.top-navigation {
    margin-bottom: 60px;
    text-align: left;
    animation: fadeIn 0.8s ease-out;
}

.back-link {
    color: #1d1d1f;
    text-decoration: none;
    font-size: 17px;
    font-weight: 400;
    transition: color 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: inline-block;
}

.back-link:hover {
    color: #86868b;
}

.about-header {
    text-align: center;
    margin-bottom: 80px;
    animation: fadeIn 1s ease-out 0.2s both;
}

.about-avatar {
    margin-bottom: 30px;
}

.about-avatar img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), box-shadow 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.about-avatar img:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
}

.about-title {
    font-family: 'Againts', -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 56px;
    font-weight: 80;
    color: #1d1d1f;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
    line-height: 1.05;
}

.about-subtitle {
    font-size: 21px;
    color: #86868b;
    font-weight: 400;
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: left;
    animation: fadeIn 1s ease-out 0.4s both;
}

.about-section {
    margin-bottom: 80px;
}

.section-title {
    font-size: 32px;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 24px;
    letter-spacing: -0.01em;
    line-height: 1.125;
}

.section-text {
    font-size: 19px;
    color: #1d1d1f;
    line-height: 1.47059;
    font-weight: 400;
}

.cert-category {
    margin-bottom: 40px;
}

.cert-category:last-child {
    margin-bottom: 0;
}

.category-title {
    font-size: 20px;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.cert-item {
    padding: 16px 20px;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 12px;
    font-size: 15px;
    color: #1d1d1f;
    font-weight: 400;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    line-height: 1.47059;
}

.cert-item:hover {
    background: #f5f5f7;
    border-color: rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.award-category {
    margin-bottom: 40px;
}

.award-category:last-child {
    margin-bottom: 0;
}

.awards-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.award-item {
    display: flex;
    gap: 24px;
    padding: 20px;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    align-items: center;
}

.award-item:hover {
    background: #f5f5f7;
    border-color: rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.award-year {
    font-size: 17px;
    font-weight: 600;
    color: #1d1d1f;
    min-width: 60px;
    flex-shrink: 0;
    line-height: 1.47059;
}

.award-content {
    flex: 1;
}

.award-name {
    font-size: 17px;
    color: #1d1d1f;
    line-height: 1.47059;
    font-weight: 400;
}

.award-right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.award-level {
    font-size: 15px;
    color: #86868b;
    font-weight: 400;
    line-height: 1.47059;
    white-space: nowrap;
}

.award-info {
    font-size: 15px;
    color: #1d1d1f;
    font-weight: 500;
    padding: 8px 16px;
    background: #f5f5f7;
    border-radius: 20px;
    white-space: nowrap;
    line-height: 1.47059;
}

.experience-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.experience-item {
    display: flex;
    gap: 24px;
    padding: 20px;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    align-items: center;
}

.experience-item:hover {
    background: #f5f5f7;
    border-color: rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.experience-date {
    font-size: 17px;
    font-weight: 600;
    color: #1d1d1f;
    min-width: 180px;
    flex-shrink: 0;
    line-height: 1.47059;
}

.experience-content {
    flex: 1;
}

.experience-company {
    font-size: 17px;
    color: #1d1d1f;
    margin-bottom: 6px;
    line-height: 1.47059;
    font-weight: 500;
}

.experience-position {
    font-size: 15px;
    color: #86868b;
    font-weight: 400;
    line-height: 1.47059;
}

.honors-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.honor-item {
    display: flex;
    gap: 24px;
    padding: 20px;
    background: #fff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    border-radius: 12px;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.honor-item:hover {
    background: #f5f5f7;
    border-color: rgba(0, 0, 0, 0.1);
    transform: translateY(-2px);
}

.honor-year {
    font-size: 17px;
    font-weight: 600;
    color: #1d1d1f;
    min-width: 100px;
    flex-shrink: 0;
    line-height: 1.47059;
}

.honor-name {
    font-size: 17px;
    color: #1d1d1f;
    line-height: 1.47059;
    font-weight: 400;
    flex: 1;
}

.projects-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.project-item {
    padding: 24px;
    background: #fff;
    border-radius: 18px;
    border: 1px solid rgba(0, 0, 0, 0.06);
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94), box-shadow 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.project-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.project-name {
    font-size: 24px;
    font-weight: 600;
    color: #1d1d1f;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
    line-height: 1.16667;
}

.project-desc {
    font-size: 17px;
    color: #86868b;
    line-height: 1.47059;
    margin-bottom: 12px;
    font-weight: 400;
}

.project-link {
    color: #1d1d1f;
    text-decoration: none;
    font-size: 17px;
    font-weight: 400;
    transition: color 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.project-link:hover {
    color: #86868b;
}

.contact-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: 1px solid rgba(0, 0, 0, 0.1);
    background: #fff;
    border-radius: 20px;
    color: #1d1d1f;
    text-decoration: none;
    font-size: 17px;
    font-weight: 400;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.contact-link:hover {
    background: #f5f5f7;
    border-color: rgba(0, 0, 0, 0.15);
    transform: translateY(-1px);
}

