:root{--bg-main: #F7F9FC;--bg-card: #FFFFFF;--text-title: #0B172A;--text-body: #334155;--text-muted: #64748B;--primary: #2563EB;--primary-hover: #1D4ED8;--hero-bg: #101D36;--border: #E2E8F0;--border-light: #F1F5F9;--accent-light: #EFF6FF;--accent-green: #10B981;--accent-amber: #F59E0B;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .05);--shadow-md: 0 4px 12px rgba(15, 23, 42, .06);--shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, .08);--max-w: 1200px}html,body{overflow-x:hidden;width:100%}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background-color:var(--bg-main);color:var(--text-body);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}a{color:var(--primary);text-decoration:none;transition:color .15s ease}a:hover{color:var(--primary-hover)}.container{width:100%;max-width:var(--max-w);margin:0 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pre{background:#0f172a;color:#f8fafc;padding:16px;border-radius:var(--radius-sm);overflow-x:auto;max-width:100%;margin-bottom:20px;font-size:13px;line-height:1.5}.sidebar-sticky{position:sticky;top:90px}.toc-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius-md);padding:20px;margin-bottom:24px}.toc-title{font-size:14px;font-weight:700;color:var(--text-title);margin-bottom:12px;text-transform:uppercase;letter-spacing:.5px}.toc-list{list-style:none;font-size:13px;display:flex;flex-direction:column;gap:8px}.toc-list a{color:var(--text-muted);display:block}.toc-list a:hover{color:var(--primary)}.direct-answer-box{background:#f0fdf4;border:1px solid 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14px;border:1px solid var(--border);border-radius:var(--radius-sm);background:#f8fafc}@media(max-width:1024px){.desktop-nav{display:none}.mobile-menu-btn{display:block}}@media(max-width:900px){.hero-title{font-size:30px}.steps-container,.article-layout{grid-template-columns:1fr}.footer-top{grid-template-columns:1fr 1fr}}@media(max-width:600px){.hero-title{font-size:26px}.airport-grid,.footer-top{grid-template-columns:1fr}.footer-bottom{flex-direction:column;align-items:flex-start}}