/* ===================================
   Header & Navigation
   =================================== */

.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-h);
  display: flex; align-items: center;
  transition: box-shadow var(--transition);
}
.site-header.scrolled { box-shadow: 0 2px 16px rgba(0,0,0,.08); }

.header-inner {
  display: flex; align-items: center;
  justify-content: space-between;
  gap: 32px; width: 100%;
}

/* Logo */
.site-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1rem; font-weight: 700; color: var(--color-navy);
  flex-shrink: 0;
}
.site-logo .logo-mark {
  width: 32px; height: 32px;
  background: var(--color-navy);
  border-radius: 6px;
  display: flex; align-items: center; justify-content: center;
}
.site-logo .logo-mark span {
  color: var(--color-accent); font-size: 1rem; font-weight: 800;
}

/* Nav */
.site-nav { display: flex; align-items: center; gap: 4px; flex: 1; justify-content: center; }
.site-nav a {
  padding: 6px 12px;
  font-size: 0.875rem; font-weight: 500; color: var(--color-muted);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.site-nav a:hover, .site-nav a.active { color: var(--color-navy); background: var(--color-bg); }

/* Has-Dropdown */
.nav-dropdown { position: relative; }
.nav-dropdown > a { display: flex; align-items: center; gap: 4px; }
.nav-dropdown > a::after {
  content: '';
  width: 12px; height: 12px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%236B7280'%3E%3Cpath fill-rule='evenodd' d='M5.23 7.21a.75.75 0 011.06.02L10 11.168l3.71-3.938a.75.75 0 111.08 1.04l-4.25 4.5a.75.75 0 01-1.08 0l-4.25-4.5a.75.75 0 01.02-1.06z'/%3E%3C/svg%3E") center/contain no-repeat;
  transition: transform var(--transition);
}
.nav-dropdown:hover > a::after { transform: rotate(180deg); }
.nav-dropdown-menu {
  position: absolute; top: calc(100% + 8px); left: 50%;
  transform: translateX(-50%);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 8px;
  min-width: 220px;
  display: none;
  z-index: 200;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu { display: grid; grid-template-columns: 1fr 1fr; gap: 2px; }
.nav-dropdown-menu a {
  padding: 7px 10px; font-size: 0.8125rem; color: var(--color-text);
  border-radius: var(--radius-sm);
  display: block; white-space: nowrap;
}
.nav-dropdown-menu a:hover { background: var(--color-bg); color: var(--color-navy); }

/* Header Actions */
.header-actions { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.header-actions .btn-tools {
  background: var(--color-navy); color: var(--color-white);
  padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 0.8125rem; font-weight: 600;
  transition: background var(--transition);
}
.header-actions .btn-tools:hover { background: var(--color-blue); }

/* Hamburger */
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  padding: 8px; cursor: pointer;
}
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--color-navy); border-radius: 2px;
  transition: all var(--transition);
}

/* Mobile Drawer */
.mobile-nav {
  position: fixed; top: 0; right: -100%;
  width: min(320px, 90vw); height: 100vh;
  background: var(--color-white);
  box-shadow: -4px 0 32px rgba(0,0,0,.12);
  z-index: 300;
  transition: right 0.3s ease;
  display: flex; flex-direction: column;
  overflow-y: auto;
}
.mobile-nav.open { right: 0; }
.mobile-nav-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--color-border);
}
.mobile-nav-close {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-muted); font-size: 1.25rem;
  transition: background var(--transition);
}
.mobile-nav-close:hover { background: var(--color-bg); }
.mobile-nav-body { padding: 16px 20px; flex: 1; }
.mobile-nav-section { margin-bottom: 24px; }
.mobile-nav-section-label {
  font-size: 0.6875rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--color-muted); margin-bottom: 8px;
}
.mobile-nav-links { display: flex; flex-direction: column; gap: 2px; }
.mobile-nav-links a {
  padding: 9px 12px; border-radius: var(--radius-sm);
  font-size: 0.9rem; color: var(--color-text);
  transition: background var(--transition);
}
.mobile-nav-links a:hover { background: var(--color-bg); color: var(--color-navy); }
.mobile-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,.4);
  z-index: 299;
  display: none;
  backdrop-filter: blur(2px);
}
.mobile-overlay.show { display: block; }

@media (max-width: 840px) {
  .site-nav { display: none; }
  .hamburger { display: flex; }
  .header-actions .btn-tools { display: none; }
}
@media (max-width: 480px) {
  .site-logo .logo-text { display: none; }
}