/* ========================================
   3D Page – Visual Storytelling Layout
   ======================================== */

/* ── Hero override ── */
.page-hero--3d {
    padding: 160px var(--spacing-lg) var(--spacing-3xl);
    text-align: center;
    background: linear-gradient(180deg, var(--surface-elevated) 0%, var(--background) 100%);
}

[data-theme="dark"] .page-hero--3d {
    background: linear-gradient(180deg, var(--surface) 0%, var(--background) 100%);
}

.page-hero--3d .project-tag {
    margin-left: auto;
    margin-right: auto;
}

.page-hero--3d h1 {
    letter-spacing: -0.02em;
}

.page-hero--3d p {
    max-width: 640px;
    margin: 0 auto;
    font-size: 1.2rem;
    line-height: 1.7;
}

/* ── Intro note – styled callout ── */
.intro-callout {
    max-width: 780px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-2xl);
    background: var(--surface);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    position: relative;
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.intro-callout::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(180deg, var(--primary-500), var(--primary-300));
}

.intro-callout-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-400));
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    font-style: italic;
    font-family: var(--font-display);
}

.intro-callout p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin: 0;
}

.intro-callout strong {
    color: var(--text-primary);
}

/* ── Section wrapper with alternating backgrounds ── */
.story-section {
    padding: 5rem var(--spacing-lg);
}

.story-section--alt {
    background: var(--surface);
}

[data-theme="dark"] .story-section--alt {
    background: var(--surface-elevated);
}

/* ── Section header – large, with number ── */
.section-header {
    max-width: 1100px;
    margin: 0 auto var(--spacing-2xl);
    display: flex;
    align-items: baseline;
    gap: var(--spacing-lg);
}

.section-number {
    font-family: var(--font-display);
    font-size: 5rem;
    font-weight: 700;
    line-height: 1;
    background: linear-gradient(135deg, var(--primary-400), var(--primary-200));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    flex-shrink: 0;
    user-select: none;
    opacity: 0.35;
    letter-spacing: -0.04em;
}

.section-header-text h2 {
    font-size: 2.15rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.01em;
}

.section-header-text .section-subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
    line-height: 1.5;
    font-style: italic;
}

/* ── Content blocks ── */
.story-content {
    max-width: 1100px;
    margin: 0 auto;
}

/* Prose – reading width */
.story-prose {
    max-width: 720px;
    margin: 0 auto;
}

.story-prose p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: var(--spacing-lg);
    text-align: justify;
}

.story-prose p:last-child {
    margin-bottom: 0;
}

.story-prose em {
    color: var(--text-muted);
}

/* ── Grid layout: text + image side by side ── */
.story-grid {
    display: grid;
    grid-template-columns: 1fr 1.15fr;
    gap: var(--spacing-2xl);
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
}

.story-grid--reverse {
    grid-template-columns: 1.15fr 1fr;
}

.story-grid--reverse > :first-child {
    order: 2;
}

.story-grid--reverse > :last-child {
    order: 1;
}

.story-grid--wide-img {
    grid-template-columns: 1fr 1.4fr;
}

.story-grid--wide-img.story-grid--reverse {
    grid-template-columns: 1.4fr 1fr;
}

.story-grid--narrow-img {
    grid-template-columns: 1.4fr 1fr;
}

.story-grid--narrow-img.story-grid--reverse {
    grid-template-columns: 1fr 1.4fr;
}

.grid-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: var(--spacing-lg);
    text-align: justify;
}

.grid-text p:last-child {
    margin-bottom: 0;
}

.grid-text h3 {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

/* ── Subsection heading (h3) within content ── */
.story-content h3,
.story-prose h3 {
    font-size: 1.4rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-3xl);
    font-weight: 600;
    position: relative;
    padding-left: var(--spacing-lg);
}

.story-content h3::before,
.story-prose h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.15em;
    width: 4px;
    height: 1em;
    background: var(--primary-400);
}

/* ── Figures ── */
.fig-story {
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--surface);
    cursor: pointer;
    transition: box-shadow var(--transition-base), transform var(--transition-base);
}

.fig-story:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-2px);
}

.fig-story img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
    background: var(--neutral-900);
    transition: transform 0.4s ease;
}

.fig-story:hover img {
    transform: scale(1.015);
}

.fig-story figcaption {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.88rem;
    font-style: italic;
    color: var(--text-muted);
    line-height: 1.5;
    background: var(--surface);
    border-top: 1px solid var(--border);
}

/* Full-width figure (for big showcase images) */
.fig-showcase {
    max-width: 1100px;
    margin: var(--spacing-2xl) auto;
    overflow: hidden;
    border: 1px solid var(--border);
    background: var(--surface);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

.fig-showcase:hover {
    box-shadow: var(--shadow-xl);
}

.fig-showcase img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
    background: var(--neutral-900);
}

.fig-showcase figcaption {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 0.9rem;
    font-style: italic;
    color: var(--text-muted);
    line-height: 1.6;
    background: var(--surface);
    border-top: 1px solid var(--border);
}

/* Extra-wide showcase that breaks out of container */
.fig-showcase--bleed {
    max-width: 1300px;
    margin-left: auto;
    margin-right: auto;
}

/* ── Insight / learning callout ── */
.insight-callout {
    max-width: 720px;
    margin: var(--spacing-2xl) auto;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: var(--accent-bg);
    border-left: 4px solid var(--primary-400);
    position: relative;
    box-shadow: var(--shadow-sm);
}

