:root{--navy:#0b1220;--navy2:#111c31;--ink:#0f172a;--mut:#5b6b80;--line:#e3e9f1;--bg:#f6f8fb;--c1:#22d3ee;--c2:#2563eb;--grad:linear-gradient(135deg,#22d3ee 0%,#2563eb 100%);--r:14px}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;font:17px/1.65 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:#1d5fd6;text-underline-offset:3px}a:hover{color:#0b3d9e}img{max-width:100%;height:auto}
.w{max-width:1120px;margin:auto;padding:0 20px}.narrow{max-width:780px}
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);backdrop-filter:saturate(1.6) blur(10px);-webkit-backdrop-filter:saturate(1.6) blur(10px);border-bottom:1px solid var(--line)}
header.site .w{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}.logo img{height:36px;width:auto;display:block}
nav.main{display:flex;gap:4px}nav.main a{color:var(--ink);text-decoration:none;font-weight:600;font-size:15px;padding:8px 12px;border-radius:999px}nav.main a:hover{background:#eef4ff;color:var(--c2)}
.menu{display:none}
@media(max-width:760px){nav.main{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;flex-direction:column;padding:10px 20px 16px;border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(15,23,42,.08)}#m:checked~nav.main{display:flex}.menu{display:block;cursor:pointer;padding:8px;border-radius:8px;border:1px solid var(--line);font-weight:700}}
.hero{background:radial-gradient(1200px 500px at 85% -10%,rgba(34,211,238,.35),transparent 60%),radial-gradient(900px 500px at 0% 120%,rgba(37,99,235,.35),transparent 60%),var(--navy);color:#e6eef8;padding:72px 0 80px;position:relative;overflow:hidden}
.hero h1{font-size:clamp(34px,5.2vw,58px);line-height:1.08;letter-spacing:-.02em;margin:0 0 16px;color:#fff;max-width:820px}.hero p.lead{font-size:clamp(17px,2vw,21px);color:#b8c7da;max-width:680px;margin:0 0 28px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.btn{display:inline-block;padding:12px 20px;border-radius:999px;font-weight:700;text-decoration:none;margin:0 10px 10px 0}.btn.p{background:var(--grad);color:#fff;box-shadow:0 8px 24px rgba(37,99,235,.35)}.btn.s{border:1px solid rgba(255,255,255,.25);color:#e6eef8}.btn:hover{transform:translateY(-1px);color:#fff}
.stats{display:flex;gap:28px;flex-wrap:wrap;margin-top:26px;color:#9fb3cb;font-size:14px}.stats b{display:block;color:#fff;font-size:22px}
.phead{background:radial-gradient(800px 300px at 90% 0,rgba(34,211,238,.25),transparent 60%),var(--navy);color:#cbd8e8;padding:34px 0 38px}.phead h1{color:#fff;font-size:clamp(28px,4vw,42px);line-height:1.15;margin:6px 0 8px;letter-spacing:-.015em}.phead .bc,.phead .bc a{color:#8fb3d9;font-size:13px;text-decoration:none}.phead .meta{font-size:13px;color:#8aa0ba}
main{padding:36px 0 64px}article{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:clamp(20px,4vw,40px);box-shadow:0 1px 2px rgba(15,23,42,.04)}
article h1{display:none}h2{font-size:clamp(22px,2.6vw,27px);letter-spacing:-.01em;margin:34px 0 10px;line-height:1.25}h3{font-size:19px;margin:22px 0 6px}article>h2:first-child{margin-top:0}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:28px;align-items:start}@media(max-width:960px){.layout{grid-template-columns:1fr}}
aside.side{position:sticky;top:84px;display:grid;gap:16px}.box{background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:18px}.box h4{margin:0 0 8px;font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--mut)}.box ul{margin:0;padding-left:18px;font-size:15px}
.section{padding:56px 0}.section h2.t{font-size:clamp(26px,3.2vw,34px);margin:0 0 6px;text-align:left}.section p.sub{color:var(--mut);margin:0 0 26px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:18px}
.card{position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px;transition:transform .15s,box-shadow .15s,border-color .15s}.card:hover{transform:translateY(-2px);box-shadow:0 14px 30px rgba(15,23,42,.08);border-color:#cfe0f7}
.card h3{margin:12px 0 6px;font-size:18px}.card h3 a{color:var(--ink);text-decoration:none}.card h3 a::after{content:"";position:absolute;inset:0}.card p{margin:0;color:var(--mut);font-size:15px}
.ic{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(34,211,238,.16),rgba(37,99,235,.16));color:var(--c2)}.ic svg{width:24px;height:24px}
.tag{display:inline-block;font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--c2);background:#eaf2ff;border-radius:999px;padding:3px 10px}
.dark{background:var(--navy);color:#cbd8e8}.dark h2.t{color:#fff}.dark .card{background:var(--navy2);border-color:#1f2c44}.dark .card h3 a{color:#fff}.dark .card p{color:#9fb3cb}
