/* ==========================================================================
   AiVRIC Vision - Universal Header Component Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   Header Container
   -------------------------------------------------------------------------- */
.vision-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height, 64px);
    background-color: var(--color-bg-elevated);
    border-bottom: 1px solid var(--color-border);
    z-index: var(--z-header, 400);
    display: flex;
    align-items: center;
    padding: 0 var(--spacing-6);
    box-shadow: var(--shadow-sm);
    transition: background-color var(--transition-normal),
                border-color var(--transition-normal),
                box-shadow var(--transition-normal);
}

/* Ensure body has padding for fixed header */
body.has-vision-header {
    padding-top: var(--header-height, 64px);
}

/* --------------------------------------------------------------------------
   Header Layout
   -------------------------------------------------------------------------- */
.vision-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: var(--container-7xl, 80rem);
    margin: 0 auto;
    gap: var(--spacing-4);
}

.vision-header__left {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
    min-width: 0;
    flex: 1;
}

.vision-header__right {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    flex-shrink: 0;
}

.vision-header__actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

@media (max-width: 1024px) {
    .vision-header__actions {
        display: none; /* Hide complex actions on mobile/tablet */
    }
}

/* --------------------------------------------------------------------------
   Logo Section
   -------------------------------------------------------------------------- */
.vision-header__logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    text-decoration: none;
    color: var(--color-text-primary);
    flex-shrink: 0;
    transition: opacity var(--transition-fast);
}

.vision-header__logo:hover {
    opacity: 0.9;
}

.vision-header__logo-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.vision-header__logo-icon svg {
    width: 100%;
    height: auto;
    display: block;
}

.vision-header__logo-text {
    display: flex;
    flex-direction: column;
    line-height: var(--line-height-tight);
}

.vision-header__logo-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
    letter-spacing: var(--letter-spacing-tight);
}

.vision-header__logo-subtitle {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--brand-primary);
    text-transform: uppercase;
    letter-spacing: var(--letter-spacing-wider);
}

/* --------------------------------------------------------------------------
   Breadcrumb Navigation
   -------------------------------------------------------------------------- */
.vision-header__divider {
    width: 1px;
    height: 24px;
    background-color: var(--color-border);
    flex-shrink: 0;
}

.vision-header__breadcrumb {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
    min-width: 0;
    overflow: hidden;
}

.vision-header__breadcrumb-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    white-space: nowrap;
    min-width: 0;
}

.vision-header__breadcrumb-link {
    color: var(--color-text-tertiary);
    text-decoration: none;
    transition: color var(--transition-fast);
    overflow: hidden;
    text-overflow: ellipsis;
}

.vision-header__breadcrumb-link:hover {
    color: var(--brand-primary);
}

.vision-header__breadcrumb-separator {
    color: var(--color-text-muted);
    flex-shrink: 0;
    font-size: var(--font-size-xs);
}

.vision-header__breadcrumb-current {
    color: var(--color-text-primary);
    font-weight: var(--font-weight-medium);
    overflow: hidden;
    text-overflow: ellipsis;
}

/* --------------------------------------------------------------------------
   Notification Toggle & Dropdown
   -------------------------------------------------------------------------- */
.vision-header__notification-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    cursor: pointer;
    position: relative;
    transition: all var(--transition-fast);
}

.vision-header__notification-toggle:hover {
    background-color: var(--color-surface-hover);
    border-color: var(--color-border-dark);
    color: var(--brand-primary);
}

.vision-header__notification-toggle svg {
    width: 20px;
    height: 20px;
}

.vision-header__notification-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 8px;
    height: 8px;
    background-color: var(--color-danger);
    border: 2px solid var(--color-bg-elevated);
    border-radius: var(--radius-full);
}

.vision-header__notification-dropdown {
    position: fixed;
    width: 320px;
    background-color: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-popover, 700);
    display: none;
    flex-direction: column;
    overflow: hidden;
    animation: slideDown var(--transition-fast);
}

.vision-header__notification-dropdown.is-open {
    display: flex;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.vision-header__notification-header {
    padding: var(--spacing-4);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.vision-header__notification-header h3 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    margin: 0;
}

.vision-header__notification-clear {
    font-size: var(--font-size-xs);
    color: var(--brand-primary);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}

.vision-header__notification-list {
    max-height: 360px;
    overflow-y: auto;
}

.vision-header__notification-empty {
    padding: var(--spacing-8) var(--spacing-4);
    text-align: center;
    color: var(--color-text-muted);
}

.vision-header__notification-item {
    padding: var(--spacing-4);
    border-bottom: 1px solid var(--color-border-light);
    display: flex;
    gap: var(--spacing-3);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.vision-header__notification-item:hover {
    background-color: var(--color-surface-hover);
}

.vision-header__notification-item.is-unread {
    background-color: rgba(32, 80, 192, 0.05);
}

.vision-header__notification-icon {
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
}

.vision-header__notification-content {
    flex: 1;
}

.vision-header__notification-title {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-0-5);
}

.vision-header__notification-text {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    line-height: var(--line-height-normal);
}

.vision-header__notification-time {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: var(--spacing-1);
}

.vision-header__notification-footer {
    padding: var(--spacing-3);
    background-color: var(--color-bg-secondary);
    text-align: center;
    border-top: 1px solid var(--color-border);
}

