/**
 * x402 Data Service - Binance Style
 * 币安风格设计：深色主题 + 金色强调
 */

/* ========== 基础设置 ========== */
:root {
  /* 币安配色 */
  --primary-gold: #F0B90B;
  --primary-gold-hover: #FCD535;
  --dark-bg: #0B0E11;
  --darker-bg: #000000;
  --card-bg: #181A20;
  --border-color: #2B3139;
  --text-primary: #EAECEF;
  --text-secondary: #B7BDC6;
  --text-muted: #848E9C;

  /* 字体 */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* 间距 */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 40px;
  --spacing-xl: 64px;

  /* 圆角 */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
}

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

body {
  font-family: var(--font-main);
  background: var(--dark-bg);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ========== 导航栏 ========== */
.navbar {
  background: var(--darker-bg);
  border-bottom: 1px solid var(--border-color);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
}

.logo {
  font-size: 32px;
}

.nav-menu {
  display: flex;
  list-style: none;
  align-items: center;
  gap: var(--spacing-md);
}

.nav-menu a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  transition: color 0.2s;
}

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

.lang-switcher {
  display: flex;
  gap: var(--spacing-xs);
}

.lang-btn {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 12px;
  transition: all 0.2s;
}

.lang-btn:hover,
.lang-btn.active {
  background: var(--primary-gold);
  color: var(--darker-bg);
  border-color: var(--primary-gold);
}

/* ========== Hero 区域 ========== */
.hero {
  padding: var(--spacing-xl) 0 80px;
  background: linear-gradient(180deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
  text-align: center;
}

.hero-title {
  font-size: 48px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

.gradient-text {
  background: linear-gradient(90deg, var(--primary-gold) 0%, #FCD535 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-bottom: var(--spacing-xl);
}

.btn-primary {
  background: var(--primary-gold);
  color: var(--darker-bg);
  padding: 16px 40px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  background: var(--primary-gold-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(240, 185, 11, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  padding: 16px 40px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  border: 2px solid var(--border-color);
  transition: all 0.3s;
  cursor: pointer;
}

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

.btn-outline {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 20px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  border: 1px solid var(--border-color);
  transition: all 0.2s;
}

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

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.stat {
  text-align: center;
}

.stat-value {
  font-size: 40px;
  font-weight: 800;
  color: var(--primary-gold);
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ========== x402scan Demo ========== */
.x402-demo {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-md);
  background: linear-gradient(135deg, rgba(240, 185, 11, 0.05) 0%, rgba(252, 213, 53, 0.02) 100%);
  border: 1px solid rgba(240, 185, 11, 0.2);
  border-radius: var(--radius-lg);
  text-align: center;
}

.demo-label {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.demo-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--primary-gold);
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  transition: all 0.3s;
  padding: 8px 16px;
  border-radius: var(--radius-md);
}

.demo-link:hover {
  color: var(--primary-gold-hover);
  transform: translateX(4px);
}

/* ========== 功能特性 ========== */
.features {
  padding: var(--spacing-xl) 0;
  background: var(--dark-bg);
}

.section-title {
  font-size: 36px;
  font-weight: 800;
  text-align: center;
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 16px;
  margin-bottom: var(--spacing-lg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all 0.3s;
  cursor: pointer;
}

.feature-card:hover {
  border-color: var(--primary-gold);
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(240, 185, 11, 0.1);
}

.feature-icon {
  font-size: 40px;
  margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.6;
  margin-bottom: var(--spacing-sm);
}

.feature-price {
  display: inline-block;
  background: rgba(240, 185, 11, 0.1);
  color: var(--primary-gold);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
}

/* ========== 定价表 ========== */
.pricing {
  padding: var(--spacing-xl) 0;
  background: var(--darker-bg);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.pricing-card {
  background: var(--card-bg);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all 0.3s;
}

.pricing-card.featured {
  border-color: var(--primary-gold);
  position: relative;
}

.pricing-card.featured::before {
  content: 'POPULAR';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gold);
  color: var(--darker-bg);
  padding: 4px 16px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 700;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
}

.pricing-name {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.pricing-price {
  font-size: 40px;
  font-weight: 800;
  color: var(--primary-gold);
  margin-bottom: var(--spacing-xs);
}

.pricing-period {
  color: var(--text-muted);
  font-size: 13px;
  margin-bottom: var(--spacing-md);
}

.pricing-features {
  list-style: none;
  margin-bottom: var(--spacing-md);
  text-align: left;
}

.pricing-features li {
  padding: var(--spacing-xs) 0;
  color: var(--text-secondary);
  font-size: 14px;
}

