/* nav.css */

.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 100;
  padding-block: 1.1rem;
  transition: background var(--dur-med) var(--ease-out), box-shadow var(--dur-med) var(--ease-out), padding var(--dur-med) var(--ease-out);
}
.site-header.is-scrolled {
  background: var(--color-glass);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  box-shadow: 0 1px 0 var(--color-border);
  padding-block: 0.7rem;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
}
.nav-brand img {
  width: 34px; height: 34px;
  border-radius: 8px;
  object-fit: cover;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.nav-links a {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding-block: 4px;
  transition: color var(--dur-fast) var(--ease-out);
}
.nav-links a::after {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 0; height: 1.5px;
  background: var(--color-gold-bright);
  transition: width var(--dur-fast) var(--ease-out);
}
.nav-links a:hover,
.nav-links a:focus-visible { color: var(--color-text); }
.nav-links a:hover::after,
.nav-links a:focus-visible::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: var(--space-2); }

.theme-toggle {
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  display: grid;
  place-items: center;
  transition: transform var(--dur-fast) var(--ease-out), border-color var(--dur-fast);
}
.theme-toggle:hover { transform: rotate(20deg); border-color: var(--color-gold); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: none; }
[data-theme='dark'] .theme-toggle .icon-moon { display: none; }
[data-theme='dark'] .theme-toggle .icon-sun { display: block; }

.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  position: relative;
}
.nav-toggle span, .nav-toggle::before, .nav-toggle::after {
  content: '';
  position: absolute;
  left: 12px; right: 12px;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--dur-fast) var(--ease-out), opacity var(--dur-fast);
}
.nav-toggle::before { top: 15px; }
.nav-toggle span { top: 20px; }
.nav-toggle::after { top: 25px; }
.nav-toggle.is-open::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle.is-open::after { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle.is-open span { opacity: 0; }

@media (max-width: 860px) {
  .nav-links {
    position: fixed;
    top: 68px; right: 1rem; left: 1rem;
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-m);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-2);
    gap: 0;
    box-shadow: var(--shadow-lift);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--dur-med) var(--ease-out), opacity var(--dur-med) var(--ease-out);
  }
  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-links a { padding: 0.85rem 0.75rem; border-radius: 10px; }
  .nav-links a:hover { background: var(--color-surface); }
  .nav-toggle { display: block; }
}