/* =========================================================================
   Variables & Theme
   ========================================================================= */
:root {
    /*body*/
    --color-body-bg: radial-gradient(ellipse at center, #eee8e0 0%, #c4b9af 100%);

    /*book::before*/
    --color-book-cover: #4a3623;

    /*side-control-panel, pageCounter*/
    --color-ui-bg: rgba(40, 30, 20, 0.85);

    /*side-control-btn, progressBar*/
    --color-ui-btn: #6a4a30;

    /*side-control-btn:hover*/
    --color-ui-btn-hover: #8a6a50;
}

/* =========================================================================
   Fonts & Global Reset
   ========================================================================= */
@font-face {
    font-family: 'NoonnuBasicGothicRegular';
    src: url('https://fastly.jsdelivr.net/gh/projectnoonnu/noon-2410@1.0/NoonnuBasicGothicRegular.woff2') format('woff2');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: 'OngleipKonkon';
    src: url('https://cdn.jsdelivr.net/gh/projectnoonnu/2412-1@1.0/Ownglyph_corncorn-Rg.woff2') format('woff2');
    font-weight: normal;
    font-display: swap;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    background: var(--color-body-bg);
    user-select: none;
    -webkit-user-select: none;
}

/* =========================================================================
   Container & Viewport
========================================================================= */
.ebook-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.book-viewport {
    width: 100%;
    height: 100vh;
    padding-bottom: 80px;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 2000px;
    position: relative;
    touch-action: none;
    isolation: isolate;
    z-index: 10;
    pointer-events: none;
}

/* =========================================================================
   Desktop Book View
========================================================================= */
.book {
    position: relative;
    width: min(85vw, calc((100vh - 160px) * 2 / 1.414));
    max-width: 1600px;
    aspect-ratio: 2 / 1.414;
    transform-style: preserve-3d;
    cursor: pointer;
    contain: layout;
    transition: transform 1.2s cubic-bezier(0.15, 0.95, 0.2, 1);
    pointer-events: auto;
}

.book.closed-front {
    transform: translate(-25%, 40px);
}

.book.closed-back {
    transform: translateX(25%);
}


.page {
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    transform-origin: left center;
    transform-style: preserve-3d;
    cursor: pointer;
    contain: layout style;
    transition: transform 1.2s cubic-bezier(0.15, 0.95, 0.2, 1);
    will-change: auto;
}

.page.flipped {
    transform: rotateY(-180deg);
}

.page.flipping {
    z-index: 1000 !important;
}

.page-face {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    background-color: #faf8f5;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    contain: layout style paint;
    cursor: pointer;
}

.page-face.back {
    transform: rotateY(180deg);
}

.page-face.front img,
.page-face.back img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    pointer-events: none;
    user-drag: none;
    -webkit-user-drag: none;
    color: transparent;
}

#left-static {
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    z-index: 500;
    pointer-events: none;
    background: #faf8f5;
    display: none;
    contain: layout style paint;
}

#left-static img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    color: transparent;
}

#left-static img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    display: block;
    color: transparent;
}

/* =========================================================================
   Mobile View
========================================================================= */
#mobile-view {
    display: none;
    position: absolute;
    top: 12px;
    left: 12px;
    right: 12px;
    bottom: 50px;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    background: transparent;
    touch-action: none;
    pointer-events: auto;
    contain: layout style paint;
}

#mobile-img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    display: block;
    border-radius: 6px;
    pointer-events: none;
    user-drag: none;
    -webkit-user-drag: none;
    outline: 8px solid var(--color-book-cover);
    outline-offset: 0px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.5), inset 0 0 12px rgba(255, 255, 255, 0.08);
    opacity: 1;
    transition: opacity 0.3s ease-in-out;
    color: transparent;
}

#mobile-img.loading {
    opacity: 0;
}

/* =========================================================================
   UI Overlay Components
========================================================================= */
.controls-container {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 100;
    contain: layout style paint;
    transition: transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) 1.5s, opacity 0.6s ease 1.5s;
}

body.is-front-cover .controls-container {
    transform: translate(-50%, 60px) scale(0.5);
    opacity: 0;
    pointer-events: none;
    transition-delay: 0s;
}

#pageCounter {
    background: var(--color-ui-bg);
    color: #fff;
    padding: 6px 20px;
    border-radius: 30px;
    font-size: 15px;
}

