:root {
    --primary-color: #00BFFF;
    --text-color: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --bg-color: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --border-color: #E0E0E0;
    --section-padding: 80px 0;
}

.about-us {
    width: 100%;
    padding: 120px 0 var(--section-padding);
    background: var(--bg-color);
}

.about-us__container {
    max-width: 1200px;
    width: 90%;
    margin: 0 auto;
}

.about-us__header {
    text-align: center;
    margin-bottom: 60px;
}

.about-us__title {
    font-size: 2.2rem;
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 15px;
    letter-spacing: 0.05em;
}

.about-us__subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

.about-us__content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 50px;
    align-items: center;
}

.about-us__text {
    padding: 0 20px;
}

.about-us__section-title {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 25px;
    letter-spacing: 0.02em;
}

.about-us__description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-us__image-wrapper {
    overflow: hidden;
    border-radius: 8px;
}

.about-us__image {
    width: 100%;
    height: auto;
    display: block;
}

.about-us__concept {
    display: flex;
    flex-direction: column;
    margin-top: 100px;
}

.about-us__concept-title-wrapper {
    text-align: center;
    margin-bottom: 50px;
}

.about-us__concept-title {
    font-size: 1.6rem;
    font-weight: bold;
    color: var(--text-color);
    letter-spacing: 0.02em;
    line-height: 1.4;
}

.about-us__concept-body {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 50px;
    align-items: center;
}

.about-us__concept-content {
    padding: 0 20px;
}

.about-us__concept-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-us__concept-image-wrapper {
    overflow: hidden;
    border-radius: 8px;
}

.about-us__concept-image {
    width: 100%;
    height: auto;
    display: block;
}

.about-us__global {
    display: flex;
    flex-direction: column;
    margin-top: 100px;
}

.about-us__global-title-wrapper {
    text-align: center;
    margin-bottom: 50px;
}

.about-us__global-title {
    font-size: 1.6rem;
    font-weight: bold;
    color: var(--text-color);
    letter-spacing: 0.02em;
    line-height: 1.4;
}

.about-us__global-body {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 50px;
    align-items: center;
}

.about-us__global-content {
    padding: 0 20px;
}

.about-us__global-description {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-us__global-image-wrapper {
    overflow: hidden;
    border-radius: 8px;
}

.about-us__global-image {
    width: 100%;
    height: auto;
    display: block;
}

.about-us__standfor {
    margin-top: 100px;
    padding: 60px 0;
}

/* 伪元素撑满浏览器全屏宽度 */
.about-us__standfor::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  width: 100vw;
  height: 100%;
  background-color: #F0F4F7;
  z-index: -1;
}

.about-us__standfor-title-wrapper {
    text-align: center;
    margin-bottom: 50px;
}

.about-us__standfor-title {
    font-size: 1.6rem;
    font-weight: bold;
    color: var(--text-color);
    letter-spacing: 0.02em;
    line-height: 1.4;
}

.about-us__standfor-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    max-width: 800px;
    margin: 0 auto 40px;
}

.about-us__standfor-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.about-us__standfor-check {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.about-us__standfor-text {
    font-size: 0.95rem;
    color: black;
}

.about-us__standfor-text:hover {
    font-size: 0.95rem;
    color: #3FBEDFFF;
}


.about-us__standfor-description {
    text-align: center;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 600px;
    margin: 0 auto;
}

.about-us__core-values {
    margin-top: 80px;
}

.about-us__core-values-header {
    text-align: center;
    margin-bottom: 50px;
}

.about-us__core-values-title {
    font-size: 1.6rem;
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 15px;
    letter-spacing: 0.02em;
    line-height: 1.4;
}

.about-us__core-values-subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.about-us__core-values-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.about-us__core-values-card {
    background: #FFFFFF;
    border-radius: 12px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.about-us__core-values-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.about-us__core-values-icon-wrapper {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: #E0F4FF;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-us__core-values-icon {
    width: 30px;
    height: 30px;
}

.about-us__core-values-card-title {
    font-size: 0.95rem;
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 12px;
    letter-spacing: 0.01em;
}

.about-us__core-values-card-description {
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

@media screen and (max-width: 1200px) {
    .about-us__content {
        gap: 40px;
    }

    .about-us__title {
        font-size: 2rem;
    }

    .about-us__concept {
        margin-top: 80px;
    }

    .about-us__concept-title {
        font-size: 1.4rem;
    }

    .about-us__concept-body {
        gap: 40px;
    }

    .about-us__global {
        margin-top: 80px;
    }

    .about-us__global-title {
        font-size: 1.4rem;
    }

    .about-us__global-body {
        gap: 40px;
    }

    .about-us__standfor {
        margin-top: 80px;
        padding: 50px 0;
    }

    .about-us__standfor-title {
        font-size: 1.4rem;
    }

    .about-us__core-values {
        margin-top: 70px;
    }

    .about-us__core-values-title {
        font-size: 1.4rem;
    }

    .about-us__core-values-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 25px;
    }
}

@media screen and (max-width: 992px) {
    .about-us {
        padding: 100px 0 var(--section-padding);
    }

    .about-us__content {
        grid-template-columns: 1fr;
        gap: 35px;
    }

    .about-us__text {
        padding: 0;
        order: 2;
    }

    .about-us__image-wrapper {
        order: 1;
    }

    .about-us__title {
        font-size: 1.8rem;
    }

    .about-us__section-title {
        font-size: 1.3rem;
    }

    .about-us__description {
        font-size: 0.9rem;
    }

    .about-us__concept {
        margin-top: 70px;
    }

    .about-us__concept-body {
        grid-template-columns: 1fr;
        gap: 35px;
    }

