/* ============================================================
   Ofnstube · layout.css
   Containers, section rhythm, header, nav, footer, grids.
   ============================================================ */

/* — Containers — */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--wide   { max-width: var(--container-wide); }
.container--narrow { max-width: var(--container-narrow); }

/* — Section rhythm (B: one system, flush transitions) — */
.section { position: relative; padding-block: var(--section-y); }
.section--tight { padding-block: calc(var(--section-y) * .6); }
.section--raised { background: var(--surface-raised); }
.section--sunken { background: var(--surface-sunken); }
.section--bone {
  background: var(--surface-bone);
  color: var(--text-on-bone);
}
.section--bone h1, .section--bone h2,
.section--bone h3, .section--bone h4 { color: var(--text-on-bone); }
.section--bone .eyebrow { color: var(--ember-deep); }
.section--glut { overflow: hidden; }

.section-head { max-width: 64ch; margin-bottom: var(--sp-7); }
.section-head--center { margin-inline: auto; text-align: center; }
.section-head p { color: var(--text-dim); font-size: var(--fs-body-lg); margin-top: var(--sp-4); }
.section--bone .section-head p { color: var(--text-on-bone-dim); }

/* — Header — */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: var(--z-header);
  height: var(--header-h);
  display: flex;
  align-items: center;
  border-bottom: 1px solid transparent;
  transition: background var(--dur) var(--ease-out),
              border-color var(--dur) var(--ease-out),
              backdrop-filter var(--dur) var(--ease-out);
}
.site-header.is-scrolled {
  background: rgba(13, 13, 13, .88);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--hairline);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: var(--sp-5);
  width: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  flex: none;
}
.brand__logo { height: 36px; width: auto; }
.brand__word {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  letter-spacing: -.01em;
  color: var(--bone);
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 30px);
  margin-left: auto;
}
.nav__link {
  position: relative;
  font-size: .95rem;
  font-weight: 500;
  color: var(--text-dim);
  padding: 8px 1px;
  transition: color var(--dur) var(--ease-out);
}
.nav__link:hover,
.nav__link[aria-current="page"] { color: var(--bone); }
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 100%; bottom: 1px;
  height: 2px;
  background: var(--ember-orange);
  box-shadow: 0 0 10px var(--ember-glow-1);
  transition: right var(--dur) var(--ease-out);
}
.nav__link:hover::after,
.nav__link[aria-current="page"]::after { right: 0; }

.header-actions { display: flex; align-items: center; gap: var(--sp-3); flex: none; }

/* — Language switch — */
.lang-switch {
  display: inline-flex;
  border: var(--border-strong);
  border-radius: var(--r-pill);
  overflow: hidden;
}
.lang-switch__btn {
  font-size: .76rem;
  font-weight: 600;
  letter-spacing: .04em;
  padding: 6px 11px;
  color: var(--text-faint);
  transition: color var(--dur), background var(--dur);
}
.lang-switch__btn[aria-pressed="true"] {
  color: var(--smoked-black);
  background: var(--bone);
}

/* — Hamburger — */
.nav-toggle {
  display: none;
  width: 46px; height: 46px;
  border: var(--border-strong);
  border-radius: var(--r-sm);
  align-items: center;
  justify-content: center;
  flex: none;
}
.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  display: block;
  width: 20px; height: 2px;
  background: var(--bone);
  transition: transform var(--dur) var(--ease-out), opacity var(--dur);
}
.nav-toggle__bars { position: relative; }
.nav-toggle__bars::before { position: absolute; top: -6px; }
.nav-toggle__bars::after  { position: absolute; top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after  { transform: translateY(-6px) rotate(-45deg); }

/* — Mobile nav drawer — */
.mobile-nav {
  position: fixed;
  inset: var(--header-h) 0 0 0;
  z-index: var(--z-banner);
  background: rgba(8, 8, 8, .98);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  padding: var(--sp-6) var(--gutter) var(--sp-8);
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  transform: translateX(100%);
  visibility: hidden;
  transition: transform var(--dur) var(--ease-in-out), visibility var(--dur);
  overflow-y: auto;
}
.mobile-nav.is-open { transform: translateX(0); visibility: visible; }
.mobile-nav__link {
  font-family: var(--font-display);
  font-size: 1.7rem;
  font-weight: 540;
  color: var(--bone);
  padding: 14px 0;
  border-bottom: 1px solid var(--hairline);
}
.mobile-nav__link[aria-current="page"] { color: var(--ember-orange); }
.mobile-nav__foot { margin-top: var(--sp-6); display: flex; flex-direction: column; gap: var(--sp-4); }

/* — Footer — */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--surface-sunken);
  border-top: 1px solid var(--hairline);
  padding-block: var(--sp-8) var(--sp-5);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.3fr;
  gap: var(--sp-7) var(--sp-5);
  position: relative;
  z-index: 1;
}
.footer-col h4 {
  font-family: var(--font-body);
  font-size: var(--fs-eyebrow);
  font-weight: 700;
  letter-spacing: var(--tracking-eyebrow);
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: var(--sp-4);
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col a, .footer-col p { color: var(--text-dim); font-size: .95rem; transition: color var(--dur); }
.footer-col a:hover { color: var(--ember-orange); }
.footer-brand__mark { height: 40px; width: auto; margin-bottom: var(--sp-4); }
.footer-brand p { max-width: 34ch; }

.footer-bottom {
  position: relative;
  z-index: 1;
  margin-top: var(--sp-7);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--hairline);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3) var(--sp-5);
  align-items: center;
  justify-content: space-between;
  color: var(--text-faint);
  font-size: var(--fs-small);
}
.footer-bottom nav { display: flex; flex-wrap: wrap; gap: var(--sp-2) var(--sp-5); }

/* — Grids — */
.grid { display: grid; gap: var(--sp-5); }
.grid--cards { grid-template-columns: repeat(auto-fit, minmax(min(290px, 100%), 1fr)); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.split {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: clamp(28px, 5vw, 80px);
  align-items: center;
}

/* — Utilities — */
.text-center { text-align: center; }
.btn-row { display: flex; gap: var(--sp-3); flex-wrap: wrap; }
.btn-row--center { justify-content: center; }
.section-foot { margin-top: var(--sp-7); }
.flow > * + * { margin-top: var(--sp-4); }
.mt-5 { margin-top: var(--sp-5); }
.mt-6 { margin-top: var(--sp-6); }

/* — Responsive — */
@media (max-width: 1024px) {
  .nav, .header-actions .lang-switch { display: none; }
  .nav-toggle { display: inline-flex; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; gap: var(--sp-6); }
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}

/* — Stage 1.5 · editorial footer refresh — */
.site-footer { padding-block: clamp(64px, 10vh, 116px) var(--sp-6); }
.footer-grid { grid-template-columns: 2fr 1fr 1fr 1.3fr; }
.footer-brand p {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 1rem + 1vw, 1.75rem);
  line-height: 1.24;
  color: var(--bone);
  max-width: 20ch;
}
.footer-col h4 { color: var(--ember-orange); }
@media (max-width: 1024px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 640px)  { .footer-grid { grid-template-columns: 1fr; } }

/* — Stage 2 · large-desktop (1920px+) — content uses the space, no thin column — */
@media (min-width: 1920px) {
  :root {
    --container: 1380px;
    --container-wide: 1640px;
    --container-narrow: 840px;
    --section-y: clamp(104px, 9vh, 168px);
  }
  .hero { max-width: 2560px; margin-inline: auto; }
}