/* ────────────────────────────────────────────────────────────────────
   Venturis — Scroll-driven section panels
   
   Full-viewport pinned panels from Mission → CTA.  Each panel owns
   its own background canvas and content layer.  A CSS custom property
   --progress (0 → 1) is set per-panel by JS and drives all entrance /
   exit animations via pure CSS calc().
   
   Loaded after landing.css.  Relies on the same design tokens:
   --paper, --ink, --brass, --font-display, --font-mono, --font, etc.
   ──────────────────────────────────────────────────────────────────── */


/* ═══════════════════════════════════════════════════════════════════
   1. SCROLL CONTAINER
   ═══════════════════════════════════════════════════════════════════ */

.scroll-story {
    width: 100%;
}


/* ═══════════════════════════════════════════════════════════════════
   2. SCROLL PANELS — full-viewport sections
   ═══════════════════════════════════════════════════════════════════ */

.scroll-panel {
    position: relative;
    min-height: 100vh;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    /* Each panel declares its own --panel-bg; fallback to ink */
    --panel-bg: var(--ink);
}

/* Top edge blend overlay — taller for smoother inter-panel blending */
.scroll-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 180px;
    background: linear-gradient(to bottom, var(--panel-bg), transparent);
    z-index: 1;
    pointer-events: none;
}

/* Bottom edge blend overlay */
.scroll-panel::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 180px;
    background: linear-gradient(to top, var(--panel-bg), transparent);
    z-index: 1;
    pointer-events: none;
}


/* ═══════════════════════════════════════════════════════════════════
   3. PANEL BACKGROUNDS — canvas + fallback colour
   ═══════════════════════════════════════════════════════════════════ */

.scroll-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    width: 100%;
    height: 100%;
    display: block;
    pointer-events: none;
}

/* ── Per-panel background colours ─────────────────────────────────── */

[data-panel="mission"] {
    --panel-bg: #14110a;
    background: #14110a;
    color: var(--paper);
}

[data-panel="problem"] {
    --panel-bg: #0a0e14;
    background: #0a0e14;
    color: var(--paper);
}

[data-panel="engine"] {
    --panel-bg: #1a1814;
    background: #1a1814;
    color: var(--paper);
}

[data-panel="how-it-works"] {
    --panel-bg: #0c1018;
    background: linear-gradient(170deg, var(--ink) 0%, #0c1018 100%);
    color: var(--paper);
}

[data-panel="map-features"] {
    --panel-bg: #14110a;
    background: #14110a;
    color: var(--paper);
}

[data-panel="faq"] {
    --panel-bg: var(--paper);
    background: var(--paper);
    color: var(--ink);
}

[data-panel="cta"] {
    --panel-bg: var(--ink);
    background: var(--ink);
    color: var(--paper);
}


/* ═══════════════════════════════════════════════════════════════════
   4. SCROLL CONTENT — centred, layered above background
   ═══════════════════════════════════════════════════════════════════ */

.scroll-content {
    position: relative;
    z-index: 2;
    width: min(100%, 1140px);
    margin: 0 auto;
    padding: 6rem 2.5rem;

    /* --progress driven animation:
       0–0.15  → fade in  + slide up     (gentle entrance)
       0.15–0.85 → hold                  (long comfortable read)
       0.85–1  → fade out + slide up     (late, slow exit)            */
    --fade-in:  clamp(0, var(--progress, 0) * 6.667,           1);
    --fade-out: clamp(0, (1 - var(--progress, 0)) * 6.667,     1);
    --opacity:  min(var(--fade-in), var(--fade-out));
    --y-enter:  calc((1 - clamp(0, var(--progress, 0) * 6.667,         1)) * 36px);
    --y-exit:   calc((1 - clamp(0, (1 - var(--progress, 0)) * 6.667,  1)) * -18px);
    --y:        calc(var(--y-enter) + var(--y-exit));

    opacity: var(--opacity);
    transform: translateY(var(--y));
    transition: opacity 0.15s ease-out, transform 0.15s ease-out;
    will-change: opacity, transform;
}


