:root {
  --bg: #ffffff;
  --text: #1f2a37;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1e40af;
  --surface: #f7fafc;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", PingFangTC, "Noto Sans TC", "Microsoft JhengHei", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.container { max-width: 1120px; margin: 0 auto; padding: 0 16px; }

.site-header { position: sticky; top: 0; background: var(--bg); border-bottom: 1px solid var(--border); z-index: 50; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: inline-flex; align-items: center; text-decoration: none; }
.logo img { height: 40px; width: auto; display: block; }
.menu-toggle { display: none; border: 0; background: transparent; font-size: 24px; }
.nav ul { display: flex; gap: 24px; list-style: none; margin: 0; padding: 0; }
.nav a { color: var(--text); text-decoration: none; font-weight: 500; }
.nav a:hover { color: var(--primary); }

.hero { padding: 0; background: var(--bg); }
.hero img { width: 100%; height: auto; display: block; }
.btn { display: inline-block; padding: 10px 16px; border-radius: 8px; border: 1px solid var(--border); text-decoration: none; color: var(--text); background: #fff; }
.btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn.primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn:hover { border-color: var(--primary); color: var(--primary); }

.section { padding: 56px 0; }
.section.alt { background: var(--surface); }
.section-header h2 { margin: 0 0 8px; font-size: 24px; }
.section-header p { margin: 0 0 24px; color: var(--muted); }
/* emphasize h2 */
.section-header h2 {
  font-size: 30px;
  color: var(--primary-dark);
  letter-spacing: 0.5px;
  padding-left: 10px;
  border-left: 6px solid var(--primary);
}

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card { padding: 20px; border: 1px solid var(--border); border-radius: 12px; background: #fff; display: flex; flex-direction: column; gap: 12px; }
.card h3 { margin: 0; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }

.about { display: grid; gap: 12px; }

.org { margin-top: 24px; display: grid; gap: 16px; }
.org h2 { font-size: 30px; color: var(--primary-dark); letter-spacing: 0.5px; padding-left: 10px; border-left: 6px solid var(--primary); }
.org-banner { display: flex; justify-content: center; }
.org-banner img { width: 100%; max-width: 720px; height: auto; display: block; border-radius: 8px; border: 1px solid var(--border); }
.org-groups { display: grid; grid-template-columns: 1fr; gap: 12px; }
.org-group { padding: 0; border: 0; border-radius: 0; background: transparent; display: grid; gap: 8px; }
.org-group h4 { margin: 0; font-size: 18px; color: var(--primary); font-weight: 700; border-left: 4px solid var(--primary); padding-left: 8px; }
.org-names { display: block; line-height: 1.8; color: var(--text); }
.org-names span { display: inline; padding: 0; border: 0; border-radius: 0; background: transparent; margin-right: 12px; font-size: 15px; }

.charter { margin-top: 24px; display: grid; gap: 16px; }
.charter h2 { font-size: 30px; color: var(--primary-dark); letter-spacing: 0.5px; padding-left: 10px; border-left: 6px solid var(--primary); }
.chapter { padding: 16px; border: 1px solid var(--border); border-radius: 10px; background: #fff; display: grid; gap: 8px; }
.chapter h3 { margin: 0; font-size: 18px; color: var(--text); }
.chapter h4 { margin: 0; font-size: 16px; color: var(--muted); }
.charter-list { margin: 0; padding-left: 18px; display: grid; gap: 6px; }
.charter-list li { color: var(--text); }

.contact { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.contact-item { padding: 16px; border: 1px solid var(--border); border-radius: 10px; background: #fff; }
.contact-item a { color: var(--primary); text-decoration: none; }
.contact-item a:hover { text-decoration: underline; }

.site-footer { border-top: 1px solid var(--border); padding: 24px 0; background: #fff; }
.footer-inner { text-align: center; color: var(--muted); }

@media (max-width: 960px) {
  .grid { grid-template-columns: repeat(2, 1fr); }
  .contact { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .menu-toggle { display: inline-block; }
  .nav { position: absolute; top: 64px; left: 0; right: 0; background: var(--bg); border-bottom: 1px solid var(--border); display: none; }
  .nav.open { display: block; }
  .nav ul { flex-direction: column; padding: 12px; gap: 12px; }
  .grid { grid-template-columns: 1fr; }
  .hero { padding: 56px 0; }
  .hero h1 { font-size: 26px; }
}