/* =============================================================
   husbikes.com — Pagina prodotto V1 E-Bike
   Mood: scaffold KTM SX-E + identità HUS (giallo/blu + freccia
   tonda Marco-style + foto reali). 4 macro-sezioni numerate,
   ognuna è un mini carousel con tab Trefecta-style sotto.
   ============================================================= */


/* =============================================================
   ANIMAZIONI REVEAL
   ============================================================= */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition:
        opacity 700ms cubic-bezier(0.22, 1, 0.36, 1),
        transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
    will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.reveal[style*="--reveal-delay"] { transition-delay: var(--reveal-delay); }
@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
}


/* =============================================================
   ARROW-BTN — pallino con freccia (asset SVG completo Marco)
   Switch on hover (no transform/scale, solo opacity)
   ============================================================= */
.arrow-btn {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    line-height: 0;
}
.arrow-btn img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    transition: opacity 150ms ease;
}
.arrow-btn__hover { opacity: 0; }
.btn-arrow:hover  .arrow-btn__default,
.v1-final__card:hover .arrow-btn__default { opacity: 0; }
.btn-arrow:hover  .arrow-btn__hover,
.v1-final__card:hover .arrow-btn__hover   { opacity: 1; }

.arrow-btn--small { width: 36px; height: 36px; }


/* =============================================================
   BTN-ARROW — CTA inline (testo + arrow-btn accanto)
   ============================================================= */
.btn-arrow {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-3);
    text-decoration: none;
    font-family: var(--font-display);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-body);
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
    line-height: 1;
    cursor: pointer;
    background: transparent;
    border: none;
    padding: var(--sp-2) 0;
    transition: color var(--t-fast);
}
.btn-arrow--light { color: var(--color-white); }
.btn-arrow--light:hover { color: var(--color-accent); }
.btn-arrow--dark  { color: var(--color-primary); }
.btn-arrow--dark:hover { color: var(--color-primary-dark); }

.btn-arrow--small {
    font-size: var(--fs-small);
    gap: var(--sp-2);
    padding: var(--sp-1) 0;
}


/* =============================================================
   HEADER STICKY — scuro semi-trasparente
   ============================================================= */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-header);
    background: rgba(25, 93, 165, 0.55);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: background var(--t-base), box-shadow var(--t-base);
}
.site-header.is-scrolled {
    background: rgba(25, 93, 165, 0.95);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.site-header__inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--sp-3) var(--container-pad);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-3);
}
.site-header__logo { display: block; flex-shrink: 0; position: relative; z-index: 2; }
.site-header__logo img { width: clamp(120px, 13vw, 160px); height: auto; }
.site-header__cta { flex-shrink: 0; display: none; }
@media (min-width: 768px) { .site-header__cta { display: block; } }

.site-nav__list {
    display: none;
    gap: var(--sp-5);
    font-family: var(--font-display);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-small);
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
}
@media (min-width: 1024px) { .site-nav__list { display: flex; } }

.site-nav__list a {
    color: var(--color-white);
    opacity: 0.9;
    padding: var(--sp-2) 0;
    transition: opacity var(--t-fast), color var(--t-fast);
    position: relative;
}
.site-nav__list a:hover { opacity: 1; color: var(--color-accent); }
.site-nav__list a[aria-current="page"] { color: var(--color-accent); opacity: 1; }
.site-nav__list a::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: -2px;
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--t-base);
}
.site-nav__list a:hover::after,
.site-nav__list a[aria-current="page"]::after { transform: scaleX(1); }

.site-nav__toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    align-items: center;
    cursor: pointer;
    background: transparent;
    border: none;
    padding: 0;
    margin-left: auto;
    position: relative;
    z-index: 2;
}
@media (min-width: 1024px) { .site-nav__toggle { display: none; } }
.site-nav__toggle-bar {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-white);
    transition: transform var(--t-base), opacity var(--t-fast);
}
.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(2) { opacity: 0; }
.site-nav__toggle[aria-expanded="true"] .site-nav__toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 1023px) {
    .site-nav__list.is-open {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 70px;
        left: 0; right: 0;
        background: var(--color-grey-900);
        padding: var(--sp-5) var(--container-pad);
        gap: var(--sp-3);
        font-size: 1.25rem;
        z-index: calc(var(--z-header) - 1);
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        box-shadow: var(--shadow-lg);
    }
    .site-nav__list.is-open a {
        opacity: 1;
        padding: var(--sp-3) 0;
        border-bottom: 1px solid rgba(255, 255, 255, 0.10);
    }
}


/* =============================================================
   1. HERO — nome modello grande + sottotitolo small + scroll cue
   No CTA: il visitatore scopre il prodotto prima
   ============================================================= */
.v1-hero {
    position: relative;
    min-height: clamp(540px, 92vh, 900px);
    display: flex;
    align-items: flex-end;
    justify-content: flex-start;
    overflow: hidden;
    color: var(--color-white);
    isolation: isolate;
    background: var(--color-grey-900);
}
.v1-hero__media {
    position: absolute;
    inset: 0;
    z-index: -2;
    overflow: hidden;
}
.v1-hero__photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: 25% center;
    display: block;
}
@media (min-width: 768px) {
    .v1-hero__photo { object-position: center; }
}
.v1-hero__overlay {
    position: absolute;
    inset: 0;
    z-index: -1;
    background:
        linear-gradient(180deg,
            transparent 0%,
            transparent 45%,
            rgba(10, 14, 23, 0.55) 75%,
            rgba(10, 14, 23, 0.92) 100%);
}

