/* --- Tool hero (required) --- */
.tool-hero {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.hero-text {
    flex: 1;
    min-width: 260px;
}

.hero-text h1 {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 0;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-muted);
    max-width: 820px;
    margin-bottom: 1rem;
    margin-top: 0;
}

@media (max-width: 767px) {
    .hero-text h1 {
        font-size: clamp(1.75rem, 5vw, 2.5rem);
    }

    .hero-subtitle {
        font-size: clamp(1rem, 3vw, 1.125rem);
    }
}

/* --- Color Blindness Simulator (mobile-first) --- */
.cbs-tool {
    --cbs-radius: 14px;
    --cbs-radius-sm: 10px;
    --cbs-gap: 1.25rem;
    --cbs-panel-bg: var(--bs-body-bg, #fff);
    --cbs-panel-border: 1px solid var(--bs-border-color-translucent, rgba(0, 0, 0, 0.08));
    --cbs-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    --cbs-focus-ring: 0 0 0 3px rgba(13, 110, 253, 0.25);
    --cbs-text: var(--bs-body-color, #212529);
    --cbs-muted: var(--text-muted, #6c757d);
    display: flex;
    flex-direction: column;
    gap: var(--cbs-gap);
    margin-bottom: 2rem;
}

.cbs-panel {
    background: var(--cbs-panel-bg);
    border: var(--cbs-panel-border);
    border-radius: var(--cbs-radius);
    padding: 1.25rem;
    box-shadow: var(--cbs-shadow);
}

.cbs-panel-title {
    font-size: 1.125rem;
    font-weight: 700;
    margin: 0 0 0.25rem 0;
    color: var(--cbs-text);
}

.cbs-panel-desc {
    font-size: 0.875rem;
    color: var(--cbs-muted);
    margin: 0 0 1rem 0;
}

/* Colors input block */
.cbs-colors {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.cbs-color-row {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.cbs-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--cbs-muted);
    letter-spacing: 0.02em;
}

.cbs-swatch-wrap {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.cbs-swatch {
    width: 48px;
    min-width: 48px;
    height: 44px;
    border-radius: var(--cbs-radius-sm);
    border: var(--cbs-panel-border);
    flex-shrink: 0;
}

.cbs-color-inputs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex: 1;
    min-width: 0;
}

.cbs-hex-prefix {
    font-size: 0.9375rem;
    color: var(--cbs-muted);
    font-weight: 500;
}

.cbs-hex {
    width: 5.5em;
    min-width: 0;
    padding: 0.5rem 0.65rem;
    font-size: 0.9375rem;
    border: var(--cbs-panel-border);
    border-radius: var(--cbs-radius-sm);
    background: var(--cbs-panel-bg);
    color: var(--cbs-text);
}

.cbs-hex:focus {
    outline: none;
    box-shadow: var(--cbs-focus-ring);
}

.cbs-picker {
    width: 44px;
    min-width: 44px;
    height: 44px;
    padding: 4px;
    border: var(--cbs-panel-border);
    border-radius: var(--cbs-radius-sm);
    background: var(--cbs-panel-bg);
    cursor: pointer;
    -webkit-appearance: none;
    appearance: none;
}

.cbs-picker::-webkit-color-swatch-wrapper {
    padding: 2px;
}

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

/* Severity */
.cbs-severity {
    margin-top: 1.25rem;
    padding-top: 1.25rem;
    border-top: var(--cbs-panel-border);
}

.cbs-severity-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.cbs-severity-min,
.cbs-severity-max {
    font-size: 0.75rem;
    color: var(--cbs-muted);
}

.cbs-range {
    flex: 1;
    min-width: 100px;
    height: 8px;
    -webkit-appearance: none;
    appearance: none;
    background: linear-gradient(to right, #2e7d32, #c62828);
    border-radius: 4px;
}

.cbs-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #fff;
    border: 2px solid var(--bs-primary, #0d6efd);
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.cbs-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #fff;
    border: 2px solid var(--bs-primary, #0d6efd);
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.cbs-severity-num {
    width: 3.5rem;
    padding: 0.4rem 0.5rem;
    font-size: 0.9375rem;
    text-align: center;
    border: var(--cbs-panel-border);
    border-radius: var(--cbs-radius-sm);
    background: var(--cbs-panel-bg);
    color: var(--cbs-text);
}

.cbs-severity-unit {
    font-size: 0.875rem;
    color: var(--cbs-muted);
}

/* Simulations grid */
.cbs-simulations {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    list-style: none;
    padding: 0;
    margin: 0;
}

.cbs-vision {
    border-radius: var(--cbs-radius);
    overflow: hidden;
    border: var(--cbs-panel-border);
    background: var(--cbs-panel-bg);
}

.cbs-vision-head {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    color: #fff;
    font-size: 0.875rem;
}

.cbs-vision-name {
    font-weight: 700;
}

.cbs-vision-pct {
    font-size: 0.75rem;
    opacity: 0.9;
}

.cbs-vision-normal {
    background: linear-gradient(135deg, #1b5e20, #2e7d32);
}

