/* ============================================
   FigigExams Slide Viewer
   All classes prefixed with sv- to avoid conflicts
   ============================================ */

.slide-viewer-app {
    --sv-primary: #667eea;
    --sv-primary-dark: #5a6fd6;
    --sv-secondary: #764ba2;
    --sv-accent: #f093fb;
    --sv-bg: #0f0f1a;
    --sv-bg-slide: #fafbfd;
    --sv-text: #1f2937;
    --sv-text-muted: #6b7280;
    --sv-radius: 16px;
    --sv-radius-sm: 8px;
    --sv-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    --sv-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    display: flex;
    flex-direction: column;
    height: calc(100vh - 70px);
    background: var(--sv-bg);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    -webkit-font-smoothing: antialiased;
    border-radius: 0;
    overflow: hidden;
    position: relative;
}

/* ============================================
   PROGRESS BAR
   ============================================ */
.slide-viewer-app .sv-progress-bar-container {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    z-index: 100;
}

.slide-viewer-app .sv-progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--sv-primary), var(--sv-secondary), var(--sv-accent));
    transition: width var(--sv-transition);
    border-radius: 0 2px 2px 0;
}

/* ============================================
   HEADER
   ============================================ */
.slide-viewer-app .sv-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 24px;
    background: rgba(15, 15, 26, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    z-index: 50;
    min-height: 56px;
}

.slide-viewer-app .sv-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
    flex: 1;
    overflow: hidden;
}

.slide-viewer-app .sv-logo {
    font-size: 1.0625rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--sv-primary), var(--sv-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    flex-shrink: 1;
}

.slide-viewer-app .sv-slide-title-display {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
    font-weight: 400;
    max-width: 400px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.slide-viewer-app .sv-header-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.slide-viewer-app .sv-header-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 14px;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--sv-radius-sm);
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--sv-transition);
    font-family: inherit;
}

.slide-viewer-app .sv-header-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    color: white;
}

.slide-viewer-app .sv-header-btn.active {
    background: rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.4);
    color: var(--sv-primary);
}

.slide-viewer-app .sv-slide-counter {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.4);
    font-weight: 500;
    font-variant-numeric: tabular-nums;
    padding: 0 8px;
}

/* ============================================
   CHAPTER NAV (inside TOC sidebar)
   ============================================ */
.slide-viewer-app .sv-chapter-nav:empty {
    display: none;
}

.slide-viewer-app .sv-chapter-heading {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.3);
    margin-bottom: 12px;
}

.slide-viewer-app .sv-chapter-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.slide-viewer-app .sv-chapter-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border-radius: var(--sv-radius-sm);
    cursor: pointer;
    transition: all var(--sv-transition);
}

.slide-viewer-app .sv-chapter-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.slide-viewer-app .sv-chapter-item.active {
    background: rgba(102, 126, 234, 0.15);
}

.slide-viewer-app .sv-chapter-num {
    width: 30px;
    height: 30px;
    min-width: 30px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8125rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.35);
    transition: all var(--sv-transition);
}

.slide-viewer-app .sv-chapter-item.active .sv-chapter-num {
    background: linear-gradient(135deg, var(--sv-primary), var(--sv-secondary));
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.slide-viewer-app .sv-chapter-info {
    min-width: 0;
    flex: 1;
}

.slide-viewer-app .sv-chapter-title {
    font-size: 0.8125rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.55);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    transition: color var(--sv-transition);
}

.slide-viewer-app .sv-chapter-item:hover .sv-chapter-title {
    color: rgba(255, 255, 255, 0.8);
}

.slide-viewer-app .sv-chapter-item.active .sv-chapter-title {
    color: white;
    font-weight: 600;
}

.slide-viewer-app .sv-chapter-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.06);
    margin: 16px 0;
}

/* ============================================
   MAIN AREA
   ============================================ */
.slide-viewer-app .sv-main-area {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

/* ============================================
   TOC SIDEBAR
   ============================================ */
.slide-viewer-app .sv-toc-sidebar {
    width: 0;
    background: rgba(15, 15, 26, 0.98);
    backdrop-filter: blur(20px);
    border-right: 1px solid rgba(255, 255, 255, 0.06);
    overflow-y: auto;
    overflow-x: hidden;
    transition: width 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
}

