.black-test-wrapper {
    width: 100%;
    max-width: 1100px;
    margin: 25px auto;
    padding: 0 18px 25px;
}

/* Preview */

.preview-card {
    max-width: 850px;
    margin: 0 auto 28px;
    padding: 15px;
    background: #ffffff;
    border: 1px solid #e2e5e9;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0,0,0,.15);
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.preview-header h2 {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
}

.preview-status {
    font-size: 13px;
    color: #666666;
}

.screen-stage {
    position: relative;
    display: flex;
    width: 100%;
    height: clamp(240px, 38vw, 400px);
    min-height: 220px;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: #000000;
    border-radius: 8px;
    box-shadow: 0 2px 12px rgba(0,0,0,.25);
}

.fullscreen-button {
    position: absolute;
    top: 12px;
    right: 12px;
    z-index: 5;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border: 1px solid #444444;
    border-radius: 7px;
    background: #000000;
    color: #ffffff;
    font-size: 24px;
    cursor: pointer;
}

.fullscreen-button:hover {
    background: #222222;
}

.screen-stage:fullscreen {
    width: 100vw;
    height: 100vh;
    max-height: none;
    min-height: 0;
    padding: 0;
    border: none;
    border-radius: 0;
    background: #000000;
    box-shadow: none;
}

.screen-stage:fullscreen .fullscreen-button {
    opacity: 0;
    transition: opacity .2s;
}

.screen-stage:fullscreen:hover .fullscreen-button {
    opacity: 1;
}

.screen-stage:fullscreen .fullscreen-button:hover {
    opacity: 1;
}

.screen-stage:fullscreen .fullscreen-button {
    cursor: pointer;
}

/* Settings panel */

.settings-panel {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    align-items: end;
    gap: 18px;
    padding: 18px;
    margin-bottom: 18px;
    border: 1px solid #dddddd;
    border-radius: 9px;
    background: #ffffff;
    box-shadow: 0 4px 16px rgba(0,0,0,.15);
}

.setting-label {
    display: block;
    margin-bottom: 8px;
    font-size: 15px;
    font-weight: 700;
}

.form-control,
.form-select {
    min-height: 46px;
    border: 1px solid #d4d4d4;
    border-radius: 7px;
    background-color: #ffffff;
    color: #111111;
}

.form-control:focus,
.form-select:focus {
    border-color: #777777;
    box-shadow: 0 0 0 3px rgba(0,0,0,.08);
}

.download-button {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 46px;
    padding: 10px;
    border: 1px solid #000000;
    border-radius: 7px;
    background: #000000;
    color: #ffffff;
    font-size: 16px;
    font-weight: 700;
    transition: background .2s;
}

.download-button:hover {
    background: #252525;
    color: #ffffff;
}

.download-button:disabled {
    opacity: .6;
}

/* Action buttons */

.action-panel {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 15px;
}

.action-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    min-height: 30px;
    padding: 14px;
    border: 1px solid #dedede;
    border-radius: 9px;
    background: #ffffff;
    color: #111111;
    font-size: 16px;
    font-weight: 700;
    box-shadow: 0 4px 16px rgba(0,0,0,.15);
    cursor: pointer;
    transition: transform .15s, box-shadow .15s;
}

.action-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 7px 18px rgba(0,0,0,.18);
}

.action-button.primary {
    border-color: #000000;
    background: #000000;
    color: #ffffff;
}

.action-button svg {
    width: 22px;
    height: 22px;
    flex-shrink: 0;
}

.help-text {
    margin: 17px 0 0;
    text-align: center;
    color: #666666;
    font-size: 13px;
    line-height: 1.8;
}

kbd {
    padding: 2px 6px;
    border: 1px solid #dddddd;
    border-radius: 4px;
    background: #f4f4f4;
    color: #222222;
    font-family: inherit;
    font-size: 12px;
}

/* Mobile */

@media (max-width: 850px) {
    .settings-panel {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 14px;
    }

    .action-panel {
        grid-template-columns: 1fr;
    }

    .action-button {
        min-height: 58px;
    }
}

@media (max-width: 480px) {
    .black-test-wrapper {
        margin-top: 12px;
        padding: 0 10px 20px;
    }

    .preview-card {
        padding: 10px;
        margin-bottom: 16px;
    }

    .preview-header {
        align-items: flex-start;
        flex-direction: column;
    }

    .screen-stage {
        height: 250px;
        min-height: 200px;
    }

    .settings-panel {
        gap: 12px;
        padding: 12px;
    }

    .setting-label {
        font-size: 13px;
    }

    .form-control,
    .form-select {
        min-height: 43px;
        font-size: 14px;
    }

    .download-button {
        min-height: 43px;
        font-size: 14px;
    }

    .action-button {
        font-size: 15px;
    }
}