:root{--color-bg: #ffffff;--color-bg-soft: #f7f9fb;--color-bg-sidebar: #fbfcfd;--color-border: #e3e8ee;--color-text: #1f2933;--color-text-soft: #52606d;--color-text-mute: #7b8794;--color-accent: #0d7c8a;--color-accent-soft: #e6f4f5;--color-accent-dark: #0a5f6a;--color-link: #0d7c8a;--color-code-bg: #f1f5f8;--color-callout-bg: #f0f7ff;--color-callout-border: #2f80ed;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;--font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;--sidebar-w: 260px;--toc-w: 220px;--content-max: 760px;--header-h: 60px;--radius: 8px;--shadow-sm: 0 1px 2px rgba(16, 24, 40, .05);--shadow: 0 4px 16px rgba(16, 24, 40, .08)}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px);-webkit-text-size-adjust:100%}body{margin:0;font-family:var(--font-sans);font-size:16px;line-height:1.75;color:var(--color-text);background:var(--color-bg);text-rendering:optimizeLegibility}a{color:var(--color-link);text-decoration:none}a:hover{text-decoration:underline}img{max-width:100%;height:auto}h1,h2,h3,h4{line-height:1.3;color:var(--color-text);scroll-margin-top:calc(var(--header-h) + 16px)}h1{font-size:1.9rem;margin:0 0 .6em;font-weight:700}h2{font-size:1.4rem;margin:1.8em 0 .6em;font-weight:650;padding-bottom:.3em;border-bottom:1px solid var(--color-border)}h3{font-size:1.15rem;margin:1.4em 0 .5em;font-weight:600}code{font-family:var(--font-mono);font-size:.88em;background:var(--color-code-bg);padding:.15em .4em;border-radius:4px;color:var(--color-accent-dark)}pre{background:var(--color-code-bg);padding:1rem;border-radius:var(--radius);overflow-x:auto;border:1px solid var(--color-border)}pre code{background:none;padding:0;color:inherit}.site-header{position:sticky;top:0;z-index:50;height:var(--header-h);display:flex;align-items:center;gap:1rem;padding:0 1.25rem;background:#ffffffeb;backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid var(--color-border)}.site-header .brand{display:flex;align-items:center;gap:.55rem;font-weight:700;font-size:1.05rem;color:var(--color-text)}.site-header .brand:hover{text-decoration:none}.site-header .brand .logo{width:30px;height:30px;border-radius:7px;background:linear-gradient(135deg,var(--color-accent),var(--color-accent-dark));color:#fff;display:grid;place-items:center;font-size:.85rem;font-weight:700}.site-header .brand .sub{font-size:.75rem;color:var(--color-text-mute);font-weight:400}.site-header nav{margin-left:auto;display:flex;gap:1.1rem;font-size:.92rem}.site-header nav a{color:var(--color-text-soft)}.nav-toggle{display:none;background:none;border:1px solid var(--color-border);border-radius:6px;padding:.3rem .55rem;cursor:pointer;font-size:1.1rem;line-height:1}.docs-layout{display:grid;grid-template-columns:var(--sidebar-w) minmax(0,1fr) var(--toc-w);gap:0;max-width:1320px;margin:0 auto}.sidebar{border-right:1px solid var(--color-border);background:var(--color-bg-sidebar);padding:1.5rem 1rem 3rem;position:sticky;top:var(--header-h);align-self:start;height:calc(100vh - var(--header-h));overflow-y:auto}.sidebar .group-title{font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-mute);font-weight:600;margin:1.3rem 0 .4rem .6rem}.sidebar ul{list-style:none;margin:0 0 .5rem;padding:0}.sidebar li a{display:block;padding:.4rem .6rem;border-radius:6px;color:var(--color-text-soft);font-size:.92rem}.sidebar li a:hover{background:var(--color-accent-soft);text-decoration:none}.sidebar li a.active{background:var(--color-accent-soft);color:var(--color-accent-dark);font-weight:600}.sidebar a.hub-link{font-weight:600;color:var(--color-accent-dark)}.sidebar .region-group{margin-bottom:.2rem}.sidebar .region-group>summary{list-style:none;cursor:pointer;padding:.4rem .6rem;border-radius:6px;font-size:.85rem;font-weight:600;color:var(--color-text);display:flex;align-items:center;gap:.4rem}.sidebar .region-group>summary::-webkit-details-marker{display:none}.sidebar .region-group>summary:before{content:"▸";color:var(--color-text-mute);font-size:.7rem;transition:transform .15s}.sidebar .region-group[open]>summary:before{transform:rotate(90deg)}.sidebar .region-group>summary:hover{background:var(--color-accent-soft)}.sidebar .region-group .count{margin-left:auto;font-size:.72rem;font-weight:500;color:var(--color-text-mute);background:var(--color-bg-soft);border:1px solid var(--color-border);border-radius:999px;padding:0 .45rem}.sidebar .region-group ul{margin-left:.5rem}.content{padding:2rem 2.5rem 4rem;min-width:0}.content-inner{max-width:var(--content-max);margin:0 auto}.toc{padding:2rem 1rem 3rem;position:sticky;top:var(--header-h);align-self:start;height:calc(100vh - var(--header-h));overflow-y:auto;font-size:.85rem}.toc .toc-title{font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--color-text-mute);font-weight:600;margin-bottom:.6rem}.toc ul{list-style:none;margin:0;padding:0;border-left:2px solid var(--color-border)}.toc li a{display:block;padding:.25rem 0 .25rem .8rem;color:var(--color-text-mute)}.toc li a:hover{color:var(--color-accent);text-decoration:none}.toc li.depth-3 a{padding-left:1.6rem;font-size:.8rem}.breadcrumb{font-size:.82rem;color:var(--color-text-mute);margin-bottom:1.2rem}.breadcrumb a{color:var(--color-text-soft)}.breadcrumb .sep{margin:0 .45rem;color:var(--color-border)}.lede{font-size:1.05rem;background:var(--color-accent-soft);border-left:4px solid var(--color-accent);padding:1rem 1.2rem;border-radius:0 var(--radius) var(--radius) 0;margin:0 0 1.8rem;color:var(--color-text)}.article-meta{display:flex;flex-wrap:wrap;gap:.8rem;font-size:.82rem;color:var(--color-text-mute);margin-bottom:1.5rem}.article-meta .tag{background:var(--color-bg-soft);border:1px solid var(--color-border);border-radius:999px;padding:.1rem .6rem}.faq{margin:2.5rem 0}.faq details{border:1px solid var(--color-border);border-radius:var(--radius);margin-bottom:.6rem;background:var(--color-bg-soft)}.faq summary{cursor:pointer;padding:.9rem 1.1rem;font-weight:600;list-style:none}.faq summary::-webkit-details-marker{display:none}.faq summary:before{content:"＋";color:var(--color-accent);margin-right:.6rem;font-weight:700}.faq details[open] summary:before{content:"－"}.faq .faq-answer{padding:0 1.1rem 1rem 2.3rem;color:var(--color-text-soft)}.brand-cta{margin:2.5rem 0 1rem;padding:1.3rem 1.5rem;background:linear-gradient(135deg,var(--color-accent),var(--color-accent-dark));color:#fff;border-radius:var(--radius)}.brand-cta a{color:#fff;font-weight:600;text-decoration:underline}.brand-cta .arrow{white-space:nowrap}.hero{padding:3rem 1.5rem 2rem;text-align:center;max-width:760px;margin:0 auto}.hero h1{font-size:2.2rem}.hero p.tagline{font-size:1.1rem;color:var(--color-text-soft)}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem;margin:1.5rem 0}.card{border:1px solid var(--color-border);border-radius:var(--radius);padding:1.2rem;background:var(--color-bg);transition:box-shadow .15s,transform .15s}.card:hover{box-shadow:var(--shadow);transform:translateY(-2px)}.card h3{margin:0 0 .4rem;font-size:1.05rem}.card h3 a{color:var(--color-text)}.card .system{font-size:.78rem;color:var(--color-accent);font-weight:600}.card p{margin:.4rem 0 0;font-size:.9rem;color:var(--color-text-soft)}.overview-list{display:grid;grid-template-columns:1fr;gap:.5rem;margin:.8rem 0 1.5rem}.overview-item{display:grid;grid-template-columns:minmax(90px,auto) minmax(120px,auto) 1fr;align-items:baseline;gap:.3rem 1rem;padding:.7rem 1rem;border:1px