/* ================================================================
   Invariant — Shared Site Header
   Extracted from landing-page.css; used on all marketing pages.
   ================================================================ */

/* Extra tokens not defined in policy/terms :root blocks */
:root {
  --ink-08:    rgba(20, 20, 19, 0.08);
  --rule-soft: rgba(176, 174, 165, 0.35);
  --radius-pill: 999px;
  --dur-fast: 200ms;
  --dur-base: 280ms;
  --dur-slow: 520ms;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --container-pad-header: clamp(1.25rem, 4vw, 2.75rem);
}

/* ── Header ── */
.landing-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 60;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: transparent;
  transition: background var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.landing-header.is-scrolled {
  background: rgba(250, 249, 245, 0.88);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom-color: var(--rule-soft);
}

.header-container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad-header);
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 100%;
}

.header-logo { flex: 0 0 auto; }
.header-logo a {
  display: inline-flex;
  align-items: center;
  color: var(--color-ink);
}

/* Animated wordmark */
.header-logo-word {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 20px;
  line-height: 1;
  letter-spacing: -0.015em;
  text-transform: uppercase;
  color: var(--color-ink);
  display: inline-flex;
  align-items: baseline;
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease-out);
}
.header-logo a:hover .header-logo-word { color: var(--color-accent); }

.header-logo-word .hl-ch {
  display: inline-block;
  overflow: hidden;
  line-height: 1;
  position: relative;
  transition: width 0.55s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: width;
}
.header-logo-word .hl-ch span { display: block; line-height: 1; white-space: nowrap; }
.header-logo-word .hl-slash {
  display: inline-block;
  line-height: 1;
  position: relative;
  overflow: visible;
}
.header-logo-word .hl-slash span {
  display: inline-block;
  position: relative;
  left: 0;
  transform: none;
  line-height: 1;
}

/* ── Navigation ── */
.header-nav {
  display: flex;
  align-items: center;
  gap: 2.2rem;
  margin-left: 1rem;
}

.nav-link {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-ink);
  position: relative;
  padding: 0.25rem 0;
  letter-spacing: 0.005em;
  transition: color var(--dur-fast) var(--ease-out);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  bottom: -3px;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: 50% 50%;
  transition: transform var(--dur-base) var(--ease-out),
              opacity var(--dur-base) var(--ease-out);
  opacity: 0;
}
.nav-link:hover { color: var(--color-ink); }
.nav-link:hover::after { transform: scaleX(1); opacity: 1; }

/* ── Header actions ── */
.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Hidden auth buttons kept for JS compatibility */
.user-dropdown-container { display: none; }
.btn-sign-in, .btn-sign-up { display: none; }

/* ── Try Pluto pill ── */
.try-pluto-wrap {
  position: relative;
  display: inline-flex;
  align-items: stretch;
  border-radius: var(--radius-pill);
  background: var(--color-ink);
  color: var(--color-bg);
  height: 40px;
  overflow: visible;
  transition: background var(--dur-fast) var(--ease-out);
}
.try-pluto-main,
.try-pluto-arrow {
  font-family: var(--font-sans);
  font-weight: 500;
  color: var(--color-bg);
  background: transparent;
  display: inline-flex;
  align-items: center;
  height: 100%;
  transition: color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.try-pluto-main {
  font-size: 0.9375rem;
  padding: 0 0.95rem 0 1.1rem;
  border-top-left-radius: var(--radius-pill);
  border-bottom-left-radius: var(--radius-pill);
  letter-spacing: 0.01em;
}
.try-pluto-arrow {
  padding: 0 0.85rem;
  border-top-right-radius: var(--radius-pill);
  border-bottom-right-radius: var(--radius-pill);
}
.try-pluto-arrow i {
  font-size: 0.7rem;
  transition: transform var(--dur-base) var(--ease-out);
}
.try-pluto-arrow:hover i,
.try-pluto-arrow[aria-expanded="true"] i { transform: rotate(180deg); }

