.haiwode-environmental-philosophy {
    padding-top: var(--container-gap);
    padding-bottom: var(--container-gap);
}

/* ---- 卡片列表 ---- */
.hep-card-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-top: var(--gap-80);
}

.hep-card-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 20px;
    background: #fff;
    border-radius: 10px;
    border: 1px solid #DDD;
    cursor: pointer;
    transition: all 0.3s;
    gap: 18px;
}

.hep-card-item.active {
    border: none;
    background: linear-gradient(90deg, #FC3D2D 0%, #C62417 100%);
}

.hep-card-icon {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background: var(--second-color);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.3s;
}

.hep-card-icon img {
    width: 48px;
    height: 48px;
    object-fit: contain;
    filter: brightness(0) invert(1);
    transition: filter 0.3s;
}

.hep-card-item.active .hep-card-icon {
    background: #fff;
}

.hep-card-item.active .hep-card-icon img {
    filter: brightness(0) saturate(100%) invert(19%) sepia(93%) saturate(2058%) hue-rotate(349deg) brightness(90%);
}

.hep-card-title {
    transition: color 0.3s;
    color: #003365;
    text-align: center;
    font-family: Inter;
    font-size: var(--font-20);
    font-weight: 700;
    line-height: 1.5;
}

.hep-card-item.active .hep-card-title {
    color: #fff;
}

.hep-card-desc {
    margin-top: var(--gap-20);
    transition: color 0.3s;
    color: #313131;
    font-family: Inter;
    font-size: 20px;
    font-weight: 400;
    line-height: 1.8;
}

.hep-card-item.active .hep-card-desc {
    color: #fff;
}

/* ---- 特性区 ---- */
.hep-feature {
    display: flex;
    margin-top: var(--gap-80);
    border-radius: 15px;
    background: #F8F8F8;
    overflow: hidden;
}

.hep-feature-img {
    flex-shrink: 0;
    width: calc(710 / 1600 * 100%);
    overflow: hidden;
}

.hep-feature-img img {
    width: 100%;
    max-width: 710px;
    aspect-ratio: 710 / 378;
    object-fit: cover;
    display: block;
    transition: transform 0.5s;
}

.hep-feature-img img:hover {
    transform: scale(1.05);
}

.hep-feature-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding-top: 52px;
    padding-left: 67px;
}

.hep-feature-icon {
    width: 62px;
    height: 61px;
    object-fit: contain;
}

.hep-feature-title {
    color: #313131;
    font-family: Inter;
    font-size: 36px;
    font-style: normal;
    font-weight: 700;
    line-height: normal;
}

.hep-feature-desc {
    color: #313131;
    font-family: Inter;
    font-size: 20px;
    font-style: normal;
    font-weight: 400;
    line-height: 1.8;
}

/* ---- 响应式 ---- */
@media screen and (max-width: 1500px) {
    .hep-card-item {
        gap: 16px;
    }

    .hep-card-icon {
        width: 82px;
        height: 82px;
    }

    .hep-card-icon img {
        width: 44px;
        height: 44px;
    }

    .hep-card-desc {
        font-size: 16px;
    }

    .hep-feature-content {
        padding-top: 40px;
        padding-left: 46px;
    }

    .hep-feature-title {
        font-size: 30px;
    }

    .hep-feature-desc {
        font-size: 16px;
    }

    .hep-feature-icon {
        width: 44px;
        height: 46px;
    }
}

@media screen and (max-width: 1280px) {
    .hep-card-item {
        gap: 14px;
    }

    .hep-card-icon {
        width: 76px;
        height: 76px;
    }

    .hep-card-icon img {
        width: 40px;
        height: 40px;
    }


    .hep-feature-content {
        padding-top: 40px;
        padding-left: 48px;
    }

    .hep-feature-title {
        font-size: 28px;
    }

    .hep-feature-desc {
        font-size: 14px;
    }

    .hep-feature-icon {
        width: 48px;
        height: 48px;
    }
}

@media screen and (max-width: 1200px) {
    .hep-card-item {
        gap: 12px;
    }

    .hep-card-list {
        grid-template-columns: repeat(2, 1fr);
    }

    .hep-card-icon {
        width: 72px;
        height: 72px;
    }

    .hep-card-icon img {
        width: 38px;
        height: 38px;
    }

    .hep-feature-content {
        padding-top: 32px;
        padding-left: 40px;
    }

    .hep-feature-icon {
        width: 44px;
        height: 44px;
    }
}

@media screen and (max-width: 992px) {
    .hep-card-item {
        padding: 28px 16px;
        gap: 10px;
    }

    .hep-card-icon {
        width: 66px;
        height: 66px;
    }

    .hep-card-icon img {
        width: 34px;
        height: 34px;
    }

    .hep-feature {
        flex-direction: column;
    }

    .hep-feature-img {
        width: 100%;
    }

    .hep-feature-content {
        padding: 36px 40px;
    }

    .hep-feature-title {
        font-size: 30px;
    }

    .hep-feature-desc {
        font-size: 16px;
    }

    .hep-feature-icon {
        width: 40px;
        height: 40px;
    }
}

@media screen and (max-width: 768px) {
    .hep-card-item {
        gap: 8px;
    }

    .hep-card-list {
        gap: 14px;
    }

    .hep-card-icon {
        width: 60px;
        height: 60px;
    }

    .hep-card-icon img {
        width: 30px;
        height: 30px;
    }

    .hep-feature-content {
        padding: 28px 30px;
    }

    .hep-feature-icon {
        width: 36px;
        height: 36px;
    }
}

@media screen and (max-width: 576px) {
    .hep-card-item {
        gap: 6px;
    }

    .hep-card-list {
        grid-template-columns: repeat(1, 1fr);
        gap: 12px;
    }

    .hep-card-icon {
        width: 54px;
        height: 54px;
    }

    .hep-card-icon img {
        width: 26px;
        height: 26px;
    }

    .hep-feature-content {
        padding: 20px;
    }

    .hep-feature-icon {
        width: 32px;
        height: 32px;
    }
}