/* Design tokens */
:root {
  --color-ink: #1a1a1a;          /* Single source for all dark ink uses */
  --color-bg: #f9f7f4;
  --color-text: var(--color-ink);
  --color-text-muted: #4a4a4a;
  --color-accent: var(--color-ink);
  --color-btn-bg: var(--color-ink);
  --color-btn-text: #f9f7f4;
  --color-btn-hover-bg: #333;

  --font-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;

  --radius: 0.375rem;
  --radius-lg: 1rem;
  --max-width: 68rem;
}

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

/* Base */
html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-base);
  font-size: 1rem;
  line-height: 1.6;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-sm);
}

/* Main content */
main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
  width: 100%;
  max-width: var(--max-width);
  flex: 1;
  justify-content: center;
}

.hero {
  display: grid;
  grid-template-columns: 1fr;
  align-items: center;
  gap: clamp(1.5rem, 4vw, 4rem);
}

.hero-copy {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  text-align: center;
}

/* Header / tagline */
.site-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.profile-image-wrap {
  justify-self: center;
}

.profile-image {
  display: block;
  width: min(100%, 340px);
  height: auto;
  border-radius: var(--radius-lg);
}

.tagline {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.subtagline {
  color: var(--color-text-muted);
  font-size: 1.125rem;
}

/* App links */
.app-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}

.app-btn {
  display: inline-block;
  background-color: var(--color-btn-bg);
  color: var(--color-btn-text);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75rem 2rem;
  border-radius: var(--radius);
  transition: background-color 0.15s ease;
}

.app-btn:hover {
  background-color: var(--color-btn-hover-bg);
}

.app-btn:focus-visible {
  outline: 3px solid var(--color-bg);
  outline-offset: 2px;
  box-shadow: 0 0 0 5px var(--color-accent);
}

/* Footer */
.site-footer {
  padding-top: var(--space-md);
}

.social-links {
  display: flex;
  gap: var(--space-md);
  align-items: center;
  justify-content: center;
}

.social-link {
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  transition: color 0.15s ease;
}

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

.social-link:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Reduce motion */
@media (prefers-reduced-motion: reduce) {
  .app-btn,
  .social-link {
    transition: none;
  }
}

@media (min-width: 900px) {
  main {
    align-items: stretch;
  }

  .hero {
    grid-template-columns: minmax(0, 1fr) minmax(220px, 360px);
  }

  .hero-copy {
    text-align: left;
    gap: var(--space-lg);
  }

  .app-links {
    justify-content: flex-start;
  }

  .profile-image-wrap {
    justify-self: end;
  }
}