:root {
        --smmpanelbdlab-white: #fff;
        --smmpanelbdlab-black: #181632;
        --smmpanelbdlab-gray-50: #F8FAFC;
        --smmpanelbdlab-gray-100: #F3F4F6;
        --smmpanelbdlab-gray-200: #E7ECF3;
        --smmpanelbdlab-gray-400: #546378;
        --smmpanelbdlab-primary: #5078FA;
        --smmpanelbdlab-primary-dark: #3B62E8;
        --smmpanelbdlab-primary-light: #ECF2FF;
        --spinner-border: #f3f3f3;
    }

    *, *::before, *::after {
        box-sizing: border-box;
    }

    body, html {
        width: 100%;
        height: 100%;
        margin: 0;
        padding: 0;
        font-size: 14px;
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    }

    body {
        display: flex;
        flex-direction: column;
        overflow: hidden;
    }

    .transform-duration {
        transition-duration: 0.5s;
    }

    .smmpanelbdlab-theme-change-loader {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: 10000;
        background: rgba(255, 255, 255, 0.8);
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .smmpanelbdlab-theme-change-spinner {
        border: 2px solid var(--spinner-border);
        border-top: 2px solid var(--smmpanelbdlab-primary);
        border-bottom: 2px solid var(--smmpanelbdlab-primary);
        border-radius: 50%;
        width: 48px;
        height: 48px;
        animation: spin 1s linear infinite;
    }

    @keyframes spin {
        0% { transform: rotate(0deg); }
        100% { transform: rotate(360deg); }
    }

    .smmpanelbdlab-theme-change-navbar {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 72px;
        background: var(--smmpanelbdlab-white);
        border-bottom: 1px solid var(--smmpanelbdlab-gray-200);
        flex-shrink: 0;
        position: relative;
        z-index: 999999 !important;
        padding: 0;
        overflow: visible !important;
    }

    .smmpanelbdlab-theme-change-brand {
        display: flex;
        align-items: center;
        gap: 10px;
        padding: 0 20px;
        font-size: 16px;
        font-weight: 700;
        color: var(--smmpanelbdlab-black);
        text-decoration: none;
        white-space: nowrap;
        flex-shrink: 0;
    }

    .smmpanelbdlab-theme-change-brand img {
        max-height: 36px;
    }

    .smmpanelbdlab-theme-change-switcher {
        display: flex;
        align-items: center;
        margin: 0 auto;
        padding: 0 4px;
        gap: 4px;
        flex-shrink: 0;
    }

    .smmpanelbdlab-theme-change-switcher__type {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        cursor: pointer;
        color: var(--smmpanelbdlab-gray-400);
        transition: color 0.2s, background 0.2s;
        border-radius: 6px;
    }

    .smmpanelbdlab-theme-change-switcher__type:hover {
        background: var(--smmpanelbdlab-gray-100);
    }

    .smmpanelbdlab-theme-change-switcher__type.active {
        color: var(--smmpanelbdlab-primary);
        background: var(--smmpanelbdlab-primary-light);
    }

    .smmpanelbdlab-theme-change-dropdowns {
        display: flex;
        align-items: stretch;
        flex-shrink: 0;
        overflow: visible !important;
    }

    .smmpanelbdlab-theme-change-section {
        display: flex;
        align-items: stretch;
        position: relative;
        border-left: 1px solid var(--smmpanelbdlab-gray-200);
        flex-shrink: 0;
        overflow: visible !important;
    }

    .smmpanelbdlab-theme-change-dropdown {
        display: flex;
        flex-direction: column;
        justify-content: center;
        height: 100%;
        padding: 10px 40px 10px 16px;
        cursor: pointer;
        position: relative;
        width: 175px;
    }

    .smmpanelbdlab-theme-change-dropdown__description {
        font-size: 11px;
        color: var(--smmpanelbdlab-gray-400);
        text-transform: uppercase;
        font-weight: 600;
        margin-bottom: 2px;
    }

    .smmpanelbdlab-theme-change-dropdown__item {
        font-size: 15px;
        color: var(--smmpanelbdlab-black);
        font-weight: 500;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .smmpanelbdlab-theme-change-dropdown__chevron {
        position: absolute;
        right: 14px;
        top: 50%;
        transform: translateY(-50%);
        transition: transform 0.2s;
        pointer-events: none;
    }

    .smmpanelbdlab-theme-change-dropdown:hover .smmpanelbdlab-theme-change-dropdown__chevron {
        transform: translateY(-50%) rotate(180deg);
    }

    .smmpanelbdlab-theme-change-dropdown__list {
        position: absolute;
        top: 100%;
        left: -1px;
        min-width: 100%;
        background: var(--smmpanelbdlab-white);
        border: 1px solid var(--smmpanelbdlab-gray-200);
        list-style: none;
        padding: 6px;
        margin: 0;
        visibility: hidden;
        opacity: 0;
        transform: translateY(-6px);
        transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
        z-index: 2147483647 !important;
        max-height: 280px;
        overflow-y: auto;
        box-shadow: 0 12px 35px rgba(0,0,0,0.18);
    }

