:root{color-scheme:dark;--bg:#060b1b;--panel:#10172d;--line:#25304a;--text:#f2f4ff;--muted:#a9b4cf;--accent:#b9a8ff}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.8 system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif}a{color:var(--accent);text-underline-offset:4px;overflow-wrap:anywhere}a:hover{color:#fff}a:focus-visible{outline:3px solid #cfbcff;outline-offset:5px}header,main,footer{width:min(1080px,calc(100% - 40px));margin:auto}header{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:24px 0;border-bottom:1px solid var(--line)}.brand{color:var(--text);font-weight:750;text-decoration:none}nav{display:flex;flex-wrap:wrap;gap:12px 24px;font-size:14px}nav a{text-decoration:none}main{padding:64px 0 80px}.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.2em;color:var(--accent);font-weight:700}h1{font-size:clamp(34px,6vw,64px);line-height:1.15;letter-spacing:-.04em;margin:18px 0}h2{font-size:25px;line-height:1.4;margin:36px 0 14px}h3{font-size:18px;margin:0 0 10px}p{margin:12px 0}.muted,.subtitle{color:var(--muted)}.subtitle{font-size:19px}.hero{display:grid;grid-template-columns:1.25fr 1fr;align-items:center;gap:64px;padding:10px 0 56px}.lead{font-size:19px;max-width:620px}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.button{display:inline-block;background:#7350e8;color:white;border:1px solid #9578f5;border-radius:12px;padding:10px 20px;text-decoration:none;font-weight:650}.button.secondary{background:transparent;border-color:var(--line)}.practice{background:linear-gradient(135deg,#191c3d,#10172d);border:1px solid #464269;border-radius:24px;padding:32px}.formula{font-size:clamp(35px,5vw,52px);font-weight:750;letter-spacing:-.03em;margin:20px 0}.answer{background:#1b3030;color:#b5edce;padding:14px 18px;border-radius:12px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.card{padding:24px;border:1px solid var(--line);border-radius:16px;background:var(--panel)}.card p{color:var(--muted)}.legal{max-width:820px}.legal h1{font-size:clamp(32px,5vw,46px)}.legal section{margin-top:32px}.legal li{margin:8px 0}.notice{border-left:3px solid #9578f5;padding:14px 20px;background:var(--panel);margin:24px 0}.language{padding:10px 0 22px;border-bottom:1px solid var(--line)}.translation{border-top:1px solid var(--line);padding-top:24px;margin-top:48px}details{padding:18px 0;border-bottom:1px solid var(--line)}summary{cursor:pointer;font-weight:650}footer{border-top:1px solid var(--line);padding:24px 0 36px;color:var(--muted);font-size:13px}footer .links{display:flex;gap:20px;flex-wrap:wrap;margin-bottom:10px}.mail{font-size:clamp(16px,3vw,24px)}@media(max-width:700px){header{align-items:flex-start;flex-direction:column;gap:12px}main{padding-top:40px}.hero{grid-template-columns:1fr;gap:28px}.grid{grid-template-columns:1fr}.practice{padding:24px}h1{overflow-wrap:anywhere}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media print{body{background:white;color:#111}a{color:#333}.notice,.card{background:white}header,footer{display:none}.legal{max-width:none}}

/* ComputeViewsHub shared palette, surfaces and responsive navigation. */
:root{--bg:#020617;--panel:rgba(15,23,42,.4);--line:#1e293b;--text:#f1f5f9;--muted:#94a3b8;--accent:#818cf8;--practice:#0f172a;--answer:#102b28;color-scheme:dark}
@media(prefers-color-scheme:light){:root:not([data-theme="dark"]){--bg:#f8fafc;--panel:#fff;--line:#e2e8f0;--text:#0f172a;--muted:#475569;--accent:#4f46e5;--practice:#eef2ff;--answer:#d1fae5;color-scheme:light}}
