/**
 * DeepEcon Universal Header Styles
 * Works across all pages - HTML, Flask templates, and React apps
 */

:root {
  /* DeepEcon v3.0 Design System - Teal Primary */
  --deepecon-primary: #0d9488;
  --deepecon-primary-dark: #0f766e;
  --deepecon-primary-light: #14b8a6;
  --deepecon-text: #111827;
  --deepecon-text-secondary: #4b5563;
  --deepecon-text-light: #6b7280;
  --deepecon-border: #e5e7eb;
  --deepecon-bg-hover: #f0fdfa;
  --deepecon-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --deepecon-header-height: 64px;
}

/* Reset for header */
.deepecon-header * {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* Main Header */
.deepecon-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: white;
  border-bottom: 3px solid var(--deepecon-primary, #0d9488);
  padding: 15px 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
}

.deepecon-header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* Logo */
.deepecon-logo {
  display: flex;
  align-items: center;
  gap: 15px;
  text-decoration: none;
  color: #1a1a1a;
  transition: opacity 0.2s ease;
}

.deepecon-logo:hover {
  opacity: 0.8;
}

.deepecon-logo-image {
  height: 50px;
  width: auto;
  flex-shrink: 0;
}

.deepecon-tagline {
  font-size: 16px;
  color: #1a1a1a;
  font-weight: 600;
  flex: 1;
}

/* Desktop Navigation */
.deepecon-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.deepecon-nav-item {
  position: relative;
}

.deepecon-nav-link {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.625rem 1rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--deepecon-text);
  background: none;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.deepecon-nav-link:hover {
  background: var(--deepecon-bg-hover);
  color: var(--deepecon-primary);
}

.deepecon-dropdown-icon {
  transition: transform 0.2s ease;
  opacity: 0.6;
}

.deepecon-nav-link:hover .deepecon-dropdown-icon {
  opacity: 1;
}

/* User Avatar */
.deepecon-user-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--deepecon-primary);
  color: white;
  font-size: 0.875rem;
  font-weight: 600;
  margin-right: 0.25rem;
}

/* Dropdown Menu */
.deepecon-dropdown-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  min-width: 220px;
  background: white;
  border: 1px solid var(--deepecon-border);
  border-radius: 8px;
  box-shadow: var(--deepecon-shadow);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s ease;
  z-index: 100;
}

.deepecon-dropdown-menu.active {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.deepecon-dropdown-item {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--deepecon-text);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: all 0.15s ease;
  border-bottom: 1px solid var(--deepecon-border);
}

.deepecon-dropdown-item:last-child {
  border-bottom: none;
}

.deepecon-dropdown-item:hover {
  background: var(--deepecon-bg-hover);
  color: var(--deepecon-primary);
  padding-left: 1.25rem;
}

.deepecon-dropdown-item:first-child {
  border-top-left-radius: 7px;
  border-top-right-radius: 7px;
}

.deepecon-dropdown-item:last-child {
  border-bottom-left-radius: 7px;
  border-bottom-right-radius: 7px;
}

/* Submenu */
.deepecon-dropdown-item.has-submenu {
  position: relative;
  cursor: pointer;
}

.deepecon-dropdown-item.has-submenu > span {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.deepecon-submenu {
  position: absolute;
  left: calc(100% + 0.5rem);
  top: -1px;
  min-width: 200px;
  background: white;
  border: 1px solid var(--deepecon-border);
  border-radius: 8px;
  box-shadow: var(--deepecon-shadow);
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
}

.deepecon-dropdown-item.has-submenu:hover .deepecon-submenu {
  opacity: 1;
  visibility: visible;
}

/* Mobile Menu */
.deepecon-mobile-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  color: var(--deepecon-text);
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.2s ease;
}

.deepecon-mobile-toggle:hover {
  background: var(--deepecon-bg-hover);
}

.deepecon-mobile-menu {
  display: none;
  position: fixed;
  top: var(--deepecon-header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: white;
  overflow-y: auto;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

.deepecon-mobile-menu.active {
  transform: translateX(0);
}

.deepecon-mobile-sections {
  padding: 1.5rem;
}

.deepecon-mobile-section {
  margin-bottom: 2rem;
}

.deepecon-mobile-section-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--deepecon-text-light);
  margin-bottom: 0.75rem;
  padding: 0 0.5rem;
}

.deepecon-mobile-link {
  display: block;
  padding: 0.875rem 0.5rem;
  color: var(--deepecon-text);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  border-radius: 6px;
  transition: all 0.2s ease;
}

.deepecon-mobile-link:hover,
.deepecon-mobile-link:active {
  background: var(--deepecon-bg-hover);
  color: var(--deepecon-primary);
  padding-left: 1rem;
}

.deepecon-mobile-subsection {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--deepecon-text);
  padding: 0.75rem 0.5rem 0.5rem;
  margin-top: 0.5rem;
}

.deepecon-mobile-sublink {
  padding-left: 1.5rem;
  font-size: 0.9375rem;
  font-weight: 400;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .deepecon-nav {
    display: none;
  }

  .deepecon-mobile-toggle {
    display: flex;
  }

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

@media (max-width: 768px) {
  .deepecon-header-container {
    padding: 0 1rem;
  }

  .deepecon-logo-text {
    font-size: 1.125rem;
  }

  .deepecon-mobile-sections {
    padding: 1rem;
  }
}

/* Active link highlighting (optional) */
.deepecon-nav-link[data-active="true"],
.deepecon-dropdown-item[data-active="true"],
.deepecon-mobile-link[data-active="true"] {
  color: var(--deepecon-primary);
  font-weight: 600;
}

/* Loading state (optional) */
.deepecon-header.loading {
  opacity: 0.7;
  pointer-events: none;
}

/* Print styles */
@media print {
  .deepecon-header {
    display: none;
  }
}