/* PDF 이북 뷰어 스타일 */
.pdf-ebook-viewer-wrapper {
    margin: 30px 0;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
}

.pdf-ebook-viewer {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}

.ebook-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: #2c5aa0;
    color: #fff;
    flex-wrap: wrap;
    gap: 15px;
}

.ebook-header h3 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.ebook-controls {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.ebook-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    padding: 0;
    border: none;
    background: rgba(255, 255, 255, 0.2);
    color: #fff;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 14px;
}

.ebook-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

.ebook-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.ebook-btn.download-btn {
    text-decoration: none;
    color: #fff;
}

.page-info {
    color: #fff;
    font-weight: 500;
    padding: 0 10px;
    min-width: 80px;
    text-align: center;
}

.ebook-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    padding: 40px;
}

.ebook-loading.hidden {
    display: none;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid #f3f3f3;
    border-top: 4px solid #2c5aa0;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.ebook-loading p {
    color: #666;
    font-size: 16px;
    margin: 0;
}

.ebook-container {
    padding: 0;
    background: #e5e5e5;
    min-height: 600px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    overflow: hidden;
    position: relative;
    width: 100%;
}

.ebook-pages {
    display: flex;
    gap: 0;
    justify-content: center;
    align-items: flex-start;
    perspective: 2500px;
    position: relative;
    width: 100%;
    height: 100%;
    max-width: 100%;
}

/* PC: 2페이지 펼침 */
@media (min-width: 769px) {
    .ebook-pages {
        flex-direction: row;
    }
    
    .ebook-page {
        position: relative;
        background: #fff;
        box-shadow: 0 0 0 rgba(0, 0, 0, 0);
        border-radius: 0;
        overflow: hidden;
        transition: none; /* 애니메이션 중 transition 비활성화 */
        cursor: pointer;
        flex: 1;
        width: 50%;
        max-width: 50%;
        min-width: 50%; /* 최소 너비 고정 */
        user-select: none;
        -webkit-user-select: none;
        transform: translateX(0); /* 기본 transform 고정 */
        will-change: transform; /* 성능 최적화 */
    }
    
    /* 3D 효과 제거 - 크기 변화 방지 */
    .ebook-pages {
        transform-style: flat;
    }
    
    .ebook-page {
        backface-visibility: visible;
        -webkit-backface-visibility: visible;
    }
    
    /* 페이지 간 경계선 효과 */
    .ebook-page:not(:last-child) {
        border-right: 1px solid rgba(0, 0, 0, 0.1);
    }
    
    .ebook-page canvas {
        display: block;
        width: 100%;
        height: auto;
        margin: 0;
        padding: 0;
        user-select: none;
        -webkit-user-select: none;
    }
    
    /* 2페이지 펼침 효과 - 여백 없이, 가로 꽉 차게 */
    /* perspective 완전 제거로 크기 변화 방지 */
    
    .ebook-pages.two-page .ebook-page:first-child {
        transform: translateX(0);
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.2);
        /* 좌측 페이지는 절대 움직이지 않도록 */
        will-change: auto;
    }
    
    .ebook-pages.two-page .ebook-page:last-child {
        transform: translateX(0);
        box-shadow: 5px 0 20px rgba(0, 0, 0, 0.2);
    }
    
    /* 슬라이드 애니메이션 - 왼쪽 페이지 (우→좌) */
    .ebook-page.flip-left {
        animation: flipLeftPage 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
        transition: none !important; /* 애니메이션 중 transition 완전 비활성화 */
        overflow: hidden; /* 슬라이드 중 내용이 보이지 않도록 */
    }
    
    /* 슬라이드 애니메이션 - 오른쪽 페이지 (우→좌) */
    .ebook-page.flip-right {
        animation: flipRightPage 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
        transition: none !important; /* 애니메이션 중 transition 완전 비활성화 */
        overflow: hidden; /* 슬라이드 중 내용이 보이지 않도록 */
    }
    
    /* 좌우 하단 모서리 클릭 영역 (플립 표시 없이) */
    .corner-click-zone {
        position: absolute;
        width: 80px;
        height: 80px;
        bottom: 0;
        z-index: 10;
        cursor: pointer;
        opacity: 0;
        transition: opacity 0.3s ease;
    }
    
