.bkbg-cm-app {
    font-family: system-ui, -apple-system, sans-serif;
    box-sizing: border-box;
}

.bkbg-cm-wrap {
    border-radius: 12px;
    padding: 28px;
    margin: 0 auto;
}

.bkbg-cm-title {
    font-size: var(--bkbg-cm-tt-font-size-d, 26px);
    line-height: var(--bkbg-cm-tt-line-height-d, 1.2);
    font-family: var(--bkbg-cm-tt-font-family, inherit);
    font-weight: var(--bkbg-cm-tt-font-weight, 700);
    font-style: var(--bkbg-cm-tt-font-style, normal);
    text-transform: var(--bkbg-cm-tt-text-transform, none);
    text-decoration: var(--bkbg-cm-tt-text-decoration, none);
    letter-spacing: var(--bkbg-cm-tt-letter-spacing-d, normal);
    word-spacing: var(--bkbg-cm-tt-word-spacing-d, normal);
    margin: 0 0 6px;
}

.bkbg-cm-subtitle {
    font-size: var(--bkbg-cm-st-font-size-d, 15px);
    line-height: var(--bkbg-cm-st-line-height-d, 1.5);
    font-family: var(--bkbg-cm-st-font-family, inherit);
    font-weight: var(--bkbg-cm-st-font-weight, 400);
    font-style: var(--bkbg-cm-st-font-style, normal);
    text-transform: var(--bkbg-cm-st-text-transform, none);
    text-decoration: var(--bkbg-cm-st-text-decoration, none);
    letter-spacing: var(--bkbg-cm-st-letter-spacing-d, normal);
    word-spacing: var(--bkbg-cm-st-word-spacing-d, normal);
    margin: 0 0 22px;
}

.bkbg-cm-card {
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 16px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

/* Picker row */
.bkbg-cm-pickers {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 16px;
    align-items: center;
}

.bkbg-cm-picker-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.bkbg-cm-swatch {
    width: 100%;
    height: 80px;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
    border: none;
    cursor: pointer;
    transition: transform 0.15s;
    padding: 0;
    overflow: hidden;
    position: relative;
}

.bkbg-cm-swatch:hover { transform: scale(1.03); }

.bkbg-cm-swatch input[type="color"] {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.bkbg-cm-swatch-label {
    font-size: 12px;
    font-weight: 600;
    opacity: 0.7;
}

.bkbg-cm-plus {
    font-size: 24px;
    font-weight: 700;
    opacity: 0.5;
    text-align: center;
}

/* Ratio slider */
.bkbg-cm-ratio-row {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    margin-bottom: 8px;
}

.bkbg-cm-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    appearance: none;
    -webkit-appearance: none;
    outline: none;
    margin-bottom: 16px;
    cursor: pointer;
}

.bkbg-cm-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #fff;
    border: 3px solid currentColor;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    cursor: pointer;
    transition: transform 0.15s;
}

.bkbg-cm-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }
.bkbg-cm-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #fff;
    border: 3px solid currentColor;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    cursor: pointer;
}

/* Result swatch */
.bkbg-cm-result-swatch {
    width: 100%;
    height: 72px;
    border-radius: 10px;
    margin-bottom: 14px;
    box-shadow: 0 2px 12px rgba(0,0,0,0.12);
    transition: background-color 0.15s;
}

/* Formats */
.bkbg-cm-formats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    margin-top: 8px;
}

.bkbg-cm-format-box {
    background: #f9fafb;
    border-radius: 8px;
    padding: 10px 12px;
    text-align: center;
    cursor: pointer;
    transition: background 0.15s;
    border: 1px solid #e5e7eb;
}

.bkbg-cm-format-box:hover { background: #f3f4f6; }
.bkbg-cm-format-box:active { background: #e5e7eb; }

.bkbg-cm-format-val {
    font-family: monospace;
    font-size: 13px;
    font-weight: 700;
    word-break: break-all;
}

.bkbg-cm-format-lbl {
    font-size: 11px;
    opacity: 0.6;
    margin-top: 3px;
}

.bkbg-cm-copied-hint {
    text-align: center;
    font-size: 12px;
    margin-top: 6px;
    height: 18px;
    transition: opacity 0.3s;
    opacity: 0;
}
.bkbg-cm-copied-hint.bkbg-cm-show { opacity: 1; }