/* ── Staggered child reveals within scroll panels ────────────────── */

.scroll-panel .scroll-content__kicker,
.scroll-panel .scroll-content__title,
.scroll-panel .scroll-content__body,
.scroll-panel .scroll-content__grid,
.scroll-panel .scroll-timeline,
.scroll-panel .scroll-faq-list,
.scroll-panel .scroll-cta-btn {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

.scroll-panel.in-view .scroll-content__kicker   { opacity: 1; transform: none; transition-delay: 0s; }
.scroll-panel.in-view .scroll-content__title     { opacity: 1; transform: none; transition-delay: 0.12s; }
.scroll-panel.in-view .scroll-content__body      { opacity: 1; transform: none; transition-delay: 0.22s; }
.scroll-panel.in-view .scroll-content__grid      { opacity: 1; transform: none; transition-delay: 0.3s; }
.scroll-panel.in-view .scroll-timeline           { opacity: 1; transform: none; transition-delay: 0.3s; }
.scroll-panel.in-view .scroll-faq-list           { opacity: 1; transform: none; transition-delay: 0.3s; }
.scroll-panel.in-view .scroll-cta-btn            { opacity: 1; transform: none; transition-delay: 0.36s; }


/* ═══════════════════════════════════════════════════════════════════
   5. CONTENT ELEMENT TYPOGRAPHY
   ═══════════════════════════════════════════════════════════════════ */

.scroll-content__kicker {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: var(--brass);
    margin-bottom: 1.2rem;
    display: block;
}

.scroll-content__title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 1.4rem;
}

.scroll-content__body {
    font-family: var(--font);
    font-size: clamp(0.95rem, 1.1vw, 1.08rem);
    line-height: 1.72;
    color: rgba(250, 250, 249, 0.68);
    max-width: 38rem;
}

/* Light panels override body text colour */
[data-panel="faq"] .scroll-content__body {
    color: var(--char);
}

.scroll-content__grid {
    margin-top: 3rem;
}


/* ═══════════════════════════════════════════════════════════════════
   6. PANEL-SPECIFIC: MISSION
   ═══════════════════════════════════════════════════════════════════ */

[data-panel="mission"] .scroll-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

[data-panel="mission"] .scroll-content__title {
    font-size: clamp(2rem, 4vw, 3.2rem);
    max-width: 48rem;
}

[data-panel="mission"] .scroll-content__body {
    max-width: 42rem;
    font-size: clamp(1rem, 1.2vw, 1.14rem);
    line-height: 1.78;
    color: rgba(250, 250, 249, 0.58);
}


/* ═══════════════════════════════════════════════════════════════════
   7. PANEL-SPECIFIC: PROBLEM — stat cards
   ═══════════════════════════════════════════════════════════════════ */

[data-panel="problem"] .scroll-content {
    text-align: center;
}

[data-panel="problem"] .scroll-content__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.6rem;
}

.scroll-stat-card {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-left: 3px solid var(--brass);
    border-radius: var(--radius);
    padding: 2rem 1.8rem;
    text-align: left;
    transition: background 0.3s var(--motion-ease-settle);
}

.scroll-stat-card:hover {
    background: rgba(255, 255, 255, 0.07);
}

.scroll-stat-card__number {
    font-family: var(--font-display);
    font-size: clamp(2rem, 3vw, 2.8rem);
    font-weight: 700;
    color: var(--paper);
    letter-spacing: -0.02em;
    line-height: 1;
    margin-bottom: 0.4rem;
}

.scroll-stat-card__label {
    font-family: var(--font-mono);
    font-size: 0.64rem;
    font-weight: 600;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--brass);
    margin-bottom: 0.9rem;
}

.scroll-stat-card__text {
    font-family: var(--font);
    font-size: 0.88rem;
    line-height: 1.6;
    color: rgba(250, 250, 249, 0.55);
}


/* ═══════════════════════════════════════════════════════════════════
   8. PANEL-SPECIFIC: ENGINE — scoring pillars
   ═══════════════════════════════════════════════════════════════════ */

[data-panel="engine"] .scroll-content__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.scroll-pillar {
    padding: 2rem 1.6rem 1.8rem;
    border-bottom: 1px solid rgba(212, 164, 74, 0.2);
    transition: border-color 0.3s;
}

