/* Clean Minimal Light Theme - 清新简约浅色风格 */

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

html {
  scroll-behavior: smooth;
}

:root {
  --bg-primary: #fafafa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f5f5f5;
  --bg-card: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-muted: #999999;
  --accent-primary: #10b981;
  --accent-secondary: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);
  --border-color: #e5e5e5;
  --shadow-glow: 0 8px 32px rgba(16, 185, 129, 0.15);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.06);
  --shadow-hover: 0 12px 48px rgba(0, 0, 0, 0.1);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

/* Background Soft Gradient (简化以提升性能) */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 20% 30%, rgba(16, 185, 129, 0.04) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
  will-change: transform;
}

/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}

.navbar-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  transition: transform 0.3s ease;
}

.logo:hover {
  transform: scale(1.05);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-gradient);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.2);
  position: relative;
  overflow: hidden;
}

.logo-icon svg {
  width: 22px;
  height: 22px;
  color: white;
  position: relative;
  z-index: 1;
}

.logo-text {
  font-size: 1.6rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
}

.nav-links a:not(.btn-download)::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: all 0.3s ease;
  transform: translateX(-50%);
  border-radius: 2px;
}

.nav-links a:not(.btn-download):hover {
  color: var(--text-primary);
}

.nav-links a:not(.btn-download):hover::after {
  width: 100%;
}

.btn-download {
  background: var(--accent-gradient);
  color: white;
  padding: 0.7rem 2rem;
  border-radius: 8px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
  position: relative;
  overflow: hidden;
}

.btn-download::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 ease;
}

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

.btn-download:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(16, 185, 129, 0.4);
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 110px 2.5rem 6rem;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.2);
  padding: 0.6rem 1.5rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 2.5rem;
  letter-spacing: 0.5px;
}

.hero-badge::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--accent-primary);
  border-radius: 50%;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.2); }
}

.hero h1 {
  font-size: 4rem;
  font-weight: 800;
  margin-bottom: 1.5rem;
  line-height: 1.15;
  letter-spacing: -1.5px;
  color: var(--text-primary);
}

.hero h1 .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}

.hero p {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  max-width: 600px;
  line-height: 1.8;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  background: var(--accent-gradient);
  color: white;
  padding: 1rem 2.5rem;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  box-shadow: 0 6px 20px rgba(16, 185, 129, 0.3);
  position: relative;
  overflow: hidden;
}

.btn-primary::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 ease;
}

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

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(16, 185, 129, 0.4);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  background: white;
  color: var(--text-primary);
  padding: 1rem 2.5rem;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.3s ease;
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-primary);
  transform: translateY(-3px);
}

.hero-stats {
  display: flex;
  gap: 6rem;
  justify-content: center;
  margin-top: 5rem;
  flex-wrap: wrap;
}

.stat-item {
  text-align: center;
  position: relative;
}

.stat-item::after {
  content: '';
  position: absolute;
  top: -10px;
  right: -3rem;
  width: 1px;
  height: calc(100% + 20px);
  background: linear-gradient(to bottom, transparent, var(--border-color), transparent);
}

.stat-item:last-child::after {
  display: none;
}

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.9rem;
  font-weight: 500;
  margin-top: 0.5rem;
  letter-spacing: 0.5px;
}

/* Section Styles */
.section {
  padding: 7rem 2.5rem;
  position: relative;
  z-index: 1;
}

.section-title {
  text-align: center;
  margin-bottom: 4.5rem;
}

.section-title h2 {
  font-size: 2.75rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -1px;
  color: var(--text-primary);
}

.section-title h2 span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-title p {
  color: var(--text-secondary);
  font-size: 1.1rem;
}

/* Features Section */
.features {
  background: var(--bg-secondary);
}

.features-grid {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.feature-card {
  background: white;
  border: 1px solid var(--border-color);
  padding: 2.5rem;
  border-radius: 16px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
  will-change: transform, box-shadow;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(16, 185, 129, 0.3);
  box-shadow: var(--shadow-hover);
}

.feature-icon {
  width: 56px;
  height: 56px;
  background: var(--accent-gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.25);
}

.feature-icon svg {
  width: 28px;
  height: 28px;
  color: white;
}

.feature-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

/* Pricing Section */
.pricing {
  background: var(--bg-primary);
}

.pricing-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
}

.pricing-card {
  background: white;
  border: 1px solid var(--border-color);
  padding: 2.5rem;
  border-radius: 16px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  display: flex;
  flex-direction: column;
  will-change: transform, box-shadow;
}

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

.pricing-card:hover {
  transform: translateY(-6px) scale(1.02);
  border-color: rgba(16, 185, 129, 0.4);
  box-shadow: var(--shadow-hover);
}

.pricing-card.featured:hover {
  transform: scale(1.05) translateY(-6px);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent-gradient);
  color: white;
  padding: 0.4rem 1.25rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
}

