:root {
  --color-bg: hsl(240, 16%, 5%);
  --color-grid: hsla(240, 16%, 15%, 0.15);
  --color-text-primary: hsl(0, 0%, 94%);
  --color-text-secondary: hsl(240, 5%, 68%);
  --color-text-muted: hsl(240, 5%, 52%);
  --color-accent: hsl(212, 28%, 64%);

  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace;

  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: 4px;
}

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

html, body {
  height: 100%;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}

.noise-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  pointer-events: none;
  opacity: 0.015;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

.bg-effects-container {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.grid-pattern {
  position: absolute;
  inset: 0;
  background-size: 50px 50px;
  background-image:
    linear-gradient(to right, var(--color-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--color-grid) 1px, transparent 1px);
  mask-image: radial-gradient(circle at center, black 30%, transparent 85%);
  -webkit-mask-image: radial-gradient(circle at center, black 30%, transparent 85%);
}

.ambient-glow-1 {
  position: absolute;
  width: 750px;
  height: 750px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, hsla(212, 28%, 64%, 0.035) 0%, transparent 70%);
  filter: blur(50px);
}

.ambient-glow-2 {
  position: absolute;
  width: 900px;
  height: 900px;
  left: 48%;
  top: 45%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, hsla(270, 80%, 60%, 0.018) 0%, transparent 75%);
  filter: blur(80px);
}

.cursor-glow {
  position: fixed;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, hsla(212, 28%, 64%, 0.04) 0%, transparent 70%);
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 2;
  opacity: 0;
  transition: opacity 0.8s ease;
  will-change: transform;
}

main {
  position: relative;
  z-index: 10;
  width: 100%;
  max-width: 620px;
  padding: 3rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-top: -15px;
}

h1 {
  font-size: 2.85rem;
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.1;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
  opacity: 0;
  transform: translateY(12px);
  animation: easeFadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) 0.12s forwards;
}

.subtitle {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-accent);
  letter-spacing: 0.01em;
  margin-bottom: 1.75rem;
  opacity: 0;
  transform: translateY(12px);
  animation: easeFadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) 0.24s forwards;
}

.divider {
  width: 40px;
  height: 1px;
  background-color: var(--color-text-muted);
  margin: 1.75rem auto;
  opacity: 0;
  animation: easeFadeIn 1.5s ease 0.36s forwards;
}

.tagline {
  font-size: 1.22rem;
  font-weight: 300;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 0.75rem;
  opacity: 0;
  transform: translateY(12px);
  animation: easeFadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) 0.48s forwards;
}

.focus-areas {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 3.5rem;
  opacity: 0;
  transform: translateY(12px);
  animation: easeFadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) 0.6s forwards;
}

.focus-separator {
  color: hsla(240, 16%, 22%, 0.7);
  margin: 0 0.4rem;
}

nav {
  opacity: 0;
  transform: translateY(12px);
  animation: easeFadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) 0.72s forwards;
}

.nav-list {
  display: flex;
  justify-content: center;
  gap: 1rem;
  list-style: none;
}

.nav-item {
  display: inline-flex;
  align-items: center;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 500;
  color: hsl(240, 5%, 75%);
  text-decoration: none;
  padding: 0.6rem 1.25rem;
  border: 1px solid hsla(240, 16%, 24%, 0.7);
  border-radius: 6px;
  background-color: hsla(240, 16%, 8%, 0.4);
  transition: var(--transition-smooth);
}

.nav-link:hover {
  color: var(--color-text-primary);
  border-color: hsla(212, 28%, 64%, 0.35);
  background-color: hsla(212, 28%, 64%, 0.05);
  transform: translateY(-1px);
}

@keyframes easeFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 2.2rem;
  }
  .tagline {
    font-size: 1.08rem;
  }
  .focus-areas {
    font-size: 0.78rem;
    margin-bottom: 2.5rem;
  }
  .nav-list {
    flex-direction: column;
    gap: 0.75rem;
    width: 100%;
    max-width: 280px;
  }
  .nav-item {
    width: 100%;
  }
  .nav-link {
    width: 100%;
    text-align: center;
  }
}