.slide-viewer-app .sv-toc-sidebar.open {
    width: 320px;
}

.slide-viewer-app .sv-toc-inner {
    padding: 24px;
    min-width: 320px;
}

.slide-viewer-app .sv-toc-heading {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.3);
    margin-bottom: 16px;
}

.slide-viewer-app .sv-toc-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 14px;
    border-radius: var(--sv-radius-sm);
    cursor: pointer;
    transition: all var(--sv-transition);
    margin-bottom: 4px;
}

.slide-viewer-app .sv-toc-item:hover {
    background: rgba(255, 255, 255, 0.04);
}

.slide-viewer-app .sv-toc-item.active {
    background: rgba(102, 126, 234, 0.12);
}

.slide-viewer-app .sv-toc-number {
    width: 28px;
    height: 28px;
    min-width: 28px;
    background: rgba(255, 255, 255, 0.06);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.4);
    transition: all var(--sv-transition);
}

.slide-viewer-app .sv-toc-item.active .sv-toc-number {
    background: linear-gradient(135deg, var(--sv-primary), var(--sv-secondary));
    color: white;
}

.slide-viewer-app .sv-toc-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.4;
    padding-top: 3px;
    transition: color var(--sv-transition);
}

.slide-viewer-app .sv-toc-item.active .sv-toc-label {
    color: white;
}

/* ============================================
   SLIDE VIEWPORT
   ============================================ */
.slide-viewer-app .sv-slide-viewport {
    flex: 1;
    display: flex;
    align-items: stretch;
    justify-content: center;
    padding: 0;
    position: relative;
    overflow: hidden;
}

/* ============================================
   SLIDE CARD
   ============================================ */
.slide-viewer-app .sv-slide-wrapper {
    position: absolute;
    width: 100%;
    height: 100%;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1),
                opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide-viewer-app .sv-slide-wrapper.current { transform: translateX(0); opacity: 1; }
.slide-viewer-app .sv-slide-wrapper.prev { transform: translateX(-110%); opacity: 0; }
.slide-viewer-app .sv-slide-wrapper.next { transform: translateX(110%); opacity: 0; }

.slide-viewer-app .sv-slide-card {
    background: var(--sv-bg-slide);
    border-radius: 0;
    box-shadow: none;
    border: none;
    overflow-y: auto;
    overflow-x: hidden;
    height: 100%;
    position: relative;
}

.slide-viewer-app .sv-slide-accent {
    height: 4px;
    background: linear-gradient(90deg, var(--sv-primary), var(--sv-secondary), var(--sv-accent));
    border-radius: 0;
}

.slide-viewer-app .sv-slide-content {
    padding: 48px 56px;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
.slide-viewer-app .sv-slide-content h1 {
    font-size: 2.25rem;
    font-weight: 800;
    color: #111827;
    margin-bottom: 8px;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.slide-viewer-app .sv-slide-content h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--sv-primary);
    margin-top: 32px;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.slide-viewer-app .sv-slide-content h1 + h2 {
    margin-top: 4px;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--sv-text-muted);
}

.slide-viewer-app .sv-slide-content h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: #374151;
    margin-top: 28px;
    margin-bottom: 12px;
}

.slide-viewer-app .sv-slide-content p {
    font-size: 1.0625rem;
    line-height: 1.7;
    color: #374151;
    margin-bottom: 16px;
}

.slide-viewer-app .sv-slide-content strong { font-weight: 700; color: #111827; }
.slide-viewer-app .sv-slide-content em { font-style: italic; color: var(--sv-secondary); }

/* ============================================
   LISTS
   ============================================ */
.slide-viewer-app .sv-slide-content ul,
.slide-viewer-app .sv-slide-content ol {
    margin-bottom: 20px;
    padding-left: 0;
    list-style: none;
}

.slide-viewer-app .sv-slide-content ul li {
    position: relative;
    padding: 6px 0 6px 28px;
    font-size: 1.0625rem;
    line-height: 1.6;
    color: #374151;
}

.slide-viewer-app .sv-slide-content ul li::before {
    content: '';
    position: absolute;
    left: 6px;
    top: 16px;
    width: 8px;
    height: 8px;
    background: linear-gradient(135deg, var(--sv-primary), var(--sv-secondary));
    border-radius: 50%;
}

