:root{--primary: #4F46E5;--primary-dark: #4338CA;--primary-light: #EEF2FF;--primary-border: #C7D2FE;--accent: #0EA5E9;--success: #059669;--success-light: #ECFDF5;--error: #DC2626;--error-light: #FEF2F2;--warning: #D97706;--warning-light: #FFFBEB;--bg: #F8FAFC;--surface: #FFFFFF;--surface-2: #F1F5F9;--surface-3: #E2E8F0;--text: #0F172A;--text-secondary: #475569;--text-muted: #94A3B8;--border: #E2E8F0;--border-strong: #CBD5E1;--radius-sm: 4px;--radius: 8px;--radius-lg: 12px;--radius-xl: 16px;--shadow-sm: 0 1px 2px rgba(15,23,42,.06);--shadow: 0 1px 3px rgba(15,23,42,.09), 0 1px 2px rgba(15,23,42,.05);--shadow-md: 0 4px 6px rgba(15,23,42,.08), 0 2px 4px rgba(15,23,42,.06);--shadow-lg: 0 12px 24px rgba(15,23,42,.14), 0 4px 8px rgba(15,23,42,.06);--gradient-brand: linear-gradient(135deg, #4F46E5 0%, #4338CA 55%, #3730A3 100%);--transition: .15s ease;--sidebar-width: 240px;--sidebar-collapsed-width: 64px;--header-height: 56px;--cat-json: #D97706;--cat-text: #7C3AED;--cat-encode: #E11D48;--cat-datetime: #0891B2;--cat-code: #059669;--cat-color: #EA580C}[data-theme=dark]{--bg: #0B1120;--surface: #161F32;--surface-2: #202B45;--surface-3: #2E3B59;--border: #263252;--border-strong: #3A4A70;--text: #F1F5F9;--text-secondary: #CBD5E1;--text-muted: #7280A3;--primary-light: #1E1B4B;--primary-border: #3730A3;--success-light: #052E23;--error-light: #450A0A;--warning-light: #451A03;--shadow-sm: 0 1px 2px rgba(0,0,0,.3);--shadow: 0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);--shadow-md: 0 4px 6px rgba(0,0,0,.35), 0 2px 4px rgba(0,0,0,.3);--shadow-lg: 0 12px 24px rgba(0,0,0,.45), 0 4px 8px rgba(0,0,0,.3)}.tool-page{max-width:1400px;margin:0 auto;padding:24px 20px}@media(max-width:768px){.tool-page{padding:16px 12px}}.tool-header{margin-bottom:24px}.tool-header h1{font-size:24px;font-weight:600;color:var(--text);margin:0 0 6px}.tool-header .tool-desc{font-size:14px;color:var(--text-secondary);margin:0}.tool-layout{display:grid;grid-template-columns:1fr auto 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textarea:read-only{background:var(--surface-2);cursor:default}@media(max-width:900px){.panel textarea{min-height:220px}}.action-bar{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;padding:0 12px;min-width:80px}@media(max-width:900px){.action-bar{flex-direction:row;padding:12px 0;min-width:unset}}.btn-icon,.btn-ghost,.btn-secondary,.btn-primary,.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 16px;border:1px solid transparent;border-radius:var(--radius);font-size:13px;font-weight:500;cursor:pointer;transition:all var(--transition);white-space:nowrap;text-decoration:none;line-height:1}.btn-icon:disabled,.btn-ghost:disabled,.btn-secondary:disabled,.btn-primary:disabled,.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--gradient-brand);color:#fff;border-color:var(--primary-dark);box-shadow:0 1px 2px #4338ca40}.btn-primary:hover:not(:disabled){filter:brightness(1.08);box-shadow:0 2px 6px #4338ca59}.btn-secondary{background:var(--surface-2);color:var(--text);border-color:var(--border)}.btn-secondary:hover:not(:disabled){background:var(--surface-3)}.btn-ghost{background:transparent;color:var(--text-secondary);padding:6px 10px}.btn-ghost:hover:not(:disabled){background:var(--surface-2);color:var(--text)}.btn-icon{background:transparent;color:var(--text-secondary);padding:6px;border-radius:var(--radius-sm)}.btn-icon:hover:not(:disabled){background:var(--surface-2);color:var(--text)}.form-group{display:flex;flex-direction:column;gap:6px}.form-group label{font-size:13px;font-weight:500;color:var(--text-secondary)}select,input[type=text],input[type=number]{padding:7px 10px;border:1px solid var(--border);border-radius:var(--radius);font-size:13px;color:var(--text);background:var(--surface);outline:none;transition:border-color var(--transition)}select:focus,input[type=text]:focus,input[type=number]:focus{border-color:var(--primary)}.alert{padding:10px 14px;border-radius:var(--radius);font-size:13px;margin-top:12px;display:flex;align-items:flex-start;gap:8px}.alert-error{background:var(--error-light);color:var(--error);border:1px solid #FCA5A5}.alert-success{background:var(--success-light);color:var(--success);border:1px solid #86EFAC}.alert-warning{background:var(--warning-light);color:var(--warning);border:1px solid #FCD34D}.stats-row{display:flex;flex-wrap:wrap;gap:12px;padding:10px 14px;background:var(--surface-2);border-top:1px solid var(--border)}.stats-row .stat{display:flex;flex-direction:column;gap:1px}.stats-row .stat .stat-val{font-size:15px;font-weight:600;color:var(--text)}.stats-row .stat .stat-label{font-size:11px;color:var(--text-muted)}.ad-container{margin:16px 0;min-height:90px;background:var(--surface-2);border-radius:var(--radius);overflow:hidden}*,*:before,*:after{box-sizing:border-box}html{font-size:16px;-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:14px;line-height:1.5;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}.app-shell{display:flex;flex-direction:column;min-height:100vh}.app-body{display:flex;flex:1;padding-top:var(--header-height)}.app-sidebar{width:var(--sidebar-width);flex-shrink:0;position:fixed;top:var(--header-height);left:0;height:calc(100vh - var(--header-height));overflow-y:auto;overflow-x:hidden;border-right:1px solid var(--border);background:var(--surface);z-index:100;transition:width var(--transition)}@media(max-width:1024px){.app-sidebar{transform:translate(-100%);transition:transform var(--transition)}.app-sidebar.open{transform:translate(0);box-shadow:var(--shadow-lg)}}.app-main{flex:1;margin-left:var(--sidebar-width);min-width:0;transition:margin-left var(--transition)}@media(max-width:1024px){.app-main{margin-left:0}}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:3px}h1,h2,h3,h4{margin:0;font-weight:600;line-height:1.3;color:var(--text)}p{margin:0}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}code{font-family:JetBrains Mono,Fira Code,monospace;font-size:.875em;background:var(--surface-2);padding:2px 5px;border-radius:var(--radius-sm)}