/* ==========================================================================
   OpenCode Terminal Brutalist — Navigation
   Based on opencode.ai DESIGN.md
   ========================================================================== */

/* -- Desktop nav bar ----------------------------------------------------- */

.page-nav {
  position: relative;
  height: 80px;
  border-bottom: 1px solid var(--oc-rule);
  display: flex;
  align-items: center;
  padding: 0 var(--oc-gutter);
}

.page-nav::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 100vw;
  border-top: 1px solid var(--oc-rule);
  transform: translateX(-50%);
}

.page-nav nav {
  display: flex;
  align-items: center;
  width: 100%;
  gap: var(--oc-space-lg);
}

.nav-logo {
  font-family: var(--font-mono-brand);
  font-size: 16px;
  font-weight: 700;
  line-height: 24px;
  color: var(--oc-ink-strong);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-logo:hover {
  color: var(--oc-ink);
}

/* -- Nav links ----------------------------------------------------------- */

.nav-links {
  list-style: none;
  display: flex;
  align-items: center;
  gap: var(--oc-space-md);
  margin: 0;
  padding: 0;
  flex: 1;
}

.nav-links li {
  list-style: none;
}

.nav-links a {
  font-family: var(--font-mono-brand);
  font-size: 16px;
  font-weight: 400;
  line-height: 24px;
  color: var(--oc-ink-muted);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--oc-ink-strong);
  border-bottom-color: var(--oc-ink-strong);
}

/* -- Social links in nav ------------------------------------------------- */

.nav-social {
  display: flex;
  align-items: center;
  gap: var(--oc-space-sm);
  list-style: none;
  margin: 0;
  padding: 0;
  flex-shrink: 0;
}

.nav-social li {
  list-style: none;
}

.nav-social a {
  color: var(--oc-ink-subtle);
  font-size: 16px;
  text-decoration: none;
  padding: 4px;
}

.nav-social a:hover {
  color: var(--oc-ink);
}

/* -- Mobile toggle button ------------------------------------------------ */

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--oc-rule);
  color: var(--oc-ink-muted);
  font-family: var(--font-mono-brand);
  font-size: 16px;
  padding: 8px 16px;
  cursor: pointer;
  border-radius: var(--oc-radius-sm);
  margin-left: auto;
}

.nav-toggle:hover {
  color: var(--oc-ink-strong);
  border-color: var(--oc-ink-subtle);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--oc-focus);
  outline-offset: 0;
}

.theme-toggle {
  display: inline-flex;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  border: 1px solid var(--oc-rule);
  border-radius: var(--oc-radius-sm);
  background: transparent;
  color: var(--oc-ink-subtle);
  font: inherit;
  line-height: 1;
  cursor: pointer;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.theme-toggle:hover {
  border-color: var(--oc-ink-subtle);
  background: var(--oc-surface-raised);
  color: var(--oc-ink-strong);
}

/* -- Mobile overlay ------------------------------------------------------ */

.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--oc-canvas);
  z-index: 100;
  flex-direction: column;
  padding: var(--oc-gutter);
  overflow-y: auto;
}

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

.nav-overlay-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--oc-space-xl);
}

.nav-overlay-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.nav-overlay-title {
  font-family: var(--font-mono-brand);
  font-size: 16px;
  font-weight: 700;
  color: var(--oc-ink-strong);
  text-decoration: none;
}

.nav-overlay-close {
  background: none;
  border: 1px solid var(--oc-rule);
  color: var(--oc-ink-muted);
  font-family: var(--font-mono-brand);
  font-size: 16px;
  padding: 8px 16px;
  cursor: pointer;
  border-radius: var(--oc-radius-sm);
}

.nav-overlay-close:hover {
  color: var(--oc-ink-strong);
  border-color: var(--oc-ink-subtle);
}

.nav-overlay-close:focus-visible {
  outline: 2px solid var(--oc-focus);
  outline-offset: 0;
}

.nav-overlay-links {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--oc-space-sm);
}

.nav-overlay-links li {
  list-style: none;
}

.nav-overlay-links a {
  font-family: var(--font-mono-brand);
  font-size: 24px;
  font-weight: 700;
  line-height: 36px;
  color: var(--oc-ink-muted);
  text-decoration: none;
  display: block;
  padding: var(--oc-space-sm) 0;
}

.nav-overlay-links a:hover,
.nav-overlay-links a.active {
  color: var(--oc-ink-strong);
}

.nav-overlay-links a:focus-visible {
  outline: 2px solid var(--oc-focus);
  outline-offset: 0;
}

/* -- Responsive ---------------------------------------------------------- */

@media (max-width: 768px) {
  .page-nav {
    padding: 0 var(--oc-gutter-m);
  }

  .nav-links {
    display: none;
  }

  .nav-social {
    display: none;
  }

  .nav-toggle {
    display: block;
  }
}