:root{--bg:#f5f7fb;--surface:#fff;--surface-2:#eef3f8;--text:#172033;--muted:#667085;--line:#dce4ed;--brand:#2457d6;--brand-2:#18a999;--accent:#eaf0ff;--shadow:0 18px 50px rgba(28,45,78,.12);--header:72px;--sidebar:292px;color-scheme:light}
:root[data-theme=dark]{--bg:#0d1422;--surface:#131d2e;--surface-2:#1b273a;--text:#edf3ff;--muted:#a5b1c4;--line:#2b3950;--brand:#7da2ff;--brand-2:#4fd5c5;--accent:#1b2b50;--shadow:0 18px 50px rgba(0,0,0,.34);color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.68 Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;z-index:1000;left:1rem;top:-4rem;background:var(--text);color:var(--surface);padding:.7rem 1rem;border-radius:.6rem}.skip-link:focus{top:1rem}.topbar{position:fixed;z-index:50;inset:0 0 auto;height:var(--header);display:flex;align-items:center;gap:18px;padding:0 28px;background:color-mix(in srgb,var(--surface) 88%,transparent);border-bottom:1px solid var(--line);backdrop-filter:blur(16px)}.brand{display:flex;align-items:center;gap:12px;color:var(--text);text-decoration:none}.brand-mark{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;color:#fff;font-weight:800;letter-spacing:-1px;background:linear-gradient(135deg,#2457d6,#18a999);box-shadow:0 8px 24px rgba(36,87,214,.25)}.brand strong,.brand small{display:block;line-height:1.2}.brand small{color:var(--muted);margin-top:3px}.top-actions{margin-left:auto;display:flex;align-items:center;gap:10px}.icon-button,select{border:1px solid var(--line);background:var(--surface);color:var(--text);border-radius:10px;min-height:40px}.icon-button{width:40px;cursor:pointer;font-size:19px}.icon-button:hover,select:hover{border-color:var(--brand)}select{padding:0 34px 0 12px;font:inherit}.menu-button{display:none}.reading-progress{position:fixed;z-index:60;top:var(--header);left:0;width:0;height:3px;background:linear-gradient(90deg,var(--brand),var(--brand-2));transition:width .1s linear}.layout{display:grid;grid-template-columns:var(--sidebar) minmax(0,850px) 210px;justify-content:center;gap:0;padding-top:var(--header);min-height:100vh}.sidebar{position:sticky;top:var(--header);height:calc(100vh - var(--header));padding:24px 20px 18px;border-right:1px solid var(--line);overflow:auto;background:var(--surface)}.search-wrap{display:flex;align-items:center;gap:8px;padding:0 11px;border:1px solid var(--line);border-radius:12px;background:var(--bg);margin-bottom:22px}.search-wrap:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px color-mix(in srgb,var(--brand) 15%,transparent)}.search-wrap input{width:100%;height:42px;border:0;outline:0;color:var(--text);background:transparent;font:inherit}.search-wrap kbd{font:12px ui-monospace;padding:1px 6px;border:1px solid var(--line);border-radius:5px;color:var(--muted)}.nav-group{margin:0 0 20px}.nav-group-title{margin:0 10px 7px;color:var(--muted);font-size:11px;font-weight:800;letter-spacing:.09em;text-transform:uppercase}.nav-link{display:flex;align-items:center;gap:9px;width:100%;padding:8px 10px;margin:2px 0;border:0;border-radius:9px;background:transparent;color:var(--muted);font:inherit;text-align:left;cursor:pointer}.nav-link:hover{background:var(--surface-2);color:var(--text)}.nav-link.active{background:var(--accent);color:var(--brand);font-weight:700}.nav-link .nav-icon{width:22px;text-align:center}.no-results{padding:20px 10px;color:var(--muted)}.sidebar-footer{display:flex;gap:8px;align-items:center;margin:24px 10px 0;padding-top:18px;border-top:1px solid var(--line);color:var(--muted);font-size:12px}.status-dot{width:7px;height:7px;border-radius:50%;background:#22b573;box-shadow:0 0 0 4px rgba(34,181,115,.12)}.article{padding:54px 64px 90px;min-width:0;background:var(--surface);outline:0}.article-header{padding-bottom:28px;border-bottom:1px solid