/*
  Machina Template
  https://templatemo.com/tm-632-machina
*/

/* ------------------------------------------------------------------ */
/* THE MACHINA // 167 - Hyper-Carbon and Neon Cyan design system      */
/* Bi-directional virtual scroll engine, vanilla HTML CSS JS          */
/* ------------------------------------------------------------------ */

:root {
    --void: #030508;
    /* hyper-carbon deep void */
    --panel: #060A10;
    /* raised carbon surface */
    --silver: #E2E8F0;
    /* cold silver text */
    --dim: rgba(226, 232, 240, 0.48);
    --faint: rgba(226, 232, 240, 0.22);
    --line: rgba(226, 232, 240, 0.10);
    --cyan: #00F0FF;
    /* neon cyan telemetry */
    --cyan-soft: rgba(0, 240, 255, 0.10);
    --cyan-glass: rgba(0, 240, 255, 0.05);
    --red: #FF003C;
    /* laser red micro interactions */
    --disp: 'Space Grotesk', sans-serif;
    --body: 'Inter', sans-serif;
    --ease-silk: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html,
body {
    height: 100%;
    overflow: hidden;
    /* virtual scroll engine owns the page */
    overscroll-behavior: none;
}

body {
    background: var(--void);
    color: var(--silver);
    font-family: var(--body);
    font-weight: 300;
    -webkit-font-smoothing: antialiased;
}

/* faint engineering grid behind everything */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        repeating-linear-gradient(to right, rgba(226, 232, 240, 0.025) 0 1px, transparent 1px 120px),
        repeating-linear-gradient(to bottom, rgba(226, 232, 240, 0.02) 0 1px, transparent 1px 120px);
    pointer-events: none;
    z-index: 0;
}

::selection {
    background: var(--cyan);
    color: var(--void);
}

a {
    color: inherit;
    text-decoration: none;
}

button {
    font-family: inherit;
    background: none;
    border: 0;
    color: inherit;
    cursor: pointer;
}

button:focus-visible,
a:focus-visible {
    outline: 1px solid var(--cyan);
    outline-offset: 3px;
}

/* ---------------------------------------------------------- */
/* STAGE AND TRACK PANELS                                      */
/* ---------------------------------------------------------- */

.stage {
    position: relative;
    z-index: 1;
}

.panel {
    position: fixed;
    top: 0;
    height: 100vh;
    width: 50%;
    display: flex;
    align-items: center;
    will-change: transform;
}

.t-left {
    left: 0;
}

.t-right {
    left: 50%;
}

.panel-inner {
    width: 100%;
    padding: 110px clamp(36px, 5vw, 84px);
}

/* center seam */
.seam {
    position: fixed;
    top: 0;
    left: 50%;
    width: 1px;
    height: 100vh;
    background: var(--line);
    z-index: 4;
    pointer-events: none;
}

.seam::after {
    content: "";
    position: absolute;
    left: -2px;
    top: 0;
    width: 5px;
    height: 56px;
    background: var(--cyan);
    opacity: 0.9;
    transform: translateY(0);
}

/* full-bleed media panels */
.panel-media {
    padding: 0;
    align-items: stretch;
}

.media-frame {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.media-frame img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    filter: grayscale(0.55) contrast(1.12) brightness(0.78);
}

/* cyan duotone wash to unify photography with the HUD */
.media-frame::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(160deg, rgba(0, 240, 255, 0.10), rgba(3, 5, 8, 0.55) 70%);
    mix-blend-mode: screen;
    pointer-events: none;
}

.media-tag {
    position: absolute;
    left: 28px;
    bottom: 26px;
    z-index: 2;
    font-family: var(--disp);
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--silver);
    background: rgba(3, 5, 8, 0.6);
    border: 1px solid var(--line);
    padding: 10px 14px;
    backdrop-filter: blur(4px);
}

.media-tag b {
    color: var(--cyan);
    font-weight: 500;
}

/* infinite scan line on the hero image */
.scanline {
    position: absolute;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--cyan);
    box-shadow: 0 0 14px rgba(0, 240, 255, 0.9), 0 0 40px rgba(0, 240, 255, 0.35);
    z-index: 2;
    animation: scanY 6s linear infinite;
}

@keyframes scanY {
    0% {
        top: -2px;
    }

    50% {
        top: 100%;
    }

    100% {
        top: -2px;
    }
}

/* ---------------------------------------------------------- */
/* SHARED TYPE PARTS                                           */
/* ---------------------------------------------------------- */

