:root {
    --gold: #C9A227;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background:
        radial-gradient(circle at top, rgba(201, 162, 39, 0.16), transparent 34%),
        linear-gradient(180deg, #080d17 0%, #0c1322 55%, #080d17 100%);
}

.heading-serif {
    font-family: 'Playfair Display', Georgia, serif;
    letter-spacing: -0.03em;
}

.glass-card {
    background: rgba(15, 23, 42, 0.76);
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 24px 80px rgba(2, 6, 23, 0.28);
    backdrop-filter: blur(16px);
}

.dropzone-active {
    border-color: rgba(201, 162, 39, 0.72);
    background: rgba(201, 162, 39, 0.08);
}

#dropzone.has-file {
    border-style: solid;
    border-color: rgba(52, 211, 153, 0.45);
    background: rgba(16, 185, 129, 0.08);
}

#dropzone.has-file.dropzone-active {
    border-color: rgba(201, 162, 39, 0.72);
    background: rgba(201, 162, 39, 0.08);
}

/*
 * Edit pane mirrors the EPUB body CSS. Device mode uses the separate,
 * paginated physical-scale simulator below.
 */
#previewWrap {
    padding: 0.65rem;
    border-radius: 1.25rem;
    background: rgba(2, 6, 23, 0.42);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

#previewWrap.mode-view {
    padding: 0;
    background: transparent;
    box-shadow: none;
}

#preview {
    outline: none;
    background: #f4f1e8;
    color: #111;
    font-family: Georgia, "Times New Roman", Times, serif;
    font-size: 1.02rem;
    line-height: 1.55;
    -webkit-hyphens: auto;
    hyphens: auto;
    border: 1px solid #bdb7a8;
    border-radius: 2px;
    box-shadow: inset 0 0 48px rgba(40, 35, 20, 0.06);
}

#preview > :first-child {
    margin-top: 0;
}

#preview p {
    margin: 0 0 0.85em;
    color: #111;
    line-height: 1.55;
    text-align: justify;
    page-break-inside: auto;
}

#preview p.preserve-structure {
    white-space: pre-wrap;
    font-family: Georgia, "Times New Roman", Times, serif;
    font-size: 0.98rem;
    line-height: 1.5;
    text-align: left;
}

#preview h1,
#preview h2,
#preview h3,
#preview h4 {
    font-family: Georgia, "Times New Roman", Times, serif;
    color: #111;
    letter-spacing: 0;
    font-weight: 700;
    line-height: 1.25;
    margin: 1.25em 0 0.55em;
}

#preview h1 { font-size: 1.45em; }
#preview h2 { font-size: 1.22em; }
#preview h3 { font-size: 1.08em; }

#preview ul,
#preview ol {
    color: #111;
    margin: 0 0 1em 1.2em;
}

#preview li {
    margin: 0.25em 0;
    color: #111;
}

#preview blockquote {
    border-left: 0.25em solid #888;
    padding-left: 1em;
    color: #333;
    margin: 0 0 1em;
}

#preview table.kobo-table,
#preview table {
    width: 100%;
    border-collapse: collapse;
    margin: 1em 0;
    font-size: 0.88em;
    color: #111;
    box-shadow: none;
    border-radius: 0;
    overflow: visible;
    page-break-inside: auto;
}

#preview th,
#preview td {
    border: 1px solid #555;
    padding: 5px 7px;
    text-align: left;
    vertical-align: top;
    color: #111;
}

#preview th {
    background: #eee;
    color: #111;
    font-weight: 700;
}

#preview tr:nth-child(even) td {
    background: transparent;
}

#preview img {
    max-width: 100%;
    height: auto;
}

#preview code {
    font-family: monospace;
    font-size: 0.92em;
}

/* Edit-only chrome (not on device). Hidden in pure View. */
#preview .kf-page-label {
    display: block;
    margin: 1.1em 0 0.55em;
    padding: 0.15em 0;
    border: 0;
    border-top: 1px dashed #999;
    border-radius: 0;
    background: transparent;
    color: #555;
    font-family: Georgia, "Times New Roman", Times, serif;
    font-size: 0.72rem;
    font-weight: 400;
    letter-spacing: 0.04em;
    text-transform: none;
    user-select: none;
}

#preview .kf-chapter-marker {
    display: block;
    margin: 1.25em 0 0.4em;
    padding: 0.2em 0;
    border: 0;
    border-bottom: 1px solid #bbb;
    background: transparent;
    color: #444;
    font-family: Georgia, "Times New Roman", Times, serif;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: none;
    user-select: none;
}

/* View = export body only (no page/chapter chrome) */
#previewWrap.mode-view #preview .kf-page-label,
#previewWrap.mode-view #preview .kf-chapter-marker {
    display: none !important;
}

