/* ============================================
   SVG Background Remover - Tool-Specific Styles
   Inherits base styles from custom_styles.css
   ============================================ */

/* Options Toggle */
.options-toggle {
    padding: 0 2rem;
    margin: 0.5rem 0;
}

.btn-options {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 12px 16px;
    background: var(--card-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-options:hover {
    background: var(--card-bg);
    border-color: var(--primary);
    color: var(--text-primary);
}

.btn-options .chevron-icon {
    margin-left: auto;
    transition: transform 0.3s ease;
}

.btn-options.active .chevron-icon {
    transform: rotate(180deg);
}

/* Advanced Options Panel */
.advanced-options {
    padding: 1.5rem 2rem;
    border-top: 1px solid var(--border-color);
    background: var(--card-secondary);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.options-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

@media (max-width: 600px) {
    .options-grid {
        grid-template-columns: 1fr;
    }
}

.option-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.option-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
}

.option-label i {
    color: var(--primary);
}

.option-select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--input-bg);
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: border-color 0.2s ease;
}

.option-select:focus {
    outline: none;
    border-color: var(--primary);
}

/* Threshold Controls */
.threshold-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    padding: 1rem;
    background: var(--card-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

@media (max-width: 600px) {
    .threshold-controls {
        grid-template-columns: 1fr;
    }
}

.color-input-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.color-picker {
    width: 44px;
    height: 36px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 2px;
    background: var(--input-bg);
}

.color-hex {
    font-family: monospace;
    font-size: 14px;
    color: var(--text-muted);
}

.range-slider {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--border-color);
    outline: none;
    transition: opacity 0.2s;
}

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

/* Checkbox Options */
.options-checks {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.check-option {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s;
}

.check-option:hover {
    color: var(--text-primary);
}

.check-option input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary);
    cursor: pointer;
}

/* Preview Section */
.preview-section {
    margin: 0 2rem;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--card-bg);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.preview-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
}

.preview-label i {
    color: var(--primary);
}

.btn-preview-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--card-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
}

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

.checkerboard-bg {
    background-image:
        linear-gradient(45deg, var(--checker-color) 25%, transparent 25%),
        linear-gradient(-45deg, var(--checker-color) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--checker-color) 75%),
        linear-gradient(-45deg, transparent 75%, var(--checker-color) 75%);
    background-size: 20px 20px;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.preview-content {
    border-radius: var(--radius-sm);
    min-height: 200px;
    max-height: 400px;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.preview-pane {
    display: none;
    width: 100%;
    text-align: center;
}

.preview-pane.active {
    display: block;
}

.preview-pane svg {
    max-width: 100%;
    max-height: 350px;
    height: auto;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    padding: 1.5rem 2rem;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--button-primary-bg);
    color: var(--button-primary-text);
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--button-primary-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-lg {
    padding: 16px 40px;
    font-size: 17px;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 24px;
    background: var(--card-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-secondary:hover {
    background: var(--card-bg);
    border-color: var(--error-color);
    color: var(--error-color);
}

/* Download Button */
.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    background: var(--success-color);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 16px;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 14px rgba(46, 204, 113, 0.35);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(46, 204, 113, 0.45);
    filter: brightness(1.05);
}

.download-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin-top: 1rem;
}

.download-info {
    font-size: 13px;
    color: var(--text-muted);
}

/* File List */
.file-info-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.file-list {
    max-height: 160px;
    overflow-y: auto;
}

.file-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
    font-size: 13px;
    color: var(--text-secondary);
}

.file-item + .file-item {
    border-top: 1px solid var(--border-light);
}

.file-item-name {
    font-weight: 600;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 75%;
}

.file-item-size {
    color: var(--text-muted);
    font-size: 12px;
}

/* Upload limit text */
.upload-limit {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* Info Section Improvements */
.info-section p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin: 0;
}

.info-section h3 {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Responsive */
@media (max-width: 768px) {
    .action-buttons {
        flex-direction: column;
        padding: 1rem;
    }

    .action-buttons button,
    .action-buttons a {
        width: 100%;
        justify-content: center;
    }

    .preview-section {
        margin: 0 1rem;
    }

    .advanced-options {
        padding: 1rem;
    }

    .options-checks {
        flex-direction: column;
    }

    .preview-header {
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }
}