:root{--bg: #ffffff;--bg-soft: #f5f7fb;--ink: #0f172a;--muted: #5b6573;--line: #e6e9f0;--card: #f5f7fb;--panel: #ffffff;--brand: #0a84ff;--brand-2: #0040dd;--pill-bg: #eaf2ff;--pill-line: #d6e6ff;--nav-bg: rgba(255, 255, 255, .8);--radius: 16px;--shadow: 0 18px 48px -18px rgba(10, 60, 160, .35);--container: 1080px;--grad: linear-gradient(135deg, #2aa0ff 0%, #0a84ff 45%, #0040dd 100%);--hero-glow: #eaf3ff}@media(prefers-color-scheme:dark){:root:not([data-theme=light]){--bg: #0b0f17;--bg-soft: #121826;--ink: #eef2f8;--muted: #9aa6b8;--line: #232b3a;--card: #121826;--panel: #151c2b;--pill-bg: #11213d;--pill-line: #1d3556;--nav-bg: rgba(11, 15, 23, .72);--shadow: 0 18px 48px -18px rgba(0, 0, 0, .6);--hero-glow: #0e1830}}:root[data-theme=dark]{--bg: #0b0f17;--bg-soft: #121826;--ink: #eef2f8;--muted: #9aa6b8;--line: #232b3a;--card: #121826;--panel: #151c2b;--pill-bg: #11213d;--pill-line: #1d3556;--nav-bg: rgba(11, 15, 23, .72);--shadow: 0 18px 48px -18px rgba(0, 0, 0, .6);--hero-glow: #0e1830}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Sans,PingFang SC,Microsoft YaHei,sans-serif;color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased;transition:background .2s ease,color .2s ease}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:var(--container);margin:0 auto;padding:0 24px}section{padding:88px 0}h1,h2,h3{line-height:1.2;letter-spacing:-.02em;margin:0}.muted{color:var(--muted)}.nav{position:sticky;top:0;z-index:10;background:var(--nav-bg);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}.nav .container{display:flex;align-items:center;justify-content:space-between;height:60px}.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--ink)}.glyph{width:28px;height:28px;border-radius:8px;background:var(--grad);display:grid;place-items:center;color:#fff;font-weight:800;font-size:16px}.nav-right{display:flex;gap:18px;align-items:center}.nav-links{display:flex;gap:22px;align-items:center}.nav-links a{color:var(--muted);font-size:15px}.langsel{color:var(--muted);font-size:14px;display:flex;gap:10px;align-items:center}.langsel a.active{color:var(--ink);font-weight:600}.theme-toggle{background:var(--bg-soft);border:1px solid var(--line);color:var(--ink);width:34px;height:34px;border-radius:9px;cursor:pointer;font-size:15px}.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;font-weight:600;font-size:15px;border:1px solid transparent;cursor:pointer;transition:transform .08s ease}.btn:hover{text-decoration:none;transform:translateY(-1px)}.btn-primary{background:var(--grad);color:#fff;box-shadow:var(--shadow)}.btn-ghost{background:var(--panel);color:var(--ink);border-color:var(--line)}.hero{background:radial-gradient(1200px 480px at 50% -10%,var(--hero-glow) 0%,var(--bg) 60%);text-align:center;padding-top:72px}.pill{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--brand-2);background:var(--pill-bg);border:1px solid var(--pill-line);padding:6px 14px;border-radius:999px;font-weight:600}.hero h1{font-size:clamp(34px,5vw,56px);margin:22px 0 16px}.hero p.lead{font-size:clamp(17px,2.2vw,20px);color:var(--muted);max-width:660px;margin:0 auto 28px}.cta-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}.hero .sub{margin-top:14px;font-size:13px;color:var(--muted)}.mock{margin:56px auto 0;max-width:460px;text-align:left}.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px}.panel .head{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-bottom:12px}.panel .head .dir{margin-left:auto;font-size:12px;background:var(--bg-soft);border:1px solid var(--line);padding:2px 10px;border-radius:999px}.panel .src{color:var(--muted);font-size:15px}.panel .dst{font-size:22px;font-weight:600;margin-top:6px}.panel .reading{color:var(--brand-2);font-size:13px;margin-top:4px}.panel .bar{margin-top:14px;display:flex;gap:8px}.panel .key{font-size:12px;color:var(--muted);background:var(--bg-soft);border:1px solid var(--line);padding:4px 10px;border-radius:8px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px}.card .ico{width:40px;height:40px;border-radius:11px;background:var(--grad);display:grid;place-items:center;color:#fff;font-size:20px;margin-bottom:14px}.card h3{font-size:18px;margin-bottom:8px}.card p{color:var(--muted);font-size:15px;margin:0}.section-head{text-align:center;max-width:640px;margin:0 auto 48px}.section-head h2{font-size:clamp(26px,3.4vw,36px)}.section-head p{color:var(--muted);font-size:17px;margin-top:12px}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.step{text-align:center;padding:20px}.step .n{width:44px;height:44px;border-radius:50%;background:var(--pill-bg);color:var(--brand-2);font-weight:800;display:grid;place-items:center;margin:0 auto 14px}.alt{background:var(--bg-soft)}.plans{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;max-width:760px;margin:0 auto}.plan{border:1px solid var(--line);border-radius:var(--radius);padding:30px;background:var(--panel)}.plan.pro{border-color:var(--brand);box-shadow:var(--shadow);position:relative}.plan .tag{position:absolute;top:-12px;right:22px;background:var(--grad);color:#fff;font-size:12px;font-weight:700;padding:4px 12px;border-radius:999px}.plan h3{font-size:20px}.plan .price{font-size:34px;font-weight:800;margin:12px 0 4px}.plan ul{list-style:none;padding:0;margin:18px 0 24px}.plan li{padding:7px 0 7px 26px;position:relative;color:var(--muted)}.plan li:before{content:"✓";position:absolute;left:0;color:var(--brand);font-weight:800}.faq details{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:4px 18px;margin-bottom:12px}.faq summary{cursor:pointer;font-weight:600;padding:14px 0;list-style:none}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:"+";float:right;color:var(--muted);font-weight:400}.faq details[open] summary:after{content:"−"}.faq p{color:var(--muted);margin:0 0 14px}.dl-steps{padding-left:22px}.dl-steps li{margin-bottom:18px}.dl-steps li p{margin:0 0 8px}.cmd{background:var(--bg-soft);border:1px solid var(--line);border-radius:10px;padding:12px 14px;overflow-x:auto;margin:0 0 6px}.cmd code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px;color:var(--ink)}footer{border-top:1px solid var(--line);padding:40px 0;color:var(--muted);font-size:14px}footer .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px}footer a{color:var(--muted);margin-left:18px}.legal{max-width:760px}.legal h3{margin-top:28px}@media(max-width:820px){.grid,.steps,.plans{grid-template-columns:1fr}.nav-links{display:none}section{padding:60px 0}}