/* ===== 全局样式 ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: #333;
  background-color: #f5f7fa;
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: #2c6ecb;
}

a:hover {
  color: #1a4f9e;
}

/* ===== 顶部导航 ===== */
.header {
  background: linear-gradient(135deg, #1a3a6b 0%, #2c6ecb 100%);
  color: #fff;
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

.logo {
  font-size: 22px;
  font-weight: 700;
  padding: 16px 0;
  letter-spacing: 1px;
}

.logo span {
  color: #7eb8ff;
}

.nav {
  display: flex;
  list-style: none;
}

.nav li a {
  display: block;
  color: #dce6f5;
  padding: 18px 18px;
  font-size: 15px;
  transition: background 0.2s, color 0.2s;
}

.nav li a:hover,
.nav li a.active {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

/* ===== 横幅 ===== */
.banner {
  background: linear-gradient(135deg, #1a3a6b 0%, #2c6ecb 50%, #4a90e2 100%);
  color: #fff;
  text-align: center;
  padding: 80px 20px;
}

.banner h1 {
  font-size: 38px;
  margin-bottom: 16px;
  font-weight: 700;
}

.banner p {
  font-size: 18px;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* ===== 主内容区 ===== */
.main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 20px;
}

.section-title {
  font-size: 26px;
  color: #1a3a6b;
  margin-bottom: 24px;
  padding-bottom: 10px;
  border-bottom: 3px solid #2c6ecb;
  display: inline-block;
}

/* ===== 卡片网格 ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
  margin-top: 20px;
}

.card {
  background: #fff;
  border-radius: 10px;
  padding: 28px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.1);
}

.card h3 {
  color: #1a3a6b;
  font-size: 18px;
  margin-bottom: 10px;
}

.card p {
  color: #666;
  font-size: 14px;
  line-height: 1.8;
}

.card .tag {
  display: inline-block;
  background: #e8f0fe;
  color: #2c6ecb;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  margin-top: 12px;
  margin-right: 6px;
}

/* ===== 关于页面 ===== */
.about-content {
  background: #fff;
  border-radius: 10px;
  padding: 36px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.about-content h2 {
  color: #1a3a6b;
  font-size: 22px;
  margin-bottom: 16px;
  margin-top: 24px;
}

.about-content h2:first-child {
  margin-top: 0;
}

.about-content p {
  color: #555;
  font-size: 15px;
  line-height: 2;
  margin-bottom: 12px;
}

.about-content ul {
  list-style: none;
  padding: 0;
}

.about-content ul li {
  padding: 8px 0;
  border-bottom: 1px dashed #e8e8e8;
  color: #555;
  font-size: 15px;
}

.about-content ul li strong {
  color: #1a3a6b;
  display: inline-block;
  width: 100px;
}

/* ===== 联系页面 ===== */
.contact-info {
  background: #fff;
  border-radius: 10px;
  padding: 36px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.contact-info .info-item {
  display: flex;
  align-items: flex-start;
  padding: 16px 0;
  border-bottom: 1px solid #f0f0f0;
}

.contact-info .info-item:last-child {
  border-bottom: none;
}

.contact-info .info-label {
  font-weight: 600;
  color: #1a3a6b;
  min-width: 100px;
}

.contact-info .info-value {
  color: #555;
}

/* ===== 作品详情 ===== */
.works-detail {
  background: #fff;
  border-radius: 10px;
  padding: 36px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
  margin-bottom: 24px;
}

.works-detail h2 {
  color: #1a3a6b;
  font-size: 22px;
  margin-bottom: 8px;
}

.works-detail .meta {
  color: #999;
  font-size: 13px;
  margin-bottom: 16px;
}

.works-detail p {
  color: #555;
  font-size: 15px;
  line-height: 2;
  margin-bottom: 12px;
}

/* ===== 页脚 ===== */
.footer {
  background: #1a2a44;
  color: #aab4c7;
  text-align: center;
  padding: 30px 20px;
  margin-top: 40px;
  font-size: 13px;
  line-height: 2;
}

.footer a {
  color: #7eb8ff;
}

.footer a:hover {
  color: #fff;
}

.footer .divider {
  margin: 0 8px;
  color: #4a5568;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    padding: 10px 20px;
  }

  .nav {
    flex-wrap: wrap;
    justify-content: center;
  }

  .nav li a {
    padding: 10px 14px;
  }

  .banner {
    padding: 50px 20px;
  }

  .banner h1 {
    font-size: 28px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
}