/* ==========================================================================
   global.css
   Owns: reset, base element styling, typography defaults, the grid system,
   layout primitives (.container, .grid, .page), and global animation
   keyframes / scroll-reveal classes.
   Must NOT define component-specific styling (see components.css).
   Must NOT hardcode raw values — reference tokens.css only.
   ========================================================================== */

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

* {
  margin: 0;
}

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

body {
  background-color: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-sans);
  font-size: var(--text-base-size);
  line-height: var(--text-base-line);
  font-weight: var(--weight-regular);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

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

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

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

/* --- View Transitions (between-page morphing) ----------------------------- */
@view-transition {
  navigation: auto;
}

/* --- Typography utilities ------------------------------------------------- */
.t-label {
  font-size: var(--text-label-size);
  line-height: var(--text-label-line);
  font-weight: var(--weight-semibold);
  color: var(--color-muted);
}

.t-base {
  font-size: var(--text-base-size);
  line-height: var(--text-base-line);
}

.t-lg {
  font-size: var(--text-lg-size);
  line-height: var(--text-lg-line);
}

.t-serif-2xl {
  font-family: var(--font-serif);
  font-size: var(--text-2xl-size);
  line-height: var(--text-2xl-line);
  font-weight: var(--weight-regular);
}

.t-serif-3xl {
  font-family: var(--font-serif);
  font-size: var(--text-3xl-size);
  line-height: var(--text-3xl-line);
  font-weight: var(--weight-regular);
}

.t-serif-4xl {
  font-family: var(--font-serif);
  font-size: var(--text-4xl-size);
  line-height: var(--text-4xl-line);
  font-weight: var(--weight-regular);
}

.t-muted {
  color: var(--color-muted);
}

.t-semibold {
  font-weight: var(--weight-semibold);
}

.t-italic {
  font-style: italic;
}

/* --- Layout primitives ---------------------------------------------------- */

/* Centered page wrapper that enforces the max width + page margins. */
.container {
  width: 100%;
  max-width: var(--grid-max-width);
  margin-inline: auto;
  padding-inline: var(--grid-margin);
}

/* The 12-column grid. Children opt into spans via the .col-* helpers below.
   Collapses to 2 columns on tablet and 1 column on mobile. */
.grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-columns), 1fr);
  column-gap: var(--grid-gutter);
}

/* Column span helpers (desktop) */
.col-4 {
  grid-column: span 4;
}
.col-6 {
  grid-column: span 6;
}
.col-8 {
  grid-column: span 8;
}
.col-12 {
  grid-column: span 12;
}

/* Explicit start positions used by the asymmetric layouts in Figma. */
.start-5 {
  grid-column-start: 5;
}
.start-7 {
  grid-column-start: 7;
}
.start-9 {
  grid-column-start: 9;
}

/* --- Scroll-reveal + entrance animation ----------------------------------- */
/* Elements tagged .reveal start hidden; main.js adds .visible via a single
   IntersectionObserver, and the transition below does the work. */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity var(--duration-slow) var(--ease-out),
    transform var(--duration-slow) var(--ease-out);
  will-change: opacity, transform;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* Page-load stagger-fade. Apply .stagger to a container and .stagger-item to
   each child; --i sets the delay multiplier. */
@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* Slide in from the right; used for the hero headline + copy. */
@keyframes fade-in-right {
  from {
    opacity: 0;
    transform: translateX(48px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.stagger-item {
  opacity: 0;
  animation: fade-up var(--duration-entrance) var(--ease-settle) both;
  animation-delay: calc(var(--i, 0) * var(--stagger-step));
}

.stagger-item--from-right {
  animation-name: fade-in-right;
}

@media (prefers-reduced-motion: reduce) {
  .reveal,
  .reveal.visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .stagger-item {
    opacity: 1;
    animation: none;
  }

  html {
    scroll-behavior: auto;
  }
}

/* --- Responsive: tablet (2-col grid) -------------------------------------- */
@media (max-width: 1024px) {
  :root {
    --grid-margin: 48px;
  }

  .grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Every span collapses to fit within 2 columns. */
  .col-4,
  .col-6,
  .col-8,
  .col-12 {
    grid-column: span 2;
  }

  .start-5,
  .start-7,
  .start-9 {
    grid-column-start: auto;
  }

  .t-serif-4xl {
    font-size: 40px;
    line-height: 48px;
  }
}

/* --- Responsive: mobile (1-col grid) -------------------------------------- */
@media (max-width: 640px) {
  :root {
    --grid-margin: 24px;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .col-4,
  .col-6,
  .col-8,
  .col-12 {
    grid-column: span 1;
  }

  .t-serif-4xl {
    font-size: 32px;
    line-height: 40px;
  }
}