/* ──────────────────────────────────────────────────────────────────────
   Domus Lux — shared stylesheet (prototype only; ports to React after)
   Sourced from /Users/.../domus lux/.../tokens.css
   ────────────────────────────────────────────────────────────────────── */

:root {
  --bg:        hsl(0 0% 0%);
  --surface:   hsl(0 0% 4%);
  --ink-100:   hsl(0 0% 100%);
  --ink-60:    hsl(0 0% 75%);
  --ink-40:    hsl(0 0% 55%);
  --ink-20:    hsl(0 0% 30%);
  --hairline:  hsla(0 0% 100% / 0.10);
  --hairline-strong: hsla(0 0% 100% / 0.18);

  --plum:        hsl(339 32% 26%);
  --plum-hover:  hsl(339 32% 32%);
  --brass:       hsl(38 50% 55%);
  --brass-soft:  hsla(38 50% 55% / 0.40);
  --brass-glow:  hsla(38 50% 55% / 0.16);

  --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
               'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;

  --type-hero:     clamp(3.5rem, 6vw + 1rem, 6rem);
  --type-overture: clamp(1.75rem, 1vw + 1.5rem, 2.5rem);
  --type-display:  clamp(2.25rem, 3vw + 0.5rem, 3.5rem);
  --type-body:     1rem;
  --type-caption:  0.875rem;

  --container: 1280px;
  --container-narrow: 880px;
  --pad-x:     clamp(1.25rem, 4vw, 2.5rem);
  --section-y: clamp(4rem, 9vw, 7rem);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  background: var(--bg);
  color: var(--ink-100);
  font-family: var(--font-sans);
  font-size: var(--type-body);
  line-height: 1.6;
  font-weight: 400;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
/* Inline links inside body copy: the bare `a` above is deliberately
   unstyled for nav/cards, so prose links need to be marked explicitly. */
.text-link {
  color: var(--ink-100);
  text-decoration: underline;
  text-decoration-color: var(--brass-soft);
  text-underline-offset: 0.25em;
  transition: text-decoration-color 0.2s ease, color 0.2s ease;
}
.text-link:hover { color: var(--brass); text-decoration-color: var(--brass); }
button { font-family: inherit; cursor: pointer; }
img { display: block; max-width: 100%; height: auto; }

::selection { background: var(--plum); color: var(--ink-100); }

.container { max-width: var(--container); margin: 0 auto; padding-inline: var(--pad-x); }
.container.narrow { max-width: var(--container-narrow); }

/* ──────────────────────────────────────────────────────────────────────
   Editorial type fragments
   ────────────────────────────────────────────────────────────────────── */

.eyebrow {
  font-size: 0.75rem; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--brass); font-weight: 500;
  display: inline-flex; align-items: center; gap: 0.75rem;
}
.eyebrow::before {
  content: ""; display: inline-block; width: 1.5rem; height: 1px; background: var(--brass);
}
.eyebrow.no-rule::before { display: none; }

.overture {
  font-size: var(--type-overture); letter-spacing: 0.18em;
  text-transform: uppercase; font-weight: 300; color: var(--ink-100);
}

.display {
  font-size: var(--type-display); letter-spacing: -0.02em; line-height: 1.05;
  font-weight: 400; color: var(--ink-100);
}

/* ──────────────────────────────────────────────────────────────────────
   Header / footer
   ────────────────────────────────────────────────────────────────────── */

.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  background: hsla(0 0% 0% / 0.75);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--hairline);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  padding-block: 1.1rem;
}
.wordmark {
  font-size: 0.9rem; letter-spacing: 0.32em; text-transform: uppercase;
  font-weight: 600; color: var(--ink-100);
}
.wordmark .dot { color: var(--brass); margin-inline: 0.15em; }

.site-nav { display: flex; align-items: center; gap: 2rem; }
.site-nav a {
  font-size: 0.78rem; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--ink-60); font-weight: 500;
  transition: color 0.2s ease;
}
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink-100); }
.site-nav a[aria-current="page"] { position: relative; }
.site-nav a[aria-current="page"]::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -0.6rem;
  height: 1px; background: var(--brass);
}

.cta-pill {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--plum); color: var(--ink-100);
  padding: 0.7rem 1.25rem; border-radius: 999px;
  font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase;
  font-weight: 500;
  border: 1px solid hsla(38 50% 55% / 0.0);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}
.cta-pill:hover { background: var(--plum-hover); border-color: hsla(38 50% 55% / 0.45); }
.cta-pill .arrow { display: inline-block; transition: transform 0.2s ease; }
.cta-pill:hover .arrow { transform: translateX(3px); }

