:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-text: #1f2937;
  --color-text-secondary: #6b7280;
  --color-text-light: #9ca3af;
  --color-bg: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;
  --color-border: #e5e7eb;
  --color-border-dark: #d1d5db;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --max-width: 1200px;
  --nav-height: 64px;
  --border-radius-sm: 6px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: 3rem;
}

h2 {
  font-size: 2.25rem;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--border-radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  line-height: 1.5;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  color: white;
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-dark);
}

.btn-secondary:hover {
  background-color: var(--color-bg-secondary);
  color: var(--color-text);
  border-color: var(--color-text-light);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1.125rem;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow var(--transition-normal);
}

.navbar.scrolled {
  box-shadow: var(--shadow-sm);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.navbar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.navbar-logo-icon {
  width: 36px;
  height: 36px;
  background-color: var(--color-primary);
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
  font-size: 1.25rem;
}

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

.navbar-links a {
  color: var(--color-text-secondary);
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}

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

.navbar-links a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.navbar-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  margin: 5px 0;
  transition: all var(--transition-fast);
}

.hero {
  padding: calc(var(--nav-height) + 96px) 0 64px;
  text-align: center;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
}

.hero-content {
  max-width: 800px;
  margin: 0 auto 48px;
}

.hero h1 {
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s ease forwards;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s ease 0.2s forwards;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s ease 0.4s forwards;
}

.hero-screenshot {
  max-width: 1000px;
  margin: 0 auto;
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 1s ease 0.6s forwards;
}

.hero-screenshot img {
  width: 100%;
  display: block;
}

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

section {
  padding: 96px 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 64px;
}

.section-header h2 {
  margin-bottom: 16px;
}

.section-header p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
}

.features {
  background-color: var(--color-bg-secondary);
}

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

.feature-card {
  background-color: var(--color-bg);
  padding: 32px;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border);
  transition: all var(--transition-normal);
}

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

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

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

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

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

.steps {
  background-color: var(--color-bg);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px;
  counter-reset: step;
}

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

.step-number {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
  color: white;
  font-size: 1.5rem;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  box-shadow: var(--shadow-md);
}

.step-item h3 {
  margin-bottom: 12px;
  font-size: 1.25rem;
}

.step-item p {
  color: var(--color-text-secondary);
}

.testimonials {
  background-color: var(--color-bg-secondary);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.testimonial-card {
  background-color: var(--color-bg);
  padding: 32px;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-border);
}

.testimonial-content {
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: 24px;
  line-height: 1.7;
  position: relative;
  padding-left: 20px;
  border-left: 3px solid var(--color-primary-light);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 12px;
}

.testimonial-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 1.125rem;
}

.testimonial-info h4 {
  font-size: 1rem;
  margin-bottom: 2px;
}

.testimonial-info p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer {
  background-color: var(--color-text);
  color: var(--color-text-light);
  padding: 64px 0 32px;
}

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

.footer-brand h3 {
  color: white;
  margin-bottom: 12px;
  font-size: 1.5rem;
}

.footer-brand p {
  font-size: 0.875rem;
  line-height: 1.7;
}

.footer-col h4 {
  color: white;
  margin-bottom: 20px;
  font-size: 1rem;
}

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

.footer-col ul li a {
  color: var(--color-text-light);
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
  color: white;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid #374151;
  text-align: center;
  font-size: 0.875rem;
}

.page-header {
  padding: calc(var(--nav-height) + 64px) 0 48px;
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
  text-align: center;
}

.page-header h1 {
  font-size: 2.5rem;
  margin-bottom: 12px;
}

.page-header p {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin: 0 auto;
}

.features-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.feature-detail-card {
  display: flex;
  gap: 20px;
  padding: 32px;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
}

.feature-detail-card:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-md);
}

.feature-detail-card .feature-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  margin-bottom: 0;
}

.feature-detail-card .feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-detail-content h3 {
  margin-bottom: 8px;
  font-size: 1.125rem;
}

.feature-detail-content p {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.7;
}

.download-section {
  padding: 96px 0;
}

.download-card {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  padding: 48px;
  box-shadow: var(--shadow-md);
  text-align: center;
}

.download-version {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.download-size {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-bottom: 32px;
}

.download-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 48px;
  flex-wrap: wrap;
}

.download-changelog {
  text-align: left;
  border-top: 1px solid var(--color-border);
  padding-top: 32px;
}

.download-changelog h3 {
  margin-bottom: 20px;
  font-size: 1.25rem;
}

.changelog-item {
  margin-bottom: 24px;
}

.changelog-version {
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.changelog-date {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin-left: 8px;
  font-weight: normal;
}

.changelog-item ul {
  padding-left: 20px;
  list-style: disc;
}

.changelog-item ul li {
  color: var(--color-text-secondary);
  margin-bottom: 6px;
  font-size: 0.9375rem;
}

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

.about-content h2 {
  margin-top: 48px;
  margin-bottom: 16px;
  font-size: 1.75rem;
}

.about-content h2:first-child {
  margin-top: 0;
}

.about-content p {
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin: 32px 0;
}

.about-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 20px;
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius-md);
}

.about-feature-item .feature-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 0;
  flex-shrink: 0;
}

.about-feature-item .feature-icon svg {
  width: 20px;
  height: 20px;
}

.about-feature-item h4 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.about-feature-item p {
  font-size: 0.875rem;
  margin-bottom: 0;
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 32px;
}

.team-member {
  text-align: center;
  padding: 32px;
  background-color: var(--color-bg-secondary);
  border-radius: var(--border-radius-md);
}

.team-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background-color: var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: var(--color-primary);
  font-size: 1.75rem;
  font-weight: 600;
}

.team-member h4 {
  margin-bottom: 4px;
}

.team-member p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1024px) {
  .features-grid,
  .steps-grid,
  .testimonials-grid,
  .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  h3 {
    font-size: 1.25rem;
  }
  
  section {
    padding: 64px 0;
  }
  
  .navbar-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--color-bg);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
  }
  
  .navbar-links.open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .navbar-toggle {
    display: block;
  }
  
  .navbar-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  
  .navbar-toggle.active span:nth-child(2) {
    opacity: 0;
  }
  
  .navbar-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
  }
  
  .hero {
    padding: calc(var(--nav-height) + 64px) 0 48px;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .features-grid,
  .steps-grid,
  .testimonials-grid,
  .features-detail-grid,
  .about-features,
  .team-grid {
    grid-template-columns: 1fr;
  }
  
  .steps-grid {
    gap: 32px;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .download-card {
    padding: 32px 24px;
  }
}