/* 飞鸟云全局样式 - 浅色动态主题 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --primary: #3b82f6; /* 飞鸟云主题蓝 */
  --primary-hover: #2563eb;
  --secondary: #10b981; /* 成功绿 */
  --background: #f8fafc;
  --surface: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --gradient-bg: linear-gradient(135deg, #f0fdfa 0%, #eff6ff 100%);
  --gradient-text: linear-gradient(to right, #3b82f6, #06b6d4);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-main);
  background: var(--background);
  overflow-x: hidden;
}

body {
  line-height: 1.6;
  position: relative;
}

/* 动态背景点缀 */
.dynamic-bg {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  background: var(--gradient-bg);
  overflow: hidden;
}

.blob {
  position: absolute;
  filter: blur(80px);
  z-index: -1;
  opacity: 0.5;
  animation: float 20s infinite ease-in-out alternate;
}

.blob-1 {
  width: 400px;
  height: 400px;
  background: #bfdbfe;
  top: -100px;
  left: -100px;
}

.blob-2 {
  width: 500px;
  height: 500px;
  background: #a7f3d0;
  bottom: -200px;
  right: -100px;
  animation-delay: -5s;
}

@keyframes float {
  0% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(50px, 50px) scale(1.1); }
  100% { transform: translate(-50px, 100px) scale(0.9); }
}

/* 布局容器 */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 导航栏 */
header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  color: var(--text-main);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
  position: relative;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--primary);
  transition: width 0.3s;
}

.nav-links a:hover::after {
  width: 100%;
}

.btn-cta {
  background: var(--primary);
  color: white;
  padding: 10px 24px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.39);
  display: inline-block;
}

.btn-cta:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

/* 响应式导航栏菜单按钮 */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--text-main);
  cursor: pointer;
}

/* Hero区域 */
.hero {
  padding: 160px 0 100px;
  text-align: center;
}

.hero h1 {
  font-size: 56px;
  font-weight: 800;
  margin-bottom: 24px;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.hero p {
  font-size: 20px;
  color: var(--text-muted);
  max-width: 700px;
  margin: 0 auto 40px;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 16px;
}

.btn-outline {
  background: transparent;
  color: var(--text-main);
  border: 2px solid var(--border);
  padding: 10px 24px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
}

/* 通用板块样式 */
section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header h2 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 16px;
}

.section-header p {
  font-size: 18px;
  color: var(--text-muted);
}

/* 核心优势 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--surface);
  padding: 40px;
  border-radius: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: #bfdbfe;
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: #eff6ff;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  color: var(--primary);
  margin-bottom: 24px;
}

.feature-card h3 {
  font-size: 22px;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-muted);
}

/* 节点状态 */
.status-board {
  background: var(--surface);
  border-radius: 24px;
  padding: 40px;
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
}

.status-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.status-row:last-child {
  border-bottom: none;
}

.node-info {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 500;
}

.flag {
  font-size: 24px;
}

.latency {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: monospace;
  font-size: 16px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--secondary);
}

.dot.yellow { background: #f59e0b; }

/* 套餐价格 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
  align-items: center;
}

.pricing-card {
  background: var(--surface);
  border-radius: 24px;
  padding: 40px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  transition: all 0.3s ease;
  position: relative;
}

.pricing-card.popular {
  border: 2px solid var(--primary);
  transform: scale(1.05);
  box-shadow: var(--shadow-lg);
}

.popular-badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--gradient-text);
  color: white;
  padding: 4px 16px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
}

.pricing-card h3 {
  font-size: 24px;
  margin-bottom: 8px;
}

.price {
  font-size: 48px;
  font-weight: 800;
  margin-bottom: 24px;
  color: var(--text-main);
}

.price span {
  font-size: 18px;
  color: var(--text-muted);
  font-weight: 400;
}

.features-list {
  list-style: none;
  margin-bottom: 32px;
}

.features-list li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 12px;
}

.features-list li i {
  color: var(--primary);
}

/* 用户评价 */
.reviews-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 32px;
}

.review-card {
  background: var(--surface);
  padding: 32px;
  border-radius: 24px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
}

.stars {
  color: #f59e0b;
  margin-bottom: 16px;
  font-size: 18px;
}

.review-text {
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.reviewer {
  display: flex;
  align-items: center;
  gap: 16px;
}

.avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #e2e8f0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  color: var(--text-muted);
}

/* 常见问题 */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  margin-bottom: 16px;
  overflow: hidden;
}

.faq-question {
  padding: 24px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  font-size: 18px;
  user-select: none;
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
  color: var(--text-muted);
}

.faq-item.active .faq-answer {
  padding: 0 24px 24px;
  max-height: 200px; /* 足够显示内容的高度 */
}

.faq-item.active .faq-question i {
  transform: rotate(180deg);
}

.faq-question i {
  transition: transform 0.3s ease;
  color: var(--text-muted);
}

/* 知识库 */
.kb-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.kb-card {
  background: var(--surface);
  border-radius: 16px;
  padding: 24px;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
  display: block;
  text-decoration: none;
  color: inherit;
}

.kb-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.kb-date {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 8px;
  display: block;
}

.kb-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--primary);
}

.kb-card p {
  color: var(--text-muted);
  font-size: 14px;
}

/* 页脚 */
footer {
  background: #1e293b;
  color: white;
  padding: 64px 0 32px;
}

.footer-content {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand h2 {
  font-size: 24px;
  margin-bottom: 16px;
  color: white;
}

.footer-brand p {
  color: #94a3b8;
  max-width: 300px;
}

.footer-links h3 {
  margin-bottom: 24px;
  font-size: 18px;
}

.footer-links ul {
  list-style: none;
}

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

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid #334155;
  padding-top: 32px;
  text-align: center;
  color: #94a3b8;
}

/* 响应式调整 */
@media (max-width: 768px) {
  .nav-links {
    display: none; /* 简化的移动端菜单 */
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background: var(--surface);
    flex-direction: column;
    padding: 24px;
    box-shadow: var(--shadow-md);
    gap: 16px;
  }
  
  .nav-links.active {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .hero h1 {
    font-size: 40px;
  }
  
  .pricing-card.popular {
    transform: none;
  }
}