/**
 * DRD Engineers Header & Navigation Component
 * WPWeb style clean navigation, topbar, multi-level dropdowns, modal overlay
 */

/* Topbar */
.site-topbar {
  background-color: var(--color-primary-container); /* Industrial Orange */
  color: #ffffff;
  padding: 6px 0;
  font-size: 13px;
  font-family: var(--font-mono);
}

.topbar-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topbar-contact {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.topbar-link {
  color: #ffffff;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  transition: opacity var(--transition-fast);
}

.topbar-link:hover {
  color: #ffffff;
  opacity: 0.85;
}

.topbar-socials {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.topbar-socials a {
  color: #ffffff;
  font-weight: 600;
  font-size: 12px;
}

/* Site Header */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background-color: #ffffff; /* Clean white background initially */
  border-bottom: 1px solid var(--color-border-subtle);
  padding: 12px 0;
  transition: all var(--transition-normal);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.site-header.is-scrolled {
  background-color: var(--color-inverse-surface); /* Midnight Carbon on scroll */
  border-bottom-color: rgba(255, 255, 255, 0.1);
  padding: 8px 0;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.header-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
}

.site-logo img,
.site-logo svg {
  height: 46px;
  width: auto;
  transition: height var(--transition-fast);
}

.site-header.is-scrolled .site-logo img {
  height: 40px;
}

/* Primary Navigation Menu */
.primary-nav-wrapper {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.primary-menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
  margin: 0;
  padding: 0;
}

.primary-menu > li {
  position: relative;
}

.primary-menu > li > a {
  color: var(--color-on-surface); /* Dark text on white header */
  font-weight: 600;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: 12px 0;
  display: block;
  transition: color var(--transition-fast);
}

.site-header.is-scrolled .primary-menu > li > a {
  color: #ffffff; /* White text on dark scrolled header */
}

.primary-menu > li:hover > a,
.primary-menu > li.current-menu-item > a {
  color: var(--color-primary-container) !important;
}

/* WPWeb Style Clean Submenu Dropdowns */
.primary-menu .sub-menu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 240px;
  background-color: #ffffff;
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-default);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
  list-style: none;
  padding: 8px 0;
  margin: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-fast);
  z-index: 1002;
}

.primary-menu li:hover > .sub-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Nested 2nd-level Flyout Submenu */
.primary-menu .sub-menu .sub-menu {
  top: 0;
  left: 100%;
  margin-left: 2px;
}

.primary-menu .sub-menu li {
  position: relative;
}

.primary-menu .sub-menu a {
  display: block;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-on-surface) !important;
  text-transform: none;
  letter-spacing: normal;
  border-left: 3px solid transparent;
  transition: all var(--transition-fast);
}

.primary-menu .sub-menu a:hover {
  background-color: var(--color-surface-container-low);
  color: var(--color-primary-container) !important;
  border-left-color: var(--color-primary-container);
  padding-left: 22px;
}

/* Mobile Toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  color: var(--color-on-surface);
}

.site-header.is-scrolled .mobile-menu-toggle {
  color: #ffffff;
}

@media (max-width: 992px) {
  .site-topbar {
    display: none;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .primary-nav-wrapper {
    position: fixed;
    top: 0;
    right: -100%;
    width: 320px;
    height: 100vh;
    background-color: var(--color-inverse-surface);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-12) var(--space-6);
    transition: right var(--transition-normal);
    box-shadow: -5px 0 25px rgba(0, 0, 0, 0.3);
    z-index: 1001;
    overflow-y: auto;
  }

  .primary-nav-wrapper.is-open {
    right: 0;
  }

  .primary-menu {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: 0;
  }

  .primary-menu > li {
    width: 100%;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .primary-menu > li > a {
    color: #ffffff !important;
    font-size: 16px;
    padding: 14px 0;
  }

  .primary-menu .sub-menu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    background-color: rgba(0, 0, 0, 0.2);
    width: 100%;
    border: none;
    padding: 0;
  }

  .primary-menu .sub-menu a {
    color: var(--color-surface-dim) !important;
    padding-left: 24px;
  }
}

/* Modal Popup Overlay CSS */
.drd-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(5px);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.drd-modal-overlay.is-active {
  opacity: 1;
  visibility: visible;
}

.drd-modal-container {
  background-color: #ffffff;
  width: 90%;
  max-width: 680px;
  max-height: 90vh;
  overflow-y: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-subtle);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
  transform: translateY(-20px);
  transition: transform var(--transition-normal);
}

.drd-modal-overlay.is-active .drd-modal-container {
  transform: translateY(0);
}

.drd-modal-header {
  background-color: var(--color-inverse-surface);
  color: #ffffff;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.drd-modal-header .font-mono {
  color: var(--color-primary-container);
  font-size: 13px;
  letter-spacing: 0.05em;
}

.drd-modal-close {
  background: none;
  border: none;
  color: #ffffff;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.drd-modal-close:hover {
  color: var(--color-primary-container);
}

.drd-modal-body {
  padding: 28px;
}