/* Hamburger toggle — hidden on desktop, shown <=820px. */
.nav-toggle {
  display: none;
  align-items: center; justify-content: center;
  width: 40px; height: 40px; margin-left: 0.75rem;
  background: transparent; border: 1px solid var(--hairline);
  border-radius: 8px; cursor: pointer; padding: 0;
  flex-direction: column; gap: 5px;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.nav-toggle:hover { border-color: hsla(38 50% 55% / 0.45); }
.nav-toggle__bar {
  display: block; width: 18px; height: 1.5px;
  background: var(--ink-100); border-radius: 1px;
  transition: transform 0.25s ease, opacity 0.2s ease;
  transform-origin: center;
}
.nav-toggle__bar.is-open:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle__bar.is-open:nth-child(2) { opacity: 0; }
.nav-toggle__bar.is-open:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile menu overlay — full-viewport fixed layer sitting behind the
   header bar (z=50) so the hamburger-turned-X stays clickable to close.
   Rendered outside <header> so .site-header's backdrop-filter doesn't trap
   it inside the 75px header row. */
.mobile-menu {
  position: fixed; inset: 0; z-index: 49;
  background: hsla(0 0% 0% / 0.96);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none;
  transition: opacity 0.3s ease;
}
.mobile-menu.is-open { opacity: 1; pointer-events: auto; }
.mobile-menu__nav {
  display: flex; flex-direction: column; align-items: center;
  gap: 1.5rem; padding: 2rem;
}
.mobile-menu__nav a {
  font-size: 1.4rem; letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--ink-60); font-weight: 500;
  transition: color 0.2s ease;
}
.mobile-menu__nav a:hover,
.mobile-menu__nav a[aria-current="page"] { color: var(--ink-100); }
.mobile-menu__cta {
  margin-top: 1rem;
  background: var(--plum); color: var(--ink-100) !important;
  padding: 0.9rem 1.75rem; border-radius: 999px;
  font-size: 1rem !important; letter-spacing: 0.16em !important;
  display: inline-flex; align-items: center; gap: 0.5rem;
  border: 1px solid hsla(38 50% 55% / 0.25);
}
.mobile-menu__cta:hover { background: var(--plum-hover); }

@media (max-width: 820px) {
  .site-nav { display: none; }
  /* Mobile keeps wordmark + hamburger; CTA pill collapses into the overlay
     menu so the bar doesn't crowd. */
  .site-header .cta-pill { display: none; }
  .nav-toggle { display: inline-flex; }
}

.site-footer {
  border-top: 1px solid var(--hairline);
  padding-block: 2.5rem;
  font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-40);
}
.site-footer .container {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
}
.site-footer .marks { display: flex; flex-wrap: wrap; gap: 0.75rem 1.5rem; }
.site-footer a { transition: color 0.2s ease; }
.site-footer a:hover { color: var(--brass); }

/* ──────────────────────────────────────────────────────────────────────
   Generic chapter / hero scaffold
   ────────────────────────────────────────────────────────────────────── */

.chapter-hero {
  position: relative;
  min-height: 80vh;
  display: flex; align-items: center;
  overflow: hidden;
  padding: 8rem 0 4rem;
}
.chapter-hero.tall { min-height: 100vh; padding-top: 4rem; }

.chapter-stage { position: absolute; inset: 0; pointer-events: none; }
.chapter-stage::before {
  content: "";
  position: absolute; top: 30%; left: 50%;
  width: 90vmin; height: 90vmin;
  transform: translate(-50%, -50%);
  background: radial-gradient(closest-side,
    hsla(38 50% 55% / 0.18) 0%,
    hsla(38 50% 55% / 0.05) 38%,
    transparent 70%);
  filter: blur(8px);
  animation: hero-drift 38s ease-in-out infinite;
}
.chapter-stage::after {
  content: "";
  position: absolute; bottom: -20%; right: -10%;
  width: 70vmin; height: 70vmin;
  background: radial-gradient(closest-side,
    hsla(339 32% 26% / 0.50) 0%,
    hsla(339 32% 26% / 0.10) 45%,
    transparent 75%);
  filter: blur(10px);
  animation: hero-drift-2 52s ease-in-out infinite;
}
@keyframes hero-drift {
  0%,100% { transform: translate(-50%, -50%) scale(1); }
  50%     { transform: translate(-46%, -54%) scale(1.06); }
}
@keyframes hero-drift-2 {
  0%,100% { transform: translate(0,0) scale(1); }
  50%     { transform: translate(-3%, -2%) scale(1.04); }
}

.chapter-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, hsla(0 0% 100% / 0.025) 1px, transparent 1px),
    linear-gradient(to bottom, hsla(0 0% 100% / 0.025) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
  pointer-events: none;
}

.chapter-marker {
  font-size: 0.78rem; letter-spacing: 0.4em; text-transform: uppercase;
  color: var(--brass); font-weight: 500;
  display: inline-flex; align-items: center; gap: 1.25rem;
}
.chapter-marker .rule {
  width: 2.5rem; height: 1px; background: var(--brass); display: inline-block;
}

/* ──────────────────────────────────────────────────────────────────────
   Reveal-on-scroll
   ────────────────────────────────────────────────────────────────────── */

.reveal {
  opacity: 0; transform: translateY(14px);
  transition: opacity 0.9s ease, transform 0.9s ease;
  transition-delay: var(--reveal-delay, 0ms);
}
.reveal.in { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .chapter-stage::before, .chapter-stage::after { animation: none; }
}

/* ──────────────────────────────────────────────────────────────────────
   Closing CTA block
   ────────────────────────────────────────────────────────────────────── */

.closing {
  position: relative;
  padding-block: clamp(6rem, 12vw, 10rem);
  border-top: 1px solid var(--hairline);
  text-align: center;
  overflow: hidden;
}
.closing::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at center,
    hsla(38 50% 55% / 0.10) 0%, transparent 60%);
  pointer-events: none;
}
.closing .container { position: relative; z-index: 1; }
.closing .eyebrow { margin-bottom: 2rem; justify-content: center; }
.closing h2 {
  font-size: clamp(2.5rem, 5vw + 0.5rem, 5rem);
  font-weight: 400; letter-spacing: -0.025em; line-height: 1.0;
  max-width: 18ch; margin: 0 auto 0.8rem;
}
.closing h2 em { font-style: normal; color: var(--brass); }
.closing p {
  color: var(--ink-60); font-size: 1.1rem; font-weight: 300;
  max-width: 44ch; margin: 0 auto 3rem; line-height: 1.5;
}
.closing .cta-pill { font-size: 0.85rem; padding: 1.1rem 2rem; }