/* AI Text Tools - Developer Dark Theme */
:root {
  --bg-primary: #0f1419;
  --bg-secondary: #1a1f2e;
  --bg-tertiary: #242b3d;
  --bg-input: #0f1419;
  --border: #2d3548;
  --border-focus: #58a6ff;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #484f58;
  --accent-green: #3fb950;
  --accent-cyan: #58a6ff;
  --accent-orange: #d29922;
  --accent-red: #f85149;
  --accent-purple: #bc8cff;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', 'Cascadia Code', Consolas, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.4);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent-cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Header */
.site-header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  background: rgba(26, 31, 46, 0.92);
}

.site-header .logo {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-green);
  white-space: nowrap;
}

.site-header .logo span { color: var(--text-secondary); }

.site-header nav {
  display: flex;
  gap: 0.25rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.site-header nav a {
  color: var(--text-secondary);
  padding: 0.4rem 0.75rem;
  font-size: 0.88rem;
  transition: all 0.2s;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  margin-left: 0;
}
.site-header nav a:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
  text-decoration: none;
}

/* Container */
.container { max-width: 1200px; margin: 0 auto; padding: 2rem; }
.container-wide { max-width: 1400px; margin: 0 auto; padding: 2rem; }

/* Tool Page Layout */
.tool-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.tool-header h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}
.tool-header p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Split Pane */
.split-pane {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  height: calc(100vh - 220px);
  min-height: 400px;
}

.pane {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.pane-header {
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.pane-body {
  flex: 1;
  overflow: auto;
  padding: 1rem;
}

/* Textarea */
textarea, .code-input {
  width: 100%;
  height: 100%;
  background: var(--bg-input);
  color: var(--text-primary);
  border: none;
  outline: none;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.7;
  resize: none;
  padding: 0;
  tab-size: 2;
}

textarea::placeholder { color: var(--text-muted); }

/* Input */
input[type="text"], input[type="number"], select {
  background: var(--bg-input);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
input[type="text"]:focus, input[type="number"]:focus, select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.15);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.btn:hover { background: var(--border); transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--accent-green);
  color: #000;
  border-color: var(--accent-green);
  font-weight: 600;
}
.btn-primary:hover { background: #2ea043; border-color: #2ea043; }

.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.8rem; }

/* Copy button feedback */
.btn.copied {
  background: var(--accent-green) !important;
  color: #000 !important;
  border-color: var(--accent-green) !important;
}

/* Stats bar */
.stats-bar {
  display: flex;
  gap: 1.5rem;
  padding: 1rem;
  background: var(--bg-tertiary);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
}
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.stat-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent-cyan);
}
.stat-label {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Toolbar */
.toolbar {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 1rem;
}

/* Cards (landing page) */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.tool-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: all 0.25s;
  display: flex;
  flex-direction: column;
}
.tool-card:hover {
  border-color: var(--accent-green);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(63,185,80,0.12);
  text-decoration: none;
}
.tool-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}
.tool-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  flex: 1;
  line-height: 1.6;
}
.tool-card .tag {
  display: inline-block;
  background: rgba(63, 185, 80, 0.1);
  color: var(--accent-green);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.25rem 0.6rem;
  border-radius: 4px;
  margin-top: 0.75rem;
  align-self: flex-start;
  border: 1px solid rgba(63, 185, 80, 0.2);
}

/* Diff styles */
.diff-add { background: rgba(63,185,80,0.15); color: var(--accent-green); }
.diff-remove { background: rgba(248,81,73,0.15); color: var(--accent-red); }
.diff-line { padding: 0.15rem 0.5rem; font-family: var(--font-mono); font-size: 0.85rem; white-space: pre-wrap; }
.diff-line-num { color: var(--text-muted); min-width: 3rem; display: inline-block; user-select: none; }

/* Match highlight */
.match-highlight { background: rgba(210,153,34,0.3); border-radius: 2px; padding: 0 2px; }

