/* IMP-0169 shared site shell — OpenMyBrain unified navigation */
:root {
  --frost-white: #F4F9FF;
  --ice-pale: #E4EEF8;
  --glacier-blue: #A9C9E8;
  --arctic-cyan: #6FB6D9;
  --deep-cobalt: #0B2545;
  --slate-ink: #1E3A5F;
  --silver-mist: #CFDDEB;
  --pulse-cyan: #00E1FF;
  --shadow-blue: rgba(11, 37, 69, 0.08);
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, monospace;
  --maxw: 1140px;
  --nav-h: 60px;
  --nav-mobile-extra: 52px;
  --radius: 18px;
  --ease: 0.22s ease;
}

a.skip-link[data-site-shell="skip"] {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 10000;
  background: var(--deep-cobalt);
  color: var(--frost-white);
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  text-decoration: none;
  border-radius: 0 0 8px 0;
}
a.skip-link[data-site-shell="skip"]:focus {
  left: 0;
}

header.site-shell[data-site-shell="header"] {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1100;
  min-height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 24px;
  background: rgba(244, 249, 255, 0.88);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--silver-mist);
}

header.site-shell .shell-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--deep-cobalt);
  font-size: 15px;
  text-decoration: none;
  border: none;
  flex-shrink: 0;
  z-index: 3;
}
header.site-shell .shell-logo svg {
  width: 24px;
  height: 24px;
  color: var(--arctic-cyan);
}

header.site-shell .shell-right {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--arctic-cyan);
  flex-shrink: 0;
  z-index: 3;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 10px;
}
header.site-shell .shell-right .anno-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--slate-ink);
  border: none;
}
header.site-shell .shell-right .anno-switch .track {
  width: 34px;
  height: 18px;
  border-radius: 999px;
  background: var(--silver-mist);
  position: relative;
  display: inline-block;
}
header.site-shell .shell-right .anno-switch .knob {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--frost-white);
  transition: all var(--ease);
}
body.anno-on header.site-shell .shell-right .anno-switch .track {
  background: var(--deep-cobalt);
}
body.anno-on header.site-shell .shell-right .anno-switch .knob {
  left: 18px;
  background: var(--pulse-cyan);
}

nav[data-site-nav] {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 4px;
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--silver-mist);
  border-radius: 999px;
  padding: 4px;
  box-shadow: 0 2px 10px var(--shadow-blue);
  z-index: 2;
  max-width: calc(100vw - 280px);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
nav[data-site-nav]::-webkit-scrollbar { display: none; }

nav[data-site-nav] a[data-route] {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--slate-ink);
  padding: 6px 12px;
  border-radius: 999px;
  transition: all var(--ease);
  white-space: nowrap;
  text-decoration: none;
  border: none;
  flex-shrink: 0;
}
nav[data-site-nav] a[data-route]:hover {
  color: var(--deep-cobalt);
  background: rgba(111, 182, 217, 0.14);
}
nav[data-site-nav] a[data-route][aria-current="page"] {
  background: var(--deep-cobalt);
  color: var(--frost-white);
}

/* Override source CSS that hid .sitetabs below 760px — shared shell never hides nav */
.sitetabs { display: flex !important; }

body {
  padding-top: var(--nav-h);
}

/* Mobile: two-row header, always-visible scrollable tab rail */
@media (max-width: 900px) {
  header.site-shell[data-site-shell="header"] {
    flex-wrap: wrap;
    height: auto;
    min-height: calc(var(--nav-h) + var(--nav-mobile-extra));
    padding: 10px 16px 8px;
    align-items: center;
  }
  header.site-shell .shell-logo { order: 1; }
  header.site-shell .shell-right { order: 2; margin-left: auto; }
  nav[data-site-nav] {
    order: 3;
    position: relative;
    left: auto;
    transform: none;
    width: 100%;
    max-width: 100%;
    margin-top: 8px;
    justify-content: flex-start;
  }
  nav[data-site-nav] a[data-route] {
    padding: 6px 10px;
    font-size: 10px;
    letter-spacing: 0.02em;
  }
  body {
    padding-top: calc(var(--nav-h) + var(--nav-mobile-extra) + 8px) !important;
  }
  /* Amen/QEEG fixed UI that keys off --nav-h */
  #progress-bar,
  #progress {
    top: calc(var(--nav-h) + var(--nav-mobile-extra) + 8px) !important;
  }
}

@media (max-width: 900px) {
  header.site-shell .shell-right.shell-right-hide-narrow {
    display: none;
  }
}

.site-transition[data-site-shell="transition"] {
  margin: 2.5rem auto;
  max-width: var(--maxw);
  padding: 0 24px;
}
.site-transition .transition-card {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--silver-mist);
  border-radius: var(--radius);
  padding: 18px 22px;
  box-shadow: 0 4px 24px var(--shadow-blue);
}
.site-transition .transition-card p {
  margin: 0;
  color: var(--slate-ink);
  font-size: 0.95rem;
  max-width: 48ch;
}
.site-transition .transition-card a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--deep-cobalt);
  color: var(--frost-white);
  padding: 10px 16px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 13px;
  text-decoration: none;
  border: none;
  transition: all var(--ease);
}
.site-transition .transition-card a:hover {
  background: var(--slate-ink);
  transform: translateY(-1px);
}

.site-contact[data-site-shell="contact"] {
  margin: 0 auto 2rem;
  max-width: var(--maxw);
  padding: 0 24px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
}
.site-contact a {
  color: var(--deep-cobalt);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--glacier-blue);
}
.site-contact a:hover {
  color: var(--arctic-cyan);
  border-color: var(--arctic-cyan);
}

/* Home enrichment — imagery only, no new clinical prose */
[data-home-enrichment] {
  margin: 1.5rem 0 0;
}
[data-home-enrichment] .enrich-frame {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--silver-mist);
  background: rgba(255, 255, 255, 0.55);
  box-shadow: 0 4px 24px var(--shadow-blue);
}
[data-home-enrichment] img {
  display: block;
  width: 100%;
  height: auto;
}
[data-home-enrichment] .enrich-caption {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--arctic-cyan);
  padding: 10px 14px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  .fade-in {
    opacity: 1 !important;
    transform: none !important;
  }
}