/* ==========================================================================
   layout.css — Page scaffolding shared across every page:
   container, section rhythm, site header, and site footer.
   ========================================================================== */

/* --- Container & sections ----------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--space-2xl); }
.section--tight { padding-block: var(--space-xl); }
.section--dark {
  background: var(--pine-deep);
  color: var(--mist);
}
.section--dark h1, .section--dark h2, .section--dark h3 { color: var(--mist); }
.section--dark .eyebrow { color: var(--signal); }

.section-head { max-width: 56ch; margin-bottom: var(--space-l); }
.section-head .eyebrow { display: block; margin-bottom: var(--space-s); }
.section-head p { color: var(--text-muted); font-size: var(--step-1); margin-top: var(--space-s); }
.section--dark .section-head p { color: var(--sage-soft); }

/* --- Site header --------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--mist) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.site-header[data-scrolled="true"] {
  border-bottom-color: var(--line);
  background: color-mix(in srgb, var(--mist) 96%, transparent);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-l);
  min-height: 72px;
}

.brand { display: flex; align-items: center; gap: 0.6rem; font-family: var(--font-display); font-weight: 700; font-size: 1.25rem; letter-spacing: -0.02em; color: var(--ink); }
.brand__mark { width: 30px; height: 30px; }

.primary-nav { display: flex; align-items: center; gap: var(--space-m); margin-left: auto; }
.primary-nav a { font-size: var(--step--1); font-weight: 500; color: var(--text-muted); padding-block: var(--space-2xs); transition: color var(--dur-fast) var(--ease); }
.primary-nav a:hover, .primary-nav a[aria-current="page"] { color: var(--ink); }

.header-actions { display: flex; align-items: center; gap: var(--space-s); }

/* Mobile nav toggle */
.nav-toggle { display: none; width: 44px; height: 44px; align-items: center; justify-content: center; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; display: block; width: 22px; height: 2px; background: var(--ink); transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease); position: relative;
}
.nav-toggle span::before { position: absolute; top: -7px; }
.nav-toggle span::after  { position: absolute; top: 7px; }
.nav-toggle[aria-expanded="true"] span { background: transparent; }
.nav-toggle[aria-expanded="true"] span::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span::after  { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 880px) {
  .nav-toggle { display: flex; margin-left: auto; }
  .primary-nav {
    position: fixed; inset: 72px 0 auto 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: var(--mist); border-bottom: 1px solid var(--line);
    padding: var(--space-s) var(--gutter) var(--space-l);
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
  }
  .primary-nav[data-open="true"] { transform: none; opacity: 1; pointer-events: auto; }
  .primary-nav a { padding-block: var(--space-s); border-bottom: 1px solid var(--line); }
  .header-actions { flex-direction: column; align-items: stretch; gap: var(--space-xs); margin-top: var(--space-s); }
  .header-actions .btn { width: 100%; justify-content: center; }
}

/* --- Site footer --------------------------------------------------------- */
.site-footer { background: var(--ink); color: var(--sage); padding-block: var(--space-2xl) var(--space-xl); }
.site-footer a { color: var(--sage-soft); transition: color var(--dur-fast) var(--ease); }
.site-footer a:hover { color: var(--mist); }
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: var(--space-l);
}
.footer-brand .brand { color: var(--mist); margin-bottom: var(--space-s); }
.footer-brand p { color: var(--sage); max-width: 34ch; font-size: var(--step--1); }
.footer-col h5 { font-family: var(--font-mono); font-size: var(--step--1); letter-spacing: 0.12em; text-transform: uppercase; color: var(--mist); margin-bottom: var(--space-s); }
.footer-col li { margin-bottom: var(--space-2xs); font-size: var(--step--1); }
.footer-bottom {
  display: flex; flex-wrap: wrap; gap: var(--space-s) var(--space-m);
  justify-content: space-between; align-items: center;
  margin-top: var(--space-xl); padding-top: var(--space-m);
  border-top: 1px solid rgba(143, 168, 158, 0.2);
  font-size: var(--step--1);
}
@media (max-width: 720px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}