/* Tint and Shades Generator – mobile-first, sleek */

:root {
    --tsg-bg: #fafbfc;
    --tsg-surface: #ffffff;
    --tsg-border: #e8eaed;
    --tsg-text: #1a1d21;
    --tsg-muted: #5f6368;
    --tsg-accent: #2563eb;
    --tsg-accent-hover: #1d4ed8;
    --tsg-tint-bg: #eff6ff;
    --tsg-shade-bg: #f1f5f9;
    --tsg-radius: 12px;
    --tsg-radius-sm: 8px;
    --tsg-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --tsg-focus: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

/* Tool panel */
.tsg-tool {
    background: var(--tsg-surface);
    border: 1px solid var(--tsg-border);
    border-radius: var(--tsg-radius);
    box-shadow: var(--tsg-shadow);
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

/* Base color row */
.tsg-base {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
}

.tsg-swatch-wrap {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.35rem;
}

.tsg-swatch {
    width: 72px;
    height: 72px;
    border-radius: var(--tsg-radius-sm);
    border: 2px solid var(--tsg-border);
    box-shadow: var(--tsg-shadow);
}

.tsg-swatch-base {
    width: 80px;
    height: 80px;
}

.tsg-swatch-caption {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--tsg-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.tsg-input-wrap {
    flex: 1;
    min-width: 200px;
}

.tsg-hex-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.tsg-hex-prefix {
    color: var(--tsg-muted);
    font-size: 1rem;
    font-weight: 500;
}

.tsg-hex-input {
    width: 8rem;
    padding: 0.5rem 0.6rem;
    font-size: 1rem;
    border: 1px solid var(--tsg-border);
    border-radius: var(--tsg-radius-sm);
    background: var(--tsg-surface);
    color: var(--tsg-text);
}

.tsg-hex-input:focus {
    outline: none;
    border-color: var(--tsg-accent);
    box-shadow: var(--tsg-focus);
}

.tsg-picker {
    width: 44px;
    height: 44px;
    padding: 2px;
    border: 1px solid var(--tsg-border);
    border-radius: var(--tsg-radius-sm);
    background: var(--tsg-surface);
    cursor: pointer;
}

.tsg-picker::-webkit-color-swatch-wrapper { padding: 2px; }
.tsg-picker::-webkit-color-swatch { border-radius: 6px; border: none; }

.tsg-values {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
    font-size: 0.8125rem;
    color: var(--tsg-muted);
}

/* Controls */
.tsg-controls {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
}

@media (min-width: 640px) {
    .tsg-controls {
        grid-template-columns: repeat(3, 1fr);
    }
}

.tsg-control {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.tsg-control-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--tsg-text);
}

.tsg-control-row {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.tsg-range {
    flex: 1;
    min-width: 0;
    height: 8px;
    border-radius: 4px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--tsg-border);
}

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

.tsg-range::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--tsg-accent);
    cursor: pointer;
    border: none;
}

.tsg-num {
    width: 4rem;
    padding: 0.35rem 0.5rem;
    font-size: 0.9375rem;
    text-align: center;
    border: 1px solid var(--tsg-border);
    border-radius: var(--tsg-radius-sm);
    background: var(--tsg-surface);
    color: var(--tsg-text);
}

.tsg-range-value {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--tsg-muted);
    min-width: 2.5rem;
}

/* Overview strip */
.tsg-overview {
    margin: 0;
}

.tsg-overview-hint {
    font-size: 0.8125rem;
    color: var(--tsg-muted);
    margin-bottom: 0.5rem;
}

.tsg-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    min-height: 44px;
}

.tsg-strip-item {
    width: 40px;
    height: 40px;
    border-radius: var(--tsg-radius-sm);
    border: 2px solid var(--tsg-border);
    cursor: pointer;
    transition: transform 0.15s ease, border-color 0.15s ease;
    flex-shrink: 0;
}

.tsg-strip-item:hover {
    transform: scale(1.08);
    border-color: var(--tsg-accent);
}

.tsg-strip-item.tsg-strip-base {
    border-color: var(--tsg-accent);
    box-shadow: 0 0 0 1px var(--tsg-accent);
}

/* Tints / Shades grids */
.tsg-grids {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