.eyebrow {
    display: flex;
    align-items: center;
    gap: 14px;
    font-family: var(--disp);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.34em;
    color: var(--cyan);
    margin-bottom: 30px;
}

.eyebrow::before {
    content: "";
    width: 34px;
    height: 1px;
    background: var(--cyan);
}

.lede {
    color: var(--dim);
    font-size: 14px;
    line-height: 1.85;
    letter-spacing: 0.02em;
    max-width: 46ch;
}

/* ---------------------------------------------------------- */
/* BLOCK 1 // TELEMETRY HERO                                   */
/* ---------------------------------------------------------- */

.hero-title {
    font-family: var(--disp);
    font-weight: 700;
    font-size: clamp(3.4rem, 6.4vw, 6.6rem);
    line-height: 0.94;
    letter-spacing: -0.02em;
    text-transform: uppercase;
    margin-bottom: 34px;
}

.hero-title .slash {
    color: var(--cyan);
}

.hero-title .thin {
    font-weight: 400;
    color: var(--dim);
}

.clock-shell {
    display: inline-flex;
    align-items: baseline;
    gap: 16px;
    border: 1px solid var(--line);
    border-left: 2px solid var(--cyan);
    padding: 16px 22px;
    margin: 38px 0 44px;
    background: rgba(6, 10, 16, 0.7);
}

.clock-label {
    font-family: var(--disp);
    font-size: 10px;
    letter-spacing: 0.3em;
    color: var(--dim);
}

#live-clock {
    font-family: var(--disp);
    font-weight: 500;
    font-size: clamp(1.3rem, 2vw, 1.8rem);
    letter-spacing: 0.08em;
    color: var(--cyan);
    font-variant-numeric: tabular-nums;
    min-width: 11ch;
}

#live-clock .ms {
    color: var(--red);
}

.spec-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    border-top: 1px solid var(--line);
}

.spec-cell {
    flex: 1 1 0;
    min-width: 120px;
    padding: 18px 18px 0 0;
    border-right: 1px solid var(--line);
    margin-right: 18px;
}

.spec-cell:last-child {
    border-right: 0;
    margin-right: 0;
}

.spec-cell .k {
    font-family: var(--disp);
    font-size: 10px;
    letter-spacing: 0.26em;
    color: var(--faint);
    display: block;
    margin-bottom: 8px;
}

.spec-cell .v {
    font-family: var(--disp);
    font-weight: 500;
    font-size: 1.25rem;
    color: var(--silver);
}

.spec-cell .v small {
    font-size: 0.7em;
    color: var(--cyan);
    margin-left: 4px;
}

/* ---------------------------------------------------------- */
/* BLOCK 2 // BLUEPRINT ACCORDION                              */
/* ---------------------------------------------------------- */

.section-title {
    font-family: var(--disp);
    font-weight: 700;
    font-size: clamp(2rem, 3.2vw, 3.2rem);
    line-height: 1.02;
    text-transform: uppercase;
    letter-spacing: -0.01em;
    margin-bottom: 18px;
}

.section-title .slash {
    color: var(--cyan);
}

.accordion {
    margin-top: 38px;
    border-top: 1px solid var(--line);
}

.acc-item {
    border: 1px solid transparent;
    border-bottom: 1px solid var(--line);
    transition: border-color 0.35s var(--ease-silk), background 0.35s var(--ease-silk);
}

.acc-item.open {
    border: 1px solid var(--cyan);
    background: var(--cyan-glass);
}

.acc-head {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 20px;
    text-align: left;
    padding: 22px 18px;
}

.acc-index {
    font-family: var(--disp);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--faint);
    transition: color 0.3s;
}

.acc-item.open .acc-index {
    color: var(--red);
}

.acc-title {
    flex: 1;
    font-family: var(--disp);
    font-weight: 500;
    font-size: 1.05rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

.acc-icon {
    position: relative;
    width: 14px;
    height: 14px;
    flex: 0 0 14px;
}

.acc-icon::before,
.acc-icon::after {
    content: "";
    position: absolute;
    background: var(--cyan);
    transition: transform 0.4s var(--ease-silk), background 0.3s;
}

.acc-icon::before {
    left: 0;
    top: 6px;
    width: 14px;
    height: 2px;
}

.acc-icon::after {
    left: 6px;
    top: 0;
    width: 2px;
    height: 14px;
}

