/* ********** 1. 全局CSS变量（品牌色/通用样式）********** */
:root {
  /* 品牌主色 */
  --trust-blue: #007AFF;
  --trust-dark: #1A1A1A;
  --trust-gray: #666666;
  --trust-light: #F5F7FA;
  --trust-white: #FFFFFF;
  --trust-border: #E5E7EB;
  
  /* 通用尺寸 */
  --container-width: 1200px;
  --gap: 20px;
  
  /* 字体 */
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ********** 2. 基础样式重置 ********** */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-main);
  color: var(--trust-dark);
  background-color: var(--trust-white);
  line-height: 1.6;
}

ul, li {
  list-style: none;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease;
}

img {
  max-width: 100%;
  display: block;
}

/* ********** 3. 通用样式（容器/按钮/板块标题）********** */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* 通用按钮样式 */
.btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--trust-blue);
  color: var(--trust-white);
  border-radius: 8px;
  font-weight: 600;
  font-size: 16px;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease;
}
.btn:hover {
  background-color: #0056CC;
}
.btn-outline {
  background-color: transparent;
  color: var(--trust-blue);
  border: 1px solid var(--trust-blue);
}
.btn-outline:hover {
  background-color: #E8F4FF;
}

/* 通用板块标题 */
.section {
  padding: 80px 0;
}
.section-title {
  font-size: 32px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
}
.section-desc {
  font-size: 18px;
  color: var(--trust-gray);
  text-align: center;
  max-width: 800px;
  margin: 0 auto 60px;
}

/* ********** 4. 头部导航样式 ********** */
.header {
  padding: 20px 0;
  border-bottom: 1px solid var(--trust-border);
  background-color: var(--trust-white);
  position: sticky;
  top: 0;
  z-index: 999;
}
.header-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo img {
  height: 40px;
  width: auto;
}
.logo-text {
  font-size: 20px;
  font-weight: 700;
  color: var(--trust-dark);
}

/* 导航菜单 */
.nav-list {
  display: flex;
  gap: 30px;
}
.nav-link {
  font-size: 16px;
  font-weight: 500;
  color: var(--trust-gray);
}
.nav-link:hover, .nav-link.active {
  color: var(--trust-blue);
}

/* 移动端导航按钮（默认隐藏） */
.mobile-nav-btn {
  font-size: 24px;
  cursor: pointer;
  display: none;
}

/* ********** 5. 英雄区样式（左文右图定型）********** */
.hero {
  background: linear-gradient(135deg, var(--trust-light) 0%, #E8F4FF 100%);
  padding: 80px 0;
  overflow: hidden;
}
.hero-wrap {
  display: flex;
  align-items: center;
  gap: 60px;
  flex-wrap: wrap;
  justify-content: flex-start; /* 强制左对齐，确保文字在左 */
}
.hero-content {
  flex: 1;
  min-width: 300px;
  order: 1; /* 强制文字排第一列 */
}
.hero-img {
  flex: 1;
  min-width: 300px;
  text-align: center;
  order: 2; /* 强制图片排第二列 */
}
.hero-img img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 122, 255, 0.15); /* 加轻微阴影，提升质感 */
}
.hero-title {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 20px;
  line-height: 1.2;
}
.hero-title span {
  color: var(--trust-blue);
}
.hero-desc {
  font-size: 20px;
  color: var(--trust-gray);
  max-width: 600px;
  margin: 0 0 40px 0;
  line-height: 1.7;
}
.hero-btns {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

/* ********** 6. 核心功能板块样式 ********** */
.features-wrap {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}
.feature-card {
  background-color: var(--trust-white);
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  text-align: center;
  transition: transform 0.2s ease;
}
.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 20px rgba(0, 122, 255, 0.1);
}
.feature-card img {
  height: 80px;
  width: auto;
  margin: 0 auto 20px;
}
.feature-card-title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 12px;
}
.feature-card-desc {
  color: var(--trust-gray);
  font-size: 14px;
  line-height: 1.6;
}