@media (min-width: 768px) {
    .tsg-grids {
        grid-template-columns: 1fr 1fr;
    }
}

.tsg-block {
    border-radius: var(--tsg-radius);
    padding: 1rem;
    border: 1px solid var(--tsg-border);
}

.tsg-tints {
    background: var(--tsg-tint-bg);
}

.tsg-shades {
    background: var(--tsg-shade-bg);
}

.tsg-block-title {
    font-size: 0.9375rem;
    font-weight: 700;
    margin: 0 0 0.75rem 0;
    color: var(--tsg-text);
}

.tsg-swatches {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
    gap: 8px;
}

.tsg-swatch-item {
    aspect-ratio: 1;
    border-radius: var(--tsg-radius-sm);
    border: 2px solid var(--tsg-border);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: transform 0.15s ease, border-color 0.15s ease;
}

.tsg-swatch-item:hover {
    transform: scale(1.06);
    border-color: var(--tsg-accent);
}

.tsg-swatch-item .tsg-swatch-pct {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 3px;
    font-size: 0.6875rem;
    font-weight: 600;
    text-align: center;
    background: rgba(0, 0, 0, 0.75);
    color: #fff;
}

/* Export */
.tsg-export {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--tsg-border);
}

.tsg-export-label {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--tsg-muted);
}

.tsg-export-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tsg-export-btn {
    padding: 0.5rem 0.875rem;
    font-size: 0.8125rem;
    font-weight: 600;
    border: 1px solid var(--tsg-border);
    border-radius: var(--tsg-radius-sm);
    background: var(--tsg-surface);
    color: var(--tsg-text);
    cursor: pointer;
    transition: background 0.15s ease, border-color 0.15s ease;
}

.tsg-export-btn:hover {
    background: var(--tsg-bg);
    border-color: var(--tsg-accent);
    color: var(--tsg-accent);
}

/* Modal */
.tsg-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.45);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.tsg-backdrop[aria-hidden="false"] {
    opacity: 1;
    visibility: visible;
}

.tsg-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: min(340px, calc(100vw - 2rem));
    padding: 0;
    border: 1px solid var(--tsg-border);
    border-radius: var(--tsg-radius);
    background: var(--tsg-surface);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
    z-index: 1001;
}

.tsg-modal::backdrop {
    background: transparent;
}

.tsg-modal-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--tsg-border);
}

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

.tsg-modal-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    line-height: 1;
    border: none;
    background: none;
    color: var(--tsg-muted);
    cursor: pointer;
    border-radius: var(--tsg-radius-sm);
    transition: background 0.15s ease, color 0.15s ease;
}

.tsg-modal-close:hover {
    background: var(--tsg-bg);
    color: var(--tsg-text);
}

.tsg-modal-preview {
    height: 56px;
    margin: 1rem 1.25rem 0;
    border-radius: var(--tsg-radius-sm);
    border: 1px solid var(--tsg-border);
}

.tsg-modal-values {
    padding: 1rem 1.25rem;
    font-size: 0.8125rem;
    color: var(--tsg-text);
}

.tsg-modal-value-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--tsg-border);
}

.tsg-modal-value-row:last-child {
    border-bottom: none;
}

.tsg-modal-copy {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    font-weight: 600;
    border: none;
    border-radius: 4px;
    background: var(--tsg-accent);
    color: #fff;
    cursor: pointer;
    transition: background 0.15s ease;
}

.tsg-modal-copy:hover {
    background: var(--tsg-accent-hover);
}

.tsg-copy-all {
    display: block;
    width: calc(100% - 2.5rem);
    margin: 0 1.25rem 1.25rem;
    padding: 0.6rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    border: none;
    border-radius: var(--tsg-radius-sm);
    background: var(--tsg-accent);
    color: #fff;
    cursor: pointer;
    transition: background 0.15s ease;
}

.tsg-copy-all:hover {
    background: var(--tsg-accent-hover);
}

/* Toast */
.tsg-toast {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%) translateY(100%);
    padding: 0.6rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    background: var(--tsg-text);
    color: #fff;
    border-radius: var(--tsg-radius-sm);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    z-index: 1100;
    opacity: 0;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.tsg-toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}