/* ========================================
   Footer CSS - 统一底部公司信息栏
   ========================================
   布局方式：正常文档流，位于页面底部
   页面高度 = 视窗高度(100vh) + footer高度
   默认在视窗下方，向下滚动到底部时可见
   ======================================== */

/* ---- 底部信息容器 ---- */
#footer-container {
    position: relative;
    width: 100%;
    z-index: 9999;
    pointer-events: auto;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    flex-shrink: 0; /* 在 flex 布局中防止被压缩 */
}

/* ---- 统一底部栏 ---- */
.footer-unified {
    position: relative;
    width: 100%;
    background: transparent;
    color: var(--text-color, rgba(255, 255, 255, 0.65));
}

/* 顶部分割线 */
.footer-divider-line {
    width: 100%;
    height: 1px;
    background: rgba(255, 255, 255, 0.2);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    width: 100%;
    max-width: var(--max-width, 1200px);
    margin: 0;
    padding: 15px 0;
    padding-left: 5vw;
}

/* 四个系统图标 */
.footer-icons {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 18px;
}

.footer-icon {
    width: 24px;
    height: 24px;
    filter: brightness(0) invert(1) opacity(0.65);
    transition: opacity 0.3s ease;
}

.footer-icon:hover {
    opacity: 0.85;
}

/* 公司名字及备案信息 */
.footer-copyright {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    font-family: var(--font-family);
    font-size: 0.75rem !important;
    color: rgba(255, 255, 255, 0.5) !important;
    line-height: 1.2;
    letter-spacing: 0.3px;
    text-align: left;
}

.footer-copyright .footer-company,
.footer-copyright .footer-icp {
    margin: 0;
    padding: 0;
    font-family: var(--font-family) !important;
    font-size: 0.75rem !important;
    color: rgba(255, 255, 255, 0.5) !important;
    line-height: 1.2 !important;
    letter-spacing: 0.3px !important;
}

/* ---- 响应式设计 ---- */
@media (max-width: 768px) {
    .footer-content {
        gap: 10px;
        padding: 12px 0;
        padding-left: 4vw;
    }

    .footer-icons {
        gap: 16px;
    }

    .footer-icon {
        width: 18px;
        height: 18px;
    }

    .footer-copyright {
        font-size: 0.75rem;
        gap: 3px;
    }
}

@media (max-width: 480px) {
    .footer-content {
        padding: 10px 0;
        padding-left: 3vw;
    }

    .footer-copyright {
        font-size: 0.75rem;
        gap: 2px;
    }

    .footer-icons {
        gap: 14px;
    }

    .footer-icon {
        width: 16px;
        height: 16px;
    }
}