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

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #e9ecef;
  --text-primary: #1a1a1a;
  --text-secondary: #6c757d;
  --text-tertiary: #adb5bd;
  --border-color: #dee2e6;
  --accent-primary: #667eea;
  --accent-secondary: #764ba2;
  --card-bg: #ffffff;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-tertiary: #6e7681;
  --border-color: #30363d;
  --card-bg: #161b22;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

/* 导航栏 */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: background-color 0.3s ease;
}

[data-theme="dark"] .navbar {
  background: rgba(13, 17, 23, 0.8);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-left,
.nav-right {
  display: flex;
  align-items: center;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
  transition: opacity 0.2s;
}

.logo:hover {
  opacity: 0.8;
}

.logo svg {
  color: var(--accent-primary);
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

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

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text-secondary);
  transition: background-color 0.2s, color 0.2s;
}

.btn-icon:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.theme-icon {
  transition: opacity 0.2s;
}

.theme-icon.sun {
  display: block;
}

.theme-icon.moon {
  display: none;
}

[data-theme="dark"] .theme-icon.sun {
  display: none;
}

[data-theme="dark"] .theme-icon.moon {
  display: block;
}

.lang-text {
  font-size: 13px;
  font-weight: 600;
}

.btn-primary {
  padding: 8px 16px;
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.mobile-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s;
}

/* Hero 区域 */
.hero {
  position: relative;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 30% 20%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 70% 80%, rgba(118, 75, 162, 0.1) 0%, transparent 50%);
  z-index: -1;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  padding: 6px 12px;
  background: var(--bg-tertiary);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 24px;
}

.hero-title {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -0.02em;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 32px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  margin-bottom: 48px;
}

.btn-large {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-large.btn-primary {
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  color: white;
}

.btn-large.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(102, 126, 234, 0.4);
}

.btn-large.btn-secondary {
  background: var(--card-bg);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-large.btn-secondary:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 48px;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.stat-value {
  font-size: 32px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
}

/* Hero Visual */
.hero-visual {
  position: relative;
}

.app-preview {
  position: relative;
  animation: float 6s ease-in-out infinite;
}

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

.app-window {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.window-header {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
}

.window-controls {
  display: flex;
  gap: 8px;
}

.window-controls span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--text-tertiary);
}

.window-controls span:nth-child(1) {
  background: #ff5f57;
}

.window-controls span:nth-child(2) {
  background: #febc2e;
}

.window-controls span:nth-child(3) {
  background: #28c840;
}

.window-title {
  flex: 1;
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}

.window-content {
  padding: 24px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  margin-bottom: 16px;
}

.search-box svg {
  color: var(--text-tertiary);
}

.search-box input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
}

.quick-items {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.quick-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  background: var(--bg-secondary);
  border-radius: 10px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.quick-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.item-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  color: white;
  font-weight: 700;
  font-size: 14px;
}

.quick-item span {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
}

.floating-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  box-shadow: var(--shadow-md);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  animation: float-delayed 6s ease-in-out infinite;
}

.floating-card svg {
  color: var(--accent-primary);
}

.card-1 {
  top: 20%;
  right: -10%;
  animation-delay: -2s;
}

.card-2 {
  bottom: 20%;
  left: -10%;
  animation-delay: -4s;
}

@keyframes float-delayed {
  0%,
  100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-15px) rotate(2deg);
  }
}

/* 功能特性 */
.features {
  padding: 100px 0;
  background: var(--bg-secondary);
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-title {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-description {
  font-size: 18px;
  color: var(--text-secondary);
}

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

.feature-card {
  padding: 32px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  transition: transform 0.2s, box-shadow 0.2s;
}

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

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  border-radius: 12px;
  color: var(--accent-primary);
  margin-bottom: 20px;
}

.feature-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 12px;
}

.feature-description {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* 展示区域 */
.showcase {
  padding: 100px 0;
}

.showcase-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.showcase-label {
  display: inline-flex;
  padding: 6px 12px;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: 16px;
}

.showcase-title {
  font-size: 42px;
  font-weight: 800;
  margin-bottom: 24px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.showcase-description {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 32px;
}

.showcase-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.showcase-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 16px;
}

.showcase-list svg {
  color: var(--accent-primary);
}

.performance-chart {
  padding: 32px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: var(--shadow-md);
}

.chart-header {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.chart-bars {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.chart-bar {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.bar-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.bar-container {
  position: relative;
  height: 40px;
  background: var(--bg-secondary);
  border-radius: 8px;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 8px;
  transition: width 1s ease-out;
  animation: fillBar 1.5s ease-out;
}

@keyframes fillBar {
  from {
    width: 0;
  }
}

.bar-value {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
}

/* 下载区域 */
.download {
  padding: 100px 0;
  background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
}

.download-card {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.download-title {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.download-description {
  font-size: 18px;
  color: var(--text-secondary);
  margin-bottom: 48px;
}

.download-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.download-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: var(--bg-secondary);
  border: 2px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
}

.download-btn:hover {
  border-color: var(--accent-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.download-btn svg {
  color: var(--accent-primary);
}

.download-btn span {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
}

.download-btn strong {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
}

.download-btn small {
  font-size: 13px;
  color: var(--text-secondary);
}

/* 页脚 */
.footer {
  padding: 80px 0 32px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

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

.footer-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.footer-logo svg {
  color: var(--accent-primary);
}

.footer-tagline {
  font-size: 15px;
  color: var(--text-secondary);
}

.footer-section h4 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-section a {
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-section a:hover {
  color: var(--accent-primary);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--border-color);
  font-size: 14px;
  color: var(--text-secondary);
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

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

/* 响应式设计 */
@media (max-width: 992px) {
  .nav-links {
    display: none;
  }

  .mobile-menu-toggle {
    display: flex;
  }

  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-visual {
    order: -1;
  }

  .hero-title {
    font-size: 42px;
  }

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

  .showcase-content {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

@media (max-width: 768px) {
  .nav-right .btn-primary {
    display: none;
  }

  .hero {
    padding: 80px 0 60px;
  }

  .hero-title {
    font-size: 36px;
  }

  .hero-description {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
  }

  .btn-large {
    width: 100%;
    justify-content: center;
  }

  .hero-stats {
    gap: 32px;
  }

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

  .section-title {
    font-size: 32px;
  }

  .showcase-title {
    font-size: 32px;
  }

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

  .download-title {
    font-size: 28px;
  }

  .download-buttons {
    flex-direction: column;
  }

  .download-btn {
    width: 100%;
    justify-content: center;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

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

  .card-1,
  .card-2 {
    display: none;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }

  .stat-value {
    font-size: 24px;
  }
}