:root{--navy:#0d1733;--ink:#172136;--muted:#5d677b;--line:#e3e7ef;--bg:#f6f7fb;--card:#fff;--soft:#f0f3fa;
--brand:#2848d8;--brand-ink:#1e37b0;--accent:#0e9f6e;--accent-soft:#e7f7f0;--amber:#ffc53d;--warn-soft:#fff7e0;--warn:#9a6700;
--radius:16px;--shadow:0 1px 2px rgba(16,24,40,.05),0 4px 16px rgba(16,24,40,.06)}
@media (prefers-color-scheme:dark){:root{--ink:#e8ecf6;--muted:#a3adc2;--line:#27314a;--bg:#0b1122;--card:#121a30;--soft:#18213b;
--brand:#8fa6ff;--brand-ink:#b7c6ff;--accent:#34d399;--accent-soft:#11332a;--warn-soft:#2e2508;--warn:#ffd36b;--shadow:none}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;min-height:100vh;display:flex;flex-direction:column;font:17px/1.65 system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--brand);text-underline-offset:3px}a:hover{color:var(--brand-ink)}
.ic{width:20px;height:20px;flex:none}.wrap{max-width:1140px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-999px}.skip:focus{left:12px;top:12px;background:#fff;padding:8px;z-index:9}
/* header */
header.site{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.86);backdrop-filter:saturate(1.4) blur(10px);border-bottom:1px solid var(--line)}
@media (prefers-color-scheme:dark){header.site{background:rgba(11,17,34,.85)}}
header.site .wrap{display:flex;align-items:center;gap:22px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;font-size:21px;letter-spacing:-.02em;white-space:nowrap}
.brand .logo{width:34px;height:34px}.brand b{color:var(--accent);font-weight:800}
nav.main{display:flex;gap:4px;overflow-x:auto;scrollbar-width:none;margin-left:auto}
@media (max-width:760px){nav.main{-webkit-mask-image:linear-gradient(90deg,#000 85%,transparent);mask-image:linear-gradient(90deg,#000 85%,transparent)}}
main{padding-bottom:56px}.hero.fill{flex:1}nav.main::-webkit-scrollbar{display:none}
nav.main a{white-space:nowrap;text-decoration:none;color:var(--muted);font-size:15px;font-weight:600;padding:8px 12px;border-radius:999px}
nav.main a:hover{background:var(--soft);color:var(--ink)}
.age{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;flex:none;border-radius:50%;border:2px solid currentColor;font-weight:800;font-size:12px;letter-spacing:-.04em}
header .age{color:var(--muted);margin-left:4px}
@media (max-width:760px){header.site .wrap{flex-wrap:wrap;gap:0;padding-top:8px}nav.main{order:3;width:100%;margin:4px -8px 6px}header .age{margin-left:auto}}
/* hero */
.hero{position:relative;overflow:hidden;color:#fff;background:radial-gradient(900px 400px at 85% -10%,rgba(14,159,110,.45),transparent 60%),
radial-gradient(700px 380px at 0% 120%,rgba(40,72,216,.55),transparent 60%),linear-gradient(135deg,#0d1733,#16275c 55%,#123f63)}
.hero .wrap{padding-top:28px;padding-bottom:36px}.hero a{color:#cfe0ff}
.crumbs{font-size:14px;color:#b9c6e4;display:flex;flex-wrap:wrap;gap:6px}
@media (max-width:760px){.crumbs>span:last-child,.crumbs>span[aria-hidden]:nth-last-child(2){display:none}}.crumbs a{color:#dbe5ff;text-decoration:none}.crumbs a:hover{text-decoration:underline}
.pill{display:inline-flex;align-items:center;gap:6px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2);color:#fff;
border-radius:999px;padding:4px 12px;font-size:13px;font-weight:700;letter-spacing:.02em;text-decoration:none;margin-top:16px}
.pill .ic{width:16px;height:16px}
.hero h1{font-size:clamp(28px,4.4vw,44px);line-height:1.12;letter-spacing:-.025em;margin:14px 0 12px;max-width:880px}
.hero .lead{font-size:clamp(17px,2vw,20px);color:#d8e1f5;max-width:760px;margin:0}
.facts{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:20px;font-size:14px;color:#c9d5f0}.facts span{display:inline-flex;align-items:center;gap:6px}
.facts .ic{width:17px;height:17px;color:#7ee2b8}
/* layout */
.layout{display:grid;grid-template-columns:minmax(0,1fr);gap:36px;padding:32px 0 20px}
@media (min-width:1000px){.layout.has-toc{grid-template-columns:minmax(0,1fr) 260px}}
article.content{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:clamp(20px,4vw,44px);min-width:0}
