@media (max-width: 1200px) {
    body {
        font-size: 16px;
    }
    
    .container {
        padding: 20px;
    }
    
    .header, .footer {
        text-align: center;
    }
    
    .profile-image {
        width: 100%;
        height: auto;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    .section {
        margin-bottom: 20px;
    }
    
    .skills {
        flex-direction: column;
    }
    
    /* 作品集响应式 */
    #portfolio ul {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    #portfolio li {
        padding: 15px;
    }
    
    /* 教育和工作经历响应式 */
    .education-item, .experience-item {
        padding: 15px;
        margin-bottom: 20px;
    }
    
    .education-item h3, .experience-item h3 {
        font-size: 1.1em;
    }
    
    .date {
        font-size: 0.8em;
        padding: 3px 10px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 24px;
    }
    
    .contact-info {
        font-size: 14px;
    }
    
    .experience, .education {
        font-size: 14px;
    }
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
    body {
        padding: 10px;
    }

    header {
        padding: 20px 0;
    }

    .profile-image {
        position: static;
        margin: 0 auto 20px;
        display: block;
    }

    section {
        padding: 20px;
    }

    #skills ul, #interests ul {
        justify-content: center;
    }
    
    /* 作品集移动端优化 */
    #portfolio ul {
        grid-template-columns: 1fr;
    }
    
    #portfolio li {
        padding: 15px;
    }
    
    #portfolio li strong {
        font-size: 1em;
    }
    
    /* 经历项目移动端优化 */
    .education-item, .experience-item {
        padding: 15px;
        border-left-width: 3px;
    }
    
    .education-item:hover, .experience-item:hover {
        border-left-width: 4px;
        transform: translateX(3px);
    }
    
    /* 思维导图移动端优化 */
    .roadmap-item {
        padding: 15px;
        margin-bottom: 15px;
    }
    
    .roadmap-item h3 {
        font-size: 1.1em;
    }
    
    .roadmap-item ul {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    
    .roadmap-item ul li {
        padding: 6px 10px;
        font-size: 0.85em;
    }
}

@media screen and (max-width: 480px) {
    header h1 {
        font-size: 2em;
    }

    .contact-info {
        font-size: 0.9em;
    }

    section {
        padding: 15px;
    }
    
    /* 超小屏幕优化 */
    .education-item, .experience-item {
        padding: 12px;
    }
    
    .date {
        font-size: 0.75em;
        padding: 2px 8px;
    }
    
    #portfolio li {
        padding: 12px;
    }
    
    /* 证书堆叠移动端优化 */
    .certificates-stack {
        height: auto;
        position: static;
    }
    
    .certificate-item {
        position: static;
        margin-bottom: 15px;
        transform: none !important;
    }
    
    .certificate-item:nth-child(1),
    .certificate-item:nth-child(2),
    .certificate-item:nth-child(3),
    .certificate-item:nth-child(4) {
        top: auto;
        z-index: auto;
        transform: none !important;
    }
    
    .certificate-detail {
        max-height: none;
        padding: 15px;
    }
    
    .certificate-item:hover {
        transform: none !important;
    }
    
    .certificate-item:hover .certificate-detail {
        max-height: none;
    }

    /* 头部移动端优化 */
    header h1 {
        font-size: 1.8em;
    }
    
    .contact-info {
        flex-direction: column;
        gap: 10px;
    }
}