.v1-hero__inner {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: clamp(var(--sp-7), 10vw, var(--sp-9)) var(--container-pad) clamp(var(--sp-6), 8vw, var(--sp-8));
}

.v1-hero__eyebrow {
    display: inline-block;
    font-family: var(--font-display);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-small);
    letter-spacing: var(--ls-wider);
    text-transform: uppercase;
    color: var(--color-accent);
    margin: 0 0 var(--sp-3);
    text-shadow: 0 1px 12px rgba(0, 0, 0, 0.5);
}

/* H1 nome modello — grande, dominante */
.v1-hero__title {
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-style: italic;
    font-size: clamp(3rem, 7vw + 0.5rem, 6.5rem);
    line-height: 0.95;
    letter-spacing: -0.025em;
    text-transform: uppercase;
    color: var(--color-white);
    margin: 0 0 var(--sp-3);
    text-shadow: 0 2px 30px rgba(0, 0, 0, 0.7);
}

/* Sottotitolo (slogan) — una sola riga, no letter-spacing */
.v1-hero__sub {
    font-family: var(--font-display);
    font-weight: var(--fw-semibold);
    font-size: clamp(1rem, 0.6vw + 0.95rem, 1.375rem);
    line-height: var(--lh-snug);
    letter-spacing: 0;
    color: rgba(255, 255, 255, 0.92);
    margin: 0;
    max-width: none;
    white-space: normal;
    text-shadow: 0 1px 12px rgba(0, 0, 0, 0.5);
}
.v1-hero__sub .accent { color: var(--color-accent); }

/* Scroll cue: linea che pulsa */
.v1-hero__scroll {
    position: absolute;
    bottom: var(--sp-4);
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-2);
    color: var(--color-white);
    text-decoration: none;
    font-family: var(--font-display);
    font-size: var(--fs-xs);
    text-transform: uppercase;
    letter-spacing: var(--ls-wider);
    opacity: 0.75;
    transition: opacity var(--t-fast), transform var(--t-base);
}
.v1-hero__scroll:hover { opacity: 1; transform: translateX(-50%) translateY(4px); color: var(--color-accent); }
.v1-hero__scroll-text { display: block; }
.v1-hero__scroll-line {
    display: block;
    width: 1px;
    height: 36px;
    background: currentColor;
    animation: scroll-pulse 2s ease-in-out infinite;
    transform-origin: top;
}
@keyframes scroll-pulse {
    0%, 100% { transform: scaleY(0.4); opacity: 0.3; }
    50%      { transform: scaleY(1);   opacity: 1; }
}
@media (max-width: 540px) { .v1-hero__scroll { display: none; } }


/* =============================================================
   2. INTRO — single-column: foto top centrata + testo Stromer-style
   ============================================================= */
.v1-intro {
    background: var(--color-grey-50);
    padding: clamp(var(--sp-6), 5vw, var(--sp-7)) 0 clamp(var(--sp-6), 8vw, var(--sp-8));
}
.v1-intro__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-4);
}

/* Foto V1 + watermark, centrata in unica colonna */
.v1-intro__media {
    position: relative;
    width: 100%;
    max-width: 600px;
    aspect-ratio: 7 / 6;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    isolation: isolate;
}
.v1-intro__watermark {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0.8;
    z-index: 1;
    pointer-events: none;
}
.v1-intro__bike {
    position: relative;
    z-index: 2;
    max-width: min(520px, 100%);
    max-height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 30px 50px rgba(25, 93, 165, 0.18));
}

/* Testo descrittivo sotto la foto (stile Stromer ST7: 980px wide, ~26px font, 4 righe) */
.v1-intro__copy {
    max-width: 980px;
    margin: 0 auto;
    text-align: center;
    font-family: var(--font-body);
    font-size: clamp(1.0625rem, 0.85vw + 0.95rem, 1.625rem);
    font-weight: var(--fw-semibold);
    line-height: 1.3;
    letter-spacing: -0.02em;
    color: #000000;
    padding: 0 var(--sp-3);
}
.v1-intro__copy strong { font-weight: var(--fw-black); color: var(--color-primary); }


/* =============================================================
   WIDE PHOTO — separator full-bleed cinematico
   ============================================================= */
.v1-wide {
    position: relative;
    margin: 0;
    width: 100%;
    aspect-ratio: 21 / 9;
    overflow: hidden;
    background: var(--color-grey-900);
}
.v1-wide img {
    position: absolute;
    inset: -20% 0;
    width: 100%;
    height: 140%;
    object-fit: cover;
    object-position: center;
    display: block;
    will-change: transform;
}
@media (max-width: 768px) { .v1-wide { aspect-ratio: 4 / 3; } }


