/* 푸터 전용 CSS - 수리나인 스타일 반응형 푸터 */

/* 푸터 기본 스타일 */
.footer_main {
    background-color: var(--ai-primary-color);
    color: var(--ai-white);
    padding: 40px 0 20px;
    margin-top: 60px;
}

.footer_main_container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 푸터 메인 영역 */
.footer_main_main {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
    margin-bottom: 30px;
}

/* 회사 정보 섹션 */
.footer_main_logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.footer_main_logo_picture {
    display: block;
    line-height: 0;
}

.footer_main_logo_img {
    width: 40px;
    height: 28px;
    object-fit: contain;
    transition: var(--ai-transition);
    filter: brightness(0) invert(1) drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.footer_main_logo_img:hover {
    transform: scale(1.05);
    filter: brightness(0) invert(1) drop-shadow(0 4px 8px rgba(0,0,0,0.3));
}

.footer_main_title {
    font-size: 24px;
    font-weight: 700;
    margin: 0;
    color: var(--ai-white);
}

.footer_company_info p {
    margin-bottom: 8px;
    color: #bdc3c7;
    font-size: 14px;
}

/* 푸터 네비게이션 섹션 */
.footer_main_section h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--ai-white);
}

.footer_main_section ul {
    list-style: none;
}

.footer_main_section ul li {
    margin-bottom: 8px;
}

.footer_main_section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    font-size: 14px;
    transition: var(--ai-transition);
}

.footer_main_section ul li a:hover {
    color: var(--ai-secondary-color);
}

/* 소셜 링크 섹션 */
.footer_social_icons {
    display: flex;
    gap: 15px;
    margin-top: 10px;
}

.footer_social_icons a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--ai-white);
    text-decoration: none;
    border-radius: 50%;
    font-weight: 600;
    transition: var(--ai-transition);
}

.footer_social_icons a:hover {
    background-color: var(--ai-secondary-color);
    transform: translateY(-2px);
}

/* 푸터 하단 */
.footer_main_bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
}

.footer_main_bottom_content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.footer_copyright {
    color: #95a5a6;
    font-size: 14px;
}

/* 반응형 브레이크포인트 */
@media (min-width: 768px) {
    .footer_main {
        padding: 50px 0 30px;
    }
    
    .footer_main_container {
        padding: 0 30px;
    }
    
    .footer_main_main {
        grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
        gap: 40px;
    }
    
    .footer_main_bottom_content {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

@media (min-width: 1024px) {
    .footer_main {
        padding: 60px 0 30px;
    }
    
    .footer_main_container {
        padding: 0 40px;
    }
}

/* ===== 모바일/태블릿 하단 네비게이션 바 ===== */

/* 기본적으로 숨김 (데스크톱에서는 표시하지 않음) */
.footer_bottom_nav {
    display: none;
}

/* 모바일/태블릿에서만 표시 (768px 이하) */
@media (max-width: 768px) {
    .footer_bottom_nav {
        display: block;
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        width: 100%;
        background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
        backdrop-filter: blur(20px);
        border-top: 1px solid rgba(0, 87, 255, 0.1);
        box-shadow: 0 -4px 20px rgba(0, 87, 255, 0.1);
        z-index: 1000;
        padding: 0;
        margin: 0;
    }
    
    .footer_bottom_nav_container {
        max-width: 100%;
        margin: 0;
        padding: 0;
    }
    
    .footer_bottom_nav_list {
        display: flex;
        justify-content: space-around;
        align-items: center;
        list-style: none;
        margin: 0;
        padding: 8px 0 12px 0;
        background: transparent;
    }
    
    .footer_bottom_nav_item {
        flex: 1;
        margin: 0;
        padding: 0;
    }
    
    .footer_bottom_nav_link {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        text-decoration: none;
        color: #6c757d;
        transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        padding: 8px 4px;
        border-radius: 12px;
        position: relative;
        min-height: 60px;
    }
    
