/**
 * Shared top navigation — same metrics, type, and states as Track 1 hub.
 * Load after styles/design-system.css and styles/ld-nav-dropdowns.css.
 * Track pages: short aliases (--bgg, --nh, --r1, …) come from track-hub-shell.css.
 *
 * Landing uses html { font-size: 17px }; Track 1 hubs use 16px. Nav typography
 * must match Track 1, so this bar uses font-size: 16px and em (not rem) for
 * measurements tied to that baseline — rem here would follow the root and look
 * larger on the homepage.
 */

.ld-nav,
.ld-nav-inner,
.ld-nlinks {
  overflow: visible;
}

.ld-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nh, var(--qd-layout-nav-height));
  display: flex;
  align-items: center;
  /* Track 1 hub html is 16px — lock nav typography to that scale */
  font-size: 16px;
  font-family: var(--qd-font-sans, 'IBM Plex Sans', system-ui, sans-serif);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding: 0 1.5em;
  background: var(--bgg, var(--qd-navbar-bg, var(--qd-color-glass)));
  backdrop-filter: blur(24px) saturate(1.6);
  -webkit-backdrop-filter: blur(24px) saturate(1.6);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--qd-motion-easing-standard, cubic-bezier(0.4, 0, 0.2, 1));
}

.ld-nav.scrolled {
  border-bottom-color: var(--brs, var(--qd-color-border-subtle));
}

.ld-nav-inner {
  max-width: var(--max, var(--qd-layout-container-max));
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5em;
}

.ld-logo {
  display: flex;
  align-items: center;
  gap: 0.55em;
  font-family: var(--qd-font-mono, 'IBM Plex Mono', ui-monospace, monospace);
  font-size: 0.9em;
  font-weight: 500;
  color: var(--tp, var(--qd-color-text-primary));
  transition: opacity 0.2s;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.ld-logo:hover {
  opacity: 0.72;
}

.ld-logo-box {
  width: 32px;
  height: 32px;
  border-radius: var(--r1, var(--qd-track-r1, var(--qd-radius-sm)));
  background: linear-gradient(
    135deg,
    var(--t1, var(--qd-color-accent-success)),
    var(--cy, var(--qd-color-accent-cyan))
  );
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 22px rgba(16, 185, 129, 0.28);
  overflow: hidden;
  padding: 0;
}

.ld-logo-box .qd-mark {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.ld-nlinks {
  display: flex;
  align-items: center;
  gap: 0.1em;
  font-family: inherit;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.ld-nav .ld-nlinks > a,
.ld-nav .ld-nlinks .ld-dropdown-trigger {
  font-size: 0.84em;
  font-weight: 500;
  color: var(--ts, var(--qd-color-text-secondary));
  padding: 0.4em 0.75em;
  border-radius: var(--r1, var(--qd-track-r1, var(--qd-radius-sm)));
  transition: color 0.2s, background 0.2s;
  line-height: 1.45;
}

.ld-nav .ld-nlinks > a:hover,
.ld-nav .ld-nlinks .ld-dropdown-trigger:hover {
  color: var(--tp, var(--qd-color-text-primary));
  background: rgba(255, 255, 255, 0.05);
}

.ld-nav .ld-nlinks > a.active,
.ld-nav .ld-nlinks > a.home-active,
.ld-nav .ld-nlinks > a.tracks-active,
.ld-nav .ld-nlinks > a.sim-active,
.ld-nav .ld-nlinks > a.about-active,
.ld-nav .ld-nlinks > a.support-active,
.ld-nav .ld-nlinks > a.lab-active,
.ld-nav .ld-nlinks .ld-dropdown-trigger.active,
.ld-nav .ld-nlinks .ld-dropdown-trigger.lab-active,
.ld-nav .ld-nlinks .ld-dropdown-trigger.sim-active,
.ld-nav .ld-nlinks .ld-dropdown-trigger.about-active,
.ld-nav .ld-nlinks .ld-dropdown-trigger.support-active {
  color: var(--tp, var(--qd-color-text-primary));
  background: rgba(255, 255, 255, 0.06);
}

.ld-nav-right {
  display: flex;
  align-items: center;
  gap: 0.5em;
}

.ld-tbtn {
  width: 36px;
  height: 36px;
  border-radius: var(--r1, var(--qd-track-r1, var(--qd-radius-sm)));
  border: 1px solid var(--br, var(--qd-color-border-default));
  background: var(--bg2, var(--qd-color-bg-surface-2));
  color: var(--ts, var(--qd-color-text-secondary));
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, color 0.2s;
}

.ld-tbtn:hover {
  border-color: var(--t1bd, var(--qd-color-accent-success-border));
  color: var(--t1, var(--qd-color-accent-success));
}

.ld-tbtn svg {
  width: 15px;
  height: 15px;
}

.ld-theme-icon-hidden {
  display: none;
}

.ld-ncta {
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
  padding: 0.44em 1.1em;
  border-radius: 999px;
  background: var(--t1, var(--qd-color-accent-success));
  color: #062516;
  font-family: inherit;
  font-size: 0.82em;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.35;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: transform 0.2s var(--qd-motion-easing-standard, ease),
    box-shadow 0.2s var(--qd-motion-easing-standard, ease);
}