/* =============================================================
   FEATURE SECTION — 4 macro-sezioni numerate
   ============================================================= */
.v1-feature {
    background: var(--color-white);
    padding: clamp(var(--sp-7), 8vw + 1rem, var(--sp-9)) 0 clamp(var(--sp-7), 8vw + 1rem, var(--sp-9));
    position: relative;
}

.v1-feature__head {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    margin-bottom: clamp(var(--sp-3), 4vw, var(--sp-7));
    padding: var(--sp-3) var(--sp-4) var(--sp-3) var(--sp-3);
    background: var(--color-primary);
}
.v1-feature__num,
.v1-feature__cat { align-self: baseline; }
.v1-feature__arrow {
    margin-left: auto;
    width: clamp(18px, 3vw, 26px);
    height: auto;
    display: block;
    flex-shrink: 0;
}
.v1-feature__num {
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-style: italic;
    font-size: clamp(1.375rem, 1.5vw + 0.6rem, 1.875rem);
    line-height: 1;
    letter-spacing: -0.02em;
    color: var(--color-accent);
    margin: 0;
}
.v1-feature__cat {
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-style: italic;
    font-size: clamp(1.375rem, 1.5vw + 0.6rem, 1.875rem);
    line-height: 1;
    letter-spacing: -0.02em;
    text-transform: uppercase;
    color: var(--color-white);
    margin: 0;
}


/* =============================================================
   FEATURE TABS — carousel + tab Trefecta-style sotto + frecce ai bordi
   ============================================================= */
.feature-tabs { position: relative; }

.feature-tabs__stack {
    position: relative;
    display: grid;
    margin-bottom: var(--sp-4);
    touch-action: pan-y;
}
.feature-tabs__stack > * { grid-area: 1 / 1; }

.feature-slide {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sp-6);
    align-items: start;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 220ms ease-out, visibility 0s linear 220ms;
}
@media (min-width: 1024px) {
    .feature-slide { grid-template-columns: 1fr 1fr; gap: var(--sp-7); }
}
.feature-slide.is-active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: opacity 360ms ease-out, visibility 0s linear 0s;
    animation: feature-slide-in-right 620ms cubic-bezier(.16,.86,.4,1) both;
}
.feature-tabs__stack[data-direction="prev"] .feature-slide.is-active {
    animation-name: feature-slide-in-left;
}
@keyframes feature-slide-in-right {
    from { transform: translateX(48px); }
    to   { transform: translateX(0); }
}
@keyframes feature-slide-in-left {
    from { transform: translateX(-48px); }
    to   { transform: translateX(0); }
}
@media (prefers-reduced-motion: reduce) {
    .feature-slide.is-active { animation: none; }
}

/* Foto SENZA box: spazio uniforme tra slide (cover + drop-shadow) */
.feature-slide__media {
    aspect-ratio: 4 / 3;
    overflow: hidden;
    border-radius: var(--radius-md);
}
.feature-slide__media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
    filter: drop-shadow(0 30px 50px rgba(25, 93, 165, 0.18));
}

/* Frecce navigazione ai bordi laterali (KTM-style) */
.feature-arrow {
    position: absolute;
    top: 35%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    display: none;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-grey-300);
    z-index: 5;
    transition: color var(--t-base), transform var(--t-base);
    padding: 0;
}
@media (min-width: 1408px) { .feature-arrow { display: inline-flex; } }

.feature-arrow:hover { color: var(--color-primary); }
.feature-arrow:active { transform: translateY(-50%) scale(0.92); }

.feature-arrow svg { width: 32px; height: 32px; display: block; }

.feature-arrow--prev { left: -64px; }
.feature-arrow--next { right: -64px; }

/* Pesi invertiti: NAME grande prominente, SPEC piccolo secondario
   (per utente medio "di cosa parla" è più importante del valore tecnico) */
.feature-slide__name {
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-style: italic;
    font-size: clamp(2rem, 2.6vw + 0.6rem, 3rem);
    line-height: 1;
    letter-spacing: -0.025em;
    text-transform: uppercase;
    color: var(--color-grey-900);
    margin: 0 0 var(--sp-2);
}
.feature-slide__spec {
    font-family: var(--font-display);
    font-weight: var(--fw-semibold);
    font-size: 1.0625rem;
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
    color: var(--color-primary);
    margin: 0 0 var(--sp-4);
}
.feature-slide__copy {
    font-size: clamp(1rem, 0.3vw + 0.95rem, 1.0625rem);
    line-height: var(--lh-relaxed);
    color: var(--color-grey-700);
    margin: 0 0 var(--sp-4);
    max-width: 50ch;
    min-height: calc(3 * var(--lh-relaxed, 1.6) * 1em);
}
.feature-slide__copy strong {
    font-weight: var(--fw-semibold);
    color: var(--color-grey-900);
}

