*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--sidebar-width: 268px;--topbar-height: 60px;--color-red: #C8191A;--color-red-hover: #a51415;--color-red-light: #fdf1f1;--color-red-muted: rgba(200, 25, 26, .12);--color-bg: #f5f6f8;--color-surface: #ffffff;--color-border: #e2e5ea;--color-sidebar-bg: #f8f9fb;--color-sidebar-hover: #fee2e2;--color-sidebar-active-bg: #fde8e8;--color-sidebar-text: #374151;--color-sidebar-text-active: var(--color-red);--color-text: #1a1d23;--color-text-muted: #6b7280;--radius: 8px;--font: "Inter", system-ui, sans-serif}body{font-family:var(--font);background:var(--color-bg);color:var(--color-text);font-size:15px;line-height:1.6}.app-shell{display:flex;flex-direction:column;height:100vh;overflow:hidden}.app-body{display:flex;flex:1;overflow:hidden;position:relative}.topbar{height:var(--topbar-height);background:var(--color-surface);border-bottom:3px solid var(--color-red);display:flex;align-items:center;padding:0 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p{color:var(--color-text-muted)}.category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:14px}.category-card{background:var(--color-surface);border:1px solid var(--color-border);border-top:3px solid var(--color-red);border-radius:var(--radius);padding:20px 18px;text-decoration:none;color:var(--color-text);transition:box-shadow .15s,transform .15s;display:block}.category-card:hover{box-shadow:0 4px 16px #c8191a1f;transform:translateY(-2px)}.card-icon{font-size:26px;display:block;margin-bottom:10px}.category-card h3{font-size:14px;font-weight:600;margin-bottom:4px}.category-card p{font-size:12px;color:var(--color-text-muted)}.category-page h2{font-size:20px;margin-bottom:18px}.article-index{list-style:none;display:flex;flex-direction:column;gap:8px}.article-index-link{display:block;padding:14px 18px;background:var(--color-surface);border:1px solid var(--color-border);border-left:3px solid 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input[type=checkbox]{accent-color:var(--color-red);margin-right:6px;width:16px;height:16px;cursor:pointer}.article-meta{display:flex;align-items:center;justify-content:space-between;max-width:800px;margin-bottom:10px;gap:12px}.last-updated{font-size:12px;color:var(--color-text-muted)}.print-btn{background:none;border:1px solid var(--color-border);border-radius:var(--radius);padding:5px 12px;font-size:12px;color:var(--color-text-muted);cursor:pointer;transition:background .15s,color .15s}.print-btn:hover{background:var(--color-red-light);color:var(--color-red);border-color:var(--color-red)}.back-to-top{position:fixed;bottom:28px;right:28px;width:40px;height:40px;border-radius:50%;background:var(--color-red);color:#fff;border:none;font-size:18px;cursor:pointer;box-shadow:0 2px 10px #0003;transition:background .15s,transform .15s;z-index:100}.back-to-top:hover{background:var(--color-red-hover);transform:translateY(-2px)}.empty-state{background:var(--color-surface);border:1px dashed var(--color-border);border-radius:var(--radius);padding:40px;text-align:center;color:var(--color-text-muted)}.empty-state .hint{font-size:13px;margin-top:8px}@media print{.sidebar,.topbar,.breadcrumb,.sidebar-overlay,.no-print{display:none!important}.main-content{padding:0}.article-body{border:none;padding:0;max-width:100%}.article-body h1{color:#000}.article-body th{background:#444}.article-body input[type=checkbox]{accent-color:#000}}@media (max-width: 768px){.menu-toggle{display:flex}.sidebar{position:fixed;top:var(--topbar-height);left:0;bottom:0;z-index:150;transform:translate(-100%);width:min(var(--sidebar-width),85vw)}.sidebar--open{transform:translate(0)}.sidebar-overlay{display:block}.main-content{padding:20px 16px}.article-body{padding:20px 18px}.category-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}.topbar{padding:0 14px;gap:12px}.topbar-logo{height:36px}.search-wrapper{max-width:none}}@media (max-width: 480px){.category-grid{grid-template-columns:1fr 1fr}.home-hero h2{font-size:18px}}