.regex-lab-layout{--regex-bg:#ffffff;--regex-card-bg:#f8f9fa;--regex-card-border:#e1e4e8;--regex-accent:#0969da;--regex-accent-soft:rgba(9, 105, 218, 0.1);--regex-accent-strong:#0550ae;--regex-text-main:#24292f;--regex-text-muted:#57606a;--regex-danger:#d1242f;--regex-success:#1a7f37;--regex-radius-lg:8px;--regex-radius-xl:12px;--regex-shadow-soft:0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.08);--regex-border-subtle:1px solid #d0d7de;--regex-transition-fast:0.15s ease;--regex-font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;--regex-font-mono:ui-monospace, SFMono-Regular, "SF Mono", Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--regex-input-bg:#ffffff;--regex-input-border:#d0d7de;--regex-fieldset-bg:#f6f8fa}.regex-lab-layout *{box-sizing:border-box}.regex-lab-layout a{color:var(--regex-accent);text-decoration:none}.regex-lab-layout a:hover{text-decoration:underline;color:var(--regex-accent-strong)}.brand{display:flex;align-items:center;gap:.75rem}.brand-mark{width:34px;height:34px;border-radius:999px;background:radial-gradient(circle at 30% 10%,#38bdf8,#0f172a 55%,#020617);box-shadow:0 0 16px rgba(56,189,248,.8),0 0 40px rgba(250,204,21,.4);position:relative;overflow:hidden}.brand-mark::after{content:"";position:absolute;inset:4px;border-radius:inherit;border:1px solid rgba(226,232,240,.15)}.brand-text{display:flex;flex-direction:column}.brand-name{font-weight:700;letter-spacing:.06em;font-size:.95rem;text-transform:uppercase}.brand-tagline{font-size:.7rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.12em}.nav-links{display:flex;gap:1.25rem;font-size:.9rem}.nav-link{color:var(--text-muted);text-decoration:none;position:relative;padding-bottom:2px}.nav-link::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:linear-gradient(90deg,var(--accent),var(--accent-strong));transition:width var(--transition-fast);border-radius:999px}.nav-link:hover{color:var(--text-main)}.nav-link:hover::after{width:100%}main{flex:1}.hero{display:grid;grid-template-columns:minmax(0,1.5fr);gap:1.5rem;align-items:center;margin-bottom:1rem}.hero-title{font-size:clamp(1.9rem,2.35rem,2.6rem);line-height:1.1;letter-spacing:-.04em;margin:0 0 .75rem}.hero-title span.accent{background:linear-gradient(90deg,var(--accent),var(--accent-strong));-webkit-background-clip:text;color:transparent}.hero-subtitle{margin:0 0 1rem;color:var(--text-muted);font-size:.95rem;max-width:36rem}.hero-badges{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.1rem}.badge{padding:.2rem .6rem;border-radius:999px;font-size:.75rem;border:1px solid rgba(148,163,184,.4);background:radial-gradient(circle at top left,rgba(56,189,248,.18),transparent 55%);color:var(--text-muted)}.hero-cta{display:flex;flex-wrap:wrap;gap:.75rem;align-items:center;margin-bottom:.5rem}.btn-primary{border:none;cursor:pointer;padding:.6rem 1.1rem;border-radius:999px;font-size:.9rem;font-weight:600;background:radial-gradient(circle at top left,var(--accent-strong),var(--accent));color:#020617;box-shadow:0 0 20px rgba(56,189,248,.7),0 0 36px rgba(250,204,21,.35);display:inline-flex;align-items:center;gap:.5rem;transition:transform .12s ease-out,box-shadow .12s ease-out}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 0 28px rgba(56,189,248,.9),0 0 48px rgba(250,204,21,.5)}.btn-ghost{border-radius:999px;border:1px solid rgba(148,163,184,.4);padding:.5rem .9rem;font-size:.85rem;background:rgba(15,23,42,.7);color:var(--text-muted);display:inline-flex;align-items:center;gap:.4rem;cursor:pointer}.hero-meta{font-size:.75rem;color:var(--text-muted)}.ad-slot{border-radius:var(--radius-lg);margin:1.25rem 0;border:1px dashed rgba(148,163,184,.35);background:radial-gradient(circle at top,rgba(15,23,42,.8),rgba(2,6,23,.9));min-height:80px;display:flex;align-items:center;justify-content:center;font-size:.75rem;color:var(--text-muted)}.ad-slot