:root {
  --color-primary: #0a4d3c;
  --color-primary-hover: #07382c;
  --color-gold: #b37d2e;
  
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  
  --text-main: #1e293b;
  --text-sub: #475569;
  --text-muted: #94a3b8;
  
  --border-light: #e2e8f0;
  --border-card: #e2e8f0;

  --color-blue: #0284c7;
  --color-blue-bg: #e0f2fe;
  --color-amber: #d97706;
  --color-amber-bg: #fef3c7;

  --font-base: 'Noto Sans TC', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', Consolas, monospace;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* 頂部導航 */
.site-header {
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 0.9rem;
}

.brand-link {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-logo {
  height: 38px;
  width: auto;
  display: block;
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.org-name {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.3;
}

.site-title {
  font-size: 0.75rem;
  color: var(--text-sub);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-sub);
  text-decoration: none;
  padding: 0.45rem 0.85rem;
  border-radius: 6px;
  transition: all 0.15s ease;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: #f1f5f9;
}

.nav-link.active {
  color: var(--color-primary);
  font-weight: 700;
  background-color: #eaf3f0;
}

/* 導覽列下拉選單 */
.nav-dropdown {
  position: relative;
}

.dropdown-arrow {
  transition: transform 0.2s ease;
}

.nav-dropdown:hover .dropdown-arrow {
  transform: rotate(180deg);
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  background-color: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
  min-width: 210px;
  padding: 0.4rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: all 0.15s ease;
  z-index: 200;
}

.nav-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item {
  display: block;
  padding: 0.55rem 0.85rem;
  font-size: 0.825rem;
  color: var(--text-main);
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.15s ease;
}

.dropdown-item:hover {
  background-color: #f1f5f9;
  color: var(--color-primary);
}

.dropdown-divider {
  height: 1px;
  background-color: var(--border-light);
  margin: 0.3rem 0;
}

.dropdown-item.all-docs {
  font-weight: 600;
  color: var(--color-primary);
}

/* 主內容區 */
.main-content {
  flex: 1;
  max-width: 1140px;
  width: 100%;
  margin: 0 auto;
  padding: 2.25rem 1.5rem 4rem;
}

/* 頁面標題（精簡緊湊） */
.page-header {
  margin-bottom: 2rem;
}

.title-group {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
}

.accent-bar {
  width: 4px;
  height: 34px;
  background-color: var(--color-gold);
  border-radius: 2px;
  flex-shrink: 0;
  margin-top: 3px;
}

.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.25;
}

.page-intro {
  font-size: 0.925rem;
  color: var(--text-sub);
  margin-top: 0.35rem;
}

/* 檢定卡片網格（乾淨簡約，無多餘小字） */
.exam-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.exam-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 12px;
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.exam-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.06);
}

.card-top {
  flex: 1;
}

.card-badge-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
}

.code-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.badge-indoor {
  background-color: var(--color-blue-bg);
  color: var(--color-blue);
}

.badge-industrial {
  background-color: var(--color-amber-bg);
  color: var(--color-amber);
}

.card-category-text {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.card-exam-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 0.65rem;
}

.card-exam-desc {
  font-size: 0.9rem;
  color: var(--text-sub);
  line-height: 1.65;
}

.card-btn-group {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 0.75rem;
  margin-top: 1.75rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-light);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.65rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.15s ease;
}

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

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

.btn-outline {
  background-color: #ffffff;
  color: var(--text-main);
  border: 1px solid var(--border-light);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: #f8fafc;
}

/* ============================================================
   資料專區 (resources.html)
   ============================================================ */

.tab-nav {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.5rem;
}

.tab-item {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-sub);
  text-decoration: none;
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  transition: all 0.15s ease;
}

.tab-item:hover {
  color: var(--color-primary);
  background-color: #f1f5f9;
}

.tab-item.active {
  background-color: var(--color-primary);
  color: #ffffff;
}

.doc-group-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 12px;
  padding: 1.75rem 2rem;
  margin-bottom: 2.25rem;
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.03);
}

.group-header {
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 1rem;
  margin-bottom: 1.5rem;
}

.group-title-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.group-code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  background-color: #f1f5f9;
  color: var(--text-secondary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
}

.group-title-row h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.file-section {
  margin-bottom: 1.75rem;
}

.file-section:last-child {
  margin-bottom: 0;
}

.section-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-sub);
  margin-bottom: 0.85rem;
  padding-left: 0.5rem;
  border-left: 3px solid var(--color-gold);
}

.file-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(460px, 1fr));
  gap: 0.75rem;
}

.file-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  background-color: #ffffff;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  text-decoration: none;
  color: inherit;
  transition: all 0.15s ease;
}

.file-row:hover {
  border-color: var(--color-primary);
  background-color: #fcfdfd;
}

.file-ext {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 700;
  background-color: #fee2e2;
  color: #dc2626;
  padding: 0.25rem 0.45rem;
  border-radius: 4px;
  flex-shrink: 0;
}

.file-info {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.file-badge {
  align-self: flex-start;
  font-size: 0.675rem;
  font-weight: 600;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  margin-bottom: 0.2rem;
}

.badge-practical {
  background-color: #eaf3f0;
  color: var(--color-primary);
}

.badge-theory {
  background-color: var(--color-blue-bg);
  color: var(--color-blue);
}

.badge-common {
  background-color: #f1f5f9;
  color: #64748b;
}

.file-name {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-main);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-icon-arrow {
  color: var(--text-muted);
  display: flex;
  align-items: center;
  flex-shrink: 0;
  transition: transform 0.15s ease, color 0.15s ease;
}

.file-row:hover .file-icon-arrow {
  color: var(--color-primary);
  transform: translateX(2px);
}

/* 頁尾 */
.site-footer {
  background-color: var(--color-primary);
  color: #d1fae5;
  padding: 2rem 1.5rem;
  margin-top: auto;
}

.footer-inner {
  max-width: 1140px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
}

.footer-org {
  color: #ffffff;
  font-weight: 700;
  font-size: 0.9375rem;
}

.footer-note {
  color: #a7f3d0;
  font-size: 0.75rem;
  margin-top: 0.15rem;
}

.footer-copy {
  font-family: var(--font-mono);
  color: #d1fae5;
}

/* 響應式佈局 */
@media (max-width: 860px) {
  .exam-grid, .file-list-grid {
    grid-template-columns: 1fr;
  }
  .card-btn-group {
    grid-template-columns: 1fr;
  }
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.75rem;
  }
  .nav-menu {
    width: 100%;
    border-top: 1px solid var(--border-light);
    padding-top: 0.65rem;
  }
  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    padding-left: 1rem;
    opacity: 1;
    visibility: visible;
    transform: none;
    display: none;
  }
  .nav-dropdown:hover .dropdown-menu {
    display: block;
  }
  .footer-inner {
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
  }
}