article.content>:first-child{margin-top:0}article p,article li,article td{overflow-wrap:anywhere}.table{max-width:100%}
article h2{font-size:26px;line-height:1.25;letter-spacing:-.015em;margin:1.8em 0 .55em;padding-top:.2em}
article h3{font-size:20px;margin:1.5em 0 .4em}article p,article li{max-width:72ch}article li{margin:.35em 0}
article ol{padding-left:1.3em}article ol li::marker{font-weight:800;color:var(--accent)}article ul li::marker{color:var(--accent)}
article strong{color:var(--ink)}
.disclosure{display:flex;gap:10px;align-items:flex-start;font-size:14px;color:var(--muted);background:var(--soft);border-radius:12px;padding:10px 14px;margin:0 0 22px}
.disclosure .ic{width:18px;height:18px;margin-top:2px}
.table{overflow-x:auto;margin:18px 0;border:1px solid var(--line);border-radius:12px}
table{border-collapse:collapse;width:100%;font-size:15px}th,td{padding:11px 14px;text-align:left;vertical-align:top;border-bottom:1px solid var(--line)}
th{background:var(--soft);font-size:13px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}tr:last-child td{border-bottom:0}
tbody tr:nth-child(even) td{background:color-mix(in srgb,var(--soft) 45%,transparent)}
aside.note{border-left:4px solid var(--amber);background:var(--warn-soft);border-radius:0 12px 12px 0;padding:12px 16px;margin:18px 0}
.cta{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;padding:12px 18px;border-radius:12px;text-decoration:none;font-weight:700}
.cta:hover{color:#fff;filter:brightness(1.05)}.cta.disabled{background:#94a3b8}
/* tools */
form.tool{position:relative;background:linear-gradient(180deg,var(--soft),var(--card));border:1px solid var(--line);border-radius:var(--radius);padding:52px 20px 20px;margin:24px 0;box-shadow:var(--shadow)}
form.tool::before{content:attr(data-label);position:absolute;top:16px;left:20px;font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.06em;color:var(--accent)}
form.tool .row{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:6px}form.tool label{flex:1 1 180px;font-size:14px;font-weight:650;display:flex;flex-direction:column;gap:6px;color:var(--muted)}
form.tool .row.sel{gap:10px;align-items:flex-end}form.tool .row.sel label{flex:1 1 120px}form.tool label{min-width:0}
form.tool input,form.tool select{width:100%;max-width:100%;min-width:0;font:inherit;color:var(--ink);background:var(--card);padding:10px 12px;border:1.5px solid var(--line);border-radius:10px;min-height:46px}
form.tool input:focus,form.tool select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px color-mix(in srgb,var(--brand) 18%,transparent)}
form.tool output{display:block;margin-top:16px;background:var(--navy);color:#e7ecfa;border-radius:12px;padding:16px 18px;font-size:16px;line-height:1.7}
form.tool output strong{color:#fff;font-size:1.12em}form.tool output .muted{color:#a9b6d6}
@media (prefers-color-scheme:dark){form.tool output{background:#0a1022;border:1px solid var(--line)}}
/* toc */
aside.toc{display:none}
@media (min-width:1000px){aside.toc{display:block;position:sticky;top:88px;align-self:start;font-size:14px}
aside.toc .box{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;box-shadow:var(--shadow)}
aside.toc h2{font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 8px}
aside.toc ol{list-style:none;margin:0;padding:0}aside.toc li{margin:0;border-left:2px solid var(--line)}
aside.toc a{display:block;padding:6px 0 6px 12px;color:var(--muted);text-decoration:none;line-height:1.35}aside.toc a:hover{color:var(--brand);border-color:var(--brand)}
aside.toc .help{margin-top:14px;background:var(--accent-soft);border-color:transparent}aside.toc .help p{margin:.3em 0}}
/* sources */
details.sources{margin-top:36px;border:1px solid var(--line);border-radius:12px;background:var(--soft)}
details.sources summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:10px;padding:14px 16px;font-weight:700}
details.sources summary::-webkit-details-marker{display:none}details.sources summary small{font-weight:500;color:var(--muted)}
