/* ===== NAVIGATION ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: transparent;
  transition: background-color var(--transition-base),
              backdrop-filter var(--transition-base);
}

.site-header.scrolled {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

[data-theme="light"] .site-header.scrolled,
[data-theme="system"] .site-header.scrolled {
  background: rgba(250, 250, 250, 0.85);
}

@media (prefers-color-scheme: light) {
  [data-theme="system"] .site-header.scrolled {
    background: rgba(250, 250, 250, 0.85);
  }
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--padding-x);
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
  position: relative;
  padding: var(--space-xs) 0;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}

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

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.theme-toggle {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  color: var(--text-secondary);
  padding: var(--space-xs);
  transition: color var(--transition-fast);
  line-height: 1;
}

.theme-toggle:hover {
  color: var(--accent);
}

.mobile-menu-toggle {
  display: none;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--text-secondary);
  padding: var(--space-xs);
}

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: var(--space-lg) var(--padding-x);
  z-index: 99;
}

.mobile-nav.open {
  display: block;
}

.mobile-nav a {
  display: block;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-secondary);
  padding: var(--space-sm) 0;
}

.mobile-nav a:hover,
.mobile-nav a.active {
  color: var(--accent);
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }

  .mobile-menu-toggle {
    display: block;
  }
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-xl) var(--padding-x);
}

.hero-content h1 {
  color: var(--text);
  margin-bottom: var(--space-sm);
}

.hero-tagline {
  font-family: var(--font-mono);
  font-size: clamp(0.875rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.hero-subtitle {
  font-family: var(--font-mono);
  font-size: clamp(0.75rem, 1.5vw, 1rem);
  color: var(--accent);
  letter-spacing: 0.1em;
}

.hero-subtitle span {
  color: var(--text-tertiary);
  margin: 0 0.5em;
}

.scroll-indicator {
  position: absolute;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  color: var(--text-tertiary);
  font-size: 1.5rem;
  animation: bounce 2s infinite;
}

.scroll-indicator.hidden {
  opacity: 0;
  pointer-events: none;
}

/* ===== ABOUT ===== */
.about {
  background: var(--bg-secondary);
}

.about .section-lead {
  font-size: clamp(1rem, 2vw, 1.125rem);
  max-width: 60ch;
}

.feature-card {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: var(--space-lg);
  transition: box-shadow var(--transition-base),
              border-color var(--transition-base);
}

.feature-card:hover {
  border-color: var(--accent-muted);
  box-shadow: var(--glow);
}

.feature-icon {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  color: var(--accent);
  margin-bottom: var(--space-md);
}

.feature-card h3 {
  color: var(--text);
}

.feature-card p {
  font-size: 0.9375rem;
}

/* Scroll reveal */
.feature-card {
  opacity: 0;
  transform: translateY(20px);
}

.feature-card.visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.feature-card:nth-child(2).visible {
  transition-delay: 0.1s;
}

.feature-card:nth-child(3).visible {
  transition-delay: 0.2s;
}

/* ===== CONTACT ===== */
.contact {
  text-align: center;
}

.contact-email {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: clamp(1rem, 3vw, 1.5rem);
  color: var(--accent);
  margin-top: var(--space-lg);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--accent-muted);
  border-radius: 4px;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast);
}

.contact-email:hover {
  background: var(--accent-dim);
  border-color: var(--accent);
}

.contact-noscript {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-tertiary);
  margin-top: var(--space-lg);
}

/* ===== FOOTER ===== */
.site-footer {
  border-top: 1px solid var(--border);
  padding: var(--space-lg) 0;
}

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

.footer-content p {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

.footer-content a {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--text-tertiary);
}

@media (prefers-reduced-motion: reduce) {
  .scroll-indicator {
    animation: none;
  }

  .feature-card {
    opacity: 1;
    transform: none;
  }
}