:root {
  --deep-blue: #1E3A8A;
  --bright-blue: #3B82F6;
  --green: #10B981;
  --light-gray: #F3F4F6;
  --orange: #FBBF24;
  --white: #FFFFFF;
  --dark-gray: #6B7280;
}

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

body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  color: var(--deep-blue);
  background: linear-gradient(135deg, var(--light-gray) 0%, var(--white) 100%);
  padding-top: 80px;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(90deg, var(--deep-blue) 0%, var(--bright-blue) 100%);
  color: var(--white);
  padding: 1rem 2rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.notice {
  background-color: var(--orange);
  color: var(--deep-blue);
  padding: 0.5rem 1rem;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: 0 2px 8px rgba(251,191,36,0.3);
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.intro-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
  align-items: center;
}

.intro-text {
  padding: 2rem;
}

.intro-text h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: var(--deep-blue);
  line-height: 1.2;
  text-shadow: 0 2px 4px rgba(30,58,138,0.1);
}

.intro-text p {
  font-size: 1.1rem;
  color: var(--dark-gray);
  margin-bottom: 1.5rem;
}

.intro-images {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.intro-images img {
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.intro-images img:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.15);
}

article {
  background-color: var(--white);
  border-radius: 16px;
  padding: 3rem;
  box-shadow: 0 8px 32px rgba(0,0,0,0.05);
  margin-bottom: 3rem;
}

article h2 {
  font-size: 2rem;
  color: var(--deep-blue);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--bright-blue);
}

article h3 {
  font-size: 1.5rem;
  color: var(--bright-blue);
  margin: 2rem 0 1rem;
}

article p {
  font-size: 1.1rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
  color: var(--dark-gray);
}

pre {
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
  overflow-x: auto;
  box-shadow: inset 0 0 8px rgba(0,0,0,0.05);
  border-left: 4px solid var(--bright-blue);
}

code {
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  color: var(--deep-blue);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  border-radius: 8px;
  overflow: hidden;
}

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--light-gray);
}

th {
  background-color: var(--bright-blue);
  color: var(--white);
  font-weight: 500;
}

tr:nth-child(even) {
  background-color: var(--light-gray);
}

tr:hover {
  background-color: rgba(59,130,246,0.05);
}

ol {
  margin: 2rem 0;
  padding-left: 2rem;
}

ol li {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
  color: var(--dark-gray);
}

ol li span {
  font-weight: 500;
  color: var(--deep-blue);
}

.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.image-gallery img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
  transition: all 0.3s ease;
}

.image-gallery img:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 24px rgba(0,0,0,0.15);
}

.btn {
  display: inline-block;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.3s ease;
  margin: 0.5rem 0;
}

.btn-primary {
  background-color: var(--bright-blue);
  color: var(--white);
  box-shadow: 0 4px 12px rgba(59,130,246,0.3);
}

.btn-primary:hover {
  background-color: var(--deep-blue);
  transform: translateY(-2px);
  box-shadow: 0 8px 16px rgba(59,130,246,0.4);
}

@media (max-width: 1024px) {
  .intro-section {
    grid-template-columns: 1fr;
  }
  
  .intro-images {
    order: -1;
  }
}

@media (max-width: 768px) {
  body {
    padding-top: 70px;
  }
  
  header {
    padding: 0.8rem 1rem;
  }
  
  .header-title {
    font-size: 1.2rem;
  }
  
  .notice {
    font-size: 0.8rem;
    padding: 0.3rem 0.6rem;
  }
  
  article {
    padding: 1.5rem;
  }
  
  article h2 {
    font-size: 1.5rem;
  }
  
  article h3 {
    font-size: 1.2rem;
  }
  
  .image-gallery {
    grid-template-columns: 1fr;
  }
}