.progress-container {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100vw;
    height: 10px;
    z-index: 200;
    contain: layout;
    transition: height 0.3s cubic-bezier(0.25, 1, 0.5, 1), transform 0.8s cubic-bezier(0.15, 0.95, 0.2, 1) 2.0s, opacity 0.8s ease 2.0s;
}

body.is-front-cover .progress-container {
    transform: translateY(80px);
    opacity: 0;
    pointer-events: none;
    transition-delay: 0s;
}

.progress-container:hover {
    height: 18px;
}

.progress-bg {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.15);
    z-index: 0;
    contain: layout style paint;
}

.progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: var(--color-ui-btn);
    z-index: 1;
    pointer-events: none;
    will-change: width;
    transition: width 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.progress-fill.dragging {
    transition: none !important;
}

#progressBar {
    display: block;
    position: relative;
    appearance: none;
    -webkit-appearance: none;
    padding: 0;
    margin: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    z-index: 2;
    touch-action: none;
    -webkit-tap-highlight-color: transparent;
    outline: none;
    border: none;
    cursor: pointer;
}

#progressBar::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 0;
    height: 40px;
    background: transparent;
    cursor: pointer;
    border: none;
    outline: none;
}

#progressBar::-moz-range-thumb {
    width: 0;
    height: 40px;
    background: transparent;
    border: none;
    outline: none;
    cursor: pointer;
}

#progressBar::-moz-focus-inner {
    border: 0;
}

.page-preview {
    position: absolute;
    bottom: 100%;
    left: 0;
    transform: translateX(-50%) translateY(15px);
    width: 110px;
    height: calc(110px * 1.414);
    background: #fff;
    border: 3px solid var(--color-ui-btn);
    border-radius: 6px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s, transform 0.2s cubic-bezier(0.25, 1, 0.5, 1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    z-index: 210;
    contain: layout style paint;
}

.progress-container:hover .page-preview.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-15px);
}

.page-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    color: transparent;
}

.page-preview span {
    position: absolute;
    bottom: 0;
    width: 100%;
    background: var(--color-ui-bg);
    color: #fff;
    text-align: center;
    font-size: 13px;
    padding: 4px 0;
}

.bookmark-track {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 0;
    z-index: 210;
    pointer-events: none;
}

.progress-bookmark {
    position: absolute;
    bottom: 15px;
    left: var(--bookmark-pos);
    transform: translateX(-50%);
    background: var(--bookmark-bg);
    color: #5a4a3a;
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 13px;
    line-height: 1.3;
    text-align: center;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    pointer-events: auto;
    cursor: pointer;
    font-weight: bold;
    z-index: 10;
    transform-origin: bottom center;
    contain: layout;
    opacity: 1;
    transition: transform 0.2s cubic-bezier(0.2, 0, 0.2, 1), opacity 0.3s ease;
    animation: bookmark-pop-in 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) 2.5s backwards;
}

body.is-front-cover .progress-bookmark {
    opacity: 0;
    transform: translate(-50%, 60px) scale(0.5);
    pointer-events: none;
    transition-delay: 0s;
    animation: none;
}

.bookmark-hitbox {
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -15px;
    background: transparent;
    z-index: -1;
    cursor: pointer;
}

.progress-bookmark::before {
    content: '';
    position: absolute;
    top: 100%;
    left: var(--stem-left, calc(50% - 1px));
    width: 2px;
    height: 15px;
    background-color: var(--bookmark-bg);
}

.progress-bookmark::after {
    content: '';
    position: absolute;
    left: var(--stem-center, 50%);
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--bookmark-bg);
    top: calc(100% + 12px);
}

.progress-bookmark:nth-child(even) {
    bottom: 50px;
    transform-origin: bottom center;
}

.progress-bookmark:nth-child(even)::before {
    height: 50px;
}

.progress-bookmark:nth-child(even)::after {
    top: calc(100% + 47px);
}

.progress-bookmark:hover {
    transform: translateX(-50%) scale(1.15) translateY(-5px);
    z-index: 25;
}

.progress-bookmark:nth-child(even):hover {
    transform: translateX(-50%) scale(1.15) translateY(-5px);
    z-index: 25;
}

@keyframes bookmark-pop-in {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(40px) scale(0.5);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0) scale(1);
    }
}

.side-control-panel {
    position: fixed;
    top: 50%;
    right: -50px;
    transform: translateY(-50%);
    width: 70px;
    background: var(--color-ui-bg);
    box-shadow: -4px 0 15px rgba(0, 0, 0, 0.3);
    border-radius: 35px 0 0 35px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px 0;
    gap: 15px;
    z-index: 300;
    transition: right 0.3s cubic-bezier(0.25, 1, 0.5, 1);
    contain: layout style paint;
}

