/**
 * 店赢OS - 顶级SaaS模板风格 v1
 * 设计灵感：Linear / Vercel / Stripe / Modern SaaS
 * 特点：玻璃拟态、渐变背景、3D效果、视差滚动、流畅动画
 */

/* ============================================
   CSS Variables - 高级SaaS配色
   ============================================ */
:root {
  /* 主色调 - 紫色渐变系列 */
  --primary: #6366F1;
  --primary-light: #818CF8;
  --primary-dark: #4F46E5;
  --primary-gradient: linear-gradient(135deg, #6366F1 0%, #8B5CF6 50%, #A855F7 100%);

  /* 辅助色 */
  --accent: #06B6D4;
  --accent-light: #22D3EE;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;

  /* 背景系统 */
  --bg: #0F172A;
  --bg-light: #1E293B;
  --bg-lighter: #334155;
  --bg-card: rgba(30, 41, 59, 0.7);
  --bg-glass: rgba(255, 255, 255, 0.05);

  /* 文字系统 */
  --text: #F8FAFC;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;

  /* 边框系统 */
  --border: rgba(255, 255, 255, 0.1);
  --border-light: rgba(255, 255, 255, 0.05);

  /* 阴影系统 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);

  /* 圆角系统 */
  --radius: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* 动画曲线 */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Base Reset & Global Styles
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

/* ============================================
   动态背景网格 + 渐变
   ============================================ */
.bg-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  z-index: -2;
  pointer-events: none;
}

.bg-gradient {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    radial-gradient(ellipse 80% 50% at 20% -20%, rgba(99, 102, 241, 0.15), transparent),
    radial-gradient(ellipse 60% 40% at 80% 110%, rgba(6, 182, 212, 0.15), transparent),
    radial-gradient(ellipse 50% 30% at 50% 50%, rgba(139, 92, 246, 0.1), transparent);
  z-index: -1;
  pointer-events: none;
  animation: gradientMove 20s ease-in-out infinite;
}

@keyframes gradientMove {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.8; }
}

/* ============================================
   玻璃拟态卡片
   ============================================ */
.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.glass-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: var(--shadow-glow);
  transform: translateY(-4px);
}

/* ============================================
   渐变文字效果
   ============================================ */
.gradient-text {
  background: linear-gradient(135deg, #6366F1, #8B5CF6, #06B6D4);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradientShift 4s ease infinite;
}

@keyframes gradientShift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

/* ============================================
   发光按钮
   ============================================ */
.btn-glow {
  position: relative;
  background: var(--primary-gradient);
  color: white;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  overflow: hidden;
  z-index: 1;
}

.btn-glow::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  transition: left 0.5s;
  z-index: -1;
}

.btn-glow:hover::before {
  left: 100%;
}

.btn-glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 40px rgba(99, 102, 241, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  padding: 14px 32px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-outline:hover {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

/* ============================================
   导航栏 - 玻璃拟态
   ============================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(15, 23, 42, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.navbar-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
}

.navbar-logo-icon {
  width: 40px;
  height: 40px;
  background: var(--primary-gradient);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
}

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

.navbar-links a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-gradient);
  transition: width var(--transition-normal);
}

.navbar-links a:hover {
  color: var(--text);
}

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

/* ============================================
   Hero Section
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 120px 24px 80px;
  position: relative;
  text-align: center;
}

.hero-content {
  max-width: 900px;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 100px;
  font-size: 0.875rem;
  color: var(--primary-light);
  margin-bottom: 32px;
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  animation: fadeInUp 0.6s ease 0.2s both;
  letter-spacing: -0.02em;
}

.hero-title span {
  display: block;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
  animation: fadeInUp 0.6s ease 0.3s both;
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 48px;
  animation: fadeInUp 0.6s ease 0.4s both;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.5s both;
}

.hero-stat {
  text-align: center;
}

.hero-stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-stat-label {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 4px;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   漂浮元素效果
   ============================================ */
.float-element {
  position: absolute;
  animation: float 6s ease-in-out infinite;
}

.float-element:nth-child(2) {
  animation-delay: -2s;
}

.float-element:nth-child(3) {
  animation-delay: -4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(2deg); }
}

/* ============================================
   Section通用样式
   ============================================ */
.section {
  padding: 100px 24px;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 64px;
}

.section-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: 100px;
  font-size: 0.75rem;
  color: var(--primary-light);
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
}

.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ============================================
   Features Grid - 3列
   ============================================ */
.features-grid {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  padding: 32px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary-gradient);
  transform: scaleX(0);
  transition: transform var(--transition-normal);
}

.feature-card:hover::before {
  transform: scaleX(1);
}

.feature-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-8px);
  box-shadow: var(--shadow-glow);
}

.feature-icon {
  width: 52px;
  height: 52px;
  background: var(--primary-gradient);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.5rem;
  margin-bottom: 20px;
}

.feature-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.feature-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ============================================
   Platform Showcase - 8大平台
   ============================================ */
.platform-section {
  background: linear-gradient(180deg, transparent, rgba(99, 102, 241, 0.03), transparent);
}

.platform-grid {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.platform-item {
  padding: 24px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-align: center;
  transition: all var(--transition-normal);
}

.platform-item:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: scale(1.05);
}

.platform-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 12px;
  background: var(--primary-gradient);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.25rem;
}

.platform-name {
  font-size: 0.9rem;
  font-weight: 500;
}

/* ============================================
   Pricing Section
   ============================================ */
.pricing-grid {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.pricing-card {
  padding: 40px 32px;
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
  position: relative;
}

.pricing-card.featured {
  border-color: var(--primary);
  transform: scale(1.05);
  box-shadow: var(--shadow-glow);
}

.pricing-card.featured::before {
  content: '推荐';
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 4px 16px;
  background: var(--primary-gradient);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: white;
}

.pricing-card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  transform: translateY(-8px);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-8px);
}

.pricing-name {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.pricing-price {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.pricing-price span {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

.pricing-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

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

.pricing-features li {
  padding: 10px 0;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.pricing-features li::before {
  content: '✓';
  color: var(--success);
  font-weight: bold;
}

/* ============================================
   CTA Section
   ============================================ */
.cta-section {
  text-align: center;
  padding: 120px 24px;
}

.cta-card {
  max-width: 800px;
  margin: 0 auto;
  padding: 64px;
  background: var(--primary-gradient);
  border-radius: var(--radius-xl);
  position: relative;
  overflow: hidden;
}

.cta-card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: rotate 20s linear infinite;
}

@keyframes rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}

.cta-subtitle {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-bottom: 32px;
  position: relative;
  z-index: 1;
}

.cta-btn {
  background: white;
  color: var(--primary);
  padding: 16px 40px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  z-index: 1;
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* ============================================
   Footer
   ============================================ */
.footer {
  padding: 64px 24px 32px;
  border-top: 1px solid var(--border);
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-logo-icon {
  width: 36px;
  height: 36px;
  background: var(--primary-gradient);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.footer-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-column h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

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

.footer-column a {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

.footer-column a:hover {
  color: var(--text);
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-card.featured {
    transform: scale(1);
    order: -1;
    grid-column: 1 / -1;
    max-width: 500px;
    margin: 0 auto;
  }

  .footer-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .navbar-links {
    display: none;
  }

  .hero-title {
    font-size: 2rem;
  }

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

  .hero-stats {
    gap: 24px;
  }

  .hero-stat-value {
    font-size: 1.75rem;
  }

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

  .platform-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .pricing-card.featured {
    transform: scale(1);
  }

  .cta-card {
    padding: 40px 24px;
  }

  .cta-title {
    font-size: 1.75rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}