/* Keep box sizing sane so widths never “mysteriously” exceed viewport */
    *,
    *::before,
    *::after {
        box-sizing: border-box
    }

    :root {
        --bg: #0B0E13;
        --on-bg: #E8EAED;
        --primary: #FF6A2B;
        --primary-2: #FFC34A;
        --surface: #11151D;
        --stroke: rgba(255, 255, 255, .08)
    }

    body {
        font-family: Inter, system-ui, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
        background: var(--bg);
        color: var(--on-bg);
        -webkit-font-smoothing: antialiased
    }

    h1,
    h2,
    h3 {
        font-family: Poppins, Inter, system-ui, Segoe UI, Roboto, Helvetica, Arial, sans-serif
    }

    /* elevations */
    .elev-1 {
        box-shadow: 0 1px 2px rgba(0, 0, 0, .24), 0 1px 3px rgba(0, 0, 0, .18)
    }

    .elev-2 {
        box-shadow: 0 8px 16px rgba(0, 0, 0, .32), 0 2px 6px rgba(0, 0, 0, .24)
    }

    .elev-3 {
        box-shadow: 0 24px 48px rgba(0, 0, 0, .38), 0 8px 16px rgba(0, 0, 0, .24)
    }

    .soft-outline {
        border: 1px solid var(--stroke)
    }

    .grad-primary {
        background-image: linear-gradient(135deg, var(--primary) 0%, #FF7E47 30%, #FF9B66 60%, var(--primary-2) 100%)
    }

    .grad-hero {
        background:
            radial-gradient(1200px 600px at 20% 10%, rgba(255, 195, 74, .20), transparent 60%),
            radial-gradient(900px 500px at 80% 20%, rgba(255, 106, 43, .28), transparent 70%),
            radial-gradient(800px 500px at 50% 95%, rgba(255, 126, 71, .18), transparent 70%),
            linear-gradient(180deg, #0B0E13 0%, #0C0F16 60%, #0B0E13 100%);
    }

    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        padding: .9rem 1.25rem;
        border-radius: 9999px;
        font-weight: 700;
        transition: transform .18s ease, box-shadow .18s ease, opacity .18s ease
    }

    .btn-primary {
        color: #111;
        background: linear-gradient(135deg, #FFD38A 0%, #FFC34A 35%, #FF8B4A 100%)
    }

    .btn-primary:hover {
        transform: translateY(-1px);
        box-shadow: 0 8px 18px rgba(255, 139, 74, .35)
    }

    .btn-tonal {
        background: rgba(255, 255, 255, .06);
        border: 1px solid var(--stroke)
    }

    .btn-tonal:hover {
        transform: translateY(-1px);
        box-shadow: 0 8px 18px rgba(0, 0, 0, .35)
    }

    .chip {
        padding: .35rem .7rem;
        border-radius: 9999px;
        font-weight: 600;
        font-size: .8rem
    }

    .chip-warn {
        background: rgba(255, 195, 74, .12);
        border: 1px solid rgba(255, 195, 74, .35);
        color: #FFD891
    }

    /* reveal + motion */
    @keyframes fadeUp {
        from {
            opacity: 0;
            transform: translateY(22px)
        }

        to {
            opacity: 1;
            transform: none
        }
    }

    .anim-up {
        animation: fadeUp .55s both
    }

    .delay-1 {
        animation-delay: .08s
    }

    .delay-2 {
        animation-delay: .16s
    }

    .delay-3 {
        animation-delay: .24s
    }

    /* content-visibility to skip offscreen work */
    .defer {
        content-visibility: auto;
        contain-intrinsic-size: 1px 1000px
    }

    /* mode rail */
    .mode-rail {
        overflow-x: auto;
        display: flex;
        gap: .5rem;
        padding: .25rem;
        scroll-snap-type: x mandatory;
        -ms-overflow-style: none;
        scrollbar-width: none;
        mask-image: linear-gradient(90deg, transparent 0, #000 24px, #000 calc(100% - 24px), transparent 100%)
    }

    .mode-rail::-webkit-scrollbar {
        display: none
    }

    .mode-tab {
        scroll-snap-align: start;
        transition: transform .18s, background-color .18s, opacity .18s
    }