.side-control-panel.show-initial,
.side-control-panel:hover {
    right: 0;
}

.side-control-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-ui-btn);
    border: none;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: background 0.2s, transform 0.2s;
}

.side-control-btn:hover {
    background: var(--color-ui-btn-hover);
    transform: scale(1.1);
}

.side-control-btn.toggle-anim-btn.off {
    background: #444;
    color: #aaa;
}

/* =========================================================================
   Layout Queries & States
   ========================================================================= */
@media (max-width: 768px) {
    .progress-bookmark {
        display: none;
    }

    .controls-container,
    #interactive-container {
        display: none !important;
    }

    .progress-container {
        height: 24px;
        pointer-events: auto !important;
        transform: none !important;
        opacity: 1 !important;
    }

    .progress-container:hover {
        height: 24px;
    }

    body.is-front-cover .progress-container {
        transform: none !important;
        opacity: 1 !important;
        pointer-events: auto !important;
        transition: none !important;
    }

    .side-control-panel {
        display: none !important;
    }
}

@media (prefers-reduced-motion: reduce) {
    .page {
        transition: none;
    }

    #mobile-img {
        transition: none;
    }

    .progress-bookmark {
        transition: none;
    }
}

body.disable-animation .page {
    transition: none !important;
}

body.disable-animation #mobile-img {
    transition: none !important;
}

body.disable-animation .progress-bookmark {
    transition: none !important;
}

body.disable-animation .progress-fill {
    transition: none !important;
}

body.disable-animation .cover-page {
    transition: none !important;
}

body.disable-animation .book {
    transition: none !important;
}

body.disable-animation .controls-container,
body.disable-animation .progress-container {
    transition: none !important;
}

/* =========================================================================
   Interactive Background Images
   ========================================================================= */
#interactive-container {
    display: contents;
    pointer-events: none;
}

.interactive-img-frame {
    position: fixed;
    z-index: 5;
    pointer-events: auto;
    width: 210px;
    transition:
        transform 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275),
        top 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275),
        left 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275),
        right 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275),
        bottom 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275),
        box-shadow 0.3s ease;
    cursor: pointer;

    background: #fff;
    padding: 10px 10px 50px 10px;
    box-shadow:
        0 6px 20px rgba(0, 0, 0, 0.22),
        0 2px 6px rgba(0, 0, 0, 0.12);
    border-radius: 2px;
}

.interactive-img-frame.is-landscape {
    width: 280px;
    max-width: 360px;
}

.interactive-img-frame.is-expanded {
    z-index: 2000;
    pointer-events: auto !important;
}

.author-tag {
    position: absolute;
    bottom: 8px;
    left: 12px;
    right: 12px;
    font-size: 24px;
    color: #2e2e2e;
    text-align: right;
    font-family: 'OngleipKonkon';
    letter-spacing: -0.01em;
    opacity: 0.8;
}

body.is-front-cover .interactive-img-frame,
.interactive-img-frame.is-hidden {
    transform: translate(calc(var(--base-tx) * 5), calc(var(--base-ty) * 5)) rotate(calc(var(--base-rot) * 2)) scale(0.5) !important;
    pointer-events: none;
    transition: transform 0.6s cubic-bezier(0.15, 0.95, 0.2, 1) 0s !important;
    animation: none !important;
}

.interactive-img-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: none;
    user-drag: none;
    -webkit-user-drag: none;
    color: transparent;
}

/* 우상단 (Top-Right) */
.interactive-img-frame.pos-top-right {
    --base-tx: 15%;
    --base-ty: -15%;
    --base-rot: 6deg;
    top: 0;
    right: 0;
    transform: translate(var(--base-tx), var(--base-ty)) rotate(var(--base-rot));
    animation: interactive-entrance 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) 3.0s backwards;
}

.interactive-img-frame.pos-top-right:hover {
    transform: translate(5%, -5%) rotate(3deg) scale(1.1);
}

.interactive-img-frame.pos-top-right.is-expanded,
.interactive-img-frame.pos-top-right.is-expanded:hover {
    transform: translate(-25%, 25%) rotate(3deg) scale(1.4);
    z-index: 2000;
}

/* 좌상단 (Top-Left) */
.interactive-img-frame.pos-top-left {
    --base-tx: -15%;
    --base-ty: -15%;
    --base-rot: 5deg;
    top: 0;
    left: 0;
    transform: translate(var(--base-tx), var(--base-ty)) rotate(var(--base-rot));
    animation: interactive-entrance 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) 3.0s backwards;
}

