:root {
  --portal-nav-max: 1440px;
  --landing-max: 1440px;
}

.portal-page {
  scroll-behavior: smooth;
}

.portal-page .page {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.38s cubic-bezier(0.22, 1, 0.36, 1), transform 0.38s cubic-bezier(0.22, 1, 0.36, 1);
}

.portal-page.portal-ready .page {
  opacity: 1;
  transform: none;
}

.portal-page.portal-leaving .page {
  opacity: 0;
  transform: translateY(-8px);
  transition-duration: 0.24s;
  transition-timing-function: ease-in;
}

.portal-page.portal-leaving .landing-header {
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

/* ── Shared header / nav ── */
.landing-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--portal-header-bg, rgba(255, 255, 255, 0.9)) 82%, transparent);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  transition:
    border-color 0.35s ease,
    box-shadow 0.35s ease,
    background 0.35s ease,
    opacity 0.2s ease,
    transform 0.2s ease;
  animation: landing-header-in 0.7s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.landing-header.is-scrolled {
  border-bottom-color: var(--portal-line);
  box-shadow: 0 10px 32px rgba(15, 23, 42, 0.07);
  background: color-mix(in srgb, var(--portal-header-bg, rgba(255, 255, 255, 0.95)) 94%, transparent);
}

.landing-header-glow {
  position: absolute;
  left: 50%;
  bottom: -1px;
  width: min(480px, 70vw);
  height: 2px;
  transform: translateX(-50%);
  background: var(--brand-gradient);
  opacity: 0.55;
  filter: blur(0.5px);
  animation: landing-header-glow 4s ease-in-out infinite;
  pointer-events: none;
}

@keyframes landing-header-in {
  from { opacity: 0; transform: translateY(-14px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes landing-header-glow {
  0%, 100% { opacity: 0.35; width: min(360px, 55vw); }
  50% { opacity: 0.75; width: min(520px, 78vw); }
}

.landing-header-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
  width: min(var(--portal-nav-max), 100%);
  margin: 0 auto;
  padding: 18px 28px;
  min-height: 72px;
}

.landing-header-brand {
  justify-self: start;
  text-decoration: none;
  transition: transform 0.25s ease, filter 0.25s ease;
  animation: landing-brand-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.1s both;
}

.landing-header-brand:hover {
  transform: translateY(-1px);
  filter: drop-shadow(0 4px 14px rgba(0, 180, 216, 0.18));
}

.landing-header-brand .brand-lockup-text strong {
  font-size: 19px;
}

.landing-header-brand .logo {
  transition: transform 0.35s ease, box-shadow 0.35s ease;
}

.landing-header-brand:hover .logo {
  transform: scale(1.04) rotate(-2deg);
}

@keyframes landing-brand-in {
  from { opacity: 0; transform: translateX(-12px); }
  to { opacity: 1; transform: translateX(0); }
}

.landing-nav {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--brand-cyan) 12%, var(--portal-line));
  background: color-mix(in srgb, var(--portal-panel) 88%, transparent);
  box-shadow: 0 4px 18px rgba(15, 23, 42, 0.04);
}

.landing-nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border-radius: 999px;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--portal-muted);
  text-decoration: none;
  white-space: nowrap;
  transition:
    color 0.22s ease,
    background 0.22s ease,
    transform 0.22s ease,
    box-shadow 0.22s ease;
  animation: landing-nav-item-in 0.65s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.landing-nav-link:nth-child(1) { animation-delay: 0.15s; }
.landing-nav-link:nth-child(2) { animation-delay: 0.22s; }
.landing-nav-link:nth-child(3) { animation-delay: 0.29s; }
.landing-nav-link:nth-child(4) { animation-delay: 0.36s; }
.landing-nav-link:nth-child(5) { animation-delay: 0.43s; }

@keyframes landing-nav-item-in {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.landing-nav-link::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--brand-gradient-soft);
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.22s ease, transform 0.22s ease;
  z-index: -1;
}

.landing-nav-link:hover {
  color: var(--brand-cyan-deep);
  transform: translateY(-1px);
  text-decoration: none;
}

