:root{--blue:#234dd8;--blue-dark:#1637a5;--ink:#192b50;--body:#374761;--muted:#5c6980;--line:#dce3ee;--soft:#f3f6fc;--pale:#eaf0ff;--white:#fff;--focus:#a25400;--warning:#704a00;--warning-bg:#fff6df;--radius:10px;--display:"Avenir Next","Segoe UI","PingFang SC",sans-serif;--font:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;--mono:"SFMono-Regular",Consolas,monospace;color-scheme:light;font-family:var(--font);font-size:16px;color:var(--body);background:var(--white);scroll-behavior:smooth;scrollbar-color:#9baac4 var(--soft);scrollbar-width:thin;scroll-padding-top:100px}
*{box-sizing:border-box}body{margin:0;line-height:1.85}a{color:var(--blue);text-underline-offset:4px}button,input,a,summary{-webkit-tap-highlight-color:transparent}a:hover{color:var(--blue-dark)}a:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:5px;border-radius:4px}::selection{background:#d9e3ff;color:var(--ink)}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:var(--soft)}::-webkit-scrollbar-thumb{background:#9baac4;border:2px solid var(--soft);border-radius:10px}::-webkit-scrollbar-thumb:hover{background:#70829e}
.skip{position:fixed;top:8px;left:12px;transform:translateY(-160%);z-index:20;background:var(--ink);color:var(--white);padding:10px 16px}.skip:focus{transform:translateY(0)}.site-header{border-bottom:1px solid var(--line);background:var(--white)}.header-inner{max-width:1200px;margin:auto;padding:21px 32px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--ink);font-size:20px;font-weight:750;line-height:1.35}.brand-mark{width:38px;height:38px;border-radius:10px;background:var(--blue);color:white;display:grid;place-items:center;font-family:var(--display);font-size:32px;line-height:1;padding-bottom:4px}.brand-domain{display:block;font-family:var(--mono);font-size:12px;font-weight:400;color:var(--muted);margin-top:4px}.header-nav{display:flex;gap:28px;font-size:14px}.header-nav a{color:var(--body);text-decoration:none}.header-nav a:hover{color:var(--blue)}main{max-width:1200px;margin:auto;padding:0 32px}.intro{padding:45px 0 36px;max-width:960px}.eyebrow,.step-label,.nav-caption{font-size:14px;font-weight:600;color:var(--muted);margin:0}.eyebrow{color:var(--blue);margin-bottom:12px}h1,h2{font-family:var(--display);color:var(--ink)}h1{font-size:clamp(28px,3.6vw,46px);line-height:1.35;letter-spacing:-.025em;font-weight:750;margin:0 0 16px}h1 span{color:var(--blue)}.intro>p{font-size:17px;margin:0 0 17px;line-height:1.8}.intro-meta{display:flex;flex-wrap:wrap;gap:8px 20px;color:var(--muted);font-size:13px}.intro-meta span+span{border-left:1px solid var(--line);padding-left:20px}.guide-layout{display:grid;grid-template-columns:224px minmax(0,1fr);gap:56px;align-items:start}.guide-aside{position:sticky;top:28px;padding-top:21px}.step-nav ol{list-style:none;padding:12px 0 0;margin:0}.step-nav li{margin-bottom:5px}.step-nav a{display:flex;align-items:center;gap:13px;padding:13px 14px;text-decoration:none;color:var(--body);font-size:15px;font-weight:600;border-radius:8px;line-height:1.5}.step-nav a:hover{background:var(--soft)}.step-nav a[aria-current="step"]{background:var(--pale);color:var(--blue)}.nav-number{font-family:var(--mono);font-size:14px;color:var(--muted);border:1px solid var(--line);border-radius:7px;min-width:31px;height:31px;display:grid;place-items:center;font-weight:500;background:white}.step-nav a[aria-current] .nav-number{border-color:var(--blue);color:var(--blue)}.step-nav small{display:block;margin-top:3px;font-size:12px;font-weight:400;color:var(--muted)}.aside-note{border-top:1px solid var(--line);padding-top:18px;margin:20px 14px 0;font-size:13px;color:var(--muted)}.nav-caption{padding-left:14px}.guide-content{min-width:0}.step{border-top:1px solid var(--line);padding:33px 0 