solid var(--color-border);border-radius:var(--radius);background:var(--color-bg);color:var(--color-text);transition:box-shadow .15s,border-color .15s}.overview-item:hover{box-shadow:var(--shadow-sm);border-color:var(--color-accent);text-decoration:none}.overview-item .oi-country{font-weight:700;font-size:1rem}.overview-item .oi-system{font-size:.74rem;color:var(--color-accent-dark);font-weight:600;background:var(--color-accent-soft);border-radius:999px;padding:.1rem .55rem;justify-self:start;white-space:nowrap}.overview-item .oi-desc{font-size:.85rem;color:var(--color-text-soft)}@media(max-width:600px){.overview-item{grid-template-columns:1fr;gap:.25rem}}.callout{background:var(--color-callout-bg);border-left:4px solid var(--color-callout-border);padding:.9rem 1.1rem;border-radius:0 var(--radius) var(--radius) 0;margin:1.5rem 0;font-size:.95rem}.updates-feed{margin:1.5rem 0}.update-item{border-left:3px solid var(--color-accent);padding:.4rem 0 .4rem 1.1rem;margin-bottom:1.6rem}.update-item .u-date{font-size:.78rem;color:var(--color-text-mute);font-family:var(--font-mono)}.update-item .u-title{font-size:1.1rem;margin:.2rem 0 .4rem}.update-item .u-summary{margin:0 0 .5rem;color:var(--color-text-soft);font-size:.95rem}.update-item .u-meta{font-size:.85rem;display:flex;flex-wrap:wrap;gap:.3rem 1rem}.update-item .u-meta a{font-weight:600}.update-item .u-source{color:var(--color-text-mute)}.recent-guides{list-style:none;padding:0;margin:.5rem 0}.recent-guides li{display:flex;justify-content:space-between;align-items:baseline;gap:1rem;padding:.5rem 0;border-bottom:1px solid var(--color-border)}.recent-guides time{font-size:.78rem;color:var(--color-text-mute);font-family:var(--font-mono);white-space:nowrap}.home-updates{margin:1.5rem 0}.home-updates .hu-item{padding:.5rem 0;border-bottom:1px solid var(--color-border)}.home-updates .hu-date{font-size:.76rem;color:var(--color-text-mute);font-family:var(--font-mono);margin-right:.6rem}.home-updates .hu-item a{font-weight:600}.operator-note{margin-top:2.5rem;padding-top:1.2rem;border-top:1px solid var(--color-border);font-size:.88rem;color:var(--color-text-mute)}.operator-note a{color:var(--color-link)}.site-footer{border-top:1px solid var(--color-border);background:var(--color-bg-soft);margin-top:3rem;padding:2.5rem 1.5rem 2rem;font-size:.88rem;color:var(--color-text-soft)}.site-footer .footer-inner{max-width:1100px;margin:0 auto}.site-footer .network{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:.6rem 1.5rem;margin:1rem 0 1.5rem}.site-footer .network .net-title{grid-column:1 / -1;font-weight:600;color:var(--color-text);margin-bottom:.2rem}.site-footer .network a{color:var(--color-link);font-weight:600}.site-footer .network .desc{color:var(--color-text-mute);font-size:.82rem}.site-footer .legal{border-top:1px solid var(--color-border);padding-top:1rem;margin-top:1rem;color:var(--color-text-mute);font-size:.82rem}.site-footer .contact{font-weight:600;color:var(--color-text)}.site-footer .beian{font-size:.8rem;color:var(--color-text-mute);margin-top:.4rem}.site-footer .beian a{color:var(--color-text-mute)}.site-footer .beian a:hover{color:var(--color-link)}@media(max-width:1100px){.docs-layout{grid-template-columns:var(--sidebar-w) minmax(0,1fr)}.toc{display:none}}@media(max-width:768px){.docs-layout{grid-template-columns:1fr}.sidebar{position:fixed;top:var(--header-h);left:0;width:80%;max-width:300px;height:calc(100vh - var(--header-h));transform:translate(-100%);transition:transform .2s ease;z-index:40;box-shadow:var(--shadow)}.sidebar.open{transform:translate(0)}.nav-toggle{display:block}.site-header nav{display:none}.content{padding:1.5rem 1.1rem 3rem}h1{font-size:1.6rem}}