.slide-viewer-app .sv-slide-content ol {
    counter-reset: sv-counter;
}

.slide-viewer-app .sv-slide-content ol li {
    position: relative;
    padding: 8px 0 8px 44px;
    font-size: 1.0625rem;
    line-height: 1.6;
    color: #374151;
    counter-increment: sv-counter;
}

.slide-viewer-app .sv-slide-content ol li::before {
    content: counter(sv-counter);
    position: absolute;
    left: 0;
    top: 6px;
    width: 30px;
    height: 30px;
    background: linear-gradient(135deg, var(--sv-primary), var(--sv-secondary));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8125rem;
    font-weight: 700;
    color: white;
}

/* ============================================
   TABLES
   ============================================ */
.slide-viewer-app .sv-slide-content table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 20px 0;
    font-size: 0.9375rem;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #e5e7eb;
}

.slide-viewer-app .sv-slide-content thead th {
    background: linear-gradient(135deg, #667eea10, #764ba210);
    padding: 14px 18px;
    text-align: left;
    font-weight: 700;
    color: var(--sv-primary-dark);
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 2px solid var(--sv-primary);
}

.slide-viewer-app .sv-slide-content tbody td {
    padding: 12px 18px;
    border-bottom: 1px solid #f3f4f6;
    color: #374151;
    vertical-align: top;
}

.slide-viewer-app .sv-slide-content tbody tr:last-child td { border-bottom: none; }
.slide-viewer-app .sv-slide-content tbody tr:hover { background: #f9fafb; }

/* ============================================
   CODE BLOCKS
   ============================================ */
.slide-viewer-app .sv-slide-content pre {
    margin: 20px 0;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.06);
}

.slide-viewer-app .sv-slide-content pre code {
    display: block;
    padding: 20px 24px;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.875rem;
    line-height: 1.7;
    tab-size: 4;
    overflow-x: auto;
}

.slide-viewer-app .sv-slide-content code {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.875em;
    background: #f3f4f6;
    color: #e11d48;
    padding: 2px 8px;
    border-radius: 6px;
}

.slide-viewer-app .sv-slide-content pre code {
    background: none;
    color: inherit;
    padding: 0;
}

.slide-viewer-app .sv-copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 6px 10px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all var(--sv-transition);
    font-family: inherit;
    z-index: 2;
}

.slide-viewer-app .sv-copy-btn:hover { background: rgba(255, 255, 255, 0.2); color: white; }
.slide-viewer-app .sv-copy-btn.copied { background: rgba(16, 185, 129, 0.2); border-color: rgba(16, 185, 129, 0.4); color: #10b981; }

/* ============================================
   IMAGES & FIGURES
   ============================================ */
.slide-viewer-app .sv-slide-content img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
    margin: 20px auto;
    display: block;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    border: 1px solid #e5e7eb;
}

.slide-viewer-app .sv-slide-content .sv-figure {
    margin: 28px 0;
    text-align: center;
}

.slide-viewer-app .sv-slide-content .sv-figure img {
    margin-bottom: 12px;
}

.slide-viewer-app .sv-slide-content .sv-figure-caption {
    font-size: 0.875rem;
    color: var(--sv-text-muted);
    font-style: italic;
    line-height: 1.5;
    max-width: 80%;
    margin: 0 auto;
}

.slide-viewer-app .sv-slide-content .sv-figure-caption strong {
    color: var(--sv-primary-dark);
    font-style: normal;
}

/* Image grid for side-by-side figures */
.slide-viewer-app .sv-slide-content .sv-image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 24px 0;
}

.slide-viewer-app .sv-slide-content .sv-image-grid img {
    margin: 0;
    width: 100%;
    object-fit: cover;
}

/* Inline small images (icons, logos) */
.slide-viewer-app .sv-slide-content p img {
    display: inline;
    margin: 0 4px;
    vertical-align: middle;
    border-radius: 4px;
    box-shadow: none;
    border: none;
    max-height: 1.5em;
}

@media (max-width: 768px) {
    .slide-viewer-app .sv-slide-content img {
        border-radius: 8px;
        margin: 16px auto;
    }
    .slide-viewer-app .sv-slide-content .sv-figure { margin: 20px 0; }
    .slide-viewer-app .sv-slide-content .sv-figure-caption { max-width: 100%; font-size: 0.8125rem; }
    .slide-viewer-app .sv-slide-content .sv-image-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
}