.feature-slide__specs {
    display: flex;
    flex-direction: column;
    list-style: none;
    padding: 0;
    margin: 0;
    border-top: 1px solid var(--color-grey-100);
    max-width: 480px;
}
.feature-slide__specs li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--sp-3);
    padding: var(--sp-3) 0;
    border-bottom: 1px solid var(--color-grey-100);
}
.feature-slide__specs strong {
    font-family: var(--font-display);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-small);
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
    color: var(--color-grey-500);
}
.feature-slide__specs span {
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-size: var(--fs-body);
    color: var(--color-grey-900);
    text-align: right;
}


/* ---------- Tab bar Trefecta-style: vertical, no border, no bg ---------- */
.feature-tabs__bar {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sp-4);
    /* Niente border-top, niente filetto sopra (richiesta Marco) */
}
@media (min-width: 600px) {
    .feature-tabs__bar {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: var(--sp-5);
    }
}

/* ---------- Mobile (<600px): tab bar SOPRA la slide, grid 1fr equispaziate + progress ---------- */
@media (max-width: 599px) {
    .feature-tabs {
        display: flex;
        flex-direction: column;
    }
    .feature-tabs__stack { order: 2; }
    .feature-tabs__bar { order: 0; }
    .feature-tabs__progress { order: 1; }

    .feature-tabs__bar {
        display: grid;
        grid-auto-flow: column;
        grid-auto-columns: 1fr;
        gap: var(--sp-2);
        padding: 0;
    }

    .feature-tabs__progress {
        margin: 0 0 var(--sp-4);
    }

    .feature-tab {
        min-width: 0;
        max-width: none;
        padding: var(--sp-2) var(--sp-1) 0;
        gap: 2px;
        /* icona+label centrate nella cella */
        justify-self: center;
        width: 100%;
    }
    .feature-tabs__bar .feature-tab__icon {
        width: 44px;
        height: 44px;
        margin-bottom: 0;
        color: var(--color-grey-300);
    }
    .feature-tabs__bar .feature-tab.is-active .feature-tab__icon { color: var(--color-primary); }
    .feature-tabs__bar .feature-tab__icon svg { width: 44px; height: 44px; }
    .feature-tabs__bar .feature-tab__name {
        font-size: 0.9rem;
        line-height: 1;
    }
    .feature-tabs__bar .feature-tab__desc { display: none; }
}

.feature-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--sp-2);
    padding: var(--sp-4) var(--sp-3) var(--sp-5);
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-grey-700);
    transition: color var(--t-base);
    position: relative;
}

.feature-tab__icon {
    width: 64px;
    height: 64px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--color-grey-300);
    transition: color var(--t-base);
    margin-bottom: var(--sp-2);
}
.feature-tab__icon svg { width: 56px; height: 56px; }

.feature-tab__name {
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-size: clamp(1rem, 0.7vw + 0.85rem, 1.25rem);
    line-height: 1;
    letter-spacing: -0.015em;
    text-transform: uppercase;
    color: var(--color-grey-300);
    transition: color var(--t-base);
}

.feature-tab__desc {
    font-size: 0.875rem;
    line-height: var(--lh-snug);
    color: var(--color-grey-500);
    max-width: 24ch;
    transition: color var(--t-base);
}

/* Desktop/tablet: tab orizzontale (icona a sinistra, testo a destra) per recuperare altezza */
@media (min-width: 600px) {
    .feature-tabs__bar { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
    .feature-tab {
        display: grid;
        grid-template-columns: auto 1fr;
        column-gap: var(--sp-3);
        row-gap: 2px;
        align-items: center;
        text-align: left;
        padding: var(--sp-3);
    }
    .feature-tab__icon {
        grid-column: 1;
        grid-row: 1 / 3;
        align-self: center;
        width: 46px;
        height: 46px;
        margin-bottom: 0;
    }
    .feature-tab__icon svg { width: 42px; height: 42px; }
    .feature-tab__name { grid-column: 2; grid-row: 1; align-self: end; }
    .feature-tab__desc { grid-column: 2; grid-row: 2; align-self: start; max-width: none; }
}

/* Hover (tab non attivo) */
.feature-tab:hover .feature-tab__icon { color: var(--color-primary-dark); }

/* Stato attivo */
.feature-tab.is-active .feature-tab__icon { color: var(--color-primary); }
.feature-tab.is-active .feature-tab__name { color: var(--color-primary); }
.feature-tab.is-active .feature-tab__desc { color: var(--color-grey-700); }

/* Progress bar autoplay sotto il tab attivo */
.feature-tab.is-active::after {
    content: "";
    position: absolute;
    left: 25%;
    right: 25%;
    bottom: 0;
    height: 3px;
    background: var(--color-accent);
    width: auto;
    transform-origin: left;
    animation: tab-progress var(--tab-progress-duration, 5500ms) linear forwards;
}
@keyframes tab-progress {
    from { transform: scaleX(0); }
    to   { transform: scaleX(1); }
}
@media (prefers-reduced-motion: reduce) {
    .feature-tab.is-active::after { animation: none; transform: scaleX(1); }
}

