:root{color-scheme:light;--ink:#0d0d0d;--body:#181818;--muted:#5d5d5d;--canvas:#fff;--surface:#f7f7f7;--line:#e2e2e2;--focus:#181818;--font:"OpenAI Sans","Noto Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}
*,*::before,*::after{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--canvas);color:var(--body);font:400 16px/1.65 var(--font);letter-spacing:-.16px}a{color:inherit;text-underline-offset:3px;text-decoration-thickness:1px}a:hover{text-decoration-thickness:2px}a:focus-visible,summary:focus-visible{outline:2px solid var(--focus);outline-offset:4px;border-radius:2px}.skip-link{position:absolute;left:16px;top:-80px;z-index:90;padding:10px 16px;background:var(--ink);color:#fff;border-radius:9999px;text-decoration:none}.skip-link:focus{top:12px}.wrap{width:min(1120px,calc(100% - 48px));margin-inline:auto}
.top{background:var(--canvas);border-bottom:1px solid var(--line)}.top .wrap{min-height:76px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{font-size:16px;line-height:1.5;font-weight:600;letter-spacing:-.16px;text-decoration:none;white-space:nowrap}.top nav{display:flex;align-items:center;gap:32px}.top nav a{font-size:14px;font-weight:500;line-height:1.43;letter-spacing:-.14px;text-decoration:none;white-space:nowrap}.top nav a:hover,.top nav a[aria-current="page"]{text-decoration:underline;text-underline-offset:5px}.nav-menu{display:none}
.hero{border-bottom:1px solid var(--line);background:var(--canvas)}.hero .wrap{padding-block:72px 80px}.eyebrow{margin:0;color:var(--muted);font-size:14px;font-weight:600;line-height:1.43;letter-spacing:-.14px}h1,h2,h3{color:var(--ink);font-weight:600}h1{max-width:850px;margin:20px 0 24px;font-size:clamp(40px,4vw,56px);line-height:1.18;letter-spacing:-.02em}h2{margin:0 0 16px;font-size:30px;line-height:1.4;letter-spacing:-.6px}h3{margin:0 0 12px;font-size:18px;line-height:1.61;letter-spacing:-.18px}.lead{max-width:760px;margin:0;color:#282828;font-size:18px;line-height:1.65;letter-spacing:-.18px}.meta{margin:28px 0 0;color:var(--muted);font-size:14px;line-height:1.43;letter-spacing:-.14px}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 20px;border:1px solid var(--body);border-radius:9999px;background:var(--body);color:#fff;font-size:14px;font-weight:500;line-height:1.43;letter-spacing:-.14px;text-decoration:none}.button:hover{background:#303030;color:#fff;text-decoration:none}.button:active{transform:scale(.98)}.button.secondary{background:transparent;color:var(--body)}.button.secondary:hover{background:rgba(24,24,24,.06);color:var(--body)}.button.light{background:#fff;border-color:#fff;color:var(--ink)}.button.light:hover{background:#eee;border-color:#eee;color:var(--ink)}.button:focus-visible{outline:2px solid var(--focus);outline-offset:3px}.button.light:focus-visible{outline-color:#fff}
.section{padding-block:80px}.section.alt{background:var(--surface);border-block:1px solid var(--line)}.section-head{display:flex;justify-content:space-between;align-items:end;gap:48px;margin-bottom:32px}.section-intro{max-width:640px;margin:0;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.card{display:flex;flex-direction:column;min-height:300px;padding:32px;background:var(--surface);border:1px solid var(--line);border-radius:12px}.card:hover{border-color:#a7a7a7}.tag{display:inline-flex;align-self:flex-start;padding:6px 12px;margin-bottom:24px;border:1px solid #d3d3d3;border-radius:9999px;color:#282828;font-size:14px;font-weight:500;line-height:1.43;letter-spacing:-.14px}.card p{margin:0 0 20px;color:#282828}.card ul{margin:0 0 24px;padding-left:20px;color:#282828;font-size:14px;line-height:1.7}.card li+li{margin-top:8px}.card .more{align-self:flex-start;margin-top:auto;font-size:14px;font-weight:600;line-height:1.43;text-decoration:none;border-bottom:1px solid currentColor}.card .more:hover{border-bottom-width:2px}
