/* ==========================================
   環境品質標準政策說明網站 - 全域樣式
   ========================================== */

/* 引入 Google Fonts - Noto Sans TC */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@300;400;500;700;900&display=swap');

/* CSS 變數定義 */
:root {
  /* 主色系 */
  --color-primary: #1e40af;        /* 深藍色 - 政府專業性與權威 */
  --color-primary-light: #3b82f6;  /* 淺藍色 */
  --color-primary-dark: #1e3a8a;   /* 更深藍色 - 更好對比度 */
  --color-primary-darker: #1e293b; /* 最深藍色 - 最佳對比度 */
  
  /* 輔色系 */
  --color-secondary: #059669;      /* 青綠色 - 環境與健康 */
  --color-secondary-light: #10b981; /* 淺綠色 */
  --color-secondary-dark: #047857;  /* 深綠色 */
  --color-secondary-darker: #065f46; /* 最深綠色 */
  
  /* 中性色 */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-900: #111827;
  
  /* 語意色彩 */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* 背景色 */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;
  
  /* 文字色 */
  --color-text-primary: #111827;
  --color-text-secondary: #4b5563;
  --color-text-tertiary: #6b7280;
  --color-text-inverse: #ffffff;
  
  /* 間距系統 */
  --spacing-xs: 0.5rem;    /* 8px */
  --spacing-sm: 0.75rem;   /* 12px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  --spacing-4xl: 6rem;     /* 96px */
  
  /* 圓角 */
  --radius-sm: 0.25rem;    /* 4px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  
  /* 陰影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* 過渡效果 */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* 容器寬度 */
  --container-max-width: 1280px;
  --container-padding: 2rem;
}

/* 重置與基礎樣式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: 400;
  line-height: 1.75;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  letter-spacing: 0.02em;
  text-rendering: optimizeLegibility;
}

/* 排版系統 */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  margin-top: 0;
  text-wrap: balance;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);  /* 響應式字體大小 */
  font-weight: 900;
  letter-spacing: -0.025em;
  line-height: 1.2;
  margin-bottom: var(--spacing-xl);
}

h2 {
  font-size: clamp(1.875rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: var(--spacing-xl);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

h4 {
  font-size: clamp(1.25rem, 2.5vw, 1.625rem);
  font-weight: 600;
  letter-spacing: -0.005em;
}

h5 {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  font-weight: 600;
}

h6 {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  font-weight: 600;
}

p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.8;
  text-wrap: pretty;
  orphans: 2;
  widows: 2;
}

/* 大段落樣式 */
.lead {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  line-height: 1.7;
  color: var(--color-text-primary);
  font-weight: 500;
  margin-bottom: var(--spacing-xl);
}

/* 小段落樣式 */
.text-sm {
  font-size: 0.925rem;
  line-height: 1.6;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* 容器系統 */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.container-fluid {
  width: 100%;
  padding: 0 var(--container-padding);
}

/* 導航列 */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: var(--color-bg-primary);
  box-shadow: var(--shadow-md);
  z-index: 1000;
  transition: all var(--transition-base);
}

.navbar-container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
}

.navbar-brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-secondary-dark));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 900;
  font-size: 1.25rem;
}

.navbar-logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.navbar-menu {
  display: flex;
  list-style: none;
  gap: var(--spacing-xl);
  align-items: center;
}

.navbar-menu a {
  color: var(--color-text-secondary);
  font-weight: 500;
  font-size: 0.9375rem;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  position: relative;
}

.navbar-menu a:hover {
  color: var(--color-primary);
  background-color: var(--color-gray-100);
}

.navbar-menu a.active {
  color: var(--color-primary);
  font-weight: 700;
}

.navbar-menu a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--spacing-md);
  right: var(--spacing-md);
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 2px;
}

/* 手機選單按鈕 */
.navbar-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.navbar-toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--color-text-primary);
  border-radius: 2px;
  transition: all var(--transition-base);
}