#preview.kf-editing {
    box-shadow:
        inset 0 0 48px rgba(40, 35, 20, 0.06),
        inset 0 0 0 2px rgba(201, 162, 39, 0.55);
}

#preview.kf-editing:focus {
    box-shadow:
        inset 0 0 48px rgba(40, 35, 20, 0.06),
        inset 0 0 0 2px rgba(201, 162, 39, 0.85);
}

#preview .kf-empty-hint {
    color: #666;
    text-align: left;
    font-style: italic;
}

/* Device-accurate screen/body ratios with paginated EPUB flow */
#devicePreview {
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 1.5rem;
    background:
        radial-gradient(circle at 50% 18%, rgba(201, 162, 39, 0.1), transparent 32%),
        rgba(2, 6, 23, 0.5);
    overflow: hidden;
}

.device-control {
    min-width: 0;
}

.device-control select,
.device-control input[type="range"] {
    width: 100%;
}

.device-stage {
    min-height: 610px;
    display: grid;
    place-items: center;
    padding: 2rem 1rem 1.25rem;
    overflow: auto;
}

#deviceFrame {
    position: relative;
    width: min(var(--device-css-width, 360px), 100%);
    flex: none;
    border-radius: var(--device-radius, 12px);
    background:
        linear-gradient(145deg, rgba(76, 76, 76, 0.96), rgba(17, 17, 17, 0.99) 48%, rgba(52, 52, 52, 0.98));
    box-shadow:
        0 2px 1px rgba(255, 255, 255, 0.1) inset,
        0 -2px 2px rgba(0, 0, 0, 0.45) inset,
        0 28px 65px rgba(0, 0, 0, 0.48);
    transition: width 0.2s ease, aspect-ratio 0.2s ease;
}

#deviceFrame::after {
    content: "kobo";
    position: absolute;
    left: 50%;
    bottom: 2.1%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.5);
    font-family: Georgia, serif;
    font-size: clamp(8px, 1.35vw, 12px);
    letter-spacing: 0.08em;
    pointer-events: none;
}

#deviceFrame.has-grip::after {
    left: auto;
    right: 7%;
    bottom: 4%;
    transform: none;
}

#deviceFrame.orientation-landscape::after {
    left: 50%;
    right: auto;
    bottom: 2%;
    transform: translateX(-50%);
}

#deviceScreen {
    position: absolute;
    overflow: hidden;
    border: 1px solid rgba(22, 22, 18, 0.9);
    border-radius: 2px;
    background: #f4f1e8;
    color: #111;
    box-shadow:
        inset 0 0 28px rgba(49, 43, 26, 0.08),
        0 0 0 1px rgba(255, 255, 255, 0.06);
}

#deviceFrame.is-colour #deviceScreen {
    background:
        linear-gradient(rgba(247, 243, 231, 0.84), rgba(247, 243, 231, 0.84)),
        repeating-linear-gradient(0deg, rgba(60, 120, 160, 0.025) 0 1px, transparent 1px 3px);
}

#deviceReaderHeader,
#deviceReaderFooter {
    position: absolute;
    left: var(--reader-margin, 18px);
    right: var(--reader-margin, 18px);
    z-index: 2;
    overflow: hidden;
    color: #625f56;
    font-family: Arial, sans-serif;
    font-size: var(--reader-chrome-size, 7px);
    line-height: 1;
    text-overflow: ellipsis;
    white-space: nowrap;
    pointer-events: none;
}

#deviceReaderHeader {
    top: var(--reader-chrome-offset, 9px);
    text-align: center;
}

#deviceReaderFooter {
    bottom: var(--reader-chrome-offset, 9px);
    text-align: center;
}

#deviceBookViewport {
    position: absolute;
    top: var(--reader-content-top, 20px);
    right: var(--reader-margin, 18px);
    bottom: var(--reader-content-bottom, 20px);
    left: var(--reader-margin, 18px);
    overflow: hidden;
}

#deviceBookContent {
    height: 100%;
    width: 100%;
    color: #111;
    font-family: Georgia, "Times New Roman", Times, serif;
    line-height: var(--reader-line-height, 1.5);
    column-fill: auto;
    column-gap: 0;
    overflow: visible;
    transform: translate3d(0, 0, 0);
    transition: transform 0.14s ease-out;
    -webkit-hyphens: auto;
    hyphens: auto;
}

#deviceBookContent > :first-child {
    margin-top: 0;
}

#deviceBookContent p {
    margin: 0 0 0.82em;
    line-height: inherit;
    text-align: justify;
}

#deviceBookContent p.preserve-structure {
    white-space: normal;
    text-align: left;
}

#deviceBookContent h1,
#deviceBookContent h2,
#deviceBookContent h3,
#deviceBookContent h4 {
    margin: 1.15em 0 0.52em;
    color: #111;
    font-family: Georgia, "Times New Roman", Times, serif;
    font-weight: 700;
    line-height: 1.22;
    break-inside: auto;
}

