/* ==========================================================================
   layout.css — navigation, footer, page scaffolding
   ========================================================================== */

/* Top nav */
.site-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding-block: var(--space-4);
  background: rgba(247, 244, 237, 0.65);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid transparent;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), padding var(--dur) var(--ease);
}
.site-nav.scrolled {
  background: rgba(247, 244, 237, 0.92);
  border-bottom-color: var(--line);
  padding-block: var(--space-3);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 3rem);
}

.brand {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  letter-spacing: -0.01em;
  line-height: 1;
  color: var(--ink);
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
}
.brand .mark {
  display: inline-block;
  width: 8px; height: 8px;
  background: var(--accent);
  border-radius: 50%;
  transform: translateY(-2px);
}
.brand small {
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-muted);
  margin-left: 0.4em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 3vw, 2.5rem);
  list-style: none;
}
.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  position: relative;
  padding-block: 0.4rem;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--ink);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}
.nav-links a:hover,
.nav-links a.active { color: var(--ink); }
.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1); }

.nav-links a.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  border-radius: 999px;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-links a.nav-cta::after { display: none; }
.nav-links a.nav-cta:hover {
  background: var(--accent);
  color: var(--paper);
  transform: translateY(-1px);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  width: 36px; height: 36px;
  position: relative;
  z-index: 110;
}
.nav-toggle span {
  position: absolute;
  left: 8px; right: 8px;
  height: 1.5px;
  background: var(--ink);
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle span:nth-child(1) { top: 13px; }
.nav-toggle span:nth-child(2) { top: 18px; }
.nav-toggle span:nth-child(3) { top: 23px; }
.nav-toggle.is-open span:nth-child(1) { top: 18px; transform: rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { top: 18px; transform: rotate(-45deg); }

@media (max-width: 860px) {
  /* Remove backdrop-filter on mobile — it creates a CSS containing block
     that traps the fixed-position mobile menu inside the header strip. */
  .site-nav {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    background: var(--paper);
  }
  .site-nav.scrolled {
    background: var(--paper);
    border-bottom-color: var(--line);
  }

  .nav-toggle {
    display: block;
    position: relative;
    z-index: 115;
  }
  .brand { position: relative; z-index: 115; }

  .nav-links {
    position: fixed;
    inset: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    background: var(--paper);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2.25rem;
    padding: 2rem;
    margin: 0;
    transform: translateX(100%);
    transition: transform 0.35s var(--ease-out);
    z-index: 110;
    box-shadow: -20px 0 60px rgba(28, 24, 20, 0.12);
  }
  .nav-links.is-open { transform: translateX(0); }
  .nav-links::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
      radial-gradient(ellipse 60% 50% at 50% 30%, var(--paper-warm) 0%, transparent 70%),
      radial-gradient(ellipse 60% 40% at 50% 80%, var(--accent-soft) 0%, transparent 65%);
    opacity: 0.6;
    pointer-events: none;
    z-index: -1;
  }
  .nav-links li { list-style: none; }
  .nav-links a {
    font-size: 2rem;
    font-family: var(--font-serif);
    font-weight: 300;
    text-transform: none;
    letter-spacing: -0.01em;
    color: var(--ink);
  }
  .nav-links a::after { display: none !important; }
  .nav-links a.nav-cta,
  .nav-cta {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    padding: 1rem 2.25rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    margin-top: 1rem;
  }
}

/* Footer */
.site-footer {
  padding: clamp(3rem, 6vw, 5rem) 0 2rem;
  background: var(--ink);
  color: var(--paper);
}
.site-footer .container { padding-block: 0; }
.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 3rem;
  border-bottom: 1px solid rgba(247, 244, 237, 0.12);
}
@media (max-width: 780px) {
  .footer-top { grid-template-columns: 1fr 1fr; gap: 2rem; }
}
@media (max-width: 480px) {
  .footer-top { grid-template-columns: 1fr; }
}
.footer-brand h3 {
  font-size: 2rem;
  color: var(--paper);
  margin-bottom: 0.75rem;
}
.footer-brand p {
  font-size: 0.95rem;
  color: rgba(247, 244, 237, 0.65);
  max-width: 36ch;
}
.footer-col h4 {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(247, 244, 237, 0.5);
  margin-bottom: 1rem;
}
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 0.5rem; }
.footer-col a {
  color: rgba(247, 244, 237, 0.85);
  font-size: 0.95rem;
}
.footer-col a:hover { color: var(--accent-soft); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 2rem;
  color: rgba(247, 244, 237, 0.5);
  font-size: 0.8rem;
}
@media (max-width: 600px) { .footer-bottom { flex-direction: column; gap: 1rem; } }

/* Page header banner */
.page-header {
  padding-top: 180px;
  padding-bottom: clamp(3rem, 6vw, 5rem);
  text-align: center;
  background:
    radial-gradient(ellipse at top, var(--paper-warm) 0%, transparent 60%),
    var(--paper);
}
.page-header .eyebrow { display: block; margin-bottom: 1rem; }
.page-header h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--ink);
}
.page-header p {
  max-width: 56ch;
  margin: 1.5rem auto 0;
  color: var(--ink-soft);
  font-size: 1.1rem;
  line-height: 1.7;
}