    .footer_bottom_nav_link:hover {
        color: var(--ai-primary-color);
        background: rgba(0, 87, 255, 0.05);
        transform: translateY(-2px);
    }
    
    .footer_bottom_nav_link.active {
        color: var(--ai-primary-color);
        background: rgba(0, 87, 255, 0.1);
    }
    
    .footer_bottom_nav_link.active::before {
        content: '';
        position: absolute;
        top: -2px;
        left: 50%;
        transform: translateX(-50%);
        width: 24px;
        height: 3px;
        background: linear-gradient(90deg, var(--ai-primary-color), var(--ai-accent-color));
        border-radius: 2px;
    }
    
    .footer_bottom_nav_icon {
        font-size: 20px;
        margin-bottom: 4px;
        transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        position: relative;
    }
    
    .footer_bottom_nav_link:hover .footer_bottom_nav_icon {
        transform: scale(1.1);
    }
    
    .footer_bottom_nav_link.active .footer_bottom_nav_icon {
        transform: scale(1.15);
        color: var(--ai-primary-color);
    }
    
    .footer_bottom_nav_text {
        font-size: 14px;
        font-weight: 500;
        line-height: 1.2;
        text-align: center;
        transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    
    .footer_bottom_nav_link:hover .footer_bottom_nav_text {
        font-weight: 600;
    }
    
    .footer_bottom_nav_link.active .footer_bottom_nav_text {
        font-weight: 700;
        color: var(--ai-primary-color);
    }
    
    /* 키보드 네비게이션 스타일 */
    .footer_bottom_nav.keyboard-navigation .footer_bottom_nav_link:focus {
        outline: 2px solid var(--ai-primary-color);
        outline-offset: 2px;
        background: rgba(0, 87, 255, 0.1);
    }
    
    .footer_bottom_nav.keyboard-navigation .footer_bottom_nav_link:focus .footer_bottom_nav_icon {
        transform: scale(1.1);
    }
    
    /* 활성 상태 애니메이션 */
    .footer_bottom_nav_link.active .footer_bottom_nav_icon::after {
        content: '';
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        width: 8px;
        height: 8px;
        background: var(--ai-accent-color);
        border-radius: 50%;
        animation: pulse 2s infinite;
    }
    
    @keyframes pulse {
        0% {
            transform: translate(-50%, -50%) scale(0.8);
            opacity: 1;
        }
        50% {
            transform: translate(-50%, -50%) scale(1.2);
            opacity: 0.7;
        }
        100% {
            transform: translate(-50%, -50%) scale(0.8);
            opacity: 1;
        }
    }
    
    /* 메인 콘텐츠 하단 여백 추가 (하단 네비게이션 바 높이만큼) */
    .ai_main_content {
        padding-bottom: 80px;
    }
    
    /* 푸터 하단 여백 조정 */
    .footer_main {
        margin-bottom: 80px;
    }
}

/* 매우 작은 화면 (360px 이하) 대응 */
@media (max-width: 360px) {
    .footer_bottom_nav_text {
        font-size: 10px;
    }
    
    .footer_bottom_nav_icon {
        font-size: 18px;
    }
    
    .footer_bottom_nav_link {
        padding: 6px 2px;
        min-height: 55px;
    }
}

/* 세로 모드에서의 최적화 */
@media (max-width: 768px) and (orientation: portrait) {
    .footer_bottom_nav {
        /* iOS Safari 하단 바 대응 */
        padding-bottom: env(safe-area-inset-bottom);
    }
}

/* 가로 모드에서의 최적화 */
@media (max-width: 768px) and (orientation: landscape) {
    .footer_bottom_nav {
        padding-bottom: 4px;
    }
    
    .footer_bottom_nav_list {
        padding: 4px 0 8px 0;
    }
    
    .footer_bottom_nav_link {
        min-height: 50px;
        padding: 4px 2px;
    }
    
    .footer_bottom_nav_text {
        font-size: 10px;
    }
    
    .footer_bottom_nav_icon {
        font-size: 18px;
        margin-bottom: 2px;
    }
}