:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #e5e7eb;
  --accent: #eff6ff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

header {
  background: linear-gradient(135deg, #1d4ed8, #3b82f6);
  color: white;
  padding: 28px 20px;
}

.header-inner {
  max-width: 960px;
  margin: 0 auto;
}

header h1 {
  margin: 0 0 6px;
  font-size: 2rem;
}

header p {
  margin: 0;
  opacity: .9;
}

nav {
  background: white;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
}

.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  gap: 8px;
  padding: 10px 16px;
  overflow-x: auto;
}

nav a {
  color: var(--text);
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 999px;
  white-space: nowrap;
}

nav a:hover,
nav a.active {
  background: var(--accent);
  color: var(--primary-dark);
}

main {
  max-width: 960px;
  margin: 28px auto;
  padding: 0 16px 48px;
}

.hero,
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, .05);
}

.hero {
  margin-bottom: 20px;
}

.hero h2 {
  margin-top: 0;
  font-size: 1.6rem;
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.card h3 {
  margin-top: 0;
}

.badge {
  display: inline-block;
  background: var(--accent);
  color: var(--primary-dark);
  padding: 4px 10px;
  border-radius: 999px;
  font-size: .85rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.button {
  display: inline-block;
  margin-top: 12px;
  background: var(--primary);
  color: white;
  text-decoration: none;
  padding: 10px 16px;
  border-radius: 10px;
}

.button:hover {
  background: var(--primary-dark);
}

.notice {
  border-left: 5px solid var(--primary);
}

.meta {
  color: var(--muted);
  font-size: .92rem;
}

.checklist {
  padding-left: 1.3rem;
}

.checklist li {
  margin: 8px 0;
}

footer {
  text-align: center;
  color: var(--muted);
  padding: 24px 16px 40px;
  font-size: .9rem;
}

@media (max-width: 720px) {
  header h1 { font-size: 1.55rem; }
  .grid { grid-template-columns: 1fr; }
  .hero, .card { padding: 20px; }
}