/* 
 * 赢政天下 2.0 - AI世界的中文入口
 * 头部样式表 (2/4)
 * 版本: 2.0.0
 * 日期: 2025-04-01
 */

/* 全局变量与重置 */
:root {
  /* 颜色变量 */
  --primary: #3b5998;
  --primary-dark: #1f3e75;
  --primary-light: #6381c1;
  --secondary: #cb9b52;
  --secondary-dark: #b8860b;
  --secondary-light: #ffd180;
  --success: #4caf50;
  --info: #2196f3;
  --warning: #ff9800;
  --danger: #f44336;
  --dark: #303846;
  
  /* 背景色 */
  --bg-primary: #f5f7fa;
  --bg-light: #f8f9fa;
  --bg-accent: #e6effe;
  
  /* 文本色 */
  --text-primary: #333;
  --text-secondary: #666;
  --text-light: #888;
  --text-white: #fff;
  
  /* 边框 */
  --border-color: #e6effe;
  --border-radius: 8px;
  
  /* 阴影 */
  --shadow-sm: 0 2px 5px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 10px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 5px 20px rgba(0, 0, 0, 0.15);
  
  /* 过渡效果 */
  --transition-fast: all 0.2s ease;
  --transition-normal: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition-normal);
}

ul, ol {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
}

/* 布局容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 15px;
  width: 100%;
}

main {
  padding: 20px 0 40px;
}

section {
  margin-bottom: 40px;
}

/* 通用标题样式 */
.section-title {
  text-align: center;
  margin-bottom: 30px;
  position: relative;
}

.section-title .title-text {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary-dark);
  position: relative;
  display: inline-block;
  margin-bottom: 10px;
}

.section-title .title-text::after {
  content: "";
  display: block;
  width: 80px;
  height: 3px;
  background-color: var(--secondary);
  margin: 15px auto 0;
}

.section-title .title-desc {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto;
}

.section-title .title-desc strong {
  color: var(--primary-dark);
}

.view-all {
  position: absolute;
  right: 0;
  top: 10px;
  font-size: 15px;
  color: var(--primary);
  font-weight: 600;
  display: flex;
  align-items: center;
}

.view-all:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* 按钮样式 */
.primary-btn, .secondary-btn {
  display: inline-block;
  padding: 12px 25px;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 15px;
  transition: var(--transition-fast);
  text-align: center;
}

.primary-btn {
  background-color: var(--primary);
  color: white;
}

.primary-btn:hover {
  background-color: var(--primary-dark);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.secondary-btn {
  background-color: var(--bg-accent);
  color: var(--primary);
  border: 1px solid var(--primary-light);
}

.secondary-btn:hover {
  background-color: var(--primary-light);
  color: white;
  transform: translateY(-3px);
}


/* 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;
}

/* 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);
}

/* 首页横幅 */
.hero-banner {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
  color: var(--text-white);
  padding: 50px 0;
  margin-bottom: 40px;
  border-radius: 10px;
  overflow: hidden;
}

.hero-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

.hero-content {
  flex: 1;
}

.hero-content h1 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: 15px;
  line-height: 1.2;
}

.hero-tagline {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--secondary-light);
}

.hero-description {
  font-size: 18px;
  line-height: 1.6;
  margin-bottom: 30px;
  max-width: 600px;
}

.hero-description strong {
  color: var(--secondary-light);
}

.hero-buttons {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
}

.hero-image {
  flex: 1;
  max-width: 500px;
}

.hero-image img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}



/* 订阅与连接区域 */
.connect-section {
  background-color: var(--bg-light);
  padding: 40px 0;
  border-top: 1px solid var(--border-color);
  margin-top: 60px;
}

.connect-inner {
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
}

.newsletter-block, .community-block {
  flex: 1;
  min-width: 300px;
  background-color: white;
  padding: 25px;
  border-radius: 12px;
  box-shadow: var(--shadow-md);
}

.newsletter-block h3, .community-block h3 {
  font-size: 20px;
  color: var(--primary-dark);
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.newsletter-block p, .community-block p {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.newsletter-form {
  display: flex;
  gap: 10px;
}

.newsletter-form input {
  flex: 1;
  padding: 12px 15px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 14px;
  outline: none;
}

