/* 首页特定样式 */
.page-intro {
    text-align: center;
    max-width: 800px;
    margin: 30px auto 50px;
    padding: 0 20px;
}

.page-intro h2 {
    color: var(--color-primary);
    font-size: var(--font-size-2xl);
    margin-bottom: 15px;
}

.page-intro p {
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
    font-size: var(--font-size-lg);
}

.section-title {
    text-align: center;
    margin: 40px 0 20px;
    color: var(--color-primary);
    font-size: var(--font-size-2xl);
}

/* 顶部动画效果 */
.animated-intro {
    opacity: 0;
    animation: fadeInUp 0.8s forwards;
    animation-delay: 0.3s;
}

/* 卡片的逐个动画 */
.feature-card {
    opacity: 0;
    animation: fadeInUp 0.6s forwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }
.feature-card:nth-child(5) { animation-delay: 0.5s; }
.feature-card:nth-child(6) { animation-delay: 0.6s; }
.feature-card:nth-child(7) { animation-delay: 0.7s; }
.feature-card:nth-child(8) { animation-delay: 0.8s; }
.feature-card:nth-child(9) { animation-delay: 0.8s; }