36px;scroll-margin-top:24px}.section-heading{display:flex;align-items:center;gap:16px;margin-bottom:17px}.step-number{font-family:var(--mono);font-size:18px;font-weight:500;display:grid;place-items:center;align-self:flex-start;margin-top:4px;flex-shrink:0;width:47px;height:47px;border-radius:var(--radius);color:var(--blue);background:var(--pale)}h2{font-size:25px;line-height:1.5;font-weight:700;letter-spacing:-.02em;margin:2px 0 0}.step>p{margin:16px 0}.step strong{font-weight:650;color:var(--ink)}.platform-picker{border:0;padding:0;margin:25px 0 16px;min-width:0}.platform-picker legend{font-size:14px;color:var(--muted);margin-bottom:10px}.platform-options{display:flex;flex-wrap:wrap;gap:7px}.platform-options label{position:relative;cursor:pointer;display:block}.platform-options input{position:absolute;inset:0;width:100%;height:100%;opacity:0;margin:0;cursor:pointer}.platform-options span{display:block;padding:7px 23px;border:1px solid var(--line);border-radius:8px;color:var(--body);font-family:var(--display);font-size:15px;line-height:1.75;font-weight:600;transition:background .15s,border-color .15s}.platform-options input:checked+span{color:var(--blue);border-color:var(--blue);background:var(--pale)}.platform-options label:hover span{border-color:var(--blue)}.platform-options input:focus-visible+span{outline:3px solid var(--focus);outline-offset:3px}.platform-panel{margin-top:18px}.platform-panel[hidden]{display:none}.platform-panel>p:first-child{margin:0 0 14px}.instructions{margin:16px 0 24px;padding-left:24px}.instructions li{padding-left:5px;margin:10px 0;overflow-wrap:anywhere}.instructions li::marker{color:var(--blue);font-family:var(--mono);font-size:14px;font-weight:600}code{font-family:var(--mono);font-size:.875em;border-radius:4px;padding:2px 6px;background:var(--soft);color:var(--ink)}.actions{display:flex;align-items:center;flex-wrap:wrap;gap:12px 18px;margin:22px 0 16px}.button{display:inline-flex;justify-content:center;align-items:center;min-height:46px;padding:10px 20px;border-radius:8px;border:1px solid var(--blue);font-size:14px;font-weight:650;line-height:1.6;text-decoration:none;transition:background .15s,box-shadow .15s}.button.primary{background:var(--blue);color:var(--white)}.button.primary:hover{background:var(--blue-dark);border-color:var(--blue-dark)}.button.secondary{background:var(--white);color:var(--blue)}.button.secondary:hover{background:var(--pale)}.button:active{box-shadow:inset 0 0 0 2px #192b5033}.text-link{font-size:14px;font-weight:500}.micro{font-size:14px;color:var(--muted);line-height:1.8;margin:16px 0}.note{background:var(--soft);border-left:3px solid #aabce5;border-radius:0 8px 8px 0;padding:16px 18px;margin:24px 0;font-size:15px;line-height:1.85}.note.caution{background:var(--warning-bg);border-color:#c39846;color:var(--warning)}.note.caution strong{color:var(--warning)}.checkpoint{display:flex;gap:10px;color:var(--body);font-size:14px;margin-top:24px}.checkpoint>span:first-child{font-size:16px;font-weight:750;color:var(--blue)}.step .source{font-size:12px;line-height:1.85;color:var(--muted);margin:12px 0 0;overflow-wrap:anywhere}.flow{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;padding:16px 20px;margin:23px 0;background:var(--pale);border-radius:8px;font-size:14px;font-weight:600;color:var(--ink)}.flow-divider{color:#7283a6;font-weight:400}.optional-tag{display:inline-block;vertical-align:middle;margin-left:7px;border:1px solid var(--line);padding:1px 8px;border-radius:5px;font-size:12px;letter-spacing:0;color:var(--muted);font-family:var(--font);font-weight:500}.faq{border-top:1px solid var(--line);padding:34px 0;scroll-margin-top:24px}.faq h2{margin-bottom:22px}.faq details{border-top:1px solid var(--line)}.faq details:last-of-type{border-bottom:1px solid var(--line)}.faq summary{font-size:16px;color:var(--ink);padding:16px 