/* Variante: progress bar continua sotto la barra dei tab (segmento → segmento) */
.feature-tabs--bar-progress .feature-tab.is-active::after { display: none; }
.feature-tabs__progress {
    position: relative;
    height: 3px;
    background: var(--color-grey-100);
    overflow: hidden;
    pointer-events: none;
    margin-top: var(--sp-3);
}
.feature-tabs__progress::after {
    content: "";
    position: absolute;
    inset: 0;
    z-index: 2;
    pointer-events: none;
    background: repeating-linear-gradient(
        to right,
        transparent 0,
        transparent calc(var(--seg-width, 33.3333%) - 8px),
        var(--color-white) calc(var(--seg-width, 33.3333%) - 8px),
        var(--color-white) var(--seg-width, 33.3333%)
    );
}
.feature-tabs__progress-fill {
    position: absolute;
    top: 0;
    bottom: 0;
    left: var(--progress-left, 0%);
    width: var(--progress-width, 33.3333%);
    background: var(--color-accent);
    transform-origin: left center;
    transform: scaleX(0);
    animation: feature-bar-progress var(--tab-progress-duration, 5500ms) linear forwards;
    animation-play-state: paused;
}
/* Su mobile: progress singolo (no segmenti, fill unico per slide) */
@media (max-width: 599px) {
    .feature-tabs__progress::after { display: none; }
    .feature-tabs__progress-fill {
        left: 0;
        width: 100%;
    }
}
.feature-tabs--bar-progress.is-running .feature-tabs__progress-fill {
    animation-play-state: running;
}
@keyframes feature-bar-progress {
    from { transform: scaleX(0); }
    to   { transform: scaleX(1); }
}
@media (prefers-reduced-motion: reduce) {
    .feature-tabs__progress-fill { animation: none; transform: scaleX(1); }
}


/* =============================================================
   7. DETTAGLI TECNICI — 2 colonne lista, foto bg scurita blu
   ============================================================= */
.v1-tech {
    color: var(--color-white);
    padding: clamp(var(--sp-7), 10vw, var(--sp-9)) 0;
    background: var(--color-primary);
}

.v1-tech__photo { display: none; }

.v1-tech__inner { position: relative; }

.v1-tech__head {
    text-align: center;
    margin-bottom: var(--sp-4);
}
.v1-tech__title {
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-style: italic;
    font-size: clamp(2rem, 3vw + 0.5rem, 3rem);
    line-height: 1;
    letter-spacing: -0.025em;
    text-transform: uppercase;
    color: var(--color-white);
    margin: 0;
}
.v1-tech__model {
    margin: var(--sp-2) 0 0;
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-style: italic;
    font-size: clamp(1.1rem, 0.5vw + 1rem, 1.45rem);
    letter-spacing: var(--ls-wide);
    text-transform: uppercase;
    color: var(--color-accent);
}

/* =============================================================
   SECTION BAR — indice 4 sezioni sotto l'header, cross-device.
   Appare quando entri nella sezione 01 e sparisce dopo la 04.
   Desktop ha styling più generoso (max-width container, font più
   grande, padding più ampi); mobile è scrollabile orizzontalmente.
   ============================================================= */
.v1-section-bar {
    display: flex;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: calc(var(--z-header) - 1);
    background: #134e88;       /* blu HUS scurito per stacco da header */
    padding: 6px 12px;
    gap: 2px;
    overflow-x: auto;
    white-space: nowrap;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    transform: translateY(-110%);
    transition: transform 320ms cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.22);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.v1-section-bar::-webkit-scrollbar { display: none; }
.v1-section-bar.is-visible {
    transform: translateY(var(--header-h, 64px));
}

.v1-section-bar__btn {
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 10px;
    border-radius: 0;
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-style: italic;
    font-size: 0.8125rem;
    letter-spacing: -0.01em;
    text-transform: uppercase;
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: color var(--t-fast), border-color var(--t-fast);
}
.v1-section-bar__btn:hover,
.v1-section-bar__btn:focus-visible {
    background: transparent;
    color: var(--color-white);
}
.v1-section-bar__btn.is-current {
    background: transparent;
    color: var(--color-white);
    border-bottom-color: var(--color-accent);
}
.v1-section-bar__num {
    font-size: 1rem;
    font-weight: var(--fw-black);
    opacity: 1;
    padding: 0;
    background: none;
    border-radius: 0;
    line-height: 1;
    color: rgba(255, 255, 255, 0.5);
}
.v1-section-bar__btn.is-current .v1-section-bar__num {
    background: none;
    color: var(--color-accent);
}

/* DESKTOP refinement: barra sottile, numeri in evidenza, niente box pillola */
@media (min-width: 1024px) {
    .v1-section-bar {
        padding: 7px 24px;
        gap: 4px;
        justify-content: center;
        overflow-x: visible;
        white-space: normal;
    }
    .v1-section-bar__btn {
        padding: 6px 16px;
        font-size: 0.875rem;
        gap: 7px;
    }
    .v1-section-bar__num {
        font-size: 1.0625rem;
        padding: 0;
    }
}


