:root{--bg:#f6f6fb;--card:#ffffff;--soft:#f0f0f6;--text:#2d2f33;--muted:#5d6068;--primary:#137fec;--primary-dark:#0b5fba;--tint:#d4e8fb}
@media (prefers-color-scheme:dark){:root{--bg:#121318;--card:#1c1d23;--soft:#24252c;--text:#ecedf2;--muted:#a3a6ae;--primary:#4ea0f2;--primary-dark:#8cc2f7;--tint:#1a2f47}}
*{box-sizing:border-box;margin:0}
body{background:var(--bg);color:var(--text);font:400 17px/1.6 "Be Vietnam Pro",system-ui,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--primary)}
.wrap{max-width:760px;margin:0 auto;padding:0 20px}
header{padding:28px 0}
header .wrap{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.brand{font:800 15px/1 "Plus Jakarta Sans",sans-serif;letter-spacing:.08em;color:var(--text);text-decoration:none}
nav a{color:var(--muted);text-decoration:none;font-size:15px;margin-left:20px}
nav a:hover{color:var(--text)}
h1,h2,h3{font-family:"Plus Jakarta Sans",sans-serif;line-height:1.15;letter-spacing:-.02em}
.hero{padding:72px 0 56px}
.hero h1{font-size:clamp(2.4rem,7vw,3.6rem);font-weight:800;max-width:14ch}
.hero p{font-size:1.2rem;color:var(--muted);max-width:36ch;margin-top:20px}
.card{background:var(--card);border-radius:24px;padding:32px;margin-bottom:24px}
.app{display:flex;gap:24px;align-items:flex-start;flex-wrap:wrap}
.icon{width:72px;height:72px;border-radius:18px;flex:none;background:#fff;box-shadow:0 2px 10px rgba(45,47,51,.12)}
.app h2{font-size:1.6rem}
.app p{color:var(--muted);margin:8px 0 18px}
.btn{display:inline-block;background:var(--primary);color:#fff;text-decoration:none;font-weight:600;padding:12px 22px;border-radius:999px}
.btn:hover{background:var(--primary-dark)}
.doc{padding:40px 0 24px}
.doc h1{font-size:clamp(2rem,6vw,2.8rem);font-weight:800}
.doc .meta{color:var(--muted);margin:10px 0 32px;font-size:15px}
.doc h2{font-size:1.3rem;margin:36px 0 10px}
.doc h3{font-size:1.05rem;margin:22px 0 6px}
.doc p,.doc li{color:var(--text)}
.doc ul{padding-left:22px;margin:8px 0}
.doc li{margin:4px 0}
.table{overflow-x:auto;margin:14px 0}
table{border-collapse:collapse;width:100%;font-size:15px;background:var(--card);border-radius:16px;overflow:hidden}
th,td{text-align:left;padding:12px 14px;vertical-align:top}
th{background:var(--soft);font-weight:600}
tr+tr td{border-top:1px solid var(--soft)}
footer{padding:48px 0;color:var(--muted);font-size:14px}
footer .wrap{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
footer a{color:var(--muted)}