/* =============== EXPERTISE PAGE STYLES =============== */

/* Floating Side Navigation */
.floating-nav {
    position: fixed;
    left: 2rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1000;
    transition: var(--transition);
}

.floating-nav__menu {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(44, 62, 103, 0.1);
}

.floating-nav__item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background-color: transparent;
    border: none;
    border-left: 3px solid transparent;
    color: var(--text-color);
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    white-space: nowrap;
    text-decoration: none;
    font-family: 'Noto Sans KR', sans-serif;
}

.floating-nav__item i {
    font-size: 1.1rem;
    color: var(--accent-color);
    transition: var(--transition);
    width: 20px;
    text-align: center;
}

.floating-nav__item span {
    transition: var(--transition);
}

.floating-nav__item:hover {
    background-color: rgba(135, 206, 235, 0.1);
    border-left-color: var(--sky-blue);
    transform: translateX(5px);
}

.floating-nav__item:hover i {
    color: var(--sky-blue);
}

.floating-nav__item:hover span {
    color: var(--sky-blue);
}

.floating-nav__item.active {
    background-color: rgba(44, 62, 103, 0.05);
    border-left-color: var(--accent-color);
    font-weight: 600;
}

.floating-nav__item.active i {
    color: var(--accent-color);
}

.floating-nav__item.active span {
    color: var(--accent-color);
}

/* Hide on mobile */
@media screen and (max-width: 968px) {
    .floating-nav {
        display: none;
    }
}

/* Page Hero */
.page-hero {
    background: var(--primary-color);
    color: var(--text-white);
    padding: 8rem 0 5rem;
    margin-top: var(--header-height);
    text-align: center;
}

.page-hero__title {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
    color: var(--text-white);
    animation: fadeInUp 0.8s ease-out;
}

.page-hero__subtitle {
    font-size: 1.5rem;
    font-weight: 300;
    opacity: 0.9;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

/* =============== ANCHOR NAVIGATION =============== */
.anchor-nav-section {
    background-color: var(--bg-white);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: var(--header-height);
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.tab-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.tab-btn {
    background-color: var(--bg-white);
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    padding: 1rem 2.5rem;
    border-radius: var(--border-radius);
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.tab-btn i {
    font-size: 1.25rem;
}

.tab-btn.active,
.tab-btn:active,
.tab-btn:focus {
    background-color: var(--accent-color);
    color: var(--text-white);
    border-color: var(--accent-color);
}

.tab-btn:hover {
    background-color: transparent;
    color: var(--sky-blue);
    border-color: var(--sky-blue);
    transform: translateY(-2px);
}

/* Expertise Areas Grid */
.expertise-areas {
    background-color: var(--bg-light);
}

.expertise-areas-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin-top: 2rem;
}

/* Expertise Area Card - Flip Effect */
.expertise-area-card {
    position: relative;
    height: auto;
    min-height: 550px;
    perspective: 1000px;
    cursor: pointer;
}

.expertise-area-card__front,
.expertise-area-card__back {
    position: absolute;
    width: 100%;
    height: 100%;
    min-height: 550px;
    backface-visibility: hidden;
    transition: transform 0.6s ease;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.expertise-area-card__front {
    background-color: var(--bg-white);
    transform: rotateY(0deg);
    display: flex;
    flex-direction: column;
    padding: 2.5rem;
    z-index: 2;
}

.expertise-area-card__back {
    background: var(--primary-color);
    color: var(--text-white);
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 3rem;
    text-align: center;
}

/* Hover Effect - Flip */
.expertise-area-card:hover .expertise-area-card__front {
    transform: rotateY(-180deg);
}

.expertise-area-card:hover .expertise-area-card__back {
    transform: rotateY(0deg);
}

/* Front Card Styles */
.expertise-area-card__icon {
    width: 80px;
    height: 80px;
    background: var(--sky-blue);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.expertise-area-card__icon i {
    font-size: 2.5rem;
    color: var(--text-white);
}

.expertise-area-card__title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    line-height: 1.4;
}

.expertise-area-card__list {
    list-style: none;
    flex: 1;
    overflow: visible;
}

.expertise-area-card__list li {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0.85rem;
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    line-height: 1.6;
}

.expertise-area-card__list li i {
    color: var(--sky-blue);
    margin-top: 0.3rem;
    font-size: 0.75rem;
    flex-shrink: 0;
}

/* Back Card Styles */
.expertise-area-card__back-title {
    font-size: 1.75rem;
    font-weight: 900;
    margin-bottom: 2rem;
    line-height: 1.4;
    color: var(--text-white);
}

