/* Reset and base styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --douyin: #00F2EA;
  --douyin-dark: #00D4CC;
  --weibo: #E6162D;
  --weibo-dark: #C41426;
  --primary: #6C5CE7;
  --primary-dark: #5B4BD5;
  --background: #ffffff;
  --foreground: #1a1a1a;
  --muted-foreground: #6b7280;
  --border: #e5e7eb;
  --card: #ffffff;
  --accent: #f9fafb;
  --radius: 16px;
  --shadow: 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);
}

body {
  background: var(--background);
  color: var(--foreground);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--foreground);
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

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

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

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--douyin) 0%, var(--weibo) 100%);
  color: white;
  text-decoration: none;
  border-radius: 10px;
  font-weight: 600;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 242, 234, 0.3);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background: white;
  color: var(--foreground);
  text-decoration: none;
  border-radius: 10px;
  font-weight: 600;
  transition: all 0.2s;
  border: 2px solid var(--border);
}

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

.btn-large {
  padding: 16px 32px;
  font-size: 16px;
}

.wechat-qr {
  width: 160px;
  height: 160px;
  border-radius: 16px;
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  padding: 10px;
}

.wechat-qr:hover {
  transform: scale(1.05);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
}

/* Hero Section */
.hero {
  padding: 160px 0 100px;
  background: linear-gradient(180deg, #f8fffe 0%, #fff 50%, #fff5f6 100%);
  text-align: center;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
}

.platform-badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 24px;
}

.platform-badge {
  padding: 8px 20px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 14px;
}

.platform-badge.douyin {
  background: var(--douyin);
  color: #1a1a1a;
}

.platform-badge.weibo {
  background: var(--weibo);
  color: white;
}

.hero h1 {
  font-size: 52px;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.1;
}

.subtitle {
  font-size: 20px;
  color: var(--muted-foreground);
  margin-bottom: 40px;
  line-height: 1.6;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 48px;
}

.trust-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: white;
  border-radius: 50px;
  box-shadow: var(--shadow);
  font-size: 14px;
  color: var(--muted-foreground);
}

.trust-badge strong {
  background: linear-gradient(135deg, var(--douyin) 0%, var(--weibo) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-size: 24px;
}

/* Services Section */
.services-section {
  padding: 100px 0;
  background: white;
}

.section-title {
  font-size: 40px;
  font-weight: 700;
  text-align: center;
  margin-bottom: 60px;
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.service-card {
  padding: 40px;
  border-radius: var(--radius);
  border: 2px solid;
  transition: transform 0.3s, box-shadow 0.3s;
}

.service-card:hover {
  transform: translateY(-4px);
}

.service-card.douyin {
  background: linear-gradient(135deg, rgba(0, 242, 234, 0.05) 0%, rgba(0, 242, 234, 0.15) 100%);
  border-color: rgba(0, 242, 234, 0.3);
}

.service-card.weibo {
  background: linear-gradient(135deg, rgba(230, 22, 45, 0.05) 0%, rgba(230, 22, 45, 0.15) 100%);
  border-color: rgba(230, 22, 45, 0.3);
}

.service-header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.service-header h3 {
  font-size: 24px;
}

.service-features {
  list-style: none;
  margin-bottom: 24px;
}

.service-features li {
  padding: 10px 0;
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.check {
  color: #10B981;
  font-weight: 700;
}

.btn-service {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-service.douyin-btn {
  background: var(--douyin);
  color: #1a1a1a;
}

.btn-service.douyin-btn:hover {
  background: var(--douyin-dark);
}

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

.btn-service.weibo-btn:hover {
  background: var(--weibo-dark);
}

/* Problem Section */
.problem-section {
  padding: 100px 0;
  background: var(--accent);
}

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.problem-card {
  padding: 32px;
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  transition: transform 0.2s;
}

.problem-card:hover {
  transform: translateY(-4px);
}

.problem-icon {
  margin-bottom: 20px;
}

.problem-card h3 {
  font-size: 20px;
  margin-bottom: 12px;
}

.problem-card p {
  color: var(--muted-foreground);
  font-size: 15px;
}

/* Features Section */
.features-section {
  padding: 100px 0;
  background: white;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  padding: 32px;
  background: var(--accent);
  border-radius: var(--radius);
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  border-radius: 12px;
  margin-bottom: 20px;
  color: var(--primary);
  box-shadow: var(--shadow);
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
}

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

/* Pricing Section */
.pricing-section {
  padding: 100px 0;
  background: var(--accent);
}

.platform-pricing-tabs {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.tab-btn {
  padding: 14px 32px;
  border: 2px solid var(--border);
  background: white;
  border-radius: 50px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

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

.tab-btn.active {
  background: linear-gradient(135deg, var(--douyin) 0%, var(--weibo) 100%);
  border-color: transparent;
  color: white;
}

