/* =====================================================
   footer.css — 页脚栏 (Windows 7 Aero Glass)
   ===================================================== */

/* ---------- 页脚容器 ---------- */
.aero-footer {
    background: rgba(10, 10, 25, 0.92);
    backdrop-filter: blur(16px) saturate(160%);
    -webkit-backdrop-filter: blur(16px) saturate(160%);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding: 40px 24px 0;
    margin-top: 40px;
    position: relative;
}

.aero-footer__inner {
    max-width: 1200px;
    margin: 0 auto;
}

/* ---------- 页头区域 ---------- */
.aero-footer__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 20px;
}

.aero-footer__brand {
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 0.5px;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
}

.aero-footer__contacts {
    display: flex;
    align-items: center;
    gap: 16px;
}

.aero-footer__contact-link {
    display: flex;
    align-items: center;
    gap: 6px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
    text-decoration: none;
    transition: color 0.2s ease;
}

.aero-footer__contact-link:hover {
    color: rgba(255, 255, 255, 0.8);
}

.aero-footer__contact-link img {
    width: 18px;
    height: 18px;
    display: block;
    opacity: 0.5;
    transition: opacity 0.2s ease;
}

.aero-footer__contact-link:hover img {
    opacity: 0.8;
}

/* ---------- 分隔线 ---------- */
.aero-footer__divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.08), transparent);
    margin: 0;
}

/* ---------- 栏目区域 ---------- */
.aero-footer__columns {
    display: flex;
    gap: 16px;
    padding: 28px 0;
}

.aero-footer__col {
    flex: 1;
    min-width: 0;
}

.aero-footer__col-title {
    font-size: 13px;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.6);
    letter-spacing: 0.8px;
    text-transform: uppercase;
    margin-bottom: 14px;
}

.aero-footer__col-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.aero-footer__col-link {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
    text-decoration: none;
    transition: color 0.2s ease;
    display: inline-block;
}

.aero-footer__col-link:hover {
    color: rgba(255, 255, 255, 0.8);
}

/* 无标题栏目特殊处理 */
.aero-footer__col--no-title {
    padding-top: 0;
}

.aero-footer__col--no-title .aero-footer__col-list {
    padding-top: 0;
}

/* ---------- 版权信息区域 ---------- */
.aero-footer__copyright {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 32px;
    padding: 24px 0 20px;
}

.aero-footer__copyright-text {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.3);
    line-height: 1.7;
    flex: 1;
    max-width: 900px;
}

/* 返回顶部按钮 */
.aero-footer__back-top {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.04);
    cursor: pointer;
    transition: all 0.2s ease;
    color: rgba(255, 255, 255, 0.4);
    font-size: 18px;
    text-decoration: none;
    margin-top: 4px;
}

.aero-footer__back-top:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
    color: #fff;
    transform: translateY(-2px);
}

.aero-footer__back-top:active {
    transform: translateY(0);
}

/* ---------- 底部链接区域 ---------- */
.aero-footer__bottom {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 16px 0 28px;
}

.aero-footer__bottom-link {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.3);
    text-decoration: none;
    transition: color 0.2s ease;
}

.aero-footer__bottom-link:hover {
    color: rgba(255, 255, 255, 0.7);
}

.aero-footer__bottom-divider {
    width: 1px;
    height: 12px;
    background: rgba(255, 255, 255, 0.1);
}

/* =====================================================
   响应式
   ===================================================== */

@media (max-width: 900px) {
    .aero-footer__columns {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 20px 16px;
    }
}

@media (max-width: 680px) {
    .aero-footer {
        padding: 28px 16px 0;
    }

    .aero-footer__header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .aero-footer__columns {
        grid-template-columns: repeat(2, 1fr);
    }

    .aero-footer__copyright {
        flex-direction: column;
        gap: 16px;
    }

    .aero-footer__back-top {
        align-self: flex-end;
        width: 36px;
        height: 36px;
        font-size: 16px;
    }

    .aero-footer__bottom {
        flex-wrap: wrap;
        gap: 12px 16px;
    }

    .aero-footer__bottom-divider {
        display: none;
    }
}

@media (max-width: 480px) {
    .aero-footer__columns {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }

    .aero-footer__brand {
        font-size: 15px;
    }

    .aero-footer__copyright-text {
        font-size: 10px;
    }
}