2px;cursor:pointer;font-weight:550;line-height:1.75}.faq summary:hover{color:var(--blue)}.faq details p{margin:0;padding:0 2px 20px;color:var(--body);font-size:15px;line-height:1.9}.footer{border-top:1px solid var(--line);padding:24px 0 36px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:6px 20px;font-size:12px;color:var(--muted)}.footer p{flex-basis:100%;margin:6px 0 0}.noscript-note{max-width:1100px;margin:20px auto;padding:20px;background:var(--soft);font-size:14px}.not-found{min-height:70vh;max-width:760px;margin:auto;padding:70px 24px}.not-found p{margin-bottom:24px}
.mobile-label{display:none}
@media(min-width:1000px){.step:first-child{background:linear-gradient(180deg,#f7f9ff 0%,#fff 100%);padding:28px 28px 30px;border:1px solid var(--line);border-radius:12px;margin-bottom:32px}.step:nth-child(2){border-top:0;padding-top:5px}}
@media(max-width:900px){.guide-layout{grid-template-columns:180px minmax(0,1fr);gap:28px}main,.header-inner{padding-left:24px;padding-right:24px}.step-nav a{padding-left:8px;padding-right:8px}.nav-caption{padding-left:8px}.aside-note{margin-left:8px;margin-right:8px}.section-heading{gap:13px}.step-number{width:42px;height:42px}h2{font-size:23px}}
@media(max-width:700px){:root{scroll-padding-top:125px}.header-inner{padding:17px 20px}.header-nav{gap:17px;font-size:13px}.brand{font-size:18px}.brand-domain{font-size:11px}.brand-mark{width:34px;height:34px;font-size:28px}main{padding:0 20px}.intro{padding:29px 0 25px}.intro>p{font-size:16px;margin-bottom:13px}.intro-meta{gap:6px 12px;font-size:12px}.intro-meta span+span{padding-left:12px}.guide-layout{display:block}.guide-aside{position:sticky;top:0;padding:0;margin:0 -20px;z-index:3;background:var(--white);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.nav-caption,.aside-note,.step-nav small{display:none}.step-nav ol{padding:10px 16px;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:2px}.step-nav li{margin:0}.step-nav a{flex-direction:column;gap:5px;padding:5px 1px 7px;text-align:center;font-size:11px;font-weight:500;line-height:1.5}.nav-number{border:0;font-size:13px;width:26px;min-width:26px;height:25px;background:transparent}.step-nav a[aria-current] .nav-number{background:var(--blue);color:white;border-radius:5px}.step{padding:29px 0;scroll-margin-top:108px}.section-heading{gap:12px;margin-bottom:14px}.step-label{font-size:12px}.step-number{width:38px;height:38px;font-size:16px}.step h2{font-size:22px}.instructions{padding-left:22px}.instructions li{padding-left:3px}.platform-options span{padding:7px 20px;font-size:14px}.button{padding:10px 16px}.actions{gap:10px 15px}.note{padding:14px 15px;margin:21px 0;font-size:14px}.flow{justify-content:flex-start;gap:8px;padding:14px;font-size:13px}.checkpoint{font-size:13px}.faq{scroll-margin-top:108px}.footer{padding-bottom:28px}.optional-tag{margin-left:2px}.footer>span{flex-basis:100%}}
@media(max-width:360px){main{padding:0 16px}.header-inner{padding-left:16px;padding-right:16px}.header-nav{gap:12px;font-size:12px}.brand-domain{font-size:10px}.intro-meta{gap:6px 10px}.intro-meta span+span{padding-left:10px}.guide-aside{margin-left:-16px;margin-right:-16px}.step-nav ol{padding-left:10px;padding-right:10px}.step h2{font-size:20px}.step-number{width:34px;height:34px}.section-heading{gap:10px}.actions .button{width:100%}.platform-options span{padding-left:16px;padding-right:16px}}
@media(max-width:700px){.full-label{display:none}.mobile-label{display:inline}.step-nav a{font-size:14px}.step,.faq{scroll-margin-top:0}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}
@media(forced-colors:active){:root{scrollbar-color:auto}.button,.platform-options span,.step-number,.nav-number{border:1px solid CanvasText}.step-nav a[aria-current="step"]{outline:2px solid Highlight}}