.landing-nav-link:hover::before {
  opacity: 1;
  transform: scale(1);
}

.landing-nav-link.is-active {
  color: #fff;
  font-weight: 600;
  background: var(--brand-gradient);
  box-shadow: 0 8px 20px rgba(0, 180, 216, 0.28);
}

.landing-nav-link.is-active::before {
  opacity: 0;
}

.landing-nav-link:focus-visible,
.landing-header-brand:focus-visible,
.landing-nav-cta:focus-visible,
.portal-theme-toggle:focus-visible,
.portal-mobile-nav-toggle:focus-visible {
  outline: 2px solid var(--brand-cyan);
  outline-offset: 2px;
}

.landing-header-actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 12px;
  animation: landing-brand-in 0.8s cubic-bezier(0.22, 1, 0.36, 1) 0.18s both;
}

.landing-header-actions .portal-theme-toggle {
  font-size: 14px;
  padding: 8px 14px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.landing-header-actions .portal-theme-toggle:hover {
  transform: scale(1.04);
}

.landing-nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 20px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  color: var(--brand-cyan-deep);
  text-decoration: none;
  border: 1px solid color-mix(in srgb, var(--brand-cyan) 28%, var(--portal-line));
  background: var(--brand-gradient-soft);
  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease,
    color 0.22s ease,
    background 0.22s ease;
}

.landing-nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(0, 180, 216, 0.2);
  color: var(--brand-cyan-deep);
  text-decoration: none;
}

.portal-page .brand-lockup {
  text-decoration: none;
}

@media (max-width: 900px) {
  .landing-header-inner {
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto;
    gap: 14px 16px;
    padding: 14px 20px;
    min-height: auto;
  }

  .landing-header-brand { grid-column: 1; grid-row: 1; }
  .landing-header-actions { grid-column: 2; grid-row: 1; justify-self: end; }

  .landing-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: center;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    gap: 4px;
    padding: 5px 8px;
  }

  .landing-nav-link {
    min-height: 36px;
    padding: 0 14px;
    font-size: 15px;
  }
}

.portal-mobile-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 64px;
  min-height: 40px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--portal-line);
  background: var(--portal-panel);
  color: var(--portal-text);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
}

.portal-mobile-nav-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 45;
  background: rgba(15, 23, 42, 0.42);
}

.portal-mobile-nav-backdrop.open {
  display: block;
}

@media (max-width: 700px) {
  .landing-header-brand .brand-lockup-text span {
    display: none;
  }

  .portal-mobile-nav-toggle {
    display: inline-flex;
  }

  .landing-header-actions {
    gap: 8px;
  }

  .landing-header-actions .portal-theme-toggle,
  .landing-nav-cta {
    min-width: 58px;
    padding-inline: 12px;
    white-space: nowrap;
  }

  .landing-nav {
    display: none;
    position: fixed;
    left: 16px;
    right: 16px;
    top: 76px;
    z-index: 46;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    padding: 12px;
    border-radius: 16px;
    box-shadow: var(--portal-shadow);
  }

  .landing-nav.is-open {
    display: flex;
  }

  .landing-nav-link {
    justify-content: flex-start;
    white-space: normal;
    text-align: left;
  }
}

[data-theme="dark"] .landing-header {
  border-bottom-color: color-mix(in srgb, var(--portal-line) 40%, transparent);
}

[data-theme="dark"] .landing-header.is-scrolled {
  border-bottom-color: var(--portal-line);
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.42);
  background: color-mix(in srgb, var(--portal-header-bg) 96%, transparent);
}

[data-theme="dark"] .landing-nav-link {
  color: var(--portal-muted);
}

[data-theme="dark"] .landing-nav-link:hover,
[data-theme="dark"] .landing-nav-link.is-active {
  color: var(--brand-cyan-light);
}

[data-theme="dark"] .portal-theme-toggle {
  background: color-mix(in srgb, var(--portal-panel) 88%, #0b1220 12%);
}

@media (prefers-reduced-motion: reduce) {
  .portal-page .page {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .landing-header,
  .landing-header-brand,
  .landing-nav-link,
  .landing-header-actions,
  .landing-header-glow {
    animation: none;
  }

  .landing-nav-link,
  .landing-header-brand,
  .landing-nav-cta,
  .portal-theme-toggle {
    transition: none;
  }
}