/* 主要內容區域 */
main {
  margin-top: 80px;
  min-height: calc(100vh - 80px);
}

/* Hero 區塊 */
/* Hero 區塊 */
.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-secondary-dark) 100%);
  color: var(--color-text-inverse);
  padding: var(--spacing-4xl) 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.2);
  z-index: 1;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 900;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text-inverse);
  letter-spacing: -0.03em;
  line-height: 1.1;
  text-wrap: balance;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero p {
  font-size: clamp(1.125rem, 3vw, 1.625rem);
  margin-bottom: var(--spacing-2xl);
  color: rgba(255, 255, 255, 0.95);
  line-height: 1.6;
  text-wrap: pretty;
  font-weight: 400;
  letter-spacing: 0.01em;
}

.hero .lead {
  font-size: clamp(1.25rem, 3.5vw, 1.75rem);
  font-weight: 500;
  color: rgba(255, 255, 255, 0.98);
}

/* 淺色 Hero 區塊樣式 */
.hero-light {
  background: linear-gradient(135deg, 
    rgba(30, 64, 175, 0.05) 0%, 
    rgba(249, 250, 251, 0.98) 30%, 
    rgba(255, 255, 255, 1) 50%, 
    rgba(249, 250, 251, 0.98) 70%, 
    rgba(5, 150, 105, 0.05) 100%
  );
  color: var(--color-text-primary);
  padding: var(--spacing-2xl) 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero-light::before {
  display: none;
}

.hero-light .hero-content {
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
}

.hero-light h1 {
  color: var(--color-gray-900);
  text-shadow: none;
}

.hero-light p {
  color: var(--color-text-secondary);
}

.hero-light .lead {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* 淺色 Hero 中的按鈕樣式 */
.hero-light .btn-secondary {
  background-color: var(--color-primary-dark);
  color: white;
  box-shadow: var(--shadow-lg);
}

.hero-light .btn-secondary:hover {
  background-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.hero-light .btn-outline {
  border-color: var(--color-primary-dark);
  color: var(--color-primary-dark);
  background-color: transparent;
}

.hero-light .btn-outline:hover {
  background-color: var(--color-primary-dark);
  color: white;
}

/* 頁面標題樣式 */
.page-title {
  font-size: clamp(2.25rem, 6vw, 3.25rem) !important;
  font-weight: 800 !important;
  line-height: 1.15 !important;
  letter-spacing: -0.025em !important;
  margin-bottom: var(--spacing-xl) !important;
  color: var(--color-gray-900) !important;
  text-wrap: balance;
}

.page-subtitle {
  font-size: clamp(1.125rem, 2.5vw, 1.5rem) !important;
  line-height: 1.6 !important;
  color: var(--color-text-secondary) !important;
  font-weight: 500 !important;
  margin-bottom: var(--spacing-2xl) !important;
  text-wrap: pretty;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.page-header {
  text-align: center;
  padding: var(--spacing-4xl) 0;
  background: linear-gradient(135deg, 
    rgba(30, 64, 175, 0.04) 0%, 
    rgba(249, 250, 251, 0.98) 30%,
    rgba(255, 255, 255, 1) 50%,
    rgba(249, 250, 251, 0.98) 70%,
    rgba(5, 150, 105, 0.04) 100%
  );
  margin-top: 80px;
  position: relative;
  overflow: hidden;
}

.page-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 50%, rgba(30, 64, 175, 0.02), transparent 70%);
  z-index: 1;
}

.page-header .container {
  position: relative;
  z-index: 2;
}

.page-category {
  display: inline-block;
  font-size: 0.875rem !important;
  font-weight: 600 !important;
  color: var(--color-primary-dark) !important;
  background-color: rgba(30, 58, 138, 0.12);
  padding: var(--spacing-xs) var(--spacing-lg);
  border-radius: var(--radius-xl);
  margin-bottom: var(--spacing-lg) !important;
  letter-spacing: 0.05em;
  text-transform: none;
  border: 1px solid rgba(30, 58, 138, 0.2);
  transition: all var(--transition-fast);
}

.page-category:hover {
  background-color: rgba(30, 58, 138, 0.15);
  transform: translateY(-1px);
}

/* 區塊系統 */
.section {
  padding: var(--spacing-4xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.section-title {
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-xl);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-wrap: balance;
  line-height: 1.3;
}