/* ============================================
   BLOCKQUOTES
   ============================================ */
.slide-viewer-app .sv-slide-content blockquote {
    margin: 24px 0;
    padding: 20px 24px;
    background: linear-gradient(135deg, #667eea08, #764ba208);
    border-left: 4px solid var(--sv-primary);
    border-radius: 0 12px 12px 0;
    font-size: 1.0625rem;
    color: #4b5563;
    line-height: 1.7;
}

.slide-viewer-app .sv-slide-content blockquote p { margin-bottom: 0; }

/* ============================================
   NAV ARROWS
   ============================================ */
.slide-viewer-app .sv-nav-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--sv-transition);
    color: rgba(255, 255, 255, 0.5);
    font-size: 1.25rem;
    z-index: 10;
    backdrop-filter: blur(10px);
}

.slide-viewer-app .sv-nav-arrow:hover {
    background: rgba(255, 255, 255, 0.15);
    color: white;
    transform: translateY(-50%) scale(1.05);
}

.slide-viewer-app .sv-nav-arrow.disabled { opacity: 0.2; cursor: default; pointer-events: none; }
.slide-viewer-app .sv-nav-arrow.left { left: 16px; }
.slide-viewer-app .sv-nav-arrow.right { right: 16px; }

/* ============================================
   BOTTOM NAV
   ============================================ */
.slide-viewer-app .sv-bottom-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 8px 24px;
    background: rgba(15, 15, 26, 0.95);
    backdrop-filter: blur(20px);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    flex-wrap: wrap;
    max-height: 44px;
    overflow: hidden;
    flex-shrink: 0;
}

.slide-viewer-app .sv-page-num {
    min-width: 28px;
    height: 26px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.1);
    cursor: pointer;
    transition: all var(--sv-transition);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6875rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.55);
    padding: 0 4px;
}

.slide-viewer-app .sv-page-num:hover { background: rgba(255, 255, 255, 0.2); color: rgba(255, 255, 255, 0.85); }
.slide-viewer-app .sv-page-num.active { background: var(--sv-primary); color: #fff; }
.slide-viewer-app .sv-page-ellipsis {
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.75rem;
    padding: 0 2px;
    user-select: none;
}

/* ============================================
   KEYBOARD HINT
   ============================================ */
.slide-viewer-app .sv-keyboard-hint {
    position: absolute;
    bottom: 60px;
    right: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    border-radius: var(--sv-radius-sm);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.4);
    pointer-events: none;
    opacity: 1;
    transition: opacity 2s ease;
    z-index: 50;
}

.slide-viewer-app .sv-keyboard-hint.hidden { opacity: 0; }

.slide-viewer-app .sv-kbd {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 22px;
    padding: 0 6px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    font-size: 0.6875rem;
    font-weight: 600;
    font-family: inherit;
}

/* ============================================
   FULLSCREEN
   ============================================ */
.slide-viewer-app.fullscreen {
    height: 100vh;
    border-radius: 0;
}

.slide-viewer-app.fullscreen .sv-header {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.slide-viewer-app.fullscreen .sv-bottom-nav {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 60;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.slide-viewer-app.fullscreen:hover .sv-header {
    opacity: 1;
    pointer-events: auto;
}

.slide-viewer-app.fullscreen:hover .sv-bottom-nav {
    opacity: 1;
    pointer-events: auto;
}

.slide-viewer-app.fullscreen .sv-slide-viewport { padding: 0; }
.slide-viewer-app.fullscreen .sv-slide-card { height: 100%; }

/* ============================================
   SCROLLBARS
   ============================================ */
.slide-viewer-app .sv-slide-card::-webkit-scrollbar { width: 6px; }
.slide-viewer-app .sv-slide-card::-webkit-scrollbar-track { background: transparent; }
.slide-viewer-app .sv-slide-card::-webkit-scrollbar-thumb { background: #d1d5db; border-radius: 3px; }
.slide-viewer-app .sv-slide-card::-webkit-scrollbar-thumb:hover { background: #9ca3af; }

