/* Footer */
.footer {
    background: #e9edf3;
    padding: 48px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 44px;
    margin-bottom: 36px;
}

.footer-logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--brand);
    margin-bottom: 14px;
}

.footer-desc {
    font-size: 13px;
    color: var(--text-3);
    line-height: 1.9;
    max-width: 360px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-1);
    margin-bottom: 18px;
}

.footer-col a {
    display: block;
    font-size: 13px;
    color: var(--text-3);
    margin-bottom: 12px;
    transition: color 0.2s ease;
}

    .footer-col a:hover {
        color: var(--brand);
    }

.footer-social {
    display: flex;
    gap: 12px;
    margin-top: 10px;
}

    .footer-social span {
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background: var(--surface);
        border: 1px solid var(--border);
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        color: var(--text-3);
        transition: all 0.2s ease;
    }

        .footer-social span:hover {
            border-color: var(--brand);
            color: var(--brand);
            box-shadow: var(--shadow-sm);
        }

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-4);
}

.footer-bottom-links {
    display: flex;
    gap: 22px;
}

    .footer-bottom-links a {
        color: var(--text-4);
        transition: color 0.2s ease;
    }

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

/* ===== 移动端适配 ===== */
@media (max-width: 768px) {
    .footer {
        padding: 32px 0 20px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
        margin-bottom: 24px;
    }
    .footer-desc {
        max-width: 100%;
    }
    .footer-bottom {
        flex-direction: column;
        gap: 10px;
        align-items: flex-start;
        font-size: 11px;
    }
    .footer-bottom-links {
        gap: 14px;
    }
    .footer-bottom-links a {
        font-size: 11px;
    }
}

@media (max-width: 480px) {
    .footer {
        padding: 24px 0 16px;
    }
    .footer-logo {
        font-size: 17px;
        margin-bottom: 10px;
    }
    .footer-desc {
        font-size: 12px;
        line-height: 1.7;
    }
}