/* ============================================================
   M&S Tech Media — Base styles & editorial utilities
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  margin: 0 0 var(--space-4);
}

h1 { font-size: var(--text-h1); }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }

p { margin: 0 0 var(--space-4); }
a { color: var(--color-ink); text-decoration: none; }
a:hover { color: var(--color-accent); }

img { max-width: 100%; height: auto; display: block; }
ul, ol { margin: 0; padding: 0; }
figure { margin: 0; }
button { font-family: inherit; cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: var(--space-4);
  top: -100px;
  z-index: 1000;
  background: var(--color-ink);
  color: #fff;
  padding: var(--space-2) var(--space-4);
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: var(--space-4); color: #fff; }

/* ------------------------------------------------------------
   Layout
   ------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.container-wide {
  width: 100%;
  max-width: var(--container-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}
.section { padding-block: var(--space-20); }
.section--tight { padding-block: var(--space-12); }
.section--flush { padding-block: 0; }

/* Section surfaces */
.section--paper { background: var(--color-paper); }
.section--paper-2 { background: var(--color-paper-2); }
.section--white { background: var(--color-white); }
.section--dark { background: var(--color-ink); color: #fff; }
.section--dark h1, .section--dark h2, .section--dark h3, .section--dark h4 { color: #fff; }
.section--dark .eyebrow { color: var(--color-red); }
.section--blue { background: var(--color-accent); color: #fff; }
.section--blue h1, .section--blue h2, .section--blue h3, .section--blue h4 { color: #fff; }

/* Keep adjacent dark bands visually distinct */
.section--dark + .section--dark { border-top: 1px solid rgba(255, 255, 255, 0.12); }

/* ------------------------------------------------------------
   Editorial typography
   ------------------------------------------------------------ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin: 0 0 var(--space-4);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--color-red);
}

.display {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, var(--text-display));
  font-weight: 700;
  line-height: 0.98;
  letter-spacing: -0.035em;
  color: var(--color-ink);
  margin: 0 0 var(--space-6);
}

.lede {
  font-size: var(--text-xl);
  line-height: 1.45;
  color: var(--color-muted);
  max-width: 640px;
}

.serif-accent { color: var(--color-accent); }
.red-accent { color: var(--color-red); }

/* ------------------------------------------------------------
   Buttons
   ------------------------------------------------------------ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-sm);
  line-height: 1;
  padding: 15px 26px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
    border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }

.btn--solid { background: var(--color-ink); color: #fff; }
.btn--solid:hover { background: var(--color-accent); color: #fff; }

.btn--accent { background: var(--color-accent); color: #fff; }
.btn--accent:hover { background: var(--color-accent-dark); color: #fff; }

.btn--outline { background: transparent; color: var(--color-ink); border-color: var(--color-border-strong); }
.btn--outline:hover { border-color: var(--color-ink); color: var(--color-ink); }

.btn--light { background: #fff; color: var(--color-ink); }
.btn--light:hover { background: var(--color-paper); color: var(--color-ink); }

.btn--lg { padding: 18px 32px; font-size: var(--text-body); }

/* ------------------------------------------------------------
   Grids — varied, not repetitive
   ------------------------------------------------------------ */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-16);
  align-items: center;
}
.split--wide-left { grid-template-columns: 1.4fr 1fr; }
.split--wide-right { grid-template-columns: 1fr 1.4fr; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-8); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-8); }

/* ------------------------------------------------------------
   Reveal on scroll
   ------------------------------------------------------------ */
[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
  * { scroll-behavior: auto !important; }
}

/* ------------------------------------------------------------
   Responsive
   ------------------------------------------------------------ */
@media (max-width: 900px) {
  :root { --text-display: 52px; --text-h1: 42px; --text-h2: 34px; }
  .split, .split--wide-left, .split--wide-right { grid-template-columns: 1fr; gap: var(--space-8); }
  .grid-3, .grid-4 { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .section { padding-block: var(--space-12); }
  .display { font-size: 2.35rem; }
}