#deviceBookContent h1 { font-size: 1.45em; }
#deviceBookContent h2 { font-size: 1.22em; }
#deviceBookContent h3 { font-size: 1.08em; }

#deviceBookContent ul,
#deviceBookContent ol {
    margin: 0 0 1em 1.15em;
    padding-left: 0.4em;
}

#deviceBookContent li {
    margin: 0.24em 0;
}

#deviceBookContent blockquote {
    margin: 0 0 1em;
    padding-left: 0.9em;
    border-left: 0.22em solid #888;
    color: #333;
}

#deviceBookContent table {
    width: 100%;
    margin: 0.9em 0;
    border-collapse: collapse;
    font-size: 0.82em;
    break-inside: auto;
}

#deviceBookContent th,
#deviceBookContent td {
    padding: 0.3em 0.4em;
    border: 1px solid #555;
    text-align: left;
    vertical-align: top;
}

#deviceBookContent img {
    max-width: 100%;
    max-height: 95%;
    height: auto;
    object-fit: contain;
}

#devicePagePrev,
#devicePageNext {
    min-width: 7rem;
}

.device-spec-pill {
    border: 1px solid rgba(255, 255, 255, 0.09);
    background: rgba(15, 23, 42, 0.7);
}

/* Standalone image converter */
#imageDropzone.is-active {
    border-color: rgba(201, 162, 39, 0.72);
    background: rgba(201, 162, 39, 0.08);
}

#imageDropzone.has-image {
    border-style: solid;
    border-color: rgba(52, 211, 153, 0.42);
    background: rgba(16, 185, 129, 0.07);
}

.image-preview-shell {
    min-height: 540px;
    display: grid;
    place-items: center;
    padding: clamp(1rem, 3vw, 2.5rem);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 1.5rem;
    background:
        linear-gradient(45deg, rgba(255, 255, 255, 0.018) 25%, transparent 25% 75%, rgba(255, 255, 255, 0.018) 75%),
        rgba(2, 6, 23, 0.45);
    background-size: 22px 22px;
}

#imageOutputCanvas:not(.hidden) {
    display: block;
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 650px;
    border: 8px solid #252525;
    background: #f4f1e8;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.42);
    image-rendering: auto;
}

#imageOutputCanvas.hidden {
    display: none;
}

#imageOutputCanvas.is-dithered {
    image-rendering: pixelated;
}

@media (max-width: 767px) {
    .device-stage {
        min-height: 500px;
        padding-inline: 0.65rem;
    }

    #deviceFrame::after {
        font-size: 7px;
    }

    #devicePagePrev,
    #devicePageNext {
        min-width: 0;
    }

    .image-preview-shell {
        min-height: 390px;
    }
}

/* Inline styles (match Kobo EPUB CSS) */
#preview strong, #preview b { font-weight: 700; }
#preview em, #preview i { font-style: italic; }
#preview u { text-decoration: underline; }
#preview s, #preview strike { text-decoration: line-through; }
#preview sub { font-size: 0.75em; vertical-align: sub; }
#preview sup { font-size: 0.75em; vertical-align: super; }

/* Mobile-first formatting toolbar */
#editToolbar {
    position: sticky;
    bottom: 0.5rem;
    z-index: 20;
    gap: 0.45rem;
    padding: 0.55rem;
    border-radius: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(8, 13, 23, 0.94);
    backdrop-filter: blur(12px);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
}

#editToolbar .tb-row {
    display: flex;
    flex-wrap: nowrap;
    gap: 0.35rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 0.1rem;
}

#editToolbar .tb-row::-webkit-scrollbar {
    display: none;
}

#editToolbar .tb-label {
    flex-shrink: 0;
    align-self: center;
    margin-right: 0.15rem;
    font-size: 0.58rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: #64748b;
}

#editToolbar .tb-btn {
    flex-shrink: 0;
    min-width: 2.6rem;
    min-height: 2.6rem;
    padding: 0.4rem 0.65rem;
    border-radius: 0.75rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.05);
    color: #e2e8f0;
    font-size: 0.8rem;
    font-weight: 600;
    line-height: 1;
    transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

#editToolbar .tb-btn:hover,
#editToolbar .tb-btn:focus-visible {
    border-color: rgba(201, 162, 39, 0.45);
    color: #f8fafc;
    outline: none;
}

#editToolbar .tb-btn.is-active {
    border-color: rgba(201, 162, 39, 0.6);
    background: rgba(201, 162, 39, 0.18);
    color: #f5d36d;
}

#editToolbar .tb-btn-wide {
    min-width: auto;
    padding-left: 0.75rem;
    padding-right: 0.75rem;
}

