* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* 多彩渐变主题 */
:root {
  --primary: #7B2CBF;
  --secondary: #42A5F5;
  --accent: #FF6F00;
  --light: #f5f5f5;
  --dark: #212121;
}

body {
  background: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
  color: var(--dark);
  line-height: 1.6;
}

/* 导航栏 */
header {
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  padding: 1rem 2rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 999;
}
.navbar {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: white;
  font-size: 1.5rem;
  font-weight: bold;
  text-decoration: none;
}
.logo img {
  height: 40px;
}
.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: 0.3s;
}
.nav-links a:hover {
  color: var(--accent);
}

/* 容器 */
.container {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 1rem;
}

/* 卡片样式 */
.card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 3px 15px rgba(0,0,0,0.08);
  transition: 0.3s;
}
.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0,0,0,0.12);
}
.card h2 {
  color: var(--primary);
  margin-bottom: 1rem;
}
.card p {
  margin-bottom: 1rem;
  color: #444;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--accent);
  color: white;
  border-radius: 8px;
  text-decoration: none;
  font-weight: bold;
  transition: 0.3s;
  border: none;
  cursor: pointer;
}
.btn:hover {
  background: var(--primary);
  color: white;
}

/* 产品图片 */
.product-img {
  width: 100%;
  max-width: 600px;
  border-radius: 10px;
  margin: 1rem 0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

/* 列表网格 */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

/* 页脚 */
footer {
  background: var(--dark);
  color: white;
  text-align: center;
  padding: 2rem;
  margin-top: 3rem;
}

/* 404页面 */
.error-page {
  text-align: center;
  padding: 4rem 0;
}
.error-page h1 {
  font-size: 6rem;
  color: var(--accent);
}
.error-page h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
  color: var(--primary);
}