.interactive-img-frame.pos-top-left:hover {
    transform: translate(-5%, -5%) rotate(-2deg) scale(1.1);
}

.interactive-img-frame.pos-top-left.is-expanded,
.interactive-img-frame.pos-top-left.is-expanded:hover {
    transform: translate(25%, 25%) rotate(-2deg) scale(1.4);
    z-index: 2000;
}


/* 우하단 (Bottom-Right) */
.interactive-img-frame.pos-bottom-right {
    --base-tx: 66%;
    --base-ty: -6%;
    --base-rot: 5deg;
    bottom: 0;
    right: 120px;
    transform: translate(var(--base-tx), var(--base-ty)) rotate(var(--base-rot));
    animation: interactive-entrance 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) 3.0s backwards;
}

.interactive-img-frame.pos-bottom-right:hover {
    transform: translate(50%, -10%) rotate(2deg) scale(1.1);
}

.interactive-img-frame.pos-bottom-right.is-expanded,
.interactive-img-frame.pos-bottom-right.is-expanded:hover {
    transform: translate(25%, -25%) rotate(2deg) scale(1.4);
    z-index: 2000;
}

/* 좌중단 (Middle-Left) */
.interactive-img-frame.pos-middle-left {
    --base-tx: -25%;
    --base-ty: 0%;
    --base-rot: 8deg;
    top: 45%;
    left: 0;
    transform: translate(var(--base-tx), var(--base-ty)) rotate(var(--base-rot));
    animation: interactive-entrance 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) 3.0s backwards;
}

.interactive-img-frame.pos-middle-left:hover {
    transform: translate(-5%, 0%) rotate(4deg) scale(1.1);
}

.interactive-img-frame.pos-middle-left.is-expanded,
.interactive-img-frame.pos-middle-left.is-expanded:hover {
    transform: translate(25%, 0%) rotate(4deg) scale(1.4);
    z-index: 2000;
}

@keyframes interactive-entrance {
    from {
        transform: translate(calc(var(--base-tx) * 5), calc(var(--base-ty) * 5)) rotate(calc(var(--base-rot) * 2)) scale(0.5);
    }

    to {
        transform: translate(var(--base-tx), var(--base-ty)) rotate(var(--base-rot)) scale(1);
    }
}

/* =========================================================================
   Book Shadows (Custom Implementation)
   ========================================================================= */

/* 책 바닥 그림자 (Floor Shadow) */
.book::before,
.book::after {
    content: '';
    position: absolute;
    top: 0;
    width: 50%;
    height: 100%;
    background: transparent;
    box-shadow: 0 0 5px rgba(40, 40, 40, 0.7);
    pointer-events: none;
    z-index: -1;
    transition: opacity 2s ease-out;
}

.book::before {
    left: 0;
}

.book::after {
    left: 50%;
}

.book.closed-front::before,
.book.closed-back::after {
    opacity: 0;
    transition: opacity 0s;
}

@media (min-width: 769px) {

    .book.closed-front,
    .book.closed-back {
        cursor: none;
        pointer-events: none;
    }

    .book.closed-front .page,
    .book.closed-back .page {
        cursor: pointer;
        pointer-events: auto;
    }
}

/* 가운데 그림자 (Spine Shadow) */
.midShadow {
    position: absolute;
    top: 0;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

/* 오른쪽 페이지용 가운데 그림자 */
.midShadow.rightShadow {
    left: 0;
    width: 40px;
    background-image: linear-gradient(to right,
            rgba(53, 53, 53, 0.5) 0,
            rgba(53, 53, 53, 0.2) 40%,
            rgba(53, 53, 53, 0.1) 60%,
            rgba(200, 200, 200, 0) 100%);
}

/* 왼쪽 페이지용 가운데 그림자 */
.midShadow.leftShadow {
    right: 0;
    width: 102px;
    background-image: linear-gradient(to left,
            rgba(60, 60, 60, 0.4) 0,
            rgba(50, 50, 50, 0.1) 54%,
            rgba(200, 200, 200, 0) 100%);
}

/* 표지 테두리 그림자 (Cover Shadow) */
.cover_shadow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
}

.cover_shadow.side .normal_left_border {
    position: absolute;
    left: 0;
    top: 0;
    width: 1.2%;
    height: 100%;
    background-image: linear-gradient(to right,
            rgba(20, 20, 20, 0.5),
            rgba(240, 240, 200, 0));
}