span{opacity:.7}.regex-lab-layout{display:grid;grid-template-columns:minmax(0,1fr)minmax(0,1fr);gap:1rem;align-items:flex-start;margin-bottom:2rem;width:100%;max-width:100%}@media(max-width:900px){.regex-lab-layout{grid-template-columns:minmax(0,1fr)}}.regex-lab-card,.regex-lab-layout .tool-card{border-radius:var(--regex-radius-xl);border:var(--regex-border-subtle);background:var(--regex-card-bg);box-shadow:var(--regex-shadow-soft);padding:1.15rem 1rem 1.2rem;position:relative;overflow:hidden}.regex-lab-card-header,.regex-lab-layout .tool-card-header{display:flex;align-items:center;justify-content:space-between;gap:.75rem;margin-bottom:.75rem}.regex-lab-card-title,.regex-lab-layout .tool-card-header h3{font-size:1rem;font-weight:600;color:var(--regex-text-main)}.regex-lab-card-subtitle,.regex-lab-layout .tool-card-header small{font-size:.8rem;color:var(--regex-text-muted)}.regex-lab-pill{padding:.15rem .6rem;border-radius:999px;font-size:.7rem;border:1px solid var(--regex-input-border);background:var(--regex-accent-soft);color:var(--regex-accent);font-weight:500}.regex-lab-form-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:.75rem;position:relative;z-index:1}.regex-lab-fieldset{border-radius:var(--regex-radius-lg);border:1px solid var(--regex-input-border);padding:.6rem .6rem .7rem;background:var(--regex-fieldset-bg)}.regex-lab-fieldset legend{padding:0 .25rem;font-size:.75rem;text-transform:uppercase;letter-spacing:.08em;color:var(--regex-text-muted);font-weight:600}.regex-lab-field{display:flex;flex-direction:column;gap:.25rem;margin-bottom:.45rem}.regex-lab-field:last-child{margin-bottom:0}.regex-lab-field-row{display:flex;flex-wrap:wrap;gap:.4rem}.regex-lab-layout label{font-size:.75rem;color:var(--regex-text-main);font-weight:500}.regex-lab-layout input[type=text],.regex-lab-layout select,.regex-lab-layout textarea{width:100%;font-family:var(--regex-font-mono);font-size:.8rem;padding:.5rem .75rem;border-radius:6px;border:1px solid var(--regex-input-border);background:var(--regex-input-bg);color:var(--regex-text-main);outline:none;transition:border-color var(--regex-transition-fast),box-shadow var(--regex-transition-fast)}.regex-lab-layout input[type=text]:focus,.regex-lab-layout select:focus,.regex-lab-layout textarea:focus{border-color:var(--regex-accent);box-shadow:0 0 0 3px var(--regex-accent-soft);outline:none}.regex-lab-layout textarea{min-height:140px;resize:vertical;line-height:1.4}.regex-lab-checkbox-group{display:flex;flex-wrap:wrap;gap:.5rem;font-size:.8rem}.regex-lab-checkbox-item{display:flex;align-items:center;gap:.25rem;color:var(--regex-text-main)}.regex-lab-checkbox-item input[type=checkbox]{appearance:none;-webkit-appearance:none;width:16px;height:16px;border:2px solid var(--regex-input-border);border-radius:3px;background:var(--regex-input-bg);cursor:pointer;position:relative;vertical-align:middle;flex-shrink:0}.regex-lab-checkbox-item input[type=checkbox]:checked{background:var(--regex-accent);border-color:var(--regex-accent)}.regex-lab-checkbox-item input[type=checkbox]:checked::after{content:'✓';position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);color:#fff;font-size:11px;font-weight:700}.regex-lab-hint{font-size:.7rem;color:var(--regex-text-muted)}.regex-lab-hint strong{color:var(--regex-accent);font-weight:600}.regex-lab-section-label{font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;color:var(--regex-text-muted);margin-bottom:.35rem;font-weight:600}.regex-lab-pill-row{display:flex;flex-wrap:wrap;gap:.4rem}.regex-lab-pill-btn{border-radius:6px;border:1px solid var(--regex-input-border);padding:.4rem .75rem;font-size:.75rem;background:var(--regex-input-bg);color:var(--regex-text-main);cursor:pointer;font-weight:500;transition:all