.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-description {
    font-size: 1.2rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.tool-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.tool-card {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    padding: 2rem;
}

.card-header h2 {
    color: #333;
    margin-bottom: 0.5rem;
}

.card-header p {
    color: #666;
    margin-bottom: 2rem;
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #333;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.input-with-select {
    display: flex;
    gap: 0.5rem;
}

.unit-select {
    width: 100px;
    padding: 0.75rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 1rem;
}

.measurement-group {
    background: #f8f9ff;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.measurement-group h4 {
    color: #333;
    margin-bottom: 1rem;
}

.visual-guide {
    text-align: center;
}

.visual-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 1rem;
    margin-top: 1rem;
}

.visual-option {
    cursor: pointer;
    padding: 1rem;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    transition: all 0.3s ease;
    text-align: center;
}

.visual-option:hover {
    border-color: #667eea;
    background: #f8f9ff;
}

.visual-option.selected {
    border-color: #667eea;
    background: #667eea;
    color: white;
}

.visual-image {
    font-weight: bold;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.button-group {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    flex: 1;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #f5f5f5;
    color: #666;
    flex: 1;
}

.btn-outline {
    background: transparent;
    border: 2px solid #667eea;
    color: #667eea;
}

.results-section {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.result-item {
    padding: 1.5rem;
    background: #f8f9ff;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

.result-item h3 {
    color: #333;
    margin-bottom: 0.5rem;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 0.5rem;
}

.result-category {
    font-size: 1.1rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    display: inline-block;
}

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

.comp-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: white;
    border-radius: 6px;
    border-left: 3px solid #667eea;
}

.comp-label {
    font-weight: 500;
    color: #333;
}

.comp-value {
    font-weight: 700;
    color: #667eea;
}

.body-fat-chart {
    background: #f0f7ff;
    padding: 1.5rem;
    border-radius: 8px;
}

.chart-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.chart-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: white;
    border-radius: 6px;
    border-left: 4px solid #ddd;
    transition: all 0.3s ease;
}

.chart-bar.active {
    border-left-color: #667eea;
    background: #f8f9ff;
    transform: scale(1.02);
}

.chart-label {
    font-weight: 600;
    color: #333;
}

.chart-range {
    font-size: 0.9rem;
    color: #666;
}

.no-results {
    text-align: center;
    padding: 3rem;
    color: #999;
}

.no-results i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: #ddd;
}

.info-section {
    margin: 3rem 0;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.info-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.info-card h3 {
    color: #333;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-card h3 i {
    color: #667eea;
}

.info-card ul {
    list-style: none;
    padding: 0;
}

.info-card li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #f0f0f0;
}

.tool-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.history-section {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-top: 2rem;
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin: 1rem 0;
}

.history-item {
    padding: 1rem;
    background: #f8f9ff;
    border-radius: 8px;
    border-left: 4px solid #667eea;
}

@media (max-width: 768px) {
    .tool-grid {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .tool-actions {
        flex-direction: column;
    }
    
    .input-with-select {
        flex-direction: column;
    }
    
    .unit-select {
        width: 100%;
    }
    
    .visual-options {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .composition-grid {
        grid-template-columns: 1fr;
    }
}