/* Palette Selection Modal */
.palette-modal {
    position: fixed;
    inset: 0;
    z-index: 220;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.palette-modal-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.palette-modal-content {
    position: relative;
    background-color: var(--surface);
    border-radius: var(--radius-lg);
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    z-index: 1;
    animation: modalIn 0.3s ease-out;
}

.palette-modal-header {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border-light);
    text-align: center;
}

.palette-modal-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.palette-modal-hint {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.palette-modal-body {
    padding: 1.5rem;
}

/* Tabs */
.palette-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-light);
    padding-bottom: 0.5rem;
}

.palette-tab {
    padding: 0.5rem 1rem;
    border: none;
    background: none;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    border-radius: var(--radius) var(--radius) 0 0;
    position: relative;
}

.palette-tab:hover {
    color: var(--primary);
}

.palette-tab.active {
    color: var(--primary);
}

.palette-tab.active::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary);
}

/* Tab Content */
.palette-tab-content {
    display: none;
    max-height: 400px;
    overflow-y: auto;
}

.palette-tab-content.active {
    display: block;
}

/* Alphabet Mode - Letter Groups */
.palette-alphabet-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.palette-letter-group {
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    overflow: hidden;
    background-color: var(--surface);
}

.palette-letter-group.collapsed .palette-letter-colors {
    display: none;
}

.palette-letter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    background-color: var(--background);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
}

.palette-letter-header:hover {
    background-color: var(--primary-light);
}

.palette-letter-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.palette-letter-toggle {
    font-size: 0.75rem;
    color: var(--text-secondary);
    width: 1rem;
    text-align: center;
    transition: transform 0.2s;
}

.palette-letter-group.collapsed .palette-letter-toggle {
    transform: rotate(0deg);
}

.palette-letter-group:not(.collapsed) .palette-letter-toggle {
    transform: rotate(90deg);
}

/* Custom Checkbox */
.palette-letter-checkbox {
    position: relative;
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    width: 18px;
    height: 18px;
}

.palette-letter-checkbox input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    width: 0;
    height: 0;
}

.checkmark {
    position: absolute;
    top: 0;
    left: 0;
    width: 18px;
    height: 18px;
    background-color: white;
    border: 2px solid var(--border);
    border-radius: 3px;
    transition: var(--transition);
}

.palette-letter-checkbox:hover input ~ .checkmark {
    border-color: var(--primary);
}

.palette-letter-checkbox input:checked ~ .checkmark {
    background-color: var(--primary);
    border-color: var(--primary);
}

.palette-letter-checkbox input:indeterminate ~ .checkmark {
    background-color: var(--primary-light);
    border-color: var(--primary);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.palette-letter-checkbox input:checked ~ .checkmark:after {
    display: block;
    left: 5px;
    top: 1px;
    width: 4px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.palette-letter-checkbox input:indeterminate ~ .checkmark:after {
    display: block;
    left: 3px;
    top: 7px;
    width: 8px;
    height: 2px;
    background-color: var(--primary);
    border: none;
    transform: none;
}

.palette-letter-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.palette-letter-count {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.palette-letter-colors {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(45px, 1fr));
    gap: 0.35rem;
    padding: 0.75rem;
    background-color: var(--surface);
    border-top: 1px solid var(--border-light);
}

.palette-color-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.35rem;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    background-color: var(--surface);
}

.palette-color-item:hover {
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.palette-color-item.selected {
    border-color: var(--primary);
    background-color: var(--primary-light);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.palette-color-block {
    width: 24px;
    height: 24px;
    border-radius: 3px;
    border: 1px solid rgba(0,0,0,0.1);
    margin-bottom: 0.2rem;
}

.palette-color-key {
    font-size: 0.65rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.palette-color-key {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Sets List Mode - 类似字母排列的折叠卡片 */
.palette-sets-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.palette-set-group {
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    overflow: hidden;
    background-color: var(--surface);
}

.palette-set-group.collapsed .palette-set-colors-grid {
    display: none;
}

.palette-set-group .palette-set-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0.75rem;
    background-color: var(--background);
    cursor: pointer;
    transition: var(--transition);
    user-select: none;
    border-bottom: none;
}

.palette-set-group:not(.collapsed) .palette-set-header {
    border-bottom: 1px solid var(--border-light);
}

.palette-set-group .palette-set-header:hover {
    background-color: var(--primary-light);
}

.palette-set-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.palette-set-toggle {
    font-size: 0.75rem;
    color: var(--text-secondary);
    width: 1rem;
    text-align: center;
    transition: transform 0.2s;
}

.palette-set-group.collapsed .palette-set-toggle {
    transform: rotate(0deg);
}

.palette-set-group:not(.collapsed) .palette-set-toggle {
    transform: rotate(90deg);
}

.palette-set-checkbox {
    position: relative;
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    width: 18px;
    height: 18px;
}

.palette-set-checkbox input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    width: 0;
    height: 0;
}