/* ********** 7. 安全板块样式 ********** */
.security-wrap {
  display: flex;
  align-items: center;
  gap: 60px;
  flex-wrap: wrap;
}
.security-img {
  flex: 1;
  min-width: 300px;
}
.security-img img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}
.security-content {
  flex: 1;
  min-width: 300px;
}
.security-content h3 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 20px;
}
.security-content p {
  font-size: 16px;
  color: var(--trust-gray);
  margin-bottom: 20px;
  line-height: 1.7;
}
.security-list {
  margin-bottom: 30px;
}
.security-list li {
  font-size: 16px;
  color: var(--trust-dark);
  margin-bottom: 10px;
  position: relative;
  padding-left: 24px;
}
.security-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--trust-blue);
  font-weight: 700;
}

/* ********** 8. 首页新闻方格板块样式 ********** */
.home-news {
  padding: 100px 0;
  background-color: var(--trust-light); /* 浅灰背景，突出白色方格卡片 */
}
.home-news-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 50px;
  padding: 0 10px;
}
.home-news-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--trust-dark);
  margin: 0;
}
.home-news-more {
  color: var(--trust-blue);
  font-weight: 600;
  font-size: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 8px;
  transition: background-color 0.2s ease;
}
.home-news-more:hover {
  color: #0056CC;
  background-color: #e8f4ff;
}
/* 关键：3列等宽方格布局，强制每列宽度一致 */
.home-news-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px; /* 方格间距 */
}
/* 新闻方格卡片：统一尺寸、白色背景 */
.home-news-card {
  background-color: #FFFFFF;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: all 0.2s ease;
  height: 100%; /* 强制卡片高度一致 */
  display: flex;
  flex-direction: column;
}
.home-news-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 8px 20px rgba(0, 122, 255, 0.1);
}
/* 方格内图片：固定高度 */
.home-news-card-img {
  width: 100%;
  height: 190px; /* 固定高度，保证方格统一 */
  object-fit: cover; /* 图片裁剪，不拉伸 */
}
.home-news-card-content {
  padding: 22px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.home-news-card-date {
  font-size: 14px;
  color: var(--trust-gray);
  margin-bottom: 12px;
}
.home-news-card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.4;
  color: var(--trust-dark);
  flex: 1;
}
.home-news-card-desc {
  color: var(--trust-gray);
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
}

/* ********** 9. 底部样式 ********** */
.footer {
  background-color: var(--trust-dark);
  color: var(--trust-white);
  padding: 80px 0 40px;
}
.footer-wrap {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}
.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}
.footer-logo img {
  height: 40px;
  width: auto;
}
.footer-logo-text {
  font-size: 20px;
  font-weight: 700;
}
.footer-desc {
  color: #CCCCCC;
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 20px;
}
.footer-social {
  display: flex;
  gap: 16px;
}
.footer-social a {
  font-size: 20px;
  color: #CCCCCC;
  transition: color 0.2s ease;
}
.footer-social a:hover {
  color: var(--trust-blue);
}
.footer-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
}
.footer-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-link {
  color: #CCCCCC;
  font-size: 14px;
  transition: color 0.2s ease;
}
.footer-link:hover {
  color: var(--trust-blue);
}
.footer-copyright {
  text-align: center;
  color: #999999;
  font-size: 14px;
  padding-top: 20px;
  border-top: 1px solid #333333;
}

/* ********** 10. 其他页面通用样式（关于/安全/新闻/帮助）********** */
/* 关于页面样式 */
.about-wrap {
  display: flex;
  align-items: center;
  gap: 60px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}
.about-img {
  flex: 1;
  min-width: 300px;
}
.about-img img {
  max-width: 100%;
  height: auto;
  border-radius: 12px;
}
.about-content {
  flex: 1;
  min-width: 300px;
}
.about-content h3 {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 20px;
}
.about-content p {
  font-size: 16px;
  color: var(--trust-gray);
  margin-bottom: 16px;
  line-height: 1.7;
}
.about-info {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 30px;
}
.about-info-item h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 12px;
}
.about-info-desc {
  color: var(--trust-gray);
  font-size: 14px;
  margin-bottom: 8px;
}

