:root{--bg:#0f172a;--surface:#1e293b;--surface2:#334155;--text:#f1f5f9;--text-muted:#94a3b8;--accent:#3b82f6;--accent-hover:#2563eb;--border:#475569;--success:#22c55e;--radius:10px;--shadow:0 4px 24px rgba(0,0,0,.3)}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}.skip-link{position:absolute;top:-40px;left:0;background:var(--accent);color:#fff;padding:8px 16px;z-index:100;border-radius:0 0 6px;text-decoration:none;font-weight:600;font-size:14px}.skip-link:focus{top:0}.container{max-width:1100px;margin:0 auto;padding:0 20px}.site-header{background:var(--surface);border-bottom:1px solid var(--border);padding:14px 0;position:sticky;top:0;z-index:50}.site-header .container{display:flex;align-items:center;justify-content:space-between}.site-logo{font-weight:700;font-size:18px;color:var(--accent);text-decoration:none}.site-nav{display:flex;gap:20px}.site-nav a{color:var(--text-muted);text-decoration:none;font-size:14px;font-weight:500;transition:color .2s}.site-nav a:hover{color:var(--text)}.hero{text-align:center;padding:40px 0 20px}.hero h1{font-size:2rem;margin:0 0 12px;background:linear-gradient(135deg,#60a5fa,#a78bfa);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.lead{color:var(--text-muted);font-size:1.05rem;max-width:680px;margin:0 auto;line-height:1.7}.tool-section{margin:30px 0}.controls-panel{background:var(--surface);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);margin-bottom:24px}.presets-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}.preset-btn{padding:6px 14px;background:var(--surface2);border:1px solid var(--border);border-radius:6px;color:var(--text-muted);font-size:12px;cursor:pointer;font-weight:500;transition:all .2s;font-family:JetBrains Mono,monospace}.preset-btn:hover,.preset-btn.active{background:var(--accent);border-color:var(--accent);color:#fff}.regex-input-row{display:flex;align-items:center;gap:12px;margin-bottom:12px}.regex-input-row label{font-size:12px;font-weight:600;color:var(--text-muted);white-space:nowrap;text-transform:uppercase}.regex-input-row input[type=text]{flex:1;background:#0d1117;border:2px solid var(--border);border-radius:8px;padding:10px 14px;color:#e6edf3;font-family:JetBrains Mono,monospace;font-size:16px;font-weight:600;letter-spacing:.5px;outline:none;transition:border-color .2s}.regex-input-row input[type=text]:focus{border-color:var(--accent)}.regex-input-row input[type=text].error{border-color:#ef4444}.flags-row{display:flex;gap:6px;margin-bottom:12px;align-items:center}.flag-btn{padding:6px 14px;background:var(--surface2);border:1px solid var(--border);border-radius:6px;color:var(--text-muted);font-size:13px;cursor:pointer;font-weight:600;font-family:JetBrains Mono,monospace;transition:all .2s}.flag-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}.flag-label{font-size:12px;color:var(--text-muted);margin-right:4px}.explain-box{background:#0d1117;border:1px solid #30363d;border-radius:8px;padding:12px 16px;margin-bottom:16px;font-size:14px;color:#e6edf3;min-height:40px;line-height:1.6}.explain-box .muted{color:var(--text-muted);font-size:13px}.cheat-section{margin-bottom:16px}.cheat-section h3{font-size:12px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.3px;margin:0 0 8px}.cheat-tokens{display:flex;flex-wrap:wrap;gap:4px}.token-btn{padding:4px 10px;background:var(--surface2);border:1px solid var(--border);border-radius:4px;color:var(--text);font-size:12px;cursor:pointer;font-family:JetBrains Mono,monospace;transition:all .15s;line-height:1.5}.token-btn:hover{background:var(--accent);color:#fff;border-color:var(--accent)}.token-btn .desc{font-family:system-ui,sans-serif;font-size:10px;color:var(--text-muted);display:block}.test-area{width:100%;min-height:120px;background:#0d1117;border:1px solid #30363d;border-radius:8px;padding:12px 14px;color:#e6edf3;font-family:JetBrains Mono,monospace;font-size:13px;line-height:1.6;outline:none;resize:vertical;transition:border-color .2s}.test-area:focus{border-color:var(--accent)}.test-output{background:var(--surface2);border:1px solid var(--border);border-radius:8px;padding:12px 14px;margin-top:12px;font-family:JetBrains Mono,monospace;font-size:13px;line-height:1.7;white-space:pre-wrap;word-break:break-all;word-wrap:break-word;min-height:60px;max-height:200px;overflow-y:auto}.test-output mark{background:#22c55e;color:#0f172a;padding:1px 0;border-radius:2px;font-weight:600}.match-stats{font-size:12px;color:var(--text-muted);margin-top:8px}.export-bar{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}.btn{display:inline-flex;align-items:center;gap:6px;padding:10px 20px;border:none;border-radius:8px;font-size:14px;font-weight:600;cursor:pointer;transition:all .2s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px)}.btn-outline{background:transparent;color:var(--text);border:1px solid var(--border)}.btn-outline:hover{background:var(--surface2);border-color:var(--text-muted)}.copy-feedback{font-size:13px;color:var(--success);opacity:0;transition:opacity .3s;align-self:center}.copy-feedback.show{opacity:1}.content-section{padding:32px 0;border-top:1px solid var(--border)}.content-section h2{font-size:1.5rem;margin:0 0 20px;color:var(--text)}.content-section p,.content-section li{color:var(--text-muted);line-height:1.7}.content-section code{background:var(--surface2);padding:1px 5px;border-radius:4px;font-size:13px;font-family:JetBrains Mono,monospace}.steps{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px;padding:0;list-style:none}.steps li{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px;font-size:14px}.steps li strong{display:block;color:var(--text);margin-bottom:4px}.faq-item{margin-bottom:20px}.faq-item h3{font-size:1rem;margin:0 0 6px;color:var(--text)}.faq-item p{margin:0;color:var(--text-muted);font-size:14px}.rec-links{display:flex;flex-wrap:wrap;gap:10px}.rec-pill{display:inline-block;padding:8px 16px;background:var(--surface);border:1px solid var(--border);border-radius:20px;color:var(--text);text-decoration:none;font-size:13px;font-weight:500;transition:all .2s}.rec-pill:hover{background:var(--accent);color:#fff;border-color:var(--accent)}.site-footer{border-top:1px solid var(--border);padding:24px 0;text-align:center}.site-footer p{margin:0;font-size:13px;color:var(--text-muted)}.site-footer a{color:var(--accent);text-decoration:none}@media (max-width:768px){.hero h1{font-size:1.5rem}.steps{grid-template-columns:1fr}.export-bar{flex-direction:column}.btn{justify-content:center}}