:root {
    --ut-color-primary-500: #667eea;
    --ut-color-primary-600: #5a67d8;
    --ut-color-accent-500: #764ba2;
    --ut-color-text: #212529;
    --ut-color-text-muted: #6c757d;
    --ut-color-border: #e9ecef;
    --ut-color-surface: #ffffff;
    --ut-color-surface-muted: #f8f9fa;
    --ut-color-focus: rgba(102, 126, 234, 0.25);
    --ut-gradient-primary: linear-gradient(135deg, var(--ut-color-primary-500) 0%, var(--ut-color-accent-500) 100%);
    --ut-gradient-muted: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    --ut-space-1: 8px;
    --ut-space-2: 16px;
    --ut-space-3: 24px;
    --ut-space-4: 32px;
    --ut-space-5: 40px;
    --ut-radius-sm: 6px;
    --ut-radius-md: 8px;
    --ut-radius-lg: 12px;
    --ut-radius-xl: 20px;
    --ut-shadow-sm: 0 4px 20px rgba(0, 0, 0, 0.08);
    --ut-shadow-md: 0 6px 30px rgba(0, 0, 0, 0.12);
    --ut-shadow-lg: 0 15px 40px rgba(0, 0, 0, 0.15);
    --ut-transition-fast: 0.2s ease;
    --ut-transition-base: 0.3s ease;
}

html,
body {
    color: var(--ut-color-text);
    background: var(--ut-color-surface);
}

a {
    color: var(--ut-color-primary-500);
    text-decoration: none;
}

a:hover {
    color: var(--ut-color-accent-500);
}

.brand-img {
    width: 28px;
    height: 28px;
    display: block;
    object-fit: contain;
}

:focus-visible {
    outline: none;
    box-shadow: 0 0 0 0.2rem var(--ut-color-focus);
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

.utool-page-container {
    margin-top: var(--ut-space-4);
    margin-bottom: calc(var(--ut-space-4) + var(--ut-space-2));
}

.utool-page-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--ut-color-primary-500);
    color: var(--ut-color-text);
    display: flex;
    align-items: center;
    gap: 12px;
}

.utool-page-title i {
    color: var(--ut-color-primary-500);
}

.utool-card {
    border: none;
    border-radius: var(--ut-radius-lg);
    box-shadow: var(--ut-shadow-sm);
    transition: box-shadow var(--ut-transition-base);
    background: var(--ut-color-surface);
}

.utool-card:hover {
    box-shadow: var(--ut-shadow-md);
}

.utool-card-header {
    background: var(--ut-gradient-primary);
    color: white;
    border-radius: var(--ut-radius-lg) var(--ut-radius-lg) 0 0;
    padding: 18px 24px;
    font-weight: 600;
}

.utool-card-body {
    padding: 24px;
}

.utool-btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
    padding: 16px;
    background: var(--ut-gradient-muted);
    border-radius: 8px;
}

.utool-btn {
    padding: 12px 24px;
    border-radius: var(--ut-radius-md);
    font-weight: 500;
    transition: all var(--ut-transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    cursor: pointer;
    font-size: 14px;
}

.utool-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.utool-btn:active {
    transform: translateY(0);
}

.utool-btn-primary {
    background: var(--ut-gradient-primary);
    color: white;
}

.utool-btn-success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    color: white;
}

.utool-btn-info {
    background: linear-gradient(135deg, #2193b0 0%, #6dd5ed 100%);
    color: white;
}

.utool-btn-warning {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
}

.utool-btn-secondary {
    background: linear-gradient(135deg, #636363 0%, #a2ab58 100%);
    color: white;
}

.utool-form-label {
    font-weight: 600;
    margin-bottom: 12px;
    color: #495057;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 15px;
}