.cbs-vision-protanopia {
    background: linear-gradient(135deg, #b71c1c, #d32f2f);
}

.cbs-vision-deuteranopia {
    background: linear-gradient(135deg, #e65100, #f57c00);
}

.cbs-vision-tritanopia {
    background: linear-gradient(135deg, #4a148c, #7b1fa2);
}

.cbs-vision-achromatopsia {
    background: linear-gradient(135deg, #37474f, #546e7a);
}

.cbs-vision-preview {
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
}

.cbs-vision-desc {
    margin: 0;
    padding: 0.75rem 1rem;
    font-size: 0.8125rem;
    color: var(--cbs-muted);
    background: var(--bs-tertiary-bg, rgba(0, 0, 0, 0.03));
}

/* Palettes (horizontal scroll on mobile) */
.cbs-palettes {
    display: flex;
    gap: 0.75rem;
    overflow-x: auto;
    padding-bottom: 0.25rem;
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
    list-style: none;
    padding-left: 0;
    margin: 0;
}

.cbs-palette {
    flex: 0 0 auto;
    width: 100px;
    height: 72px;
    border-radius: var(--cbs-radius-sm);
    border: 2px solid transparent;
    background: linear-gradient(135deg, var(--cbs-palette-a, #ccc), var(--cbs-palette-b, #999));
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    transition: border-color 0.2s, transform 0.15s;
}

.cbs-palette:hover {
    border-color: var(--bs-primary, #0d6efd);
}

.cbs-palette:focus-visible {
    outline: none;
    box-shadow: var(--cbs-focus-ring);
}

.cbs-palette-label {
    font-size: 0.6875rem;
    font-weight: 600;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
    padding: 0.25rem 0.35rem;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 4px;
    margin-bottom: 0.25rem;
}

/* Actions */
.cbs-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.cbs-btn {
    padding: 0.6rem 1.1rem;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: var(--cbs-radius-sm);
    border: none;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.cbs-btn:focus-visible {
    outline: none;
    box-shadow: var(--cbs-focus-ring);
}

.cbs-btn-primary {
    background: var(--bs-primary, #0d6efd);
    color: #fff;
}

.cbs-btn-primary:hover {
    filter: brightness(1.08);
}

.cbs-btn-secondary {
    background: var(--bs-secondary-bg, #e9ecef);
    color: var(--cbs-text);
}

.cbs-btn-secondary:hover {
    background: var(--bs-tertiary-bg, #dee2e6);
}

/* About / facts */
.cbs-about {
    padding: 1.25rem;
    background: var(--bs-tertiary-bg, rgba(0, 0, 0, 0.03));
    border-radius: var(--cbs-radius);
    border: var(--cbs-panel-border);
}

.cbs-about-title {
    font-size: 1rem;
    font-weight: 700;
    margin: 0 0 1rem 0;
    color: var(--cbs-text);
}

.cbs-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.cbs-stat {
    text-align: center;
    padding: 0.75rem;
    background: var(--cbs-panel-bg);
    border-radius: var(--cbs-radius-sm);
    border: var(--cbs-panel-border);
}

.cbs-stat-num {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--bs-primary, #0d6efd);
}

.cbs-stat-label {
    font-size: 0.75rem;
    color: var(--cbs-muted);
}

.cbs-about-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.cbs-about-block {
    flex: 1;
    min-width: 0;
}

.cbs-about-heading {
    font-size: 0.9375rem;
    font-weight: 700;
    margin: 0 0 0.5rem 0;
    color: var(--cbs-text);
}

.cbs-about-list {
    margin: 0;
    padding-left: 1.25rem;
    font-size: 0.875rem;
    color: var(--cbs-muted);
    line-height: 1.5;
}

.cbs-about-list li {
    margin-bottom: 0.35rem;
}

/* Toast */
.cbs-toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.75rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 500;
    background: #1b5e20;
    color: #fff;
    border-radius: var(--cbs-radius-sm);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    max-width: calc(100vw - 2rem);
    transition: opacity 0.2s, transform 0.2s;
}

.cbs-toast[hidden] {
    display: none;
}

/* Tablet and up */
@media (min-width: 576px) {
    .cbs-panel {
        padding: 1.5rem;
    }

    .cbs-colors {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 1.25rem;
    }

    .cbs-color-row {
        gap: 0.6rem;
    }

    .cbs-simulations {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
    }

    .cbs-vision-preview {
        min-height: 140px;
        font-size: 1.25rem;
    }

    .cbs-stats {
        grid-template-columns: repeat(4, 1fr);
    }

    .cbs-about-grid {
        flex-direction: row;
    }
}

/* Desktop */
@media (min-width: 992px) {
    .cbs-simulations {
        grid-template-columns: repeat(3, 1fr);
    }

    .cbs-palettes {
        flex-wrap: wrap;
        overflow-x: visible;
    }

    .cbs-palette {
        width: 110px;
        height: 80px;
    }
}