:root {
  --primary: #3498db;
  --primary-dark: #2c3e50;
  --accent: #16a085;
  --background: #f6f8fb;
  --surface: #ffffff;
  --text: #263238;
  --muted: #607d8b;
  --border: #dfe6e9;
  --warning-bg: #fff8e1;
  --warning-border: #f9a825;
  --shadow: 0 8px 24px rgba(44, 62, 80, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans TC", "Microsoft JhengHei", Arial, sans-serif;
  background: var(--background);
  color: var(--text);
  line-height: 1.75;
}

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

.site-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  padding: 56px 20px;
  text-align: center;
}

.site-header h1 {
  margin: 0 0 12px;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.2;
}

.site-header p {
  margin: 0;
  font-size: 1.1rem;
  opacity: 0.94;
}

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}

.nav-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.nav-inner a {
  color: var(--primary-dark);
  text-decoration: none;
  font-weight: 700;
  padding: 6px 10px;
  border-radius: 8px;
}

.nav-inner a:hover,
.nav-inner a.active {
  background: #eaf4fb;
  color: var(--primary);
}

main {
  max-width: 1180px;
  margin: 0 auto;
  padding: 36px 20px 56px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 26px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
}

.card h2,
.card h3 {
  margin-top: 0;
  line-height: 1.35;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.btn {
  display: inline-block;
  text-decoration: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-weight: 800;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-secondary {
  background: #fff;
  color: var(--primary-dark);
  border-color: var(--border);
}

.notice {
  background: var(--warning-bg);
  border-left: 6px solid var(--warning-border);
  border-radius: 12px;
  padding: 16px 18px;
  margin: 18px 0;
}

.tool-frame {
  width: 100%;
  min-height: 1050px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: #fff;
  box-shadow: var(--shadow);
}

.article-list {
  display: grid;
  gap: 16px;
}

.article-item {
  display: block;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
  text-decoration: none;
  color: var(--text);
  box-shadow: 0 4px 12px rgba(44, 62, 80, 0.05);
}

.article-item strong {
  display: block;
  color: var(--primary-dark);
  font-size: 1.08rem;
  margin-bottom: 6px;
}

.article-item span {
  color: var(--muted);
}

.meta {
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer {
  background: #fff;
  border-top: 1px solid var(--border);
  text-align: center;
  padding: 28px 20px;
  color: var(--muted);
}

.site-footer a {
  color: var(--primary-dark);
  text-decoration: none;
  margin: 0 8px;
}

@media (max-width: 768px) {
  .site-header {
    padding: 42px 18px;
  }

  .nav-inner {
    justify-content: flex-start;
    overflow-x: auto;
    flex-wrap: nowrap;
  }

  .tool-frame {
    min-height: 900px;
  }

  .card {
    padding: 20px;
  }
}