:root {
    --surface: #ffffff;
    --surface-muted: #f4f6fb;
    --border: #e3e8f2;
    --text-main: #1c2333;
    --text-muted: #5f6b85;
    --primary: #4f46ef;
    --primary-dark: #312e81;
    --primary-light: #6366f1;
    --accent: #36cfc9;
    --success: #10b981;
    --info: #3b82f6;
    --danger: #ef4444;
    --shadow-soft: 0 20px 45px rgba(15, 23, 42, 0.08);
    --shadow-medium: 0 10px 25px rgba(15, 23, 42, 0.1);
    --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Tool Wrapper */
.filter-tool-wrapper {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-bottom: 40px;
}

/* Tool Cards */
.tool-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    padding: 32px;
    transition: var(--transition);
}

.tool-card:hover {
    box-shadow: var(--shadow-medium);
}

.card-header {
    margin-bottom: 24px;
}

.card-title {
    font-size: 24px;
    font-weight: 700;
    color: var(--text-main);
    margin: 0 0 8px 0;
}

.card-description {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.5;
}

/* Form Elements */
.form-group {
    margin-bottom: 24px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    line-height: 1.5;
    color: var(--text-main);
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
    
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 239, 0.1);
}

.form-input::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

.textarea-input {
    resize: vertical;
    min-height: 120px;
    
}

/* Range Inputs */
.ranges-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 16px;
}

.range-item {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 16px;
    background: var(--surface-muted);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    transition: var(--transition);
}

.range-item:hover {
    border-color: var(--primary-light);
    background: #f8f9ff;
}

.range-inputs {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.range-inputs .form-input {
    flex: 1;
    min-width: 100px;
    max-width: 150px;
}

.range-separator {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    white-space: nowrap;
}

.range-label {
    flex: 1;
}

/* Buttons */
.action-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 24px;
}

.btn-primary,
.btn-secondary,
.btn-success,
.btn-info {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 15px;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    
    white-space: nowrap;
}

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

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

.btn-secondary {
    background: var(--surface-muted);
    color: var(--text-main);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    background: var(--border);
    border-color: var(--text-muted);
}

.btn-success {
    background: var(--success);
    color: white;
}

.btn-success:hover {
    background: #059669;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-info {
    background: var(--info);
    color: white;
}

.btn-info:hover {
    background: #2563eb;
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    background: var(--danger);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    font-size: 14px;
}

.btn-icon:hover {
    background: #dc2626;
    transform: scale(1.05);
}

/* Checkboxes */
.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    user-select: none;
}

.checkbox-input {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--primary);
}

.checkbox-text {
    font-size: 15px;
    color: var(--text-main);
}

/* Results */
.results-card {
    margin-top: 24px;
}

.results-content {
    margin-bottom: 24px;
}

.filtered-numbers {
    background: var(--surface-muted);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 16px;
}

.filtered-numbers h6 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    margin: 0 0 12px 0;
}

.numbers-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.number-item {
    display: inline-flex;
    align-items: center;
    padding: 6px 12px;
    background: var(--primary);
    color: white;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.number-item:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* Statistics */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.stat-card {
    background: var(--surface-muted);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.stat-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.2;
}

/* Empty State */
.filtered-numbers em {
    color: var(--text-muted);
    font-style: italic;
}

/* Mobile Responsive */
@media (max-width: 767px) {
    .tool-card {
        padding: 24px 20px;
    }

    .card-title {
        font-size: 20px;
    }

    .range-inputs {
        flex-direction: column;
        align-items: stretch;
    }

    .range-inputs .form-input {
        max-width: 100%;
    }

    .range-separator {
        text-align: center;
        padding: 4px 0;
    }

    .range-item {
        padding: 12px;
    }

    .action-buttons {
        flex-direction: column;
    }

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

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .stat-card {
        padding: 16px;
    }

    .stat-value {
        font-size: 24px;
    }

    .numbers-container {
        gap: 6px;
    }

    .number-item {
        font-size: 13px;
        padding: 5px 10px;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    }