:root {
    --primary-color: #4a90e2;
    --secondary-color: #f5f5f5;
    --text-color: #333;
    --border-radius: 8px;
    --box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #f8f9fa;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
}

.subtitle {
    color: #666;
    font-size: 1.1em;
}

.section {
    background: white;
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: var(--box-shadow);
    margin-bottom: 30px;
}

.progress-bar {
    height: 8px;
    background-color: var(--secondary-color);
    border-radius: 4px;
    margin-bottom: 30px;
    overflow: hidden;
}

.progress {
    height: 100%;
    background-color: var(--primary-color);
    width: 0;
    transition: width 0.3s ease;
}

.options {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
}

.option {
    padding: 15px;
    border: 2px solid var(--secondary-color);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s ease;
}

.option:hover {
    border-color: var(--primary-color);
    background-color: #f0f7ff;
}

.option.selected {
    border-color: var(--primary-color);
    background-color: #e3f2fd;
}

.result-card {
    background: white;
    border-radius: var(--border-radius);
    padding: 25px;
    margin-top: 20px;
}

.result-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.severity-level {
    font-size: 1.2em;
    font-weight: bold;
    color: var(--primary-color);
}

.result-score {
    margin-bottom: 20px;
}

.result-details, .recommendations {
    margin-top: 20px;
}

.btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.3s ease;
    width: 100%;
    margin-top: 20px;
}

.btn:hover {
    background-color: #357abd;
}

.hidden {
    display: none;
}

footer {
    text-align: center;
    margin-top: 40px;
    color: #666;
    font-size: 0.9em;
}

.donate-section {
    text-align: center;
    margin: 30px 0;
    padding: 20px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.donate-section p {
    margin-bottom: 15px;
    color: #666;
}

.donate-btn {
    display: inline-block;
    background-color: #ff6b6b;
    color: white;
    padding: 12px 30px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s ease;
}

.donate-btn:hover {
    background-color: #ff5252;
}

/* 移动端适配 */
@media (max-width: 600px) {
    .container {
        padding: 15px;
    }

    .section {
        padding: 20px;
    }

    h1 {
        font-size: 1.8em;
    }

    .subtitle {
        font-size: 1em;
    }

    .option {
        padding: 12px;
    }
}