/* ============================================================
   DvSum — Navigation Styles
   ============================================================ */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 72px;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: height var(--transition-base), box-shadow var(--transition-base), background var(--transition-theme);
}
.nav.scrolled {
  height: 56px;
  box-shadow: var(--shadow-sm);
}
.nav__inner {
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--container-px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

/* Logo */
.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
}
.nav__logo-mark {
  width: 32px;
  height: 32px;
}
.nav__logo-text {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
}
.nav__logo-text span { color: var(--dv-orange); }

/* Main links */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
}
.nav__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav__link:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}
.nav__link.active { color: var(--dv-orange); }

/* Dropdown */
.nav__dropdown {
  position: relative;
}
.nav__dropdown-menu {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 240px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}
.nav__dropdown:hover .nav__dropdown-menu,
.nav__dropdown:focus-within .nav__dropdown-menu {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}
.nav__dropdown-item {
  display: block;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}
.nav__dropdown-item:hover { background: var(--bg-surface); }
.nav__dropdown-item-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
  display: block;
}
.nav__dropdown-item-desc {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: 2px;
  display: block;
}
.nav__chevron {
  width: 14px;
  height: 14px;
  transition: transform var(--transition-fast);
}
.nav__dropdown:hover .nav__chevron { transform: rotate(180deg); }

/* Right actions */
.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}
.nav__login {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav__login:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}

/* Theme toggle */
.nav__theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  background: transparent;
  transition: color var(--transition-fast), background var(--transition-fast);
  cursor: pointer;
}
.nav__theme-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}
.icon-sun, .icon-moon { width: 18px; height: 18px; }
[data-theme="light"] .icon-moon { display: none; }
[data-theme="dark"]  .icon-sun  { display: none; }

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

/* Mobile menu */
.nav__mobile {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg-page);
  z-index: 99;
  flex-direction: column;
  padding: 100px var(--container-px) var(--space-8);
  gap: var(--space-2);
  overflow-y: auto;
}
.nav__mobile.open { display: flex; }
.nav__mobile-link {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-primary);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--border-light);
  display: block;
  transition: color var(--transition-fast);
}
.nav__mobile-link:hover { color: var(--dv-orange); }
.nav__mobile-sub {
  padding-left: var(--space-4);
}
.nav__mobile-sub .nav__mobile-link {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--text-secondary);
}
.nav__mobile-actions {
  margin-top: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__login { display: none; }
  .nav__hamburger { display: flex; }
}
@media (max-width: 480px) {
  .btn.btn-primary.nav-cta span { display: none; }
}

/* ── Dropdown open state (JS-toggled) ── */
.nav__item--dropdown { position: relative; }
.nav__dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  min-width: 260px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-2);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity var(--transition-base), transform var(--transition-base);
  z-index: 200;
}
.nav__dropdown.open {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}
.nav__dropdown-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: 10px 12px;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
  text-decoration: none;
}
.nav__dropdown-item:hover { background: var(--bg-surface); }
.nav__dropdown-item strong {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
  display: block;
}
.nav__dropdown-desc {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: 2px;
  display: block;
}
.nav__dropdown-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--text-secondary);
}

/* ── Nav link as button (Solutions) ── */
.nav__link--dropdown {
  background: none;
  border: none;
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav__link--dropdown:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
}
.nav__link--dropdown[aria-expanded="true"] svg {
  transform: rotate(180deg);
}
.nav__link--dropdown svg {
  transition: transform var(--transition-fast);
}

/* ── Mobile close button ── */
.nav__mobile-close {
  position: absolute;
  top: var(--space-5);
  right: var(--space-5);
  width: 40px; height: 40px;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  color: var(--text-primary);
}
.nav__mobile-inner { position: relative; }

/* ── Mobile hamburger → X on open ── */
.nav__mobile.open + * .nav__hamburger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__mobile.open + * .nav__hamburger span:nth-child(2) { opacity: 0; }
.nav__mobile.open + * .nav__hamburger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── btn-full util ── */
.btn--full { width: 100%; justify-content: center; }

/* ── Real logo image handling ── */
.nav__logo-img,
.footer__logo-img {
  display: block;
  transition: opacity var(--transition-fast);
}
.nav__logo-img:hover { opacity: 0.8; }