/* Book Zoom — Zumly-powered deep dive into Adaptive */

/* Overlay container */
.book-zoom-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 200;
    background: var(--bg);
}

.book-zoom-overlay.active {
    display: block;
}

/* Back to site button */
.book-zoom-back {
    position: fixed;
    top: 1rem;
    left: 1.5rem;
    z-index: 210;
    background: rgba(10, 15, 26, 0.7);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
    font-family: inherit;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.book-zoom-back:hover {
    color: var(--text);
    border-color: var(--text-muted);
    background: rgba(10, 15, 26, 0.9);
}

/* Canvas fills the overlay */
.book-zoom-canvas {
    width: 100vw;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

/* Equations background on all views */
.book-zoom-canvas .z-view {
    background: #0b1525 url('/img/book/equations-bg.svg') center center / cover no-repeat;
}

/* ===== Image Elements ===== */

.overview-book-img {
    width: 140px;
    height: auto;
    margin-bottom: 1.25rem;
    filter: drop-shadow(0 8px 24px rgba(0,0,0,0.4));
}

.detail-illustration {
    width: 100%;
    max-width: 700px;
    height: auto;
    margin: 0.5rem 0 1.5rem;
    border-radius: 8px;
}

.detail-book-img {
    width: 280px;
    height: auto;
    margin: 0 auto 1.25rem;
    display: block;
    filter: drop-shadow(0 6px 20px rgba(0,0,0,0.4));
}

@media (max-width: 600px) {
    .overview-book-img {
        width: 100px;
    }

    .detail-book-img {
        width: 200px;
    }
}

/* ===== View Styling ===== */

/* All views share this base */
.z-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    padding: 3rem 2rem;
    text-align: center;
    background: transparent;
}

/* Overview (the 5-block map) */
.z-view.view-overview {
    padding: 2rem;
}

.overview-title {
    font-size: 2rem;
    font-weight: 300;
    letter-spacing: 0.15em;
    margin-bottom: 0.25rem;
    color: #f5c542;
}

.overview-subtitle {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    max-width: 700px;
    width: 100%;
}

.overview-block {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.75rem 1.25rem;
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
}

.overview-block:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.overview-block:nth-child(4),
.overview-block:nth-child(5) {
    /* Center the bottom two */
}

.block-number {
    font-size: 2rem;
    font-weight: 200;
    color: var(--text-muted);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.block-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.block-subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Section-level views (the 5 blocks zoomed in) */
.z-view.view-section {
    padding: 3rem 2rem;
}

.section-header {
    margin-bottom: 2.5rem;
}

.section-number {
    font-size: 3.5rem;
    font-weight: 200;
    color: var(--text-muted);
    line-height: 1;
    margin-bottom: 0.25rem;
}

.section-title {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
    color: #f5c542;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
}

.section-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.25rem;
    max-width: 800px;
    width: 100%;
}

.section-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s;
    text-align: left;
}

.section-card:hover {
    border-color: var(--accent);
    transform: translateY(-1px);
}

.card-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}

.card-preview {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.4;
}

/* Detail views (drill-downs) */
.z-view.view-detail {
    padding: 3rem 2rem;
    text-align: left;
    align-items: flex-start;
    max-width: 100%;
}

.detail-content {
    max-width: 700px;
    margin: 0 auto;
    width: 100%;
}

.detail-badge {
    display: inline-block;
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #f5c542;
    margin-bottom: 0.75rem;
}

.detail-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    line-height: 1.2;
}

.detail-lead {
    font-size: 1.15rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    color: var(--text);
}

.detail-body {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-muted);
}

.detail-body p {
    margin-bottom: 1rem;
}

.detail-body strong {
    color: var(--text);
}

.detail-body ul {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.detail-body ul li {
    padding: 0.4rem 0;
    padding-left: 1.25rem;
    position: relative;
}

.detail-body ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.85rem;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
}

.detail-highlight {
    background: var(--bg-secondary);
    border-left: 3px solid #f5c542;
    padding: 1.25rem 1.5rem;
    margin: 1.5rem 0;
    font-style: italic;
    color: var(--text);
    font-size: 1.05rem;
    line-height: 1.5;
}

/* Eras timeline */
.eras-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
}

.era-item {
    text-align: center;
    padding: 1rem 0.5rem;
    background: var(--bg-secondary);
    border-radius: 6px;
}

.era-label {
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.era-period {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Pace timeline */
.pace-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.75rem;
    margin: 1.5rem 0;
}

.pace-item {
    text-align: center;
    padding: 0.75rem 0.25rem;
}

.pace-label {
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.15rem;
}

.pace-dates {
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

.pace-duration {
    font-size: 0.7rem;
    color: var(--accent);
    font-weight: 600;
}

/* Levels grid */
.levels-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.level-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.25rem;
}

.level-number {
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #f5c542;
    margin-bottom: 0.5rem;
}

.level-name {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.level-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* Fuzzy boundary spectrum */
.spectrum {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin: 1.5rem 0;
    max-width: 500px;
}

.spectrum-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 0.85rem;
}

.spectrum-bar {
    flex: 1;
    height: 4px;
    background: linear-gradient(to right, var(--accent), #f5c542);
    border-radius: 2px;
}

/* Change drivers */
.drivers-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 1rem 0;
}

.driver-tag {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 0.4rem 1rem;
    font-size: 0.8rem;
}

/* Outcomes stats */
.outcome-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin: 1.5rem 0;
}

.outcome-stat {
    text-align: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 6px;
}

.outcome-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: #f5c542;
}

.outcome-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 600px) {
    .overview-grid {
        grid-template-columns: 1fr 1fr;
    }

    .section-grid {
        grid-template-columns: 1fr;
    }

    .eras-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .pace-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .outcome-stats {
        grid-template-columns: 1fr;
    }

    .overview-title {
        font-size: 1.5rem;
    }

    .section-number {
        font-size: 2.5rem;
    }

    .detail-title {
        font-size: 1.35rem;
    }
}