@media (min-width: 768px) {
    #editToolbar {
        position: static;
        bottom: auto;
        box-shadow: none;
    }

    #editToolbar .tb-row {
        flex-wrap: wrap;
        overflow: visible;
    }

    #editToolbar .tb-btn {
        min-width: 2.4rem;
        min-height: 2.25rem;
    }
}

/* Edit diff (git-like) */
#diffPanel {
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(2, 6, 23, 0.65);
}

#diffBody {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.72rem;
    line-height: 1.45;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Jump list (git-style index under Diff mode) */
#diffBody .diff-hunk {
    display: block;
    width: 100%;
    text-align: left;
    padding: 0.45rem 0.55rem;
    margin: 0.25rem 0;
    border-radius: 0.5rem;
    border: 1px solid rgba(255, 255, 255, 0.08);
    background: rgba(15, 23, 42, 0.55);
    line-height: 1.65;
    cursor: pointer;
    transition: border-color 0.15s ease, background 0.15s ease;
}

#diffBody .diff-hunk:hover,
#diffBody .diff-hunk:focus-visible {
    border-color: rgba(201, 162, 39, 0.45);
    background: rgba(201, 162, 39, 0.08);
    outline: none;
}

#diffBody .diff-hunk.is-active {
    border-color: rgba(201, 162, 39, 0.65);
    box-shadow: inset 2px 0 0 #C9A227;
}

#diffBody .diff-w-add {
    display: inline;
    padding: 0.05rem 0.2rem;
    margin: 0 0.05rem;
    border-radius: 0.25rem;
    background: rgba(34, 197, 94, 0.22);
    color: #86efac;
    font-weight: 600;
}

#diffBody .diff-w-del {
    display: inline;
    padding: 0.05rem 0.2rem;
    margin: 0 0.05rem;
    border-radius: 0.25rem;
    background: rgba(244, 63, 94, 0.18);
    color: #fda4af;
    font-weight: 600;
    text-decoration: line-through;
    text-decoration-color: rgba(253, 164, 175, 0.55);
}

#diffBody .diff-w-ctx {
    color: #94a3b8;
}

#diffBody .diff-w-sep {
    color: #475569;
    margin: 0 0.15rem;
}

#diffBody .diff-meta {
    color: #64748b;
    padding: 0.35rem 0.4rem;
    font-size: 0.68rem;
}

#diffBody .diff-h-tag {
    display: inline-block;
    margin-right: 0.3rem;
    padding: 0.05rem 0.35rem;
    border-radius: 0.3rem;
    border: 1px solid rgba(201, 162, 39, 0.35);
    background: rgba(201, 162, 39, 0.12);
    color: #e8d48b;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    vertical-align: 0.05em;
}

/* Google Docs–style track changes in Diff mode main view */
#previewWrap.mode-diff #preview {
    /* still Kobo paper, but annotations visible */
}

#preview .kf-tc-del,
#preview del.kf-tc-del {
    background: rgba(220, 38, 38, 0.14);
    color: #9f1239;
    text-decoration: line-through;
    text-decoration-thickness: 1.5px;
    text-decoration-color: #e11d48;
    padding: 0 0.12em;
    border-radius: 0.15em;
}

#preview .kf-tc-ins,
#preview ins.kf-tc-ins {
    background: rgba(22, 163, 74, 0.18);
    color: #14532d;
    text-decoration: none;
    padding: 0 0.12em;
    border-radius: 0.15em;
    font-weight: 600;
}

#preview .kf-tc-block.is-flash {
    outline: 2px solid rgba(201, 162, 39, 0.85);
    outline-offset: 3px;
    transition: outline-color 0.8s ease;
}

#preview .kf-tc-empty {
    color: #666;
    font-style: italic;
}

.mode-btn.active {
    background: rgba(201, 162, 39, 0.2);
    border-color: rgba(201, 162, 39, 0.55);
    color: #f8fafc;
}

#chapterOutline button.active {
    border-color: rgba(201, 162, 39, 0.5);
    background: rgba(201, 162, 39, 0.12);
    color: #f8fafc;
}

#bodyHtmlSource {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.8rem;
    line-height: 1.5;
    tab-size: 2;
}

.diag-warn {
    border-left: 3px solid rgba(251, 191, 36, 0.8);
}

.diag-info {
    border-left: 3px solid rgba(148, 163, 184, 0.6);
}

.diag-ok {
    border-left: 3px solid rgba(52, 211, 153, 0.7);
}

:root { --gold: #C9A227; --gold-hover: #E8C547; --ink: #0A0F1C; }
a { color: var(--gold) !important; text-decoration: none; transition: color .15s ease; }
a:hover, a:focus-visible { color: var(--gold-hover) !important; }
a.btn-solid, a.btn-solid:hover { color: var(--ink) !important; }