.acc-item.open .acc-icon::after {
    transform: scaleY(0);
}

.acc-item.open .acc-icon::before {
    background: var(--red);
}

.acc-head:hover .acc-title {
    color: var(--cyan);
}

.acc-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.55s var(--ease-silk);
}

.acc-body p {
    padding: 0 18px 24px 51px;
    color: var(--dim);
    font-size: 13.5px;
    line-height: 1.85;
}

.acc-body .data-strip {
    display: flex;
    gap: 26px;
    padding: 0 18px 22px 51px;
    font-family: var(--disp);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--cyan);
}

/* blueprint photo panel - image, marker and data react to the accordion */
.bp-stage {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--panel);
}

.bp-img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.8s var(--ease-silk);
    filter: grayscale(0.55) contrast(1.12) brightness(0.75);
}

.bp-img.active {
    opacity: 1;
}

/* same cyan duotone wash as the other media panels */
.bp-stage::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(160deg, rgba(0, 240, 255, 0.10), rgba(3, 5, 8, 0.55) 70%);
    mix-blend-mode: screen;
    pointer-events: none;
    z-index: 1;
}

.bp-chip {
    position: absolute;
    top: 26px;
    left: 28px;
    z-index: 3;
    font-family: var(--disp);
    font-size: 11px;
    letter-spacing: 0.28em;
    color: var(--silver);
    background: rgba(3, 5, 8, 0.6);
    border: 1px solid var(--line);
    border-left: 2px solid var(--cyan);
    padding: 10px 14px;
    backdrop-filter: blur(4px);
}

/* target marker - repositions per accordion item */
.bp-marker {
    position: absolute;
    z-index: 3;
    left: 24%;
    top: 28%;
    transition: left 0.8s var(--ease-silk), top 0.8s var(--ease-silk);
}

.bp-ring {
    display: block;
    width: 16px;
    height: 16px;
    border: 1.5px solid var(--cyan);
    border-radius: 50%;
    box-shadow: 0 0 14px rgba(0, 240, 255, 0.7);
    position: relative;
    transition: border-color 0.2s;
}

/* expanding sonar pulse */
.bp-ring::after {
    content: "";
    position: absolute;
    inset: -1.5px;
    border: 1px solid var(--cyan);
    border-radius: 50%;
    animation: bpPulse 2.2s ease-out infinite;
}

@keyframes bpPulse {
    0% {
        transform: scale(1);
        opacity: 0.9;
    }

    100% {
        transform: scale(3.2);
        opacity: 0;
    }
}

.bp-hairline {
    position: absolute;
    left: 22px;
    top: 7.5px;
    width: 72px;
    height: 1px;
    background: var(--cyan);
    box-shadow: 0 0 8px rgba(0, 240, 255, 0.5);
}

.bp-data {
    position: absolute;
    left: 102px;
    top: -10px;
    white-space: nowrap;
    font-family: var(--disp);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--cyan);
    background: rgba(3, 5, 8, 0.7);
    border: 1px solid rgba(0, 240, 255, 0.35);
    padding: 8px 12px;
    backdrop-filter: blur(4px);
}

/* laser red blip on change */
.bp-marker.blip .bp-ring {
    border-color: var(--red);
    box-shadow: 0 0 14px rgba(255, 0, 60, 0.8);
}

.bp-marker.blip .bp-hairline {
    background: var(--red);
}

/* ---------------------------------------------------------- */
/* BLOCK 3 // 3D KINETIC CAROUSEL                              */
/* ---------------------------------------------------------- */

.carousel-panel {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    padding-top: 90px;
    padding-bottom: 80px;
}

.c3d-stage {
    width: 100%;
    height: 330px;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 1000px;
    cursor: grab;
    touch-action: pan-y;
    user-select: none;
    -webkit-user-select: none;
}

.c3d-stage.dragging {
    cursor: grabbing;
}

.c3d {
    position: relative;
    width: 230px;
    height: 300px;
    transform-style: preserve-3d;
}

.c3d-card {
    position: absolute;
    inset: 0;
    transform-style: preserve-3d;
    transition: opacity 0.2s linear;
}

/* two-sided cards: designed back face instead of mirrored text */
.card-face {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 22px;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}

.face-front {
    background: var(--cyan-glass);
    border: 1px solid var(--cyan);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    box-shadow: 0 0 50px rgba(0, 240, 255, 0.06) inset;
}