details.sources summary::after{content:"+";margin-left:auto;font-size:20px;color:var(--muted)}details.sources[open] summary::after{content:"–"}
details.sources ul{margin:0;padding:0 18px 14px 36px;font-size:14px}details.sources li{margin:.4em 0}details.sources .d{color:var(--muted)}
/* cards */
.section-head{display:flex;align-items:center;gap:12px;margin:44px 0 16px}.section-head h2{margin:0;font-size:24px;letter-spacing:-.015em}
.section-head .chip{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--accent-soft);color:var(--accent)}
.section-head .chip .ic{width:22px;height:22px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
a.card{display:flex;flex-direction:column;gap:8px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;
text-decoration:none;color:var(--ink);box-shadow:var(--shadow);transition:transform .15s ease,border-color .15s ease,box-shadow .15s ease}
a.card:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--brand) 45%,var(--line));box-shadow:0 10px 28px rgba(16,24,40,.10)}
a.card .top{display:flex;align-items:center;gap:8px;color:var(--accent);font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.06em}
a.card .top .ic{width:17px;height:17px}a.card h3{margin:0;font-size:18px;line-height:1.3;letter-spacing:-.01em}
a.card p{margin:0;color:var(--muted);font-size:15px;line-height:1.5;flex:1}
a.card .go{display:flex;align-items:center;gap:6px;color:var(--brand);font-weight:700;font-size:14px;margin-top:6px}a.card .go .ic{width:16px;height:16px;transition:transform .15s}
a.card:hover .go .ic{transform:translateX(3px)}a.card.tool{background:linear-gradient(160deg,var(--card) 60%,var(--accent-soft))}
.trust{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}.trust span{display:inline-flex;align-items:center;gap:6px;font-size:14px;font-weight:600;
background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.18);padding:7px 12px;border-radius:999px;color:#e9f0ff}.trust .ic{width:16px;height:16px;color:#7ee2b8}
.quick{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}.quick a{display:inline-flex;align-items:center;gap:8px;background:#fff;color:#0d1733;text-decoration:none;
font-weight:700;padding:11px 16px;border-radius:12px;font-size:15px}.quick a:hover{background:#e9f0ff;color:#0d1733}.quick .ic{color:#0e9f6e}
.about{margin:48px 0 8px}.about article.content h2:first-child{margin-top:0}
.related{margin-top:8px}
/* home + locales */
.locales{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin:28px 0}
.locales a{display:flex;align-items:center;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;
text-decoration:none;color:var(--ink);font-weight:700;font-size:18px;box-shadow:var(--shadow)}.locales a small{display:block;color:var(--muted);font-weight:500;font-size:14px}
.locales .flag{font-size:30px}
/* footer */
footer.site{margin-top:auto;background:var(--navy);color:#c3cde4;font-size:14px}footer.site a{color:#e3eaff}
footer.site .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:28px;padding:40px 0 24px}
footer.site h2{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:#fff;margin:0 0 10px}footer.site ul{list-style:none;padding:0;margin:0}footer.site li{margin:6px 0}
footer.site .brand{color:#fff;font-size:19px}footer.site .rg{display:flex;gap:14px;align-items:flex-start;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.1);border-radius:14px;padding:16px 18px}
footer.site .rg .age{color:#ffc53d;border-color:#ffc53d}footer.site .legal{border-top:1px solid rgba(255,255,255,.1);padding:18px 0 28px;color:#95a3c4;font-size:13px}
.preview-bar{background:#b91c1c;color:#fff;text-align:center;font-weight:700;padding:6px;position:sticky;top:0;z-index:30}
.notfound{text-align:center;padding:40px 0}.notfound .big{font-size:72px;font-weight:800;letter-spacing:-.04em;color:#fff;opacity:.9}
@media print{header.site,footer.site,aside.toc,.hero .facts{display:none}.hero{background:none;color:#000}}