:root[data-theme="light"]{--bg:#f8fafc;--panel:#fff;--line:#e2e8f0;--text:#0f172a;--muted:#475569;--accent:#4f46e5;--practice:#eef2ff;--answer:#d1fae5;color-scheme:light}
body{font:14px/1.8 ui-sans-serif,system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif}
header,main,footer{width:min(1216px,calc(100% - 48px))}
header{min-height:64px;padding:12px 0;gap:20px}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:16px;letter-spacing:-.025em;white-space:nowrap}
.brand-icon{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:12px;background:linear-gradient(to top right,#4f46e5,#8b5cf6);color:#fff;font-size:28px;line-height:1}
nav{align-items:center;gap:4px;font-size:12px}
nav a{padding:6px 10px;border-radius:8px;color:var(--muted)}
nav a:hover,nav a[aria-current="page"]{background:var(--panel);color:var(--text)}
[data-theme-toggle]{border:1px solid var(--line);border-radius:10px;padding:4px 11px;background:var(--panel);color:var(--text);font-size:20px;cursor:pointer}
[hidden]{display:none!important}
main{padding:48px 0 64px}
h1{font-size:clamp(30px,4.5vw,48px);font-weight:750;letter-spacing:-.035em}
h2{font-size:22px;letter-spacing:-.025em}
h3{font-size:16px}
.eyebrow{letter-spacing:.12em}
.hero{gap:40px;padding:24px 0 40px}
.subtitle,.lead{font-size:17px}
.button{background:#4f46e5;border-color:#4f46e5;border-radius:12px;font-size:13px;padding:10px 18px;color:#fff}
.button:hover{background:#6366f1;color:#fff}
.button.secondary{background:var(--panel);color:var(--text);border-color:var(--line)}
.practice{background:var(--practice);border:1px solid var(--line);border-radius:24px}
.answer{background:var(--answer);color:var(--accent)}
.card{border-radius:16px;box-shadow:0 1px 2px #0000000d}
.notice{border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:12px;padding:16px 24px}
.legal{max-width:820px}.legal h1{font-size:clamp(30px,4.5vw,40px)}
.translation{scroll-margin-top:24px}
a:hover{color:var(--text)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
.skip-link{position:absolute;top:-100px;left:16px;padding:8px 16px;background:var(--bg);z-index:10}.skip-link:focus{top:8px}
@media(max-width:800px){header{flex-direction:column;align-items:flex-start;gap:12px}.hero{grid-template-columns:1fr;gap:24px}.grid{grid-template-columns:1fr}header,main,footer{width:calc(100% - 32px)}main{padding-top:32px}nav{gap:2px}nav a{padding:6px 8px}.practice{padding:24px}}
@media print{:root{--bg:white;--panel:white;--line:#ccc;--text:#111;--muted:#333;--accent:#333}body{background:white;color:#111}.skip-link{display:none}}

/* A native language menu remains usable with JavaScript disabled. */
.locale-picker{position:relative;padding:0;border:0;font-size:12px}
.locale-picker summary{list-style:none;white-space:nowrap;border:1px solid var(--line);border-radius:10px;padding:6px 10px;color:var(--muted)}
.locale-picker summary::-webkit-details-marker{display:none}
.locale-options{position:absolute;right:0;top:calc(100% + 8px);z-index:20;display:grid;grid-template-columns:repeat(2,minmax(90px,1fr));gap:4px;min-width:230px;padding:8px;border:1px solid var(--line);border-radius:12px;background:var(--bg);box-shadow:0 10px 24px #0003}
.locale-options a{display:block}
@media(max-width:800px){nav{width:100%;flex-wrap:wrap}.locale-options{right:auto;left:0}.legal h1{overflow-wrap:anywhere}.brand-icon{flex-shrink:0}}
@media print{.locale-picker{display:none}}
@media(max-width:800px){.locale-options{position:static;min-width:0;width:min(230px,calc(100vw - 32px));margin-top:8px}}