:root{--bg: #f7f7fb;--surface: #ffffff;--text: #1d1d1f;--text-muted: #6b7280;--border: #ececf1;--primary: #6366f1;--primary-soft: #eef0ff;--shadow: 0 1px 2px rgba(15, 15, 25, .04), 0 4px 14px rgba(15, 15, 25, .04);--radius: 14px;--radius-sm: 10px;--sidebar-width: 240px;font-family:-apple-system,BlinkMacSystemFont,Helvetica Neue,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif}[data-theme=dark]{--bg: #0f1115;--surface: #171a21;--text: #f4f4f5;--text-muted: #9ca3af;--border: #262a33;--primary: #818cf8;--primary-soft: #1f2230;--shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 4px 14px rgba(0, 0, 0, .3)}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}.app{display:grid;grid-template-columns:var(--sidebar-width) 1fr;min-height:100vh}.sidebar{background:var(--surface);border-right:1px solid var(--border);padding:22px 14px;position:sticky;top:0;height:100vh;overflow-y:auto}.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:18px;margin:4px 8px 22px}.brand-dot{width:10px;height:10px;border-radius:50%;background:var(--primary)}.nav-section-title{font-size:12px;color:var(--text-muted);margin:16px 10px 8px;letter-spacing:.04em}.nav-link{display:flex;align-items:center;gap:10px;padding:8px 10px;border-radius:10px;font-size:14px;color:var(--text);transition:background .15s ease}.nav-link:hover{background:var(--primary-soft)}.nav-link.active{background:var(--primary);color:#fff}.nav-link .ic{width:20px;text-align:center;font-size:14px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:18px 28px;border-bottom:1px solid var(--border);background:var(--surface)}.topbar-inner{width:100%;max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:16px}.topbar-title{font-size:18px;font-weight:600}.topbar-right{display:flex;gap:8px}.chip{display:inline-flex;align-items:center;gap:6px;height:32px;padding:0 12px;font-size:13px;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--text);cursor:pointer;text-decoration:none}.chip:hover{background:var(--primary-soft)}.chip-active{background:var(--primary-soft);border-color:var(--primary);color:var(--primary)}.content{padding:28px;max-width:1200px;margin:0 auto}@media(min-width:1600px){:root{--sidebar-width: 280px}.content,.topbar-inner{max-width:1320px}}.search-wrap{display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:10px 14px;margin-bottom:18px;box-shadow:var(--shadow)}.search-wrap input{border:none;outline:none;background:transparent;flex:1;font-size:14px;color:var(--text)}.cat-tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}.cat-tab{padding:6px 14px;border-radius:999px;border:1px solid var(--border);background:var(--surface);font-size:13px;color:var(--text);cursor:pointer}.cat-tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}.section-title{font-size:13px;color:var(--text-muted);margin:24px 4px 12px}.tool-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}.tool-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow);transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}.tool-card:hover{transform:translateY(-2px);border-color:var(--primary)}.tool-icon{width:38px;height:38px;border-radius:10px;background:var(--primary-soft);color:var(--primary);display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;margin-bottom:10px}.tool-name{font-weight:600;font-size:15px;display:flex;align-items:center;gap:6px;margin-bottom:4px}.tool-desc{font-size:13px;color:var(--text-muted);line-height:1.5}.badge-new{display:inline-block;padding:1px 8px;border-radius:999px;background:#e8f8ee;color:#1f9d55;font-size:11px;font-weight:500}[data-theme=dark] .badge-new{background:#14321f;color:#4ade80}.page-header{margin-bottom:18px}.page-header h1{font-size:24px;margin:0 0 6px}.page-header p{margin:0;color:var(--text-muted);font-size:14px}.crumbs{font-size:13px;color:var(--text-muted);margin-bottom:8px}.crumbs a:hover{color:var(--primary)}.tool-surface{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.tool-guide{margin-top:32px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px 28px;box-shadow:var(--shadow);line-height:1.75;font-size:14.5px}.tool-guide h2{font-size:18px;margin:24px 0 10px;display:flex;align-items:center;gap:8px}.tool-guide h2:first-child{margin-top:0}.tool-guide h2:before{content:"";width:4px;height:16px;background:var(--primary);border-radius:2px}.tool-guide p{margin:0 0 12px;color:var(--text)}.tool-guide ol,.tool-guide ul{margin:0 0 12px;padding-left:22px}.tool-guide li{margin-bottom:6px}.tool-guide .faq-item{border-top:1px solid var(--border);padding:14px 0}.tool-guide .faq-item:last-child{padding-bottom:0}.tool-guide .faq-q{font-weight:600;margin-bottom:6px}.tool-guide .faq-a{color:var(--text-muted);margin:0}@media(max-width:768px){.app{grid-template-columns:1fr}.sidebar{position:relative;height:auto;border-right:none;border-bottom:1px solid var(--border)}}