/* 全站基礎樣式 */
:root {
  --bg: #f7fafc;
  --fg: #1a202c;
  --muted: #4a5568;
  --accent: #2c5282;
  --border: #e2e8f0;
  --max-width: 1200px;
  font-family:
    'Noto Sans TC', '-apple-system', 'BlinkMacSystemFont', 'PingFang TC',
    'Microsoft JhengHei', sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, picture, video, svg { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); }

h1, h2, h3, h4 {
  line-height: 1.3;
  color: var(--fg);
  font-weight: 700;
}
h1 { font-size: clamp(2rem, 5vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2.25rem); }

main { min-height: 60vh; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 4rem 0;
}

.btn {
  display: inline-block;
  background: var(--fg);
  color: #fff;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 500;
  border: 0;
  cursor: pointer;
  font-size: 1rem;
}
.btn:hover { background: #2d3748; }
.btn--ghost {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--fg);
}
.btn--ghost:hover { background: var(--fg); color: #fff; }