/* ── Shared Navigation Header ── */

#app-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 600;
  height: 56px; background: rgba(9, 18, 33, 0.96);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  display: flex; align-items: center; justify-content: space-between; padding: 0 32px;
}

.nav-links {
  display: flex; align-items: center; gap: 4px;
}

#app-nav .nav-link {
  font-family: var(--font-mono); font-size: 10px; text-transform: uppercase;
  letter-spacing: 0.12em; color: rgba(255,255,255,0.35);
  background: none; border: none; cursor: pointer;
  padding: 6px 12px; border-radius: 4px; transition: color 0.2s; position: relative;
  text-decoration: none; display: inline-block;
}
#app-nav .nav-link:hover { color: rgba(255,255,255,0.7); }
#app-nav .nav-link.active { color: var(--teal-mid); }
#app-nav .nav-link.active::after {
  content: ''; position: absolute; bottom: -1px; left: 12px; right: 12px;
  height: 2px; background: var(--teal); border-radius: 1px;
}

.nav-hamburger {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; background: none; border: none; padding: 6px;
}
.nav-hamburger span {
  display: block; width: 20px; height: 2px;
  background: rgba(255,255,255,0.5); border-radius: 1px; transition: all 0.2s;
}

.nav-mobile-menu {
  position: fixed; top: 56px; left: 0; right: 0; z-index: 599;
  background: rgba(9, 18, 33, 0.99);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  padding: 8px 24px 16px; display: none; flex-direction: column; gap: 0;
}
.nav-mobile-menu.open { display: flex; }

.nav-mobile-link {
  font-family: var(--font-mono); font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.12em; color: rgba(255,255,255,0.5);
  background: none; border: none; cursor: pointer; padding: 13px 4px;
  text-align: left; border-bottom: 1px solid rgba(255,255,255,0.05); transition: color 0.2s;
  text-decoration: none; display: block;
}
.nav-mobile-link:hover, .nav-mobile-link.active { color: var(--teal-mid); }
.nav-mobile-link:last-child { border-bottom: none; }

.nav-mobile-feedback {
  font-family: var(--font-mono); font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.12em; color: rgba(255,255,255,0.35);
  background: none; border: 1px solid rgba(255,255,255,0.12);
  border-radius: 3px; cursor: pointer; padding: 11px 4px;
  text-align: left; transition: all 0.2s; display: block; width: 100%;
  margin-top: 4px;
}
.nav-mobile-feedback:hover { border-color: var(--teal); color: var(--teal-mid); }

/* Nav login button */
.nav-login-btn {
  font-family: var(--font-mono); font-size: 9px; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--teal-mid); background: none;
  border: 1px solid var(--teal-mid); border-radius: 3px; cursor: pointer;
  padding: 5px 10px; transition: all 0.2s; margin-left: 8px;
  white-space: nowrap; text-decoration: none; display: inline-block;
}
.nav-login-btn:hover { background: rgba(93,202,165,0.1); }
.nav-mobile-login {
  font-family: var(--font-mono); font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.12em; color: var(--teal-mid); background: none;
  border: 1px solid rgba(93,202,165,0.3); border-radius: 3px; cursor: pointer;
  padding: 11px 4px; text-align: left; transition: all 0.2s;
  display: block; width: 100%; margin-top: 4px; text-decoration: none;
}
.nav-mobile-login:hover { border-color: var(--teal-mid); background: rgba(93,202,165,0.06); }

/* Nav feedback button */
.nav-feedback-btn {
  font-family: var(--font-mono); font-size: 9px; text-transform: uppercase;
  letter-spacing: 0.1em; color: rgba(255,255,255,0.35);
  background: none; border: 1px solid rgba(255,255,255,0.12);
  border-radius: 3px; cursor: pointer; padding: 5px 10px;
  transition: all 0.2s; margin-left: 8px; white-space: nowrap;
}
.nav-feedback-btn:hover { border-color: var(--teal); color: var(--teal-mid); }

/* Studio view-toggle (header extra) */
.view-toggle { display: flex; gap: 3px; align-items: center; margin-left: 16px; }
.view-btn {
  font-family: var(--font-mono); font-size: 9px; text-transform: uppercase; letter-spacing: 0.08em;
  background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.1); color: rgba(255,255,255,0.35);
  padding: 5px 10px; border-radius: 3px; cursor: pointer; transition: 0.2s; white-space: nowrap;
}
.view-btn:hover { border-color: rgba(93,202,165,0.4); color: rgba(255,255,255,0.7); }
.view-btn.active { background: rgba(29,158,117,0.12); border-color: var(--teal-mid); color: var(--teal-mid); }

@media (max-width: 650px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .view-toggle { display: none; }
  .nav-feedback-btn { display: none; }
}

/* ── Datum FI Glossary Tooltips ── */
.df-tooltip {
  border-bottom: 1px dotted rgba(93,202,165,0.5);
  cursor: help;
  position: relative;
  display: inline;
}
.df-tooltip::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: #060b14;
  border: 1px solid rgba(93,202,165,0.3);
  border-radius: 6px;
  padding: 10px 14px;
  font-family: 'DM Mono', monospace;
  font-size: 11px;
  font-style: normal;
  font-weight: 400;
  color: rgba(255,255,255,0.8);
  line-height: 1.5;
  width: 240px;
  white-space: normal;
  z-index: 1000;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.15s ease;
  box-shadow: 0 8px 24px rgba(0,0,0,0.6);
}
.df-tooltip:hover::after,
.df-tooltip:focus::after {
  opacity: 1;
}
/* Keep tooltip on-screen at page edges */
.df-tooltip.tip-right::after { left: 0; transform: none; }
.df-tooltip.tip-left::after  { left: auto; right: 0; transform: none; }
@media (max-width: 650px) {
  .df-tooltip::after { width: 200px; font-size: 10px; }
}

/* ── Accessibility: Skip Link (3D) ── */
.skip-link {
  position: absolute; top: -40px; left: 8px; z-index: 9999;
  background: var(--gold); color: var(--bg-navy);
  font-family: var(--font-mono); font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.1em; padding: 8px 16px; border-radius: 4px;
  text-decoration: none; transition: top 0.15s;
}
.skip-link:focus { top: 8px; }

/* ── Accessibility: Focus Visible (3C) ── */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--teal-mid);
  outline-offset: 2px;
}

/* ── Accessibility: Global Reduced Motion (3A) ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}