/* ====== 页脚样式 - 赤壁流金风格 ====== */

.footer {
    background: linear-gradient(180deg, var(--bg-main) 0%, var(--color-primary) 50%, var(--color-primary) 100%);
    color: var(--color-gold);
    border-top: 3px solid var(--color-gold);
    padding: 40px 20px 24px;
    margin-top: auto;
    position: relative;
}

/* ---- 四列导航宫格 ---- */
.footer-nav {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto 28px;
}

.footer-col h4 {
    color: var(--color-gold);
    font-family: var(--font-brush);
    font-size: 18px;
    font-weight: normal;
    border-bottom: 1px solid var(--border-gold);
    padding-bottom: 8px;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.footer-col a {
    display: block;
    color: var(--text-secondary);
    line-height: 2;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.25s, padding-left 0.25s;
}

.footer-col a:hover {
    color: var(--color-gold);
    padding-left: 6px;
}

/* ---- 站点数据统计 ---- */
.footer-stats {
    display: flex;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    max-width: 1200px;
    margin: 0 auto 20px;
    padding: 12px 16px;
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
}

.footer-stats span {
    color: var(--text-secondary);
    font-size: 13px;
    letter-spacing: 1px;
}

/* ---- 底部信息栏 ---- */
.footer-bottom {
    text-align: center;
    padding-top: 16px;
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 13px;
    letter-spacing: 1px;
    line-height: 1.8;
}

.footer-poem {
    font-family: var(--font-kai) !important;
    font-style: italic;
    color: var(--color-gold) !important;
    opacity: 0.7;
    margin-top: 10px;
    font-size: 14px !important;
}

/* ---- 返回顶部按钮 ---- */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: var(--color-gold);
    border: 2px solid var(--color-gold);
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: none; /* 默认隐藏，JS 控制显示 */
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.4);
    transition: transform 0.3s, box-shadow 0.3s, background 0.3s;
    z-index: 999;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(212, 175, 55, 0.35);
    background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
}

.back-to-top:active {
    transform: translateY(-1px);
}

/* ---- 移动端适配 ---- */
@media (max-width: 768px) {
    .footer-nav {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .footer-stats {
        gap: 12px;
        font-size: 12px;
    }

    .footer-stats span {
        font-size: 11px;
    }

    .back-to-top {
        bottom: 18px;
        right: 18px;
        width: 38px;
        height: 38px;
        font-size: 17px;
    }
}

@media (max-width: 480px) {
    .footer {
        padding: 28px 14px 20px;
    }

    .footer-col h4 {
        font-size: 15px;
    }

    .footer-col a {
        font-size: 13px;
    }
}