.try-pluto-sep {
  width: 1px;
  align-self: center;
  height: 55%;
  background: rgba(250, 249, 245, 0.22);
}
.try-pluto-wrap:hover { background: #2a2927; }

.try-pluto-dropdown {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 240px;
  background: var(--color-bg);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: 0.65rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--dur-base) var(--ease-out),
              transform var(--dur-base) var(--ease-out),
              visibility 0s linear var(--dur-base);
  z-index: 70;
}
.try-pluto-dropdown.tp-drop-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition-delay: 0s;
}
.tp-products-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-muted);
  padding: 0.35rem 0.65rem 0.5rem;
}
.tp-product-item {
  display: flex;
  flex-direction: column;
  padding: 0.55rem 0.65rem;
  border-radius: 6px;
  transition: background var(--dur-fast) var(--ease-out);
}
.tp-product-item:hover { background: var(--color-surface); }
.tp-product-name {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--color-ink);
  line-height: 1.2;
}
.tp-product-desc {
  font-size: 0.8125rem;
  color: var(--color-ink-55);
  margin-top: 0.1rem;
}

/* ── Mobile menu toggle ── */
.mobile-menu-toggle {
  display: none;
  width: 40px; height: 40px;
  align-items: center; justify-content: center;
  color: var(--color-ink);
  border-radius: var(--radius-pill);
  transition: background var(--dur-fast) var(--ease-out);
}
.mobile-menu-toggle:hover { background: var(--ink-08); }
.mobile-menu-toggle i { font-size: 1.2rem; }

/* ── Mobile menu panel ── */
.mobile-menu {
  position: fixed;
  top: 0; right: 0;
  width: 320px;
  max-width: 90vw;
  height: 100vh;
  background: var(--color-bg);
  border-left: 1px solid var(--rule);
  z-index: 100;
  transform: translateX(100%);
  transition: transform var(--dur-slow) var(--ease-out);
  display: flex;
  flex-direction: column;
  padding: 1.25rem 1.5rem 2rem;
}
.mobile-menu.active { transform: translateX(0); }

.mobile-menu-overlay {
  position: fixed;
  inset: 0;
  background: rgba(20,20,19,0.4);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-base) var(--ease-out), visibility 0s linear var(--dur-base);
}
.mobile-menu-overlay.active { opacity: 1; visibility: visible; transition-delay: 0s; }

.mobile-menu-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--rule);
}
.mobile-menu-header img { height: 28px; width: auto; }
.mobile-menu-close {
  width: 36px; height: 36px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: var(--radius-pill);
  color: var(--color-ink);
  background: none;
  border: 0;
  cursor: pointer;
}
.mobile-menu-close:hover { background: var(--ink-08); }

.mobile-nav {
  display: flex;
  flex-direction: column;
  padding: 1.5rem 0;
  gap: 0.25rem;
  border-bottom: 1px solid var(--rule);
}
.mobile-nav-link {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--color-ink);
  padding: 0.5rem 0;
  transition: color var(--dur-fast) var(--ease-out);
}
.mobile-nav-link:hover { color: var(--color-accent); }

.mobile-menu-actions {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-top: 1.5rem;
}
.btn-mobile-sign-in,
.btn-mobile-sign-up {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 44px;
  padding: 0 1.25rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.95rem;
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.btn-mobile-sign-in {
  color: var(--color-ink);
  border: 1px solid var(--color-ink);
  background: transparent;
}
.btn-mobile-sign-in:hover { background: var(--color-ink); color: var(--color-bg); }
.btn-mobile-sign-up { color: var(--color-bg); background: var(--color-ink); }
.btn-mobile-sign-up:hover { background: #2a2927; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0);
  white-space: nowrap; border: 0;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .header-nav { display: none; }
  .mobile-menu-toggle { display: inline-flex; }
  .try-pluto-main { padding: 0 0.8rem 0 0.9rem; font-size: 0.88rem; }
  .try-pluto-arrow { padding: 0 0.7rem; }
}