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

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

.about-title {
    font-size: 34px;
    font-weight: 600;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
}

.about-subtitle {
    font-size: 17px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.about-section {
    margin-bottom: 32px;
}

.about-section p {
    color: var(--gray-600);
    margin-bottom: 16px;
}

.about-section p:last-child {
    margin-bottom: 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-top: 24px;
}

.feature-item {
    background: var(--surface);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow-sm);
}

.feature-icon {
    font-size: 24px;
    margin-bottom: 12px;
}

.feature-title {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 6px;
}

.feature-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.data-source-note {
    background: var(--gray-100);
    border-radius: 12px;
    padding: 20px;
    margin-top: 24px;
}

.data-source-note p {
    font-size: 14px;
    color: var(--gray-600);
    margin: 0;
}

.data-source-note a {
    color: var(--primary-color);
    text-decoration: none;
}

.data-source-note a:hover {
    text-decoration: underline;
}

.faq-link-btn {
    display: inline-block;
    margin-top: 12px;
    padding: 10px 28px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 500;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.faq-link-btn:hover {
    opacity: 0.85;
}

@media (max-width: 640px) {
    .about-title {
        font-size: 28px;
    }

    .about-subtitle {
        font-size: 15px;
    }
}