/* Guide Education — Global reset + page defaults */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-surface);
  color: var(--color-on-surface);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition:
    background-color var(--duration-normal) var(--ease-out-expo),
    color var(--duration-normal) var(--ease-out-expo);
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-headline);
  color: var(--color-on-surface);
}

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

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--color-outline-variant);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--color-outline); }

:focus-visible {
  outline: 2px solid var(--color-on-surface);
  outline-offset: 2px;
  /* border-exception: focus */
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* === Semantic utilities (for elements with hover/focus state) === */

.link-muted {
  color: var(--color-on-surface-variant);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-out-expo);
}
.link-muted:hover { color: var(--color-on-surface); }

.surface-card {
  background-color: var(--color-surface-container-high);
  transition: background-color var(--duration-normal) var(--ease-out-expo);
}
.surface-card:hover { background-color: var(--color-surface-container-highest); }

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  transition: background-color var(--duration-fast) var(--ease-out-expo);
}
.btn-primary:hover { background-color: var(--color-primary-container); }

/* Theme toggle button: on-surface text with surface hover */
.icon-button {
  color: var(--color-on-surface);
  transition:
    background-color var(--duration-fast) var(--ease-out-expo);
}
.icon-button:hover { background-color: var(--color-surface-container); }

/* Large featured card with subtle surface lift on hover */
.featured-card {
  background-color: var(--color-surface-container-highest);
  transition: background-color var(--duration-normal) var(--ease-out-expo);
}
.featured-card:hover { background-color: var(--color-surface-container); }

/* Theme-reactive icon visibility (replaces Tailwind dark:inline / dark:hidden) */
.icon-light { display: none; }
.icon-dark { display: inline; }
html.dark .icon-light { display: inline; }
html.dark .icon-dark { display: none; }