.face-back {
    transform: rotateY(180deg);
    align-items: center;
    justify-content: center;
    gap: 16px;
    background: rgba(6, 10, 16, 0.88);
    border: 1px dashed rgba(0, 240, 255, 0.35);
}

.face-back .back-id {
    font-family: var(--disp);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.34em;
    color: var(--cyan);
}

.face-back .back-bars {
    width: 90px;
    height: 30px;
    background: repeating-linear-gradient(to right, rgba(0, 240, 255, 0.55) 0 2px, transparent 2px 6px, rgba(0, 240, 255, 0.3) 6px 7px, transparent 7px 12px);
}

.face-back .back-label {
    font-family: var(--disp);
    font-size: 10px;
    letter-spacing: 0.3em;
    color: var(--faint);
}

.c3d-card .c-id {
    font-family: var(--disp);
    font-size: 10px;
    letter-spacing: 0.3em;
    color: var(--red);
}

.c3d-card .c-name {
    font-family: var(--disp);
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.c3d-card .c-fig {
    font-family: var(--disp);
    font-weight: 500;
    font-size: 2rem;
    color: var(--cyan);
}

.c3d-card .c-fig small {
    font-size: 0.5em;
    color: var(--dim);
    margin-left: 4px;
}

.c3d-card .c-desc {
    font-size: 11.5px;
    line-height: 1.7;
    color: var(--dim);
}

/* control deck */
.c3d-deck {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.c3d-status {
    font-family: var(--disp);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.28em;
    color: var(--silver);
}

.c3d-status b {
    color: var(--cyan);
    font-weight: 500;
}

.c3d-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.c3d-ctl,
.mod-btn {
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line);
    background: rgba(6, 10, 16, 0.7);
    transition: border-color 0.25s, color 0.25s, background 0.25s;
}

.c3d-ctl {
    width: 42px;
}

.c3d-ctl:hover {
    border-color: var(--red);
}

.chev-l,
.chev-r {
    width: 9px;
    height: 9px;
    border-left: 1.6px solid var(--cyan);
    border-bottom: 1.6px solid var(--cyan);
    transition: border-color 0.25s;
}

.chev-l {
    transform: rotate(45deg) translate(1px, -1px);
}

.chev-r {
    transform: rotate(-135deg) translate(1px, -1px);
}

.c3d-ctl:hover .chev-l,
.c3d-ctl:hover .chev-r {
    border-color: var(--red);
}

.mod-btn {
    min-width: 42px;
    padding: 0 10px;
    font-family: var(--disp);
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.2em;
    color: var(--dim);
}

.mod-btn:hover {
    color: var(--silver);
    border-color: rgba(226, 232, 240, 0.3);
}

.mod-btn.active {
    color: var(--red);
    border-color: var(--red);
}

/* play and pause glyphs drawn in CSS */
.ico-play {
    width: 0;
    height: 0;
    border-left: 9px solid var(--cyan);
    border-top: 6px solid transparent;
    border-bottom: 6px solid transparent;
}

.c3d-ctl.playing .ico-play {
    width: 8px;
    height: 12px;
    border-top: 0;
    border-bottom: 0;
    border-left: 3px solid var(--cyan);
    border-right: 3px solid var(--cyan);
}

.c3d-hint {
    font-family: var(--disp);
    font-size: 10px;
    letter-spacing: 0.3em;
    color: var(--faint);
}

.c3d-hint b {
    color: var(--cyan);
    font-weight: 500;
}

/* ---------------------------------------------------------- */
/* BLOCK 4 // SYSTEM TABS AND KINETIC TYPE                     */
/* ---------------------------------------------------------- */

.tab-rail {
    display: flex;
    border: 1px solid var(--line);
    margin: 40px 0 30px;
}

.tab-btn {
    flex: 1;
    padding: 18px 10px;
    font-family: var(--disp);
    font-weight: 500;
    font-size: 12px;
    letter-spacing: 0.22em;
    color: var(--dim);
    border-right: 1px solid var(--line);
    position: relative;
    transition: color 0.2s, background 0.2s;
}

.tab-btn:last-child {
    border-right: 0;
}

.tab-btn::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 100%;
    height: 2px;
    background: var(--red);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.35s var(--ease-silk);
}

.tab-btn:hover {
    color: var(--silver);
    background: rgba(226, 232, 240, 0.03);
}