    .mode-tab[aria-selected="true"] {
        background: rgba(255, 255, 255, .14);
        transform: translateY(-1px)
    }

    .mode-indicator {
        height: 3px;
        border-radius: 9999px;
        background: linear-gradient(90deg, #FFC34A, #FF7E47);
        transform-origin: left;
        transition: transform .25s ease, width .25s ease, left .25s ease
    }

    pre {
        background: rgba(255, 255, 255, .04);
        padding: .75rem 1rem;
        border-radius: .5rem;
        overflow-x: auto;
        border: 1px solid rgba(255, 255, 255, .06)
    }

    code {
        font-family: 'Fira Code', ui-monospace, Menlo, Consolas, monospace;
        font-size: .85rem
    }

    .section-gradient {
        background:
            radial-gradient(900px 300px at 20% 0%, rgba(255, 195, 74, .14), transparent 60%),
            radial-gradient(800px 400px at 80% 10%, rgba(255, 106, 43, .18), transparent 65%),
            linear-gradient(180deg, rgba(255, 255, 255, .02), rgba(0, 0, 0, 0));
    }

    .fx-card {
        position: relative;
        border-radius: 16px;
        background: rgba(255, 255, 255, .035);
        border: 1px solid rgba(255, 255, 255, .06);
        transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
        will-change: transform
    }

    .fx-card::before {
        content: "";
        position: absolute;
        inset: -1px;
        border-radius: 18px;
        background: conic-gradient(from 180deg, #FFC34A, #FF7E47, #FF9B66, #FFC34A);
        filter: blur(.5px);
        opacity: .25;
        transition: opacity .25s ease;
        -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
        -webkit-mask-composite: xor;
        mask-composite: exclude;
        padding: 1px
    }

    .fx-card:hover {
        transform: translateY(-6px) rotateX(.8deg) rotateY(-.8deg);
        border-color: rgba(255, 255, 255, .12)
    }

    .fx-card:hover::before {
        opacity: .5
    }

    .blob {
        position: absolute;
        filter: blur(40px);
        opacity: .28;
        pointer-events: none;
        background: radial-gradient(200px 120px at 50% 50%, rgba(255, 195, 74, .6), transparent 60%)
    }

    .blob--2 {
        background: radial-gradient(200px 120px at 50% 50%, rgba(255, 126, 71, .55), transparent 60%)
    }

    /* timeline */
    .timeline {
        position: relative
    }

    .timeline::before {
        content: "";
        position: absolute;
        left: 0;
        right: 0;
        top: 0;
        height: 4px;
        margin: 0 auto;
        width: clamp(260px, 70%, 680px);
        border-radius: 999px;
        background: linear-gradient(90deg, #2A2F3A, #2A2F3A);
        opacity: .7
    }

    .timeline__progress {
        position: absolute;
        left: 0;
        right: 0;
        top: 0;
        height: 4px;
        margin: 0 auto;
        width: clamp(260px, 70%, 680px);
        border-radius: 999px;
        background: linear-gradient(90deg, #FFC34A, #FF7E47);
        transform-origin: left;
        transform: scaleX(0)
    }

    /* Lazy YouTube placeholder */
    .yt-lite {
        position: relative;
        display: block;
        background: #000;
        border-radius: 0 0 1rem 1rem;
        overflow: hidden
    }

    .yt-lite::before {
        content: "";
        display: block;
        padding-top: 56.25%
    }

    .yt-lite>button {
        position: absolute;
        inset: 0;
        display: block;
        width: 100%;
        height: 100%;
        background-position: center;
        background-size: cover;
        background-repeat: no-repeat;
        border: 0;
        cursor: pointer
    }

    .yt-lite .ply {
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        width: 68px;
        height: 48px;
        background: rgba(28, 28, 28, .8);
        border-radius: 14px
    }

    .yt-lite .ply::before {
        content: "";
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-40%, -50%);
        border-style: solid;
        border-width: 10px 0 10px 16px;
        border-color: transparent transparent transparent #fff
    }

