:root {
  --color-bg: #0f0f1a;
  --color-surface: rgba(255, 255, 255, 0.06);
  --color-surface-hover: rgba(255, 255, 255, 0.1);
  --color-border: rgba(255, 255, 255, 0.1);
  --color-text: #f0f0f5;
  --color-text-secondary: rgba(255, 255, 255, 0.55);
  --color-accent: #818cf8;
  --color-accent-secondary: #f472b6;
  --max-width: 48rem;
  --radius: 1rem;
  --blur: 16px;
}

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

body {
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(244, 114, 182, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(56, 189, 248, 0.1) 0%, transparent 50%);
  z-index: -1;
  animation: drift 20s ease-in-out infinite alternate;
}

@keyframes drift {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-2%, 2%) rotate(3deg); }
}

/* Header */
.site-header {
  padding: 1.5rem 2rem;
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header nav {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  gap: 2rem;
  align-items: center;
}

.nav-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  letter-spacing: 0.02em;
  padding: 0.4rem 0.8rem;
  border-radius: 0.5rem;
  transition: color 0.2s, background 0.2s;
}

.nav-link:hover {
  color: var(--color-text);
  background: var(--color-surface-hover);
}

/* Main content */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 4rem 2rem;
  flex: 1;
}

/* Hero */
.hero {
  padding: 4rem 0 2rem;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  letter-spacing: -0.03em;
}

.highlight {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  max-width: 32rem;
}

/* Pages */
.page h1 {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.page p {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
}

/* Glass card utility */
.glass {
  background: var(--color-surface);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: background 0.2s, border-color 0.2s;
}

.glass:hover {
  background: var(--color-surface-hover);
  border-color: rgba(255, 255, 255, 0.15);
}

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

.social-links {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  margin-bottom: 0.75rem;
}

.social-link {
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: 0.4rem 0.8rem;
  border-radius: 0.5rem;
  transition: color 0.2s, background 0.2s;
}

.social-link:hover {
  color: var(--color-accent);
  background: var(--color-surface-hover);
}

/* Responsive */
@media (max-width: 640px) {
  .hero h1 { font-size: 2.25rem; }
  .page h1 { font-size: 1.75rem; }
  .container { padding: 2.5rem 1.25rem; }
  .hero { padding: 2rem 0 1rem; }
}