/**
 * AX Atlas — Base styles (reset + typography + layout primitives)
 */

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-base);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'cv11', 'ss01', 'ss03';
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 0;
}

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

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

h1, h2, h3, h4, h5, h6, p { margin: 0; }

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

/* ── Layout primitives ── */

.container {
  max-width: var(--container-base);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container.narrow { max-width: var(--container-narrow); }
.container.wide { max-width: var(--container-wide); }

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

/* ── Typography utilities ── */

.eyebrow {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-accent);
}

.display {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
  color: var(--color-text);
}

.lead {
  font-size: var(--text-lg);
  line-height: var(--leading-relaxed);
  color: var(--color-text-muted);
  max-width: 56ch;
}

/* ── Buttons ── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 44px;
  padding-inline: var(--space-5);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: -0.005em;
  border-radius: var(--radius-md);
  transition: background var(--duration-fast) var(--ease-out-quart),
              color var(--duration-fast) var(--ease-out-quart),
              border-color var(--duration-fast) var(--ease-out-quart),
              transform var(--duration-fast) var(--ease-out-quart);
  white-space: nowrap;
}
.btn:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-text);
  color: var(--color-bg);
}
.btn-primary:hover {
  background: var(--color-accent-strong);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border-strong);
}
.btn-secondary:hover {
  border-color: var(--color-text);
  background: var(--color-bg-subtle);
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  padding-inline: var(--space-3);
}
.btn-ghost:hover {
  color: var(--color-text);
}

.btn-arrow::after {
  content: '→';
  display: inline-block;
  transition: transform var(--duration-fast) var(--ease-out-quart);
}
.btn-arrow:hover::after {
  transform: translateX(3px);
}

/* ── Reveal-on-scroll (CSS only via IntersectionObserver in JS) ── */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}