:root{color-scheme:dark;--bg: #171a21;--bg-elevated: #1e222c;--fg: #f5f6f8;--muted: #aab2c0;--accent: #e8442e;--accent-soft: rgba(232, 68, 46, .16);--gold: #f0b429;--line: rgba(245, 246, 248, .1);--max: 1080px;--font-sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;--font-display: "Syne", "PingFang SC", "Hiragino Sans GB", sans-serif;font-family:var(--font-sans);line-height:1.65;font-weight:400;color:var(--fg);background:var(--bg);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-width:320px;min-height:100vh;background:radial-gradient(900px 520px at 85% -8%,rgba(232,68,46,.22),transparent 55%),radial-gradient(700px 420px at 0% 30%,rgba(240,180,41,.1),transparent 50%),linear-gradient(180deg,#12151b 0%,var(--bg) 40%,#12151b 100%)}a{color:inherit;text-decoration:none}img{display:block;max-width:100%}.shell{width:min(var(--max),calc(100% - 40px));margin:0 auto}.topnav{display:flex;align-items:center;justify-content:space-between;padding:22px 0 8px}.topnav__brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:700;letter-spacing:.04em}.topnav__brand img{width:28px;height:28px;border-radius:7px}.topnav__links{display:flex;gap:18px;color:var(--muted);font-size:14px}.topnav__links a:hover{color:var(--fg)}.hero{min-height:calc(100vh - 88px);display:grid;align-content:center;gap:28px;padding:48px 0 72px;position:relative}.hero__mark{width:min(220px,42vw);height:auto;border-radius:28px;box-shadow:0 30px 80px #00000059;animation:rise .9s ease both}.hero__brand{margin:0;font-family:var(--font-display);font-size:clamp(64px,14vw,112px);font-weight:800;letter-spacing:.02em;line-height:.95;animation:rise .9s 80ms ease both}.hero__slogan{margin:0;max-width:16em;font-size:clamp(22px,3.6vw,34px);font-weight:600;line-height:1.35;animation:rise .9s .14s ease both}.hero__lead{margin:0;max-width:28em;color:var(--muted);font-size:clamp(16px,2vw,18px);animation:rise .9s .2s ease both}.cta-row{display:flex;flex-wrap:wrap;gap:12px;animation:rise .9s .26s ease both}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 22px;border-radius:999px;border:1px solid transparent;font-size:15px;font-weight:600;transition:transform .16s ease,background .16s ease,border-color .16s ease}.btn:hover{transform:translateY(-1px)}.btn--primary{background:var(--accent);color:#fff}.btn--primary:hover{background:#f04d35}.btn--ghost{border-color:var(--line);background:#ffffff08;color:var(--fg)}.btn--ghost:hover{border-color:#f5f6f847}.section{padding:72px 0;border-top:1px solid var(--line)}.section__title{margin:0 0 8px;font-size:clamp(24px,4vw,32px);font-weight:700}.section__desc{margin:0 0 32px;color:var(--muted);max-width:34em}.feature-list{list-style:none;margin:0;padding:0;display:grid;gap:0}.feature-list li{display:grid;grid-template-columns:120px 1fr;gap:20px;padding:22px 0;border-top:1px solid var(--line)}.feature-list li:last-child{border-bottom:1px solid var(--line)}.feature-list strong{color:var(--gold);font-size:15px;font-weight:700}.feature-list p{margin:0;color:var(--muted)}.privacy-band{display:grid;gap:16px;padding:36px 0}.privacy-band p{margin:0;color:var(--muted);max-width:36em}.site-footer{padding:40px 0 56px;border-top:1px solid var(--line);color:var(--muted);font-size:14px;display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between}.site-footer a:hover{color:var(--fg)}.doc-page{width:min(720px,calc(100% - 40px));margin:0 auto;padding:40px 0 80px}.doc-page .back{color:var(--muted);font-size:14px;margin-bottom:24px;display:inline-block}.doc-page .back:hover{color:var(--fg)}.doc-page h1{margin:0 0 12px;font-size:clamp(28px,5vw,36px)}.doc-page .meta{color:var(--muted);font-size:14px;margin:0 0 28px}.doc-page h2{margin:32px 0 12px;font-size:18px}.doc-page p,.doc-page ul{margin:0 0 12px;color:#f5f6f8e0}.doc-page ul{padding-left:1.2em}.doc-page a{color:var(--gold)}@keyframes rise{0%{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}@media (max-width: 640px){.feature-list li{grid-template-columns:1fr;gap:6px}.topnav__links{gap:14px}}