/* ---------- Size switcher (eyebrow + pill 12"/16") — compatto, no box ---------- */
.size-switcher {
    margin: 15px auto calc(var(--sp-4) + 15px);
    text-align: center;
}
.size-switcher__eyebrow {
    font-family: var(--font-display);
    font-weight: var(--fw-semibold);
    font-size: 0.9375rem;
    letter-spacing: var(--ls-wider);
    text-transform: uppercase;
    color: var(--color-white);
    margin: 0 0 var(--sp-2);
}

.size-switcher__pills {
    position: relative;
    display: inline-flex;
    background: rgba(0, 0, 0, 0.25);
    border-radius: 999px;
    padding: 4px;
    margin: 0 auto;
    isolation: isolate;
}
.size-switcher__pill {
    position: relative;
    z-index: 1;
    background: transparent;
    border: none;
    cursor: pointer;
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-style: italic;
    font-size: 1rem;
    letter-spacing: -0.01em;
    color: rgba(255, 255, 255, 0.65);
    padding: 0.55rem 1.6rem;
    border-radius: 999px;
    transition: color var(--t-base);
    min-width: 72px;
}
.size-switcher__pill.is-active {
    color: var(--color-grey-900);
}
.size-switcher__pill-indicator {
    position: absolute;
    z-index: 0;
    top: 4px;
    bottom: 4px;
    left: 4px;
    width: calc(50% - 4px);
    background: var(--color-accent);
    border-radius: 999px;
    transition: transform 280ms cubic-bezier(0.4, 0, 0.2, 1);
}
/* Indicator slide: posizione calcolata da JS via --pill-index (0 = sinistra, 1 = destra...). */
.size-switcher__pill-indicator {
    transform: translateX(calc(var(--pill-index, 0) * 100%));
}

/* ---------- Lista statici (SX): font più piccolo, sono 10 voci ---------- */
.v1-tech__list--static .v1-tech__lbl { font-size: clamp(0.75rem, 0.2vw + 0.7rem, 0.875rem); }
.v1-tech__list--static .v1-tech__val { font-size: clamp(1rem, 0.5vw + 0.95rem, 1.25rem); }
.v1-tech__list--static li { padding: var(--sp-2) 0; gap: 2px; }

/* ---------- Static column: container scrollabile con fade-mask + chevron hint ---------- */
.v1-tech__static-col {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    min-width: 0;
}
.v1-tech__list-scroll {
    overflow-y: auto;
    overflow-x: hidden;
    padding-right: var(--sp-3); /* spazio per scrollbar */
    /* Mask di default (mid scroll): fade top + bottom */
    -webkit-mask-image: linear-gradient(180deg, transparent 0%, black 8%, black 92%, transparent 100%);
            mask-image: linear-gradient(180deg, transparent 0%, black 8%, black 92%, transparent 100%);
    transition: -webkit-mask-image 240ms ease, mask-image 240ms ease;
    /* Scrollbar Firefox/standard */
    scrollbar-width: thin;
    scrollbar-color: var(--color-accent) rgba(255, 255, 255, 0.08);
}
/* All'inizio: niente fade top (siamo all'alto) */
.v1-tech__list-scroll.is-at-top {
    -webkit-mask-image: linear-gradient(180deg, black 0%, black 92%, transparent 100%);
            mask-image: linear-gradient(180deg, black 0%, black 92%, transparent 100%);
}
/* In fondo: niente fade bottom */
.v1-tech__list-scroll.is-at-bottom {
    -webkit-mask-image: linear-gradient(180deg, transparent 0%, black 8%, black 100%);
            mask-image: linear-gradient(180deg, transparent 0%, black 8%, black 100%);
}
/* Lista corta (cape entra tutta): niente mask, niente scroll */
.v1-tech__list-scroll.is-at-top.is-at-bottom {
    -webkit-mask-image: none;
            mask-image: none;
}
/* Scrollbar WebKit (Chrome/Safari) custom giallo HUS */
.v1-tech__list-scroll::-webkit-scrollbar {
    width: 4px;
}
.v1-tech__list-scroll::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.06);
    border-radius: 2px;
}
.v1-tech__list-scroll::-webkit-scrollbar-thumb {
    background: var(--color-accent);
    border-radius: 2px;
}
.v1-tech__list-scroll::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent-dark, #d4c40d);
}

/* Chevron pulsante — invito a scorrere */
.v1-tech__scroll-hint {
    align-self: center;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 22px;
    margin-top: var(--sp-1);
    padding: 0;
    background: transparent;
    border: none;
    color: var(--color-accent);
    cursor: pointer;
    opacity: 0.85;
    animation: v1-chevron-bounce 1.6s ease-in-out infinite;
    transition: opacity 240ms ease, transform 240ms ease;
}
.v1-tech__scroll-hint svg {
    width: 100%;
    height: 100%;
    display: block;
}
.v1-tech__scroll-hint.is-hidden {
    opacity: 0;
    transform: translateY(-4px);
    pointer-events: none;
}
.v1-tech__scroll-hint:hover { opacity: 1; }
@keyframes v1-chevron-bounce {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(5px); }
}
@media (prefers-reduced-motion: reduce) {
    .v1-tech__scroll-hint { animation: none; }
}

