/* 可乐云 纯原生浅色主题 CSS */

:root {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-header: rgba(255, 255, 255, 0.92);
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-light: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-gradient: linear-gradient(135deg, #2563eb 0%, #0284c7 100%);
  --primary-gradient-hover: linear-gradient(135deg, #1d4ed8 0%, #0369a1 100%);
  --accent-orange: #f97316;
  --border-color: #e2e8f0;
  --border-focus: #93c5fd;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 25px -5px rgba(37, 99, 235, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --max-width: 1200px;
}

/* 基础重置 */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

/* 布局容器 */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* 通用按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all 0.25s ease;
  cursor: pointer;
  border: none;
  text-align: center;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary-gradient);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
  background: var(--primary-gradient-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

.btn-outline {
  background: #ffffff;
  color: var(--primary);
  border: 2px solid var(--border-color);
}

.btn-outline:hover {
  border-color: var(--primary);
  background: #f0f7ff;
  transform: translateY(-2px);
}

.btn-large {
  padding: 16px 36px;
  font-size: 1.125rem;
}

/* 顶部导航 */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
}

.logo-badge {
  background: var(--primary-gradient);
  color: #ffffff;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 700;
}

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

.nav-links a {
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

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

/* Hero 区域 */
.hero {
  padding: 90px 0 60px;
  text-align: center;
  background: radial-gradient(circle at 50% 20%, rgba(37, 99, 235, 0.08) 0%, transparent 70%);
}

.hero-tag {
  display: inline-block;
  padding: 6px 16px;
  background: #eff6ff;
  color: var(--primary);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-title {
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: -1px;
  color: var(--text-main);
}

.hero-title span {
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 760px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

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

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  background: var(--bg-card);
  padding: 32px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-md);
  margin-top: 40px;
}

.hero-image-wrapper {
  margin: 40px 0 20px;
  text-align: center;
}

.hero-image-wrapper img {
  width: 100%;
  max-width: 920px;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 40px -12px rgba(37, 99, 235, 0.25), 0 10px 25px -10px rgba(0, 0, 0, 0.08);
  border: 3px solid #ffffff;
  transition: all 0.35s ease;
}

.hero-image-wrapper img:hover {
  transform: translateY(-6px);
  box-shadow: 0 30px 60px -15px rgba(37, 99, 235, 0.35), 0 15px 30px -10px rgba(0, 0, 0, 0.12);
}

.stat-item h3 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 4px;
}

.stat-item p {
  font-size: 0.9rem;
  color: var(--text-light);
}

/* 区块通用结构 */
.section {
  padding: 80px 0;
}

.section-alt {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-title {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto;
}

/* 产品核心优势 */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  background: var(--bg-card);
  padding: 36px 28px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  background: #eff6ff;
  color: var(--primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 流媒体与 AI 支持 */
.support-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.support-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
}

.support-box h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.support-box p {
  color: var(--text-muted);
  margin-bottom: 28px;
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tag-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: #f1f5f9;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-main);
  border: 1px solid #e2e8f0;
}

/* 价格对比 */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  align-items: stretch;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.pricing-card.popular {
  border: 2px solid var(--primary);
  box-shadow: var(--shadow-lg);
  transform: scale(1.03);
}

.popular-badge {
  position: absolute;
  top: -15px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
  color: #ffffff;
  padding: 6px 20px;
  border-radius: var(--radius-full);
  font-size: 0.875rem;
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(249, 115, 22, 0.35);
  letter-spacing: 0.5px;
  z-index: 10;
}

.pricing-header h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-desc {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 24px;
}

.pricing-price {
  font-size: 2.75rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 24px;
}

.pricing-price span {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-light);
}

.pricing-features {
  list-style: none;
  margin-bottom: 36px;
  flex-grow: 1;
}

.pricing-features li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--border-color);
  font-size: 0.95rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li::before {
  content: "✓";
  color: #10b981;
  font-weight: 800;
}

.pricing-card .btn {
  width: 100%;
}

/* FAQ 问答 */
.faq-grid {
  max-width: 840px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}

.faq-item h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.faq-item p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* 用户评价 */
.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.stars {
  color: #f59e0b;
  font-size: 1.1rem;
  margin-bottom: 12px;
}

.testimonial-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  font-style: italic;
  line-height: 1.6;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: #dbeafe;
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.user-details h4 {
  font-size: 0.95rem;
  font-weight: 700;
}

.user-details span {
  font-size: 0.85rem;
  color: var(--text-light);
}

/* 子页面独立内容样式 */
.page-header {
  background: #ffffff;
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.page-content {
  padding: 60px 0;
  background: #ffffff;
  min-height: 50vh;
}

.content-block {
  max-width: 900px;
  margin: 0 auto;
  line-height: 1.8;
  color: var(--text-muted);
}

.content-block h2 {
  font-size: 1.5rem;
  color: var(--text-main);
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid #eff6ff;
}

.content-block p {
  margin-bottom: 16px;
}

.content-block ul {
  margin-bottom: 20px;
  padding-left: 24px;
}

.content-block li {
  margin-bottom: 8px;
}

/* 全站规范页脚 */
.footer {
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 48px 0 32px;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.footer-nav-titles {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 48px;
  list-style: none;
}

.footer-nav-titles a {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  transition: color 0.2s ease;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  background: var(--bg-main);
  border: 1px solid var(--border-color);
}

.footer-nav-titles a:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: #eff6ff;
}

.footer-bottom {
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-light);
  border-top: 1px dashed var(--border-color);
  width: 100%;
  padding-top: 24px;
}

/* 移动端响应式适配 @media */
@media (max-width: 768px) {
  .header-nav {
    height: 64px;
  }

  .nav-links {
    display: none; /* 移动端精简导航 */
  }

  .hero {
    padding: 50px 0 40px;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .hero-subtitle {
    font-size: 1rem;
  }

  .hero-cta {
    flex-direction: column;
    width: 100%;
  }

  .hero-cta .btn {
    width: 100%;
    padding: 16px 20px;
  }

  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    padding: 20px;
  }

  .features-grid,
  .support-grid,
  .pricing-grid,
  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .pricing-card.popular {
    transform: none;
  }

  .footer-nav-titles {
    flex-direction: column;
    gap: 16px;
    width: 100%;
  }

  .footer-nav-titles a {
    width: 100%;
    text-align: center;
    padding: 12px 20px;
  }

  .container {
    padding: 0 16px;
  }
}