/* 
 * 赢政天下 2.0 - AI世界的中文入口
 * 页头和导航样式表
 * 版本: 2.1.0
 * 日期: 2025-04-03
 */

/* 顶部导航 */
.top-nav {
  background-color: var(--bg-accent);
  border-bottom: 1px solid var(--border-color);
  padding: 8px 0;
  font-size: 14px;
  color: var(--primary);
}

.top-nav-links {
  display: flex;
  justify-content: left;
  flex-wrap: wrap;
  gap: 15px;
}

.top-nav a {
  color: var(--primary);
  padding: 0 5px;
}

.top-nav a:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* 顶部按钮 */
.ai-computing-nav {
  display: inline-flex;
  align-items: center;
  padding: 8px 15px;
  background-color: #ffd700;
  color: #333;
  border-radius: 20px;
  text-decoration: none;
  font-weight: 600;
  margin-left: 10px;
  transition: all 0.3s ease;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  font-size: 14px;
}

.ai-computing-nav i {
  margin-right: 8px;
  font-size: 16px;
}

.ai-computing-nav:hover {
  background-color: #ffcc00;
  transform: translateY(-2px);
  box-shadow: 0 3px 8px rgba(0,0,0,0.15);
}

/* 头部区域 */
header {
  padding: 20px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
}

.logo-area {
  display: flex;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  width: 300px;
  height: 80px;
  object-fit: contain;
}

.logo-text p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 5px;
  font-style: italic;
}

.search-bar {
  flex-grow: 1;
  max-width: 500px;
  margin: 0 20px;
}

.search-form {
  display: flex;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 12px 15px;
  padding-right: 100px;
  border: 2px solid var(--primary);
  border-radius: 24px;
  font-size: 15px;
  outline: none;
  box-shadow: 0 2px 6px rgba(59, 89, 152, 0.1);
  transition: var(--transition-normal);
}

.search-input:focus {
  border-color: var(--primary-dark);
  box-shadow: 0 0 0 3px rgba(59, 89, 152, 0.2);
}

.search-btn {
  position: absolute;
  right: 8px;
  top: 8px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: 20px;
  padding: 8px 20px;
  cursor: pointer;
  font-weight: bold;
  transition: var(--transition-fast);
}

.search-btn:hover {
  background-color: var(--primary-dark);
}

.user-actions {
  display: flex;
  gap: 15px;
}

.user-actions a {
  display: flex;
  align-items: center;
  color: var(--primary);
  font-weight: 500;
  padding: 5px 10px;
  border-radius: var(--border-radius);
  transition: var(--transition-fast);
}

.user-actions a i {
  margin-right: 5px;
}

.user-actions a:hover {
  background-color: var(--bg-accent);
  color: var(--primary-dark);
}

/* 主导航 */
.main-nav {
  background-color: var(--primary);
  color: var(--text-white);
  padding: 12px 0;
  box-shadow: var(--shadow-md);
  position: relative;
  z-index: 100;
}

.nav-links {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px;
}

.nav-links a {
  color: white;
  padding: 8px 12px;
  font-size: 15px;
  border-radius: var(--border-radius);
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  flex: 1;
  text-align: center;
  justify-content: center;
  white-space: nowrap;
  min-width: 100px;
}

.nav-links a i {
  font-size: 16px;
}

.nav-links a:hover {
  background-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

/* 面包屑导航 */
.breadcrumb {
  margin: 20px 0;
  font-size: 14px;
  color: #666;
}

.breadcrumb a {
  color: var(--primary);
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* 响应式调整 */
@media (max-width: 1200px) {
  .nav-links a {
    padding: 8px 10px;
    font-size: 14px;
  }
}

@media (max-width: 992px) {
  .logo img {
    width: 240px;
    height: 64px;
  }
  
  .nav-links {
    justify-content: center;
  }
  
  .nav-links a {
    flex: auto;
  }
}

@media (max-width: 768px) {
  header {
    flex-direction: column;
    gap: 15px;
  }
  
  .search-bar {
    margin: 15px 0;
    width: 100%;
    max-width: none;
  }
  
  .logo-area {
    justify-content: center;
  }
  
  .nav-links {
    flex-wrap: wrap;
  }
  
  .nav-links a {
    min-width: 140px;
  }
}

@media (max-width: 576px) {
  .logo img {
    width: 200px;
    height: 53px;
  }
  
  .nav-links a {
    min-width: 120px;
    font-size: 13px;
  }
}