.surface{--sf-heading:#f5f7fa;--sf-text:#c9d6e3;--sf-muted:#8b9cb0;--sf-accent:#4cc9f0;--sf-link:#5ac8fa;--sf-tile:#0e1d33;--sf-tile-strong:#122643;--sf-divider:#94a3b829;--sf-button:#2997ff;--sf-button-text:#fff;--sf-positive:#30d158;--sf-negative:#ff6961;--sf-warning:#ffb340;--sf-info:#4cc9f0;--sf-neutral:#98a2b3;width:min(100%,980px);color:var(--sf-text);overflow-wrap:anywhere;margin-inline:auto;font-size:1.0625rem;line-height:1.7}html[data-theme=light] .surface{--sf-heading:#1d1d1f;--sf-text:#333a44;--sf-muted:#6e6e73;--sf-accent:#0071e3;--sf-link:#06c;--sf-tile:#f5f5f7;--sf-tile-strong:#ececf0;--sf-divider:#d2d2d7;--sf-button:#0071e3;--sf-button-text:#fff;--sf-positive:#1a7f37;--sf-negative:#d70015;--sf-warning:#b25000;--sf-info:#0071e3;--sf-neutral:#6e6e73}html[lang^=zh] .surface,html[lang^=ja] .surface,html[lang^=ko] .surface{line-height:1.8}.surface-hero{padding-block:clamp(2.5rem,7vw,4.5rem) 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a:hover{background:var(--sf-tile-strong);color:var(--sf-heading)}.surface-glance{grid-template-columns:minmax(0,1fr);gap:.75rem;margin:0 0 1rem;display:grid}.surface-tile{background:var(--sf-tile);border-radius:18px;min-width:0;padding:1.5rem 1.4rem}.surface-tile-icon{color:var(--sf-accent);display:inline-flex}.surface-tile dt,.surface-tile h3{color:var(--sf-muted);margin:.75rem 0 0;font-size:.85rem;font-weight:500}.surface-tile dd,.surface-tile .surface-tile-value{color:var(--sf-heading);margin:.3rem 0 0;font-size:1.2rem;font-weight:600;line-height:1.35}.surface-tile p,.surface-tile dd small{color:var(--sf-muted);margin:.5rem 0 0;font-size:.88rem;font-weight:400;line-height:1.6;display:block}.surface-tile .surface-more{margin-top:.75rem;font-size:.92rem}.surface-section{border-top:1px solid var(--sf-divider);padding-block:clamp(2.25rem,5vw,3.5rem);scroll-margin-top:1.5rem}.surface-section-header{max-width:46rem}.surface-section-header h2{color:var(--sf-heading);letter-spacing:-.01em;margin:0;font-size:clamp(1.6rem,3.2vw,2.1rem);font-weight:600;line-height:1.25}.surface-section-header p{color:var(--sf-text);margin:.75rem 0 0;font-size:1.0625rem}.surface-section-body{margin-top:1.75rem}.surface-section-body:not(.surface-glance,.surface-help,.surface-cards,.surface-split)>*+*{margin-top:1.25rem}.surface-prose{max-width:46rem}.surface-prose p+p{margin-top:.9rem}.surface-prose a:not(.surface-btn):not(.surface-more){color:var(--sf-link)}.surface-cards{grid-template-columns:minmax(0,1fr);gap:.75rem;display:grid}.surface-card{background:var(--sf-tile);border-radius:18px;min-width:0;padding:1.35rem 1.35rem 1.4rem}.surface-card h3{color:var(--sf-heading);margin:0;font-size:1.05rem;font-weight:600;line-height:1.4}.surface-card p{color:var(--sf-text);margin:.5rem 0 0;font-size:.95rem;line-height:1.7}.surface-card .surface-card-label{color:var(--sf-muted);margin:0 0 .35rem;font-size:.8rem}.surface-checklist{gap:.75rem;margin:0;padding:0;list-style:none;display:grid}.surface-checklist li{color:var(--sf-text);padding-inline-start:1.9rem;font-size:1rem;line-height:1.7;position:relative}.surface-checklist li:before{background:var(--sf-positive);color:#fff;content:"✓";border-radius:999px;place-items:center;width:1.2rem;height:1.2rem;font-size:.7rem;font-weight:700;display:grid;position:absolute;inset-block-start:.28rem;inset-inline-start:0}.surface-checklist[data-tone=negative] li:before{background:var(--sf-negative);content:"✕"}.surface-checklist[data-tone=neutral] li:before{background:var(--sf-muted);content:"";width:.4rem;height:.4rem;inset-block-start:.7rem;inset-inline-start:.4rem}.surface-split{grid-template-columns:minmax(0,1fr);gap:.75rem;display:grid}.surface-split>div{background:var(--sf-tile);border-radius:18px;min-width:0;padding:1.4rem}.surface-split h3{color:var(--sf-heading);margin:0 0 1rem;font-size:1.05rem;font-weight:600}.surface-steps{counter-reset:sf-step;grid-template-columns:minmax(0,1fr);gap:1.5rem 2rem;margin:0;padding:0;list-style:none;display:grid}.surface-steps>li{counter-increment:sf-step;min-width:0}.surface-steps>li:before{color:var(--sf-accent);content:counter(sf-step);font-size:1.9rem;font-weight:600;line-height:1;display:block}.surface-steps