:root {
  --primary: #EF4444;
  --primary-dim: rgba(239,68,68,0.12);
  --secondary: #F87171;
  --accent: #22D3EE;
  --accent-dim: rgba(34,211,238,0.12);
  --bg: #0F1219;
  --bg-input: rgba(8,10,16,0.9);
  --border: rgba(239,68,68,0.1);
  --border-hover: rgba(239,68,68,0.2);
  --text: #E2E8F0;
  --text-dim: #94A3B8;
  --text-muted: #64748B;
  --radius: 12px;
  --radius-sm: 8px;
  --font: 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', monospace;
  --transition: 250ms ease;
  --glass: rgba(15,18,25,0.65);
  --glass-border: rgba(239,68,68,0.08);
  --success: #10B981;
  --warning: #F59E0B;
  --match-bg: rgba(239,68,68,0.2);
  --group1: #EF4444;
  --group2: #22D3EE;
  --group3: #A78BFA;
  --group4: #F59E0B;
  --group5: #10B981;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font); background: var(--bg); color: var(--text);
  min-height: 100vh; line-height: 1.6;
  background-image:
    radial-gradient(ellipse at 20% 10%, rgba(239,68,68,0.04) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 90%, rgba(34,211,238,0.03) 0%, transparent 50%);
}
.app { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; flex-direction: column; min-height: 100vh; }

.header { padding: 16px 0; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.header-left { display: flex; align-items: center; gap: 12px; }
.logo { width: 40px; height: 40px; display: flex; align-items: center; justify-content: center; }
.header h1 { font-size: 1.2rem; font-weight: 700; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.header-right { display: flex; gap: 6px; }

.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border-radius: var(--radius-sm); border: none; font-family: var(--font); font-size: 0.85rem; font-weight: 600; cursor: pointer; transition: all var(--transition); white-space: nowrap; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: #DC2626; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); background: var(--primary-dim); }
.btn-ghost:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-sm { padding: 6px 12px; font-size: 0.78rem; }

.main { flex: 1; display: grid; grid-template-columns: 380px 1fr; gap: 16px; padding: 16px 0; align-items: start; }

.panel { background: var(--glass); backdrop-filter: blur(12px); border: 1px solid var(--glass-border); border-radius: var(--radius); display: flex; flex-direction: column; overflow: hidden; animation: fadeIn 0.3s ease; }
.panel-header { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--border); }
.panel-header h2 { font-size: 0.88rem; font-weight: 600; }
.panel-body { padding: 16px; flex: 1; }

.input { width: 100%; padding: 8px 12px; background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text); font-family: var(--font); font-size: 0.82rem; outline: none; transition: all var(--transition); }
.input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-dim); }
.divider { border: none; border-top: 1px solid var(--border); margin: 14px 0; }
.section-title { font-size: 0.78rem; font-weight: 600; color: var(--text-dim); margin-bottom: 8px; }
.empty-msg { font-size: 0.78rem; color: var(--text-muted); }

/* Regex Input */
.regex-input-row { display: flex; align-items: center; gap: 4px; }
.regex-slash { font-family: var(--mono); font-size: 1.2rem; color: var(--primary); font-weight: 700; }
.regex-field { flex: 1; font-family: var(--mono); font-size: 0.88rem; }
.flags-row { display: flex; gap: 3px; }
.flag-btn { padding: 4px 8px; font-family: var(--mono); font-size: 0.78rem; font-weight: 600; border: 1px solid var(--border); border-radius: 4px; background: transparent; color: var(--text-muted); cursor: pointer; transition: all var(--transition); }
.flag-btn.active { background: var(--primary-dim); color: var(--primary); border-color: var(--primary); }
.flag-btn:hover { color: var(--text); }
.test-textarea { min-height: 80px; font-family: var(--mono); resize: vertical; }
.actions-row { display: flex; gap: 8px; margin-top: 12px; }
.error-msg { margin-top: 8px; padding: 8px 12px; background: rgba(239,68,68,0.1); border: 1px solid rgba(239,68,68,0.2); border-radius: var(--radius-sm); color: var(--primary); font-size: 0.78rem; }