/* Gradient */
.bkbg-cm-gradient-bar {
    height: 32px;
    border-radius: 8px;
    margin-top: 10px;
    transition: background 0.2s;
}

/* Harmonies */
.bkbg-cm-harmonies-title {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 12px;
}

.bkbg-cm-harmony-group {
    margin-bottom: 14px;
}

.bkbg-cm-harmony-label {
    font-size: 12px;
    font-weight: 600;
    opacity: 0.7;
    margin-bottom: 6px;
}

.bkbg-cm-harmony-swatches {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.bkbg-cm-harmony-swatch {
    width: 48px;
    height: 48px;
    border-radius: 8px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.10);
    cursor: pointer;
    position: relative;
    transition: transform 0.15s;
    border: none;
}

.bkbg-cm-harmony-swatch:hover { transform: scale(1.1); }

.bkbg-cm-harmony-hex {
    font-size: 10px;
    text-align: center;
    margin-top: 3px;
    font-family: monospace;
    opacity: 0.75;
}

@media (max-width: 1024px) {
    .bkbg-cm-title {
        font-size: var(--bkbg-cm-tt-font-size-t, var(--bkbg-cm-tt-font-size-d, 26px));
        line-height: var(--bkbg-cm-tt-line-height-t, var(--bkbg-cm-tt-line-height-d, 1.2));
        letter-spacing: var(--bkbg-cm-tt-letter-spacing-t, var(--bkbg-cm-tt-letter-spacing-d, normal));
        word-spacing: var(--bkbg-cm-tt-word-spacing-t, var(--bkbg-cm-tt-word-spacing-d, normal));
    }
    .bkbg-cm-subtitle {
        font-size: var(--bkbg-cm-st-font-size-t, var(--bkbg-cm-st-font-size-d, 15px));
        line-height: var(--bkbg-cm-st-line-height-t, var(--bkbg-cm-st-line-height-d, 1.5));
        letter-spacing: var(--bkbg-cm-st-letter-spacing-t, var(--bkbg-cm-st-letter-spacing-d, normal));
        word-spacing: var(--bkbg-cm-st-word-spacing-t, var(--bkbg-cm-st-word-spacing-d, normal));
    }
}

@media (max-width: 767px) {
    .bkbg-cm-title {
        font-size: var(--bkbg-cm-tt-font-size-m, var(--bkbg-cm-tt-font-size-t, var(--bkbg-cm-tt-font-size-d, 26px)));
        line-height: var(--bkbg-cm-tt-line-height-m, var(--bkbg-cm-tt-line-height-t, var(--bkbg-cm-tt-line-height-d, 1.2)));
        letter-spacing: var(--bkbg-cm-tt-letter-spacing-m, var(--bkbg-cm-tt-letter-spacing-t, var(--bkbg-cm-tt-letter-spacing-d, normal)));
        word-spacing: var(--bkbg-cm-tt-word-spacing-m, var(--bkbg-cm-tt-word-spacing-t, var(--bkbg-cm-tt-word-spacing-d, normal)));
    }
    .bkbg-cm-subtitle {
        font-size: var(--bkbg-cm-st-font-size-m, var(--bkbg-cm-st-font-size-t, var(--bkbg-cm-st-font-size-d, 15px)));
        line-height: var(--bkbg-cm-st-line-height-m, var(--bkbg-cm-st-line-height-t, var(--bkbg-cm-st-line-height-d, 1.5)));
        letter-spacing: var(--bkbg-cm-st-letter-spacing-m, var(--bkbg-cm-st-letter-spacing-t, var(--bkbg-cm-st-letter-spacing-d, normal)));
        word-spacing: var(--bkbg-cm-st-word-spacing-m, var(--bkbg-cm-st-word-spacing-t, var(--bkbg-cm-st-word-spacing-d, normal)));
    }
}

@media (max-width: 480px) {
    .bkbg-cm-wrap { padding: 16px; }
    .bkbg-cm-formats { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 360px) {
    .bkbg-cm-pickers { grid-template-columns: 1fr; }
    .bkbg-cm-plus { display: none; }
}