/* ==========================================================================
   styles.css — Reset, base elements, layout primitives
   Load order: variables.css → styles.css → components.css → animations.css
   → responsive.css
   ========================================================================== */

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

* {
  margin: 0;
}

html {
  scroll-behavior: smooth;
  /* Offset in-page anchors so the fixed nav doesn't cover section headings */
  scroll-padding-top: var(--nav-height);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  color: var(--text-strong);
  background-color: var(--surface-page);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

img,
picture,
svg {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

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

button {
  cursor: pointer;
  background: none;
  border: none;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  line-height: var(--lh-tight);
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

ul,
ol {
  list-style: none;
  padding: 0;
}

/* ---- Accessibility helpers -------------------------------------------- */
.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100%;
  z-index: calc(var(--z-nav) + 10);
  background: var(--color-accent);
  color: var(--color-white);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-weight: var(--fw-semibold);
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: var(--space-4);
}

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

/* Consistent, visible focus states across interactive elements */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---- Layout primitives ------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.section {
  padding-block: var(--space-20);
}

.section--muted {
  background-color: var(--surface-muted);
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-12);
}

.section__title {
  font-size: var(--fs-section);
  font-weight: var(--fw-bold);
  color: var(--text-strong);
}

.section__subtitle {
  margin-top: var(--space-3);
  font-size: var(--fs-lg);
  color: var(--text-muted);
}

/* Utility: grid helpers reused by several sections */
.grid {
  display: grid;
  gap: var(--space-6);
}