:root{--bg:#fff;--text:#222;--muted:#555;--primary:#1e3a8a;--primary-600:#15306d}
*{box-sizing:border-box}html,body{margin:0;padding:0}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
.container{width:min(1100px,92%);margin:0 auto}
.header{position:sticky;top:0;background:#ffffffd9;border-bottom:1px solid #e5e5e5;backdrop-filter:blur(6px);z-index:10}
.header__inner{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.brand img{display:block}
.hero{padding:64px 0 40px;border-bottom:1px solid #e5e5e5}
.hero h1{color:var(--primary);margin:0 0 8px}.hero p{color:var(--muted);margin:0 0 14px}
.footer{border-top:1px solid #e5e5e5;padding:18px 0;margin-top:24px}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 14px;border-radius:8px;border:1px solid transparent;cursor:pointer}
.btn--primary{background:linear-gradient(180deg,var(--primary),var(--primary-600));color:#fff;font-weight:600}
.log{background:#f7f7f9;border:1px solid #eee;border-radius:8px;padding:8px;white-space:pre-wrap;color:#333}
.tips{margin:10px 0}