@import url("https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400;1,500&family=Crimson+Pro:ital,wght@0,300;0,400;0,500;1,300;1,400&display=swap");

:root {
    --paper-base: #f4ece1;
    --paper-warm: #efe5d6;
    --paper-edge: #e8dcc8;
    --paper-shadow: #d4c4a8;
    --paper-crease: #c9b899;
    --ink-primary: #2c2416;
    --ink-secondary: #4a3f2f;
    --ink-light: #6b5d4a;
    --ink-faint: #8a7b66;
    --accent-red: #8b3a3a;
    --accent-gold: #9c7a3c;
    --gutter-shadow: rgba(44, 36, 22, 0.12);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html,
body {
    height: 100%;
    overflow: hidden;
    background: #2c2416;
}

body {
    font-family: "Crimson Pro", "Georgia", serif;
    color: var(--ink-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: radial-gradient(
        ellipse at 50% 50%,
        #3d3224 0%,
        #2c2416 70%
    );
}

/* ===== UPLOAD SCREEN ===== */
.upload-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    width: 100vw;
    animation: fadeIn 0.8s ease;
}
.upload-screen h1 {
    font-family: "Cormorant Garamond", serif;
    font-size: 3.5rem;
    font-weight: 300;
    color: var(--paper-base);
    letter-spacing: 0.15em;
    margin-bottom: 0.25em;
    text-transform: uppercase;
}
.upload-screen .tagline {
    font-family: "Crimson Pro", serif;
    font-size: 1rem;
    color: var(--ink-faint);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    margin-bottom: 3rem;
    font-weight: 300;
}
.upload-zone {
    width: 320px;
    height: 200px;
    border: 1.5px dashed var(--ink-faint);
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}
.upload-zone:hover {
    border-color: var(--paper-edge);
    background: rgba(244, 236, 225, 0.05);
}
.upload-zone svg {
    width: 40px;
    height: 40px;
    stroke: var(--ink-faint);
    margin-bottom: 1rem;
    transition: stroke 0.3s;
    fill: none;
}
.upload-zone:hover svg {
    stroke: var(--paper-base);
}
.upload-zone span {
    color: var(--ink-faint);
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}
.upload-zone:hover span {
    color: var(--paper-edge);
}
.upload-zone input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}
.upload-zone.dragging {
    border-color: var(--accent-gold);
    background: rgba(156, 122, 60, 0.08);
}

/* ===== SAMPLE BOOKS ===== */
.sample-books {
    display: flex;
    gap: 24px;
    margin-bottom: 2rem;
    justify-content: center;
    align-items: flex-end;
}
.sample-book {
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: transform 0.3s ease;
}
.sample-book:hover {
    transform: translateY(-6px);
}
.sample-cover {
    width: 100px;
    height: 140px;
    object-fit: cover;
    border-radius: 2px 6px 6px 2px;
    box-shadow:
        2px 2px 8px rgba(0, 0, 0, 0.3),
        inset 0 0 0 1px rgba(255, 255, 255, 0.05);
    transition: box-shadow 0.3s ease;
}
.sample-book:hover .sample-cover {
    box-shadow:
        3px 4px 14px rgba(0, 0, 0, 0.45),
        inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}
.sample-cover::after {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(
        to bottom,
        rgba(0, 0, 0, 0.15),
        rgba(0, 0, 0, 0.08) 50%,
        rgba(0, 0, 0, 0.15)
    );
}
.sample-label {
    font-family: "Crimson Pro", serif;
    font-size: 0.72rem;
    color: var(--ink-faint);
    margin-top: 8px;
    letter-spacing: 0.03em;
    transition: color 0.3s;
    max-width: 110px;
    text-align: center;
    line-height: 1.3;
}
.sample-book:hover .sample-label {
    color: var(--paper-edge);
}
.sample-book.loading .sample-cover {
    opacity: 0.5;
}
.sample-book.loading {
    pointer-events: none;
    animation: pulse 1.5s ease infinite;
}

/* ===== BOOK WRAPPER ===== */
.book-wrapper {
    display: none;
    flex-direction: column;
    align-items: center;
    height: 100vh;
    width: 100vw;
    padding: 20px;
}
.book-wrapper.active {
    display: flex;
    animation: fadeIn 0.6s ease;
}

