/* Panel: mobile-first */
.cmyk-rgb-panel {
    --cmyk-accent: #0d6efd;
    --cmyk-bg: #f8fafc;
    --cmyk-border: #e2e8f0;
    --cmyk-text: #1e293b;
    --cmyk-muted: #64748b;
    background: var(--cmyk-bg);
    border-radius: 16px;
    padding: 1.25rem;
    border: 1px solid var(--cmyk-border);
    margin-bottom: 2rem;
}

@media (min-width: 768px) {
    .cmyk-rgb-panel {
        padding: 1.75rem;
    }
}

/* Channels (sliders) */
.cmyk-rgb-inputs {
    display: grid;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.cmyk-rgb-channel {
    display: grid;
    gap: 0.25rem;
}

.cmyk-rgb-channel-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--cmyk-text);
}

.cmyk-rgb-channel-value {
    font-variant-numeric: tabular-nums;
    color: var(--cmyk-muted);
}

.cmyk-rgb-slider {
    width: 100%;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--cmyk-border);
    border-radius: 4px;
    outline: none;
}

.cmyk-rgb-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--cmyk-accent);
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    border: 2px solid #fff;
}

.cmyk-rgb-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--cmyk-accent);
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
    border: 2px solid #fff;
}

.cmyk-rgb-channel[data-channel="c"] .cmyk-rgb-slider::-webkit-slider-runnable-track { background: linear-gradient(to right, #00b4d8, #e0f7fa); }
.cmyk-rgb-channel[data-channel="m"] .cmyk-rgb-slider::-webkit-slider-runnable-track { background: linear-gradient(to right, #d946ef, #fae8ff); }
.cmyk-rgb-channel[data-channel="y"] .cmyk-rgb-slider::-webkit-slider-runnable-track { background: linear-gradient(to right, #eab308, #fef9c3); }
.cmyk-rgb-channel[data-channel="k"] .cmyk-rgb-slider::-webkit-slider-runnable-track { background: linear-gradient(to right, #1e293b, #f1f5f9); }

.cmyk-rgb-channel[data-channel="c"] .cmyk-rgb-slider { background: linear-gradient(to right, #00b4d8, #e0f7fa); }
.cmyk-rgb-channel[data-channel="m"] .cmyk-rgb-slider { background: linear-gradient(to right, #d946ef, #fae8ff); }
.cmyk-rgb-channel[data-channel="y"] .cmyk-rgb-slider { background: linear-gradient(to right, #eab308, #fef9c3); }
.cmyk-rgb-channel[data-channel="k"] .cmyk-rgb-slider { background: linear-gradient(to right, #1e293b, #f1f5f9); }

/* Number inputs */
.cmyk-rgb-numbers {
    margin-bottom: 1.25rem;
}

.cmyk-rgb-numbers-label {
    display: block;
    font-size: 0.8125rem;
    color: var(--cmyk-muted);
    margin-bottom: 0.5rem;
}

.cmyk-rgb-number-inputs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.cmyk-rgb-num {
    width: 100%;
    padding: 0.5rem;
    font-size: 0.9375rem;
    text-align: center;
    border: 1px solid var(--cmyk-border);
    border-radius: 8px;
    background: #fff;
    color: var(--cmyk-text);
}

.cmyk-rgb-num:focus {
    outline: none;
    border-color: var(--cmyk-accent);
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.15);
}

/* Swatch + outputs: 2 columns – left: color + presets, right: outputs */
.cmyk-rgb-swatch-wrap {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
    margin-bottom: 1.25rem;
}

@media (min-width: 640px) {
    .cmyk-rgb-swatch-wrap {
        grid-template-columns: 1fr 1fr;
        align-items: start;
    }
}

.cmyk-rgb-swatch-left {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.cmyk-rgb-swatch {
    width: 100%;
    aspect-ratio: 21 / 9;
    max-height: 140px;
    border-radius: 12px;
    border: 1px solid var(--cmyk-border);
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.06);
}

.cmyk-rgb-outputs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.cmyk-rgb-output-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 0.5rem 0.75rem;
    background: #fff;
    border-radius: 8px;
    border: 1px solid var(--cmyk-border);
}

.cmyk-rgb-output-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--cmyk-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    min-width: 3rem;
}

.cmyk-rgb-output-val {
    flex: 1;
    
    font-size: 0.875rem;
    color: var(--cmyk-text);
    word-break: break-all;
}

.cmyk-rgb-copy {
    padding: 0.35rem 0.65rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--cmyk-accent);
    background: transparent;
    border: 1px solid var(--cmyk-accent);
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.cmyk-rgb-copy:hover {
    background: var(--cmyk-accent);
    color: #fff;
}

/* Presets (inside left column) */
.cmyk-rgb-swatch-wrap .cmyk-rgb-presets {
    margin-top: 0;
}

.cmyk-rgb-presets-label {
    display: block;
    font-size: 0.8125rem;
    color: var(--cmyk-muted);
    margin-bottom: 0.5rem;
}

.cmyk-rgb-preset-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.cmyk-rgb-preset {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--cmyk-text);
    background: #fff;
    border: 1px solid var(--cmyk-border);
    border-radius: 8px;
    cursor: pointer;
    transition: border-color 0.15s, box-shadow 0.15s;
    box-shadow: 0 0 0 2px var(--swatch, transparent) inset;
}

.cmyk-rgb-preset:hover {
    border-color: var(--cmyk-accent);
    box-shadow: 0 0 0 2px var(--swatch, transparent) inset, 0 0 0 2px var(--cmyk-accent);
}

/* Education block */
.cmyk-rgb-edu {
    max-width: 48rem;
    margin: 0 auto;
    padding: 1.5rem;
    background: #fff;
    border-radius: 12px;
    border: 1px solid var(--cmyk-border, #e2e8f0);
}

.cmyk-rgb-edu h2 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.cmyk-rgb-edu h3 {
    font-size: 1rem;
    margin-top: 1rem;
    margin-bottom: 0.35rem;
}

.cmyk-rgb-edu p {
    font-size: 0.9375rem;
    color: var(--cmyk-muted, #64748b);
    margin-bottom: 0.5rem;
}

/* Toast for copy feedback */
.cmyk-rgb-toast {
    position: fixed;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.6rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: #fff;
    background: #0f766e;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1050;
    animation: cmyk-rgb-toast-in 0.2s ease;
}

@keyframes cmyk-rgb-toast-in {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}