/* ========================================
   CSS Variables & Reset
   ======================================== */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --text-primary: #e8e8ec;
  --text-secondary: #7a7a85;
  --accent: #00f0ff;
  --divider: #2a2a35;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
}

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

/* Skip to Content link */
.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 9999;
  padding: 0.6rem 1.2rem;
  background: var(--accent);
  color: var(--bg-primary);
  font-size: 0.85rem;
  font-weight: 600;
  border-radius: 0 0 4px 4px;
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle noise texture overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.025;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

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

a:hover {
  opacity: 0.8;
}

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

/* ========================================
   Navigation
   ======================================== */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--divider);
  transition: background var(--transition-base);
}

.site-nav.scrolled {
  background: rgba(10, 10, 15, 0.95);
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-logo {
  width: 28px;
  height: 28px;
  object-fit: contain;
  border-radius: 4px;
}

.nav-brand:hover {
  opacity: 1;
  color: var(--accent);
}

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

.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width var(--transition-base);
}

.nav-links a:hover {
  color: var(--text-primary);
  opacity: 1;
}

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

.nav-links a.active {
  color: var(--text-primary);
  opacity: 1;
}

.nav-links a.active::after {
  width: 100%;
  background: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--text-primary);
  transition: var(--transition-base);
}

/* ========================================
   Section Base
   ======================================== */
.section {
  border-top: 1px solid var(--divider);
  padding: var(--space-xl) var(--space-md);
  position: relative;
  z-index: 2;
}

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
  line-height: 1.2;
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  border-top: 1px solid var(--divider);
  padding: var(--space-lg) var(--space-md);
  text-align: center;
  position: relative;
  z-index: 2;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.footer-inner p {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.footer-meta {
  margin-top: var(--space-xs);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(12px);
    padding: var(--space-md);
    gap: var(--space-sm);
    border-bottom: 1px solid var(--divider);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .section {
    padding: var(--space-lg) var(--space-md);
  }
}

/* ========================================
   Reduced Motion
   ======================================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}