:root{--ink:#24303a;--muted:#66717a;--dark:#111a22;--panel:#19252f;--paper:#f3f0e8;--paper2:#eae5da;--light:#f5f1e8;--accent:#b8894f;--line:rgba(36,48,58,.18);--radius:12px}*{box-sizing:border-box}html{scroll-behavior:smooth;overflow-x:hidden}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.82;overflow-x:hidden}a{color:inherit;text-decoration-thickness:1px;text-underline-offset:4px}button{font:inherit}.wrap{width:min(1180px,calc(100% - 60px));margin:auto}.skip-link{position:absolute;left:-9999px}.skip-link:focus{left:16px;top:16px;z-index:99;background:#fff;padding:8px}.site-header{background:var(--paper);border-bottom:1px solid var(--line)}.brand-bar{height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;align-items:center;gap:14px;text-decoration:none;min-width:0}.brand-logo{max-width:136px;max-height:38px;width:auto;height:auto;object-fit:contain}.brand-copy{display:flex;flex-direction:column;line-height:1.25}.brand-copy strong{font-size:19px;letter-spacing:.04em}.brand-copy small{font-size:11px;color:var(--muted);letter-spacing:.12em}.brand-actions{display:flex;align-items:center;gap:20px}.brand-actions a{text-decoration:none}.menu-button,.mobile-menu-open,.drawer-close,.nav-trigger{border:1px solid var(--line);background:transparent;color:inherit;border-radius:9px;padding:9px 13px;cursor:pointer}.section-nav{background:var(--dark);color:var(--light)}.nav-row{height:48px;display:flex;align-items:stretch;gap:4px}.nav-row>a,.nav-group{position:relative;display:flex;align-items:center}.nav-row>a,.nav-trigger{padding:0 18px;text-decoration:none;border:0;border-radius:0;color:var(--light);background:transparent}.nav-row .active{box-shadow:inset 0 -3px 0 var(--accent)}.nav-popover{position:absolute;top:100%;left:0;min-width:190px;background:var(--panel);padding:8px;border:1px solid rgba(255,255,255,.1);display:none;z-index:20}.nav-group:hover .nav-popover,.nav-group:focus-within .nav-popover,.nav-group.expanded .nav-popover{display:grid}.nav-popover a{padding:9px 10px;text-decoration:none;color:var(--light)}.breadcrumb{padding-top:18px;font-size:13px;color:var(--muted);display:flex;gap:8px;flex-wrap:wrap}.page-hero,.section{padding:62px 0}.page-hero h1,.home-hero h1{font-size:clamp(34px,4vw,38px);line-height:1.22;margin:0 0 18px;max-width:850px}.lead{font-size:17px;max-width:780px;color:#4b5861}.article{width:min(760px,calc(100% - 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@media(max-width:620px){body{padding-bottom:62px}.wrap,.article{width:calc(100% - 32px)}.brand-bar{height:62px}.brand-copy small{display:none}.brand-logo{max-width:112px;max-height:32px}.home-hero{padding:40px 0}.home-hero-grid{grid-template-columns:1fr;gap:24px}.home-hero h1,.page-hero h1{font-size:28px}.article h2{font-size:22px;margin-top:40px}.flow,.mini-grid,.footer-grid{grid-template-columns:1fr}.step{grid-template-columns:52px 1fr;gap:14px}.step-num{font-size:26px}.mobile-bottom{position:fixed;display:grid;grid-template-columns:repeat(4,1fr);left:0;right:0;bottom:0;height:60px;padding-bottom:env(safe-area-inset-bottom);background:var(--dark);z-index:40;color:#fff}.mobile-bottom a,.mobile-bottom button{display:grid;place-items:center;border:0;background:transparent;color:#fff;text-decoration:none;min-width:44px;min-height:44px;padding:0}.footer-note{padding-bottom:26px}.hero-image{max-height:200px}.content-image{max-height:240px}.app-image{max-width:190px;max-height:300px}.buttons .button{width:100%;text-align:center}.brand-actions{gap:8px}.menu-button{padding:8px 10px}.page-hero,.section{padding:36px 0}.panel{padding:18px}.site-footer{margin-top:42px}}