/* 香港衛生署網站 - 主題樣式 */

/* === CSS 變數 (香港政府網站綠色主題) === */
:root {
  /* 主要顏色 */
  --primary-green: #006a4d;
  --primary-green-dark: #004d36;
  --primary-green-light: #e8f5ee;
  --secondary-green: #00965e;
  
  /* 文字顏色 */
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-light: #ffffff;
  --text-muted: #666666;
  
  /* 背景顏色 */
  --bg-white: #ffffff;
  --bg-light: #f5f5f5;
  --bg-pattern: #f8faf8;
  
  /* 邊框及分隔線 */
  --border-color: #d4e0d8;
  --border-dark: #b8c9ba;
  
  /* 功能色 */
  --accent-gold: #c8a961;
  --link-blue: #0055a3;
  --error-red: #b81c1c;
  
  /* 間距 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  /* 陰影 */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  
  /* 圓角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* 過渡動畫 */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

/* === 基礎重置 === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: "Noto Sans TC", "Microsoft JhengHei", "PingFang TC", 
               "Heiti TC", sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-white);
}

/* === 導航列 === */
.navbar {
  background-color: var(--primary-green);
  color: var(--text-light);
  padding: var(--spacing-md) var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

.navbar-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
  color: var(--text-light);
}

.navbar-logo {
  width: 48px;
  height: 48px;
  background-color: var(--text-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: var(--primary-green);
  font-size: 14px;
}

.navbar-title {
  font-size: 1.25rem;
  font-weight: 600;
}

.navbar-subtitle {
  font-size: 0.85rem;
  opacity: 0.9;
}

.navbar-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  flex-wrap: wrap;
}

.navbar-links a {
  color: var(--text-light);
  text-decoration: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
  font-size: 0.95rem;
}

.navbar-links a:hover,
.navbar-links a:focus {
  background-color: rgba(255, 255, 255, 0.15);
  outline: none;
}

/* === 頁面標題區 === */
.hero {
  background: linear-gradient(135deg, var(--primary-green) 0%, var(--primary-green-dark) 100%);
  color: var(--text-light);
  padding: var(--spacing-xxl) var(--spacing-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.3;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  letter-spacing: 2px;
}

.hero p {
  font-size: 1.1rem;
  opacity: 0.95;
  max-width: 600px;
  margin: 0 auto;
}

/* === 內容區域 === */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xxl) var(--spacing-lg);
}

/* === 部門分類標題 === */
.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xxl);
}

.section-title h2 {
  font-size: 1.75rem;
  color: var(--primary-green);
  margin-bottom: var(--spacing-sm);
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: "";
  position: absolute;
  bottom: -8px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 3px;
  background-color: var(--accent-gold);
  border-radius: 2px;
}

.section-title p {
  color: var(--text-secondary);
  margin-top: var(--spacing-md);
}

/* === 部門卡片 === */
.departments-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xxl);
}

.department-card {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.department-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-green-light);
}

.department-header {
  background: linear-gradient(135deg, var(--primary-green) 0%, var(--secondary-green) 100%);
  color: var(--text-light);
  padding: var(--spacing-lg);
  position: relative;
}

.department-header::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 100px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 0 0 0 100%;
}

.department-abbr {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  opacity: 0.8;
  margin-bottom: var(--spacing-xs);
}

.department-name {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.department-desc {
  font-size: 0.9rem;
  opacity: 0.9;
  line-height: 1.5;
}

.department-body {
  padding: var(--spacing-lg);
}

.department-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--primary-green);
  text-decoration: none;
  font-weight: 500;
  padding: var(--spacing-sm) 0;
  transition: color var(--transition-fast);
}

.department-link:hover {
  color: var(--primary-green-dark);
  text-decoration: underline;
}

.department-link svg {
  width: 16px;
  height: 16px;
}

.sub-units {
  margin-top: var(--spacing-md);
}

.sub-units-title {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.sub-units-list {
  list-style: none;
}

.sub-units-list li {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px dashed var(--border-color);
  font-size: 0.95rem;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--spacing-md);
}

.sub-units-list li:last-child {
  border-bottom: none;
}

.sub-unit-name {
  color: var(--text-primary);
  font-weight: 500;
}

.sub-unit-desc {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* === 頁尾 === */
.footer {
  background-color: var(--primary-green-dark);
  color: var(--text-light);
  padding: var(--spacing-xl) var(--spacing-lg);
  margin-top: var(--spacing-xxl);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
}

.footer-section h4 {
  font-size: 1rem;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--accent-gold);
  display: inline-block;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--text-light);
}

.footer-bottom {
  max-width: 1200px;
  margin: var(--spacing-xl) auto 0;
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.8;
}

/* === 響應式設計 === */
@media (max-width: 768px) {
  .navbar-container {
    flex-direction: column;
    text-align: center;
  }
  
  .navbar-links {
    justify-content: center;
    gap: var(--spacing-sm);
  }
  
  .hero h1 {
    font-size: 1.75rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .main-content {
    padding: var(--spacing-xl) var(--spacing-md);
  }
  
  .departments-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-container {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .navbar-logo {
    width: 40px;
    height: 40px;
    font-size: 12px;
  }
  
  .navbar-title {
    font-size: 1.1rem;
  }
  
  .hero {
    padding: var(--spacing-xl) var(--spacing-md);
  }
  
  .hero h1 {
    font-size: 1.5rem;
  }
  
  .department-header {
    padding: var(--spacing-md);
  }
  
  .department-body {
    padding: var(--spacing-md);
  }
}

/* === 動畫效果 === */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.department-card {
  animation: fadeInUp 0.5s ease forwards;
}

.department-card:nth-child(1) { animation-delay: 0.1s; }
.department-card:nth-child(2) { animation-delay: 0.2s; }
.department-card:nth-child(3) { animation-delay: 0.3s; }
.department-card:nth-child(4) { animation-delay: 0.4s; }

/* === 無障礙設計 === */
a:focus,
button:focus {
  outline: 2px solid var(--accent-gold);
  outline-offset: 2px;
}

/* 跳過導航連結 */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-green);
  color: var(--text-light);
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: 1001;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* 畫面閱讀程式專用 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}