/* 特定背景的標題顏色 */
.section-title.text-primary {
  color: var(--color-primary-dark) !important;
}

.section-title.text-white {
  color: white !important;
}

/* 深色背景區塊的標題 */
.section[style*="background: linear-gradient"] .section-title,
.section[style*="var(--color-primary-dark)"] .section-title {
  color: white !important;
}

/* 深色背景區塊的文字 */
.section[style*="background: linear-gradient"] p,
.section[style*="var(--color-primary-dark)"] p {
  color: rgba(255, 255, 255, 0.95) !important;
}

/* 背景為白色或淺色時的標題 */
.section:not(.section-bg-gray):not([style*="background: linear-gradient"]) .section-title,
.hero .section-title {
  color: var(--color-primary-dark);
}

/* 背景為灰色時的標題 */
.section-bg-gray .section-title {
  color: var(--color-gray-900);
}

.section-subtitle {
  color: var(--color-text-secondary);
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.7;
  text-wrap: pretty;
  font-weight: 400;
}

.section-bg-gray {
  background-color: var(--color-bg-secondary);
}

/* 深色背景區塊樣式 */
.section-dark {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-secondary-dark));
  color: white;
  position: relative;
}

.section-dark::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.15);
  z-index: 1;
}

.section-dark .container {
  position: relative;
  z-index: 2;
}

.section-dark .section-title {
  color: white !important;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  font-weight: 800;
}

.section-dark p {
  color: rgba(255, 255, 255, 0.98) !important;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
  font-weight: 500;
}

.section-dark .btn-secondary {
  background-color: white;
  color: var(--color-primary-dark);
}

.section-dark .btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.9);
  transform: translateY(-2px);
}

.section-dark .btn-outline {
  border-color: white;
  color: white;
  background-color: transparent;
}

.section-dark .btn-outline:hover {
  background-color: white;
  color: var(--color-primary-dark);
}

/* 淺色背景區塊樣式 */
.section-light {
  background: linear-gradient(135deg, rgba(30, 64, 175, 0.05), rgba(5, 150, 105, 0.05));
}

.section-light .section-title {
  color: var(--color-gray-900) !important;
  font-weight: 800 !important;
}

.section-light .section-subtitle {
  color: var(--color-text-primary) !important;
  font-weight: 500 !important;
}

.section-light h3,
.section-light h4,
.section-light h5 {
  color: var(--color-gray-900) !important;
  font-weight: 700 !important;
}

.section-light p {
  color: var(--color-text-primary) !important;
}

/* 專門處理有背景漸層的區塊 */
.section[style*="linear-gradient"]:not([style*="var(--color-primary-dark)"]) .section-title {
  color: var(--color-gray-900) !important;
  font-weight: 800 !important;
}

.section[style*="linear-gradient"]:not([style*="var(--color-primary-dark)"]) .section-subtitle {
  color: var(--color-text-primary) !important;
  font-weight: 500 !important;
}

/* 卡片系統 */
.card {
  background-color: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  height: 100%;
  text-align: center;
}

.card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.card-icon {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.25rem;
  margin: 0 auto var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-secondary-dark));
  color: white;
}

.card-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-md);
}

/* 特殊背景下的卡片標題 */
.card-title.text-primary {
  color: var(--color-primary-dark);
}

.card-text {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* 網格系統 */
.grid {
  display: grid;
  gap: var(--spacing-xl);
}

.grid-cols-1 {
  grid-template-columns: repeat(1, 1fr);
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* 按鈕系統 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  text-align: center;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: var(--color-text-inverse);
}

.btn-secondary:hover {
  background-color: var(--color-secondary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

/* 標籤系統 */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-xl);
  background-color: var(--color-gray-100);
  color: var(--color-text-secondary);
}

.badge-primary {
  background-color: rgba(30, 64, 175, 0.1);
  color: var(--color-primary);
}

.badge-secondary {
  background-color: rgba(5, 150, 105, 0.1);
  color: var(--color-secondary);
}

