/*
 * brief/layout.css - page structure for brief mode: centred measure, wide
 * gutters, one screen from the top of the page to the contact line.
 * Dependencies: brief/tokens.css for every colour and size token.
 * Invariants: scoped under [data-mode="brief"]. Layout only - the styling of
 *             repeated blocks (cards, rows, chips) is brief/blocks.css.
 * Non-goals: no colour literals; no component internals.
 */

@layer components {
  [data-mode="brief"] {
    --gutter: clamp(1.25rem, 5vw, 5rem);
    --shell: 76rem;
  }

  [data-mode="brief"] main { padding-bottom: calc(var(--u) * 12); }

  [data-mode="brief"] section {
    max-width: var(--shell);
    margin-inline: auto;
    padding-inline: var(--gutter);
  }

  /* Hero. Only .hero.lead (the home page) claims the viewport: on a short
     inner page, centring in 88svh pushes the H1 below the fold and the
     visitor's first screen is empty. min-height is svh, not vh, so mobile
     browser chrome cannot push the contact line out of view either. */
  [data-mode="brief"] .hero {
    display: flex;
    flex-direction: column;
    gap: calc(var(--u) * 3);
    padding-block: calc(var(--u) * 6) calc(var(--u) * 5);
  }
  [data-mode="brief"] .hero.lead {
    min-height: 84svh;
    justify-content: center;
    padding-block: calc(var(--u) * 8) calc(var(--u) * 6);
  }
  [data-mode="brief"] .hero h1 {
    font-family: var(--font-display);
    font-size: var(--step-display);
    line-height: 0.98;
    letter-spacing: -0.035em;
    font-weight: 680;
    max-width: 18ch;
    text-wrap: balance;
  }
  [data-mode="brief"] .hero .lede {
    font-size: var(--step-lede);
    color: var(--muted);
    max-width: 52ch;
    text-wrap: pretty;
  }
  [data-mode="brief"] .ident {
    font-family: var(--mono);
    font-size: 0.8rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
  }

  [data-mode="brief"] section + section { padding-top: calc(var(--u) * 9); }

  [data-mode="brief"] h2 {
    font-family: var(--font-display);
    font-size: var(--step-h2);
    line-height: 1.1;
    letter-spacing: -0.02em;
    font-weight: 660;
    max-width: 24ch;
    text-wrap: balance;
  }
  [data-mode="brief"] h3 {
    font-size: var(--step-h3);
    font-weight: 640;
    letter-spacing: -0.01em;
  }
  [data-mode="brief"] p { max-width: var(--measure); text-wrap: pretty; }
  [data-mode="brief"] section > p { margin-top: calc(var(--u) * 2); }

  /* Section headers: a small counter/label above the heading. */
  [data-mode="brief"] .sec-head {
    display: flex;
    flex-direction: column;
    gap: calc(var(--u) * 1.5);
    margin-bottom: calc(var(--u) * 4);
  }
  [data-mode="brief"] .sec-head .num {
    font-family: var(--mono);
    font-size: 0.75rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--muted);
    display: flex;
    align-items: center;
    gap: var(--u);
  }
  [data-mode="brief"] .sec-head .num::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--rule);
  }

  [data-mode="brief"] .grid {
    display: grid;
    gap: calc(var(--u) * 2);
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  }
  [data-mode="brief"] .grid-2 {
    display: grid;
    gap: calc(var(--u) * 2);
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 24rem), 1fr));
  }

  [data-mode="brief"] .more {
    margin-top: calc(var(--u) * 3);
    color: var(--muted);
    font-size: 0.94rem;
  }
}