*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #0a0a12;
  --bg-card: #13131f;
  --bg-elevated: #1c1c30;
  --bg-hover: #262640;
  --border: #282845;
  --border-accent: #383860;
  --text: #eeeef5;
  --text-secondary: #9494b8;
  --text-muted: #606088;
  --accent: #2b6bff;
  --accent-hover: #6a4ae6;
  --accent-glow: rgba(124,92,252,.25);
  --accent-subtle: rgba(124,92,252,.12);
  --match-bg: rgba(251,191,36,.25);
  --match-border: rgba(251,191,36,.5);
  --group-bg: rgba(96,165,250,.2);
  --group-border: rgba(96,165,250,.4);
  --success: #34d399;
  --warning: #fbbf24;
  --danger: #f87171;
  --info: #60a5fa;
  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;
  --shadow: 0 8px 40px rgba(0,0,0,.5);
  --transition: .28s cubic-bezier(.4,0,.2,1);
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding: 20px;
  background-image: radial-gradient(ellipse at 30% 20%, rgba(124,92,252,.06) 0%, transparent 50%), radial-gradient(ellipse at 70% 80%, rgba(96,165,250,.04) 0%, transparent 50%);
}
::selection { background: var(--accent); color: #fff; }
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg-card); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

.app { max-width: 960px; margin: 0 auto; }

.header {
  text-align: center;
  margin-bottom: 32px;
  padding: 36px 20px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}
.header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 100%, var(--accent-glow) 0%, transparent 60%);
  pointer-events: none;
}
.header h1 {
  font-size: 32px;
  font-weight: 900;
  background: linear-gradient(135deg, var(--accent), #4d86ff, #f472b6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}
.header p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: 6px;
  position: relative;
}
.header .badges {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 14px;
  flex-wrap: wrap;
  position: relative;
}
.header .badge {
  font-size: 11px;
  padding: 4px 14px;
  border-radius: 20px;
  background: var(--accent-subtle);
  color: var(--accent);
  border: 1px solid rgba(124,92,252,.2);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
  transition: border-color var(--transition);
  box-shadow: var(--shadow);
}
.card:hover { border-color: var(--border-accent); }
.card-title {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
}

label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: .5px;
  display: block;
  margin-bottom: 6px;
}
input[type="text"], input[type="search"], textarea, select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--mono);
  font-size: 14px;
  transition: all var(--transition);
  outline: none;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
textarea { resize: vertical; min-height: 80px; line-height: 1.6; }
input.error { border-color: var(--danger); box-shadow: 0 0 0 3px rgba(248,113,113,.2); }
select { cursor: pointer; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 9px 18px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  background: var(--bg-hover);
  color: var(--text);
  border-color: var(--border-accent);
  transform: translateY(-1px);
}
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-group { display: flex; gap: 8px; flex-wrap: wrap; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #e06060; transform: translateY(-1px); }

.pattern-row {
  display: flex;
  gap: 12px;
  align-items: stretch;
}
.pattern-row .input-wrap {
  flex: 1;
  position: relative;
}
.pattern-row .input-wrap .slash {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono);
  font-size: 18px;
  color: var(--text-muted);
  pointer-events: none;
  font-weight: 300;
}
.pattern-row .input-wrap .slash.left { left: 12px; }
.pattern-row .input-wrap .slash.right { right: 12px; }
.pattern-row .input-wrap input {
  padding-left: 28px;
  padding-right: 28px;
  font-size: 16px;
  height: 100%;
}

.flags-row {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 10px;
}
.flag-btn {
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  text-transform: lowercase;
}
.flag-btn:hover { border-color: var(--border-accent); color: var(--text-secondary); }
.flag-btn.active {
  background: var(--accent-subtle);
  border-color: var(--accent);
  color: var(--accent);
}
.flag-btn .hint {
  font-family: var(--font);
  font-size: 10px;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 3px;
}