/* Markdown preview */
.markdown-body { color: var(--text-primary); line-height: 1.8; }
.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
  margin: 1.5rem 0 0.75rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--border);
}
.markdown-body h1 { font-size: 1.8rem; }
.markdown-body h2 { font-size: 1.4rem; }
.markdown-body h3 { font-size: 1.2rem; border-bottom: none; }
.markdown-body p { margin: 0.75rem 0; }
.markdown-body code {
  background: var(--bg-tertiary);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85em;
  border: 1px solid var(--border);
}
.markdown-body pre {
  background: var(--bg-tertiary);
  padding: 1rem;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid var(--border);
}
.markdown-body pre code { background: none; padding: 0; border: none; }
.markdown-body ul, .markdown-body ol { padding-left: 2rem; margin: 0.75rem 0; }
.markdown-body blockquote {
  border-left: 3px solid var(--accent-cyan);
  padding-left: 1rem;
  color: var(--text-secondary);
  margin: 1rem 0;
}
.markdown-body table { border-collapse: collapse; width: 100%; margin: 1rem 0; }
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}
.markdown-body th { background: var(--bg-tertiary); }
.markdown-body a { color: var(--accent-cyan); }
.markdown-body img { max-width: 100%; border-radius: var(--radius); }
.markdown-body hr { border: none; border-top: 1px solid var(--border); margin: 2rem 0; }

/* JSON syntax highlighting */
.json-key { color: var(--accent-cyan); }
.json-string { color: var(--accent-green); }
.json-number { color: var(--accent-orange); }
.json-boolean { color: var(--accent-purple); }
.json-null { color: var(--accent-red); }

/* Regex */
.pattern-lib {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 0.5rem;
  margin-top: 0.5rem;
}
.pattern-item {
  background: var(--bg-tertiary);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  border: 1px solid transparent;
  transition: all 0.2s;
}
.pattern-item:hover { border-color: var(--accent-cyan); background: rgba(88, 166, 255, 0.08); }
.pattern-item .pattern-name { color: var(--text-primary); font-weight: 600; }
.pattern-item .pattern-regex { color: var(--accent-green); font-family: var(--font-mono); font-size: 0.75rem; }

/* Footer */
.site-footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
  .split-pane { grid-template-columns: 1fr; height: auto; }
  .pane { min-height: 280px; }
  .pane-body textarea { min-height: 200px; }
  .site-header {
    flex-direction: column;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
  }
  .site-header nav {
    width: 100%;
    justify-content: flex-start;
    gap: 0.15rem;
    padding-bottom: 0.25rem;
  }
  .site-header nav a {
    padding: 0.35rem 0.6rem;
    font-size: 0.82rem;
  }
  .container, .container-wide { padding: 1rem; }
  .stats-bar { gap: 0.75rem; justify-content: center; }
  .tool-grid { grid-template-columns: 1fr; }
  .toolbar {
    gap: 0.4rem;
    padding: 0.5rem 0.75rem;
  }
  .toolbar .btn { padding: 0.45rem 0.7rem; font-size: 0.8rem; }
  .hero h1 { font-size: 1.8rem; }
  .hero p { font-size: 1rem; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.5rem; }
  .stats-bar { flex-direction: row; flex-wrap: wrap; }
  .stat-value { font-size: 1.1rem; }
}

/* Landing hero */
.hero {
  text-align: center;
  padding: 4rem 0 2.5rem;
}
.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p {
  color: var(--text-secondary);
  font-size: 1.15rem;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  background: var(--accent-green);
  color: #000;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
}
.toast.show { transform: translateY(0); opacity: 1; }

/* Scrollbar */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* Ad container */
.ad-container {
  text-align: center;
  padding: 1rem;
  margin: 1rem 0;
  min-height: 90px;
}

/* Touch-friendly */
@media (pointer: coarse) {
  .btn { min-height: 44px; }
  input[type="text"], input[type="number"], select { min-height: 44px; }
  .tab { min-height: 44px; }
  .pattern-item { padding: 0.7rem 0.75rem; }
}