.tab-btn.active {
    color: var(--red);
}

.tab-btn.active::after {
    transform: scaleX(1);
}

.tab-copy {
    min-height: 96px;
}

.tab-copy p {
    color: var(--dim);
    font-size: 13.5px;
    line-height: 1.85;
    max-width: 44ch;
}

.tab-meta {
    margin-top: 26px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.tab-chip {
    font-family: var(--disp);
    font-size: 10px;
    letter-spacing: 0.22em;
    color: var(--cyan);
    border: 1px solid rgba(0, 240, 255, 0.35);
    padding: 8px 14px;
}

.promo-line {
    margin-top: 46px;
    padding-top: 22px;
    border-top: 1px solid var(--line);
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--faint);
}

.promo-line a {
    color: var(--dim);
    border-bottom: 1px solid var(--faint);
    transition: color 0.2s, border-color 0.2s;
}

.promo-line a:hover {
    color: var(--cyan);
    border-color: var(--cyan);
}

/* kinetic outline typography */
.kinetic-panel {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: 0 clamp(30px, 4vw, 70px);
    overflow: hidden;
    background: radial-gradient(circle at 30% 70%, rgba(255, 0, 60, 0.05), transparent 55%);
}

.kinetic-label {
    font-family: var(--disp);
    font-size: 11px;
    letter-spacing: 0.34em;
    color: var(--red);
    margin-bottom: 22px;
}

.kinetic-value {
    font-family: var(--disp);
    font-weight: 700;
    font-size: clamp(3.4rem, 8vw, 9rem);
    line-height: 0.92;
    text-transform: uppercase;
    letter-spacing: -0.01em;
    color: transparent;
    -webkit-text-stroke: 1.5px var(--cyan);
    transition: opacity 0.18s ease, transform 0.18s ease, letter-spacing 0.18s ease;
    word-break: break-word;
}

.kinetic-value.swap {
    opacity: 0;
    transform: translateY(14px);
    letter-spacing: 0.06em;
}

.kinetic-sub {
    margin-top: 26px;
    font-family: var(--disp);
    font-size: 12px;
    letter-spacing: 0.26em;
    color: var(--dim);
}

.kinetic-sub b {
    color: var(--silver);
    font-weight: 500;
}

/* ---------------------------------------------------------- */
/* THE HUD OVERLAY                                             */
/* ---------------------------------------------------------- */

.hud {
    position: fixed;
    inset: 0;
    z-index: 20;
    pointer-events: none;
}

.hud-frame {
    position: absolute;
    inset: 14px;
    border: 1px solid var(--line);
}

/* corner brackets */
.hud-frame::before,
.hud-frame::after,
.hud-frame .ck::before,
.hud-frame .ck::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    border-color: var(--cyan);
    border-style: solid;
}

.hud-frame::before {
    top: -1px;
    left: -1px;
    border-width: 2px 0 0 2px;
}

.hud-frame::after {
    top: -1px;
    right: -1px;
    border-width: 2px 2px 0 0;
}

.hud-frame .ck::before {
    bottom: -1px;
    left: -1px;
    border-width: 0 0 2px 2px;
}

.hud-frame .ck::after {
    bottom: -1px;
    right: -1px;
    border-width: 0 2px 2px 0;
}

.hud-item {
    position: absolute;
    pointer-events: auto;
}

.hud-brand {
    top: 30px;
    left: 38px;
    font-family: var(--disp);
    font-weight: 700;
    font-size: 14px;
    letter-spacing: 0.3em;
}

.hud-brand .slash {
    color: var(--cyan);
}

.hud-index {
    top: 32px;
    right: 38px;
    font-family: var(--disp);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--dim);
    font-variant-numeric: tabular-nums;
}

.hud-index b {
    color: var(--cyan);
    font-weight: 500;
}

.hud-credit {
    bottom: 30px;
    left: 38px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--disp);
    font-size: 11px;
    letter-spacing: 0.24em;
    color: var(--dim);
}

.hud-credit a {
    color: var(--silver);
    transition: color 0.2s;
}

.hud-credit a:hover {
    color: var(--cyan);
}

.hud-credit .dot {
    width: 5px;
    height: 5px;
    background: var(--cyan);
}

.hud-progress {
    bottom: 30px;
    right: 38px;
    display: flex;
    align-items: center;
    gap: 14px;
    font-family: var(--disp);
    font-weight: 500;
    font-size: 13px;
    letter-spacing: 0.18em;
    color: var(--cyan);
    font-variant-numeric: tabular-nums;
}