.ld-ncta:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 22px rgba(16, 185, 129, 0.28);
}

.ld-hbg {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 36px;
  height: 36px;
  border-radius: var(--r1, var(--qd-track-r1, var(--qd-radius-sm)));
  border: 1px solid var(--br, var(--qd-color-border-default));
  background: var(--bg2, var(--qd-color-bg-surface-2));
  cursor: pointer;
}

.ld-hbg span {
  display: block;
  width: 16px;
  height: 1.5px;
  background: var(--ts, var(--qd-color-text-secondary));
  border-radius: 2px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.ld-hbg.open span:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}

.ld-hbg.open span:nth-child(2) {
  opacity: 0;
}

.ld-hbg.open span:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

/* Sibling of <nav> on many pages — not inside .ld-nav, so set its own 16px base */
.ld-mob {
  display: none;
  position: fixed;
  top: var(--nh, var(--qd-layout-nav-height));
  left: 0;
  right: 0;
  font-size: 16px;
  font-family: var(--qd-font-sans, 'IBM Plex Sans', system-ui, sans-serif);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: var(--bg1, var(--qd-color-bg-surface-1));
  border-bottom: 1px solid var(--brs, var(--qd-color-border-default));
  padding: 1em 1.5em 1.5em;
  flex-direction: column;
  gap: 0.25em;
  z-index: 999;
}

.ld-mob.open {
  display: flex;
}

.ld-mob a {
  padding: 0.5em 0.75em;
  border-radius: var(--r1, var(--qd-track-r1, var(--qd-radius-sm)));
  font-size: 0.9em;
  color: var(--ts, var(--qd-color-text-secondary));
  transition: color 0.2s, background 0.2s;
  font-family: inherit;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.ld-mob a:hover {
  color: var(--tp, var(--qd-color-text-primary));
  background: var(--br, var(--qd-color-border-subtle));
}

.ld-mob-go {
  margin-top: 0.4em;
  padding: 0.5em 0.75em;
  text-align: center;
  font-weight: 700;
  border-radius: var(--r1, var(--qd-track-r1, var(--qd-radius-md)));
  background: var(--t1, var(--qd-color-accent-success)) !important;
  color: #062516 !important;
}

@media (max-width: 1024px) {
  .ld-nlinks {
    display: none;
  }

  .ld-hbg {
    display: flex;
  }

  .ld-ncta {
    display: none;
  }
}

@media (max-width: 640px) {
  .ld-nav {
    padding-left: var(--qd-space-4);
    padding-right: var(--qd-space-4);
  }
}

[data-theme='light'] .ld-nav {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
}

[data-theme='light'] .ld-nav.scrolled {
  border-bottom-color: rgba(0, 0, 0, 0.1);
  box-shadow: 0 1px 16px rgba(0, 0, 0, 0.07);
}

[data-theme='light'] .ld-nav .ld-nlinks > a:hover,
[data-theme='light'] .ld-nav .ld-nlinks .ld-dropdown-trigger:hover {
  background: rgba(0, 0, 0, 0.05);
}

[data-theme='light'] .ld-nav .ld-nlinks > a.active,
[data-theme='light'] .ld-nav .ld-nlinks > a.home-active,
[data-theme='light'] .ld-nav .ld-nlinks > a.tracks-active,
[data-theme='light'] .ld-nav .ld-nlinks > a.sim-active,
[data-theme='light'] .ld-nav .ld-nlinks > a.about-active,
[data-theme='light'] .ld-nav .ld-nlinks > a.support-active,
[data-theme='light'] .ld-nav .ld-nlinks > a.lab-active,
[data-theme='light'] .ld-nav .ld-nlinks .ld-dropdown-trigger.active,
[data-theme='light'] .ld-nav .ld-nlinks .ld-dropdown-trigger.lab-active,
[data-theme='light'] .ld-nav .ld-nlinks .ld-dropdown-trigger.sim-active,
[data-theme='light'] .ld-nav .ld-nlinks .ld-dropdown-trigger.about-active,
[data-theme='light'] .ld-nav .ld-nlinks .ld-dropdown-trigger.support-active {
  background: rgba(0, 0, 0, 0.06);
}

[data-theme='light'] .ld-tbtn {
  background: #f0f3f8;
  border-color: rgba(0, 0, 0, 0.12);
  color: #4a5568;
}

[data-theme='light'] .ld-tbtn:hover {
  border-color: var(--qd-color-accent-success-border);
  background: var(--qd-color-accent-success-muted);
  color: var(--qd-color-accent-success);
}

[data-theme='light'] .ld-hbg {
  background: #f0f3f8;
  border-color: rgba(0, 0, 0, 0.12);
}

[data-theme='light'] .ld-hbg span {
  background: #4a5568;
}

[data-theme='light'] .ld-mob {
  background: #ffffff;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}