/* ToolForge - Clean, fast, developer tools */
:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --bg-input: #0d1117;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --red: #f85149;
  --green: #3fb950;
  --radius: 8px;
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'JetBrains Mono', 'Consolas', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

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

html { font-size: 16px; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 2rem;
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
}
.site-header .logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.site-header .logo .icon { font-size: 1.2rem; }
.site-header nav { display: flex; gap: 1.5rem; }
.site-header nav a {
  color: var(--text-dim);
  font-size: 0.875rem;
  transition: color 0.15s;
}
.site-header nav a:hover,
.site-header nav a.active { color: var(--text); }

/* Main */
main {
  flex: 1;
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Homepage */
.hero {
  text-align: center;
  padding: 4rem 0 3rem;
  position: relative;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(88,166,255,0.06) 0%, transparent 70%);
  pointer-events: none;
}
.hero h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--text) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero p { color: var(--text-dim); font-size: 1rem; }
.hero .hero-meta {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--text-dim);
}
.hero .hero-meta span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 2rem;
}
.tool-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color 0.15s, transform 0.15s;
  display: block;
  color: var(--text);
}
.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.tool-card .card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.75rem;
}
.tool-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}
.tool-card p {
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* Tool pages */
.tool-header {
  margin-bottom: 1.5rem;
}
.tool-header h1 {
  font-size: 1.3rem;
  font-weight: 600;
}
.tool-header p {
  color: var(--text-dim);
  font-size: 0.875rem;
  margin-top: 0.3rem;
}

/* Input / Output areas */
textarea, input[type="text"], input[type="number"], input[type="datetime-local"] {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: 0.75rem 1rem;
  resize: vertical;
  outline: none;
  transition: border-color 0.15s;
}
textarea:focus, input:focus {
  border-color: var(--accent);
}
textarea { min-height: 160px; }

.label-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}
.label-row label {
  font-size: 0.8rem;
  color: var(--text-dim);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s;
  font-family: var(--font-sans);
  white-space: nowrap;
}
.btn:hover { border-color: var(--accent); color: var(--accent); }
.btn-accent {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-accent:hover { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.75rem; }

.btn-group {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

/* Field spacing */
.field { margin-bottom: 1.25rem; }

/* Tabs */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}
.tab-btn {
  padding: 0.6rem 1.2rem;
  font-size: 0.85rem;
  font-weight: 500;
  background: none;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s;
  font-family: var(--font-sans);
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* JSON syntax highlighting */
.json-output {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  min-height: 160px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}
.json-key { color: #79c0ff; }
.json-string { color: #a5d6ff; }
.json-number { color: #79c0ff; }
.json-bool { color: #ff7b72; }
.json-null { color: #8b949e; }

/* Stats grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
}
.stat-card .stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-mono);
}
.stat-card .stat-label {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-top: 0.25rem;
}

/* Inline result */
.inline-result {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}
.inline-result input {
  flex: 1;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--green);
  color: var(--bg);
  padding: 0.5rem 1.2rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 500;
  z-index: 100;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.toast.show { opacity: 1; }

/* Error */
.error-msg {
  color: var(--red);
  font-size: 0.8rem;
  margin-top: 0.4rem;
  font-family: var(--font-mono);
}

/* -- Ad slots -------------------------------------------------- */
/* Default: hidden, zero layout impact when no ads are loaded.
   Set data-ad-preview="1" on <body> during development to see placeholders. */
.ad-slot {
  display: none;
  text-align: center;
  margin: 1.5rem 0;
  min-height: 0;
  overflow: hidden;
}

body[data-ad-preview="1"] .ad-slot {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 90px;
  background: var(--bg-card);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-dim);
  font-size: 0.8rem;
}
body[data-ad-preview="1"] .ad-slot::before {
  content: attr(data-ad-label);
}

/* When real ads render, they fill their own dimensions.
   common.js swaps .ad-slot → display:block once AdSense initialises. */
.ad-slot.loaded {
  display: block;
}

/* Back link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
}
.back-link:hover { color: var(--text); }

/* Footer */
footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
}

/* Responsive */
@media (max-width: 600px) {
  main { padding: 1rem; }
  .hero { padding: 2rem 0 1rem; }
  .hero h1 { font-size: 1.5rem; }
  .tool-grid { grid-template-columns: 1fr; }
  .site-header { padding: 0 0.75rem; gap: 0.75rem; }
  .site-header nav { gap: 0.6rem; flex-wrap: wrap; }
  .site-header nav a { font-size: 0.75rem; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
}