:root{--bg:#f2f8fb;--card:#fff;--ink:#1d2a36;--muted:#52667a;--line:#d5e3ec;--teal:#0e7c86;--teal-d:#0a5f67;--sun:#ffc94d;--side:#12303d}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.85 -apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif}
a{color:var(--teal)}
:focus-visible{outline:3px solid var(--sun);outline-offset:2px}
.layout{display:flex;min-height:100vh}
.side{width:230px;flex:none;background:var(--side);color:#cfe3ea;padding:28px 22px;position:sticky;top:0;height:100vh}
.brand{display:block;color:#fff;font-weight:800;font-size:20px;line-height:1.4;text-decoration:none;margin-bottom:28px}
.brand small{display:block;font-weight:400;font-size:13px;color:#8fb2bf;margin-top:6px}
.side nav a{display:block;color:#cfe3ea;text-decoration:none;padding:9px 12px;border-radius:8px;margin-bottom:4px}
.side nav a:hover{background:#1d4455}
.side nav a[aria-current=page]{background:var(--sun);color:#3a2a00;font-weight:700}
.main{flex:1;min-width:0}
.wrap{max-width:820px;padding:56px 40px 40px}
h1{font-size:34px;line-height:1.35;margin:0 0 20px;padding-left:16px;border-left:8px solid var(--sun)}
h2{font-size:22px;margin:40px 0 10px;color:var(--teal-d)}
p{margin:0 0 14px}
.lead{font-size:18px;color:var(--muted)}
.btns{display:flex;flex-wrap:wrap;gap:14px;margin:30px 0}
.btn{display:inline-block;padding:14px 28px;border-radius:10px;font-weight:700;font-size:17px;text-decoration:none;transition:transform .15s}
.btn:hover{transform:translateY(-2px)}
.btn-main{background:var(--teal);color:#fff}
.btn-main:hover{background:var(--teal-d)}
.btn-alt{background:var(--sun);color:#3a2a00}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;list-style:none;padding:0;margin:18px 0}
.card{display:block;height:100%;background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px;text-decoration:none;color:var(--ink)}
a.card:hover{border-color:var(--teal)}
.card h3{margin:0 0 6px;font-size:18px;color:var(--teal-d)}
.card p{margin:0;color:var(--muted);font-size:15px;line-height:1.7}
dt{font-weight:700;font-size:18px;color:var(--teal-d);margin-top:22px}
dd{margin:6px 0 0}
.note{font-size:14px;color:var(--muted)}
footer{border-top:1px solid var(--line);padding:26px 40px;font-size:14px;color:var(--muted);max-width:820px}
footer p{margin:0 0 8px}
@media(max-width:860px){
 .layout{display:block}
 .side{position:static;width:auto;height:auto;padding:16px 18px}
 .brand{margin-bottom:10px}
 .side nav{display:flex;flex-wrap:wrap;gap:6px}
 .side nav a{margin:0;padding:6px 12px}
 .wrap{padding:32px 18px 24px}
 footer{padding:22px 18px}
 h1{font-size:28px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important}html{scroll-behavior:auto}}