.prose ul,.prose ol{padding-left:22px}.notice{padding:18px 20px;border:1px solid rgb(56 189 248 / 30%);border-radius:14px;background:rgb(14 165 233 / 9%)}.metric-row{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.metric{padding:20px;border:1px solid var(--line);border-radius:14px;background:rgb(255 255 255 / 4%)}.metric strong,.metric span{display:block}.metric strong{font-size:24px;color:var(--cyan)}.metric span{color:var(--muted);font-size:13px}.site-footer{border-top:1px solid var(--line);background:rgb(2 6 23 / 60%)}.site-footer-inner{width:min(1180px,calc(100% - 32px));margin:auto;padding:32px 0;display:flex;justify-content:space-between;gap:24px}.site-footer p{margin:0;color:var(--muted);font-size:13px}.footer-links{display:flex;gap:16px;flex-wrap:wrap}.footer-links a{color:var(--muted);font-size:13px;text-decoration:none}.error-page{min-height:calc(100vh - 150px);display:grid;place-items:center;text-align:center}.error-page strong{display:block;color:var(--cyan);font-size:100px;line-height:1}.error-page h1{margin:18px 0 8px}.error-page p{color:var(--muted)}
@media(max-width:860px){.site-header-inner{padding:10px 0;align-items:flex-start;flex-direction:column;gap:8px}.site-nav{width:100%;gap:14px;overflow-x:auto}.site-nav a{white-space:nowrap}.hero{padding-top:58px;grid-template-columns:1fr}.hero-visual{min-height:260px}.card-grid{grid-template-columns:1fr 1fr}.content-layout{grid-template-columns:1fr}.toc{position:static}.metric-row{grid-template-columns:1fr 1fr}.site-footer-inner{flex-direction:column}}
@media(max-width:560px){.site-brand img{width:148px}.card-grid,.metric-row{grid-template-columns:1fr}.hero h1,.page-hero h1{font-size:38px}.hero{gap:30px}.site-nav{padding-bottom:4px}.site-footer-inner{padding-bottom:80px}}