/* 全局重置 */

/* 页面容器（文字宽度1200px，大气） */
.about-page {
    max-width: 1200px;
    margin: 0 auto;
    background-color: #fff;
}

/* 导航栏样式 */
.about-nav {
    width: 100%;
    height: auto;
    line-height: 1;
    padding: 45px 0;
    background: #ffffff;
    border-bottom: 1px solid #f0f0f0;
    text-align: center;
}
.about-nav__item {
    display: inline-block;
    padding: 0 16px;
    font-size: 18px;
    font-weight: 500;
    letter-spacing: 1px;
    color: #444;
    text-decoration: none;
    position: relative;
}
.about-nav__item::after {
    content: "|";
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    color: #d8d8d8;
    font-weight: 300;
}
.about-nav__item:last-child::after {
    display: none;
}
.about-nav__item--active {
    color: #960000;
    font-weight: 600;
}

/* 手机端导航 */
@media (max-width: 768px) {
    .about-nav {
        display: grid !important;
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 10px !important;
        padding: 25px 15px !important;
        background: #fff !important;
        border-bottom: 1px solid #f0f0f0 !important;
    }
    .about-nav__item {
        display: block !important;
        padding: 14px 10px !important;
        font-size: 15px !important;
        font-weight: 500 !important;
        text-align: center !important;
        color: #333 !important;
        background-color: #f8f8f8 !important;
        border: 1px solid #e5e5e5 !important;
        border-radius: 8px !important;
        transition: all 0.2s ease !important;
        margin: 0 !important;
    }
    .about-nav__item--active {
        background-color: #fff0f0 !important;
        border-color: #960000 !important;
        color: #960000 !important;
        font-weight: 600 !important;
    }
    .about-nav__item:active {
        background-color: #eaeaea !important;
        transform: scale(0.98) !important;
    }
    .about-nav__item::after {
        display: none !important;
    }
}

/* ====================== */
/* 关键修复：图片 100% 保持原大小，不拉伸！ */
/* ====================== */
.about-banner {
    width: 100%;
    height: auto !important; /* 高度自适应图片 */
    position: relative;
    overflow: hidden;
    text-align: center;
}
.about-banner__img {
    width: auto !important;    /* 禁止拉伸 */
    height: auto !important;   /* 保持原图比例 */
    max-width: 100% !important;/* 手机端不超出屏幕 */
    display: block !important;
    margin: 0 auto !important; /* 居中 */
}

/* 以下完全不变 */
.about-banner__play {
    position: absolute;
    top: 50%;
    left: 45%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background-color: rgba(0,0,0,0.5);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
.about-banner__play::after {
    content: "";
    border-left: 12px solid #fff;
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
}
.about-banner__text {
    position: absolute;
    top: 50%;
    left: 55%;
    transform: translateY(-50%);
    color: #fff;
}
.about-banner__text small {
    font-size: 20px;
    display: block;
    margin-bottom: 8px;
}
.about-banner__text h2 {
    font-size: 42px;
    line-height: 1.2;
}

/* 内容区域 */
.about-content {
    padding: 60px 80px;
    color: #333;
}
.about-content__title {
    font-size: 28px;
    font-weight: normal;
    text-align: center;
    margin-bottom: 30px;
}
.about-content__desc {
    font-size: 18px;
    line-height: 1.8;
    margin-bottom: 20px;
}

/* 卡片区域 完全不变！ */
.about_an_container {
    width: 950px;
    margin: 0 auto;
    padding: 20px 0;
    background-color: #fff;
}
.about_an_card_wrap {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}
.about_an_card {
    border-radius: 24px;
    height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    color: #fff;
    cursor: pointer;
    transition: all 0.4s ease;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    text-decoration: none;
}
.about_an_card.card1 { background-image: url("../img/about_k_1.jpg"); }
.about_an_card.card2 { background-image: url("../img/about_k_2.jpg"); }
.about_an_card.card3 { background-image: url("../img/about_k_3.jpg"); }
.about_an_card.card4 { background-image: url("../img/about_k_4.jpg"); }
.about_an_card-title {
    font-size: 48px;
    font-weight: 700;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.6);
    text-align: center;
}
.about_an_card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
}
.about_an_card:active {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
}

/* 手机端 */
@media (max-width: 768px) {
    .about-banner {
        height: auto !important;
    }
    .about_an_container {
        width: 100% !important;
        padding: 10px !important;
    }
    .about_an_card_wrap {
        grid-template-columns: repeat(2, 1fr) !important;
    }
    .about_an_card {
        height: 160px !important;
    }
    .about_an_card-title {
        font-size: 28px !important;
    }
    .about-content {
        padding: 40px 20px !important;
    }
}