:root {
  color-scheme: light dark;
  --bg: #0f1115;
  --surface: #181b21;
  --border: #2a2e37;
  --text: #e8e9ec;
  --muted: #9aa0ab;
  --accent: #5b8cff;
  --accent-text: #0b1020;
  --danger: #ff6b6b;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

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

.page-header {
  padding: 48px 24px 24px;
  max-width: 880px;
  margin: 0 auto;
}

.page-header h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.page-header p {
  margin: 0;
  color: var(--muted);
}

.tool-grid {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px 64px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.tool-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.tool-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.tool-card h3 {
  margin: 0 0 6px;
  color: var(--text);
  font-size: 17px;
}

.tool-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.empty-state {
  color: var(--muted);
}

.btn {
  display: inline-block;
  border: none;
  border-radius: var(--radius);
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  font-size: 14px;
  padding: 10px 18px;
  cursor: pointer;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.back-link {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--muted);
  font-size: 14px;
}

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