/*
 * Shared scroll-led learning story shell.
 *
 * A page supplies:
 *   - theme tokens such as --page, --paper, --ink, --accent, and --teal
 *   - one .stage-panel[data-stage-panel] for every .story-step[data-scene]
 *   - page-specific visual styles inside each stage panel
 *
 * learning-story.js owns scene activation, mobile stage cloning, keyboard
 * movement, and the reading progress bar.
 */

.learning-story-page {
    --story-heading-weight: 500;
    --story-heading-size: clamp(2.8rem, 5.8vw, 5rem);
    --story-heading-leading: 0.94;
    --story-stage-radius: 28px;
    --story-stage-shadow: 0 30px 90px rgba(35, 50, 47, 0.12);
    --story-shell: var(--site-shell, min(calc(100% - 3rem), 1180px));
    min-width: 320px;
    margin: 0;
    overflow-x: clip;
    background: var(--page, var(--lux-paper, #f2eee4));
    color: var(--ink, var(--lux-ink, #0b2d28));
    font-family: var(--lux-sans, "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif);
}

.learning-story-page .scroll-progress {
    position: fixed;
    z-index: 130;
    inset: 0 0 auto;
    height: 4px;
    background: var(--accent, var(--lux-copper-deep, #7f4325));
    transform: scaleX(0);
    transform-origin: left;
    will-change: transform;
}

.learning-story-page .hero {
    position: relative;
    width: var(--story-shell);
    min-height: min(760px, calc(100svh - 78px));
    margin: 0 auto;
    padding: clamp(5rem, 11vh, 8rem) 0 5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.learning-story-page .eyebrow,
.learning-story-page .step-kicker,
.learning-story-page .takeaway-label,
.learning-story-page .scene-count,
.learning-story-page .scroll-cue,
.learning-story-page .source-label {
    font-family: var(--lux-mono, "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace);
    letter-spacing: 0.11em;
    text-transform: uppercase;
}

.learning-story-page .eyebrow {
    margin: 0 0 1.5rem;
    color: var(--teal, #1d655a);
    font-size: 0.7rem;
    font-weight: 600;
}

.learning-story-page .hero h1 {
    max-width: 900px;
    margin: 0;
    color: var(--ink, var(--lux-ink, #0b2d28));
    font-family: var(--lux-serif, "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif);
    font-size: clamp(4.2rem, 10vw, 8.2rem);
    font-weight: var(--story-heading-weight);
    line-height: 0.84;
    letter-spacing: -0.07em;
    text-wrap: balance;
}

.learning-story-page .hero h1 span {
    display: block;
    color: var(--accent, var(--lux-copper-deep, #7f4325));
}

.learning-story-page .hero-copy {
    max-width: 700px;
    margin: 2.25rem 0 0;
    color: var(--muted, var(--lux-text-soft, #526d68));
    font-size: clamp(1.05rem, 2vw, 1.25rem);
    line-height: 1.68;
    text-wrap: pretty;
}

.learning-story-page .meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem 1.2rem;
    margin-top: 1.7rem;
    color: var(--faint, var(--lux-text-faint, #71847f));
    font-family: var(--lux-mono, "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace);
    font-size: 0.68rem;
}

.learning-story-page .scroll-cue {
    width: fit-content;
    margin-top: clamp(3rem, 8vh, 5rem);
    color: var(--faint, var(--lux-text-faint, #71847f));
    font-size: 0.62rem;
    text-decoration: none;
}

.learning-story-page .scroll-cue::after {
    display: block;
    width: 1px;
    height: 42px;
    margin: 0.85rem 0 0 0.2rem;
    background: var(--faint, var(--lux-text-faint, #71847f));
    content: "";
    animation: learningStoryCue 1.9s ease-in-out infinite;
}

.learning-story-page .story {
    width: var(--story-shell);
    margin: 0 auto;
    padding: 2rem 0 6rem;
    display: grid;
    grid-template-columns: minmax(340px, 0.95fr) minmax(0, 1.05fr);
    gap: clamp(2.5rem, 6vw, 5rem);
    align-items: start;
}

.learning-story-page .story-stage {
    position: sticky;
    top: 5.5rem;
    height: min(70vh, 620px);
    min-height: 500px;
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.motion-ready .learning-story-page .story-stage {
    opacity: 0;
    transform: translateY(18px);
}

.motion-ready .learning-story-page .story.is-visible .story-stage {
    opacity: 1;
    transform: translateY(0);
}

.learning-story-page .stage-shell,
.learning-story-page .inline-stage {
    position: relative;
    height: 100%;
    overflow: hidden;
    border: 1px solid var(--line, var(--lux-line, rgba(11, 45, 40, 0.16)));
    border-radius: var(--story-stage-radius);
    background: color-mix(in srgb, var(--paper, var(--lux-card, #faf7f0)) 94%, transparent);
    box-shadow: var(--story-stage-shadow);
}

.learning-story-page .stage-top {
    position: absolute;
    z-index: 5;
    inset: 0 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.2rem 1.35rem;
    border-bottom: 1px solid var(--line, var(--lux-line, rgba(11, 45, 40, 0.16)));
    background: color-mix(in srgb, var(--paper, var(--lux-card, #faf7f0)) 90%, transparent);
}

.learning-story-page .scene-count {
    color: var(--faint, var(--lux-text-faint, #71847f));
    font-size: 0.62rem;
}

.learning-story-page .scene-nav {
    display: flex;
    gap: 0.45rem;
}

.learning-story-page .scene-nav a {
    width: 7px;
    height: 7px;
    border: 0;
    border-radius: 50%;
    background: color-mix(in srgb, var(--faint, var(--lux-text-faint, #71847f)) 35%, transparent);
}

