/* ============================================================
   Book Viewer Plugin - book-viewer.css
   ============================================================ */

/* Wrapper — shrinks to fit the book, not a fixed box */
.bvp-wrapper {
    position: relative;
    display: inline-flex;       /* shrink-wrap to content width */
    flex-direction: column;
    width: 100%;                /* still respects the configured width */
    max-width: 100%;
    overflow: hidden;
    border-radius: 4px;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    box-sizing: border-box;
}

/* ── Toolbar ── */
.bvp-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(10, 10, 10, 0.80);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding: 4px 10px;
    gap: 4px;
    flex-shrink: 0;
    flex-wrap: wrap;
    z-index: 10;
    width: 100%;
    box-sizing: border-box;
}

.bvp-toolbar-left,
.bvp-toolbar-right,
.bvp-toolbar-center {
    display: flex;
    align-items: center;
    gap: 2px;
}

.bvp-toolbar-center {
    flex: 1;
    justify-content: center;
    gap: 6px;
}

.bvp-btn {
    background: transparent;
    color: rgba(255,255,255,0.70);
    border: none;
    border-radius: 4px;
    padding: 4px 9px;
    cursor: pointer;
    font-size: 15px;
    line-height: 1.3;
    transition: background 0.12s, color 0.12s;
    white-space: nowrap;
    user-select: none;
}
.bvp-btn:hover {
    background: rgba(255,255,255,0.10);
    color: #fff;
}
.bvp-btn:active { background: rgba(255,255,255,0.16); }
.bvp-btn:disabled { opacity: 0.30; cursor: default; }

.bvp-page-input {
    width: 80px;
    text-align: center;
    background: rgba(255,255,255,0.09);
    border: 1px solid rgba(255,255,255,0.18);
    border-radius: 4px;
    color: #fff;
    padding: 3px 8px;
    font-size: 13px;
    transition: border-color 0.15s, background 0.15s;
}
.bvp-page-input::placeholder { color: rgba(255,255,255,0.35); }
.bvp-page-input:focus {
    outline: none;
    border-color: rgba(255,255,255,0.50);
    background: rgba(255,255,255,0.14);
}

.bvp-page-total {
    color: rgba(255,255,255,0.45);
    font-size: 12px;
    white-space: nowrap;
    letter-spacing: 0.02em;
}

.bvp-zoom-label {
    color: rgba(255,255,255,0.55);
    font-size: 12px;
    min-width: 36px;
    text-align: center;
}

.bvp-toolbar-divider {
    width: 1px;
    height: 18px;
    background: rgba(255,255,255,0.12);
    margin: 0 4px;
    flex-shrink: 0;
}

/* ── Book Area — sizes itself to the rendered canvases ── */
.bvp-book-area {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding: 20px 16px;
    box-sizing: border-box;
    width: 100%;
    overflow-x: auto;
    overflow-y: visible;
    position: relative; /* allows flip container to position relative to this */
}

.bvp-book-spread {
    display: flex;
    gap: 0;
    align-items: flex-start;
    justify-content: center;
    position: relative;
}

/* Page wrappers */
.bvp-page-wrapper {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.bvp-page-wrapper.bvp-page-left  { border-radius: 4px 0 0 4px; }
.bvp-page-wrapper.bvp-page-right { border-radius: 0 4px 4px 0; }

.bvp-page-wrapper.bvp-hidden { display: none; }

/* Canvases */
.bvp-canvas {
    display: block;
    /* No max-width — the JS controls the size; constraining here fights the scale calc */
}

.bvp-shadow .bvp-canvas {
    box-shadow: -6px 0 18px rgba(0,0,0,0.45), 6px 0 18px rgba(0,0,0,0.45);
}

/* Page number badges */
.bvp-page-num {
    color: rgba(255,255,255,0.55);
    font-size: 11px;
    margin-top: 6px;
    text-align: center;
    min-height: 16px;
    letter-spacing: 0.03em;
}

/* Spine line between pages */
.bvp-book-spread.bvp-dual::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 2px;
    background: linear-gradient(to bottom, transparent, rgba(0,0,0,0.35) 15%, rgba(0,0,0,0.35) 85%, transparent);
    pointer-events: none;
    z-index: 2;
}

/* ── Loading Overlay ── */
.bvp-loading {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.65);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 50;
    gap: 14px;
    transition: opacity 0.3s;
    min-height: 120px;
}
.bvp-loading.bvp-loaded {
    opacity: 0;
    pointer-events: none;
}

/* Loading placeholder so wrapper has height before first render */
.bvp-book-area.bvp-loading-placeholder {
    min-height: 200px;
}

.bvp-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.2);
    border-top-color: #fff;
    border-radius: 50%;
    animation: bv-spin 0.7s linear infinite;
}
@keyframes bv-spin { to { transform: rotate(360deg); } }