.tw{overflow-x:auto;margin:16px 0;border:1px solid var(--line);border-radius:12px}table{border-collapse:collapse;width:100%;font-size:15px;background:#fff}th,td{padding:11px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}th{background:#f1f5fb;font-size:13px;text-transform:uppercase;letter-spacing:.04em;color:#334155}tr:last-child td{border-bottom:0}tbody tr:hover,tr:hover td{background:#fafcff}
.note{background:#fff8e6;border:1px solid #f6dd9b;border-left:4px solid #f0b429;border-radius:10px;padding:12px 16px;margin:18px 0;font-size:15px}.note.safe{background:#fff1f1;border-color:#f8caca;border-left-color:#e5484d}.note.info{background:#eef6ff;border-color:#cfe2ff;border-left-color:var(--c2)}
.src{font-size:14px;color:var(--mut)}ol.src{padding-left:22px}
.aff{border:1.5px dashed #9fb6d4;background:linear-gradient(180deg,#f8fbff,#fff);padding:16px 18px;border-radius:12px;margin:22px 0}.aff h2{margin-top:0;font-size:20px}
label{display:block;margin:14px 0 6px;font-weight:600;font-size:15px}select,input{width:100%;max-width:420px;padding:11px 12px;font-size:16px;border:1px solid #cfd9e6;border-radius:10px;background:#fff;color:var(--ink)}select:focus,input:focus{outline:2px solid rgba(37,99,235,.35);border-color:var(--c2)}
.tool{background:linear-gradient(180deg,#f7fbff,#fff);border:1px solid #d9e6f7;border-radius:var(--r);padding:20px 22px;margin:18px 0}.out{background:var(--navy);color:#e6eef8;border-radius:12px;padding:16px 18px;margin-top:16px;font-size:17px}.out b{color:#7dd3fc}
.faq h3{font-size:17px;margin:18px 0 4px}
footer.site{background:var(--navy);color:#9fb3cb;padding:48px 0 30px;font-size:15px}footer.site a{color:#cfe0f5;text-decoration:none}footer.site a:hover{color:#fff}.fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px}@media(max-width:760px){.fgrid{grid-template-columns:1fr 1fr}}
footer.site h4{color:#fff;font-size:13px;text-transform:uppercase;letter-spacing:.08em;margin:0 0 10px}footer.site ul{list-style:none;margin:0;padding:0}footer.site li{margin:6px 0}.fine{border-top:1px solid #1f2c44;margin-top:30px;padding-top:18px;font-size:13px;color:#7f93ab}
.logo img{height:46px}@media(max-width:760px){.logo img{height:38px}}header.site .w{height:74px}@media(max-width:760px){nav.main{top:74px}}aside.side{top:94px}
.qa{background:linear-gradient(135deg,rgba(34,211,238,.10),rgba(37,99,235,.10));border:1px solid #cfe2ff;border-radius:14px;padding:18px 20px;margin:0 0 20px}.qa h2{margin:0 0 6px;font-size:14px;text-transform:uppercase;letter-spacing:.08em;color:#1d5fd6}.qa p{margin:0;font-size:18px}
.kt{background:#0b1220;color:#dbe7f5;border-radius:14px;padding:18px 22px;margin:20px 0}.kt h2{color:#fff;margin:0 0 8px;font-size:18px}.kt ul{margin:0;padding-left:20px}.kt li{margin:4px 0}
.toc{border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:20px 0;background:#fbfdff}.toc h2{font-size:14px;text-transform:uppercase;letter-spacing:.08em;margin:0 0 6px;color:var(--mut)}.toc ol{margin:0;padding-left:20px;columns:2;column-gap:28px;font-size:15px}@media(max-width:640px){.toc ol{columns:1}}
.cta{display:flex;gap:16px;align-items:center;justify-content:space-between;flex-wrap:wrap;background:var(--grad);color:#fff;border-radius:14px;padding:20px 22px;margin:28px 0}.cta p{margin:0;font-weight:600;font-size:18px}.cta a{background:#fff;color:#0b3d9e;padding:10px 18px;border-radius:999px;font-weight:700;text-decoration:none}
.check{list-style:none;padding-left:0}.check li{padding-left:30px;position:relative;margin:8px 0}.check li::before{content:"✓";position:absolute;left:0;top:0;width:22px;height:22px;border-radius:50%;background:#e6f6ff;color:#0b6bcb;font-weight:700;display:grid;place-items:center;font-size:13px}
.mist li{margin:8px 0}.mist li b{color:#b42318}
.mech{background:#fff1f1;border:1px solid #f8caca;border-radius:12px;padding:16px 18px;margin:20px 0}.mech h3{margin:0 0 6px;color:#b42318}
figure.dg{margin:22px 0;background:#f7fbff;border:1px solid #d9e6f7;border-radius:14px;padding:14px}figure.dg svg{width:100%;height:auto;display:block}figure.dg figcaption{font-size:14px;color:var(--mut);margin-top:8px;text-align:center}
.rel{margin-top:30px}.rel .cards{grid-template-columns:repeat(auto-fill,minmax(210px,1fr))}.rel .card{padding:16px}.rel .card h3{font-size:16px;margin:8px 0 0}
.supnote{background:#f1f5fb;border:1px solid var(--line);border-radius:10px;padding:10px 14px;font-size:14px;color:#334155}
article p,article li{max-width:72ch}