:root {
  --bg-main: #f5f5f7;
  --bg-card: #ffffff;
  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --accent-color: #0071e3;
  --accent-hover: #0077ed;
  --border-light: rgba(0, 0, 0, 0.08);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.06);
  --radius-card: 14px;
  --radius-btn: 10px;
  --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
}

body {
  background-color: var(--bg-main);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

#app {
  max-width: 1000px;
  margin: 0 auto;
  padding: 24px 16px;
}

.apple-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.apple-card:hover {
  box-shadow: var(--shadow-md);
}

.btn-primary {
  background-color: var(--text-primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-btn);
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.1s ease;
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  background-color: rgba(0, 0, 0, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-btn);
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.btn-secondary:hover {
  background-color: rgba(0, 0, 0, 0.08);
}