.utool-form-label i {
    color: var(--ut-color-primary-500);
}

.utool-textarea {
    min-height: 280px;
    width: 100%;
    font-family: 'Consolas', 'Monaco', 'Courier New', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 15px;
    line-height: 1.8;
    letter-spacing: 0.5px;
    resize: vertical;
    border: 2px solid var(--ut-color-border);
    border-radius: var(--ut-radius-md);
    padding: 16px;
    transition: all var(--ut-transition-base);
    background: var(--ut-color-surface-muted);
    word-wrap: break-word;
    word-break: break-word;
    white-space: pre-wrap;
    overflow-wrap: break-word;
    box-sizing: border-box;
}

.utool-textarea:focus {
    border-color: var(--ut-color-primary-500);
    box-shadow: 0 0 0 0.2rem var(--ut-color-focus);
    background: white;
    outline: none;
}

.utool-textarea[readonly] {
    background: #f1f3f5;
    cursor: not-allowed;
}

.utool-textarea::placeholder {
    color: #adb5bd;
    font-style: italic;
}

.utool-stats-info {
    margin-top: 14px;
    padding: 14px 18px;
    background: var(--ut-gradient-muted);
    border-radius: var(--ut-radius-md);
    font-size: 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 18px;
    align-items: center;
    border: 1px solid var(--ut-color-border);
}

.utool-stats-info strong {
    color: var(--ut-color-primary-500);
    font-weight: 700;
}

.utool-error-message {
    margin-top: 18px;
    padding: 16px 20px;
    background: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
    border-left: 4px solid #dc3545;
    border-radius: 8px;
    color: #721c24;
    display: none;
    animation: slideIn 0.3s ease;
    font-size: 14px;
    line-height: 1.6;
}

.utool-success-message {
    margin-top: 18px;
    padding: 16px 20px;
    background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
    border-left: 4px solid #28a745;
    border-radius: 8px;
    color: #155724;
    display: none;
    animation: slideIn 0.3s ease;
    font-size: 14px;
    line-height: 1.6;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.utool-section-title {
    font-size: 1.35rem;
    font-weight: 600;
    margin-bottom: 18px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--ut-color-border);
    color: #495057;
    display: flex;
    align-items: center;
    gap: 10px;
}

.utool-section-title i {
    color: var(--ut-color-primary-500);
}

.utool-help-card {
    margin-top: 30px;
    border-left: 4px solid var(--ut-color-primary-500);
}

.utool-help-card .utool-card-header {
    background: linear-gradient(135deg, var(--ut-color-primary-500) 0%, var(--ut-color-primary-600) 100%);
}

.utool-help-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.utool-help-list li {
    padding: 12px 0;
    padding-left: 32px;
    position: relative;
    border-bottom: 1px solid #f1f3f5;
    font-size: 14px;
    line-height: 1.7;
}

.utool-help-list li:last-child {
    border-bottom: none;
}

.utool-help-list li:before {
    content: '\f058';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    position: absolute;
    left: 0;
    top: 12px;
    color: #28a745;
    font-size: 16px;
}

.utool-help-list strong {
    color: var(--ut-color-primary-500);
    font-weight: 600;
}

.utool-input-group {
    margin-bottom: 24px;
}

.utool-input-group label {
    font-weight: 600;
    margin-bottom: 10px;
    display: block;
    color: #495057;
    font-size: 15px;
}

.utool-input-group input[type="text"],
.utool-input-group input[type="password"],
.utool-input-group input[type="number"],
.utool-input-group select {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.3s ease;
    background: #f8f9fa;
    box-sizing: border-box;
}

.utool-input-group input:focus,
.utool-input-group select:focus {
    border-color: var(--ut-color-primary-500);
    box-shadow: 0 0 0 0.2rem var(--ut-color-focus);
    background: white;
    outline: none;
}

.utool-radio-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.utool-radio-item {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 6px;
    transition: all 0.2s ease;
    background: #f8f9fa;
    border: 2px solid #e9ecef;
}

.utool-radio-item:hover {
    border-color: var(--ut-color-primary-500);
    background: white;
}

.utool-radio-item input[type="radio"] {
    cursor: pointer;
    width: 18px;
    height: 18px;
}

