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

/* ==========================================================================
   CSS Variables (Design System)
   ========================================================================== */
:root {
  /* Brand Colors */
  --color-primary-accent: #BB86FC;
  --color-bg-base: #121112;
  --color-bg-surface: #1E1E1E;
  --color-text-primary: #E0E0E0;
  --color-text-secondary: #A0A0A0;
  --color-border-subtle: #333333;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout & Spacing */
  --container-max-width: 1200px;
  --spacing-unit: 1rem;
  --header-height: 80px;
  
  /* Transitions */
  --transition-speed: 0.3s;
}

/* ==========================================================================
   CSS Resets & Base Styles
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--color-bg-base);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  color: #FFFFFF;
  line-height: 1.2;
  font-weight: 600;
  margin-bottom: var(--spacing-unit);
}

a {
  color: var(--color-primary-accent);
  text-decoration: none;
  transition: opacity var(--transition-speed) ease;
}

a:hover {
  opacity: 0.8;
}

ul, ol {
  list-style: none;
}

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

.btn-primary {
  display: inline-block;
  background-color: var(--color-primary-accent);
  color: #000000; /* High contrast black text on light purple */
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  text-align: center;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-speed) ease, box-shadow var(--transition-speed) ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(187, 134, 252, 0.3);
  opacity: 1; /* override default a:hover opacity */
  color: #000000;
}

.mono-text {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* ==========================================================================
   Component: Header
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(18, 17, 18, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border-subtle);
  z-index: 1000;
  display: flex;
  align-items: center;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: -0.5px;
}

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

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

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

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

/* Responsive Header */
@media (max-width: 768px) {
  .main-nav {
    display: none; /* In Phase 3, we can add a hamburger menu toggle */
  }
}

/* ==========================================================================
   Component: Footer
   ========================================================================== */
.site-footer {
  background-color: var(--color-bg-surface);
  border-top: 1px solid var(--color-border-subtle);
  padding: 4rem 0 2rem;
  margin-top: 4rem;
}

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

.footer-col h3 {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  color: #FFFFFF;
}

.footer-col p, .footer-col a {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  display: block;
}

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

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border-subtle);
  color: var(--color-text-secondary);
  font-size: 0.85rem;
}

/* Responsive Footer */
@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 576px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}