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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--bg-base);
  color: var(--text-primary);
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: var(--text-base);
  line-height: 1.6;
  transition: background-color var(--duration-base) var(--ease-out),
              color var(--duration-base) var(--ease-out);
}

img, video {
  max-width: 100%;
  height: auto;
  display: block;
}

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

a:hover { color: var(--accent-hover); }

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 600;
  color: var(--text-primary);
}

h1 { font-size: var(--text-hero); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }

p {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
}

p:last-child { margin-bottom: 0; }

ul, ol { padding-left: var(--space-6); }

li {
  margin-bottom: var(--space-2);
  color: var(--text-secondary);
}

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

::selection {
  background: var(--accent);
  color: var(--on-accent);
}

/* Scrollbar */
::-webkit-scrollbar          { width: 6px; }
::-webkit-scrollbar-track    { background: var(--bg-base); }
::-webkit-scrollbar-thumb    { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-secondary); }

/* Scroll-fade (triggered by IntersectionObserver in theme-toggle.js) */
/* Only hide when JS is confirmed running -- see the inline script in
   base.html. Unscoped, a script failure hides all page content forever. */
.js .fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}
.js .fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}