/* ==========================================================================
   AFOLAOLA — Global Navigation
   ========================================================================== */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem var(--container-pad);
  background: transparent;
  transition: background-color var(--dur-med) var(--ease-out), border-color var(--dur-med) var(--ease-out), padding var(--dur-med) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.nav.is-scrolled {
  background: var(--color-bg-overlay);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--color-line-soft);
  padding-block: 0.85rem;
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  z-index: 2;
}

.nav__brand-mark {
  width: 1.85rem;
  height: 1.85rem;
  flex-shrink: 0;
}

.nav__brand-text {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.nav__logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.nav__logo strong { color: var(--color-honor); }

.nav__tagline {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: var(--ls-wide);
  color: var(--color-text-faint);
  white-space: nowrap;
}

@media (max-width: 900px) {
  .nav__tagline { display: none; }
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__link {
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.5rem 0;
  transition: color var(--dur-fast) var(--ease-out);
}
.nav__link:hover, .nav__link:focus-visible { color: var(--color-text); }
.nav__link.is-active { color: var(--color-honor); }

.nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1.5px;
  background: var(--color-honor);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease-out);
}
.nav__link:hover::after { transform: scaleX(1); }

/* dropdown */
.nav__item--dropdown {
  position: relative;
}
.nav__dropdown {
  position: absolute;
  top: calc(100% + 0.75rem);
  left: 50%;
  transform: translateX(-50%) translateY(6px);
  background: var(--color-bg-raised);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  min-width: 220px;
  box-shadow: var(--shadow-soft);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out), visibility var(--dur-fast);
}
.nav__item--dropdown:hover .nav__dropdown,
.nav__item--dropdown:focus-within .nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.nav__dropdown a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
}
.nav__dropdown a:hover, .nav__dropdown a:focus-visible {
  background: var(--color-line-soft);
  color: var(--color-honor);
}
.nav__dropdown .tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--color-text-faint);
  border: 1px solid var(--color-line);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-pill);
}

.nav__right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  z-index: 2;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.35rem;
  height: 2.35rem;
  border-radius: 50%;
  border: 1px solid var(--color-line);
  color: var(--color-text-muted);
  transition: color var(--dur-fast), border-color var(--dur-fast), transform var(--dur-fast);
}
.theme-toggle:hover { color: var(--color-honor); border-color: var(--color-honor); transform: rotate(20deg); }
.theme-toggle svg { width: 1.1rem; height: 1.1rem; }
[data-theme="light"] .theme-toggle .icon-moon,
:root:not([data-theme]) .theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: block; }
.theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun,
:root:not([data-theme]) .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon,
:root:not([data-theme]) .theme-toggle .icon-moon { display: block; }

.nav__menu-btn {
  display: none;
  width: 2.35rem;
  height: 2.35rem;
  align-items: center;
  justify-content: center;
}
.nav__menu-btn span, .nav__menu-btn::before, .nav__menu-btn::after {
  content: "";
  position: absolute;
  width: 1.35rem;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-fast) var(--ease-out);
}
.nav__menu-btn::before { transform: translateY(-6px); }
.nav__menu-btn::after { transform: translateY(6px); }
.nav__menu-btn.is-open::before { transform: rotate(45deg); }
.nav__menu-btn.is-open::after { transform: rotate(-45deg); }
.nav__menu-btn.is-open span { opacity: 0; }

@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__menu-btn { display: inline-flex; position: relative; }

  .nav__mobile {
    position: fixed;
    inset: 0;
    background: var(--color-bg);
    padding: 6rem var(--container-pad) 3rem;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    transform: translateX(100%);
    transition: transform var(--dur-med) var(--ease-in-out);
    overflow-y: auto;
  }
  .nav__mobile.is-open { transform: translateX(0); }
  .nav__mobile a {
    font-family: var(--font-display);
    font-size: 1.4rem;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--color-line);
    color: var(--color-text);
  }
  .nav__mobile .nav__mobile-sub {
    display: flex;
    flex-direction: column;
    padding-left: 1rem;
    gap: 0;
  }
  .nav__mobile .nav__mobile-sub a {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text-muted);
    border-bottom: none;
    padding: 0.5rem 0;
  }
  .nav__mobile .btn { margin-top: var(--space-md); align-self: flex-start; }
}