.tool-fullwidth {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
}

/* Tool shell */
.image-tool {
    max-width: 100%;
    margin: 0 auto;
}

.image-tool.editor-section,
.editor-section.image-tool {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.image-tool .card:not(.result-card) {
    border: 1px solid var(--color-border, #e5e7eb);
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(0, 0, 0, 0.06));
    border-radius: var(--radius, 12px);
    background: var(--color-surface, #fff);
}

.image-tool .card-body {
    padding: 1.25rem 1.35rem;
}

.image-tool .card-title {
    color: var(--color-text, #1f2937);
    font-weight: 700;
    font-size: 1.05rem;
}

.image-tool .form-control,
.image-tool .form-select,
.image-tool .select-input,
.image-tool textarea {
    border-radius: 8px;
    border: 1px solid var(--color-border, #e5e7eb);
}

.image-tool .form-control:focus,
.image-tool .form-select:focus,
.image-tool textarea:focus {
    border-color: var(--color-primary, #0d9488);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.image-tool .btn-primary {
    background: var(--color-primary, #0d9488);
    border-color: var(--color-primary, #0d9488);
}

.image-tool .btn-primary:hover {
    background: var(--color-primary-hover, #0f766e);
    border-color: var(--color-primary-hover, #0f766e);
}

.image-tool .alert {
    border-radius: 10px;
}

[data-theme="dark"] .image-tool .card:not(.result-card) {
    background: var(--color-surface, #1f2937);
    border-color: var(--color-border, #374151);
}

[data-theme="dark"] .image-tool .card-title,
[data-theme="dark"] .image-tool .form-label,
[data-theme="dark"] .image-tool {
    color: var(--color-text, #f9fafb);
}

[data-theme="dark"] .image-tool .text-muted,
[data-theme="dark"] .image-tool .form-text {
    color: var(--color-text-secondary, #9ca3af) !important;
}

[data-theme="dark"] .image-tool .form-control,
[data-theme="dark"] .image-tool .form-select,
[data-theme="dark"] .image-tool textarea {
    background: #111827;
    color: var(--color-text, #f9fafb);
    border-color: var(--color-border, #374151);
}

/* --- tool: similar-color-selection-calculator --- */
/* 相近颜色取色计算器样式 */
.similar-color-calculator {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.color-picker-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 2rem;
    color: white;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.color-input-container {
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
    padding: 1.5rem;
    backdrop-filter: blur(10px);
}

.color-preview-large {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 4px solid rgba(255,255,255,0.3);
    margin: 0 auto 1rem;
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
}

.color-preview-large:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 35px rgba(0,0,0,0.3);
}

.similar-colors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
}

.similar-color-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.similar-color-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.15);
    border-color: #007bff;
}

.color-sample {
    width: 100%;
    height: 80px;
    border-radius: 8px;
    margin-bottom: 1rem;
    border: 2px solid #e9ecef;
    transition: all 0.3s ease;
}

.color-sample:hover {
    border-color: #007bff;
    transform: scale(1.02);
}

.color-info {
    font-size: 0.9rem;
}

.color-hex {
    font-family: 'Courier New', monospace;
    font-weight: bold;
    color: #495057;
    margin-bottom: 0.5rem;
}

.color-rgb {
    color: #6c757d;
    font-size: 0.85rem;
}

.color-hsl {
    color: #6c757d;
    font-size: 0.85rem;
}

.copy-btn {
    background: linear-gradient(45deg, #007bff, #0056b3);
    border: none;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.85rem;
    transition: all 0.3s ease;
    width: 100%;
    margin-top: 0.5rem;
}

.copy-btn:hover {
    background: linear-gradient(45deg, #0056b3, #004085);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0,123,255,0.3);
}

.controls-section {
    background: #f8f9fa;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.range-slider {
    width: 100%;
    height: 8px;
    border-radius: 5px;
    background: #ddd;
    outline: none;
    -webkit-appearance: none;
}

.range-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #007bff;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.range-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #007bff;
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.preset-colors {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.preset-color {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.preset-color:hover {
    transform: scale(1.1);
    border-color: #007bff;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.tool-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.btn-custom {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.btn-custom:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.color-harmony-section {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 2rem;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.harmony-colors {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.harmony-color {
    text-align: center;
}

.harmony-sample {
    width: 100%;
    height: 60px;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    border: 2px solid #e9ecef;
}

.harmony-label {
    font-size: 0.8rem;
    color: #6c757d;
    font-weight: 500;
}

@media (max-width: 768px) {
    .similar-colors-grid {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    }
    
    .color-picker-section {
        padding: 1.5rem;
    }
    
    .color-preview-large {
        width: 100px;
        height: 100px;
    }
}