/* Root Variables */
:root {
  /* Colors */
  --primary: #1e90ff;
  --secondary: #ff6b6b;
  --bg-dark: #1a1a1a;
  --bg-light: #ffffff;
  --text-dark: #f5f5f5;
  --text-light: #2d2d2d;
  --accent-gradient: linear-gradient(45deg, var(--primary), var(--secondary));
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  --backdrop-blur: blur(12px);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  /* Typography */
  --font-family: 'Inter', system-ui, sans-serif;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 2rem;
  --font-size-2xl: 3rem;
  --line-height: 1.65;
}

/* Global Reset */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

/* Base Styles */
body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height);
  background: var(--bg-dark);
  color: var(--text-dark);
  transition: background 0.3s ease, color 0.3s ease;
}

body.light {
  background: var(--bg-light);
  color: var(--text-light);
}

/* Layout */
.container {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-sm);
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: var(--backdrop-blur);
  padding: var(--space-sm) 0;
  z-index: 1000;
  box-shadow: var(--shadow);
}

body.light .navbar {
  background: rgba(255, 255, 255, 0.85);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.logo {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.logo:hover {
  color: var(--secondary);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-md);
}

.nav-links a {
  color: var(--text-dark);
  font-weight: 500;
  text-decoration: none;
  transition: color 0.2s ease;
}

body.light .nav-links a {
  color: var(--text-light);
}

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

.theme-toggle {
  background: none;
  border: none;
  font-size: var(--font-size-lg);
  color: var(--text-dark);
  cursor: pointer;
  transition: color 0.2s ease;
}

body.light .theme-toggle {
  color: var(--text-light);
}

/* Hero Section */
.hero {
  text-align: center;
  padding: var(--space-xl) 0;
  background: var(--accent-gradient);
  color: var(--text-dark);
  animation: fadeIn 1s ease-out;
}

.hero h1 {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  margin-bottom: var(--space-sm);
}

.hero p {
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin: 0 auto var(--space-md);
  opacity: 0.9;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--space-xs) var(--space-md);
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.btn-primary:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow);
}

/* Sections */
.features-preview,
.features,
.setup,
.usage,
.author {
  padding: var(--space-lg) 0;
}

.features-preview h2,
.features h1,
.setup h1,
.usage h1,
.author h2 {
  text-align: center;
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--space-md);
}

/* Feature Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.feature-card {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: var(--space-md);
  text-align: center;
  transition: transform 0.3s ease, background 0.2s ease;
}

body.light .feature-card {
  background: rgba(0, 0, 0, 0.06);
}

.feature-card:hover {
  transform: translateY(-8px);
  background: rgba(255, 255, 255, 0.12);
}

.feature-card img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: var(--space-sm);
}

/* Feature List */
.feature-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.feature-item {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: var(--space-md);
}

body.light .feature-item {
  background: rgba(0, 0, 0, 0.06);
}

.feature-item img {
  width: 100%;
  max-height: 200px;
  object-fit: cover;
  border-radius: 8px;
  margin-top: var(--space-sm);
}

/* Setup and Usage */
.setup ul,
.usage ul {
  list-style: disc;
  margin: var(--space-sm) 0 var(--space-md) var(--space-md);
}

.setup ol {
  margin: var(--space-sm) 0 var(--space-md) var(--space-md);
}

.setup code,
.usage code {
  background: rgba(255, 255, 255, 0.1);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-family: 'Fira Code', monospace;
}

/* Author Section */
.author-content {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  background: rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: var(--space-md);
}

body.light .author-content {
  background: rgba(0, 0, 0, 0.06);
}

.author-img {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--primary);
}

/* Footer */
.footer {
  text-align: center;
  padding: var(--space-md) 0;
  background: rgba(0, 0, 0, 0.6);
}

body.light .footer {
  background: rgba(0, 0, 0, 0.08);
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .navbar .container {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .nav-links {
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
  }

  .hero h1 {
    font-size: var(--font-size-xl);
  }

  .hero p {
    font-size: var(--font-size-base);
  }

  .author-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container {
    padding-inline: var(--space-xs);
  }

  .hero {
    padding: var(--space-lg) 0;
  }

  .feature-card img {
    height: 120px;
  }
}