.pricing-content {
  display: none;
}

.pricing-content.active {
  display: block;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: start;
}

.pricing-card {
  padding: 40px 32px;
  background: white;
  border-radius: var(--radius);
  border: 2px solid var(--border);
  text-align: center;
  position: relative;
  transition: transform 0.2s, box-shadow 0.2s;
}

.pricing-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
  border: 2px solid transparent;
  background: linear-gradient(white, white) padding-box,
              linear-gradient(135deg, var(--douyin) 0%, var(--weibo) 100%) border-box;
  transform: scale(1.05);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-4px);
}

.featured-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 6px 16px;
  background: linear-gradient(135deg, var(--douyin) 0%, var(--weibo) 100%);
  color: white;
  font-size: 12px;
  font-weight: 600;
  border-radius: 50px;
}

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

.pricing-desc {
  color: var(--muted-foreground);
  font-size: 14px;
  margin-bottom: 24px;
}

.pricing-price {
  margin-bottom: 32px;
}

.currency {
  font-size: 24px;
  font-weight: 600;
  vertical-align: top;
}

.amount {
  font-size: 56px;
  font-weight: 800;
  background: linear-gradient(135deg, var(--douyin) 0%, var(--weibo) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.period {
  font-size: 16px;
  color: var(--muted-foreground);
}

.pricing-features {
  list-style: none;
  margin-bottom: 32px;
  text-align: left;
}

.pricing-features li {
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  font-size: 15px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.pricing-features li:last-child {
  border-bottom: none;
}

.cross {
  color: #9CA3AF;
}

.pricing-features li.disabled {
  color: #9CA3AF;
}

.btn-pricing {
  display: block;
  width: 100%;
  padding: 14px 24px;
  background: var(--accent);
  color: var(--foreground);
  text-decoration: none;
  border-radius: 10px;
  font-weight: 600;
  transition: all 0.2s;
}

.btn-pricing:hover {
  background: var(--foreground);
  color: white;
}

.pricing-card.featured .btn-pricing {
  background: linear-gradient(135deg, var(--douyin) 0%, var(--weibo) 100%);
  color: white;
}

.pricing-card.featured .btn-pricing:hover {
  transform: scale(1.02);
}

.pricing-note {
  text-align: center;
  margin-top: 48px;
  color: var(--muted-foreground);
  font-size: 14px;
}

/* FAQ Section */
.faq-section {
  padding: 100px 0;
  background: white;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-question {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  cursor: pointer;
  transition: background 0.2s;
}

.faq-question:hover {
  background: white;
}

.faq-question h3 {
  font-size: 16px;
  font-weight: 600;
}

.faq-toggle {
  font-size: 24px;
  color: var(--primary);
  font-weight: 300;
  transition: transform 0.2s;
}

.faq-item.active .faq-toggle {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 24px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
  padding: 0 24px 20px;
  max-height: 200px;
}

.faq-answer p {
  color: var(--muted-foreground);
  font-size: 15px;
  line-height: 1.7;
}

/* Contact Section */
.contact-section {
  padding: 100px 0;
  background: var(--accent);
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact-info h2 {
  font-size: 32px;
  margin-bottom: 12px;
}

.contact-info > p {
  color: var(--muted-foreground);
  margin-bottom: 40px;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

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

.contact-item h4 {
  font-size: 16px;
  margin-bottom: 4px;
}

.contact-item p {
  color: var(--muted-foreground);
  font-size: 14px;
}

.contact-form {
  background: white;
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 2px solid var(--border);
  border-radius: 10px;
  font-size: 15px;
  font-family: inherit;
  transition: border-color 0.2s;
  background: white;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary);
}

.form-group select {
  cursor: pointer;
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

.btn-submit {
  width: 100%;
  padding: 16px 24px;
  background: linear-gradient(135deg, var(--douyin) 0%, var(--weibo) 100%);
  color: white;
  border: none;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 242, 234, 0.3);
}

.btn-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

/* Responsive */
@media (max-width: 968px) {
  .hero h1 {
    font-size: 40px;
  }
  
  .services-grid,
  .problem-grid,
  .features-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  
  .pricing-card.featured {
    transform: none;
  }
  
  .pricing-card.featured:hover {
    transform: translateY(-4px);
  }
  
  .contact-wrapper {
    grid-template-columns: 1fr;
  }

  .nav-links a:not(.btn-primary) {
    display: none;
  }
}

@media (max-width: 640px) {
  .hero {
    padding: 120px 0 60px;
  }
  
  .hero h1 {
    font-size: 32px;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .contact-form {
    padding: 24px;
  }
  
  .platform-pricing-tabs {
    flex-direction: column;
    align-items: stretch;
  }
}