/* 頁尾 */
.footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
  color: var(--color-text-inverse);
  margin-bottom: var(--spacing-lg);
}

.footer-section p,
.footer-section a {
  color: var(--color-gray-400);
  font-size: 0.9375rem;
}

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

.footer-bottom {
  border-top: 1px solid var(--color-gray-800);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: var(--color-gray-500);
  font-size: 0.875rem;
}

/* 確保頁尾內容在 container 內置中（只限頁尾，不變更全局 container 行為） */
.footer > .container {
  display: flex;
  justify-content: center;
  align-items: center;
}
.footer > .container p {
  margin: 0;
  text-align: center;
}

/* 響應式設計 */
@media (max-width: 1024px) {
  :root {
    --container-padding: 1.5rem;
  }
  
  h1 {
    font-size: 2.5rem;
  }
  
  h2 {
    font-size: 2rem;
  }
  
  h3 {
    font-size: 1.5rem;
  }
  
  .grid-cols-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-cols-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: 1rem;
  }
  
  h1 {
    font-size: 1.75rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  /* 手機版導航列優化：完全隱藏圖片 LOGO，只留品牌文字與漢堡按鈕 */
  .navbar-container {
    height: 50px;
    padding: 0 var(--spacing-sm);
  }
  
  /* 手機版不顯示圖片 LOGO，避免擋住畫面 */
  .navbar-logo {
    display: none;
  }
  
  .navbar-brand {
    font-size: 1rem;
    gap: var(--spacing-xs);
    flex-shrink: 1;
    width: auto;
  }
  
  .navbar-menu {
    display: none;
    position: absolute;
    top: 50px; /* 配合新的導航列高度 */
    left: 0;
    right: 0;
    background-color: var(--color-bg-primary);
    flex-direction: column;
    padding: var(--spacing-md);
    box-shadow: var(--shadow-lg);
    gap: 0;
    border-top: 1px solid var(--color-gray-200);
  }
  
  .navbar-menu.active {
    display: flex;
  }
  
  /* 調整主要內容區域的頂部間距 */
  main {
    margin-top: 50px; /* 配合新的導航列高度 */
    min-height: calc(100vh - 50px);
  }
  
  .page-header {
    margin-top: 50px; /* 配合新的導航列高度 */
  }
  
  .navbar-menu a {
    width: 100%;
    padding: var(--spacing-md);
  }
  
  .navbar-toggle {
    display: flex;
    width: 32px;
    height: 32px;
    padding: var(--spacing-xs);
  }
  
  .navbar-toggle span {
    width: 18px;
    height: 2px;
  }
  
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: 1fr;
  }
  
  /* 首頁 Hero 與區塊間距微調，讓首屏資訊更集中 */
  .hero {
    padding: var(--spacing-2xl) 0 var(--spacing-3xl);
  }
  
  .hero .lead,
  .hero p {
    font-size: 1rem;
    line-height: 1.7;
  }
  
  .section {
    padding: var(--spacing-2xl) 0 var(--spacing-3xl);
  }
  
  /* 首頁 Hero 主要按鈕：手機改為直向滿版，提高可點性 */
  .hero .flex {
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: stretch;
  }
  
  .hero .flex .btn {
    width: 100%;
    justify-content: center;
    min-height: 44px;
  }
  
  /* 三張挑戰卡片：在手機上縮短圖片高度、移除 hover 動畫 */
  .section .card {
    box-shadow: var(--shadow-md);
  }
  
  .section .card > div:first-child {
    height: 220px;
  }
  
  .section .card {
    transition: none;
  }
  
  .section .card[onmouseover] {
    /* 讓行內 onmouseover 不造成跳動 */
    transform: none !important;
  }
  
  /* 區塊標題與內文在手機上的字級優化 */
  .section-title {
    font-size: 1.5rem;
  }
  
  .section-subtitle {
    font-size: 1rem;
    line-height: 1.7;
  }
  
  /* 手機上主要段落的左右留白再多一些，閱讀更舒適 */
  .section .container,
  .hero .container {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }
  
  /* 社交按鈕在手機上略縮小並靠下顯示，不搶視線 */
  .social-buttons {
    right: 8px;
    bottom: 16px;
    gap: 8px;
  }
  