/* Top bar */
.top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 920px;
    padding: 8px 0 12px;
    flex-shrink: 0;
}
.book-title-display {
    font-family: "Cormorant Garamond", serif;
    color: var(--paper-shadow);
    font-size: 0.85rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-weight: 400;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 400px;
}
.top-controls {
    display: flex;
    gap: 6px;
    align-items: center;
}
.top-btn {
    background: none;
    border: 1px solid rgba(200, 185, 155, 0.2);
    color: var(--paper-shadow);
    padding: 5px 12px;
    border-radius: 3px;
    cursor: pointer;
    font-family: "Crimson Pro", serif;
    font-size: 0.78rem;
    letter-spacing: 0.05em;
    transition: all 0.2s;
}
.top-btn:hover {
    background: rgba(244, 236, 225, 0.08);
    border-color: rgba(200, 185, 155, 0.4);
    color: var(--paper-base);
}
.font-size-controls {
    display: flex;
    align-items: center;
    gap: 2px;
    margin-right: 4px;
}
.font-size-controls .top-btn {
    padding: 5px 9px;
    font-size: 0.85rem;
    font-weight: 600;
}
.font-size-label {
    color: var(--ink-faint);
    font-size: 0.7rem;
    min-width: 28px;
    text-align: center;
    letter-spacing: 0.04em;
}

/* ===== THE BOOK ===== */
.book {
    flex: 1;
    width: 100%;
    max-width: 920px;
    min-height: 0;
    display: flex;
    position: relative;
    perspective: 1800px;
    margin: 0 auto;
}
.page-spread {
    display: flex;
    width: 100%;
    height: 100%;
    position: relative;
    border-radius: 3px;
    overflow: hidden;
    box-shadow:
        0 8px 30px rgba(0, 0, 0, 0.4),
        0 2px 8px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(0, 0, 0, 0.08);
}
.page {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--paper-base);
    background-image:
        radial-gradient(
            ellipse at 25% 15%,
            rgba(218, 198, 168, 0.18) 0%,
            transparent 45%
        ),
        radial-gradient(
            ellipse at 75% 85%,
            rgba(210, 190, 158, 0.14) 0%,
            transparent 45%
        ),
        radial-gradient(
            ellipse at 60% 30%,
            rgba(225, 210, 185, 0.08) 0%,
            transparent 35%
        ),
        radial-gradient(
            ellipse at 15% 70%,
            rgba(215, 195, 165, 0.1) 0%,
            transparent 40%
        );
}
.paper-texture-layer {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    opacity: 1;
    mix-blend-mode: multiply;
}
/* Noise overlay — z-index 1, BELOW content */
.page::after {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='256' height='256' filter='url(%23noise)' opacity='0.06'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 256px 256px;
    mix-blend-mode: multiply;
    opacity: 0.5;
}
.page.left {
    box-shadow: inset -30px 0 40px -20px var(--gutter-shadow);
}
.page.right {
    box-shadow: inset 30px 0 40px -20px var(--gutter-shadow);
}

.spine-line {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(
        to bottom,
        var(--paper-shadow),
        var(--paper-crease) 20%,
        var(--paper-crease) 80%,
        var(--paper-shadow)
    );
    z-index: 10;
    transform: translateX(-50%);
    box-shadow:
        -3px 0 8px rgba(44, 36, 22, 0.08),
        3px 0 8px rgba(44, 36, 22, 0.08);
}
/* Edge darkening — z-index 1, BELOW content */
.page::before {
    content: "";
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 1;
    background:
        radial-gradient(
            ellipse at 0% 0%,
            rgba(180, 160, 130, 0.12) 0%,
            transparent 30%
        ),
        radial-gradient(
            ellipse at 100% 100%,
            rgba(180, 160, 130, 0.1) 0%,
            transparent 30%
        ),
        radial-gradient(
            ellipse at 50% 0%,
            rgba(170, 150, 120, 0.06) 0%,
            transparent 40%
        ),
        radial-gradient(
            ellipse at 50% 100%,
            rgba(170, 150, 120, 0.06) 0%,
            transparent 40%
        );
}

/* Page content — z-index 2, ABOVE texture overlays */
.page-content {
    position: absolute;
    inset: 0;
    overflow: hidden;
    z-index: 2;
    scrollbar-width: none;
    scrollbar-color: transparent transparent;
}
.page-viewport {
    position: absolute;
    left: 52px;
    right: 52px;
    top: 72px;
    bottom: 90px;
    overflow: hidden;
}
.page.left .page-viewport {
    right: 40px;
}
.page.right .page-viewport {
    left: 40px;
}
.page-content::-webkit-scrollbar {
    width: 0;
    height: 0;
}
.page-content::-webkit-scrollbar-track {
    background: transparent;
}
.page-content::-webkit-scrollbar-thumb {
    background: var(--paper-crease);
    border-radius: 2px;
}

/* Content typography */
.page-content h1,
.page-content h2,
.page-content h3 {
    font-family: "Cormorant Garamond", serif;
    color: var(--ink-primary);
    margin: 1.5em 0 0.6em;
    line-height: 1.25;
}
.page-content h1 {
    font-size: 1.7em;
    font-weight: 500;
}
.page-content h2 {
    font-size: 1.35em;
    font-weight: 500;
}
.page-content h3 {
    font-size: 1.1em;
    font-weight: 600;
}
.page-content h1:first-child,
.page-content h2:first-child,
.page-content h3:first-child {
    margin-top: 0;
}