.expertise-area-card__back-desc {
    font-size: 1rem;
    line-height: 1.8;
    opacity: 0.95;
    color: var(--text-white);
}

/* Card Animations */
.expertise-area-card {
    animation: fadeInUp 0.6s ease-out forwards;
}

.expertise-area-card:nth-child(1) { animation-delay: 0.05s; }
.expertise-area-card:nth-child(2) { animation-delay: 0.1s; }
.expertise-area-card:nth-child(3) { animation-delay: 0.15s; }
.expertise-area-card:nth-child(4) { animation-delay: 0.2s; }
.expertise-area-card:nth-child(5) { animation-delay: 0.25s; }
.expertise-area-card:nth-child(6) { animation-delay: 0.3s; }
.expertise-area-card:nth-child(7) { animation-delay: 0.35s; }
.expertise-area-card:nth-child(8) { animation-delay: 0.4s; }
.expertise-area-card:nth-child(9) { animation-delay: 0.45s; }
.expertise-area-card:nth-child(10) { animation-delay: 0.5s; }
.expertise-area-card:nth-child(11) { animation-delay: 0.55s; }
.expertise-area-card:nth-child(12) { animation-delay: 0.6s; }
.expertise-area-card:nth-child(13) { animation-delay: 0.65s; }

/* CTA Section */
.cta-section {
    background: var(--primary-color);
    color: var(--text-white);
}

.cta-box {
    text-align: center;
    padding: 3rem;
    animation: scaleIn 0.8s ease-out;
}

.cta-box__title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 1.5rem;
    color: var(--text-white);
}

.cta-box__description {
    font-size: 1.2rem;
    line-height: 1.8;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    color: var(--text-white);
}

.cta-section .btn {
    background-color: var(--sky-blue);
    color: var(--text-white);
    border: 2px solid var(--sky-blue);
}

.cta-section .btn:hover {
    background-color: transparent;
    color: var(--sky-blue);
    border-color: var(--sky-blue);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(135, 206, 235, 0.4);
}

.cta-section .btn:active,
.cta-section .btn:focus {
    background-color: var(--sky-blue);
    color: var(--text-white);
    border-color: var(--sky-blue);
}

.btn--large {
    padding: 1.2rem 3rem;
    font-size: 1.1rem;
}

/* =============== CASE STUDIES SECTION =============== */
.case-studies {
    background-color: var(--bg-white);
}

.case-studies-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2.5rem;
    margin-top: 3rem;
}

/* Case Study Card - Flip Effect */
.case-study-card {
    position: relative;
    height: auto;
    min-height: 400px;
    perspective: 1000px;
    cursor: pointer;
}

.case-study-card__front,
.case-study-card__back {
    position: absolute;
    width: 100%;
    height: 100%;
    min-height: 400px;
    backface-visibility: hidden;
    transition: transform 0.6s ease;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.case-study-card__front {
    background-color: var(--bg-white);
    transform: rotateY(0deg);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    z-index: 2;
}

.case-study-card__back {
    background: var(--primary-color);
    color: var(--text-white);
    transform: rotateY(180deg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 3rem;
    text-align: center;
}

/* Hover Effect - Flip */
.case-study-card:hover .case-study-card__front {
    transform: rotateY(-180deg);
}

.case-study-card:hover .case-study-card__back {
    transform: rotateY(0deg);
}

/* Front Side Styles */
.case-study-card__badge {
    background: var(--sky-blue);
    color: var(--text-white);
    padding: 0.75rem 1.5rem;
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
}

/* Back Side Badge - 황토색 */
.case-study-card__back .case-study-card__badge {
    background: var(--ochre-main);
    margin-bottom: 2rem;
}

.case-study-card__front .case-study-card__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 1.5rem 2rem 1rem 2rem;
    line-height: 1.5;
}

.case-study-card__front .case-study-card__desc {
    font-size: 0.95rem;
    color: var(--text-light);
    line-height: 1.8;
    padding: 0 2rem 2rem 2rem;
    flex: 1;
}

/* Back Side Styles */
.case-study-card__back-title {
    display: none; /* 결과 텍스트 숨김 */
}

.case-study-card__back-result {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1.8;
    color: var(--text-white);
}

.case-studies-cta {
    text-align: center;
    margin-top: 4rem;
    padding: 2.5rem;
    background-color: var(--bg-light);
    border-radius: var(--border-radius);
}

