/* E-Book Section Style - Final Fix & Dark Mode */

:root {
    --ebook-bg: #f0f2f5;
    --ebook-control-bg: #fff;
    --ebook-text: #333;
    --ebook-btn-bg: #f8f9fa;
    --ebook-btn-hover: #e2e6ea;
}

[data-theme="dark"] {
    --ebook-bg: #1a1a1a;
    --ebook-control-bg: #2d2d2d;
    --ebook-text: #e0e0e0;
    --ebook-btn-bg: #3d3d3d;
    --ebook-btn-hover: #4d4d4d;
}

.ebook-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 0;
    background: var(--ebook-bg);
    min-height: 600px;
    max-height: 90vh;
    overflow: hidden;
    position: relative;
    width: 100%;
    box-sizing: border-box;
    transition: background 0.3s;
}

.ebook-loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--ebook-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.page-loading-alert {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    padding: 15px 30px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: bold;
    z-index: 10000;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.loading-text {
    margin-top: 20px;
    font-size: 16px;
    color: var(--ebook-text);
    font-weight: 600;
}

.spinner {
    border: 4px solid rgba(0,0,0,0.1);
    border-top: 4px solid #3498db;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
}

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

.flipbook-viewport {
    transition: transform 0.3s ease;
    transform-origin: center top;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: visible;
    /* 💡 [추가] 3D 효과를 위한 원근감 설정 */
    perspective: 2000px;
}

.container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    justify-content: center;
}

.flipbook {
    max-width: 100%;
    /*margin: 20px;*/
    /* 💡 [추가] 책 전체에 입체감 부여 */
    transform-style: preserve-3d;
}

.flipbook .page {
    background-color: white;
    /* 💡 [수정] 그림자 효과 강화 */
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

/* 💡 [추가] 왼쪽 페이지 안쪽(오른쪽) 그림자 - 책이 접히는 느낌 */
.flipbook .even {
    background: linear-gradient(to right, #fff 95%, #e0e0e0 100%);
}
.flipbook .even::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 30px; /* 그림자 너비 */
    height: 100%;
    background: linear-gradient(to right, rgba(0,0,0,0) 0%, rgba(0,0,0,0.15) 100%);
    pointer-events: none;
    z-index: 10;
}

/* 💡 [추가] 오른쪽 페이지 안쪽(왼쪽) 그림자 - 책이 접히는 느낌 */
.flipbook .odd {
    background: linear-gradient(to left, #fff 95%, #e0e0e0 100%);
}
.flipbook .odd::after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 30px; /* 그림자 너비 */
    height: 100%;
    background: linear-gradient(to left, rgba(0,0,0,0) 0%, rgba(0,0,0,0.15) 100%);
    pointer-events: none;
    z-index: 10;
}

.flipbook canvas {
    width: 100%;
    height: 100%;
    display: block;
}

.nav-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
    background: rgba(0,0,0,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--ebook-text);
    font-size: 20px;
    z-index: 100;
    transition: all 0.3s;
}

.nav-arrow:hover {
    background: rgba(0,0,0,0.3);
    color: #fff;
}

.nav-prev { left: 20px; }
.nav-next { right: 20px; }

.ebook-controls {
    margin-top: 20px;
    display: flex;
    align-items: center;
    gap: 20px;
    background: var(--ebook-control-bg);
    padding: 10px 20px;
    border-radius: 50px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    z-index: 100;
    transition: opacity 0.5s, background 0.3s;
    flex-wrap: wrap;
    justify-content: center;
}

.control-group { display: flex; align-items: center; gap: 10px; }
.ebook-controls .btn { background: var(--ebook-btn-bg); color: var(--ebook-text); border: 1px solid rgba(0,0,0,0.1); width: 40px; height: 40px; border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.2s; font-size: 16px; text-decoration: none; }
.ebook-controls .btn:hover { background: var(--ebook-btn-hover); }
.page-input-wrap { display: flex; align-items: center; gap: 5px; font-size: 14px; font-weight: 600; color: var(--ebook-text); }

#page-input, .page-input {
    width: 100px;
    height: 30px;
    text-align: center;
    border: 1px solid rgba(0,0,0,0.2);
    border-radius: 4px;
    font-weight: bold;
    background: var(--ebook-btn-bg);
    color: var(--ebook-text);
}

/* 💡 [핵심 수정] 숫자 입력창 화살표 숨기기 */
#page-input::-webkit-outer-spin-button,
#page-input::-webkit-inner-spin-button,
.page-input::-webkit-outer-spin-button,
.page-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
#page-input[type=number],
.page-input[type=number] {
    -moz-appearance: textfield;
}

.ebook-empty { text-align: center; padding: 50px; color: var(--ebook-text); border: 2px dashed rgba(0,0,0,0.2); border-radius: 10px; }