.scroll-pillar:hover {
    border-bottom-color: var(--brass);
}

.scroll-pillar__number {
    font-family: var(--font-display);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--brass);
    line-height: 1;
    margin-bottom: 0.6rem;
    text-shadow: 0 0 24px rgba(212, 164, 74, 0.25);
}

.scroll-pillar__title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--paper);
    margin-bottom: 0.5rem;
    letter-spacing: -0.01em;
}

.scroll-pillar__desc {
    font-family: var(--font);
    font-size: 0.88rem;
    line-height: 1.62;
    color: rgba(250, 250, 249, 0.52);
}


/* ═══════════════════════════════════════════════════════════════════
   9. PANEL-SPECIFIC: EXISTING OPERATORS — horizontal evidence cards
   ═══════════════════════════════════════════════════════════════════ */

.scroll-timeline {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1.2rem;
    position: relative;
    padding-top: 2.8rem;
    margin-top: 3rem;
}

/* Connecting brass line behind step circles */
.scroll-timeline::before {
    content: '';
    position: absolute;
    top: calc(2.8rem + 18px);  /* vertically centred on step circle */
    left: calc(18px + 1rem);   /* start from first circle center */
    right: calc(18px + 1rem);  /* end at last circle center */
    height: 1px;
    background: rgba(212, 164, 74, 0.3);
}

.scroll-timeline__step {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    z-index: 1;
}

.scroll-timeline__circle {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 2px solid var(--brass);
    background: var(--ink);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--brass);
    margin-bottom: 1.2rem;
    flex-shrink: 0;
}

.scroll-timeline__title {
    font-family: var(--font-display);
    font-size: 0.96rem;
    font-weight: 600;
    color: var(--paper);
    margin-bottom: 0.45rem;
    letter-spacing: -0.01em;
}

.scroll-timeline__desc {
    font-family: var(--font);
    font-size: 0.82rem;
    line-height: 1.56;
    color: rgba(250, 250, 249, 0.48);
    max-width: 18rem;
}


/* ═══════════════════════════════════════════════════════════════════
   10. PANEL-SPECIFIC: MAP FEATURES — split layout
   ═══════════════════════════════════════════════════════════════════ */

[data-panel="map-features"] .scroll-content__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.scroll-features-intro {
    padding-right: 1rem;
}

.scroll-features-intro .scroll-content__title {
    margin-bottom: 1rem;
}

.scroll-features-intro .scroll-content__body {
    max-width: 100%;
}

.scroll-features-list {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
}

.scroll-feature-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.1rem 1.2rem;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: background 0.25s;
}

.scroll-feature-item:hover {
    background: rgba(255, 255, 255, 0.06);
}

.scroll-feature-item__number {
    font-family: var(--font-mono);
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--brass);
    letter-spacing: 0.06em;
    min-width: 1.6rem;
    padding-top: 0.15rem;
    flex-shrink: 0;
}

.scroll-feature-item__content {
    flex: 1;
}

.scroll-feature-item__title {
    font-family: var(--font-display);
    font-size: 0.94rem;
    font-weight: 600;
    color: var(--paper);
    margin-bottom: 0.25rem;
}

.scroll-feature-item__desc {
    font-family: var(--font);
    font-size: 0.82rem;
    line-height: 1.56;
    color: rgba(250, 250, 249, 0.48);
}


/* ═══════════════════════════════════════════════════════════════════
   11. PANEL-SPECIFIC: FAQ — light panel with accordion
   ═══════════════════════════════════════════════════════════════════ */

[data-panel="faq"] .scroll-content {
    max-width: 760px;
    margin: 0 auto;
}

[data-panel="faq"] .scroll-content__title {
    color: var(--ink);
    text-align: center;
}

[data-panel="faq"] .scroll-content__kicker {
    text-align: center;
}

/* Accordion items */
.scroll-faq-list {
    margin-top: 2.4rem;
    display: flex;
    flex-direction: column;
}

.scroll-faq-item {
    border-top: 1px solid var(--rule);
}

.scroll-faq-item:last-child {
    border-bottom: 1px solid var(--rule);
}

.scroll-faq-item__trigger {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.3rem 0.2rem;
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--ink);
    text-align: left;
    line-height: 1.35;
    transition: color 0.2s;
}