.hud-progress .bar {
    width: 90px;
    height: 2px;
    background: var(--line);
    position: relative;
    overflow: hidden;
}

.hud-progress .bar i {
    position: absolute;
    inset: 0;
    background: var(--cyan);
    transform: scaleX(0);
    transform-origin: left;
}

.hud-hint {
    bottom: 88px;
    left: 50%;
    transform: translateX(-50%);
    font-family: var(--disp);
    font-size: 10px;
    letter-spacing: 0.34em;
    color: var(--faint);
    animation: hintPulse 2.6s ease-in-out infinite;
    transition: opacity 0.6s ease;
}

.hud-hint.hide {
    opacity: 0 !important;
    animation: none;
}

/* arrow nav - bottom center, split by the seam */
.hud-arrows {
    bottom: 26px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 1px;
}

.arrow-btn {
    width: 46px;
    height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--line);
    background: rgba(6, 10, 16, 0.78);
    backdrop-filter: blur(4px);
    transition: border-color 0.25s, background 0.25s, opacity 0.25s;
}

.arrow-btn .chev {
    width: 11px;
    height: 11px;
    border-left: 1.6px solid var(--cyan);
    border-bottom: 1.6px solid var(--cyan);
    transition: border-color 0.25s, transform 0.25s var(--ease-silk);
}

.arrow-btn.up .chev {
    transform: rotate(135deg) translate(-2px, 2px);
}

.arrow-btn.down .chev {
    transform: rotate(-45deg) translate(2px, -2px);
}

.arrow-btn:hover {
    border-color: var(--red);
    background: rgba(255, 0, 60, 0.06);
}

.arrow-btn:hover .chev {
    border-color: var(--red);
}

.arrow-btn.up:hover .chev {
    transform: rotate(135deg) translate(0, 0);
}

.arrow-btn.down:hover .chev {
    transform: rotate(-45deg) translate(0, 0);
}

.arrow-btn[disabled] {
    opacity: 0.25;
    pointer-events: none;
}

@keyframes hintPulse {

    0%,
    100% {
        opacity: 0.35;
    }

    50% {
        opacity: 1;
    }
}

/* ---------------------------------------------------------- */
/* REVEALS                                                     */
/* ---------------------------------------------------------- */

.reveal {
    opacity: 0;
    transform: translateY(26px);
    transition: opacity 0.9s var(--ease-silk), transform 0.9s var(--ease-silk);
}

.reveal.on {
    opacity: 1;
    transform: translateY(0);
}

/* ---------------------------------------------------------- */
/* REDUCED MOTION                                              */
/* ---------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
    .scanline {
        animation: none;
        top: 40%;
    }

    .hud-hint {
        animation: none;
        opacity: 0.6;
    }

    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .acc-body {
        transition: none;
    }

    .kinetic-value {
        transition: none;
    }

    .bp-img {
        transition: none;
    }

    .bp-marker {
        transition: none;
    }

    .bp-ring::after {
        animation: none;
        opacity: 0;
    }
}

/* ---------------------------------------------------------- */
/* MOBILE AND NARROW LAYOUT - native scroll fallback           */
/* ---------------------------------------------------------- */

@media (max-width: 900px) {

    html,
    body {
        overflow: visible;
        overflow-y: auto;
        overscroll-behavior: auto;
    }

    .panel {
        position: static;
        width: 100%;
        height: auto;
        min-height: 0;
        transform: none !important;
        will-change: auto;
    }

    .panel-inner {
        padding: 86px 26px;
    }

    .panel-media {
        height: 64vh;
        min-height: 380px;
    }

    .kinetic-panel {
        min-height: 60vh;
        padding: 70px 26px;
    }

    .seam {
        display: none;
    }

    .hud-frame,
    .hud-index,
    .hud-hint,
    .hud-arrows {
        display: none;
    }

    .hud-brand {
        top: 20px;
        left: 22px;
        mix-blend-mode: difference;
    }

    .hud-credit {
        bottom: auto;
        top: 20px;
        right: 22px;
        left: auto;
    }

    .hud-progress {
        display: none;
    }

    .c3d-stage {
        height: 340px;
    }

    .spec-cell {
        flex: 1 1 40%;
        margin-bottom: 18px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.9rem;
    }

    .kinetic-value {
        font-size: 2.6rem;
        -webkit-text-stroke-width: 1px;
    }

    .tab-btn {
        letter-spacing: 0.12em;
        font-size: 10.5px;
    }
}