.pricing-features li::before {
  content: '✓';
  color: var(--primary-gold);
  font-weight: 700;
  margin-right: var(--spacing-xs);
}

/* ========== API 文档 ========== */
.api-docs {
  padding: var(--spacing-xl) 0;
  background: var(--dark-bg);
}

.api-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.api-endpoint {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
}

.api-method {
  display: inline-block;
  background: #10B981;
  color: white;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 700;
  margin-right: var(--spacing-sm);
}

.api-path {
  color: var(--primary-gold);
  font-family: 'Monaco', monospace;
  font-size: 14px;
}

.api-desc {
  color: var(--text-secondary);
  font-size: 14px;
  margin-top: var(--spacing-sm);
}

/* ========== Footer ========== */
.footer {
  background: var(--darker-bg);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-section h4 {
  color: var(--text-primary);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.footer-section p,
.footer-section a {
  color: var(--text-muted);
  font-size: 14px;
  text-decoration: none;
  display: block;
  margin-bottom: var(--spacing-xs);
}

.footer-section a:hover {
  color: var(--primary-gold);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
}

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

/* ========== 快速开始 ========== */
.quickstart {
  padding: var(--spacing-xl) 0;
  background: var(--darker-bg);
}

.steps {
  max-width: 900px;
  margin: var(--spacing-lg) auto 0;
}

.step {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary-gold) 0%, #FCD535 100%);
  color: var(--darker-bg);
  font-size: 24px;
  font-weight: 800;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-content h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.step-content pre {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  overflow-x: auto;
}

.step-content code {
  color: var(--primary-gold);
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.6;
}

/* ========== 网络支持 ========== */
.networks {
  padding: var(--spacing-xl) 0;
  background: var(--dark-bg);
}

.networks-grid {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
  flex-wrap: wrap;
}

.network-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  text-align: center;
  min-width: 150px;
  transition: all 0.3s;
}

.network-card:hover {
  border-color: var(--primary-gold);
  transform: translateY(-4px);
}

.network-icon {
  font-size: 40px;
  margin-bottom: var(--spacing-sm);
}

.network-card h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

/* ========== CTA 区域 ========== */
.cta {
  padding: var(--spacing-xl) 0;
  background: linear-gradient(135deg, rgba(240, 185, 11, 0.1) 0%, rgba(252, 213, 53, 0.05) 100%);
  text-align: center;
}

.cta h2 {
  font-size: 36px;
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.cta p {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
}

.btn-primary.large,
.btn-secondary.large {
  padding: 20px 48px;
  font-size: 18px;
}

/* ========== API Cards ========== */
.api-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.api-card h3 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.api-card p {
  color: var(--text-secondary);
  font-size: 14px;
  margin-bottom: var(--spacing-sm);
}

.api-card pre {
  background: var(--darker-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: var(--spacing-sm);
  overflow-x: auto;
}

.api-card code {
  color: var(--primary-gold);
  font-family: 'Monaco', 'Courier New', monospace;
  font-size: 13px;
  line-height: 1.6;
}

.api-cta {
  text-align: center;
  margin-top: var(--spacing-lg);
}

/* ========== Pricing Badge ========== */
.pricing-card.popular {
  position: relative;
}

.popular-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary-gold);
  color: var(--darker-bg);
  padding: 4px 16px;
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.pricing-tier {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.pricing-price {
  margin: var(--spacing-md) 0;
}

.price {
  font-size: 40px;
  font-weight: 800;
  color: var(--primary-gold);
}

.period {
  color: var(--text-muted);
  font-size: 13px;
}

.btn-pricing {
  display: block;
  width: 100%;
  padding: 12px;
  background: transparent;
  border: 2px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: 600;
  text-align: center;
  transition: all 0.3s;
}

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

.btn-pricing.primary {
  background: var(--primary-gold);
  color: var(--darker-bg);
  border-color: var(--primary-gold);
}

.btn-pricing.primary:hover {
  background: var(--primary-gold-hover);
  transform: translateY(-2px);
}

/* ========== 响应式设计 ========== */
@media (max-width: 768px) {
  .hero-title {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: 15px;
  }

  .section-title {
    font-size: 28px;
  }

  .section-subtitle {
    font-size: 14px;
  }

  .stat-value {
    font-size: 32px;
  }

  .feature-card h3 {
    font-size: 16px;
  }

  .cta h2 {
    font-size: 28px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .api-grid {
    grid-template-columns: 1fr;
  }

  .nav-menu {
    display: none;
  }
}

/* ========== 动画效果 ========== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content {
  animation: fadeInUp 0.8s ease-out;
}

.feature-card {
  animation: fadeInUp 0.8s ease-out;
  animation-fill-mode: both;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }