:root{--bg:var(--ritel-bg);--panel:var(--ritel-surface);--fg:var(--ritel-fg);--muted:var(--ritel-muted);--line:var(--ritel-border);--focus:var(--ritel-focus);--pad:40px;--w:1440px}
*{box-sizing:border-box;scrollbar-color:var(--ritel-scrollbar) transparent}[hidden]{display:none!important}html{scroll-behavior:smooth;scroll-padding-top:112px;-webkit-text-size-adjust:100%}body{margin:0;font:17px/1.8 var(--ritel-body);font-synthesis:none}::selection{background:var(--ritel-selected);color:var(--fg)}body:lang(zh-Hant-HK){line-height:1.95}.ritel-theme h1{margin:0}.ritel-theme h2{margin:0 0 24px}.ritel-theme h3{margin:0 0 16px}p{margin:0 0 24px}a{color:var(--fg);text-decoration-color:var(--line);text-underline-offset:5px;overflow-wrap:anywhere}a:hover{text-decoration-color:var(--focus)}b,strong{font-weight:600;color:var(--fg)}button,input,select{font:inherit;color:inherit}button,a{touch-action:manipulation}:focus-visible{outline:2px solid var(--focus);outline-offset:5px}img{max-width:100%;height:auto}.wrap{max-width:var(--w);margin:auto;padding:0 var(--pad)}
.sr-only,.skip-link:not(:focus){position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip-path:inset(50%);white-space:nowrap}.skip-link:focus{position:fixed;top:16px;left:16px;z-index:100;background:var(--bg);padding:16px}.topbar{position:sticky;top:0;z-index:20;background:var(--bg);border-bottom:1px solid var(--line)}.topbar-inner{max-width:var(--w);margin:auto;padding:0 var(--pad);min-height:84px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:14px;text-decoration:none;white-space:nowrap}.brand img{width:44px;height:35px;object-fit:contain}:root:not(.dark) .brand img{filter:invert(1)}.brand span{font:25px/1 var(--ritel-heading)}.topbar nav{display:flex;align-items:center;justify-content:flex-end;gap:24px;font-size:15px}.topbar nav a{text-decoration:none}.topbar .language-switch{display:inline-flex;align-items:center;min-height:var(--ritel-field-height);color:var(--muted);white-space:nowrap} .theme-select{min-height:var(--ritel-field-height);max-width:132px;border:0;border-bottom:1px solid var(--line);padding:8px 18px 8px 0;background:var(--bg);color:var(--muted)}
.guide-layout{display:grid;grid-template-columns:180px minmax(0,840px);column-gap:clamp(48px,6vw,96px);justify-content:space-between}.guide-heading{grid-column:1/-1;padding:96px 0 60px;max-width:1040px}.guide-heading h1 span{color:var(--muted)}.lede{color:var(--muted);font-size:21px;max-width:66ch;margin:28px 0 0;line-height:1.6}.route-picker{grid-column:1/-1;margin:0 0 72px;padding:36px 0 40px;border-block:1px solid var(--line);display:grid;grid-template-columns:180px minmax(0,840px);column-gap:clamp(48px,6vw,96px);justify-content:space-between}.ritel-theme .route-picker h2{margin:0}fieldset{border:0;margin:0;padding:0;min-width:0}#route-choice{display:grid;grid-template-columns:1.25fr 1fr;gap:44px}.route-option{padding:0 0 20px;border-bottom:1px solid transparent;display:flex;flex-direction:column;cursor:pointer}.route-option:has(input:checked){border-color:var(--fg)}.route-title{display:flex;align-items:center;gap:12px;font-size:19px;line-height:1.5}.route-title input{width:17px;height:17px;margin:0;accent-color:var(--fg);flex:0 0 17px}.route-description{display:block;color:var(--muted);font-size:15px;margin:16px 0 0;line-height:1.8}.route-requirement{display:block;font-size:15px;margin-top:16px;line-height:1.8}.route-picker noscript{grid-column:2}
.contents{grid-column:1;align-self:start;position:sticky;top:120px;padding:0;display:flex;flex-direction:column;gap:6px;font-size:15px}.contents a{display:block;text-decoration:none;padding:8px 0;color:var(--muted)}.contents a:hover{color:var(--fg);text-decoration:underline;text-decoration-thickness:1px}.guide-body{grid-column:2;min-width:0}.part{padding:0 0 72px;margin:0 0 72px;border-bottom:1px solid var(--line)}.part:last-child{border:0;margin-bottom:0}.intro{color:var(--muted);font-size:19px;line-height:1.8;margin:0 0 32px;max-width:70ch}.note,.tip{padding:20px 0;border-block:1px solid var(--line);color:var(--muted);font-size:16px;margin:32px 0}.note strong{display:block;margin-bottom:8px}
