/* RGB to CMYK Converter - mobile-first, sleek */

:root {
    --rc-bg: var(--bs-body-bg, #fff);
    --rc-surface: var(--bs-secondary-bg, #f8f9fb);
    --rc-surface-2: #f0f2f5;
    --rc-border: var(--bs-border-color, #e2e6eb);
    --rc-text: var(--bs-body-color, #1a1d24);
    --rc-muted: var(--text-muted, #5c6370);
    --rc-accent: #2563eb;
    --rc-accent-hover: #1d4ed8;
    --rc-radius: 16px;
    --rc-radius-sm: 10px;
    --rc-radius-pill: 999px;
    --rc-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    --rc-shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
    --rc-focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.2);
    --rc-red: #ef4444;
    --rc-green: #22c55e;
    --rc-blue: #3b82f6;
}

/* --- Tool interface: full-width card, left input / right result --- */
.rgb-cmyk-tool {
    margin-bottom: 2rem;
}

.rgb-cmyk-card {
    width: 100%;
    display: grid;
    grid-template-columns: 1fr;
    min-height: 0;
    background: var(--rc-bg);
    border: 1px solid var(--rc-border);
    border-radius: var(--rc-radius);
    box-shadow: var(--rc-shadow-md);
    overflow: hidden;
}

.rgb-cmyk-input,
.rgb-cmyk-result {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.rgb-cmyk-input {
    background: var(--rc-surface);
    border-bottom: 1px solid var(--rc-border);
}

.rgb-cmyk-input-title,
.rgb-cmyk-output-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--rc-muted);
    margin: 0 0 0.5rem 0;
}

/* Color picker */
.rgb-cmyk-picker-wrap {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
}

.rgb-cmyk-picker {
    width: 56px;
    height: 56px;
    padding: 0;
    border: 2px solid var(--rc-border);
    border-radius: var(--rc-radius-sm);
    cursor: pointer;
    background: transparent;
    flex-shrink: 0;
}

.rgb-cmyk-picker::-webkit-color-swatch-wrapper {
    padding: 4px;
}

.rgb-cmyk-picker::-webkit-color-swatch {
    border: none;
    border-radius: 6px;
}

.rgb-cmyk-picker::-moz-color-swatch {
    border: none;
    border-radius: 6px;
}

.rgb-cmyk-picker:focus {
    outline: none;
    border-color: var(--rc-accent);
    box-shadow: var(--rc-focus-ring);
}

.rgb-cmyk-picker-label {
    font-size: 0.875rem;
    color: var(--rc-muted);
    margin: 0;
    cursor: pointer;
}

/* Swatch: result preview */
.rgb-cmyk-swatch {
    width: 100%;
    aspect-ratio: 2.2 / 1;
    border-radius: var(--rc-radius-sm);
    background: #ff0000;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--rc-shadow);
    border: 1px solid var(--rc-border);
    transition: background-color 0.15s ease;
}

.rgb-cmyk-swatch-label {
    font-size: clamp(0.875rem, 2.5vw, 1.125rem);
    font-weight: 600;
    letter-spacing: 0.05em;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
    padding: 0.35em 0.6em;
    border-radius: var(--rc-radius-sm);
    background: rgba(0, 0, 0, 0.25);
}

.rgb-cmyk-swatch[data-luminance="high"] .rgb-cmyk-swatch-label {
    color: #1a1d24;
    text-shadow: none;
    background: rgba(255, 255, 255, 0.7);
}

/* Controls: RGB channels */
.rgb-cmyk-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.rgb-cmyk-channel-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
}

.rgb-cmyk-channel-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--rc-text);
    margin: 0;
}

.rgb-cmyk-channel-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--rc-muted);
    font-variant-numeric: tabular-nums;
}

.rgb-cmyk-range {
    width: 100%;
    height: 10px;
    border-radius: var(--rc-radius-pill);
    -webkit-appearance: none;
    appearance: none;
    background: var(--rc-surface-2);
    outline: none;
}

.rgb-cmyk-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--rc-text);
    cursor: pointer;
    box-shadow: var(--rc-shadow);
    border: 2px solid var(--rc-bg);
    transition: transform 0.15s ease;
}

.rgb-cmyk-range::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.rgb-cmyk-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--rc-text);
    cursor: pointer;
    box-shadow: var(--rc-shadow);
    border: 2px solid var(--rc-bg);
}

.rgb-cmyk-range--red { accent-color: var(--rc-red); }
.rgb-cmyk-range--green { accent-color: var(--rc-green); }
.rgb-cmyk-range--blue { accent-color: var(--rc-blue); }

.rgb-cmyk-number {
    width: 100%;
    max-width: 88px;
    padding: 0.5rem 0.65rem;
    font-size: 0.9375rem;
    font-variant-numeric: tabular-nums;
    border: 1px solid var(--rc-border);
    border-radius: var(--rc-radius-sm);
    background: var(--rc-bg);
    color: var(--rc-text);
}

.rgb-cmyk-number:focus {
    outline: none;
    border-color: var(--rc-accent);
    box-shadow: var(--rc-focus-ring);
}

/* Output: CMYK grid */
.rgb-cmyk-output {
    padding: 0;
}

.rgb-cmyk-cmyk-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

.rgb-cmyk-cmyk-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.75rem 0.5rem;
    background: var(--rc-bg);
    border: 1px solid var(--rc-border);
    border-radius: var(--rc-radius-sm);
}

