:root {
    --bg-studio: #0e1117;
    --desk-wood: radial-gradient(circle at 50% 30%, #1f242e 0%, #0d1017 75%, #080a0e 100%);
    --accent-gold: #e2b774;
    --accent-glow: rgba(226, 183, 116, 0.25);
    --text-primary: #f1f5f9;
    --text-muted: #94a3b8;
    --glass-bg: rgba(22, 27, 34, 0.78);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-user-select: none;
    user-select: none;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--desk-wood);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text-primary);
}

/* Ambient Studio Lighting */
.studio-light {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    background: radial-gradient(ellipse at 50% 40%, rgba(255, 248, 230, 0.08) 0%, rgba(0,0,0,0) 65%);
    z-index: 1;
}

/* Studio Desk Decor (Subtle Pencils & Clips on table) */
.desk-decor {
    position: fixed;
    pointer-events: none;
    z-index: 2;
    opacity: 0.35;
    transition: opacity 0.3s;
}
.decor-pen {
    bottom: 40px;
    right: 50px;
    width: 180px;
    height: 14px;
    background: linear-gradient(90deg, #1e293b, #475569 85%, #cbd5e1 90%, #0284c7 98%);
    border-radius: 7px;
    transform: rotate(-25deg);
    box-shadow: 10px 15px 25px rgba(0,0,0,0.6);
}
.decor-eraser {
    top: 60px;
    left: 70px;
    width: 48px;
    height: 28px;
    background: #e2e8f0;
    border-radius: 4px;
    transform: rotate(18deg);
    box-shadow: 5px 8px 18px rgba(0,0,0,0.5);
    border: 1px solid #cbd5e1;
}

/* App Header */
.app-header {
    position: fixed;
    top: 18px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--glass-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--glass-border);
    padding: 8px 22px;
    border-radius: 999px;
    box-shadow: var(--glass-shadow);
    z-index: 50;
    white-space: nowrap;
}

.artist-badge {
    display: flex;
    align-items: center;
    gap: 8px;
}
.artist-avatar {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: bold;
    color: white;
}
.artist-name {
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.5px;
    color: #f8fafc;
}
.header-divider {
    width: 1px;
    height: 16px;
    background: rgba(255, 255, 255, 0.15);
}
.project-title {
    font-size: 13px;
    color: var(--accent-gold);
    font-weight: 500;
}

/* Main Viewport & Stage */
.stage {
    position: absolute;
    top: 70px;
    bottom: 85px;
    left: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.book-wrapper {
    position: relative;
    max-width: 1200px;
    max-height: 850px;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    filter: drop-shadow(0 25px 45px rgba(0, 0, 0, 0.65));
}

#flipbook {
    display: none; /* Managed by StPageFlip */
}

/* Page Common Styles */
.page {
    background-color: #fbf9f4;
    overflow: hidden;
    box-shadow: inset 0 0 30px rgba(0,0,0,0.04);
}

.page-content {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    flex-direction: column;
}

/* Covers */
.page.cover-front {
    background: #14171d url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="60" height="60" opacity="0.04"><rect width="60" height="60" fill="none" stroke="%23fff" stroke-width="1"/></svg>');
    color: #f8fafc;
    border-right: 2px solid #0a0c10;
    box-shadow: inset -10px 0 25px rgba(0,0,0,0.7);
}

.cover-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 50px 40px;
    border: 2px solid rgba(226, 183, 116, 0.25);
    margin: 15px;
    border-radius: 4px;
    position: relative;
    background: linear-gradient(135deg, rgba(255,255,255,0.03) 0%, rgba(0,0,0,0.2) 100%);
}

.cover-tag {
    font-size: 11px;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--accent-gold);
    font-weight: 600;
}

.cover-main {
    text-align: center;
    margin: auto 0;
}

.cover-title {
    font-family: "Georgia", serif;
    font-size: 38px;
    letter-spacing: 2px;
    color: #ffffff;
    margin-bottom: 12px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.cover-subtitle {
    font-size: 15px;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--accent-gold);
    margin-bottom: 24px;
    font-weight: 500;
}

.cover-art-motif {
    width: 70px;
    height: 70px;
    margin: 0 auto 24px;
    border: 1px solid var(--accent-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    background: rgba(226, 183, 116, 0.08);
}

.cover-desc {
    font-size: 13px;
    color: #94a3b8;
    line-height: 1.6;
    max-width: 280px;
    margin: 0 auto;
}

.cover-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    font-size: 11px;
    letter-spacing: 1px;
    color: #64748b;
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 15px;
}

.open-hint {
    color: var(--accent-gold);
    animation: pulseHint 2s infinite ease-in-out;
}
@keyframes pulseHint {
    0%, 100% { opacity: 0.6; transform: translateX(0); }
    50% { opacity: 1; transform: translateX(4px); }
}

/* Artwork Pages */
.art-page {
    background: #fdfcf9;
    position: relative;
    width: 100%;
    height: 100%;
}

.art-page img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    pointer-events: auto;
}

/* Paper Texture & Shading Overlays */
.paper-shading-left {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 40px;
    background: linear-gradient(to left, rgba(0,0,0,0.22) 0%, rgba(0,0,0,0.05) 40%, rgba(0,0,0,0) 100%);
    pointer-events: none;
    z-index: 5;
}
.paper-shading-right {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 40px;
    background: linear-gradient(to right, rgba(0,0,0,0.22) 0%, rgba(0,0,0,0.05) 40%, rgba(0,0,0,0) 100%);
    pointer-events: none;
    z-index: 5;
}