.vision-header__notification-footer a {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
}

.vision-header__notification-footer a:hover {
    color: var(--brand-primary);
}

/* --------------------------------------------------------------------------
   Theme Toggle Button
   -------------------------------------------------------------------------- */
.vision-header__theme-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.vision-header__theme-toggle:hover {
    background-color: var(--color-surface-hover);
    border-color: var(--color-border-dark);
    color: var(--color-text-primary);
}

.vision-header__theme-toggle:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.vision-header__theme-toggle svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* Sun icon (shown in dark mode) */
.vision-header__theme-toggle .icon-sun {
    display: none;
}

/* Moon icon (shown in light mode) */
.vision-header__theme-toggle .icon-moon {
    display: block;
}

/* Dark mode: show sun, hide moon */
.dark .vision-header__theme-toggle .icon-sun {
    display: block;
}

.dark .vision-header__theme-toggle .icon-moon {
    display: none;
}

/* System dark mode preference */
@media (prefers-color-scheme: dark) {
    :root:not(.light) .vision-header__theme-toggle .icon-sun {
        display: block;
    }
    :root:not(.light) .vision-header__theme-toggle .icon-moon {
        display: none;
    }
}

/* --------------------------------------------------------------------------
   Mobile Menu Toggle
   -------------------------------------------------------------------------- */
.vision-header__menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.vision-header__menu-toggle:hover {
    background-color: var(--color-surface-hover);
    border-color: var(--color-border-dark);
    color: var(--color-text-primary);
}

.vision-header__menu-toggle:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.vision-header__menu-toggle svg {
    width: 20px;
    height: 20px;
}

/* Hamburger icon lines */
.vision-header__menu-toggle .icon-menu {
    display: block;
}

.vision-header__menu-toggle .icon-close {
    display: none;
}

.vision-header__menu-toggle[aria-expanded="true"] .icon-menu {
    display: none;
}

.vision-header__menu-toggle[aria-expanded="true"] .icon-close {
    display: block;
}

/* --------------------------------------------------------------------------
   Home Link Button
   -------------------------------------------------------------------------- */
.vision-header__home-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.vision-header__home-link:hover {
    background-color: var(--color-surface-hover);
    border-color: var(--color-border-dark);
    color: var(--brand-primary);
}

.vision-header__home-link:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.vision-header__home-link svg {
    width: 20px;
    height: 20px;
}

/* --------------------------------------------------------------------------
   Mobile Navigation Overlay
   -------------------------------------------------------------------------- */
.vision-header__mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height, 64px);
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg-elevated);
    z-index: calc(var(--z-header, 400) - 1);
    overflow-y: auto;
    padding: var(--spacing-4);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.vision-header__mobile-nav.is-open {
    opacity: 1;
    visibility: visible;
}

.vision-header__mobile-nav-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.vision-header__mobile-nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-lg);
    transition: background-color var(--transition-fast);
}

.vision-header__mobile-nav-link:hover {
    background-color: var(--color-surface-hover);
    color: var(--brand-primary);
}

/* --------------------------------------------------------------------------
   Responsive Styles
   -------------------------------------------------------------------------- */

/* Tablet and below */
@media (max-width: 768px) {
    .vision-header {
        height: var(--header-height-mobile, 56px);
        padding: 0 var(--spacing-4);
    }

    body.has-vision-header {
        padding-top: var(--header-height-mobile, 56px);
    }

    .vision-header__logo-text {
        display: none;
    }

    .vision-header__logo-icon {
        width: 36px;
        height: 36px;
    }

    .vision-header__divider {
        display: none;
    }

    .vision-header__breadcrumb {
        flex: 1;
        justify-content: center;
    }

    .vision-header__menu-toggle {
        display: flex;
    }

    .vision-header__mobile-nav {
        display: block;
        top: var(--header-height-mobile, 56px);
    }

    .vision-header__theme-toggle,
    .vision-header__home-link {
        width: 36px;
        height: 36px;
    }

    .vision-header__theme-toggle svg,
    .vision-header__home-link svg {
        width: 18px;
        height: 18px;
    }
}

/* Mobile */
@media (max-width: 480px) {
    .vision-header {
        padding: 0 var(--spacing-3);
    }

    .vision-header__breadcrumb {
        font-size: var(--font-size-xs);
    }

    .vision-header__right {
        gap: var(--spacing-2);
    }
}

/* --------------------------------------------------------------------------
   Print Styles
   -------------------------------------------------------------------------- */
@media print {
    .vision-header {
        position: static;
        box-shadow: none;
        border-bottom: 1px solid #ccc;
    }

    body.has-vision-header {
        padding-top: 0;
    }

    .vision-header__theme-toggle,
    .vision-header__menu-toggle,
    .vision-header__home-link {
        display: none;
    }
}

/* --------------------------------------------------------------------------
   Accessibility
   -------------------------------------------------------------------------- */

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
    .vision-header,
    .vision-header *,
    .vision-header *::before,
    .vision-header *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}

/* High contrast mode support */
@media (forced-colors: active) {
    .vision-header {
        border-bottom: 2px solid CanvasText;
    }

    .vision-header__theme-toggle,
    .vision-header__menu-toggle,
    .vision-header__home-link {
        border: 2px solid ButtonText;
    }
}