.newsletter-form button {
  background-color: var(--primary);
  color: white;
  padding: 12px 20px;
  border: none;
  border-radius: var(--border-radius);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-fast);
}

.newsletter-form button:hover {
  background-color: var(--primary-dark);
}

.community-buttons {
  display: flex;
  gap: 15px;
}

/* 页脚 */
footer {
  background-color: var(--dark);
  color: #ccc;
  padding: 60px 0 20px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-bottom: 30px;
}

.footer-column h3 {
  color: white;
  margin-bottom: 20px;
  font-size: 18px;
  font-weight: 600;
}

.footer-column ul li {
  margin-bottom: 12px;
}

.footer-column a {
  color: #ccc;
  font-size: 14px;
  transition: var(--transition-fast);
}

.footer-column a:hover {
  color: white;
  text-decoration: underline;
}

.social-links a {
  display: flex;
  align-items: center;
  gap: 8px;
}

.social-links i {
  font-size: 16px;
  width: 20px;
  text-align: center;
}

.brand-motto {
  text-align: center;
  padding: 30px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: 20px;
}

.motto-text {
  font-size: 20px;
  color: var(--secondary-light);
  margin-bottom: 10px;
  font-weight: 600;
}

.motto-description {
  font-size: 14px;
  color: #aaa;
  font-style: italic;
}

.copyright {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 14px;
}

.vintage-note {
  margin-top: 10px;
  font-style: italic;
  color: #aaa;
  font-size: 13px;
}

/* 响应式调整 */
@media (max-width: 1200px) {
  .tool-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .nav-links a {
    padding: 8px 10px;
    font-size: 14px;
  }
}

@media (max-width: 992px) {
  .tool-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .blocks-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .news-container {
    flex-direction: column;
  }
  
  .logo img {
    width: 240px;
    height: 64px;
  }
  
  .nav-links {
    justify-content: center;
  }
  
  .nav-links a {
    flex: auto;
  }
  
  .connect-inner {
    flex-direction: column;
  }
}

@media (max-width: 768px) {
  header {
    flex-direction: column;
    gap: 15px;
  }
  
  .search-bar {
    margin: 15px 0;
    width: 100%;
    max-width: none;
  }
  
  .hero-container {
    flex-direction: column;
  }
  
  .hero-content {
    text-align: center;
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .logo-area {
    justify-content: center;
  }
  
  .nav-links {
    flex-wrap: wrap;
  }
  
  .nav-links a {
    min-width: 140px;
  }
  
  .blocks-grid {
    grid-template-columns: 1fr;
  }
  
  .tool-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .logo img {
    width: 200px;
    height: 53px;
  }
  
  .hero-content h1 {
    font-size: 28px;
  }
  
  .hero-tagline {
    font-size: 18px;
  }
  
  .section-title .title-text {
    font-size: 24px;
  }
  
  .section-title .title-desc {
    font-size: 16px;
  }
  
  .nav-links a {
    min-width: 120px;
    font-size: 13px;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
  }
  
  .motto-text {
    font-size: 18px;
  }
  
  .block-card {
    padding: 20px;
  }
  
  .legacy-title {
    font-size: 20px;
  }
  
  .legacy-text {
    font-size: 15px;
  }
  
  .connect-section {
    padding: 30px 0;
  }
  
  .newsletter-block, .community-block {
    padding: 20px;
  }
  
  .newsletter-form {
    flex-direction: column;
  }
  
  .newsletter-form button {
    width: 100%;
    margin-top: 10px;
  }
  
  .community-buttons {
    flex-direction: column;
  }
  
  .community-buttons a {
    width: 100%;
    text-align: center;
  }
  
  .tab-headers {
    flex-wrap: wrap;
  }
  
  .tab-btn {
    padding: 10px;
    font-size: 14px;
  }
  
  .tab-content {
    padding: 20px 15px;
  }
}

/* 顶部按钮 */
.ai-computing-nav {
    display: inline-flex;
    align-items: center;
    padding: 8px 15px;
    background-color: #ffd700; /* 黄色底色 */
    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; /* 悬浮时略微变深的黄色 */
    transform: translateY(-2px);
    box-shadow: 0 3px 8px rgba(0,0,0,0.15);
}