/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* CSS Variables - Modern SaaS Theme */
:root {
  /* Palette */
  --primary-color: #2563EB;       /* Royal Blue */
  --primary-hover: #1D4ED8;
  --secondary-color: #64748B;     /* Slate 500 */
  --dark-color: #0F172A;          /* Slate 900 */
  --light-color: #F8FAFC;         /* Slate 50 */
  --accent-color: #3B82F6;
  
  /* Backgrounds */
  --bg-color: #FFFFFF;
  --bg-off-white: #F1F5F9;
  --header-bg: rgba(255, 255, 255, 0.8);
  --footer-bg: #0F172A;
  --footer-text: #94A3B8;

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --heading-color: #1E293B;       /* Slate 800 */
  --text-color: #334155;          /* Slate 700 */

  /* Spacing & Layout */
  --container-width: 1200px;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  /* Borders & Shadows */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: var(--font-family);
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

main {
  flex: 1;
  width: 100%;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  color: var(--heading-color);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 3rem; letter-spacing: -0.025em; }
h2 { font-size: 2.25rem; letter-spacing: -0.025em; }
h3 { font-size: 1.5rem; }

/* Utilities */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.text-center { text-align: center; }
.text-gradient {
  background: linear-gradient(135deg, var(--primary-color), #8B5CF6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.section {
  padding: var(--spacing-xl) 0;
}

.bg-light { background-color: var(--bg-off-white); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  border-radius: 9999px; /* Pill shape */
  transition: all 0.2s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

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

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
  color: white;
  text-decoration: none;
  box-shadow: var(--shadow-lg);
}

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

.btn-outline:hover {
  background-color: var(--bg-off-white);
  text-decoration: none;
}

/* Header */
#site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--header-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--heading-color);
  letter-spacing: -0.05em;
}

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

.nav-links a {
  color: var(--text-color);
  font-weight: 500;
  font-size: 0.95rem;
}

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

/* Footer */
#site-footer {
  background-color: var(--footer-bg);
  color: var(--footer-text);
  padding: 4rem 0 2rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 4rem;
  margin-bottom: 3rem;
}

.footer-brand h3 {
  color: white;
  margin-bottom: 1rem;
}

.footer-col h4 {
  color: white;
  font-size: 1rem;
  margin-bottom: 1.5rem;
}

.footer-col a {
  display: block;
  color: var(--footer-text);
  margin-bottom: 0.8rem;
  transition: color 0.2s;
}

.footer-col a:hover {
  color: white;
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 2rem;
  text-align: center;
  font-size: 0.875rem;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.card {
  background: white;
  border-radius: var(--radius-lg);
  padding: 2rem;
  border: 1px solid #E2E8F0;
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

/* Animations */
.animate-fade-up {
  opacity: 0;
  animation: fadeUp 0.8s ease-out forwards;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive */
@media (max-width: 768px) {
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.75rem; }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .nav-links {
    display: none; /* Todo: Add mobile menu toggle */
  }
}

/* Markdown Prose Override */
.prose {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.125rem;
}
.prose h1, .prose h2 { margin-top: 2.5rem; }
.prose ul, .prose ol { padding-left: 1.5rem; margin-bottom: 1.5rem; }
.prose p { margin-bottom: 1.5rem; }