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

[hidden] { display: none !important; }

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-300);
  line-height: var(--line-body);
  color: var(--color-text);
  background: var(--color-base);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  line-height: var(--line-tight);
  margin: 0 0 var(--space-4);
  color: var(--color-text);
  letter-spacing: -0.01em;
}

h1 { font-size: var(--fs-800); letter-spacing: -0.02em; }
h2 { font-size: var(--fs-700); }
h3 { font-size: var(--fs-500); }
h4 { font-size: var(--fs-400); }

p { margin: 0 0 var(--space-4); max-width: 60ch; }

a {
  color: var(--color-accent);
  text-underline-offset: 0.18em;
  text-decoration-thickness: 0.06em;
}
a:hover { text-decoration-thickness: 0.12em; }

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.95em;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 0.18rem solid var(--color-focus);
  outline-offset: 0.18rem;
  border-radius: var(--radius-1);
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-components);
  color: var(--color-base);
  border-radius: var(--radius-2);
  transform: translateY(-200%);
  transition: transform var(--motion-fast) var(--easing);
  z-index: 100;
}
.skip-link:focus { transform: translateY(0); }

main {
  flex: 1;
  width: 100%;
  display: flex;
  flex-direction: column;
}
main:focus { outline: none; }

.site-header {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-base);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text);
  text-decoration: none;
}
.wordmark-logo {
  display: inline-block;
  width: 11rem;
  height: 1.4rem;
  background: currentColor;
  -webkit-mask: url("../assets/dmi-logo.svg") no-repeat left center / contain;
          mask: url("../assets/dmi-logo.svg") no-repeat left center / contain;
}
.wordmark-suffix {
  font-family: var(--font-mono);
  font-size: var(--fs-100);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.site-nav { flex: 1; }

.site-footer {
  padding: var(--space-5) var(--space-6);
  border-top: 1px solid var(--color-border);
  font-size: var(--fs-200);
  color: var(--color-text-muted);
}
.site-footer p { margin: 0; }
.site-footer a { color: inherit; }

.session-badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: var(--fs-100);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem var(--space-3);
  border-radius: var(--radius-pill);
  background: var(--color-accent);
  color: var(--color-accent-contrast);
  white-space: nowrap;
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--color-border-strong);
  color: var(--color-text);
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-pill);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: background var(--motion-fast) var(--easing);
}
.theme-toggle:hover { background: var(--color-elevation); }

@media (max-width: 48rem) {
  .site-header { padding: var(--space-3) var(--space-4); gap: var(--space-3); }
  h1 { font-size: var(--fs-700); }
  h2 { font-size: var(--fs-600); }
}