  .social-button {
    width: 40px;
    height: 40px;
  }
  
  .social-button svg {
    width: 18px;
    height: 18px;
  }
}

/* 工具類別 */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

/* 文字排版工具類別 */
.text-balance {
  text-wrap: balance;
}

.text-pretty {
  text-wrap: pretty;
}

/* 字體大小工具 */
.text-xs { font-size: 0.75rem; line-height: 1.5; }
.text-sm { font-size: 0.875rem; line-height: 1.6; }
.text-base { font-size: 1rem; line-height: 1.7; }
.text-lg { font-size: 1.125rem; line-height: 1.7; }
.text-xl { font-size: 1.25rem; line-height: 1.6; }
.text-2xl { font-size: 1.5rem; line-height: 1.5; }
.text-3xl { font-size: 1.875rem; line-height: 1.4; }
.text-4xl { font-size: 2.25rem; line-height: 1.3; }
.text-5xl { font-size: 3rem; line-height: 1.2; }

/* 字體重量 */
.font-light { font-weight: 300; }
.font-normal { font-weight: 400; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }
.font-black { font-weight: 900; }

/* 字母間距 */
.tracking-tight { letter-spacing: -0.025em; }
.tracking-normal { letter-spacing: 0em; }
.tracking-wide { letter-spacing: 0.025em; }
.tracking-wider { letter-spacing: 0.05em; }

/* 行高 */
.leading-tight { line-height: 1.25; }
.leading-snug { line-height: 1.375; }
.leading-normal { line-height: 1.5; }
.leading-relaxed { line-height: 1.625; }
.leading-loose { line-height: 2; }

/* 文字顏色 */
.text-primary { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-tertiary { color: var(--color-text-tertiary); }
.text-blue { color: var(--color-primary-dark); }
.text-blue-light { color: var(--color-primary); }
.text-green { color: var(--color-secondary); }
.text-white { color: white; }
.text-gray-900 { color: var(--color-gray-900); }

/* 間距工具 */
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

/* 響應式文字工具 */
@media (max-width: 768px) {
  .hero h1,
  .hero-light h1 {
    font-size: clamp(2rem, 8vw, 3rem);
    line-height: 1.15;
  }
  
  .hero p,
  .hero-light p {
    font-size: 1rem;
    line-height: 1.8;
  }
  
  /* Hero 區塊行動裝置優化 */
  .hero-light {
    padding: 2rem 1rem;
    min-height: auto;
  }
  
  /* 按鈕區塊行動裝置優化 */
  .flex {
    flex-direction: column;
    max-width: 320px;
    margin: 0 auto;
    gap: 1rem;
  }
  
  .btn {
    width: 100%;
    text-align: center;
    padding: 1rem 1.5rem;
  }
  
  /* 頁面標題響應式優化 */
  .page-title {
    font-size: clamp(1.875rem, 7vw, 2.75rem) !important;
    line-height: 1.2 !important;
  }
  
  /* 圖片自適應優化 */
  img {
    width: 100% !important;
    height: auto !important;
    max-width: 100%;
  }
  
  /* 段落優化 */
  p, .card-text {
    line-height: 1.8;
    font-size: 1rem;
  }
  
  .page-subtitle {
    font-size: clamp(1rem, 3vw, 1.25rem) !important;
  }
  
  .page-category {
    font-size: 0.75rem !important;
    padding: 0.375rem 0.75rem;
  }
  
  .page-header {
    padding: var(--spacing-2xl) 0;
  }
  
  .section-title {
    font-size: clamp(1.75rem, 6vw, 2.25rem);
  }
  
  .section-subtitle {
    font-size: clamp(1rem, 3vw, 1.125rem);
  }
  
  .text-lg {
    font-size: 1rem;
  }
  
  .text-xl {
    font-size: 1.125rem;
  }
  
  /* 手機版按鈕佈局 */
  .flex.gap-md {
    flex-direction: column;
    gap: var(--spacing-sm);
    align-items: center;
  }
  