.case-studies-cta__text {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

/* =============== RESPONSIVE DESIGN =============== */
@media screen and (max-width: 968px) {
    .page-hero__title {
        font-size: 2.5rem;
    }

    .page-hero__subtitle {
        font-size: 1.2rem;
    }

    .expertise-areas-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
        gap: 2rem;
    }

    .expertise-area-card {
        min-height: 500px;
    }

    .expertise-area-card__front,
    .expertise-area-card__back {
        min-height: 500px;
        padding: 2rem;
    }

    .expertise-area-card__icon {
        width: 70px;
        height: 70px;
    }

    .expertise-area-card__icon i {
        font-size: 2rem;
    }

    .expertise-area-card__title {
        font-size: 1.3rem;
    }

    .expertise-area-card__list li {
        font-size: 0.85rem;
        margin-bottom: 0.7rem;
    }

    .expertise-area-card__back-title {
        font-size: 1.5rem;
    }

    .expertise-area-card__back-desc {
        font-size: 0.95rem;
    }

    .cta-box__title {
        font-size: 1.8rem;
    }

    .cta-box__description {
        font-size: 1rem;
    }

    .case-studies-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .case-study-card__content {
        padding: 1.5rem;
    }

    .case-study-card__title {
        font-size: 1.15rem;
    }

    .case-studies-cta {
        padding: 2rem 1.5rem;
    }

    .case-studies-cta__text {
        font-size: 1.1rem;
    }
}

@media screen and (max-width: 576px) {
    .page-hero {
        padding: 6rem 0 4rem;
    }

    .page-hero__title {
        font-size: 2rem;
    }

    .page-hero__subtitle {
        font-size: 1rem;
    }

    .tab-btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.95rem;
    }

    .tab-btn i {
        font-size: 1.1rem;
    }

    /* 업무분야 카드 2열 레이아웃 */
    .expertise-areas-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .expertise-area-card {
        min-height: 400px;
    }

    .expertise-area-card__front,
    .expertise-area-card__back {
        min-height: 400px;
        padding: 1.25rem;
    }

    .expertise-area-card__icon {
        width: 60px;
        height: 60px;
    }

    .expertise-area-card__icon i {
        font-size: 1.75rem;
    }

    .expertise-area-card__title {
        font-size: 1.2rem;
        margin-bottom: 1rem;
    }

    .expertise-area-card__list li {
        font-size: 0.8rem;
        margin-bottom: 0.65rem;
    }

    .expertise-area-card__back-title {
        font-size: 1.3rem;
        margin-bottom: 1.5rem;
    }

    .expertise-area-card__back-desc {
        font-size: 0.9rem;
        line-height: 1.7;
    }

    .cta-box {
        padding: 2rem 1rem;
    }

    .cta-box__title {
        font-size: 1.5rem;
    }

    .btn--large {
        padding: 1rem 2rem;
        font-size: 1rem;
    }

    /* 대표 사례 2열 레이아웃 */
    .case-studies-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }

    .case-study-card {
        min-height: 350px;
    }

    .case-study-card__front,
    .case-study-card__back {
        min-height: 350px;
        padding: 1.25rem;
    }

    .case-study-card__badge {
        padding: 0.6rem 1rem;
        font-size: 0.85rem;
    }

    .case-study-card__front .case-study-card__title {
        font-size: 1.1rem;
        margin: 1.25rem 1.5rem 0.75rem 1.5rem;
    }

    .case-study-card__front .case-study-card__desc {
        font-size: 0.9rem;
        padding: 0 1.5rem 1.5rem 1.5rem;
    }

    .case-study-card__back {
        padding: 2rem 1.5rem;
    }

    .case-study-card__back-title {
        display: none; /* 결과 텍스트 숨김 */
    }

    .case-study-card__back-result {
        font-size: 1.2rem;
    }

    .case-studies-cta {
        padding: 2rem 1rem;
    }

    .case-studies-cta__text {
        font-size: 1rem;
    }
}

/* Mobile Touch - Tap to Flip */
@media (hover: none) and (pointer: coarse) {
    .expertise-area-card {
        touch-action: manipulation;
    }
    
    .expertise-area-card.flipped .expertise-area-card__front {
        transform: rotateY(-180deg);
    }
    
    .expertise-area-card.flipped .expertise-area-card__back {
        transform: rotateY(0deg);
    }

    .case-study-card {
        touch-action: manipulation;
    }
    
    .case-study-card.flipped .case-study-card__front {
        transform: rotateY(-180deg);
    }
    
    .case-study-card.flipped .case-study-card__back {
        transform: rotateY(0deg);
    }
}