/* 基础样式定义 */
:root {
  --retro-brown: #964B00;
  --futuristic-blue: #1E90FF;
  --coral-orange: #FF7F50;
  --deep-navy: #003366;
  --background-gradient: linear-gradient(135deg, #ffffff, #D3D3D3);
  --hover-glow: radial-gradient(circle, rgba(255, 255, 255, 0.4), transparent);
  --shadow-effect: 0px 4px 15px rgba(0, 0, 0, 0.2);
}

body {
  font-family: 'Roboto', sans-serif;
  background: var(--background-gradient);
  color: var(--retro-brown);
  margin: 0;
  padding: 0;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  align-items: center;
}

header {
  width: 100%;
  text-align: center;
  padding: 2rem 0;
  background: linear-gradient(to right, var(--deep-navy), var(--futuristic-blue));
  color: white;
  font-family: 'Bodoni', serif;
  font-size: 2.5rem;
  text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.3);
}

.container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
  max-width: 1200px;
  padding: 2rem;
  margin: 0 auto;
}

section {
  background: white;
  border-radius: 10px;
  box-shadow: var(--shadow-effect);
  padding: 20px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

section:hover {
  transform: translateY(-5px);
  box-shadow: 0px 8px 20px rgba(0, 0, 0, 0.3);
}

h1, h2, h3 {
  font-family: 'Bodoni', serif;
  color: var(--retro-brown);
  text-align: center;
}

p {
  font-family: 'Roboto', sans-serif;
  color: var(--futuristic-blue);
  text-align: justify;
}

pre {
  background: var(--deep-navy);
  color: white;
  padding: 15px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.9rem;
}

code {
  background: rgba(255, 255, 255, 0.1);
  padding: 2px 5px;
  border-radius: 4px;
}

.image-retro {
  filter: sepia(50%) contrast(1.2);
  border-radius: 10px;
  box-shadow: var(--shadow-effect);
}

.icon {
  width: 50px;
  height: 50px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.icon:hover {
  transform: scale(1.2);
  box-shadow: 0 0 15px var(--futuristic-blue);
}

button {
  background: linear-gradient(45deg, var(--futuristic-blue), var(--coral-orange));
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 25px;
  cursor: pointer;
  font-size: 1rem;
  transition: filter 0.3s ease;
}

button:hover {
  filter: blur(2px);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

th, td {
  border: 1px solid var(--retro-brown);
  padding: 10px;
  text-align: left;
}

th {
  background: var(--futuristic-blue);
  color: white;
}

@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
  }

  pre {
    font-size: 0.8rem;
  }
}