/* ==========================================================================
   Optra — chrome
   Masthead, navigation, footer.
   ========================================================================== */

/* --- Masthead ----------------------------------------------------------- */

.masthead {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition:
    background-color var(--d-3) var(--e-soft),
    border-color var(--d-3) var(--e-soft),
    backdrop-filter var(--d-3) var(--e-soft);
  border-bottom: 1px solid transparent;
}

/* The bar only materialises once you have left the hero */
.masthead.is-lifted {
  background: rgba(233, 92, 132, 0.62);
  box-shadow: 0 10px 30px -18px rgba(122, 18, 66, 0.7);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom-color: var(--line-faint);
}

.masthead__inner {
  display: flex;
  align-items: center;
  gap: var(--s-5);
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Wordmark */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  margin-right: auto;
}

.brand__mark {
  width: 34px;
  height: 34px;
  border-radius: 11px;
  object-fit: cover;
  box-shadow: 0 4px 14px rgba(122, 18, 66, 0.42);
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.3125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1;
}

/* Primary navigation */
.nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav__link {
  position: relative;
  padding: 0.5rem 0.875rem;
  border-radius: var(--r-pill);
  font-size: var(--t-sm);
  font-weight: 500;
  color: var(--ink-72);
  transition: color var(--d-2) var(--e-soft), background-color var(--d-2) var(--e-soft);
}

.nav__link:hover { color: var(--ink); background: var(--wash); }

.nav__link[aria-current="page"] { color: var(--ink); font-weight: 600; }

.nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0.125rem;
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--ink);
  transform: translateX(-50%);
}

.masthead__actions {
  display: flex;
  align-items: center;
  gap: var(--s-3);
}

/* Contract address — hidden until an address is deployed via `ca set`. */
.ca-badge {
  display: inline-flex;
  align-items: center;
  height: 38px;
  padding: 0 0.875rem;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: var(--t-xs);
  letter-spacing: 0.02em;
  color: var(--ink-72);
  white-space: nowrap;
  box-shadow: var(--shadow-lift);
  transition:
    color var(--d-2) var(--e-soft),
    background-color var(--d-2) var(--e-soft),
    border-color var(--d-2) var(--e-soft);
}

.ca-badge:hover { color: var(--ink); background: var(--wash-lift); border-color: var(--ink-40); }

/* X / Twitter */
.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  color: var(--ink-72);
  box-shadow: var(--shadow-lift);
  transition:
    color var(--d-2) var(--e-soft),
    background-color var(--d-2) var(--e-soft),
    border-color var(--d-2) var(--e-soft),
    transform var(--d-2) var(--e-out);
}

.icon-btn:hover {
  color: var(--ink);
  background: var(--wash-lift);
  border-color: var(--ink-40);
  transform: translateY(-1px);
}

.icon-btn svg { width: 15px; height: 15px; fill: currentColor; }

/* Mobile disclosure */
.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line-soft);
  place-items: center;
}

.nav-toggle__bars {
  position: relative;
  width: 15px;
  height: 9px;
}

.nav-toggle__bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform var(--d-2) var(--e-out), opacity var(--d-1) linear;
}

.nav-toggle__bars span:first-child { top: 0; }
.nav-toggle__bars span:last-child { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child {
  transform: translateY(3.75px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}

/* Mobile sheet */
.nav-sheet {
  position: fixed;
  inset: var(--nav-h) 0 auto 0;
  z-index: 99;
  display: none;
  flex-direction: column;
  padding: var(--s-5) var(--gutter) var(--s-7);
  background: rgba(236, 96, 138, 0.9);
  box-shadow: 0 22px 50px -24px rgba(122, 18, 66, 0.8);
  backdrop-filter: blur(22px) saturate(150%);
  -webkit-backdrop-filter: blur(22px) saturate(150%);
  border-bottom: 1px solid var(--line-faint);
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity var(--d-2) var(--e-soft), transform var(--d-3) var(--e-out);
}

.nav-sheet.is-open { opacity: 1; transform: translateY(0); }

.nav-sheet a {
  padding: var(--s-4) 0;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  border-bottom: 1px solid var(--line-faint);
}

.nav-sheet a:last-of-type { border-bottom: 0; }

@media (max-width: 900px) {
  .masthead .nav { display: none; }
  .nav-toggle { display: grid; }
  .nav-sheet { display: flex; }
  .masthead__actions .btn--nav { display: none; }
}

/* --- Footer ------------------------------------------------------------- */

.footer {
  position: relative;
  margin-top: var(--s-10);
  padding-block: var(--s-8) var(--s-6);
  border-top: 1px solid var(--line-faint);
}

.footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 0.8fr));
  gap: var(--s-7);
  align-items: start;
}

.footer__mark {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: var(--s-4);
}

.footer__mark img {
  width: 40px; height: 40px; border-radius: 13px;
  box-shadow: 0 6px 18px rgba(122, 18, 66, 0.42);
}

.footer__mark span {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.footer__line {
  max-width: 34ch;
  color: var(--ink-56);
  font-size: var(--t-sm);
  line-height: 1.55;
}

.footer__col h3 { margin-bottom: var(--s-4); }

.footer__col li + li { margin-top: 0.625rem; }

.footer__col a {
  font-size: var(--t-sm);
  color: var(--ink-72);
  transition: color var(--d-2) var(--e-soft);
}

.footer__col a:hover { color: var(--ink); }

.footer__base {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-4);
  justify-content: space-between;
  align-items: center;
  margin-top: var(--s-8);
  padding-top: var(--s-5);
  border-top: 1px solid var(--line-faint);
}

.footer__base p { color: var(--ink-40); font-size: var(--t-xs); }

@media (max-width: 780px) {
  .footer__grid { grid-template-columns: 1fr 1fr; gap: var(--s-6); }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .ca-badge { padding-inline: 0.625rem; font-size: var(--t-micro); }
}