    .ebook-page:hover .corner-click-zone {
        opacity: 0.2;
    }
    
    .corner-click-zone:hover {
        opacity: 0.4 !important;
    }
    
    .ebook-page:first-child .corner-click-zone {
        left: 0;
    }
    
    .ebook-page:last-child .corner-click-zone {
        right: 0;
    }
}

/* 왼쪽 페이지가 좌에서 우로 슬라이드하는 애니메이션 (이전 페이지) */
@keyframes flipLeftPage {
    0% {
        transform: translateX(0);
        opacity: 1;
    }
    50% {
        transform: translateX(50%);
        opacity: 0.7;
    }
    100% {
        transform: translateX(100%);
        opacity: 0;
        visibility: hidden;
    }
}

/* 오른쪽 페이지가 우에서 좌로 슬라이드하는 애니메이션 (다음 페이지) - 다음 페이지가 보이도록 */
@keyframes flipRightPage {
    0% {
        transform: translateX(0);
        opacity: 1;
    }
    50% {
        transform: translateX(-50%);
        opacity: 0.7;
    }
    100% {
        transform: translateX(-100%);
        opacity: 0;
        visibility: hidden;
    }
}

/* 모바일: 1페이지 */
@media (max-width: 768px) {
    
    .pdf-ebook-viewer-wrapper {
        margin: 10px 0;
        padding: 0px;
    }

    .pdf-ebook-viewer {
        background: #fff;
        border-radius: 8px;
        overflow: hidden;
    }

    .ebook-header {
        padding: 12px 15px;
    }
    
    .ebook-header h3 {
        font-size: 16px;
        width: 100%;
    }
    
    .ebook-controls {
        width: 100%;
        justify-content: center;
    }
    
    .ebook-btn {
        width: 32px;
        height: 32px;
        font-size: 12px;
    }
    
    .page-info {
        font-size: 14px;
        min-width: 70px;
    }
    
    .ebook-container {
        padding: 0;
        min-height: 400px;
    }
    
    .ebook-pages {
        flex-direction: column;
        gap: 0;
        width: 100%;
    }
    
    .ebook-page {
        position: relative;
        background: #fff;
        box-shadow: 0 0 0 rgba(0, 0, 0, 0);
        border-radius: 0;
        overflow: hidden;
        width: 100%;
        transform-style: preserve-3d;
        transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }
    
    .ebook-page canvas {
        display: block;
        width: 100%;
        height: auto;
        margin: 0;
        padding: 0;
        user-select: none;
        -webkit-user-select: none;
    }
    
    .ebook-page {
        user-select: none;
        -webkit-user-select: none;
    }
    
    /* 모바일 터치 스와이프 지원 */
    .ebook-page.swiping {
        transition: none;
    }
    
    /* 모바일 모서리 클릭 영역 */
    .corner-click-zone {
        left: 0;
        opacity: 0.2;
    }
    
    .ebook-page:hover .corner-click-zone {
        opacity: 0.4;
    }
    
    .corner-click-zone:hover {
        opacity: 0.6 !important;
    }
    
    /* 모바일 플립 애니메이션 */
    .ebook-page.flip-left {
        animation: flipLeftPageMobile 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
    }
    
    .ebook-page.flip-right {
        animation: flipRightPageMobile 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
    }
}

@keyframes flipLeftPageMobile {
    0% {
        transform: translateX(0);
        opacity: 1;
    }
    50% {
        transform: translateX(-50%);
        opacity: 0.5;
    }
    100% {
        transform: translateX(-100%);
        opacity: 0;
        visibility: hidden;
    }
}

@keyframes flipRightPageMobile {
    0% {
        transform: translateX(0);
        opacity: 1;
    }
    50% {
        transform: translateX(50%);
        opacity: 0.5;
    }
    100% {
        transform: translateX(100%);
        opacity: 0;
        visibility: hidden;
    }
}

/* 페이지 넘김 애니메이션 - 제거 (더 이상 사용하지 않음) */

/* 스크롤바 스타일 */
.ebook-container::-webkit-scrollbar {
    height: 8px;
}

.ebook-container::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

.ebook-container::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

.ebook-container::-webkit-scrollbar-thumb:hover {
    background: #555;
}