/* Match Count */
.match-count { font-size: 0.78rem; font-weight: 600; color: var(--accent); padding: 3px 10px; background: var(--accent-dim); border-radius: 12px; }

/* Match Visual */
.match-visual { background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px; font-family: var(--mono); font-size: 0.82rem; line-height: 2; white-space: pre-wrap; word-break: break-all; }
.match-visual .match { background: var(--match-bg); border-bottom: 2px solid var(--primary); padding: 1px 0; }
.match-visual .group { padding: 1px 0; border-radius: 2px; }
.match-visual .group-1 { background: rgba(239,68,68,0.15); border-bottom: 2px solid var(--group1); }
.match-visual .group-2 { background: rgba(34,211,238,0.15); border-bottom: 2px solid var(--group2); }
.match-visual .group-3 { background: rgba(167,139,250,0.15); border-bottom: 2px solid var(--group3); }
.match-visual .group-4 { background: rgba(245,158,11,0.15); border-bottom: 2px solid var(--group4); }
.match-visual .group-5 { background: rgba(16,185,129,0.15); border-bottom: 2px solid var(--group5); }

/* Capture Groups */
.capture-groups { display: flex; flex-direction: column; gap: 6px; }
.group-item { padding: 8px 10px; background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 0.78rem; display: flex; align-items: center; gap: 8px; }
.group-label { font-weight: 600; min-width: 70px; }
.group-value { font-family: var(--mono); color: var(--text); }
.group-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }

/* Performance */
.perf-info { display: flex; align-items: center; gap: 10px; }
.perf-badge { padding: 4px 12px; border-radius: 12px; font-size: 0.78rem; font-weight: 600; }
.perf-badge.fast { background: rgba(16,185,129,0.1); color: var(--success); border: 1px solid rgba(16,185,129,0.2); }
.perf-badge.slow { background: rgba(245,158,11,0.1); color: var(--warning); border: 1px solid rgba(245,158,11,0.2); }
.perf-badge.danger { background: rgba(239,68,68,0.1); color: var(--primary); border: 1px solid rgba(239,68,68,0.2); }
.perf-time { font-size: 0.78rem; color: var(--text-dim); font-family: var(--mono); }

/* Matches Table */
.matches-table { display: flex; flex-direction: column; gap: 4px; max-height: 300px; overflow-y: auto; }
.match-row { padding: 6px 10px; background: var(--bg-input); border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 0.78rem; display: flex; gap: 10px; }
.match-idx { font-weight: 600; color: var(--primary); min-width: 30px; }
.match-text { font-family: var(--mono); color: var(--text); flex: 1; }
.match-pos { color: var(--text-muted); font-family: var(--mono); }

/* Modal */
.modal-overlay { position: fixed; inset: 0; background: rgba(15,18,25,0.9); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal-overlay.hidden { display: none; }
.modal { background: var(--glass); backdrop-filter: blur(16px); border: 1px solid var(--glass-border); border-radius: var(--radius); width: 500px; max-width: 90vw; max-height: 80vh; display: flex; flex-direction: column; animation: fadeIn 0.3s ease; }
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--border); }
.modal-body { padding: 16px; overflow-y: auto; flex: 1; }
.pattern-item { padding: 10px; border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 6px; cursor: pointer; transition: all var(--transition); }
.pattern-item:hover { border-color: var(--primary); background: var(--primary-dim); }
.pattern-name { font-weight: 600; font-size: 0.82rem; }
.pattern-regex { font-family: var(--mono); font-size: 0.72rem; color: var(--accent); margin-top: 2px; }

.footer { padding: 16px 0; text-align: center; font-size: 0.72rem; color: var(--text-muted); border-top: 1px solid var(--border); margin-top: auto; }

.hidden { display: none !important; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-hover); border-radius: 3px; }
@media (max-width: 800px) { .main { grid-template-columns: 1fr; } }