.learning-story-page .scene-nav a[aria-current="step"] {
    background: var(--accent, var(--lux-copper-deep, #7f4325));
}

.learning-story-page .stage-canvas {
    position: absolute;
    inset: 0;
}

.learning-story-page .stage-panel {
    position: absolute;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 5.5rem clamp(1.4rem, 4vw, 2.5rem) 2rem;
    opacity: 0;
    transform: translateY(14px) scale(0.985);
    pointer-events: none;
    transition: opacity 0.4s ease, transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.learning-story-page .stage-panel.is-active {
    z-index: 2;
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.learning-story-page .inline-stage {
    display: none;
}

.learning-story-page .story-steps {
    min-width: 0;
    padding: 0;
}

.learning-story-page .story-step {
    min-height: min(92vh, 780px);
    padding: clamp(4rem, 12vh, 8rem) 0;
    display: flex;
    align-items: center;
    scroll-margin-top: 6rem;
}

.learning-story-page .step-copy {
    transition: opacity 0.5s ease, transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.motion-ready .learning-story-page .step-copy {
    opacity: 0.4;
    transform: translateY(16px);
}

.motion-ready .learning-story-page .story-step.is-visible .step-copy {
    opacity: 1;
    transform: translateY(0);
}

.learning-story-page .step-kicker {
    margin-bottom: 1.25rem;
    color: var(--teal, #1d655a);
    font-size: 0.65rem;
    font-weight: 600;
}

.learning-story-page .story-step h2 {
    max-width: 560px;
    margin: 0;
    color: var(--ink, var(--lux-ink, #0b2d28));
    font-family: var(--lux-serif, "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif);
    font-size: var(--story-heading-size);
    font-weight: var(--story-heading-weight);
    line-height: var(--story-heading-leading);
    letter-spacing: -0.055em;
    text-wrap: balance;
}

.learning-story-page .story-step p {
    max-width: 560px;
    margin: 1.4rem 0 0;
    color: var(--muted, var(--lux-text-soft, #526d68));
    font-size: clamp(1rem, 1.7vw, 1.12rem);
    line-height: 1.75;
    text-wrap: pretty;
}

.learning-story-page .story-step a,
.learning-story-page .sources a {
    color: var(--ink, var(--lux-ink, #0b2d28));
    text-decoration-thickness: 1px;
    text-underline-offset: 0.25em;
}

.learning-story-page .takeaway {
    max-width: 560px;
    margin-top: 1.8rem;
    padding-top: 1.2rem;
    border-top: 1px solid var(--line, var(--lux-line, rgba(11, 45, 40, 0.16)));
    color: var(--ink, var(--lux-ink, #0b2d28));
    font-size: 0.92rem;
    line-height: 1.55;
}

.learning-story-page .takeaway-label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--accent, var(--lux-copper-deep, #7f4325));
    font-size: 0.6rem;
    font-weight: 600;
}

.learning-story-page .sources {
    width: var(--story-shell);
    margin: 0 auto;
    padding: 4.5rem 0;
    border-top: 1px solid var(--line, var(--lux-line, rgba(11, 45, 40, 0.16)));
}

.learning-story-page .sources-grid {
    display: grid;
    grid-template-columns: minmax(150px, 0.5fr) minmax(0, 1.5fr);
    gap: clamp(2rem, 6vw, 5rem);
}

.learning-story-page .source-label {
    color: var(--teal, #1d655a);
    font-size: 0.65rem;
    font-weight: 600;
}

.learning-story-page .sources p {
    max-width: 680px;
    margin: 0;
    color: var(--muted, var(--lux-text-soft, #526d68));
    font-size: 0.92rem;
    line-height: 1.75;
}

@keyframes learningStoryCue {
    0%, 100% {
        opacity: 0.35;
        transform: scaleY(0.65);
        transform-origin: top;
    }
    50% {
        opacity: 1;
        transform: scaleY(1);
        transform-origin: top;
    }
}

@media (max-width: 820px) {
    .learning-story-page .hero {
        min-height: auto;
        padding-top: 7.5rem;
    }

    .learning-story-page .story {
        display: block;
        padding: 0;
    }

    .learning-story-page .story-stage {
        display: none;
    }

    .learning-story-page .story-step {
        min-height: 100svh;
        padding: clamp(3rem, 7svh, 5rem) 0;
        display: grid;
        gap: 2rem;
    }

    .learning-story-page .inline-stage {
        display: block;
        height: clamp(320px, 45svh, 430px);
    }

    .learning-story-page .inline-stage .stage-panel {
        padding: 2.5rem 1.5rem;
    }

    .learning-story-page .step-copy {
        width: min(100%, 650px);
    }
}

@media (max-width: 520px) {
    .learning-story-page .hero {
        padding-top: 7rem;
    }

    .learning-story-page .hero h1 {
        font-size: clamp(3.55rem, 18vw, 5.4rem);
    }

    .learning-story-page .inline-stage {
        height: clamp(290px, 41svh, 350px);
        border-radius: 20px;
    }

    .learning-story-page .story-step h2 {
        font-size: clamp(2.65rem, 13vw, 4.2rem);
    }

    .learning-story-page .sources-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .learning-story-page {
        scroll-behavior: auto;
    }

    .learning-story-page *,
    .learning-story-page *::before,
    .learning-story-page *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }

    .learning-story-page .story-stage,
    .learning-story-page .step-copy,
    .learning-story-page .stage-panel {
        opacity: 1;
        transform: none;
    }
}