:root{--brand: #0071e3;--brand-deep: #0077ed;--brand-soft: #e8f2fd;--ink: #1d1d1f;--ink-2: #6e6e73;--muted: #86868b;--line: rgba(0, 0, 0, .08);--bg: #ffffff;--bg-alt: #f5f5f7;--card: #ffffff;--green: #1d7a3a;--orange: #f08c2b;--radius: 18px;--ease: cubic-bezier(.4, 0, .2, 1);--shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 6px 20px -8px rgba(0, 0, 0, .08)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:84px}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,SF Pro Text,Helvetica Neue,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Noto Sans CJK SC,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.wrap{max-width:1080px;margin:0 auto;padding:0 24px}.nav{position:sticky;top:0;z-index:20;display:flex;justify-content:center;padding:12px 24px;pointer-events:none}.nav .wrap{pointer-events:auto;display:flex;align-items:center;justify-content:space-between;gap:24px;width:100%;max-width:860px;height:52px;margin:0;padding:0 8px 0 18px;border-radius:999px;background:#ffffffd1;border:1px solid rgba(0,0,0,.06);box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -2px #0000001a;backdrop-filter:saturate(180%) blur(24px);-webkit-backdrop-filter:saturate(180%) blur(24px);transition:max-width .5s var(--ease),background-color .5s var(--ease),border-color .5s var(--ease),box-shadow .5s var(--ease)}.nav.top .wrap{max-width:1200px;background:#fff0;border-color:transparent;box-shadow:none;backdrop-filter:none;-webkit-backdrop-filter:none}.brand{display:flex;align-items:center;gap:9px;font-weight:600;font-size:16px;letter-spacing:-.2px;white-space:nowrap}.brand img{width:28px;height:28px;border-radius:7px}.brand small{font-weight:500;font-size:12px;color:var(--muted);letter-spacing:0}.nav-links{display:flex;align-items:center;gap:24px;font-size:14px;font-weight:600}.nav-links a:not(.btn){opacity:.8;transition:opacity .2s}.nav-links a:not(.btn):hover{opacity:1}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:48px;padding:0 28px;border-radius:999px;font-weight:500;font-size:16px;white-space:nowrap;transition:background .2s,transform .2s}.btn:active{transform:scale(.97)}.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-deep)}.btn-ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1px #00000024}.btn-ghost[aria-disabled=true]{color:var(--muted);cursor:default}.btn-sm{height:36px;padding:0 18px;font-size:14px}.nav .btn-primary{background:var(--ink)}.nav .btn-primary:hover{background:#333336}.link{color:var(--brand);font-weight:500}.link:hover{text-decoration:underline}section{padding:112px 0}.alt{background:var(--bg-alt)}.section-head{text-align:center;max-width:680px;margin:0 auto 56px}.section-head h2{font-size:40px;line-height:1.25;letter-spacing:-.5px;margin:0;font-weight:600}.section-head p{color:var(--ink-2);font-size:17px;margin:14px 0 0}.num{display:block;margin-bottom:10px;font-size:14px;font-weight:600;color:var(--brand)}.grid{display:grid;gap:20px}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-2{grid-template-columns:repeat(2,1fr)}.card{background:var(--bg-alt);border-radius:var(--radius);padding:32px}.alt .card{background:var(--card);box-shadow:var(--shadow)}.card h3{margin:20px 0 8px;font-size:19px;font-weight:600;line-height:1.35}.card p{margin:0;color:var(--ink-2);font-size:15px}.card ul{margin:12px 0 0;padding-left:0;list-style:none;color:var(--ink-2);font-size:15px}.card li{padding-left:16px;position:relative;margin-top:6px}.card li:before{content:"";position:absolute;left:2px;top:11px;width:5px;height:5px;border-radius:50%;background:#c7c7cc}.tile{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-weight:600;font-size:16px;background:var(--card);color:var(--ink)}.alt .tile{background:var(--bg-alt)}.faq{max-width:780px;margin:0 auto}details{border-bottom:1px solid var(--line)}summary{cursor:pointer;list-style:none;padding:22px 0;font-size:18px;font-weight:600;display:flex;justify-content:space-between;gap:16px}summary::-webkit-details-marker{display:none}summary:after{content:"+";flex:none;font-weight:300;font-size:26px;line-height:1;color:var(--muted);transition:transform .25s var(--ease)}details[open] summary:after{transform:rotate(45deg)}details p{margin:0;padding:0 0 22px;color:var(--ink-2);font-size:16px}details a{color:var(--brand)}footer{border-top:1px solid var(--line);color:var(--muted);font-size:13px}footer .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 20px;padding-top:22px;padding-bottom:22px}footer nav{display:flex;flex-wrap:wrap;gap:8px 20px}footer a:hover{color:var(--ink)}@media(max-width:900px){.grid-3,.grid-2{grid-template-columns:1fr}.nav-links a:not(.btn){display:none}}@media(max-width:720px){section{padding:80px 0}.wrap{padding:0 20px}.nav{padding:10px 12px}.nav .wrap{padding:0 4px 0 14px}.section-head{margin-bottom:40px}.section-head h2{font-size:30px}.card{padding:26px}}.doc{max-width:780px;margin:0 auto;padding:56px 24px 64px}.doc h1{font-size:40px;line-height:1.2;letter-spacing:-.6px;margin:0 0 10px;font-weight:600}.doc .updated{color:var(--muted);font-size:14px;margin:0 0 32px}.doc h2{font-size:22px;letter-spacing:-.2px;margin:44px 0 12px;font-weight:600}.doc h3{font-size:17px;margin:24px 0 6px;font-weight:600}.doc p,.doc li{font-size:16px;color:#424245}.doc ul{padding-left:1.2em;margin:8px 0}.doc li{margin:4px 0}.doc a{color:var(--brand);text-decoration:underline;text-underline-offset:2px}.doc .summary{background:var(--bg-alt);border-radius:var(--radius);padding:22px 26px;margin:0 0 8px}.doc .summary li{margin:6px 0}.doc table{width:100%;border-collapse:collapse;margin:12px 0;font-size:14.5px;background:var(--card);border-radius:12px;overflow:hidden;box-shadow:inset 0 0 0 1px var(--line)}.doc th,.doc td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--line);vertical-align:top;color:#424245}.doc th{background:var(--bg-alt);color:var(--ink);font-weight:600}.doc tr:last-child td{border-bottom:none}.doc .table-wrap{overflow-x:auto}@media(max-width:720px){.doc{padding:36px 20px 48px}.doc h1{font-size:30px}}.doc .crumbs{margin:0 0 14px;font-size:13px;color:var(--muted)}.doc .crumbs a{color:var(--muted);text-decoration:none}.doc .crumbs a:hover{color:var(--ink)}.doc ol li,.doc ul li{margin:6px 0}.guide-list{list-style:none;padding:0;margin:28px 0;display:grid;gap:12px}.guide-list a{display:block;padding:20px 24px;border-radius:var(--radius);background:var(--bg-alt);color:var(--ink);text-decoration:none;transition:background .2s}.guide-list a:hover{background:#ebebf0}.guide-list b{display:block;font-size:17px;font-weight:600;margin-bottom:4px}.guide-list span{display:block;font-size:14px;color:var(--ink-2);line-height:1.6}