.slide-viewer-app .sv-toc-sidebar::-webkit-scrollbar { width: 4px; }
.slide-viewer-app .sv-toc-sidebar::-webkit-scrollbar-track { background: transparent; }
.slide-viewer-app .sv-toc-sidebar::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.1); border-radius: 2px; }

/* ============================================
   PAYWALL OVERLAY
   ============================================ */
.slide-viewer-app .sv-paywall-overlay {
    position: absolute;
    inset: 0;
    z-index: 80;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(15, 15, 26, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.slide-viewer-app .sv-paywall-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

.slide-viewer-app .sv-paywall-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 48px;
    max-width: 460px;
    width: 90%;
    text-align: center;
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.4);
    animation: sv-paywall-appear 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes sv-paywall-appear {
    from { transform: scale(0.9) translateY(20px); opacity: 0; }
    to { transform: scale(1) translateY(0); opacity: 1; }
}

.slide-viewer-app .sv-paywall-lock {
    width: 72px;
    height: 72px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, var(--sv-primary), var(--sv-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: white;
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.3);
}

.slide-viewer-app .sv-paywall-card h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.slide-viewer-app .sv-paywall-card p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.6;
    margin-bottom: 28px;
}

.slide-viewer-app .sv-paywall-card p strong {
    color: rgba(255, 255, 255, 0.9);
}

.slide-viewer-app .sv-paywall-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 36px;
    background: linear-gradient(135deg, var(--sv-primary), var(--sv-secondary));
    color: white;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.slide-viewer-app .sv-paywall-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.5);
    color: white;
    text-decoration: none;
}

.slide-viewer-app .sv-paywall-back {
    display: block;
    margin: 16px auto 0;
    padding: 8px 20px;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 8px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
}

.slide-viewer-app .sv-paywall-back:hover {
    background: rgba(255, 255, 255, 0.06);
    color: rgba(255, 255, 255, 0.8);
    border-color: rgba(255, 255, 255, 0.25);
}

/* Locked TOC items */
.slide-viewer-app .sv-toc-item.locked {
    opacity: 0.35;
    cursor: default;
}

.slide-viewer-app .sv-toc-item.locked:hover {
    background: transparent;
}

/* Locked page numbers */
.slide-viewer-app .sv-page-num.locked {
    opacity: 0.3;
    font-size: 0.5rem;
    cursor: default;
}

.slide-viewer-app .sv-page-num.locked:hover {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.55);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .slide-viewer-app .sv-slide-viewport { padding: 0; }
    .slide-viewer-app .sv-slide-wrapper { width: 100%; }
    .slide-viewer-app .sv-slide-content { padding: 28px 24px; }
    .slide-viewer-app .sv-slide-content h1 { font-size: 1.75rem; }
    .slide-viewer-app .sv-slide-content h2 { font-size: 1.25rem; }
    .slide-viewer-app .sv-slide-content p,
    .slide-viewer-app .sv-slide-content ul li,
    .slide-viewer-app .sv-slide-content ol li { font-size: 0.9375rem; }
    .slide-viewer-app .sv-slide-content table { font-size: 0.8125rem; }
    .slide-viewer-app .sv-slide-content thead th,
    .slide-viewer-app .sv-slide-content tbody td { padding: 8px 12px; }
    .slide-viewer-app .sv-nav-arrow { width: 36px; height: 36px; font-size: 1rem; }
    .slide-viewer-app .sv-nav-arrow.left { left: 4px; }
    .slide-viewer-app .sv-nav-arrow.right { right: 4px; }
    .slide-viewer-app .sv-toc-sidebar.open {
        position: absolute;
        z-index: 60;
        height: 100%;
        width: 280px;
        box-shadow: 4px 0 24px rgba(0, 0, 0, 0.5);
    }
    .slide-viewer-app .sv-header .sv-slide-title-display { display: none; }
    .slide-viewer-app .sv-slide-card { height: 100%; }
    .slide-viewer-app .sv-header .sv-btn-label { display: none; }
    .slide-viewer-app .sv-paywall-card { padding: 32px 24px; }
    .slide-viewer-app .sv-paywall-card h2 { font-size: 1.25rem; }
    .slide-viewer-app .sv-paywall-lock { width: 56px; height: 56px; font-size: 1.375rem; }
}