.scroll-faq-item__trigger:hover {
    color: var(--brass-deep);
}

.scroll-faq-item__trigger:focus-visible {
    outline: 2px solid var(--brass);
    outline-offset: 2px;
    border-radius: 2px;
}

.scroll-faq-item__icon {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    margin-left: 1rem;
    color: var(--mute);
    transition: transform 0.3s var(--motion-ease-settle);
}

.scroll-faq-item[aria-expanded="true"] .scroll-faq-item__icon {
    transform: rotate(45deg);
}

.scroll-faq-item__answer {
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.35s var(--motion-ease-settle),
                padding 0.35s var(--motion-ease-settle);
    padding: 0 0.2rem;
}

.scroll-faq-item[aria-expanded="true"] .scroll-faq-item__answer {
    max-height: 400px;
    padding: 0 0.2rem 1.4rem;
}

.scroll-faq-item__answer p {
    font-family: var(--font);
    font-size: 0.92rem;
    line-height: 1.68;
    color: var(--char);
}


/* ═══════════════════════════════════════════════════════════════════
   12. PANEL-SPECIFIC: CTA — dramatic close
   ═══════════════════════════════════════════════════════════════════ */

[data-panel="cta"] .scroll-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 8rem;
    padding-bottom: 8rem;
}

[data-panel="cta"] .scroll-content__title {
    font-size: clamp(2rem, 4.5vw, 3.4rem);
    max-width: 36rem;
}

[data-panel="cta"] .scroll-content__body {
    text-align: center;
    margin-bottom: 2.4rem;
    max-width: 30rem;
}

/* Brass accent line sweeping across the CTA panel */
[data-panel="cta"] .scroll-bg::after {
    content: '';
    position: absolute;
    top: 50%;
    left: -10%;
    width: 120%;
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(212, 164, 74, 0.05) 20%,
        rgba(212, 164, 74, 0.22) 50%,
        rgba(212, 164, 74, 0.05) 80%,
        transparent 100%
    );
    transform: rotate(-2deg);
    pointer-events: none;
}

/* CTA button */
.scroll-cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    text-decoration: none;
    color: var(--paper);
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.14);
    padding: 0.92rem 2.4rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.3s var(--motion-ease-settle),
                border-color 0.3s var(--motion-ease-settle),
                color 0.3s var(--motion-ease-settle);
}

.scroll-cta-btn:hover,
.scroll-cta-btn:focus-visible {
    background: var(--brass);
    border-color: var(--brass);
    color: var(--ink);
}

.scroll-cta-btn:focus-visible {
    outline: 2px solid var(--brass);
    outline-offset: 3px;
}

.scroll-cta-btn:active {
    background: var(--brass-deep);
    border-color: var(--brass-deep);
}


/* ═══════════════════════════════════════════════════════════════════
   13. UTILITY CLASSES
   ═══════════════════════════════════════════════════════════════════ */

.scroll-highlight {
    color: var(--paper);
}

/* On light panels, highlight flips to ink */
[data-panel="faq"] .scroll-highlight {
    color: var(--ink);
}

.scroll-brass {
    color: var(--brass);
}

.scroll-fade-up {
    opacity: clamp(0, var(--progress, 0) * 6.667, 1);
    transform: translateY(calc((1 - clamp(0, var(--progress, 0) * 6.667, 1)) * 24px));
    will-change: opacity, transform;
}


/* ═══════════════════════════════════════════════════════════════════
   14. RESPONSIVE — TABLET (≤ 1024px)
   ═══════════════════════════════════════════════════════════════════ */

@media (max-width: 1024px) {
    .scroll-content {
        padding: 5rem 2rem;
    }

    [data-panel="problem"] .scroll-content__grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.2rem;
    }

    [data-panel="engine"] .scroll-content__grid {
        gap: 1.4rem;
    }

    [data-panel="map-features"] .scroll-content__grid {
        gap: 2.8rem;
    }
}


/* ═══════════════════════════════════════════════════════════════════
   15. RESPONSIVE — MOBILE (≤ 768px)
   ═══════════════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
    .scroll-panel {
        min-height: 100svh;   /* safe viewport height */
    }

