/* ============================================================================
   BASE — reset, element defaults, typography, layout primitives, utilities.
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--s-6));
}

body {
  margin: 0;
  background: var(--surface);
  color: var(--text);
  font-family: var(--cn-font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: var(--fw-reg);
  letter-spacing: var(--tr-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body.is-locked { overflow: hidden; }

/* ── Headings ────────────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--s-4);
  font-family: var(--cn-font-display);
  font-weight: var(--fw-bold);
  line-height: var(--lh-snug);
  letter-spacing: var(--tr-heading);
  text-wrap: balance;
}

h1 { font-size: var(--fs-h1); line-height: var(--lh-tight); letter-spacing: var(--tr-display); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); letter-spacing: -0.014em; }
h4 { font-size: var(--fs-h4); font-weight: var(--fw-semi); letter-spacing: -0.008em; }

p { margin: 0 0 var(--s-5); }
p:last-child { margin-bottom: 0; }

/* ── Links ───────────────────────────────────────────────────────────────── */
a {
  color: var(--link);
  text-decoration: none;
  text-underline-offset: 0.22em;
  text-decoration-thickness: 1px;
  transition: color var(--dur-1) var(--ease-out);
}
a:hover { text-decoration: underline; }

/* ── Media ───────────────────────────────────────────────────────────────── */
img, svg, video, canvas, picture {
  display: block;
  max-width: 100%;
  height: auto;
}

/* ── Forms ───────────────────────────────────────────────────────────────── */
button, input, select, textarea {
  font: inherit;
  color: inherit;
  letter-spacing: inherit;
}
button { background: none; border: 0; cursor: pointer; }

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: var(--s-9) 0;
}

ul, ol { margin: 0 0 var(--s-5); padding-left: 1.25em; }
li { margin-bottom: var(--s-2); }
li:last-child { margin-bottom: 0; }

figure { margin: 0; }
blockquote { margin: 0; }

table { border-collapse: collapse; width: 100%; }

::selection { background: var(--cn-accent); color: var(--cn-ink-deep); }

/* ── Focus — visible, never removed ──────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--cn-accent);
  outline-offset: 3px;
  border-radius: var(--r-xs);
}
:focus:not(:focus-visible) { outline: none; }

/* ── Skip link ───────────────────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  left: var(--s-4);
  top: -100px;
  z-index: 999;
  padding: var(--s-3) var(--s-5);
  background: var(--cn-accent);
  color: var(--cn-ink-deep);
  font-weight: var(--fw-semi);
  border-radius: var(--r-sm);
  transition: top var(--dur-2) var(--ease-out);
}
.skip-link:focus { top: var(--s-4); text-decoration: none; }

/* ── Screen-reader only ──────────────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ============================================================================
   LAYOUT PRIMITIVES
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--wide { max-width: var(--container-wide); }
.container--text { max-width: calc(var(--container-text) + var(--gutter) * 2); }

.section { padding-block: var(--section-y); position: relative; }
.section--lg    { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--section-y-tight); }
.section--flush-top { padding-top: 0; }
.section--flush-bottom { padding-bottom: 0; }

/* ── The editorial asymmetric grid ───────────────────────────────────────────
   12 columns with a wide gutter. Section intros deliberately sit off-centre:
   heading in columns 1–6, supporting copy in 8–12. That offset is the single
   most recognisable trait of the reference design language.
   ────────────────────────────────────────────────────────────────────────── */
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1.5rem, 0.8rem + 2.4vw, 3rem);
}

.grid--gap-sm { gap: clamp(1rem, 0.7rem + 1.2vw, 1.5rem); }
.grid--gap-lg { gap: clamp(2rem, 1rem + 4vw, 5rem); }

/* Column span helpers (desktop). All collapse to full width under 900px. */
.col-1 { grid-column: span 1; }   .col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }   .col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }   .col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }   .col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }   .col-10 { grid-column: span 10; }
.col-11 { grid-column: span 11; } .col-12 { grid-column: span 12; }
.start-2 { grid-column-start: 2; } .start-3 { grid-column-start: 3; }
.start-4 { grid-column-start: 4; } .start-6 { grid-column-start: 6; }
.start-7 { grid-column-start: 7; } .start-8 { grid-column-start: 8; }

@media (max-width: 899px) {
  .grid > [class*='col-'] { grid-column: 1 / -1; }
  .grid > [class*='start-'] { grid-column-start: 1; }
}

/* Section intro: the signature offset pairing. */
.section-intro {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1.5rem, 0.8rem + 2.4vw, 3rem);
  align-items: end;
  margin-bottom: clamp(2.5rem, 1.5rem + 3.4vw, 5rem);
}
.section-intro__head { grid-column: 1 / span 6; }
.section-intro__aside { grid-column: 8 / span 5; padding-bottom: var(--s-2); }
@media (max-width: 899px) {
  .section-intro__head, .section-intro__aside { grid-column: 1 / -1; }
  .section-intro { align-items: start; }
}

.stack > * + * { margin-top: var(--s-4); }
.stack--sm > * + * { margin-top: var(--s-2); }
.stack--lg > * + * { margin-top: var(--s-7); }

.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
  align-items: center;
}
.cluster--lg { gap: var(--s-5); }

/* ============================================================================
   TYPOGRAPHIC UTILITIES
   ========================================================================== */

.display-1 {
  font-family: var(--cn-font-display);
  font-size: var(--fs-display-1);
  font-weight: var(--fw-black);
  line-height: var(--lh-tight);
  letter-spacing: var(--tr-display);
  margin: 0 0 var(--s-6);
  text-wrap: balance;
}
.display-2 {
  font-family: var(--cn-font-display);
  font-size: var(--fs-display-2);
  font-weight: var(--fw-bold);
  line-height: var(--lh-snug);
  letter-spacing: var(--tr-display);
  margin: 0 0 var(--s-5);
  text-wrap: balance;
}

.lead {
  font-size: var(--fs-lead);
  line-height: var(--lh-normal);
  color: var(--text-muted);
  font-weight: var(--fw-reg);
  text-wrap: pretty;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-family: var(--cn-font-mono);
  font-size: var(--fs-eyebrow);
  font-weight: var(--fw-med);
  letter-spacing: var(--tr-eyebrow);
  text-transform: uppercase;
  color: var(--accent-text);
  margin-bottom: var(--s-4);
}
.eyebrow::before {
  content: '';
  inline-size: 1.75rem;
  block-size: 1px;
  background: currentColor;
  opacity: 0.55;
  flex: none;
}
.eyebrow--bare::before { display: none; }

.text-muted { color: var(--text-muted); }
.text-faint { color: var(--text-faint); }
.text-accent { color: var(--accent-text); }
.mono { font-family: var(--cn-font-mono); font-size: 0.9em; letter-spacing: 0.01em; }
.measure { max-width: var(--container-text); }
.measure--narrow { max-width: 52ch; }
.balance { text-wrap: balance; }

.rule {
  block-size: 1px;
  background: var(--line);
  border: 0;
  margin: 0;
}

/* ── Accessible reduced motion ───────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ── Print ───────────────────────────────────────────────────────────────── */
@media print {
  .site-header, .site-footer, .mega, .drawer, .to-top { display: none !important; }
  body { background: #fff; color: #000; }
  .section { padding-block: 1.5rem; }
  a::after { content: ' (' attr(href) ')'; font-size: 0.8em; color: #555; }
}