/**
 * Touge Atlas - shared site navigation
 * One source of truth for the fixed top bar across every page.
 * Desktop: horizontal bar (56px, unchanged look).
 * Mobile (<=768px): accessible hamburger + slide-down menu.
 * Self-contained: only depends on tokens present on every page, all with fallbacks.
 */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 10, 0.75);
  backdrop-filter: blur(16px) saturate(1.6);
  -webkit-backdrop-filter: blur(16px) saturate(1.6);
  border-bottom: 1px solid var(--border, rgba(255, 255, 255, 0.08));
}

.site-nav .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 56px;
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 clamp(16px, 5vw, 96px);
  padding-left: max(clamp(16px, 5vw, 96px), env(safe-area-inset-left));
  padding-right: max(clamp(16px, 5vw, 96px), env(safe-area-inset-right));
}

.site-nav .nav-logo {
  font-family: 'Inter', sans-serif;
  font-weight: 800;
  font-size: 15px;
  letter-spacing: 0.06em;
  display: flex;
  gap: 6px;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.site-nav .nav-logo .w { color: var(--fg-1, #E6E1E5); }
.site-nav .nav-logo .r { color: var(--red, #DC2626); text-shadow: 0 0 8px rgba(220, 38, 38, 0.4); }

.site-nav .nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}

.site-nav .nav-links a {
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-3, #938F99);
  letter-spacing: 0.01em;
  text-decoration: none;
  transition: color 0.15s ease;
}
.site-nav .nav-links a:hover,
.site-nav .nav-links a.active { color: var(--fg-1, #E6E1E5); }

.site-nav .nav-links .lang {
  display: flex;
  align-items: center;
  gap: 8px;
}
.site-nav .nav-links .lang a { color: var(--fg-3, #938F99); }
.site-nav .nav-links .lang a.active { color: var(--fg-1, #E6E1E5); }

.site-nav .nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 7px 16px;
  border-radius: 8px;
  background: var(--red, #DC2626);
  color: #fff !important;
  font-size: 13px;
  font-weight: 600;
  box-shadow: 0 0 14px rgba(220, 38, 38, 0.35);
  transition: background 0.2s ease, box-shadow 0.2s ease, transform 0.2s var(--ease-spring, cubic-bezier(0.34, 1.56, 0.64, 1));
}
.site-nav .nav-cta:hover {
  background: var(--red-hot, #B91C1C);
  box-shadow: 0 0 20px rgba(220, 38, 38, 0.5);
  transform: translateY(-1px);
}

/* Hamburger toggle (hidden on desktop) */
.site-nav .nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  margin-right: -8px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--fg-1, #E6E1E5);
  cursor: pointer;
  border-radius: 10px;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
.site-nav .nav-toggle:focus-visible {
  outline: 2px solid var(--red, #DC2626);
  outline-offset: 2px;
}

.site-nav .nav-toggle__bars,
.site-nav .nav-toggle__bars::before,
.site-nav .nav-toggle__bars::after {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.24s ease, opacity 0.18s ease;
}
.site-nav .nav-toggle__bars { position: relative; }
.site-nav .nav-toggle__bars::before { position: absolute; top: -6px; left: 0; }
.site-nav .nav-toggle__bars::after { position: absolute; top: 6px; left: 0; }

/* Hamburger -> X when open */
.site-nav.is-open .nav-toggle__bars { background: transparent; }
.site-nav.is-open .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.site-nav.is-open .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Mobile ---------- */
@media (max-width: 768px) {
  .site-nav .nav-toggle { display: inline-flex; }

  .site-nav .nav-links {
    position: absolute;
    top: 100%;
    left: 12px;
    right: 12px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    margin-top: 8px;
    padding: 10px;
    border-radius: 16px;
    border: 1px solid var(--border, rgba(255, 255, 255, 0.12));
    background: rgba(16, 16, 18, 0.98);
    backdrop-filter: blur(16px) saturate(1.6);
    -webkit-backdrop-filter: blur(16px) saturate(1.6);
    box-shadow: 0 22px 48px rgba(0, 0, 0, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    max-height: min(72vh, 480px);
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;

    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px) scale(0.985);
    transform-origin: top center;
    transition: opacity 0.2s ease, transform 0.24s cubic-bezier(0.2, 0.8, 0.2, 1), visibility 0s linear 0.24s;
  }

  .site-nav.is-open .nav-links {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) scale(1);
    transition-delay: 0s;
  }

  .site-nav .nav-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 48px;
    padding: 0 12px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    color: var(--fg-1, #E6E1E5);
  }
  .site-nav .nav-links a:hover,
  .site-nav .nav-links a:focus-visible {
    background: rgba(255, 255, 255, 0.06);
    outline: none;
  }
  .site-nav .nav-links a.active {
    background: linear-gradient(90deg, rgba(220, 38, 38, 0.22), rgba(220, 38, 38, 0.06) 75%, transparent);
  }

  .site-nav .nav-links .lang {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
    margin: 6px 0;
    padding: 6px;
    border: 1px solid var(--border, rgba(255, 255, 255, 0.12));
    border-radius: 999px;
  }
  .site-nav .nav-links .lang a {
    min-height: 40px;
    border-radius: 999px;
    font-size: 14px;
  }
  .site-nav .nav-links .lang a.active {
    background: rgba(220, 38, 38, 0.26);
    color: #fff;
  }

  .site-nav .nav-cta {
    justify-content: center;
    min-height: 48px;
    margin-top: 2px;
    font-size: 15px;
  }
  .site-nav .nav-cta:hover { transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  .site-nav .nav-links,
  .site-nav .nav-toggle__bars,
  .site-nav .nav-toggle__bars::before,
  .site-nav .nav-toggle__bars::after,
  .site-nav .nav-cta { transition: none; }
}