.utool-radio-item input[type="radio"]:checked + span {
    color: var(--ut-color-primary-500);
    font-weight: 600;
}

.utool-switch-group {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.utool-switch-item {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 6px;
    transition: all 0.2s ease;
    background: #f8f9fa;
    border: 2px solid #e9ecef;
}

.utool-switch-item:hover {
    border-color: var(--ut-color-primary-500);
    background: white;
}

.utool-switch-item input[type="checkbox"] {
    cursor: pointer;
    width: 18px;
    height: 18px;
}

.utool-switch-item input[type="checkbox"]:checked + span {
    color: var(--ut-color-primary-500);
    font-weight: 600;
}

.utool-result-section {
    margin-top: 28px;
    padding: 24px;
    background: #f8f9fa;
    border-radius: var(--ut-radius-md);
    border: 2px solid var(--ut-color-border);
}

.utool-result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
    flex-wrap: wrap;
    gap: 14px;
}

.utool-result-header h5 {
    margin: 0;
    color: #495057;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.15rem;
    font-weight: 600;
}

.utool-result-stats {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.utool-badge {
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}

.utool-badge-success {
    background: #d4edda;
    color: #155724;
}

.utool-badge-danger {
    background: #f8d7da;
    color: #721c24;
}

.utool-badge-secondary {
    background: #e2e3e5;
    color: #383d41;
}

.utool-code-block {
    background: #282c34;
    color: #abb2bf;
    padding: 18px;
    border-radius: 8px;
    overflow-x: auto;
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 18px;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.utool-legend {
    margin-top: 24px;
    padding: 18px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 2px solid #e9ecef;
}

.utool-legend h6 {
    margin-bottom: 14px;
    color: #495057;
    font-weight: 600;
    font-size: 15px;
}

.utool-legend-items {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.utool-legend-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
}

.utool-legend-color {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    flex-shrink: 0;
    border: 2px solid #e9ecef;
}

.utool-legend-color.added {
    background: #d4edda;
}

.utool-legend-color.removed {
    background: #f8d7da;
}

.utool-legend-color.unchanged {
    background: #e9ecef;
}

.utool-tooltip-icon {
    color: #6c757d;
    cursor: help;
    margin-left: 6px;
    transition: color 0.2s ease;
}

.utool-tooltip-icon:hover {
    color: var(--ut-color-primary-500);
}

.utool-help-text {
    font-size: 13px;
    color: #6c757d;
    margin-top: 6px;
    line-height: 1.6;
}

.utool-spinner {
    display: inline-block;
    width: 1rem;
    height: 1rem;
    border: 0.2em solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spinner-border 0.75s linear infinite;
}

.utool-spinner.active {
    display: inline-block;
}

@keyframes spinner-border {
    100% {
        transform: rotate(360deg);
    }
}

@media (max-width: 768px) {
    .utool-page-title {
        font-size: 1.5rem;
    }

    .utool-btn-group {
        flex-direction: column;
        padding: 12px;
    }

    .utool-btn {
        width: 100%;
        justify-content: center;
        padding: 14px 20px;
    }

    .utool-textarea {
        min-height: 220px;
        font-size: 14px;
        padding: 14px;
    }

    .utool-stats-info {
        flex-direction: column;
        gap: 10px;
    }

    .utool-result-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .utool-card-body {
        padding: 18px;
    }

    .utool-input-group {
        margin-bottom: 20px;
    }

    .utool-radio-group {
        flex-direction: column;
        gap: 10px;
    }

    .utool-switch-group {
        flex-direction: column;
        gap: 12px;
    }
}

@media (max-width: 576px) {
    .utool-page-container {
        margin-top: 20px;
        margin-bottom: 30px;
    }

    .utool-card-body {
        padding: 16px;
    }

    .utool-btn-group {
        padding: 10px;
        gap: 10px;
    }

    .utool-textarea {
        min-height: 180px;
        font-size: 13px;
        line-height: 1.7;
    }

    .utool-form-label {
        font-size: 14px;
    }
}