.pricing-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.price {
  font-size: 2.75rem;
  font-weight: 800;
  margin-bottom: 0.25rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.price span {
  font-size: 1rem;
  color: var(--text-muted);
  -webkit-text-fill-color: var(--text-muted);
}

.period {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

.features-list {
  list-style: none;
  margin-bottom: 2rem;
  flex-grow: 1;
}

.features-list li {
  padding: 0.75rem 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.features-list li svg {
  width: 18px;
  height: 18px;
  color: var(--accent-primary);
  flex-shrink: 0;
}

.btn-pricing {
  display: block;
  width: 100%;
  padding: 0.875rem;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  text-align: center;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
}

.btn-pricing:hover {
  background: var(--accent-gradient);
  border-color: transparent;
}

.pricing-card.featured .btn-pricing {
  background: var(--accent-gradient);
  border-color: transparent;
}

.pricing-card.featured .btn-pricing:hover {
  opacity: 0.9;
}

/* Download Section */
.download {
  background: var(--bg-secondary);
}

.download-grid {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.download-card {
  background: white;
  border: 1px solid var(--border-color);
  padding: 2.5rem 2rem;
  border-radius: 16px;
  text-align: center;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  will-change: transform, box-shadow;
}

.download-card:hover {
  transform: translateY(-6px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-hover);
}

.download-icon {
  width: 64px;
  height: 64px;
  background: var(--bg-tertiary);
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.5rem;
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
}

.download-card:hover .download-icon {
  background: var(--accent-gradient);
  border-color: transparent;
  transform: rotate(5deg) scale(1.05);
}

.download-icon svg {
  width: 32px;
  height: 32px;
  color: var(--text-primary);
  transition: all 0.3s ease;
}

.download-card:hover .download-icon svg {
  color: white;
}

.download-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.download-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.btn-download-card {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  text-decoration: none;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  transition: all 0.3s ease;
  border: 1px solid var(--border-color);
}

.btn-download-card:hover {
  background: var(--accent-gradient);
  border-color: transparent;
}

/* CTA Section */
.cta {
  padding: 6rem 2.5rem;
  background: var(--bg-primary);
  text-align: center;
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
}

.cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at center, rgba(16, 185, 129, 0.04) 0%, transparent 70%);
}

.cta h2 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
  color: var(--text-primary);
}

.cta h2 span {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cta p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
  position: relative;
  z-index: 1;
}

.cta .btn-primary {
  position: relative;
  z-index: 1;
}

/* Footer */
.footer {
  background: white;
  color: var(--text-secondary);
  padding: 5rem 2.5rem 2rem;
  border-top: 1px solid var(--border-color);
  position: relative;
  z-index: 1;
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer h3 {
  color: var(--text-primary);
  font-weight: 700;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  letter-spacing: 0.5px;
}

.footer ul {
  list-style: none;
}

.footer li {
  padding: 0.5rem 0;
}

.footer a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  display: inline-block;
}

.footer a:hover {
  color: var(--accent-primary);
  transform: translateX(4px);
}

.footer-bottom {
  max-width: 1300px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Scroll to Top Button */
.scroll-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 50px;
  height: 50px;
  background: var(--accent-gradient);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 4px 20px rgba(16, 185, 129, 0.3);
  z-index: 999;
  border: none;
}

.scroll-top.visible {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 30px rgba(16, 185, 129, 0.5);
}

.scroll-top svg {
  width: 24px;
  height: 24px;
  color: white;
}

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

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

  .hero h1 { font-size: 3.25rem; }
  .section-title h2 { font-size: 2.25rem; }
}

@media (max-width: 768px) {
  .navbar-content {
    padding: 0 1.5rem;
  }

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

  .hero {
    padding: 110px 1.5rem 4rem;
  }

  .hero h1 { font-size: 2.5rem; }
  .hero p { font-size: 1.1rem; }
  .hero-stats { gap: 2rem; }

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

  .section {
    padding: 5rem 1.5rem;
  }

  .hero-stats { margin-top: 3rem; }
}

@media (max-width: 480px) {
  .features-grid {
    grid-template-columns: 1fr;
  }

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

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

  .navbar-content {
    padding: 0 1rem;
  }

  .logo-text {
    font-size: 1.25rem;
  }

  .btn-download {
    padding: 0.5rem 1.25rem;
    font-size: 0.8rem;
  }

  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  .btn-primary, .btn-secondary { padding: 0.875rem 1.75rem; font-size: 0.9rem; }

  .section {
    padding: 4rem 1rem;
  }

  .section-title h2 { font-size: 1.75rem; }
  .cta h2 { font-size: 1.5rem; }

  .hero-stats {
    flex-direction: column;
    gap: 2rem;
  }

  .stat-item::after {
    display: none;
  }
}