:root {
    --primary-color: #0052CC;
    --secondary-color: #00875A;
    --accent-color: #FF5630;
    --light-gray: #F4F5F7;
    --medium-gray: #DFE1E6;
    --dark-gray: #505F79;
    --text-color: #172B4D;
    --white: #FFFFFF;
    --shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    --border-radius: 4px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--light-gray);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 40px 0;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
}

section {
    margin-bottom: 40px;
}

h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.8rem;
    border-bottom: 2px solid var(--medium-gray);
    padding-bottom: 10px;
}

h3 {
    color: var(--secondary-color);
    margin: 20px 0 15px;
    font-size: 1.4rem;
}

.card {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    padding: 25px;
    margin-bottom: 20px;
}

.chart-container {
    width: 100%;
    height: 400px;
    margin: 20px 0;
}

.analysis-text {
    margin: 20px 0;
}

.analysis-text ul {
    padding-left: 20px;
    margin-bottom: 15px;
}

.analysis-text li {
    margin-bottom: 10px;
}

.reviews-container {
    margin-top: 30px;
}

.review-tabs, .feature-tabs {
    display: flex;
    border-bottom: 1px solid var(--medium-gray);
    margin-bottom: 20px;
}

.tab-button {
    background-color: transparent;
    border: none;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--dark-gray);
    transition: all 0.3s ease;
}

.tab-button:hover {
    color: var(--primary-color);
}

.tab-button.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

.tab-content, .feature-tab-content {
    display: none;
}

.tab-content.active, .feature-tab-content.active {
    display: block;
}

.review {
    background-color: var(--light-gray);
    border-radius: var(--border-radius);
    padding: 15px;
    margin-bottom: 15px;
}

.stars {
    color: var(--accent-color);
    font-size: 1.2rem;
    margin-bottom: 10px;
}

.review-date {
    color: var(--dark-gray);
    font-size: 0.9rem;
    text-align: right;
    margin-top: 10px;
}

.feature-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 20px;
}

.feature-table th {
    background-color: var(--light-gray);
    padding: 12px;
    text-align: left;
    border-bottom: 2px solid var(--medium-gray);
}

.feature-table td {
    padding: 12px;
    border-bottom: 1px solid var(--medium-gray);
    vertical-align: top;
}

.feature-table ul {
    padding-left: 20px;
}

.feature-table li {
    margin-bottom: 5px;
}

footer {
    background-color: var(--dark-gray);
    color: var(--white);
    padding: 20px 0;
    text-align: center;
    margin-top: 50px;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .chart-container {
        height: 300px;
    }
    
    .review-tabs, .feature-tabs {
        flex-direction: column;
    }
    
    .tab-button {
        width: 100%;
        text-align: left;
    }
}