.attend-section {
    padding: 60px 0;
    background: #f8f9fa;
}
.tar-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 30px;
    text-align: center;
}
.section-title {
    font-size: 34px;
    color: #002060;
    display: inline-block;
    margin-bottom: 20px;
    font-weight: 700;
}
.section-intro {
    max-width: 920px;
    margin: 0 auto 45px;
    text-align: center;
    line-height: 1.7;
    color: #444444;
    font-size: 15px;
}

.tab-nav {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 35px;
}
.tab-btn {
    padding: 11px 30px;
    border: 2px solid #003399;
    background: #fff;
    color: #003399;
    border-radius: 50px;
    font-size: 16px;
    cursor: pointer;
    transition: 0.3s;
    white-space: nowrap;
}
.tab-btn.active,
.tab-btn:hover {
    background: #003399;
    color: #fff;
}

.tab-panel {
    display: none;
}
.tab-panel.active {
    display: block;
}

.attend-list {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 18px;
    text-align: left;
}
.attend-item {
    background: #fff;
    padding: 14px 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

/* ========== 平板 768px 适配 ========== */
@media screen and (max-width: 768px) {
    .attend-section {
        padding: 40px 0;
    }
    .tar-container {
        padding: 0 20px;
    }
    .section-title {
        font-size: 26px;
    }
    .section-intro {
        margin-bottom: 30px;
        font-size: 14px;
    }
    .tab-nav {
        gap: 12px;
        margin-bottom: 25px;
    }
    .tab-btn {
        padding: 9px 22px;
        font-size: 15px;
    }
    /* 平板双列卡片 */
    .attend-list {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
}

/* ========== 手机 480px 核心响应式修复 ========== */
@media screen and (max-width: 480px) {
    .attend-section {
        padding: 30px 0;
    }
    .tar-container {
        padding: 0 16px;
    }
    .section-title {
        font-size: 22px;
        margin-bottom: 12px;
    }
    .section-intro {
        font-size: 13px;
        margin-bottom: 22px;
        line-height: 1.6;
    }
    /* 标签栏自动换行，自适应屏幕宽度 */
    .tab-nav {
        flex-wrap: wrap;
        row-gap: 10px;
        column-gap: 10px;
    }
    .tab-btn {
        flex: 1;
        min-width: 120px;
        padding: 8px 10px;
        font-size: 14px;
    }
    /* 手机单列卡片，铺满屏幕，不拥挤 */
    .attend-list {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .attend-item {
        padding: 12px 16px;
    }
}