/* ===================================
   页脚样式 - 贵州山海同创数字文化传媒有限公司
   =================================== */

@import url('variables.css');

/* ========== 页脚 ========== */
footer {
    background:
        radial-gradient(circle at 15% 20%, rgba(255, 110, 199, 0.25), transparent 55%),
        radial-gradient(circle at 85% 10%, rgba(8, 247, 254, 0.18), transparent 50%),
        rgba(8, 8, 23, 0.95);
    color: var(--color-text-white);
    padding: var(--spacing-xl) var(--spacing-md);
    margin-top: var(--spacing-3xl);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(145deg, rgba(255, 110, 199, 0.08), rgba(0, 191, 255, 0.08));
    pointer-events: none;
}

.footer-container {
    max-width: var(--max-width-container);
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* ========== 页脚列 ========== */
.footer-column h3 {
    color: var(--color-text-white);
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    border-bottom: 2px solid rgba(255, 110, 199, 0.6);
    padding-bottom: var(--spacing-sm);
}

.footer-column ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-column li {
    margin-bottom: var(--spacing-sm);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.75);
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    position: relative;
}

.footer-column a::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -2px;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    transition: width var(--transition-fast);
}

.footer-column a:hover {
    color: var(--color-text-white);
    padding-left: var(--spacing-xs);
}

.footer-column a:hover::after {
    width: 100%;
}

/* ========== 公司信息列 ========== */
.footer-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-info-item {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
}

.footer-info-icon {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    flex-shrink: 0;
    margin-top: 2px;
}

.footer-info-content {
    flex: 1;
}

.footer-info-label {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 2px;
}

.footer-info-text {
    color: rgba(255, 255, 255, 0.9);
    line-height: var(--line-height-relaxed);
}

/* ========== 社交媒体 ========== */
.social-links {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-full);
    color: var(--color-text-white);
    transition: all var(--transition-fast);
    text-decoration: none;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
}

.social-link:hover {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    box-shadow: 0 20px 40px rgba(255, 110, 199, 0.35);
    transform: translateY(-4px);
}

/* ========== 页脚底部 ========== */
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.12);
    padding-top: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: var(--font-size-sm);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary);
}

/* ========== 返回顶部按钮 ========== */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 44px;
    height: 44px;
    background: var(--gradient-primary);
    color: var(--color-text-white);
    border: none;
    border-radius: var(--border-radius-full);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-fast);
    z-index: var(--z-index-fixed);
    box-shadow: 0 12px 30px rgba(255, 110, 199, 0.35);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 20px 45px rgba(0, 191, 255, 0.4);
}

/* ========== 响应式设计 ========== */
@media (max-width: 768px) {
    footer {
        padding: var(--spacing-lg) var(--spacing-md);
        margin-top: var(--spacing-xl);
    }

    .footer-content {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (max-width: 480px) {
    footer {
        padding: var(--spacing-md);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .footer-column h3 {
        font-size: var(--font-size-base);
    }

    .back-to-top {
        width: 36px;
        height: 36px;
        font-size: var(--font-size-base);
        bottom: var(--spacing-sm);
        right: var(--spacing-sm);
    }

    .social-links {
        gap: var(--spacing-sm);
    }

    .social-link {
        width: 36px;
        height: 36px;
    }
}