:root {
  --font-primary: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);

  /* Light Theme */
  --bg-color-light: #f4f7fc;
  --bg-gradient-light: linear-gradient(120deg, #e0c3fc 0%, #8ec5fc 100%);
  --text-color-light: #0d1117;
  --heading-color-light: #0a0e13;
  --accent-color-light: #007bff;
  --card-bg-light: rgba(255, 255, 255, 0.25);
  --card-border-light: rgba(255, 255, 255, 0.4);
  --shadow-light: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
  --btn-bg-light: #ffffff;
  --btn-shadow-light-1: rgba(0, 0, 0, 0.1);
  --btn-shadow-light-2: rgba(255, 255, 255, 0.7);

  /* Dark Theme */
  --bg-color-dark: #0d1117;
  --bg-gradient-dark: linear-gradient(120deg, #2d3748 0%, #1a202c 100%);
  --text-color-dark: #c9d1d9;
  --heading-color-dark: #f0f6fc;
  --accent-color-dark: #58a6ff;
  --card-bg-dark: rgba(45, 55, 72, 0.25);
  --card-border-dark: rgba(255, 255, 255, 0.15);
  --shadow-dark: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
  --btn-bg-dark: #21262d;
  --btn-shadow-dark-1: rgba(0, 0, 0, 0.3);
  --btn-shadow-dark-2: rgba(255, 255, 255, 0.05);
}

[data-theme='light'] {
  --bg-color: var(--bg-color-light);
  --bg-gradient: var(--bg-gradient-light);
  --text-color: var(--text-color-light);
  --heading-color: var(--heading-color-light);
  --accent-color: var(--accent-color-light);
  --card-bg: var(--card-bg-light);
  --card-border: var(--card-border-light);
  --shadow: var(--shadow-light);
  --btn-bg: var(--btn-bg-light);
  --btn-shadow-1: var(--btn-shadow-light-1);
  --btn-shadow-2: var(--btn-shadow-light-2);
}

[data-theme='dark'] {
  --bg-color: var(--bg-color-dark);
  --bg-gradient: var(--bg-gradient-dark);
  --text-color: var(--text-color-dark);
  --heading-color: var(--heading-color-dark);
  --accent-color: var(--accent-color-dark);
  --card-bg: var(--card-bg-dark);
  --card-border: var(--card-border-dark);
  --shadow: var(--shadow-dark);
  --btn-bg: var(--btn-bg-dark);
  --btn-shadow-1: var(--btn-shadow-dark-1);
  --btn-shadow-2: var(--btn-shadow-dark-2);
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-primary);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  transition: background-color 0.3s var(--ease-out), color 0.3s var(--ease-out);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100vh;
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  z-index: -1;
  transition: background-image 0.3s var(--ease-out);
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1rem;
}

h1, h2, h3 {
  color: var(--heading-color);
  font-weight: 700;
  line-height: 1.2;
}

a { color: var(--accent-color); text-decoration: none; transition: color 0.2s ease; }
a:hover { color: var(--heading-color); }

/* Header & Nav */
.site-header {
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--card-border);
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.navbar-brand { font-size: 1.5rem; font-weight: 700; color: var(--heading-color); }
.nav-menu { display: flex; align-items: center; gap: 1.5rem; }
.nav-link { font-weight: 600; color: var(--text-color); }

/* Modern CTA Button */
.btn-cta {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: 0.5rem;
  border: 1px solid transparent;
  background: var(--btn-bg);
  color: var(--heading-color);
  box-shadow: 0 4px 6px -1px var(--btn-shadow-1), 0 2px 4px -1px var(--btn-shadow-2);
  transition: all 0.2s var(--ease-out);
}
.btn-cta:hover { transform: translateY(-2px); box-shadow: 0 10px 15px -3px var(--btn-shadow-1), 0 4px 6px -2px var(--btn-shadow-2); }
.btn-cta:active { transform: translateY(0); }
.btn-cta-large { font-size: 1.1rem; padding: 1rem 2rem; }

/* Dark Mode Toggle */
.theme-switch-wrapper { display: flex; align-items: center; }
.theme-switch { position: relative; display: inline-block; width: 50px; height: 26px; }
.theme-switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: #ccc; transition: .4s; }
.slider:before { position: absolute; content: ""; height: 20px; width: 20px; left: 3px; bottom: 3px; background-color: white; transition: .4s; }
input:checked + .slider { background-color: var(--accent-color); }
input:checked + .slider:before { transform: translateX(24px); }
.slider.round { border-radius: 34px; }
.slider.round:before { border-radius: 50%; }

/* Sections */
.hero-section { padding: 6rem 0; }
.hero-title { font-size: 3.5rem; margin-bottom: 1rem; }
.hero-subtitle { font-size: 1.25rem; max-width: 700px; margin: 0 auto 2rem; }
.features-section, .blog-preview-section { padding: 4rem 0; }
.section-header { margin-bottom: 3rem; }
.section-header h2 { font-size: 2.5rem; }
.section-header p { font-size: 1.1rem; color: var(--text-color); }

/* Glassmorphism Card */
.glass-card {
  background: var(--card-bg);
  backdrop-filter: blur(15px);
  -webkit-backdrop-filter: blur(15px);
  border: 1px solid var(--card-border);
  border-radius: 1rem;
  padding: 2rem;
  box-shadow: var(--shadow);
  transition: transform 0.3s var(--ease-out), box-shadow 0.3s var(--ease-out);
}
.glass-card:hover { transform: translateY(-5px); box-shadow: 0 12px 35px 0 rgba(0, 0, 0, 0.15); }

/* Features Grid */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; }
.feature-card { text-align: center; }
.feature-icon { margin-bottom: 1rem; color: var(--accent-color); }
.feature-title { font-size: 1.5rem; margin-bottom: 0.5rem; }

/* Blog Grid */
.blog-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(350px, 1fr)); gap: 2rem; }
.blog-card { padding: 0; overflow: hidden; }
.blog-card-img { width: 100%; height: 200px; object-fit: cover; display: block; }
.blog-card-content { padding: 1.5rem; }
.blog-card h3 { font-size: 1.25rem; }
.read-more { font-weight: 600; }

/* Footer */
.site-footer { padding-top: 3rem; margin-top: 4rem; background: var(--card-bg); border-top: 1px solid var(--card-border); }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 2rem; margin-bottom: 2rem; }
.footer-col h5 { font-size: 1.1rem; margin-bottom: 1rem; }
.footer-col p { opacity: 0.8; }
.list-unstyled { list-style: none; padding: 0; margin: 0; }
.list-unstyled li { margin-bottom: 0.5rem; }
.list-unstyled a { color: var(--text-color); }
.footer-bottom { text-align: center; padding: 1.5rem 0; border-top: 1px solid var(--card-border); opacity: 0.7; }

/* Legal & Contact Page */
.legal-section { padding: 4rem 0; }
.legal-section h1 { margin-bottom: 2rem; }
.legal-section h2 { margin-top: 2rem; }
.text-center { text-align: center; }
.text-muted { opacity: 0.7; }

/* Responsive */
@media (max-width: 768px) {
  .nav-menu { display: none; /* Simplification for this script; a real site would use a hamburger menu */ }
  .hero-title { font-size: 2.5rem; }
  .section-header h2 { font-size: 2rem; }
}