:root{--bg: #f4f5f7;--card-bg: #ffffff;--text: #111827;--muted: #6b7280;--border: #e5e7eb;--accent: #1a56db;--accent-dark: #0f172a;--danger: #dc2626;--success: #15803d}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Segoe UI,-apple-system,BlinkMacSystemFont,Arial,sans-serif}.app-header{background:var(--accent-dark);color:#fff;padding:20px 32px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.app-header h1{font-size:20px;margin:0}.app-header nav{display:flex;gap:8px}.app-header nav button{background:transparent;border:1px solid rgba(255,255,255,.3);color:#fff;padding:8px 16px;border-radius:6px;cursor:pointer;font-size:14px}.app-header nav button.active{background:var(--accent);border-color:var(--accent)}main{max-width:1200px;margin:0 auto;padding:24px 16px 48px}.categories-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:16px}.category-card{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;padding:18px 20px}.category-header{display:flex;justify-content:space-between;align-items:flex-start;gap:8px}.category-header h2{font-size:16px;margin:0 0 4px}.category-description{font-size:13px;color:var(--muted);margin:0}.category-count{font-size:12px;color:var(--muted);white-space:nowrap}.category-actions{display:flex;gap:8px;margin:14px 0;flex-wrap:wrap}.category-actions button,.settings-actions button{border:1px solid var(--border);background:var(--bg);border-radius:6px;padding:6px 12px;font-size:13px;cursor:pointer}.category-actions button:hover,.settings-actions button:hover{background:#e9ebef}.source-list{display:flex;flex-direction:column;gap:6px}.source-row{display:flex;align-items:center;gap:10px;padding:6px 4px;border-radius:6px;cursor:pointer}.source-row:hover{background:var(--bg)}.source-name{flex:1;font-size:14px;display:flex;align-items:center;gap:6px}.source-name a{color:var(--text);text-decoration:none}.source-name a:hover{color:var(--accent)}.badge{font-size:11px;padding:1px 6px;border-radius:10px;background:#e0e7ff;color:#3730a3}.badge-error{background:#fee2e2;color:var(--danger)}.icon-button{border:none;background:transparent;color:var(--muted);cursor:pointer;font-size:14px}.icon-button:hover{color:var(--danger)}.add-source-form{margin-top:14px;display:flex;flex-direction:column;gap:8px;border-top:1px solid var(--border);padding-top:14px}.add-source-form input{padding:8px 10px;border:1px solid var(--border);border-radius:6px;font-size:14px}.add-source-form button{align-self:flex-start;background:var(--accent);color:#fff;border:none;border-radius:6px;padding:8px 16px;cursor:pointer}.settings-card{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;padding:24px;max-width:480px}.settings-card form{display:flex;flex-direction:column;gap:16px;margin-top:16px}.settings-card label{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:600}.settings-card input[type=text],.settings-card input[type=time]{font-weight:400;padding:8px 10px;border:1px solid var(--border);border-radius:6px;font-size:14px}.checkbox-label{flex-direction:row!important;align-items:center}.settings-actions{display:flex;gap:10px}.settings-actions button[type=submit]{background:var(--accent);color:#fff;border-color:var(--accent)}.form-error{color:var(--danger);font-size:13px}.form-success{color:var(--success);font-size:13px}.home-layout{display:grid;grid-template-columns:220px 1fr;gap:24px;align-items:start}.category-nav{display:flex;flex-direction:column;gap:4px;position:sticky;top:24px}.category-nav button{text-align:left;border:none;background:transparent;padding:9px 12px;border-radius:6px;font-size:14px;cursor:pointer;color:var(--text)}.category-nav button:hover{background:#e9ebef}.category-nav button.active{background:var(--accent);color:#fff}.article-feed{display:flex;flex-direction:column;gap:12px;min-width:0}.article-card{background:var(--card-bg);border:1px solid var(--border);border-radius:10px;padding:16px 20px}.article-title{font-size:16px;font-weight:600;color:var(--text);text-decoration:none}.article-title:hover{color:var(--accent)}.article-meta{font-size:13px;color:var(--muted);margin-top:4px}.article-summary{font-size:14px;color:#374151;margin:10px 0 0}.empty-hint{color:var(--muted);font-size:14px;background:var(--card-bg);border:1px dashed var(--border);border-radius:10px;padding:20px}@media (max-width: 720px){.home-layout{grid-template-columns:1fr}.category-nav{position:static;flex-direction:row;flex-wrap:wrap}}.subnav{display:flex;gap:8px;margin-bottom:20px}.subnav button{border:1px solid var(--border);background:var(--card-bg);padding:8px 16px;border-radius:6px;font-size:14px;cursor:pointer}.subnav button.active{background:var(--accent);color:#fff;border-color:var(--accent)}