/* ═══════════════════════════════════════════════════════════════
   OmicsLab — Navigation (4-group desktop + full-screen mobile overlay)
   ═══════════════════════════════════════════════════════════════ */

/* ── Override landing-nav to flex with new slots ── */
.landing-nav {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 0;
  padding: 0 1.5rem;
  height: 56px;
  position: sticky;
  top: 0;
  z-index: 500;
  background: rgba(13,17,23,0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid #21262d;
}

/* Make logo a clickable link without changing existing logo styles */
.logo-mark {
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
  grid-column: 1;
  text-decoration: none;
}

/* ── Desktop primary nav ── */
.nav-primary {
  grid-column: 2;
  display: flex;
  align-items: center;
  gap: 0.15rem;
  padding-left: 1.5rem;
}

/* Nav group container */
.nav-group {
  position: relative;
}

/* Each top-level button */
.nav-group-btn {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.45rem 0.8rem;
  background: none;
  border: none;
  border-radius: 8px;
  color: #8b949e;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  font-family: 'Sora', 'Inter', system-ui, sans-serif;
  transition: color 0.15s, background 0.15s;
  white-space: nowrap;
  position: relative;
}
.nav-group-btn:hover { color: #e6edf3; background: rgba(255,255,255,0.05); }

/* Institutions / Pricing direct tab */
.nav-pricing-btn {
  background: rgba(63,185,80,0.1) !important;
  border: 1px solid rgba(63,185,80,0.35) !important;
  color: #3fb950 !important;
  border-radius: 6px !important;
  font-weight: 700 !important;
  padding: 0.3rem 0.85rem !important;
  margin-left: 0.25rem;
}
.nav-pricing-btn:hover {
  background: rgba(63,185,80,0.2) !important;
  color: #4fc862 !important;
}
.nav-group-btn.active { color: #e6edf3; }
.nav-group-btn.active::after {
  content: '';
  position: absolute;
  bottom: -13px; left: 50%;
  transform: translateX(-50%);
  width: 20px; height: 2px;
  background: #3fb950;
  border-radius: 1px;
}

/* Caret rotates on group hover */
.nav-caret-svg {
  flex-shrink: 0;
  transition: transform 0.18s ease;
  opacity: 0.6;
}
.nav-group:hover .nav-caret-svg,
.nav-group:focus-within .nav-caret-svg { transform: rotate(180deg); opacity: 1; }

/* ── Mega dropdown ── */
.nav-mega-drop {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  background: #161b22;
  border: 1px solid #30363d;
  border-radius: 14px;
  padding: 1rem 1.25rem;
  display: none;
  gap: 0;
  min-width: 340px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.55), 0 0 0 1px rgba(255,255,255,0.04);
  z-index: 600;
  animation: dropIn 0.14s ease;
}
@keyframes dropIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-6px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}
.nav-group:hover .nav-mega-drop,
.nav-group:focus-within .nav-mega-drop { display: flex; }

/* Tools dropdown is wider — 3 columns */
.nmd-tools { min-width: 580px; }

/* Dropdown inner layout */
.nmd-inner { display: flex; gap: 1rem; width: 100%; }
.nmd-col { display: flex; flex-direction: column; gap: 0.1rem; flex: 1; }
.nmd-col + .nmd-col { padding-left: 1rem; border-left: 1px solid #21262d; }

.nmd-label {
  font-size: 0.63rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #484f58;
  padding: 0 0.5rem 0.45rem;
  font-family: 'Inter', system-ui, sans-serif;
}

/* Dropdown items */
.nmd-item {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  padding: 0.6rem 0.65rem;
  background: none;
  border: none;
  border-radius: 9px;
  color: #8b949e;
  font-size: 0.83rem;
  cursor: pointer;
  font-family: 'Inter', system-ui, sans-serif;
  text-align: left;
  width: 100%;
  transition: background 0.1s, color 0.1s;
}
.nmd-item:hover { background: rgba(255,255,255,0.06); color: #e6edf3; }