.page-content p {
    font-family: "Crimson Pro", serif;
    font-size: 1.05em;
    line-height: 1.78;
    color: var(--ink-secondary);
    margin-bottom: 0.9em;
    text-align: justify;
    hyphens: auto;
    text-indent: 1.5em;
}
.page-content p:first-child {
    text-indent: 0;
}
.page-content p.drop-cap {
    text-indent: 0;
}
.page-content p.drop-cap::first-letter {
    font-family: "Cormorant Garamond", serif;
    font-size: 3.2em;
    float: left;
    line-height: 0.8;
    margin: 0.05em 0.1em 0 0;
    color: var(--ink-primary);
    font-weight: 600;
}
.page-content em,
.page-content i {
    font-style: italic;
    color: var(--ink-primary);
}
.page-content strong,
.page-content b {
    font-weight: 600;
    color: var(--ink-primary);
}
.page-content blockquote {
    border-left: 2px solid var(--paper-crease);
    padding-left: 1.2em;
    margin: 1.2em 0;
    color: var(--ink-light);
    font-style: italic;
}
.page-content a {
    color: var(--accent-red);
    text-decoration: none;
    border-bottom: 1px solid rgba(139, 58, 58, 0.3);
}
.page-content img {
    max-width: 100%;
    height: auto;
    border-radius: 2px;
    margin: 1em 0;
    display: block;
}
.page-content svg {
    max-width: 100%;
    height: auto;
}

.page-flow {
    position: relative;
    height: 100%;
    column-width: var(--page-width, 320px);
    column-gap: 0;
    column-fill: auto;
    transform: translateX(0);
    will-change: transform;
}
.page-flow p {
    orphans: 2;
    widows: 2;
}
.page-flow h1,
.page-flow h2,
.page-flow h3,
.page-flow blockquote,
.page-flow img,
.page-flow svg,
.page-flow figure,
.page-flow table,
.page-flow pre {
    break-inside: avoid;
    page-break-inside: avoid;
}
.page-flow img,
.page-flow svg {
    max-height: var(--page-usable-height, 100%);
    object-fit: contain;
}

/* Cover display */
.cover-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100%;
    width: 100%;
    padding: 24px;
    text-align: center;
}
.cover-display img {
    max-width: 85%;
    max-height: 65vh;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 3px;
    box-shadow:
        0 2px 12px rgba(44, 36, 22, 0.15),
        0 1px 3px rgba(44, 36, 22, 0.1);
}
.cover-display .cover-title {
    font-family: "Cormorant Garamond", serif;
    font-size: 1.3em;
    font-weight: 500;
    color: var(--ink-primary);
    margin-top: 1.2em;
    line-height: 1.3;
    max-width: 90%;
}
.cover-display .cover-author {
    font-family: "Crimson Pro", serif;
    font-size: 0.95em;
    color: var(--ink-light);
    margin-top: 0.4em;
    font-style: italic;
    letter-spacing: 0.03em;
}
.page-content.is-cover {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    overflow: hidden;
}

/* Page number */
.page-number {
    position: absolute;
    bottom: 22px;
    font-family: "Cormorant Garamond", serif;
    font-size: 0.8rem;
    color: var(--ink-faint);
    z-index: 5;
    letter-spacing: 0.1em;
}
.page.left .page-number {
    left: 52px;
}
.page.right .page-number {
    right: 52px;
}

/* Navigation */
.nav-zone {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 80px;
    z-index: 10;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s;
}
.nav-zone:hover {
    opacity: 1;
}
.nav-zone.prev {
    left: 0;
}
.nav-zone.next {
    right: 0;
}
.nav-arrow {
    width: 28px;
    height: 28px;
    stroke: var(--ink-faint);
    stroke-width: 1.5;
    fill: none;
}

/* Bottom bar */
.bottom-bar {
    width: 100%;
    max-width: 920px;
    padding: 10px 0 4px;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}
.progress-bar {
    flex: 1;
    height: 2px;
    background: rgba(200, 185, 155, 0.15);
    border-radius: 1px;
    overflow: hidden;
    cursor: pointer;
}
.progress-fill {
    height: 100%;
    background: var(--paper-crease);
    border-radius: 1px;
    transition: width 0.3s ease;
}
.progress-label {
    font-size: 0.7rem;
    color: var(--ink-faint);
    letter-spacing: 0.08em;
    white-space: nowrap;
    min-width: 80px;
    text-align: right;
}