.cards{display:block}.ritel-theme .card{border-radius:0;display:grid;grid-template-columns:36px minmax(0,1fr) minmax(160px,.8fr);gap:12px 22px;padding:32px 0;border-top:1px solid var(--line);align-items:start}.card:last-child{border-bottom:1px solid var(--line)}.icon{grid-column:1;grid-row:1/3;width:32px;height:32px;color:var(--fg)}.icon img,.icon svg{display:block;width:32px;height:32px}.ritel-theme .card h3{grid-column:2;margin:0}.card-summary{grid-column:2;color:var(--muted);margin:0;font-size:15px}.filemeta{grid-column:3;grid-row:1/3;font-size:13px;margin:0}.filemeta>div{display:grid;grid-template-columns:74px 1fr;gap:10px;padding:4px 0}dt{color:var(--muted)}dd{margin:0}.btn{min-height:var(--ritel-field-height);padding:10px 20px;border:1px solid var(--fg);display:inline-flex;align-items:center;justify-content:center;font-size:15px;text-decoration:none;transition:background .15s,color .15s}.btn-solid{background:var(--ritel-control-fill);color:var(--ritel-on-control);grid-column:2;justify-self:start;margin-top:8px}.btn:hover{background:var(--ritel-control-hover);color:var(--ritel-on-control)}.ext{grid-column:3;align-self:center;font-size:14px;color:var(--muted)}.platforms{padding:36px 0 0}.platforms-head{font-size:18px;margin:0 0 16px}.platforms dl{margin:16px 0}.platforms dl>div{display:grid;grid-template-columns:136px 1fr;gap:24px;padding:12px 0;border-bottom:1px solid var(--line);font-size:14px}.platforms dd{display:flex;flex-wrap:wrap;gap:12px}.platforms em{font-style:normal;color:var(--muted)}.platforms .os{min-width:120px}.platforms-note{color:var(--muted);font-size:14px;margin:24px 0 0}
.settings-list{padding-left:24px}li{padding:6px 0}.shot{display:block;width:100%;padding:0;margin:32px auto;border:0;background:transparent;overflow:hidden;cursor:zoom-in}.shot img{display:block;width:100%}.shot-narrow{max-width:360px}.migration{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:40px}summary{padding:24px 0;cursor:pointer;font-size:20px;line-height:1.5}.details-body{padding-bottom:8px}.details-body ol{padding-left:24px}code{font-family:var(--ritel-mono);font-size:.88em;background:var(--ritel-surface-inset);padding:2px 4px;overflow-wrap:anywhere;font-variant-numeric:lining-nums tabular-nums}.ritel-theme pre{padding:24px 0;background:transparent;overflow:auto;border-block:1px solid var(--line);border-radius:0;max-width:100%;line-height:1.7}pre code{padding:0;background:none;font-size:14px;white-space:pre}.qa{margin-top:32px}.qa article{padding:28px 0;border-top:1px solid var(--line)}.qa p{color:var(--muted);margin:0}footer{border-top:1px solid var(--line);padding:32px 0;color:var(--muted);font-size:14px}.footer-inner,.footer-links{display:flex;flex-wrap:wrap;gap:16px 32px;justify-content:space-between}footer p{margin:0}footer a{color:var(--muted);text-decoration:none}
 dialog{width:min(96vw,1480px);max-height:94vh;padding:64px 24px 24px;border:1px solid var(--line);background:var(--bg);color:var(--fg)}dialog::backdrop{background:rgba(0,0,0,.85)}dialog img{display:block;max-width:100%;max-height:calc(94vh - 160px);margin:auto;object-fit:contain}dialog p{text-align:center;color:var(--muted);font-size:15px;margin:24px 0 0}.lightbox-close{position:absolute;top:12px;right:16px;width:44px;height:44px;padding:0;border:1px solid var(--line);background:var(--bg);font-size:28px;cursor:pointer}body.dialog-open{overflow:hidden}
@media(max-width:1100px){:root{--pad:32px}.topbar nav{gap:16px}.guide-layout,.route-picker{grid-template-columns:144px minmax(0,1fr);column-gap:40px}.guide-heading{padding:72px 0 48px}#route-choice{gap:28px}.card{column-gap:16px}}
@media(max-width:760px){:root{--pad:20px}html{scroll-padding-top:154px}body{font-size:16px}.topbar-inner{min-height:72px;flex-wrap:wrap;gap:0;padding-top:16px;padding-bottom:8px}.brand img{width:36px;height:29px}.brand span{font-size:22px}.topbar nav{gap:20px;font-size:14px;width:100%;justify-content:flex-start;overflow-x:auto;padding-top:12px;white-space:nowrap}.theme-select{flex-shrink:0;max-width:116px}.guide-layout{display:block}.guide-heading{padding:56px 0 40px}.lede{font-size:18px;margin-top:24px}.route-picker{display:block;padding:28px 0;margin-bottom:28px}.ritel-theme .route-picker h2{margin-bottom:24px}#route-choice{grid-template-columns:1fr;gap:24px}.route-option{padding-bottom:18px}.route-title{font-size:18px}.contents{position:static;flex-direction:row;flex-wrap:wrap;gap:4px 20px;font-size:14px;padding:0 0 24px;margin-bottom:36px;border-bottom:1px solid var(--line)}.contents a{padding:6px 0}.part{padding-bottom:44px;margin-bottom:44px}.ritel-theme h2{margin-bottom:20px}.intro{font-size:18px}.ritel-theme .card{grid-template-columns:32px minmax(0,1fr);gap:10px 16px;padding-block:28px}.filemeta{grid-column:2;grid-row:auto;margin-top:6px}.ext{grid-column:2;justify-self:start}.platforms dl>div{grid-template-columns:1fr;gap:4px}.platforms .os{min-width:112px}.footer-inner{flex-direction:column}.footer-links{justify-content:flex-start}dialog{padding:64px 16px 24px}dialog p{font-size:14px}}
@media print{.topbar,.contents,.language-switch,.theme-select{display:none}.guide-layout{display:block}body{background:white;color:black}.part{break-inside:avoid}.shot{max-width:600px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
.ritel-theme .theme-select{border-radius:0}
.contents a[aria-current="location"]{color:var(--fg);text-decoration:underline;text-decoration-thickness:1px}