/* ==========================================================================
   layout.css — Base body, containers, grid, sections, utilities
   aiengineer.hu — mobile-first
   ========================================================================== */

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
  overflow-x: hidden;
}

/* ---- Typography base ---- */
h1 {
  font-size: var(--text-4xl);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
}
h2 {
  font-family: var(--font-editorial-serif);
  font-size: var(--text-2xl);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-snug);
}
h3 { font-size: var(--text-xl); }
h4 {
  font-size: var(--text-lg);
  font-family: var(--font-display-mono);
  font-weight: 400;
  letter-spacing: var(--tracking-wide);
}

a {
  color: var(--accent-primary);
  transition: color var(--transition-fast);
}

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

strong {
  color: var(--text-primary);
  font-weight: var(--font-semibold);
}

code {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

:target {
  scroll-margin-top: calc(var(--nav-height) + var(--space-6));
}

/* ---- Focus visibility (a11y) ---- */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

:focus:not(:focus-visible) {
  outline: none;
}

/* ---- Container ---- */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

@media (min-width: 640px) {
  .container {
    padding-inline: var(--space-6);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--space-8);
  }
}

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

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

/* ---- Section spacing ---- */
.section {
  padding-block: var(--space-16);
}

@media (min-width: 1024px) {
  .section {
    padding-block: var(--space-24);
  }
}

.section__header {
  text-align: left;
  max-width: var(--container-md);
  margin-inline: 0;
  margin-bottom: var(--space-12);
}

.section__title {
  font-family: var(--font-editorial-serif);
  font-size: var(--text-3xl);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-3);
  line-height: var(--leading-snug);
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

.section__eyebrow {
  display: inline-block;
  font-family: var(--font-display-mono);
  font-size: var(--text-xs);
  font-weight: var(--font-normal);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--accent-primary);
  margin-bottom: var(--space-3);
}

/* ---- Grid helpers ---- */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: 1fr; }

@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* ---- Dot-grid background pattern ---- */
.dot-grid {
  background-image: radial-gradient(circle, var(--surface-border) 1px, transparent 1px);
  background-size: 24px 24px;
}

/* ---- Utility ---- */
.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;
}

.text-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.text-center { text-align: center; }
.text-muted { color: var(--text-secondary); }

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

/* ---- Main content baseline ---- */
main {
  display: block;
}

/* Prevent layout shift for sticky footer feel on short pages */
.page-wrap {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.page-wrap > main {
  flex: 1 0 auto;
}