.palette-set-checkbox .checkmark {
    position: absolute;
    top: 0;
    left: 0;
    width: 18px;
    height: 18px;
    background-color: white;
    border: 2px solid var(--border);
    border-radius: 3px;
    transition: var(--transition);
}

.palette-set-checkbox:hover input ~ .checkmark {
    border-color: var(--primary);
}

.palette-set-checkbox input:checked ~ .checkmark {
    background-color: var(--primary);
    border-color: var(--primary);
}

.palette-set-checkbox input:indeterminate ~ .checkmark {
    background-color: var(--primary-light);
    border-color: var(--primary);
}

.palette-set-checkbox .checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.palette-set-checkbox input:checked ~ .checkmark:after {
    display: block;
    left: 5px;
    top: 1px;
    width: 4px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.palette-set-checkbox input:indeterminate ~ .checkmark:after {
    display: block;
    left: 3px;
    top: 7px;
    width: 8px;
    height: 2px;
    background-color: var(--primary);
    border: none;
    transform: none;
}

.palette-set-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.palette-set-colors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(45px, 1fr));
    gap: 0.35rem;
    padding: 0.75rem;
    background-color: var(--surface);
}

/* Legacy styles for backward compatibility */
.palette-sets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.palette-set-card {
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    cursor: pointer;
    transition: var(--transition);
    background-color: var(--surface);
}

.palette-set-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.palette-set-card.selected {
    border-color: var(--primary);
    background-color: var(--primary-light);
}

.palette-set-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.palette-set-name {
    font-weight: 600;
    font-size: 1rem;
}

.palette-set-count {
    font-size: 0.8rem;
    color: var(--text-secondary);
    background-color: var(--background);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
}

.palette-set-colors {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.palette-set-color-preview {
    width: 20px;
    height: 20px;
    border-radius: 3px;
    border: 1px solid var(--border);
}

.palette-set-more {
    font-size: 0.7rem;
    color: var(--text-secondary);
    padding: 0.2rem;
}

/* Selected Info */
.palette-selected-info {
    margin-top: 1.5rem;
    padding: 0.75rem 1rem;
    background-color: var(--background);
    border-radius: var(--radius);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#palette-selected-count {
    font-weight: 600;
    color: var(--text-primary);
}

.btn-text {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 0.875rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
}

.btn-text:hover {
    text-decoration: underline;
}

/* Modal Footer */
.palette-modal-footer {
    display: flex;
    justify-content: center;
    gap: 1rem;
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-light);
}

/* Legacy styles for backward compatibility */
.palette-selection {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.palette-section {
    border-bottom: 1px solid var(--border-light);
    padding-bottom: 1rem;
}

.palette-section:last-child {
    border-bottom: none;
}

.palette-section-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.palette-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.palette-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border);
    background-color: var(--surface);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition);
}

.palette-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.palette-btn.active {
    background-color: var(--primary);
    border-color: var(--primary);
    color: white;
}

.palette-btn-all {
    background-color: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary-dark);
}

.palette-btn-all.active {
    background-color: var(--primary);
    color: white;
}

/* Responsive */
@media (max-width: 768px) {
    .palette-modal-content {
        max-width: 100%;
        margin: 0;
    }

    .palette-tabs {
        flex-wrap: wrap;
    }

    .palette-tab {
        font-size: 0.8rem;
        padding: 0.4rem 0.75rem;
    }

    .palette-alphabet-list {
        grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
    }

    .palette-sets-grid {
        grid-template-columns: 1fr;
    }

    .palette-color-block {
        width: 28px;
        height: 28px;
    }

    .palette-buttons {
        gap: 0.35rem;
    }

    .palette-btn {
        padding: 0.4rem 0.75rem;
        font-size: 0.8rem;
    }
}

/* Missing Colors Alert */
.missing-colors-alert {
    background-color: #fff7ed;
    border: 1px solid #fdba74;
    border-radius: 8px;
    padding: 0.75rem 1rem;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

.missing-colors-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.625rem;
}

.missing-icon {
    width: 18px;
    height: 18px;
    color: #f97316;
    flex-shrink: 0;
}

.missing-icon svg {
    width: 100%;
    height: 100%;
}

.missing-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: #c2410c;
}

.missing-colors-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.missing-color-item {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    background-color: white;
    border-radius: 6px;
    font-size: 0.8125rem;
    border: 1px solid #fed7aa;
    line-height: 1;
}

.missing-color-item .color-block {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    border: 1px solid rgba(0, 0, 0, 0.15);
    flex-shrink: 0;
}

.missing-color-item .color-key {
    font-weight: 500;
    color: #374151;
    min-width: 2rem;
    line-height: 1;
}

.missing-color-item .color-count {
    color: #6b7280;
    font-size: 0.75rem;
    font-weight: 500;
    line-height: 1;
}

/* Color Match Warning */
.color-match-warning {
    background-color: #fee2e2;
    border: 1px solid #ef4444;
    border-radius: var(--radius);
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: #991b1b;
}

.color-match-warning-icon {
    font-size: 1.25rem;
}