/* 現代極簡風格 CSS */

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

:root {
  --primary-color: #2c3e50;
  --accent-color: #3498db;
  --text-color: #333;
  --text-light: #666;
  --bg-color: #ffffff;
  --card-bg: #f8f9fa;
  --border-color: #e0e0e0;
  --hover-color: #2980b9;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, 'Noto Sans', sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* 導航列樣式 */
header {
  background-color: var(--bg-color);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.95);
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 2rem;
  display: flex;
  gap: 2rem;
  align-items: center;
}

nav a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  letter-spacing: 0.3px;
  transition: color 0.3s ease;
  position: relative;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-color);
  transition: width 0.3s ease;
}

nav a:hover {
  color: var(--accent-color);
}

nav a:hover::after {
  width: 100%;
}

/* 主要內容區域 */
main {
  flex: 1;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 4rem 2rem;
}

/* 卡片樣式 */
.card {
  background-color: var(--card-bg);
  border-radius: 12px;
  padding: 3rem;
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

/* 標題樣式 */
h1 {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary-color);
  margin-bottom: 1rem;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 1rem;
  letter-spacing: -0.3px;
}

/* 段落樣式 */
p {
  color: var(--text-light);
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

/* 連結樣式 */
.card a {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.3s ease;
  padding: 0.5rem 0;
}

.card a:hover {
  color: var(--hover-color);
  transform: translateX(4px);
}

/* 響應式設計 */
@media (max-width: 768px) {
  nav {
    padding: 1rem;
    gap: 1rem;
    flex-wrap: wrap;
  }
  
  nav a {
    font-size: 0.9rem;
  }
  
  main {
    padding: 2rem 1rem;
  }
  
  .card {
    padding: 2rem 1.5rem;
    border-radius: 8px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  p {
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.75rem;
  }
  
  h2 {
    font-size: 1.25rem;
  }
  
  .card {
    padding: 1.5rem;
  }
}

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

.card {
  animation: fadeIn 0.6s ease-out;
}

.card:nth-child(2) {
  animation-delay: 0.1s;
}

.card:nth-child(3) {
  animation-delay: 0.2s;
}