/* 全局样式 */
body { 
  font-family: 'Roboto', 'PingFang SC', 'Microsoft YaHei', Arial, sans-serif; 
  margin: 0; 
  background: #f7f9fb; 
  color: #222; 
}

/* 语言选择栏 */
.lang-bar {
  background: #1e2a78;
  color: #fff;
  text-align: center;
  padding: 8px 0;
}

.lang-bar a {
  color: #fff;
  margin: 0 5px;
  text-decoration: none;
}

/* 页面头部 */
header {
  background: linear-gradient(90deg, #1e2a78 0%, #2e8bfa 100%);
  color: #fff;
  padding: 40px 0 30px 0;
  text-align: center;
}

header h1 {
  font-size: 2.6rem;
  margin: 0 0 10px 0;
}

header p {
  font-size: 1.2rem;
  margin: 0 0 18px 0;
}

/* 导航栏 */
nav {
  background: #fff;
  box-shadow: 0 2px 8px rgba(30,42,120,0.06);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all 0.3s ease;
}

nav.scrolled {
  box-shadow: 0 4px 12px rgba(30,42,120,0.1);
}

nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

nav li {
  margin: 0 22px;
}

nav a {
  color: #1e2a78;
  text-decoration: none;
  font-weight: 500;
  font-size: 1.08rem;
  padding: 18px 0;
  display: block;
  transition: color 0.2s;
}

nav a:hover {
  color: #2e8bfa;
}

/* 主要内容容器 */
.container {
  max-width: 1100px;
  margin: 30px auto;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 4px 24px rgba(30,42,120,0.08);
  padding: 36px 32px;
}

/* 内容区块 */
.content-section {
  margin-bottom: 40px;
}

.section-title {
  font-size: 1.7rem;
  color: #1e2a78;
  margin-bottom: 18px;
  font-weight: 700;
}

/* 按钮样式 */
.cta-btn {
  background: #ffb300;
  color: #222;
  font-weight: bold;
  padding: 14px 38px;
  border: none;
  border-radius: 30px;
  font-size: 1.2rem;
  cursor: pointer;
  transition: background 0.2s;
  margin-top: 10px;
}

.cta-btn:hover {
  background: #ffd54f;
}

/* 页脚 */
.footer {
  background: #1e2a78;
  color: #fff;
  text-align: center;
  padding: 28px 0 18px 0;
  border-radius: 0 0 16px 16px;
  margin-top: 40px;
}

/* 响应式设计 */
@media (max-width: 900px) {
  .container {
    padding: 18px 6px;
  }
  
  nav ul {
    flex-wrap: wrap;
  }
  
  nav li {
    margin: 0 10px;
  }
  
  nav a {
    font-size: 0.95rem;
    padding: 12px 0;
  }
  
  header h1 {
    font-size: 2rem;
  }
  
  header p {
    font-size: 1rem;
  }
}

/* 标签样式 */
.tag {
  display: inline-block;
  background: #e3f2fd;
  color: #1e2a78;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.9rem;
  margin: 4px;
}

/* 复制按钮 */
.copy-btn {
  background: #2e8bfa;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 6px 18px;
  margin-left: 16px;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.2s;
}

.copy-btn:hover {
  background: #1e2a78;
}

/* 用户案例样式 */
.user-case {
  background: #f2f6ff;
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 2px 8px rgba(46,139,250,0.04);
}

.user-profile {
  margin-bottom: 16px;
}

.user-profile h3 {
  color: #1e2a78;
  margin: 0 0 8px 0;
}

.case-content {
  color: #444;
  line-height: 1.6;
}

.case-content h4 {
  color: #2e8bfa;
  margin: 16px 0 8px 0;
}

/* 新币分析样式 */
.coin-analysis {
  background: #f2f6ff;
  border-radius: 12px;
  padding: 24px;
  margin-bottom: 24px;
  box-shadow: 0 2px 8px rgba(46,139,250,0.04);
}

.coin-header {
  margin-bottom: 16px;
}

.coin-header h3 {
  color: #1e2a78;
  margin: 0 0 8px 0;
}

.analysis-content {
  color: #444;
  line-height: 1.6;
}

.analysis-content h4 {
  color: #2e8bfa;
  margin: 16px 0 8px 0;
}

/* 返回顶部按钮 */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: #1e2a78;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(30,42,120,0.2);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: #2e8bfa;
  transform: translateY(-3px);
}

/* 移动端优化 */
@media (max-width: 768px) {
  .container {
    padding: 20px 15px;
    margin: 15px;
  }

  header {
    padding: 30px 15px;
  }

  header h1 {
    font-size: 1.8rem;
  }

  header p {
    font-size: 1rem;
  }

  nav {
    padding: 0;
  }

  nav ul {
    flex-direction: column;
    padding: 10px 0;
  }

  nav li {
    margin: 0;
    border-bottom: 1px solid rgba(30,42,120,0.1);
  }

  nav a {
    padding: 12px 20px;
    font-size: 1rem;
  }

  .features, .steps {
    gap: 15px;
  }

  .feature, .step {
    padding: 15px;
  }

  .promo-code {
    padding: 15px;
    font-size: 1.1rem;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }

  .lang-bar {
    padding: 8px 5px;
    font-size: 0.9rem;
  }

  .lang-bar a {
    margin: 0 3px;
  }
}

/* 平板设备优化 */
@media (min-width: 769px) and (max-width: 1024px) {
  .container {
    padding: 25px 20px;
    margin: 20px;
  }

  header h1 {
    font-size: 2.2rem;
  }

  nav li {
    margin: 0 15px;
  }

  .features, .steps {
    gap: 20px;
  }
}

/* 动画效果 */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.feature, .step {
  animation: fadeIn 0.5s ease-out;
}

/* 加载动画 */
.loading {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255,255,255,0.9);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.loading-spinner {
  width: 50px;
  height: 50px;
  border: 5px solid #f3f3f3;
  border-top: 5px solid #1e2a78;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
  body {
    background: #1a1a1a;
    color: #fff;
  }

  .container {
    background: #2d2d2d;
    box-shadow: 0 4px 24px rgba(0,0,0,0.2);
  }

  .feature {
    background: #3d3d3d;
  }

  .step {
    background: #3d3d3d;
  }

  .promo-code {
    background: #3d3d3d;
  }

  nav {
    background: #2d2d2d;
  }

  .back-to-top {
    background: #2e8bfa;
  }
}