.nmd-icon {
  width: 28px; height: 28px;
  border-radius: 7px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
  color: #8b949e;
}
.nmd-item:hover .nmd-icon { color: #e6edf3; }
.mob-nav-item-icon { color: #8b949e; }
.mob-nav-item:hover .mob-nav-item-icon { color: #e6edf3; }
.nmd-text { display: flex; flex-direction: column; gap: 0.1rem; }
.nmd-name { font-weight: 600; color: #c9d1d9; font-size: 0.84rem; transition: color 0.1s; }
.nmd-item:hover .nmd-name { color: #e6edf3; }
.nmd-desc { font-size: 0.7rem; color: #484f58; line-height: 1.4; }

.nmd-divider { height: 1px; background: #21262d; margin: 0.4rem 0; }

/* ── Tabbed mega-menus ── */
.nmd-tabbed {
  padding: 0;
  min-width: 340px;
  flex-direction: column;
}
.nmd-tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid #21262d;
  padding: 0.5rem 0.75rem 0;
  overflow-x: auto;
}
.nmd-tab {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: #8b949e;
  font-size: 0.76rem;
  font-weight: 600;
  font-family: 'Inter', system-ui, sans-serif;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
  transition: color 0.12s, border-color 0.12s;
  margin-bottom: -1px;
  border-radius: 5px 5px 0 0;
  white-space: nowrap;
  flex-shrink: 0;
}
.nmd-tab:hover { color: #c9d1d9; }
.nmd-tab.active { color: #e6edf3; border-bottom-color: #3fb950; }
.nmd-tab-panel {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  padding: 0.6rem 0.65rem;
}
.nmd-tab-panel[hidden] { display: none; }

/* ── Right utilities ── */
.nav-right {
  grid-column: 3;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-right: 0.5rem;
}

/* Search button (existing class, override styling) */
.nav-right .nav-search-btn {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  background: rgba(255,255,255,0.04);
  border: 1px solid #30363d;
  border-radius: 8px;
  color: #6e7681;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  font-family: 'Inter', system-ui, sans-serif;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
  white-space: nowrap;
}
.nav-right .nav-search-btn:hover { background: rgba(255,255,255,0.08); color: #c9d1d9; border-color: #484f58; }
.nav-settings-btn { display: flex; align-items: center; justify-content: center; width: 32px; height: 32px; background: none; border: 1px solid transparent; border-radius: 7px; color: #6e7681; cursor: pointer; transition: background .12s, color .12s, border-color .12s; }
.nav-settings-btn:hover { background: rgba(255,255,255,0.06); color: #c9d1d9; border-color: #30363d; }
/* Study music button */
.nav-music-btn {
  display: flex; align-items: center; gap: .35rem;
  padding: .38rem .65rem;
  background: rgba(255,255,255,.04); border: 1px solid #30363d;
  border-radius: 8px; color: #6e7681; font-size: .78rem; font-weight: 500;
  cursor: pointer; font-family: inherit; white-space: nowrap;
  transition: background .12s, color .12s, border-color .12s;
}
.nav-music-btn:hover { background: rgba(255,255,255,.08); color: #c9d1d9; border-color: #484f58; }
.nav-music-btn.sm-playing { color: #3fb950; border-color: rgba(63,185,80,.4); background: rgba(63,185,80,.08); }
.nav-music-btn .sm-label { font-size: .72rem; }
.nav-search-kbd {
  font-size: 0.65rem;
  padding: 0.05rem 0.3rem;
  background: #21262d;
  border-radius: 4px;
  color: #484f58;
  font-family: monospace;
}