    .about-us__concept-content {
        padding: 0;
        order: 2;
    }

    .about-us__concept-image-wrapper {
        order: 1;
    }

    .about-us__concept-title {
        font-size: 1.3rem;
    }

    .about-us__concept-description {
        font-size: 0.9rem;
    }

    .about-us__global {
        margin-top: 70px;
    }

    .about-us__global-body {
        grid-template-columns: 1fr;
        gap: 35px;
    }

    .about-us__global-content {
        padding: 0;
        order: 2;
    }

    .about-us__global-image-wrapper {
        order: 1;
    }

    .about-us__global-title {
        font-size: 1.3rem;
    }

    .about-us__global-description {
        font-size: 0.9rem;
    }

    .about-us__standfor {
        margin-top: 70px;
        padding: 40px 0;
    }

    .about-us__standfor-title {
        font-size: 1.3rem;
    }

    .about-us__standfor-list {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .about-us__standfor-text {
        font-size: 0.9rem;
    }

    .about-us__standfor-description {
        font-size: 0.9rem;
    }

    .about-us__core-values {
        margin-top: 60px;
    }

    .about-us__core-values-title {
        font-size: 1.3rem;
    }

    .about-us__core-values-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .about-us__core-values-card {
        padding: 25px;
    }

    .about-us__core-values-icon-wrapper {
        width: 55px;
        height: 55px;
        margin-bottom: 15px;
    }

    .about-us__core-values-icon {
        width: 28px;
        height: 28px;
    }

    .about-us__core-values-card-title {
        font-size: 0.9rem;
    }

    .about-us__core-values-card-description {
        font-size: 0.78rem;
    }
}

@media screen and (max-width: 768px) {
    .about-us {
        padding: 80px 0 var(--section-padding);
    }

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

    .about-us__title {
        font-size: 1.5rem;
    }

    .about-us__subtitle {
        font-size: 0.9rem;
    }

    .about-us__content {
        gap: 30px;
    }

    .about-us__section-title {
        font-size: 1.2rem;
        margin-bottom: 20px;
    }

    .about-us__description {
        font-size: 0.85rem;
    }

    .about-us__concept {
        margin-top: 60px;
    }

    .about-us__concept-title {
        font-size: 1.15rem;
    }

    .about-us__concept-description {
        font-size: 0.85rem;
    }

    .about-us__global {
        margin-top: 60px;
    }

    .about-us__global-title {
        font-size: 1.15rem;
    }

    .about-us__global-description {
        font-size: 0.85rem;
    }

    .about-us__standfor {
        margin-top: 60px;
        padding: 35px 0;
    }

    .about-us__standfor-title {
        font-size: 1.15rem;
    }

    .about-us__standfor-text {
        font-size: 0.85rem;
    }

    .about-us__standfor-description {
        font-size: 0.85rem;
    }

    .about-us__core-values {
        margin-top: 50px;
    }

    .about-us__core-values-title {
        font-size: 1.15rem;
    }

    .about-us__core-values-cards {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .about-us__core-values-card {
        padding: 22px;
    }

    .about-us__core-values-icon-wrapper {
        width: 50px;
        height: 50px;
        margin-bottom: 12px;
    }

    .about-us__core-values-icon {
        width: 25px;
        height: 25px;
    }

    .about-us__core-values-card-title {
        font-size: 0.85rem;
    }

    .about-us__core-values-card-description {
        font-size: 0.75rem;
    }
}

@media screen and (max-width: 480px) {
    .about-us {
        padding: 60px 0 60px;
    }

    .about-us__header {
        margin-bottom: 40px;
    }

    .about-us__title {
        font-size: 1.3rem;
    }

    .about-us__subtitle {
        font-size: 0.85rem;
    }

    .about-us__content {
        gap: 25px;
    }

    .about-us__section-title {
        font-size: 1.1rem;
        margin-bottom: 18px;
    }

    .about-us__description {
        font-size: 0.82rem;
    }

    .about-us__concept {
        margin-top: 50px;
    }

    .about-us__concept-title {
        font-size: 1.05rem;
    }

    .about-us__concept-description {
        font-size: 0.82rem;
    }

    .about-us__global {
        margin-top: 50px;
    }

    .about-us__global-title {
        font-size: 1.05rem;
    }

    .about-us__global-description {
        font-size: 0.82rem;
    }

    .about-us__standfor {
        margin-top: 50px;
        padding: 30px 0;
    }

    .about-us__standfor-title {
        font-size: 1.05rem;
    }

    .about-us__standfor-text {
        font-size: 0.82rem;
    }

    .about-us__standfor-description {
        font-size: 0.82rem;
    }

    .about-us__core-values {
        margin-top: 40px;
    }

    .about-us__core-values-title {
        font-size: 1.05rem;
    }

    .about-us__core-values-cards {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .about-us__core-values-card {
        padding: 20px;
    }

    .about-us__core-values-icon-wrapper {
        width: 45px;
        height: 45px;
        margin-bottom: 10px;
    }

    .about-us__core-values-icon {
        width: 22px;
        height: 22px;
    }

    .about-us__core-values-card-title {
        font-size: 0.82rem;
    }

    .about-us__core-values-card-description {
        font-size: 0.72rem;
    }
}