var(--regex-transition-fast)}.regex-lab-pill-btn:hover{background:var(--regex-accent);border-color:var(--regex-accent);color:#fff}.regex-lab-match-summary{font-size:.8rem;color:var(--regex-text-muted);margin-bottom:.35rem}.regex-lab-match-summary strong{color:var(--regex-accent);font-weight:600}.regex-lab-regex-error{font-size:.78rem;color:var(--regex-danger);margin-bottom:.4rem;font-weight:500}.regex-lab-highlight-preview{font-family:var(--regex-font-mono);font-size:.8rem;background:var(--regex-fieldset-bg);border-radius:6px;border:1px solid var(--regex-input-border);padding:.75rem;min-height:100px;line-height:1.5;white-space:pre-wrap;word-break:break-word;margin-bottom:.7rem;color:var(--regex-text-main)}.regex-lab-highlight-preview mark{background:var(--regex-accent-soft);color:var(--regex-accent-strong);border-radius:3px;padding:.1rem .2rem;font-weight:600;border:1px solid var(--regex-accent)}.regex-lab-groups-panel{margin-bottom:.7rem}.regex-lab-groups-container{font-size:.78rem;color:var(--regex-text-muted)}.groups-scroll{max-height:160px;overflow:auto;border-radius:6px;border:1px solid var(--regex-input-border);background:var(--regex-input-bg)}.groups-table{width:100%;border-collapse:collapse;font-size:.78rem}.groups-table th,.groups-table td{padding:.5rem .75rem;border-bottom:1px solid var(--regex-input-border);text-align:left;vertical-align:top;color:var(--regex-text-main)}.groups-table th{position:sticky;top:0;background:var(--regex-fieldset-bg);z-index:1;font-weight:600;font-size:.75rem;text-transform:uppercase;letter-spacing:.05em;color:var(--regex-text-muted)}.groups-table tr:last-child td{border-bottom:none}.groups-table tbody tr:nth-child(even){background:var(--regex-fieldset-bg)}.regex-lab-explanation-panel{border-radius:6px;border:1px solid var(--regex-input-border);background:var(--regex-fieldset-bg);padding:.75rem;max-height:280px;overflow:auto;margin-bottom:.7rem}.regex-lab-regex-summary{font-size:.8rem;color:var(--regex-text-muted);margin:.35rem 0 .4rem}.regex-lab-regex-summary strong{color:var(--regex-accent);font-weight:600}.regex-lab-explanation-list{list-style:none;margin:0;padding:0;font-size:.78rem}.regex-lab-explanation-list li{margin-bottom:.25rem;display:flex;gap:.4rem}.regex-lab-explanation-token{font-family:var(--regex-font-mono);font-size:.75rem;padding:.15rem .4rem;border-radius:4px;background:var(--regex-input-bg);border:1px solid var(--regex-input-border);white-space:nowrap;color:var(--regex-accent-strong);font-weight:600}.regex-lab-explanation-text{color:var(--regex-text-muted);line-height:1.5}.regex-lab-recipes{margin-top:.7rem;border-radius:6px;border:1px solid var(--regex-input-border);background:var(--regex-fieldset-bg);padding:.75rem}.regex-lab-recipes-title{font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;color:var(--regex-text-muted);margin-bottom:.5rem;font-weight:600}.regex-lab-recipes-grid{display:flex;flex-wrap:wrap;gap:.35rem}.recipe-btn{border-radius:6px;border:1px solid var(--regex-input-border);background:var(--regex-input-bg);color:var(--regex-text-main);font-size:.75rem;padding:.5rem .75rem;cursor:pointer;text-align:left;flex:1 1 calc(50% - .2rem);min-width:140px;font-weight:500;transition:all var(--regex-transition-fast)}.recipe-btn:hover{border-color:var(--regex-accent);background:var(--regex-accent-soft)}.recipe-btn span{display:block;font-size:.7rem;color:var(--regex-text-muted);margin-top:.15rem;font-weight:400}@media(max-width:600px){.recipe-btn{flex:1 1 100%}}.content-section{margin-bottom:2rem}.content-section h2{font-size:1.1rem;margin:0 0 .5rem}.content-section p{font-size:.9rem;color:var(--text-muted);max-width:56rem;line-height:1.6}.content-section ul{font-size:.9rem;color:var(--text-muted);line-height:1.6;padding-left:1.2rem}.faq-item{margin-bottom:.8rem}.faq-item h3{font-size:.95rem;margin:0 0 .25rem}.regex-lab-mt-small{margin-top:.35rem}