/* 新闻页面样式 */
.news-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 40px;
}
.news-card {
  background-color: var(--trust-white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
  transition: transform 0.2s ease;
}
.news-card:hover {
  transform: translateY(-5px);
}
.news-card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.news-card-content {
  padding: 20px;
}
.news-card-date {
  font-size: 14px;
  color: var(--trust-gray);
  margin-bottom: 10px;
}
.news-card-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}
.news-card-desc {
  color: var(--trust-gray);
  font-size: 14px;
  margin-bottom: 16px;
}
.news-card-link {
  color: var(--trust-blue);
  font-weight: 500;
  font-size: 14px;
}
.news-card-link:hover {
  text-decoration: underline;
}

/* 帮助中心样式 */
.help-search {
  max-width: 600px;
  margin: 0 auto 40px;
  position: relative;
}
.help-search input {
  width: 100%;
  padding: 16px 20px;
  border-radius: 8px;
  border: 1px solid var(--trust-border);
  font-size: 16px;
}
.help-search button {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  font-size: 20px;
  color: var(--trust-blue);
  cursor: pointer;
}
.help-categories {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 40px;
}
.help-category {
  background-color: var(--trust-light);
  padding: 20px;
  border-radius: 8px;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.2s ease;
}
.help-category:hover {
  background-color: #E8F4FF;
}
.help-category i {
  font-size: 32px;
  color: var(--trust-blue);
  margin-bottom: 12px;
}
.help-category h3 {
  font-size: 16px;
  font-weight: 600;
}
.help-faq {
  max-width: 800px;
  margin: 0 auto;
}
.help-faq-item {
  border-bottom: 1px solid var(--trust-border);
  padding: 20px 0;
}
.help-faq-question {
  font-size: 18px;
  font-weight: 600;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}
.help-faq-answer {
  margin-top: 12px;
  color: var(--trust-gray);
  font-size: 16px;
  display: none;
}
.help-faq-answer.active {
  display: block;
}

/* ********** 11. 响应式适配（移动端/平板）********** */
/* 平板（992px以下） */
@media (max-width: 992px) {
  .features-wrap {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-wrap {
    grid-template-columns: 2fr 1fr 1fr;
  }
  .help-categories {
    grid-template-columns: repeat(2, 1fr);
  }
  .home-news-list {
    grid-template-columns: repeat(2, 1fr); /* 平板2列方格 */
  }
  .hero-title {
    font-size: 36px;
  }
  .news-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 移动端（768px以下） */
@media (max-width: 768px) {
  /* 导航隐藏，显示移动端按钮 */
  .nav {
    display: none;
  }
  .mobile-nav-btn {
    display: block;
  }
  /* 通用样式适配 */
  .section {
    padding: 60px 0;
  }
  .section-title {
    font-size: 24px;
  }
  .section-desc {
    font-size: 16px;
  }
  /* 英雄区适配 */
  .hero {
    padding: 60px 0;
  }
  .hero-wrap {
    gap: 40px;
  }
  .hero-title {
    font-size: 28px;
  }
  .hero-desc {
    font-size: 16px;
  }
  .hero-img img {
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.1);
  }
  /* 功能板块适配 */
  .features-wrap {
    grid-template-columns: 1fr;
  }
  /* 安全板块适配 */
  .security-wrap {
    gap: 40px;
  }
  /* 新闻方格适配 */
  .home-news {
    padding: 60px 0;
  }
  .home-news-title {
    font-size: 24px;
  }
  .home-news-list {
    grid-template-columns: 1fr; /* 移动端1列方格 */
  }
  /* 底部适配 */
  .footer-wrap {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  /* 其他页面适配 */
  .about-info {
    grid-template-columns: 1fr;
  }
  .news-list {
    grid-template-columns: 1fr;
  }
  .help-categories {
    grid-template-columns: 1fr;
  }
}