/* ==============================================
   layout.css — Light theme Header, Footer, Nav
   ============================================== */

/* ── Header ─────────────────────────────────── */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

/* ── Site Logo ──────────────────────────────── */
.site-logo { font-family: var(--font-display); font-size: clamp(1.1rem, 2vw, 1.35rem); font-weight: 700; color: var(--color-primary); display: flex; align-items: center; gap: 0.5rem; text-decoration: none; }
.site-logo:hover { color: var(--color-primary-hover); }

/* ── Desktop Nav ────────────────────────────── */
.site-nav { display: flex; align-items: center; gap: clamp(0.5rem, 2vw, 1.25rem); }

.site-nav a {
  color: var(--color-text-muted);
  font-size: clamp(0.8rem, 1.5vw, 0.9rem);
  font-weight: 500;
  padding: 0.35rem 0.5rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}

.site-nav a:hover { color: var(--color-primary); background: var(--color-surface-2); }

/* ── Mobile Nav & Toggle ────────────────────── */
.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--color-text);
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  margin-left: auto;
}
.nav-toggle:hover {
  background: var(--color-surface-2);
}

@media (max-width: 768px) {
  .site-nav {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem 1.5rem 1.5rem;
    gap: 0.25rem;
    z-index: 99;
    box-shadow: var(--shadow-lg);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity var(--transition-md), transform var(--transition-md), visibility var(--transition-md);
  }

  .site-nav.is-open { 
    visibility: visible;
    opacity: 1;
    transform: translateY(0); 
    display: flex; 
  }

  .site-nav a { padding: 0.6rem 0; width: 100%; font-size: 1rem; }
}

@media (min-width: 769px) {
  .nav-toggle { display: none !important; }
  .site-nav { display: flex !important; transform: none; position: static; background: none; border: none; padding: 0; box-shadow: none; }
}

/* ── Footer ─────────────────────────────────── */
.site-footer {
  background: var(--color-surface);
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
  padding: clamp(2.5rem, 6vw, 4rem) 0 clamp(1.5rem, 3vw, 2rem);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
}

.footer-brand .site-logo { color: var(--color-primary); }

.footer-brand p {
  color: var(--color-text-muted);
  margin-top: 0.75rem;
  font-size: clamp(0.8rem, 1.5vw, 0.9rem);
  max-width: 300px;
}

.footer-nav h3, .footer-subscribe h3 {
  color: var(--color-text);
  margin-bottom: 1rem;
  font-size: clamp(0.875rem, 1.5vw, 1rem);
}

.footer-nav ul { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }

.footer-nav a {
  color: var(--color-text-muted);
  font-size: clamp(0.8rem, 1.25vw, 0.9rem);
  transition: color var(--transition);
}

.footer-nav a:hover { color: var(--color-primary); }

.footer-legal { 
  display: flex; 
  flex-direction: column; 
  align-items: center; 
  text-align: center;
  gap: 0.75rem; 
  border-top: 1px solid var(--color-border); 
  margin-top: 3rem; 
  padding-top: 2rem;
}
.footer-copyright { font-size: clamp(0.75rem, 1.25vw, 0.85rem); color: var(--color-text-muted); }
.footer-disclaimer { font-size: clamp(0.7rem, 1.25vw, 0.8rem); color: var(--color-text-muted); line-height: 1.5; max-width: 600px; }
.footer-sitemap-link { font-size: clamp(0.75rem, 1.25vw, 0.85rem); color: var(--color-text-muted); text-decoration: underline; transition: color var(--transition); }
.footer-sitemap-link:hover { color: var(--color-primary); }

.social-links a { color: var(--color-text-muted); transition: color var(--transition); display: inline-flex; align-items: center; justify-content: center; }
.social-links a:hover { color: var(--color-primary); }

@media (max-width: 1024px) { .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; } .footer-brand, .footer-subscribe { grid-column: 1 / -1; } }
@media (max-width: 600px)  { .footer-grid { grid-template-columns: 1fr; gap: 1.5rem; } .footer-brand, .footer-subscribe { grid-column: auto; } }

/* ── Desktop Dropdown Menus ─────────────────── */
.nav-dropdown {
  position: relative;
  display: flex;
  align-items: center;
  height: 100%;
}

.nav-submenu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  min-width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 0.5rem;
  display: none;
  flex-direction: column;
  gap: 2px;
  z-index: 200;
}

/* Invisible bridge to prevent hover loss */
.nav-submenu::before {
  content: '';
  position: absolute;
  top: -15px;
  left: 0;
  right: 0;
  height: 15px;
}

.nav-dropdown:hover .nav-submenu,
.nav-dropdown:focus-within .nav-submenu {
  display: flex;
}

.nav-submenu-link {
  color: var(--color-text-body);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
  display: block;
}

.nav-submenu-link:hover {
  background: var(--color-surface-2);
  color: var(--color-primary);
}