/* Back Cover */
.page.cover-back {
    background: #14171d;
    color: #94a3b8;
    box-shadow: inset 10px 0 25px rgba(0,0,0,0.7);
}
.back-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 50px 40px;
    text-align: center;
}
.back-quote {
    font-family: "Georgia", serif;
    font-style: italic;
    font-size: 16px;
    color: #e2e8f0;
    line-height: 1.6;
    margin-top: 60px;
}
.back-meta {
    font-size: 12px;
    color: #64748b;
    line-height: 1.8;
}

/* Navigation & Controls Bar */
.bottom-controls {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--glass-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--glass-border);
    padding: 8px 18px;
    border-radius: 999px;
    box-shadow: var(--glass-shadow);
    z-index: 50;
}

.ctrl-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: #f1f5f9;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 15px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.ctrl-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.06);
}
.ctrl-btn:active {
    transform: scale(0.94);
}
.ctrl-btn.active {
    background: var(--accent-gold);
    color: #0f172a;
    border-color: var(--accent-gold);
}

.page-counter {
    font-size: 13px;
    font-weight: 500;
    color: #cbd5e1;
    min-width: 90px;
    text-align: center;
    letter-spacing: 0.5px;
}

/* Flip Arrows on Side of Screen */
.nav-arrow {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    cursor: pointer;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    z-index: 40;
    transition: all 0.2s;
}
.nav-arrow:hover {
    background: rgba(255,255,255,0.25);
    transform: translateY(-50%) scale(1.1);
}
.nav-arrow.prev { left: 24px; }
.nav-arrow.next { right: 24px; }

/* Interactive Magnifying Glass (Loupe) */
.magnifier-loupe {
    position: fixed;
    width: 220px;
    height: 220px;
    border-radius: 50%;
    border: 3px solid #ffffff;
    box-shadow: 0 15px 35px rgba(0,0,0,0.6), inset 0 0 15px rgba(0,0,0,0.2);
    pointer-events: none;
    z-index: 999;
    display: none;
    background-repeat: no-repeat;
    background-color: #fff;
    cursor: crosshair;
}
.magnifier-loupe::after {
    content: '';
    position: absolute;
    top: 15px;
    left: 25px;
    width: 50px;
    height: 30px;
    border-radius: 50%;
    background: radial-gradient(ellipse at center, rgba(255,255,255,0.6) 0%, rgba(255,255,255,0) 70%);
    transform: rotate(-30deg);
}

/* Artist Notes Slide-out Drawer */
.drawer-backdrop {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(4px);
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}
.drawer-backdrop.open {
    opacity: 1;
    pointer-events: auto;
}

.notes-drawer {
    position: fixed;
    top: 0;
    right: -480px;
    width: 440px;
    max-width: 90vw;
    height: 100%;
    background: #14171f;
    border-left: 1px solid var(--glass-border);
    box-shadow: -15px 0 40px rgba(0,0,0,0.7);
    z-index: 101;
    padding: 35px 30px;
    display: flex;
    flex-direction: column;
    transition: right 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    overflow-y: auto;
}
.notes-drawer.open {
    right: 0;
}

.drawer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 16px;
}
.drawer-title {
    font-size: 18px;
    color: var(--accent-gold);
    font-weight: 600;
}
.drawer-close {
    background: none;
    border: none;
    color: #94a3b8;
    font-size: 22px;
    cursor: pointer;
}
.drawer-close:hover { color: white; }

.note-section {
    margin-bottom: 28px;
}
.note-tag {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 4px;
    background: rgba(226, 183, 116, 0.15);
    color: var(--accent-gold);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 8px;
}
.note-h3 {
    font-size: 17px;
    color: #f8fafc;
    margin-bottom: 8px;
}
.note-p {
    font-size: 13.5px;
    color: #cbd5e1;
    line-height: 1.6;
    margin-bottom: 12px;
}
.quote-box {
    background: rgba(255,255,255,0.04);
    border-left: 3px solid var(--accent-gold);
    padding: 12px 14px;
    font-style: italic;
    color: #e2e8f0;
    font-size: 13px;
    border-radius: 0 6px 6px 0;
    margin-bottom: 12px;
}

/* Lightbox Modal (Full HD Zoom) */
.lightbox-modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.92);
    backdrop-filter: blur(8px);
    z-index: 200;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: zoom-out;
}
.lightbox-modal.open {
    display: flex;
}
.lightbox-img {
    max-width: 92vw;
    max-height: 92vh;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.8);
    transition: transform 0.2s ease;
}
.lightbox-close {
    position: absolute;
    top: 25px;
    right: 30px;
    color: white;
    font-size: 32px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 210;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .nav-arrow { display: none; }
    .app-header { padding: 6px 14px; font-size: 12px; }
    .bottom-controls { padding: 6px 12px; gap: 8px; }
    .ctrl-btn { width: 34px; height: 34px; font-size: 13px; }
    .stage { top: 60px; bottom: 70px; left: 5px; right: 5px; }
    .desk-decor { display: none; }
}