.text-preview {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 300px;
  overflow-y: auto;
  margin-top: 8px;
  min-height: 60px;
}
.text-preview .match-highlight {
  background: var(--match-bg);
  border-bottom: 2px solid var(--match-border);
  border-radius: 2px;
  padding: 0 1px;
  cursor: pointer;
  transition: background .15s;
}
.text-preview .match-highlight:hover { background: rgba(251,191,36,.4); }
.text-preview .match-highlight.group-1 { background: var(--group-bg); border-bottom-color: var(--group-border); }
.text-preview .match-highlight.group-2 { background: rgba(52,211,153,.2); border-bottom-color: rgba(52,211,153,.4); }
.text-preview .match-highlight.group-3 { background: rgba(248,113,113,.2); border-bottom-color: rgba(248,113,113,.4); }
.text-preview .match-highlight.group-4 { background: rgba(251,191,36,.2); border-bottom-color: rgba(251,191,36,.4); }

.replace-row {
  display: flex;
  gap: 12px;
  align-items: end;
  margin-top: 12px;
}
.replace-row .flex-col { flex: 1; }
.replace-output {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  margin-top: 8px;
  min-height: 44px;
}

.results-summary {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 16px;
  padding: 14px 18px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}
.results-summary .stat { text-align: center; flex: 1; min-width: 80px; }
.results-summary .stat .num {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent);
}
.results-summary .stat .label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: .5px;
  margin-top: 2px;
}

.match-item {
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
  transition: border-color var(--transition);
}
.match-item:hover { border-color: var(--border-accent); }
.match-item .match-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  font-size: 12px;
}
.match-item .match-header .match-index {
  color: var(--text-muted);
  font-weight: 600;
}
.match-item .match-header .match-pos {
  color: var(--text-muted);
  font-family: var(--mono);
  font-size: 11px;
}
.match-item .match-value {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--warning);
  word-break: break-all;
}
.match-item .match-groups {
  margin-top: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.match-item .match-groups .group-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 6px;
  font-family: var(--mono);
  font-size: 12px;
  background: var(--accent-subtle);
  color: var(--accent);
  border: 1px solid rgba(124,92,252,.2);
}
.match-item .match-groups .group-tag .gname {
  color: var(--text-muted);
  font-family: var(--font);
}

.cheat-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: all var(--transition);
  font-size: 13px;
}
.cheat-item:hover {
  border-color: var(--accent);
  background: var(--accent-subtle);
}
.cheat-item .cheat-pattern {
  font-family: var(--mono);
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
  min-width: 56px;
}
.cheat-item .cheat-desc {
  color: var(--text-secondary);
  font-size: 12px;
}
.cheat-item .cheat-example {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--text-muted);
  margin-left: auto;
  white-space: nowrap;
}

.example-chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.example-chip {
  padding: 5px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--bg);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.example-chip:hover {
  border-color: var(--accent);
  background: var(--accent-subtle);
  color: var(--accent);
}

.toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-elevated);
  border: 1px solid var(--border-accent);
  border-radius: 12px;
  padding: 13px 24px;
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow);
  opacity: 0;
  transition: all var(--transition);
  z-index: 999;
  pointer-events: none;
  white-space: nowrap;
}
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }

.tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px;
}
.tab {
  flex: 1;
  padding: 8px 14px;
  border: none;
  border-radius: var(--radius-xs);
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  text-align: center;
}
.tab:hover { color: var(--text-secondary); }
.tab.active {
  background: var(--accent);
  color: #fff;
}
.tab-content { display: none; }
.tab-content.active { display: block; }

@media (max-width: 600px) {
  .card { padding: 18px; }
  .header h1 { font-size: 24px; }
  .pattern-row { flex-direction: column; }
  .replace-row { flex-direction: column; }
  .results-summary { gap: 8px; }
  .results-summary .stat .num { font-size: 18px; }
}