h3{color:var(--sf-heading);margin:.75rem 0 0;font-size:1.05rem;font-weight:600}.surface-steps p{color:var(--sf-text);margin:.4rem 0 0;font-size:.95rem;line-height:1.7}.surface-badge{color:var(--sf-tone,var(--sf-neutral));white-space:nowrap;align-items:center;gap:.35rem;font-size:.85rem;font-weight:600;display:inline-flex}.surface-badge:before{content:"";background:currentColor;border-radius:999px;flex:none;width:.5rem;height:.5rem}.surface-badge[data-tone=positive]{--sf-tone:var(--sf-positive)}.surface-badge[data-tone=negative]{--sf-tone:var(--sf-negative)}.surface-badge[data-tone=warning]{--sf-tone:var(--sf-warning)}.surface-badge[data-tone=info]{--sf-tone:var(--sf-info)}.surface-callout{background:var(--sf-tile);color:var(--sf-text);border-radius:18px;padding:1.15rem 1.35rem;font-size:.95rem;line-height:1.75}.surface-callout strong{color:var(--sf-heading);margin-bottom:.25rem;font-size:1rem;display:block}.surface-callout[data-tone=warning] strong{color:var(--sf-warning)}.surface-callout[data-tone=negative] strong{color:var(--sf-negative)}.surface-table{overscroll-behavior-x:contain;overflow-x:auto}.surface .surface-table :where(thead,tbody,tr),.surface .surface-table tr:hover{background:0 0}.surface-table table{border-collapse:collapse;width:100%;font-size:.95rem}.surface-table :where(th,td){border-bottom:1px solid var(--sf-divider);color:var(--sf-text);text-align:start;vertical-align:top;padding:1rem 1rem 1rem 0;line-height:1.6}.surface-table thead th{border-bottom-color:var(--sf-muted);color:var(--sf-muted);padding-block:.6rem;font-size:.8rem;font-weight:600}.surface-table tbody th{color:var(--sf-heading);font-weight:600}.surface-table a{color:var(--sf-link)}.surface-table .surface-nowrap{white-space:nowrap}.surface-mono{font-variant-numeric:tabular-nums;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.9em}.surface-chips{flex-wrap:wrap;gap:.35rem;display:flex}.surface-chips code{background:var(--sf-tile);color:var(--sf-text);border-radius:6px;padding:.1rem .45rem;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.78rem}.surface-help{grid-template-columns:minmax(0,1fr);gap:.75rem;display:grid}.surface-faq details{border-bottom:1px solid var(--sf-divider);padding:1.1rem 0}.surface-faq details:first-child{border-top:1px solid var(--sf-divider)}.surface-faq summary{cursor:pointer;color:var(--sf-heading);justify-content:space-between;align-items:center;gap:1rem;font-size:1.05rem;font-weight:600;list-style:none;display:flex}.surface-faq summary::-webkit-details-marker{display:none}.surface-faq summary:after{color:var(--sf-link);content:"+";flex:none;font-size:1.4rem;font-weight:300;transition:transform .16s}.surface-faq details[open] summary:after{transform:rotate(45deg)}.surface-faq details p{max-width:46rem;color:var(--sf-text);margin:.65rem 0 0;font-size:.98rem;line-height:1.75}.surface-fineprint{border-top:1px solid var(--sf-divider);color:var(--sf-muted);padding-block:1.75rem 3rem;font-size:.8rem;line-height:1.7}.surface-fineprint p+p{margin-top:.6rem}@media (width>=640px){.surface-glance,.surface-cards,.surface-split,.surface-help,.surface-steps{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width>=900px){.surface-glance--4{grid-template-columns:repeat(4,minmax(0,1fr))}.surface-glance--3,.surface-cards--3,.surface-help{grid-template-columns:repeat(3,minmax(0,1fr))}.surface-steps--4{grid-template-columns:repeat(4,minmax(0,1fr))}}@media (width<=639px){.surface{font-size:1rem}.surface-table--stacked table,.surface-table--stacked :where(tbody,tr,th,td){width:100%;display:block}.surface-table--stacked thead{display:none}.surface-table--stacked tr{border-bottom:1px solid var(--sf-divider);padding:.9rem 0}.surface-table--stacked :where(th,td){border-bottom:0;padding:.2rem 0}.surface-table--stacked td[data-label]:before{color:var(--sf-muted);content:attr(data-label);font-size:.78rem;font-weight:600;display:block}}@media (prefers-reduced-motion:reduce){.surface *{transition-duration:.01ms!important}}