.feature{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:end;gap:32px;margin-top:16px;padding:40px;background:var(--body);color:#f6f6f6;border-radius:12px}.feature h3{color:#fff;font-size:26px;line-height:1.4;letter-spacing:-.52px}.feature p{max-width:690px;margin:0;color:#d1d1d1}.feature .tag{color:#f6f6f6;border-color:#5d5d5d}.feature .actions{display:flex;flex-direction:column;gap:12px;align-items:stretch}.feature .actions a:last-child{font-size:14px;text-align:center}.feature .actions a:focus-visible{outline-color:#fff}
.steps{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 40px;border-top:1px solid var(--line)}.step{padding:28px 0;border-bottom:1px solid var(--line)}.step strong{display:block;margin-bottom:8px;font-size:18px;font-weight:600;line-height:1.61;letter-spacing:-.18px}.step p{max-width:500px;margin:0;color:#282828}.notice{max-width:860px;padding:24px 28px;background:var(--surface);border:1px solid var(--line);border-radius:12px;color:#282828}.notice strong{color:var(--ink)}
.article{max-width:760px;padding-block:64px 96px}.article .back{display:inline-block;margin-bottom:48px;font-size:14px;font-weight:500;text-decoration:none}.article .back:hover{text-decoration:underline}.article h1{font-size:clamp(36px,5vw,56px);line-height:1.15;letter-spacing:-.02em}.article .lead{font-size:18px}.article .meta{padding-bottom:40px;border-bottom:1px solid var(--line)}.article h2{margin:48px 0 16px;font-size:26px;line-height:1.5;letter-spacing:-.52px;scroll-margin-top:24px}.article h3{margin-top:32px}.article p,.article li{line-height:1.85}.article p{margin:0 0 20px}.article ol{margin:0 0 24px;padding-left:24px}.article li{padding-left:4px;margin-bottom:12px}.article .notice{margin-top:48px}.article .notice p{margin:0}.article .notice p+p{margin-top:12px}.checklist li::marker{font-weight:600}
.footer{border-top:1px solid var(--line);background:var(--surface);color:var(--muted);font-size:14px;line-height:1.71}.footer .wrap{display:flex;justify-content:space-between;gap:24px;padding-block:32px}.footer p{max-width:760px;margin:0}
@media(max-width:1023px){.top nav{display:none}.nav-menu{display:block;position:relative}.nav-menu summary{display:flex;align-items:center;justify-content:center;min-width:64px;min-height:44px;padding:8px 16px;border:1px solid var(--line);border-radius:9999px;list-style:none;cursor:pointer;font-size:14px;font-weight:500}.nav-menu summary::-webkit-details-marker{display:none}.nav-menu[open] .menu-links{position:absolute;right:0;top:52px;z-index:10;display:flex;flex-direction:column;min-width:190px;padding:8px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 2px 4px -1px rgba(0,0,0,.08)}.menu-links a{padding:10px 12px;text-decoration:none;font-size:14px}.menu-links a:hover,.menu-links a[aria-current="page"]{background:var(--surface);border-radius:8px}.hero .wrap{padding-block:64px 72px}h1{font-size:42px}}
@media(max-width:767px){.wrap{width:calc(100% - 32px)}.top .wrap{min-height:68px}.hero .wrap{padding-block:64px 72px}h1{font-size:30px;line-height:1.25;letter-spacing:-.6px}.lead{font-size:16px;line-height:1.7}.section{padding-block:64px}.section-head{display:block}.section-intro{margin-top:8px}.grid,.steps{grid-template-columns:1fr}.card{min-height:0;padding:24px}.feature{grid-template-columns:1fr;padding:28px 24px}.feature .actions{align-items:flex-start}.article{padding-block:40px 72px}.article .back{margin-bottom:32px}.article h1{font-size:30px}.article .meta{padding-bottom:32px}.article h2{margin-top:40px}.footer .wrap{flex-direction:column}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button:active{transform:none}}