  .flex.gap-md .btn {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }
}

/* 平板版按鈕佈局 */
@media (max-width: 480px) {
  .flex.gap-md {
    gap: var(--spacing-xs);
  }
  
  .flex.gap-md .btn {
    max-width: 240px;
    padding: 0.75rem 1.5rem !important;
    font-size: 1rem !important;
  }
}

/* 改善閱讀體驗 */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* 高對比度模式支援 */
@media (prefers-contrast: high) {
  body {
    --color-text-secondary: var(--color-text-primary);
  }
}
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Justify Content 工具 */
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

/* Align Items 工具 */
.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }

/* Flex Direction 工具 */
.flex-row { flex-direction: row; }
.flex-col { flex-direction: column; }

/* Gap 工具 */
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* 社交媒體按鈕樣式 */
.social-buttons {
  position: fixed;
  right: 20px;
  bottom: 20px;
  display: flex;
  flex-direction: column;
  gap: 15px;
  z-index: 1000;
}

.social-button {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  color: white;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  transition: all 0.3s ease;
  cursor: pointer;
}

.social-button:hover {
  transform: translateX(-5px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  color: white;
}

.social-button.facebook {
  background-color: #1877F2;
}

.social-button.facebook:hover {
  background-color: #166FE5;
}

.social-button.line {
  background-color: #00C300;
}

.social-button.line:hover {
  background-color: #00B900;
}

.social-button.top-button {
  background-color: #4A90A4;
}

.social-button.top-button:hover {
  background-color: #3A7A8C;
}

/* 社交媒體按鈕響應式設計 */
@media (max-width: 768px) {
  .social-buttons {
    right: 8px;
    bottom: 15px;
    gap: 8px;
  }
  
  .social-button {
    width: 40px;
    height: 40px;
    font-size: 0.875rem;
  }
  
  .social-button svg {
    width: 18px;
    height: 18px;
  }
}

/* YouTube 影片容器樣式 */
.video-container {
  position: relative;
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.video-container:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* 響應式設計 */
@media (max-width: 768px) {
  .video-container {
    max-width: 95%;
    border-radius: var(--radius-md);
  }
  
  .hero-light {
    padding: var(--spacing-xl) 0;
    min-height: 100vh;
  }
  
  .hero-light h1 {
    font-size: clamp(2rem, 8vw, 3rem) !important;
    margin-bottom: 0.75rem !important;
  }
  
  .hero-light .lead {
    font-size: clamp(1rem, 4vw, 1.25rem) !important;
    margin-bottom: 1rem !important;
  }
}

/* ==========================================
   無障礙優化 (Accessibility)
   ========================================== */

/* 焦點樣式優化 */
a:focus,
button:focus,
input:focus,
textarea:focus,
select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* 跳過連結 (Skip Links) */
.skip-link {
  position: absolute;
  top: -40px;
  left: 6px;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: 9999;
  border-radius: 4px;
}

.skip-link:focus {
  top: 6px;
}

/* 螢幕閱讀器專用內容 */
.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;
}

/* 高對比度支援 */
@media (prefers-contrast: high) {
  :root {
    --color-text-primary: #000000;
    --color-text-secondary: #2d2d2d;
    --color-primary: #0066cc;
  }
}

/* 減少動畫偏好支援 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ==========================================
   進階行動裝置優化
   ========================================== */

/* 小螢幕優化 (480px以下) */
@media (max-width: 480px) {
  .container {
    padding: 0 1rem;
  }
  
  .grid {
    grid-template-columns: 1fr !important;
    gap: 1rem;
  }
  
  .card {
    margin-bottom: 1rem;
    padding: 1.5rem;
  }
  
  .btn {
    font-size: 0.95rem;
    padding: 0.875rem 1.25rem;
  }
  
  .section-title {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
  }
  
  .navbar-menu {
    position: fixed;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100vh;
    background: white;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    transition: left 0.3s ease;
    z-index: 1000;
  }
  
  .navbar-menu.active {
    left: 0;
  }
  
  .navbar-menu li {
    margin: 1rem 0;
  }
  
  .navbar-menu a {
    font-size: 1.25rem;
    padding: 1rem;
  }
}