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

:root {
  --bg: #0f0f0f;
  --surface: #1a1a1a;
  --surface-hover: #252525;
  --border: #333;
  --text: #e0e0e0;
  --text-muted: #888;
  --accent: #4a9eff;
  --accent-hover: #6ab0ff;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 3rem;
}

header h1 {
  font-size: 2.5rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* Tools Grid */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  text-decoration: none;
  color: inherit;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
}

.tool-card:hover {
  background: var(--surface-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
}

.tool-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.75rem;
}

.tool-name {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.tool-description {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Footer */
footer {
  margin-top: auto;
  padding-top: 3rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Tool Page Styles */
.tool-header {
  margin-bottom: 2rem;
}

.back-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  display: inline-block;
  margin-bottom: 1rem;
}

.back-link:hover {
  color: var(--accent);
}

.tool-header h1 {
  font-size: 2rem;
}

/* Common Tool Elements */
.tool-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

textarea, input[type="text"] {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-family: 'Monaco', 'Menlo', monospace;
  font-size: 0.9rem;
  padding: 1rem;
  resize: vertical;
}

textarea:focus, input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover {
  background: var(--accent-hover);
}

button.secondary {
  background: var(--surface-hover);
  color: var(--text);
}

button.secondary:hover {
  background: var(--border);
}

.button-group {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.output-box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  font-family: 'Monaco', 'Menlo', monospace;
  font-size: 0.9rem;
  word-break: break-all;
  min-height: 50px;
}

.status-message {
  color: var(--accent);
  font-size: 0.85rem;
  margin-top: 0.5rem;
  min-height: 1.2em;
}

.error {
  color: #ff6b6b;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.section {
  margin-bottom: 1.5rem;
}

.section:last-child {
  margin-bottom: 0;
}