    .scroll-content {
        padding: 4rem 1.4rem;
    }

    .scroll-content__title {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }

    .scroll-content__body {
        font-size: 0.92rem;
    }

    /* Problem: stack stat cards */
    [data-panel="problem"] .scroll-content__grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .scroll-stat-card {
        padding: 1.4rem 1.2rem;
    }

    .scroll-stat-card__number {
        font-size: 2rem;
    }

    /* Engine: stack pillars */
    [data-panel="engine"] .scroll-content__grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .scroll-pillar {
        padding: 1.4rem 1rem 1.2rem;
    }

    /* Timeline: vertical on mobile */
    .scroll-timeline {
        flex-direction: column;
        padding-top: 0;
        gap: 0;
    }

    .scroll-timeline::before {
        top: 0;
        bottom: 0;
        left: 17px;
        right: auto;
        width: 1px;
        height: auto;
    }

    .scroll-timeline__step {
        flex-direction: row;
        align-items: flex-start;
        text-align: left;
        padding-left: 0;
        gap: 1rem;
        padding-bottom: 1.8rem;
    }

    .scroll-timeline__circle {
        margin-bottom: 0;
    }

    .scroll-timeline__desc {
        max-width: 100%;
    }

    /* Map features: single column */
    [data-panel="map-features"] .scroll-content__grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .scroll-features-intro {
        padding-right: 0;
    }

    /* CTA */
    [data-panel="cta"] .scroll-content {
        padding-top: 5rem;
        padding-bottom: 5rem;
    }

    .scroll-cta-btn {
        width: 100%;
        justify-content: center;
    }

    /* Reduce edge blends on small screens */
    .scroll-panel::before,
    .scroll-panel::after {
        height: 90px;
    }
}


/* ═══════════════════════════════════════════════════════════════════
   16. RESPONSIVE — SMALL MOBILE (≤ 480px)
   ═══════════════════════════════════════════════════════════════════ */

@media (max-width: 480px) {
    .scroll-content {
        padding: 3rem 1rem;
    }

    .scroll-content__title {
        font-size: clamp(1.3rem, 7vw, 1.7rem);
    }

    .scroll-content__kicker {
        font-size: 0.6rem;
    }

    [data-panel="mission"] .scroll-content__title {
        font-size: clamp(1.4rem, 7vw, 1.8rem);
    }

    [data-panel="cta"] .scroll-content__title {
        font-size: clamp(1.4rem, 7vw, 2rem);
    }

    .scroll-stat-card__number {
        font-size: 1.6rem;
    }

    .scroll-pillar__number {
        font-size: 1.6rem;
    }

    /* Hide decorative edge overlays at smallest breakpoint */
    .scroll-panel::before,
    .scroll-panel::after {
        display: none;
    }

    /* CTA brass sweep hidden at small sizes */
    [data-panel="cta"] .scroll-bg::after {
        display: none;
    }
}


/* ═══════════════════════════════════════════════════════════════════
   17. REDUCED MOTION
   ═══════════════════════════════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
    .scroll-content {
        opacity: 1 !important;
        transform: none !important;
        will-change: auto;
    }

    .scroll-panel .scroll-content__kicker,
    .scroll-panel .scroll-content__title,
    .scroll-panel .scroll-content__body,
    .scroll-panel .scroll-content__grid,
    .scroll-panel .scroll-timeline,
    .scroll-panel .scroll-faq-list,
    .scroll-panel .scroll-cta-btn {
        opacity: 1 !important;
        transform: none !important;
        transition: none;
    }

    .scroll-fade-up {
        opacity: 1 !important;
        transform: none !important;
        will-change: auto;
    }

    .scroll-faq-item__answer {
        transition: none;
    }

    .scroll-faq-item__icon {
        transition: none;
    }

    .scroll-cta-btn {
        transition: none;
    }

    .scroll-stat-card {
        transition: none;
    }

    .scroll-pillar {
        transition: none;
    }

    .scroll-feature-item {
        transition: none;
    }
}