    .smmpanelbdlab-theme-change-dropdown:hover .smmpanelbdlab-theme-change-dropdown__list {
        visibility: visible;
        opacity: 1;
        transform: translateY(0);
    }

    .smmpanelbdlab-theme-change-dropdown__list li {
        margin-bottom: 4px;
    }

    .smmpanelbdlab-theme-change-dropdown__list li a {
        display: block;
        padding: 8px 12px;
        color: var(--smmpanelbdlab-gray-400);
        text-decoration: none;
        font-size: 14px;
        border-radius: 4px;
        transition: background 0.15s;
        white-space: nowrap;
    }

    .smmpanelbdlab-theme-change-dropdown__list li a:hover {
        background: var(--smmpanelbdlab-gray-100);
        color: var(--smmpanelbdlab-black);
    }

    .smmpanelbdlab-theme-change-dropdown__list li.active a {
        color: var(--smmpanelbdlab-primary);
        background: var(--smmpanelbdlab-primary-light);
    }

    .smmpanelbdlab-theme-change-actions {
        display: flex;
        align-items: center;
        height: 72px;
        padding: 0 20px;
        border-left: 1px solid var(--smmpanelbdlab-gray-200);
        flex-shrink: 0;
    }

    .smmpanelbdlab-theme-change-btn {
        display: inline-flex;
        align-items: center;
        background: var(--smmpanelbdlab-primary);
        color: var(--smmpanelbdlab-white);
        padding: 9px 20px;
        text-decoration: none;
        font-size: 14px;
        font-weight: 600;
        border-radius: 6px;
        transition: background 0.2s;
        white-space: nowrap;
    }

    .smmpanelbdlab-theme-change-btn:hover {
        background: var(--smmpanelbdlab-primary-dark);
        color: var(--smmpanelbdlab-white);
        text-decoration: none;
    }

    .smmpanelbdlab-theme-change-iframe-area {
        flex: 1;
        position: relative;
        overflow: hidden;
        display: flex;
        justify-content: center;
        align-items: center;
    }

    #smmpanelbdlab-theme-change-iframe-control {
        width: 100%;
        height: 100%;
        position: absolute;
        top: 0;
        left: 0;
        border: none;
    }

    .smmpanelbdlab-theme-change-mobile-mockup {
        background-color: var(--smmpanelbdlab-gray-50);
        width: 100%;
        height: 100%;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .smmpanelbdlab-theme-change-mobile-mockup .smmpanelbdlab-theme-change-iframe-wrap {
        width: 375px;
        height: 100%;
        overflow: hidden;
        background-color: var(--smmpanelbdlab-white);
        border-left: 1px solid var(--smmpanelbdlab-gray-200);
        border-right: 1px solid var(--smmpanelbdlab-gray-200);
        box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    }

    @media (max-width: 900px) {
        .smmpanelbdlab-theme-change-navbar {
            height: auto;
            flex-wrap: wrap;
        }
        
        .smmpanelbdlab-theme-change-navbar > .smmpanelbdlab-theme-change-brand {
            height: 60px;
            flex: 1;
            padding: 0 15px;
            order: 1;
        }
        
        .smmpanelbdlab-theme-change-actions {
            height: 60px;
            border-left: none;
            padding: 0 15px;
            order: 2;
            flex-shrink: 0;
        }
        
        .smmpanelbdlab-theme-change-switcher {
            display: none !important;
        }
        
        .smmpanelbdlab-theme-change-dropdowns {
            width: 100%;
            border-top: 1px solid var(--smmpanelbdlab-gray-200);
            display: flex;
            height: 60px;
            order: 3;
        }
        
        .smmpanelbdlab-theme-change-section {
            flex: 1;
            border-left: 1px solid var(--smmpanelbdlab-gray-200);
        }
        
        .smmpanelbdlab-theme-change-section:first-child {
            border-left: none;
        }
        
        .smmpanelbdlab-theme-change-section:only-child {
            width: 100% !important;
            flex: none !important;
        }
        
        .smmpanelbdlab-theme-change-dropdown {
            width: 100%;
            height: 60px;
            padding: 8px 30px 8px 12px;
        }
        
        .smmpanelbdlab-theme-change-dropdown__item {
            font-size: 14px;
        }
        
        .smmpanelbdlab-theme-change-brand {
            min-width: 0;
        }
        
        .smmpanelbdlab-theme-change-brand img {
            max-height: 32px;
        }
        
        .smmpanelbdlab-theme-change-btn {
            padding: 7px 14px;
            font-size: 13px;
        }
    }

    @media (max-width: 480px) {
        .smmpanelbdlab-theme-change-brand {
            padding: 0 10px;
        }
        .smmpanelbdlab-theme-change-brand img {
            max-height: 28px;
        }
        .smmpanelbdlab-theme-change-actions {
            padding: 0 10px;
        }
        .smmpanelbdlab-theme-change-btn {
            padding: 6px 12px;
            font-size: 12px;
        }
    }

    #smmpanelbdlab-style-dropdown-sec .smmpanelbdlab-theme-change-dropdown {
        width: 150px;
    }