/* User identity pill */
.nav-user-pill {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.25rem 0.7rem 0.25rem 0.25rem;
  background: rgba(63,185,80,0.07);
  border: 1px solid rgba(63,185,80,0.18);
  border-radius: 9999px;
  cursor: pointer;
  font-family: 'Inter', system-ui, sans-serif;
  transition: background 0.15s, border-color 0.15s;
  text-align: left;
}
.nav-user-pill:hover {
  background: rgba(63,185,80,0.13);
  border-color: rgba(63,185,80,0.35);
}
.nav-user-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: #3fb950;
  color: #0d1117;
  font-size: 0.65rem;
  font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  letter-spacing: -0.02em;
  font-family: 'Sora', system-ui, sans-serif;
}
.nav-user-info { display: flex; flex-direction: column; gap: 0; }
.nav-user-name {
  font-size: 0.78rem;
  font-weight: 600;
  color: #c9d1d9;
  line-height: 1.2;
  font-family: 'Sora', system-ui, sans-serif;
}
.nav-user-role {
  font-size: 0.62rem;
  color: #484f58;
  line-height: 1;
}
/* When viewing the profile page */
.nav-user-pill.active-pill {
  background: rgba(63,185,80,0.18);
  border-color: rgba(63,185,80,0.5);
  box-shadow: 0 0 0 3px rgba(63,185,80,0.08);
}
/* Sign-in CTA button in nav (shown when logged out) */
.nav-signin-btn {
  display: flex;
  align-items: center;
  padding: .42rem 1rem;
  background: rgba(63,185,80,0.12);
  border: 1px solid rgba(63,185,80,0.4);
  border-radius: 8px;
  color: #3fb950;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: background .14s, border-color .14s, color .14s;
}
.nav-signin-btn:hover {
  background: rgba(63,185,80,0.22);
  border-color: rgba(63,185,80,0.65);
  color: #56d364;
}

/* ── Mobile hamburger ── */
.nav-hamburger {
  grid-column: 4;
  display: none;
  align-items: center;
  justify-content: center;
  width: 38px; height: 38px;
  background: none;
  border: 1px solid #30363d;
  border-radius: 9px;
  color: #8b949e;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
  padding: 0;
}
.nav-hamburger:hover { background: #21262d; color: #e6edf3; }

/* ══════════════════════════════════════════════════════════════
   MOBILE FULL-SCREEN OVERLAY
   ══════════════════════════════════════════════════════════════ */
.mob-overlay {
  position: fixed;
  inset: 0;
  z-index: 9000;
  background: #0d1117;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.mob-overlay[hidden] { display: none !important; }
.mob-overlay.is-open { animation: overlaySlideIn 0.22s cubic-bezier(0.22,1,0.36,1); }
@keyframes overlaySlideIn {
  from { opacity: 0; transform: translateY(-16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Overlay header */
.mob-overlay-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid #21262d;
  position: sticky;
  top: 0;
  background: #0d1117;
  z-index: 1;
  flex-shrink: 0;
}
.mob-overlay-close {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: #21262d;
  border: 1px solid #30363d;
  border-radius: 9px;
  color: #8b949e;
  font-size: 1rem;
  cursor: pointer;
  transition: background 0.12s, color 0.12s;
}
.mob-overlay-close:hover { background: #30363d; color: #e6edf3; }

/* Overlay body */
.mob-overlay-body {
  flex: 1;
  padding: 1.25rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

/* Section grouping */
.mob-nav-section { display: flex; flex-direction: column; gap: 0.1rem; margin-bottom: 0.25rem; }
.mob-nav-section-label {
  font-size: 0.63rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #484f58;
  padding: 0.6rem 0.75rem 0.35rem;
  font-family: 'Inter', system-ui, sans-serif;
}

/* Mobile nav items */
.mob-nav-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.75rem 0.85rem;
  background: none;
  border: none;
  border-radius: 12px;
  color: #c9d1d9;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  font-family: 'Inter', system-ui, sans-serif;
  text-align: left;
  width: 100%;
  transition: background 0.1s;
}
.mob-nav-item:hover { background: rgba(255,255,255,0.05); }

.mob-nav-item-icon {
  width: 38px; height: 38px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}
.mob-nav-item-text { display: flex; flex-direction: column; gap: 0.12rem; }
.mob-nav-item-name { font-weight: 600; color: #e6edf3; font-size: 0.9rem; }
.mob-nav-item-desc { font-size: 0.72rem; color: #6e7681; }