.bvp-loading-text {
    color: #ddd;
    font-size: 14px;
}

/* ── Side Navigation Zones ── */
.bvp-nav-zone {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 20%;
    z-index: 25;
    cursor: pointer;
    display: flex;
    align-items: center;
    background: transparent;
    transition: background 0.25s;
    pointer-events: auto;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}
.bvp-nav-prev {
    left: 0;
    justify-content: flex-start;
    padding-left: 10px;
}
.bvp-nav-next {
    right: 0;
    justify-content: flex-end;
    padding-right: 10px;
}
.bvp-nav-zone:hover {
    background: rgba(255, 255, 255, 0.04);
}
.bvp-nav-zone:active {
    background: rgba(255, 255, 255, 0.07);
}

.bvp-nav-zone:focus,
.bvp-nav-zone:focus-visible {
    outline: none;
}

.bvp-nav-arrow {
    font-size: 120px;
    font-weight: 100;
    color: rgba(255, 255, 255, 0.28);
    line-height: 1;
    transition: color 0.2s, transform 0.18s;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.65);
    pointer-events: none;
}
.bvp-nav-zone:hover .bvp-nav-arrow {
    color: rgba(255, 255, 255, 0.62);
    transform: scale(1.1);
}
.bvp-nav-zone:active .bvp-nav-arrow {
    color: rgba(255, 255, 255, 0.85);
    transform: scale(0.90);
}

/* Hide nav zone when there's nowhere to go */
.bvp-nav-zone.bvp-nav-hidden {
    opacity: 0;
    pointer-events: none;
    cursor: default;
}

/* ── Responsive ── */
@media (max-width: 600px) {
    .bvp-toolbar { padding: 3px 6px; gap: 2px; }
    .bvp-book-area { padding: 10px 8px; }
    .bvp-btn { padding: 4px 7px; font-size: 14px; }
    .bvp-page-input { width: 62px; }
    .bvp-nav-zone { width: 25%; }
    .bvp-nav-arrow { font-size: 88px; color: rgba(255,255,255,0.32); }
}

/* ============================================================
   Page Flip Animation
   ============================================================ */

/* Container: absolute over book-area, sized and positioned by JS */
.bvp-flip-container {
    position: absolute;
    pointer-events: none;
    perspective: 1800px;
    z-index: 30;
    display: none;
    overflow: visible;
}
.bvp-flip-container.bvp-flipping {
    display: block;
}

/* The card that rotates — JS sets left/width/transform-origin per direction */
.bvp-flip-card {
    position: absolute;
    top: 0;
    height: 100%;
    transform-style: preserve-3d;
    will-change: transform;
}

/* Front and back faces */
.bvp-flip-front,
.bvp-flip-back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    overflow: hidden;
    border-radius: 1px;
}

.bvp-flip-front {
    transform: rotateY(0deg);
    background: #fff;
}
.bvp-flip-back {
    transform: rotateY(180deg);
    background: #fff;
}

/* Directional shadow for depth */
.bvp-flip-front::after,
.bvp-flip-back::after {
    content: '';
    position: absolute;
    inset: 0;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s;
}
.bvp-flip-card.bvp-flip-forward .bvp-flip-front::after {
    background: linear-gradient(to left, rgba(0,0,0,0.22) 0%, transparent 70%);
}
.bvp-flip-card.bvp-flip-forward .bvp-flip-back::after {
    background: linear-gradient(to right, rgba(0,0,0,0.18) 0%, transparent 70%);
}
.bvp-flip-card.bvp-flip-backward .bvp-flip-front::after {
    background: linear-gradient(to right, rgba(0,0,0,0.22) 0%, transparent 70%);
}
.bvp-flip-card.bvp-flip-backward .bvp-flip-back::after {
    background: linear-gradient(to left, rgba(0,0,0,0.18) 0%, transparent 70%);
}
.bvp-flip-card.bvp-shadow-active .bvp-flip-front::after,
.bvp-flip-card.bvp-shadow-active .bvp-flip-back::after {
    opacity: 1;
}

/* Animations — forward flips left, backward flips right */
@keyframes bvp-flip-forward {
    0%   { transform: rotateY(0deg); }
    100% { transform: rotateY(-180deg); }
}
@keyframes bvp-flip-backward {
    0%   { transform: rotateY(0deg); }
    100% { transform: rotateY(180deg); }
}

.bvp-flip-card.bvp-flip-forward {
    animation: bvp-flip-forward 0.5s cubic-bezier(0.4, 0.0, 0.2, 1.0) forwards;
}
.bvp-flip-card.bvp-flip-backward {
    animation: bvp-flip-backward 0.5s cubic-bezier(0.4, 0.0, 0.2, 1.0) forwards;
}

/* Canvases inside flip faces */
.bvp-flip-front canvas,
.bvp-flip-back  canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100% !important;
    height: 100% !important;
}