:root{--bg:#f6f7fb;--card:#fff;--text:#17181c;--muted:#6b7280;--primary:#4f6ef7;--primary-2:#7c3aed;--border:#e8eaf1;--radius:14px;--shadow:0 1px 3px rgba(23,24,28,.05);--shadow-lg:0 12px 32px rgba(79,110,247,.12)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased}.container{max-width:1080px;margin:0 auto;padding:0 20px}.site-header{background:hsla(0,0%,100%,.85);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);position:-webkit-sticky;position:sticky;top:0;z-index:10}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;height:60px}.logo{font-weight:800;font-size:18px;color:var(--text);text-decoration:none;background:linear-gradient(135deg,var(--primary),var(--primary-2));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;flex-shrink:0;white-space:nowrap}.nav{display:flex;gap:4px;overflow-x:auto;min-width:0;justify-content:flex-end;-webkit-overflow-scrolling:touch;scrollbar-width:none}.nav::-webkit-scrollbar{display:none}.nav a{color:var(--muted);text-decoration:none;font-size:13.5px;white-space:nowrap;padding:6px 10px;border-radius:8px;transition:all .15s}.nav a:hover{color:var(--primary);background:rgba(79,110,247,.07)}.hero{text-align:center;padding:64px 0 32px;background:radial-gradient(600px 300px at 20% 0,rgba(79,110,247,.09),transparent),radial-gradient(600px 300px at 80% 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16px;font-size:13.5px;color:var(--muted);cursor:pointer;transition:all .15s;display:inline-flex;align-items:center;gap:6px}.cat-tab:hover{border-color:var(--primary);color:var(--primary)}.cat-tab.active{background:linear-gradient(135deg,var(--primary),var(--primary-2));border-color:transparent;color:#fff}.cat-count{font-size:11px;opacity:.65}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));grid-gap:14px;gap:14px}.tool-card{display:flex;flex-direction:column;gap:6px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:18px;text-decoration:none;color:var(--text);box-shadow:var(--shadow);transition:all .18s ease;position:relative}.fav-btn{position:absolute;top:10px;right:10px;background:transparent;border:none;color:#d1d5db;font-size:16px;padding:4px;cursor:pointer;line-height:1;transition:color .15s,transform .15s}.fav-btn:hover{color:#f59e0b;transform:scale(1.2);opacity:1}.fav-btn.faved{color:#f59e0b}.features{padding:24px 0 8px}.features h2,.seo-text h2{text-align:center;font-size:26px;margin:0 0 24px;letter-spacing:-.3px}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));grid-gap:14px;gap:14px}.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:all .18s ease}.feature-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}.feature-icon{font-size:28px;margin-bottom:10px}.feature-card h3{margin:0 0 6px;font-size:16px}.feature-card p{margin:0;font-size:13.5px;color:var(--muted)}.seo-text{padding:40px 0 8px}.seo-text p{color:var(--muted);font-size:14px;line-height:1.9;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px 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.k{font-size:12px;color:var(--muted)}.kv-item .v{font-family:ui-monospace,Consolas,monospace;font-size:14px;word-break:break-all}.md-preview{border:1px solid var(--border);border-radius:10px;padding:16px;min-height:180px;background:var(--bg)}.split{display:grid;grid-template-columns:1fr 1fr;grid-gap:16px;gap:16px}@media (max-width:720px){.split{grid-template-columns:1fr}.hero h1{font-size:30px}.header-inner{flex-wrap:wrap;height:auto;padding:10px 0 6px;row-gap:2px}.logo{width:100%;text-align:center;font-size:17px}.nav{width:100%;justify-content:flex-start}}.qr-result{text-align:center;padding:12px}.qr-result img{border:1px solid var(--border);border-radius:10px;background:#fff;padding:8px}.faq-section{margin-top:40px}.faq-section h2{font-size:20px}.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:14px 18px;margin-bottom:10px;box-shadow:var(--shadow)}.faq-item h3{margin:0 0 4px;font-size:15px}.faq-item 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.15s}.footer-grid a:hover{color:var(--primary)}.footer-bottom{border-top:1px solid var(--border);padding:16px 0;text-align:center;font-size:12.5px}.card-icon{font-size:30px;line-height:1;margin-bottom:10px}.chip-icon{margin-right:4px}.search-hub{margin:40px 0}.search-hub h2{font-size:20px;margin-bottom:14px}.search-hub-box{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}.engine-tabs{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px}.engine-tab{background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:6px 12px;font-size:13px;cursor:pointer}.engine-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}.search-hub-row{display:flex;gap:10px}.search-hub-row input{flex:1 1}.search-hub-row 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