.mob-nav-divider { height: 1px; background: #21262d; margin: 0.5rem 0; }

/* Overlay footer */
.mob-overlay-footer {
  padding: 1rem 1rem 1.5rem;
  border-top: 1px solid #21262d;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6rem;
  flex-shrink: 0;
}
.mob-overlay-footer .mob-footer-cta {
  grid-column: 1 / -1;
}

.mob-footer-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.72rem 1rem;
  border: 1px solid #30363d;
  border-radius: 10px;
  background: none;
  color: #8b949e;
  font-size: 0.83rem;
  font-weight: 600;
  cursor: pointer;
  font-family: 'Inter', system-ui, sans-serif;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.mob-footer-btn:hover { background: #161b22; color: #e6edf3; border-color: #484f58; }
.mob-footer-cta-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 0.85rem 1rem;
  background: #3fb950;
  border: none;
  border-radius: 10px;
  color: #0d1117;
  font-size: 0.9rem;
  font-weight: 800;
  cursor: pointer;
  font-family: 'Sora', system-ui, sans-serif;
  transition: background 0.15s, transform 0.1s;
}
.mob-footer-cta-btn:hover { background: #4ac95e; transform: translateY(-1px); }

/* ══ Responsive ══ */
@media (min-width: 769px) {
  .landing-nav { grid-template-columns: auto 1fr auto auto; }
  .nav-hamburger { display: none !important; }
  .mob-overlay  { display: none !important; }
}

@media (max-width: 768px) {
  .landing-nav { grid-template-columns: 1fr auto; padding: 0 1rem; }
  .nav-primary { display: none; }
  .nav-right   { display: none; }
  .nav-hamburger { display: flex; grid-column: 2; }
  .logo-mark   { grid-column: 1; }
}

@media (max-width: 420px) {
  .landing-nav { padding: 0 0.85rem; }
}

/* ═══════════════════════════════════════════════════════════════
   i18n grouped language selector
   ═══════════════════════════════════════════════════════════════ */
.i18n-toggle-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  margin-left: 0.5rem;
  font-family: 'Noto Sans', 'Inter', system-ui, sans-serif;
}

.i18n-current {
  display: flex; align-items: center; gap: 6px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 8px;
  padding: 5px 10px;
  color: #e6edf3;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.i18n-current:hover { background: rgba(255,255,255,0.11); border-color: rgba(255,255,255,0.2); }
.i18n-current.i18n-loading { opacity: 0.6; pointer-events: none; }
.i18n-current-flag { font-size: 1rem; line-height: 1; }
.i18n-current-label { max-width: 80px; overflow: hidden; text-overflow: ellipsis; }
.i18n-caret { opacity: 0.6; transition: transform 0.2s; flex-shrink: 0; }
.i18n-toggle-wrap.open .i18n-caret { transform: rotate(180deg); }

.i18n-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 900;
  width: 260px;
  max-height: 420px;
  overflow-y: auto;
  background: #161b22;
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  box-shadow: 0 16px 48px rgba(0,0,0,0.6);
  padding: 6px 0;
  scrollbar-width: thin;         /* Firefox / Chrome 121+ */
  scrollbar-color: #30363d transparent;
}
.i18n-dropdown::-webkit-scrollbar { width: 4px; }
.i18n-dropdown::-webkit-scrollbar-track { background: transparent; }
.i18n-dropdown::-webkit-scrollbar-thumb { background: #30363d; border-radius: 2px; }
.i18n-toggle-wrap.open .i18n-dropdown { display: block; }

.i18n-search-wrap { padding: 8px 10px 4px; }
.i18n-search {
  width: 100%;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  padding: 6px 10px;
  color: #e6edf3;
  font-size: 0.78rem;
  outline: none;
  font-family: inherit;
}
.i18n-search::placeholder { color: rgba(255,255,255,0.35); }
.i18n-search:focus { border-color: #3fb950; }