/* TOC Panel */
.toc-panel {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 340px;
    background: var(--paper-warm);
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 0.35s ease;
    box-shadow: 4px 0 30px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
}
.toc-panel.open {
    transform: translateX(0);
}
.toc-header {
    padding: 28px 28px 16px;
    border-bottom: 1px solid var(--paper-crease);
}
.toc-header h2 {
    font-family: "Cormorant Garamond", serif;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--ink-primary);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}
.toc-list {
    flex: 1;
    overflow-y: auto;
    padding: 16px 0;
}
.toc-item {
    padding: 10px 28px;
    cursor: pointer;
    font-family: "Crimson Pro", serif;
    font-size: 0.92rem;
    color: var(--ink-secondary);
    transition: all 0.2s;
    line-height: 1.4;
}
.toc-item:hover {
    background: rgba(201, 184, 153, 0.2);
    color: var(--ink-primary);
}
.toc-item.active {
    color: var(--accent-red);
    background: rgba(139, 58, 58, 0.06);
}
.toc-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.35s;
}
.toc-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

/* Animations */
.page-turn {
    animation: pageTurn 0.35s ease;
}
@keyframes pageTurn {
    0% {
        opacity: 0.5;
        transform: translateX(10px);
    }
    100% {
        opacity: 1;
        transform: translateX(0);
    }
}
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Loading */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(44, 36, 22, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}
.loading-overlay.active {
    opacity: 1;
    pointer-events: auto;
}
.loading-text {
    font-family: "Cormorant Garamond", serif;
    font-size: 1.2rem;
    color: var(--paper-shadow);
    letter-spacing: 0.2em;
    animation: pulse 1.5s ease infinite;
}
@keyframes pulse {
    0%,
    100% {
        opacity: 0.5;
    }
    50% {
        opacity: 1;
    }
}

/* Responsive */
@media (max-width: 768px) {
    .sample-books {
        gap: 16px;
        margin-bottom: 1.5rem;
    }
    .sample-cover {
        width: 75px;
        height: 105px;
    }
    .sample-label {
        font-size: 0.65rem;
        max-width: 85px;
    }
    .page-spread {
        flex-direction: column;
    }
    .spine-line {
        display: none;
    }
    .page.left,
    .page.right {
        box-shadow: none;
    }
    .page-viewport {
        left: 28px;
        right: 28px;
        top: 52px;
        bottom: 78px;
    }
    .page.left .page-viewport,
    .page.right .page-viewport {
        left: 28px;
        right: 28px;
    }
    .page.left .page-number {
        left: 28px;
    }
    .page.right .page-number {
        right: 28px;
    }
    .page.right {
        display: none;
    }
    .upload-screen h1 {
        font-size: 2.2rem;
    }
    .book-title-display {
        max-width: 200px;
        font-size: 0.75rem;
    }
    .top-btn {
        padding: 4px 8px;
        font-size: 0.72rem;
    }
}

/* ===== BOOKMARKS ===== */
.bookmark-ribbon {
    position: absolute;
    top: 0;
    right: 36px;
    width: 18px;
    height: 44px;
    background: var(--accent-red);
    clip-path: polygon(0 0, 100% 0, 100% 100%, 50% 78%, 0 100%);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.25);
    z-index: 6;
    opacity: 0;
    transform: translateY(-12px);
    transition:
        opacity 0.25s,
        transform 0.25s;
    pointer-events: none;
}
.bookmark-ribbon.visible {
    opacity: 1;
    transform: translateY(0);
}
.bookmark-btn {
    display: flex;
    align-items: center;
    padding: 4px 8px;
}
.bookmark-btn svg {
    width: 16px;
    height: 16px;
    fill: none;
    stroke: currentColor;
    transition: fill 0.2s;
}
.top-btn.bookmarked {
    color: var(--accent-red);
    border-color: var(--accent-red);
}
.top-btn.bookmarked svg {
    fill: currentColor;
}
.bookmarks-header {
    border-top: 1px solid var(--paper-crease);
}
.bookmark-list {
    max-height: 35%;
    overflow-y: auto;
    padding: 12px 0;
}
.bookmark-empty {
    padding: 10px 28px;
    font-family: "Crimson Pro", serif;
    font-style: italic;
    font-size: 0.88rem;
    color: var(--ink-faint);
}
.bookmark-item {
    display: flex;
    align-items: center;
    gap: 8px;
}
.bookmark-item .toc-item {
    flex: 1;
    padding-right: 0;
}
.bookmark-page {
    color: var(--ink-faint);
    font-size: 0.8rem;
}
.bookmark-remove {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--ink-faint);
    font-size: 1.1rem;
    padding: 4px 24px 4px 8px;
}
.bookmark-remove:hover {
    color: var(--accent-red);
}