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

:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --border: #e5e5e5;
  --text: #1a1a1a;
  --text-muted: #888;
  --accent: #1a1a1a;
  --accent-light: #333;
  --error: #c0392b;
  --warning: #b8860b;
  --success: #2c7a5e;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.05);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.08);
}

body {
  font-family: 'Raleway', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.btn {
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  padding: 12px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s ease;
}

.btn:hover:not(:disabled) {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-light);
}