.i18n-group { padding: 4px 0; }
.i18n-group + .i18n-group { border-top: 1px solid rgba(255,255,255,0.06); margin-top: 2px; }
.i18n-group-label {
  padding: 6px 12px 3px;
  font-size: 0.68rem;
  font-weight: 600;
  color: rgba(255,255,255,0.35);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.i18n-group-items { padding: 2px 0; }

.i18n-option {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 7px 12px;
  background: none;
  border: none;
  color: #c9d1d9;
  font-size: 0.83rem;
  font-family: 'Noto Sans', 'Inter', system-ui, sans-serif;
  cursor: pointer;
  transition: background 0.1s;
  text-align: left;
}
.i18n-option:hover { background: rgba(255,255,255,0.07); color: #e6edf3; }
.i18n-option.active { color: #3fb950; }
.i18n-opt-flag { font-size: 1rem; line-height: 1; flex-shrink: 0; }
.i18n-opt-label { flex: 1; }
.i18n-opt-check { color: #3fb950; font-size: 0.8rem; flex-shrink: 0; }

/* RTL support */
body.lang-rtl .i18n-dropdown { right: auto; left: 0; }
body.lang-rtl .i18n-option { flex-direction: row-reverse; text-align: right; }

/* Noto Sans fallback for African script support */
body { font-family: 'Sora', 'Noto Sans', 'Noto Sans Ethiopic', 'Inter', system-ui, sans-serif; }

/* ═══════════════════════════════════════════════════════════════
   Voice TTS speaker button
   ═══════════════════════════════════════════════════════════════ */
.voice-speak-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(63,185,80,0.1);
  border: 1px solid rgba(63,185,80,0.25);
  border-radius: 6px;
  color: #3fb950;
  width: 28px;
  height: 28px;
  cursor: pointer;
  vertical-align: middle;
  margin-left: 8px;
  transition: background 0.15s, border-color 0.15s;
  flex-shrink: 0;
}
.voice-speak-btn:hover { background: rgba(63,185,80,0.2); border-color: rgba(63,185,80,0.45); }
.voice-speak-btn svg { pointer-events: none; }

/* ── Mic denied panel ── */
.vc-mic-denied-panel {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  width: 320px;
  background: #161b22;
  border: 1px solid rgba(255, 107, 107, 0.35);
  border-radius: 12px;
  padding: 1.25rem;
  z-index: 8000;
  box-shadow: 0 8px 32px rgba(0,0,0,0.5);
  animation: vc-slide-up 0.2s ease;
}

@keyframes vc-slide-up {
  from { transform: translateY(12px); opacity: 0; }
  to   { transform: translateY(0); opacity: 1; }
}

.vc-denied-icon {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 107, 107, 0.1);
  border: 1px solid rgba(255, 107, 107, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.85rem;
}

.vc-denied-title {
  font-weight: 700;
  font-size: 0.85rem;
  color: #ff6b6b;
  margin-bottom: 0.75rem;
}

.vc-denied-steps {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.vc-denied-step {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  font-size: 0.74rem;
  color: #c9d1d9;
  line-height: 1.5;
}

.vc-denied-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: #21262d;
  font-size: 0.6rem;
  font-weight: 700;
  color: #58a6ff;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

.vc-denied-btns {
  display: flex;
  gap: 0.5rem;
}

.vc-denied-retry {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.8rem;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: inherit;
  background: #238636;
  border: none;
  border-radius: 6px;
  color: #fff;
  cursor: pointer;
  transition: background 0.15s;
}

.vc-denied-retry:hover { background: #2ea043; }

.vc-denied-close {
  padding: 0.4rem 0.8rem;
  font-size: 0.75rem;
  font-weight: 600;
  font-family: inherit;
  background: transparent;
  border: 1px solid #30363d;
  border-radius: 6px;
  color: #8b949e;
  cursor: pointer;
  transition: background 0.15s;
}

.vc-denied-close:hover { background: #21262d; color: #c9d1d9; }