/* MOBILE — niente lock altezza, niente mask, niente chevron (la pagina scorre nativamente) */
@media (max-width: 767px) {
    .v1-tech__list-scroll {
        max-height: none !important;
        overflow: visible;
        -webkit-mask-image: none;
                mask-image: none;
        padding-right: 0;
    }
    .v1-tech__scroll-hint { display: none; }
}

/* Lista dinamica (DX): mantiene la dimensione attuale, evidenzia "dato live" */
.v1-tech__val[data-spec] {
    /* Counter animation è gestito da JS — niente fade qui */
    font-variant-numeric: tabular-nums;
}

/* ---------- Bike image swap — generico per qualsiasi taglia (12/16, 18/20…) ---------- */
.v1-tech__bike-stage {
    position: relative;
    width: 100%;
    max-width: 420px;
    margin: 0 auto;
    display: block;
}
.v1-tech__bike-stage .v1-tech__bike {
    transition: opacity 300ms ease;
    object-fit: contain;
}
/* prima img: in flow, definisce l'altezza dello stage */
.v1-tech__bike-stage .v1-tech__bike:first-of-type {
    position: relative;
    z-index: 1;
}
/* img successive: assolute, sovrapposte */
.v1-tech__bike-stage .v1-tech__bike:not(:first-of-type) {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
}
/* Default: tutte nascoste, JS+HTML applicano .is-active alla corrente */
[data-size-switcher] [data-bike-size] { opacity: 0; }
[data-size-switcher] [data-bike-size].is-active { opacity: 1; }

/* ---------- Hotspot "altezza da terra" sul diagramma (placeholder finché non arriva il disegno) ---------- */
.v1-tech__hotspot {
    position: absolute;
    z-index: 3;
    width: 46px;
    height: 46px;
    padding: 0;
    border: none;
    background: transparent;
    transform: translate(-50%, -50%);
    cursor: pointer;
}
.v1-tech__hotspot::before {
    content: "";
    position: absolute;
    inset: 0;
    margin: auto;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--color-accent);
    border: 2px solid #fff;
    box-shadow: 0 1px 5px rgba(0, 0, 0, 0.4);
}
.v1-tech__hotspot::after {
    content: "";
    position: absolute;
    inset: 0;
    margin: auto;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--color-accent);
    animation: hus-hotspot-pulse 2s ease-out infinite;
}
@keyframes hus-hotspot-pulse {
    0%   { transform: scale(1);   opacity: 0.6; }
    70%  { transform: scale(2.8); opacity: 0;   }
    100% { transform: scale(2.8); opacity: 0;   }
}
@media (prefers-reduced-motion: reduce) {
    .v1-tech__hotspot::after { animation: none; }
}
.v1-tech__tip {
    position: absolute;
    z-index: 4;
    transform: translate(-50%, calc(-100% - 12px));
    background: var(--color-grey-900);
    color: #fff;
    padding: 8px 13px;
    border-radius: 10px;
    white-space: nowrap;
    text-align: center;
    box-shadow: 0 10px 26px rgba(0, 0, 0, 0.28);
    opacity: 0;
    visibility: hidden;
    transition: opacity 200ms ease, visibility 200ms ease;
    pointer-events: none;
}
.v1-tech__tip::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: -5px;
    width: 11px;
    height: 11px;
    background: var(--color-grey-900);
    transform: translateX(-50%) rotate(45deg);
}
.v1-tech__tip-size {
    display: block;
    font-size: 0.6875rem;
    font-weight: var(--fw-semibold);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    opacity: 0.75;
}
.v1-tech__tip-val {
    display: block;
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-style: italic;
    font-size: 1.05rem;
}
.v1-tech__tip-switch {
    display: inline-block;
    margin-top: 6px;
    padding: 0;
    background: none;
    border: none;
    color: var(--color-accent);
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-style: italic;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
    cursor: pointer;
    transition: opacity var(--t-fast);
}
.v1-tech__tip-switch:hover { opacity: 0.75; text-decoration: underline; }
.v1-tech__hotspot:hover ~ .v1-tech__tip,
.v1-tech__hotspot:focus-visible ~ .v1-tech__tip,
.v1-tech__tip:hover,
.v1-tech__bike-stage.is-tip-open .v1-tech__tip {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}


.v1-tech__grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sp-6);
    align-items: start;
    margin-bottom: var(--sp-7);
}
@media (min-width: 768px) {
    .v1-tech__grid {
        grid-template-columns: auto 1fr auto;
        column-gap: var(--sp-6);
        align-items: center;
    }
}
/* Mobile: prima i dati che CAMBIANO con lo switch ruota, poi il diagramma, infine i dati fissi */
@media (max-width: 767px) {
    .v1-tech__list--dynamic { order: 1; }
    .v1-tech__diagram { order: 2; }
    .v1-tech__static-col { order: 3; }
}

.v1-tech__diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--sp-4);
}
.v1-tech__diagram img {
    max-width: 100%;
    height: auto;
    display: block;
}
.v1-tech__pittogramma {
    width: clamp(60px, 6vw, 92px);
}

