/**
 * Header Component - Admin Interface
 *
 * Top header bar with page title, search, notifications, and user menu.
 * Sticky positioning with backdrop blur for modern look.
 */

@layer components {
    /**
     * Header Container
     */
    .admin-header {
        display: flex;
        align-items: center;
        gap: var(--spacing-sm);
        background-color: var(--header-bg);
        border-bottom: 1px solid var(--header-border);
        padding: var(--spacing-sm) var(--spacing-content-padding);
        min-height: var(--header-height-mobile);

        /* Sticky with blur effect */
        position: sticky;
        top: 0;
        z-index: var(--z-header);
        backdrop-filter: blur(8px);
        background-color: var(--header-bg);

        @media (min-width: 768px) {
            min-height: var(--header-height-tablet);
        }

        @media (min-width: 1440px) {
            min-height: var(--header-height-wide);
        }
    }

    /**
     * Page Title
     */
    .admin-header__title {
        font-size: var(--font-size-lg);
        font-weight: 600;
        color: var(--header-text);
        margin: 0;
        flex: 1;
        min-width: 0;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;

        @media (max-width: 767px) {
            /* Hide on mobile, show breadcrumbs instead */
            display: none;
        }
    }

    /**
     * Search Bar Container
     */
    .admin-header__search {
        flex: 0 1 400px;
        max-width: 400px;

        @media (max-width: 767px) {
            /* Full width on mobile */
            flex: 1;
            max-width: none;
        }
    }

    /**
     * Header Actions (Right Side)
     */
    .admin-header__actions {
        display: flex;
        align-items: center;
        gap: var(--spacing-sm);
        margin-left: auto;
    }

    /**
     * Action Button (Icon Button)
     */
    .admin-action-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 36px;
        height: 36px;
        border-radius: var(--radius-md);
        background-color: transparent;
        border: 1px solid transparent;
        color: var(--header-text);
        cursor: pointer;
        transition: all var(--transition-base);
        position: relative;

        &:hover {
            background-color: var(--hover-overlay);
            border-color: var(--border-light);
        }

        &:focus-visible {
            outline: 2px solid var(--focus-ring);
            outline-offset: 2px;
        }

        /* Dark Theme Optimization */
        @media (prefers-color-scheme: dark) {
            &:hover {
                background-color: oklch(from var(--header-bg) calc(l + 0.03) c h);
            }
        }
    }

    .admin-action-btn__icon {
        width: 18px;
        height: 18px;
    }

    /**
     * Notification Badge
     */
    .admin-action-btn__badge {
        position: absolute;
        top: 6px;
        right: 6px;
        width: 8px;
        height: 8px;
        background-color: var(--accent-error);
        border: 2px solid var(--header-bg);
        border-radius: 50%;
    }

    .admin-action-btn__badge--count {
        width: auto;
        height: auto;
        min-width: 18px;
        padding: 2px 5px;
        font-size: 10px;
        font-weight: 600;
        color: white;
        line-height: 1;
        border-radius: 9px;
    }

    /**
     * Theme Toggle Button
     */
    .admin-theme-toggle {
        display: flex;
        align-items: center;
        gap: var(--spacing-xs);
        padding: var(--spacing-xs) var(--spacing-sm);
        background-color: var(--bg-secondary);
        border: 1px solid var(--border-light);
        border-radius: var(--radius-md);
        cursor: pointer;
        transition: all var(--transition-base);

        &:hover {
            background-color: var(--bg-tertiary);
        }

        /* Dark Theme Optimization */
        @media (prefers-color-scheme: dark) {
            &:hover {
                background-color: oklch(from var(--bg-secondary) calc(l + 0.05) c h);
            }
        }

        @media (max-width: 767px) {
            /* Icon only on mobile */
            padding: var(--spacing-xs);

            .admin-theme-toggle__label {
                display: none;
            }
        }
    }

    .admin-theme-toggle__icon {
        width: 18px;
        height: 18px;
        color: var(--header-text);
    }

    .admin-theme-toggle__label {
        font-size: var(--font-size-sm);
        color: var(--header-text);
    }

    /**
     * User Menu Dropdown
     */
    .admin-user-menu {
        position: relative;
    }

    .admin-user-menu__trigger {
        display: flex;
        align-items: center;
        gap: var(--spacing-sm);
        padding: var(--spacing-xs);
        background-color: transparent;
        border: 1px solid transparent;
        border-radius: var(--radius-md);
        cursor: pointer;
        transition: all var(--transition-base);

        &:hover {
            background-color: var(--hover-overlay);
            border-color: var(--border-light);
        }

        &:focus-visible {
            outline: 2px solid var(--focus-ring);
            outline-offset: 2px;
        }

        /* Dark Theme Optimization */
        @media (prefers-color-scheme: dark) {
            &:hover {
                background-color: oklch(from var(--header-bg) calc(l + 0.03) c h);
            }
        }
    }

    .admin-user-menu__avatar {
        width: 32px;
        height: 32px;
        border-radius: 50%;
        object-fit: cover;
        border: 2px solid var(--border-light);
    }

    .admin-user-menu__name {
        font-size: var(--font-size-sm);
        font-weight: 500;
        color: var(--header-text);

        @media (max-width: 767px) {
            display: none;
        }
    }

    .admin-user-menu__chevron {
        width: 16px;
        height: 16px;
        color: var(--header-text);
        transition: transform var(--transition-base);

        /* Rotate when popover is open (handled by JavaScript) */
        @media (max-width: 767px) {
            display: none;
        }
    }

    .admin-user-menu__item {
        list-style: none;
        margin: 0;
    }

    .admin-user-menu__link {
        display: flex;
        align-items: center;
        gap: var(--spacing-sm);
        padding: var(--spacing-sm) var(--spacing-md);
        color: var(--content-text);
        text-decoration: none;
        font-size: var(--font-size-sm);
        transition: background-color var(--transition-base);

        &:hover {
            background-color: var(--bg-secondary);
        }
    }

    .admin-user-menu__icon {
        width: 18px;
        height: 18px;
        opacity: 0.7;
    }

    .admin-user-menu__divider {
        height: 1px;
        background-color: var(--border-light);
        margin: var(--spacing-sm) 0;
    }
}