.contact-link svg {
    flex-shrink: 0;
}

@media (max-width: 1068px) {
    .about-title {
        font-size: 48px;
    }

    .section-title {
        font-size: 28px;
    }

    .certifications-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }

    .cert-category {
        margin-bottom: 32px;
    }

    .category-title {
        font-size: 18px;
    }
}

@media (max-width: 768px) {
    #main-container {
        padding: 80px 20px 40px;
    }

    .about-header {
        margin-bottom: 60px;
    }

    .about-avatar img {
        width: 150px;
        height: 150px;
    }

    .about-title {
        font-size: 40px;
    }

    .about-subtitle {
        font-size: 19px;
    }

    .about-section {
        margin-bottom: 50px;
    }

    .section-title {
        font-size: 24px;
        margin-bottom: 20px;
    }

    .section-text {
        font-size: 17px;
    }

    .certifications-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .cert-category {
        margin-bottom: 28px;
    }

    .category-title {
        font-size: 17px;
        margin-bottom: 12px;
    }

    .cert-item {
        padding: 14px 18px;
        font-size: 14px;
    }

    .award-category {
        margin-bottom: 32px;
    }

    .experience-item {
        flex-direction: column;
        gap: 12px;
        padding: 16px;
        align-items: flex-start;
    }

    .experience-date {
        min-width: auto;
        font-size: 16px;
    }

    .experience-company {
        font-size: 16px;
    }

    .experience-position {
        font-size: 14px;
    }

    .award-item {
        flex-direction: column;
        gap: 12px;
        padding: 16px;
        align-items: flex-start;
    }

    .award-year {
        min-width: auto;
        font-size: 16px;
    }

    .award-content {
        width: 100%;
    }

    .award-name {
        font-size: 16px;
    }

    .award-right {
        width: 100%;
        justify-content: flex-end;
        gap: 10px;
    }

    .award-level {
        font-size: 14px;
    }

    .award-info {
        font-size: 14px;
        padding: 6px 14px;
    }

    .honor-item {
        flex-direction: column;
        gap: 12px;
        padding: 16px;
    }

    .honor-year {
        min-width: auto;
        font-size: 16px;
    }

    .honor-name {
        font-size: 16px;
    }

    .project-item {
        padding: 20px;
    }

    .project-name {
        font-size: 22px;
    }

    .project-desc {
        font-size: 16px;
    }

    .contact-links {
        flex-direction: column;
    }

    .contact-link {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    #main-container {
        padding: 60px 16px 30px;
    }

    .about-title {
        font-size: 32px;
    }

    .about-subtitle {
        font-size: 17px;
    }

    .section-title {
        font-size: 22px;
    }

    .section-text {
        font-size: 16px;
    }

    .cert-item {
        padding: 12px 16px;
        font-size: 13px;
    }

    .award-item,
    .honor-item {
        padding: 14px;
    }

    .award-year,
    .honor-year {
        font-size: 15px;
    }

    .award-name,
    .honor-name {
        font-size: 15px;
    }
}

@media (prefers-color-scheme: dark) {
    .back-link {
        color: #f5f5f7;
    }

    .back-link:hover {
        color: #86868b;
    }

    .about-title {
        color: #f5f5f7;
    }

    .about-subtitle {
        color: #86868b;
    }

    .section-title {
        color: #f5f5f7;
    }

    .section-text {
        color: #f5f5f7;
    }

    .category-title {
        color: #f5f5f7;
    }

    .award-category .category-title {
        color: #f5f5f7;
    }

    .cert-item {
        background: #1d1d1f;
        border-color: rgba(255, 255, 255, 0.1);
        color: #f5f5f7;
    }

    .cert-item:hover {
        background: #2d2d2f;
        border-color: rgba(255, 255, 255, 0.15);
    }

    .award-item,
    .honor-item {
        background: #1d1d1f;
        border-color: rgba(255, 255, 255, 0.1);
    }

    .award-item:hover,
    .honor-item:hover {
        background: #2d2d2f;
        border-color: rgba(255, 255, 255, 0.15);
    }

    .award-year,
    .honor-year {
        color: #f5f5f7;
    }

    .award-name,
    .honor-name {
        color: #f5f5f7;
    }

    .award-level {
        color: #86868b;
    }

    .award-info {
        background: #2d2d2f;
        color: #f5f5f7;
    }

    .experience-item {
        background: #1d1d1f;
        border-color: rgba(255, 255, 255, 0.1);
    }

    .experience-item:hover {
        background: #2d2d2f;
        border-color: rgba(255, 255, 255, 0.15);
    }

    .experience-date {
        color: #f5f5f7;
    }

    .experience-company {
        color: #f5f5f7;
    }

    .experience-position {
        color: #86868b;
    }

    .project-item {
        background: #1d1d1f;
        border-color: rgba(255, 255, 255, 0.1);
    }

    .project-name {
        color: #f5f5f7;
    }

    .project-desc {
        color: #86868b;
    }

    .project-link {
        color: #f5f5f7;
    }

    .project-link:hover {
        color: #86868b;
    }

    .contact-link {
        background: #1d1d1f;
        border-color: rgba(255, 255, 255, 0.1);
        color: #f5f5f7;
    }

    .contact-link:hover {
        background: #2d2d2f;
        border-color: rgba(255, 255, 255, 0.15);
    }
}