.insight-callout::after {
    content: '';
    position: absolute;
    right: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    opacity: 0.12;
    background: var(--primary-400);
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cpath d='M12 2a7 7 0 0 1 7 7c0 2.38-1.19 4.47-3 5.74V17a2 2 0 0 1-2 2h-4a2 2 0 0 1-2-2v-2.26C6.19 13.47 5 11.38 5 9a7 7 0 0 1 7-7z'/%3E%3Cpath d='M10 21h4'/%3E%3C/svg%3E");
    -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='currentColor' stroke-width='2'%3E%3Cpath d='M12 2a7 7 0 0 1 7 7c0 2.38-1.19 4.47-3 5.74V17a2 2 0 0 1-2 2h-4a2 2 0 0 1-2-2v-2.26C6.19 13.47 5 11.38 5 9a7 7 0 0 1 7-7z'/%3E%3Cpath d='M10 21h4'/%3E%3C/svg%3E");
    mask-size: contain;
    -webkit-mask-size: contain;
    mask-repeat: no-repeat;
    -webkit-mask-repeat: no-repeat;
}

.insight-callout p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin: 0;
    font-style: italic;
}

.insight-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent-text);
    margin-bottom: var(--spacing-sm);
    font-style: normal;
}

/* ── Milestone marker ── */
.milestone {
    max-width: 720px;
    margin: var(--spacing-2xl) auto;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) 0;
}

.milestone-dot {
    width: 8px;
    height: 8px;
    background: var(--primary-400);
    flex-shrink: 0;
    border-radius: 50%;
}

.milestone-line {
    flex: 1;
    height: 1px;
    background: linear-gradient(90deg, var(--primary-300), var(--border));
}

.milestone-line:last-of-type {
    background: linear-gradient(90deg, var(--border), var(--primary-300));
}

.milestone-text {
    font-family: var(--font-display);
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--accent-text);
    white-space: nowrap;
    letter-spacing: 0.02em;
}

/* ── Image pair – two images side by side ── */
.fig-pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    max-width: 1100px;
    margin: var(--spacing-2xl) auto;
}

/* ── Section divider ── */
.section-divider {
    max-width: 1100px;
    margin: 0 auto;
    border: none;
    border-top: 1px solid var(--border);
}

/* ── Conclusion ── */
.story-conclusion {
    padding: 5rem var(--spacing-lg);
    text-align: center;
}

.conclusion-inner {
    max-width: 680px;
    margin: 0 auto;
}

.conclusion-inner h2 {
    font-size: 2.15rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.conclusion-inner h2::before {
    content: '';
    display: block;
    width: 40px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-500), var(--primary-300));
    margin: 0 auto var(--spacing-lg);
}

.conclusion-inner p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.conclusion-inner p:last-of-type {
    margin-bottom: var(--spacing-xl);
}

/* ── Image gallery strip ── */
.gallery-strip {
    display: flex;
    gap: var(--spacing-md);
    overflow-x: auto;
    padding: var(--spacing-sm) 0;
    max-width: 1100px;
    margin: var(--spacing-xl) auto;
    -webkit-overflow-scrolling: touch;
}

.gallery-strip .fig-story {
    flex: 0 0 auto;
    width: 300px;
}

/* ── Compact article (for short/unfinished sections) ── */
.story-compact {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    max-width: 1100px;
    margin: 0 auto;
    align-items: start;
}

.compact-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: var(--spacing-lg);
}

/* ── Responsive ── */
@media (max-width: 968px) {
    .story-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }

    .story-grid--reverse > :first-child {
        order: unset;
    }

    .story-grid--reverse > :last-child {
        order: unset;
    }

    .story-grid--wide-img,
    .story-grid--narrow-img,
    .story-grid--wide-img.story-grid--reverse,
    .story-grid--narrow-img.story-grid--reverse {
        grid-template-columns: 1fr;
    }

    .story-compact {
        grid-template-columns: 1fr;
    }

    .fig-pair {
        grid-template-columns: 1fr;
    }

    .section-header {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

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

@media (max-width: 768px) {
    .page-hero--3d {
        padding-top: 120px;
    }

    .intro-callout {
        flex-direction: column;
        padding: var(--spacing-lg);
    }

    .story-section {
        padding: var(--spacing-2xl) var(--spacing-lg);
    }

    .story-content h3::before,
    .story-prose h3::before {
        display: none;
    }

    .story-content h3,
    .story-prose h3 {
        padding-left: 0;
    }

    .fig-showcase--bleed {
        max-width: 100%;
    }

    .insight-callout {
        margin-left: 0;
        margin-right: 0;
    }

    .milestone {
        gap: var(--spacing-sm);
    }
}

/* ── Scroll reveal animations ── */
@keyframes revealUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.reveal {
    opacity: 0;
}

.reveal.is-visible {
    animation: revealUp 0.6s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

/* Stagger children within grids and pairs */
.reveal.is-visible .grid-text {
    animation: revealUp 0.6s cubic-bezier(0.22, 1, 0.36, 1) 0.1s forwards;
    opacity: 0;
}

.reveal.is-visible .fig-story,
.reveal.is-visible .fig-showcase {
    animation: revealUp 0.6s cubic-bezier(0.22, 1, 0.36, 1) 0.2s forwards;
    opacity: 0;
}

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
    }

    .reveal.is-visible,
    .reveal.is-visible .grid-text,
    .reveal.is-visible .fig-story,
    .reveal.is-visible .fig-showcase {
        animation: none;
        opacity: 1;
    }
}