.v1-tech__list {
    display: flex;
    flex-direction: column;
    list-style: none;
    margin: 0;
    padding: 0;
}
@media (min-width: 768px) {
    .v1-tech__list { min-width: 280px; }
}
.v1-tech__list li {
    display: flex;
    flex-direction: column;
    gap: var(--sp-1);
    padding: var(--sp-3) 0;
}
.v1-tech__list li + li {
    border-top: 1px solid var(--color-accent);
}
.v1-tech__lbl {
    font-family: var(--font-display);
    font-weight: var(--fw-regular);
    font-size: clamp(0.875rem, 0.3vw + 0.8rem, 1rem);
    line-height: 1.2;
    text-transform: uppercase;
    letter-spacing: var(--ls-wide);
    color: var(--color-accent);
}
.v1-tech__val {
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-size: clamp(1.25rem, 0.8vw + 1.05rem, 1.625rem);
    line-height: 1.1;
    text-transform: lowercase;
    letter-spacing: -0.01em;
    color: var(--color-white);
}

.v1-tech__cta {
    text-align: center;
    position: relative;
    z-index: 1;
}


/* =============================================================
   8. CTA FINALI — link a Academy + Rivenditori
   ============================================================= */
.v1-final {
    background: var(--color-white);
    padding: clamp(var(--sp-6), 8vw, var(--sp-8)) 0;
}
.v1-final__inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sp-4);
}
@media (min-width: 768px) {
    .v1-final__inner { grid-template-columns: 1fr 1fr; gap: var(--sp-5); }
}

.v1-final__card {
    display: block;
    padding: var(--sp-6);
    background: var(--color-grey-50);
    border: 1px solid var(--color-grey-100);
    border-left: 4px solid var(--color-accent);
    border-radius: var(--radius-md);
    color: var(--color-grey-900);
    text-decoration: none;
    transition: transform var(--t-base), background var(--t-base), border-color var(--t-base);
    position: relative;
}
.v1-final__card:hover {
    transform: translateY(-4px);
    background: var(--color-white);
    border-color: var(--color-accent);
    box-shadow: var(--shadow-lg);
}
.v1-final__arrow {
    position: absolute;
    top: var(--sp-5);
    right: var(--sp-5);
}

.v1-final__eyebrow {
    font-family: var(--font-display);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-small);
    letter-spacing: var(--ls-wider);
    text-transform: uppercase;
    color: var(--color-primary);
    margin: 0 0 var(--sp-2);
}
.v1-final__title {
    font-family: var(--font-display);
    font-weight: var(--fw-black);
    font-style: italic;
    font-size: 1.75rem;
    line-height: 1;
    letter-spacing: -0.025em;
    text-transform: uppercase;
    color: var(--color-grey-900);
    margin: 0 0 var(--sp-2);
}
.v1-final__copy {
    color: var(--color-grey-500);
    line-height: var(--lh-snug);
    margin: 0;
    max-width: 38ch;
}


/* =============================================================
   FOOTER (riuso identico)
   ============================================================= */
.site-footer {
    background: var(--color-black);
    color: var(--color-white);
}
.site-footer__inner {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--sp-5);
    padding: var(--sp-7) var(--container-pad) var(--sp-5);
}
@media (min-width: 768px) {
    .site-footer__inner {
        grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
        gap: var(--sp-6);
    }
}
.site-footer__brand { display: flex; flex-direction: column; gap: var(--sp-3); }
.site-footer__logo { width: 160px; height: auto; }
.site-footer__claim {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.95rem;
    line-height: var(--lh-snug);
    max-width: 28ch;
}
.site-footer h3 {
    font-family: var(--font-display);
    font-weight: var(--fw-semibold);
    font-size: var(--fs-small);
    text-transform: uppercase;
    letter-spacing: var(--ls-wider);
    color: var(--color-accent);
    margin-bottom: var(--sp-3);
}
.site-footer__col ul { display: flex; flex-direction: column; gap: var(--sp-2); list-style: none; padding: 0; }
.site-footer__col a {
    color: var(--color-white);
    opacity: 0.85;
    font-size: 0.95rem;
    transition: opacity var(--t-fast), color var(--t-fast);
}
.site-footer__col a:hover { opacity: 1; color: var(--color-accent); }
.site-footer__col img { margin-bottom: var(--sp-2); }
.site-footer__credit {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    line-height: var(--lh-relaxed);
}
.site-footer__bottom {
    background: #000;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}
.site-footer__bottom-inner {
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
    align-items: center;
    text-align: center;
    padding: var(--sp-4) var(--container-pad);
    color: rgba(255, 255, 255, 0.6);
    font-size: var(--fs-xs);
}
@media (min-width: 768px) {
    .site-footer__bottom-inner { flex-direction: row; justify-content: space-between; text-align: left; }
}
.site-footer__legal-links a { color: rgba(255, 255, 255, 0.75); transition: color var(--t-fast); }
.site-footer__legal-links a:hover { color: var(--color-accent); }