    @media (prefers-reduced-motion: reduce) {

        .mode-tab,
        .mode-indicator,
        .fx-card {
            transition: none !important
        }
    }

    /* Skip offscreen work for below-the-fold sections */
    .defer {
        content-visibility: auto;
        contain-intrinsic-size: 1px 1000px;
    }

    /* Lite YouTube shell (duplicate kept as-is from your original) */
    .yt-lite {
        position: relative;
        display: block;
        background: #000;
        border-radius: 0 0 1rem 1rem;
        overflow: hidden
    }

    .yt-lite::before {
        content: "";
        display: block;
        padding-top: 56.25%
    }

    .yt-lite>button {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
        background-position: center;
        background-size: cover;
        background-repeat: no-repeat;
        border: 0;
        cursor: pointer
    }

    .yt-lite .ply {
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-50%, -50%);
        width: 68px;
        height: 48px;
        background: rgba(28, 28, 28, .8);
        border-radius: 14px
    }

    .yt-lite .ply::before {
        content: "";
        position: absolute;
        left: 50%;
        top: 50%;
        transform: translate(-40%, -50%);
        border: solid transparent;
        border-width: 10px 0 10px 16px;
        border-left-color: #fff
    }

    #saleBanner {
        animation: pulseBanner 2s infinite;
    }

    @keyframes pulseBanner {

        0%,
        100% {
            opacity: 1;
        }

        50% {
            opacity: 0.75;
        }
    }

    /* ==== Mobile-only fixes (≤640px) ==== */
    @media (max-width: 640px) {

        /* Header: smaller logo & tighter spacing */
        header nav {
            padding: .75rem 1rem !important;
        }

        header img[alt="Interview Ignition Pro Logo"] {
            height: 56px !important;
        }

        /* ~h-14 */
        header .text-xl {
            font-size: 1.05rem;
        }

        /* Container should never exceed viewport and grid children must shrink */
        .container {
            max-width: 100% !important;
        }

        .grid>* {
            min-width: 0;
        }

        .lg\:col-span-5,
        .lg\:col-span-7 {
            min-width: 0;
        }

        /* Hero: safer heading size & paddings */
        .grad-hero .container {
            padding-left: 1rem !important;
            padding-right: 1rem !important;
        }

        .grad-hero {
            padding-bottom: 2.25rem;
        }

        h1 {
            font-size: clamp(1.9rem, 6vw, 2.6rem);
            line-height: 1.15;
            letter-spacing: -0.01em;
        }

        p,
        li {
            font-size: 1rem;
        }

        /* Buttons: comfy and full width where intended */
        .btn {
            padding: .8rem 1rem;
            font-weight: 700;
        }

        .btn-tonal {
            border-radius: 14px;
        }

        .chip {
            font-size: .75rem;
            padding: .3rem .55rem;
        }

        #download .btn {
            width: 100%;
        }

        [data-os] {
            width: 100%;
            justify-content: center;
            font-size: .95rem;
        }

        .flex.flex-wrap.items-center.gap-3.mt-6.anim-up.delay-3>span.btn {
            width: 100%;
            justify-content: center;
        }

        /* Right hero card gap when stacked */
        .lg\:col-span-5 {
            margin-top: 1.75rem;
        }

        /* Mode rail: keep within viewport and avoid mask clipping */
        .mode-rail {
            max-width: 100%;
            mask-image: none;
            -webkit-mask-image: none;
            padding-right: .25rem;
        }

        #modeIndicator {
            max-width: 100%;
        }

        /* Grids & sections: reduce gaps a bit */
        .grid {
            gap: 1rem;
        }

        #features,
        #how,
        #contact,
        #qa {
            padding-top: 3rem;
            padding-bottom: 3rem;
        }

        /* Code blocks readable on mobile */
        pre,
        code {
            font-size: .82rem;
        }

        /* Do NOT clip horizontally (prevents hero & rail cut-off) */
        .grad-hero,
        .section-gradient {
            overflow-x: visible;
        }
    }
      #saleBanner .pulse { animation: pulseBanner 2s infinite; }
  @keyframes pulseBanner { 0%,100%{opacity:1} 50%{opacity:.85} }