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

:root {
  /* 亮色主题（默认） */
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #f1f3f4;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-muted: #888888;
  --border-color: rgba(0, 0, 0, 0.1);
  --navbar-bg: rgba(255, 255, 255, 0.95);
  --card-bg: rgba(255, 255, 255, 0.8);
  --card-border: rgba(0, 0, 0, 0.1);
  --card-hover-border: rgba(0, 122, 204, 0.3);
  --card-hover-shadow: rgba(0, 122, 204, 0.1);
  --accent-color: #007acc;
  --accent-hover: #005a9d;
  --hero-gradient: radial-gradient(
    ellipse at center,
    rgba(0, 122, 204, 0.1) 0%,
    transparent 70%
  );
  --scrollbar-track: #f1f1f1;
  --scrollbar-thumb: #c1c1c1;
  --scrollbar-thumb-hover: #a8a8a8;
}

[data-theme="dark"] {
  /* 暗黑主题 */
  --bg-primary: #000000;
  --bg-secondary: rgba(255, 255, 255, 0.02);
  --bg-tertiary: rgba(255, 255, 255, 0.05);
  --text-primary: #ffffff;
  --text-secondary: #a0a0a0;
  --text-muted: #666666;
  --border-color: rgba(255, 255, 255, 0.1);
  --navbar-bg: rgba(0, 0, 0, 0.95);
  --card-bg: rgba(255, 255, 255, 0.05);
  --card-border: rgba(255, 255, 255, 0.1);
  --card-hover-border: rgba(0, 122, 204, 0.5);
  --card-hover-shadow: rgba(0, 122, 204, 0.1);
  --accent-color: #007acc;
  --accent-hover: #005a9d;
  --hero-gradient: radial-gradient(
    ellipse at center,
    rgba(0, 122, 204, 0.1) 0%,
    transparent 70%
  );
  --scrollbar-track: #000000;
  --scrollbar-thumb: #333333;
  --scrollbar-thumb-hover: #555555;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}
a {
  color: var(--text-primary);
  text-decoration: none;
}
/* Navigation */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--navbar-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  padding: 1rem 0;
  transition: background-color 0.3s ease;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo-icon {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
}

.nav-link:hover {
  color: var(--accent-color);
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-color);
  transition: width 0.2s ease;
}

.nav-link:hover::after {
  width: 100%;
}

/* Theme Toggle Button */
.theme-toggle {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
  margin-left: 1rem;
}

.theme-toggle:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-color);
  transform: scale(1.05);
}

.theme-icon {
  font-size: 1.2rem;
  transition: transform 0.3s ease;
}

.theme-toggle:hover .theme-icon {
  transform: rotate(20deg);
}

/* Main Content */
.main-content {
  margin-top: 80px;
}

/* Hero Section */
.hero {
  padding: 6rem 0 8rem;
  text-align: center;
  background: var(--hero-gradient);
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.hero-title {
  font-size: 4rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  background: linear-gradient(
    135deg,
    var(--text-primary) 0%,
    var(--accent-color) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.875rem 2rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-color);
  color: #ffffff;
  border-color: var(--accent-color);
}

.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(0, 122, 204, 0.3);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-tertiary);
  border-color: var(--accent-color);
  transform: translateY(-2px);
}

/* Features Section */
.features {
  padding: 6rem 0;
  /* background: var(--bg-secondary); */
}
.features.vb6mini {
  background: var(--bg-secondary);
}
.features.ide {
  background: var(--bg-secondary);
}
.features.hexin {
  background: var(--bg-secondary);
}
.bg-second {
  background: var(--bg-secondary);
}
.center {
  text-align: center;
}
img {
  max-width: 100%;
}

.features-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 4rem;
  color: var(--text-primary);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 2rem;
}

.feature-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 2.5rem;
  text-align: center;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: var(--card-hover-border);
  box-shadow: 0 20px 40px var(--card-hover-shadow);
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  display: block;
}

.feature-card h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

.feature-link {
  color: var(--accent-color);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s ease;
}

.feature-link:hover {
  color: var(--text-primary);
}

/* Tools Section */
.tools {
  padding: 6rem 0;
}
.tools.mini {
  background: var(--bg-secondary);
}

.tools-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 3rem;
}

.tool-category h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  color: var(--accent-color);
}

.tool-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.tool-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem;
  background: var(--card-bg);
  border-radius: 8px;
  border: 1px solid var(--card-border);
  transition: all 0.2s ease;
}

.tool-item:hover {
  background: var(--bg-tertiary);
  border-color: var(--card-hover-border);
}

.tool-name {
  font-weight: 600;
  color: var(--text-primary);
}

.tool-desc {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Community Section */
.community {
  padding: 6rem 0;
  background: var(--bg-secondary);
  text-align: center;
}

.community-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.community-desc {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.community-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

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

.stat-number {
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent-color);
  margin-bottom: 0.5rem;
}

.stat-label {
  font-size: 1.125rem;
  color: var(--text-secondary);
}

/* CTA Section */
.cta {
  padding: 6rem 0;
  text-align: center;
  /* background: var(--bg-secondary); */
}

.cta-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.cta-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 2rem;
  color: var(--text-primary);
}

.cta-buttons {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.cta-logo img {
  width: 64px;
  height: 64px;
  border-radius: 12px;
  opacity: 0.7;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 2rem;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h4 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.footer-section a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  margin-bottom: 0.5rem;
  transition: color 0.2s ease;
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-left {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-left span,
.footer-left a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
}

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

.footer-right {
  display: flex;
  gap: 1rem;
}

.footer-social {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  transition: color 0.2s ease;
}

.footer-social:hover {
  color: var(--accent-color);
}

/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    padding: 0 1rem;
  }

  .nav-links {
    gap: 1rem;
  }

  .theme-toggle {
    margin-left: 0.75rem;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

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

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

  .feature-card {
    padding: 2rem;
  }

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

  .community-stats {
    grid-template-columns: 1fr;
  }

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

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

  .hero-content,
  .features-container,
  .tools-container,
  .community-container,
  .cta-container {
    padding: 0 1rem;
  }
}

@media (max-width: 480px) {
  .nav-links {
    display: none;
    gap: 1rem;
  }

  .theme-toggle {
    margin-left: 0.5rem;
    width: 36px;
    height: 36px;
  }

  .theme-icon {
    font-size: 1rem;
  }

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

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

/* Smooth animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.feature-card,
.tool-category,
.stat-item {
  animation: fadeInUp 0.6s ease forwards;
}

.feature-card:nth-child(1) {
  animation-delay: 0.1s;
}
.feature-card:nth-child(2) {
  animation-delay: 0.2s;
}
.feature-card:nth-child(3) {
  animation-delay: 0.3s;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}