/* 全局样式 */
body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    color: var(--primary-color);
    background-color: #ffffff;
    line-height: 1.6;
}

h1, h2, h3, h4, h5 {
    font-weight: 300;
    margin-bottom: 1rem;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

    a:hover {
        color: var(--gray-color);
    }

.container {
    max-width: 1200px;
}

.section {
    padding: 6rem 0;
    border-bottom: 1px solid var(--border-color);
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
    position: relative;
}

    .section-title::after {
        content: '';
        display: block;
        width: 50px;
        height: 1px;
        background-color: var(--primary-color);
        margin: 1rem auto 0;
    }

/* 响应式样式 */
@media (max-width: 992px) {
    .yarn-knowledge,
    .contact-container {
        grid-template-columns: 1fr;
    }

    .yarn-text {
        padding-right: 0;
        margin-bottom: 2rem;
    }

    .contact-info {
        padding-right: 0;
        margin-bottom: 2rem;
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .section {
        padding: 4rem 0;
    }

    .process-step {
        flex: 100%;
        margin-bottom: 2rem;
    }

        .process-step:not(:last-child)::after {
            display: none;
        }
}

@media (max-width: 576px) {
    .navbar {
        padding: 1rem 0;
    }

    .nav-link {
        margin-left: 1rem;
        font-size: 0.8rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}