:root{--text:#1f2329;--body:#5f646d;--muted:#8b909a;--border:#e5e6ea;--panel:#ffffff;--bg:#f5f6f8;--accent:#4f46e5;--accent-dark:#4338ca;--accent-soft:#eef0fe;--maxw:1040px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--panel);line-height:1.65;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}h1,h2,h3{line-height:1.3;font-weight:700}.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}.sprite{display:none}.icon{width:1em;height:1em;flex:none;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid transparent;border-radius:6px;padding:10px 18px;font-size:14px;font-weight:600;font-family:inherit;cursor:pointer;transition:background 0.15s,border-color 0.15s,color 0.15s}.btn .icon{width:16px;height:16px}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-dark)}.btn-outline{background:#fff;color:var(--text);border-color:var(--border)}.btn-outline:hover{border-color:#c9ccd3}.btn-sm{padding:8px 14px;font-size:13px}.btn-dl{flex-direction:column;align-items:flex-start;gap:0;min-width:190px;padding:12px 20px}.btn-dl .btn-main{font-size:15px;font-weight:600}.btn-dl .btn-sub{font-size:12.5px;font-weight:400;opacity:0.85}.btn.is-missing{background:var(--bg);border-color:var(--border);color:var(--muted);cursor:not-allowed}.site-header{position:sticky;top:0;z-index:100;background:var(--panel);border-bottom:1px solid var(--border)}.header{display:flex;align-items:center;justify-content:space-between;gap:20px;height:60px}.logo{display:flex;align-items:center;gap:9px;font-size:17px;font-weight:700;flex:none}.logo-ico{width:28px;height:28px;flex:none}.hero{padding:44px 0 48px}.hero h1{font-size:clamp(28px,3.6vw,40px);margin-bottom:12px}.lead{font-size:16px;max-width:30em;color:var(--body)}.hero-cta{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}.note{margin-top:14px;font-size:13.5px;color:var(--body);max-width:46em}.note[hidden]{display:none}.note + .note{margin-top:6px}.note a{color:var(--accent)}.note a:hover{text-decoration:underline}section{padding:44px 0}.sec-head{max-width:720px;margin:0 0 30px}.sec-head h2{font-size:clamp(24px,3vw,32px);margin-bottom:8px}.sec-head p{color:var(--body);font-size:15.5px}.highlights{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;list-style:none}.highlight{padding:18px;background:var(--panel);border:1px solid var(--border);border-radius:10px}.highlight h3{font-size:15.5px;margin-bottom:4px}.highlight p{font-size:13.5px;color:var(--body)}footer{padding:30px 0;border-top:1px solid var(--border)}.foot{display:flex;align-items:center;justify-content:space-between;gap:30px;flex-wrap:wrap}.foot-brand{display:flex;align-items:center;gap:9px;font-size:16px;font-weight:700}.foot-brand .logo-ico{width:26px;height:26px}.foot-nav{display:flex;gap:24px;font-size:14px;color:var(--body)}.foot-nav a:hover{color:var(--text)}.foot-note{margin-top:14px;font-size:12.5px;color:var(--muted)}@media (max-width:900px){.highlights{grid-template-columns:repeat(2,1fr)}}@media (max-width:600px){section{padding:34px 0}.hero{padding:32px 0 36px}.hero-cta{flex-direction:column;align-items:stretch}.btn-dl{min-width:0}.highlights{grid-template-columns:1fr}}