var(--line);margin-bottom:34px}.eyebrow{color:var(--brand);font-weight:800;letter-spacing:.07em;text-transform:uppercase;font-size:12px}.article h1{font-size:clamp(32px,5vw,48px);line-height:1.08;letter-spacing:-.035em;margin:10px 0 15px}.lede{font-size:18px;line-height:1.65;color:var(--muted);max-width:700px;margin:0}.meta{display:flex;gap:14px;align-items:center;margin-top:20px;color:var(--muted);font-size:13px}.meta span{display:flex;align-items:center;gap:5px}.article h2{font-size:24px;line-height:1.25;letter-spacing:-.02em;margin:42px 0 13px}.article h3{font-size:18px;margin:28px 0 8px}.article p{margin:0 0 16px}.article ul,.article ol{padding-left:24px}.article li{margin:7px 0}.article a{color:var(--brand)}.callout{display:grid;grid-template-columns:30px 1fr;gap:10px;padding:18px 20px;margin:25px 0;border:1px solid color-mix(in srgb,var(--brand) 30%,var(--line));border-radius:14px;background:var(--accent)}.callout strong{display:block;margin-bottom:3px}.step{display:grid;grid-template-columns:38px 1fr;gap:15px;margin:22px 0}.step-number{display:grid;place-items:center;width:34px;height:34px;border-radius:50%;background:var(--brand);color:#fff;font-weight:800}.step h3{margin:3px 0 5px}.shot{margin:28px 0 34px}.shot button{display:block;width:100%;padding:0;border:1px solid var(--line);border-radius:15px;overflow:hidden;background:var(--surface-2);cursor:zoom-in;box-shadow:var(--shadow)}.shot img{display:block;width:100%;max-height:620px;object-fit:contain;background:#fff}.shot figcaption{margin-top:10px;color:var(--muted);font-size:13px}.topic-pagination{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding-top:34px;margin-top:48px;border-top:1px solid var(--line)}.page-link{display:flex;flex-direction:column;padding:16px 18px;border:1px solid var(--line);border-radius:13px;color:var(--text);text-decoration:none}.page-link.next{text-align:right}.page-link:hover{border-color:var(--brand);transform:translateY(-1px)}.page-link small{color:var(--muted)}.on-this-page{position:sticky;top:var(--header);height:calc(100vh - var(--header));padding:48px 24px;border-left:1px solid var(--line);color:var(--muted);font-size:13px}.on-this-page strong{display:block;color:var(--text);font-size:12px;text-transform:uppercase;letter-spacing:.06em;margin-bottom:12px}.toc-link{display:block;padding:5px 0;color:var(--muted);text-decoration:none}.toc-link:hover{color:var(--brand)}.backdrop{display:none}dialog{max-width:min(1100px,94vw);max-height:92vh;padding:16px;border:0;border-radius:16px;background:var(--surface);color:var(--text);box-shadow:0 30px 100px rgba(0,0,0,.4)}dialog::backdrop{background:rgba(5,10,20,.75);backdrop-filter:blur(5px)}dialog img{display:block;max-width:100%;max-height:78vh;margin:auto}dialog p{margin:10px 36px 0 2px;color:var(--muted)}.dialog-close{position:absolute;right:12px;top:10px;width:36px;height:36px;border:0;border-radius:50%;background:var(--text);color:var(--surface);font-size:24px;cursor:pointer}
@media(max-width:1180px){.layout{grid-template-columns:var(--sidebar) minmax(0,850px)}.on-this-page{display:none}}
@media(max-width:760px){:root{--header:64px}.topbar{padding:0 14px}.brand strong{font-size:14px}.brand small{font-size:11px}.brand-mark{width:36px;height:36px}.language select{max-width:112px}.menu-button{display:block}.layout{display:block}.sidebar{position:fixed;z-index:45;top:var(--header);left:0;width:min(88vw,330px);transform:translateX(-105%);transition:transform .25s ease;box-shadow:var(--shadow)}body.menu-open .sidebar{transform:none}.backdrop{position:fixed;z-index:40;inset:var(--header) 0 0;background:rgba(7,12,24,.5)}body.menu-open .backdrop{display:block}.article{padding:38px 22px 70px}.article h1{font-size:34px}.topic-pagination{grid-template-columns:1fr}.shot{margin-left:-10px;margin-right:-10px}.top-actions{gap:6px}.icon-button{width:38px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}