.rgb-cmyk-cmyk-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--rc-muted);
    letter-spacing: 0.05em;
}

.rgb-cmyk-cmyk-num {
    font-size: 1.125rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--rc-text);
    margin-top: 0.25rem;
}

/* Copy formats */
.rgb-cmyk-formats {
    padding: 0;
}

.rgb-cmyk-formats-title,
.rgb-cmyk-samples-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--rc-muted);
    margin: 0 0 0.5rem 0;
}

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

.rgb-cmyk-copy-chip {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.2rem;
    padding: 0.6rem 0.85rem;
    background: var(--rc-surface);
    border: 1px solid var(--rc-border);
    border-radius: var(--rc-radius-sm);
    cursor: pointer;
    text-align: left;
    transition: background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
    min-width: 0;
    flex: 1;
    min-width: 120px;
}

.rgb-cmyk-copy-chip:hover {
    background: var(--rc-surface-2);
    border-color: var(--rc-accent);
    box-shadow: var(--rc-focus-ring);
}

.rgb-cmyk-copy-chip:focus {
    outline: none;
    border-color: var(--rc-accent);
    box-shadow: var(--rc-focus-ring);
}

.rgb-cmyk-copy-chip[data-copied="true"] {
    border-color: var(--rc-green);
    background: rgba(34, 197, 94, 0.08);
}

.rgb-cmyk-copy-label {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--rc-muted);
}

.rgb-cmyk-copy-value {
    font-size: 0.8125rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    color: var(--rc-text);
    word-break: break-all;
}

/* Preset samples */
.rgb-cmyk-samples {
    padding: 0;
}

.rgb-cmyk-samples-scroll {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.rgb-cmyk-sample {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem;
    background: var(--rc-surface);
    border: 2px solid var(--rc-border);
    border-radius: var(--rc-radius-sm);
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.rgb-cmyk-sample::before {
    content: "";
    width: 40px;
    height: 40px;
    border-radius: 8px;
    background: rgb(var(--sample-r, 0), var(--sample-g, 0), var(--sample-b, 0));
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.1);
}

.rgb-cmyk-sample:hover {
    transform: translateY(-2px);
    border-color: var(--rc-accent);
    box-shadow: var(--rc-focus-ring);
}

.rgb-cmyk-sample:focus {
    outline: none;
    border-color: var(--rc-accent);
    box-shadow: var(--rc-focus-ring);
}

.rgb-cmyk-sample-name {
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--rc-muted);
    text-align: center;
}

/* Education block */
.rgb-cmyk-edu {
    margin: 0 auto;
    padding: 1.5rem;
    background: var(--rc-surface);
    border: 1px solid var(--rc-border);
    border-radius: var(--rc-radius);
    box-shadow: var(--rc-shadow);
    margin-bottom: 2rem;
}

.rgb-cmyk-edu-h2 {
    font-size: 1.375rem;
    font-weight: 700;
    margin: 0 0 1.25rem 0;
    color: var(--rc-text);
}

.rgb-cmyk-edu-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
    margin-bottom: 1.25rem;
}

.rgb-cmyk-edu-block {
    margin-bottom: 0;
}

.rgb-cmyk-edu-h3 {
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 0.5rem 0;
    color: var(--rc-text);
}

.rgb-cmyk-edu-block p {
    font-size: 0.9375rem;
    line-height: 1.55;
    color: var(--rc-text);
    margin: 0 0 0.5rem 0;
}

.rgb-cmyk-edu-list {
    margin: 0;
    padding-left: 1.25rem;
    font-size: 0.9375rem;
    line-height: 1.6;
    color: var(--rc-text);
}

.rgb-cmyk-edu-formula {
    margin-bottom: 1rem;
}

.rgb-cmyk-edu-pre {
    margin: 0.5rem 0 0 0;
    padding: 1rem;
    background: var(--rc-bg);
    border: 1px solid var(--rc-border);
    border-radius: var(--rc-radius-sm);
    overflow-x: auto;
}

.rgb-cmyk-edu-pre code {
    font-size: 0.8125rem;
    
    color: var(--rc-text);
    white-space: pre;
}

.rgb-cmyk-edu-note {
    font-size: 0.9375rem;
    line-height: 1.5;
    padding: 1rem;
    background: rgba(37, 99, 235, 0.06);
    border: 1px solid rgba(37, 99, 235, 0.2);
    border-radius: var(--rc-radius-sm);
    color: var(--rc-text);
}

/* Two columns on desktop */
@media (min-width: 768px) {
    .rgb-cmyk-card {
        grid-template-columns: 1fr 1fr;
    }

    .rgb-cmyk-input {
        border-bottom: none;
        border-right: 1px solid var(--rc-border);
        padding: 1.5rem;
    }

    .rgb-cmyk-result {
        padding: 1.5rem;
    }

    .rgb-cmyk-swatch {
        aspect-ratio: 2.6 / 1;
    }

    .rgb-cmyk-formats-list {
        gap: 0.65rem;
    }

    .rgb-cmyk-copy-chip {
        min-width: 120px;
    }
}

@media (min-width: 992px) {
    .rgb-cmyk-input,
    .rgb-cmyk-result {
        padding: 1.75rem;
    }
}

/* Education grid */
@media (min-width: 576px) {
    .rgb-cmyk-edu-grid {
        grid-template-columns: 1fr 1fr;
    }
}