:root {
    --bg: #090b10;
    --bg-2: #0d1017;
    --panel: #11151e;
    --panel-2: #151a24;
    --line: rgba(255, 255, 255, .09);
    --text: #f4f6f8;
    --muted: #9ca5b2;
    --accent: #ff4d18;
    --accent-2: #ff7a22;
    --white: #fff;
    --header-h: 78px;
    --radius: 22px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; background: var(--bg); }
body {
    min-width: 320px;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
}
body.lang-zh-hans { font-family: "Noto Sans SC", "DM Sans", system-ui, sans-serif; }
body.lang-zh-hant { font-family: "Noto Sans TC", "DM Sans", system-ui, sans-serif; }
body.lang-en { font-family: "DM Sans", "Noto Sans SC", system-ui, sans-serif; }
a { color: inherit; }
button, input, textarea { font: inherit; }
.container { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }
.container-wide { width: min(1420px, calc(100% - 48px)); margin: 0 auto; }

.site-header {
    position: fixed;
    z-index: 1000;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-h);
    border-bottom: 1px solid rgba(255,255,255,.07);
    background: rgba(9,11,16,.76);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    transition: background .25s ease, height .25s ease;
}
.site-header.scrolled { background: rgba(9,11,16,.94); }
.header-inner {
    width: min(1420px, calc(100% - 48px));
    height: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; flex: 0 0 auto; }
.brand-mark {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    overflow: hidden;
    border-radius: 13px;
    background: #fff;
    box-shadow: 0 10px 32px rgba(0,0,0,.24);
}
.brand-mark img { width: 100%; height: 100%; object-fit: contain; }
.brand-copy { display: flex; flex-direction: column; line-height: 1.15; }
.brand-copy strong { font-size: 16px; letter-spacing: .08em; }
.brand-copy small { margin-top: 5px; color: #7f8792; font-size: 9px; letter-spacing: .18em; }
.header-right { display: flex; align-items: center; gap: 24px; }
nav { display: flex; align-items: center; gap: 28px; }
nav a {
    position: relative;
    color: #c7ccd3;
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
    transition: color .2s ease;
}
nav a::after {
    content: "";
    position: absolute;
    left: 0;
    right: 100%;
    bottom: -8px;
    height: 2px;
    background: var(--accent);
    transition: right .22s ease;
}
nav a:hover { color: #fff; }
nav a:hover::after { right: 0; }
.lang-switcher { display: flex; gap: 3px; padding: 3px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.04); }
.lang-switcher button { min-width: 34px; padding: 5px 9px; border: 0; border-radius: 999px; background: transparent; color: #7f8792; font-size: 11px; font-weight: 700; cursor: pointer; }
.lang-switcher button.active { background: #fff; color: #090b10; }
.menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 12px; background: rgba(255,255,255,.04); }
.menu-toggle span { display: block; width: 17px; height: 1px; margin: 4px auto; background: #fff; }

.hero {
    min-height: 100svh;
    position: relative;
    display: grid;
    place-items: center;
    padding: calc(var(--header-h) + 70px) 0 80px;
    overflow: hidden;
    background:
        radial-gradient(circle at 78% 42%, rgba(255,77,24,.11), transparent 32%),
        linear-gradient(180deg, #0a0d13 0%, #090b10 100%);
}
.hero-grid {
    position: absolute;
    inset: 0;
    opacity: .22;
    background-image:
        linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
    background-size: 72px 72px;
    mask-image: linear-gradient(to bottom, transparent, #000 18%, #000 75%, transparent);
}
.hero-glow { position: absolute; border-radius: 50%; filter: blur(80px); pointer-events: none; }
.hero-glow-a { width: 420px; height: 420px; right: -120px; top: 15%; background: rgba(255,75,15,.13); }
.hero-glow-b { width: 320px; height: 320px; left: 15%; bottom: -180px; background: rgba(67,112,255,.09); }
.hero-inner {
    position: relative;
    z-index: 2;
    width: min(1420px, calc(100% - 48px));
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(0, .82fr) minmax(460px, 1.18fr);
    align-items: center;
    gap: 50px;
}
.hero-copy { max-width: 650px; }
.eyebrow, .section-kicker { color: var(--accent-2); font-size: 11px; font-weight: 800; letter-spacing: .22em; text-transform: uppercase; }
.eyebrow { display: flex; align-items: center; gap: 12px; margin-bottom: 24px; }
.eyebrow span { width: 40px; height: 1px; background: var(--accent); }
.hero h1 {
    max-width: 760px;
    font-size: clamp(50px, 6.2vw, 96px);
    line-height: .98;
    letter-spacing: -.055em;
    font-weight: 800;
}
.hero-desc { max-width: 600px; margin-top: 28px; color: #a7aeba; font-size: clamp(16px, 1.35vw, 20px); line-height: 1.8; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.btn {
    min-height: 52px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 0 24px;
    border: 1px solid transparent;
    border-radius: 999px;
    text-decoration: none;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
    transition: transform .2s ease, background .2s ease, border-color .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 16px 40px rgba(255,77,24,.24); }
.btn-primary:hover { background: #ff642f; }
.btn-ghost { border-color: rgba(255,255,255,.14); background: rgba(255,255,255,.04); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.24); }
.hero-meta { display: flex; flex-wrap: wrap; gap: 34px; margin-top: 52px; padding-top: 24px; border-top: 1px solid var(--line); }
.hero-meta div { display: flex; flex-direction: column; gap: 5px; }
.hero-meta strong { color: #fff; font-size: 11px; letter-spacing: .14em; }
.hero-meta span { color: #727b87; font-size: 12px; }
.hero-visual { position: relative; min-height: 520px; display: grid; place-items: center; }
.hero-car-silhouette { position: relative; width: min(100%, 700px); height: 260px; transform: perspective(900px) rotateY(-10deg) rotateX(3deg); }
.hero-car-line {
    position: absolute;
    left: 7%; right: 5%; top: 41%; height: 34%;
    border: 2px solid rgba(255,255,255,.13);
    border-top: 3px solid rgba(255,255,255,.5);
    border-radius: 56% 44% 18% 20% / 80% 74% 34% 32%;
    box-shadow: inset 0 0 60px rgba(255,255,255,.025), 0 30px 100px rgba(0,0,0,.38);
}
.hero-car-line::before {
    content: "";
    position: absolute;
    left: 24%; top: -59%; width: 42%; height: 68%;
    border-top: 2px solid rgba(255,255,255,.45);
    border-left: 1px solid rgba(255,255,255,.12);
    border-radius: 70% 35% 0 0;
    transform: skewX(-12deg);
}
.hero-car-line::after {
    content: "";
    position: absolute;
    left: 13%; right: 12%; bottom: 12%; height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    box-shadow: 0 0 26px rgba(255,77,24,.8);
}
.hero-wheel { position: absolute; top: 58%; width: 105px; height: 105px; border: 13px solid #0b0d11; border-radius: 50%; box-shadow: inset 0 0 0 2px #2d333c, 0 0 0 1px rgba(255,255,255,.1), 0 20px 50px rgba(0,0,0,.6); }
.hero-wheel::after { content: ""; position: absolute; inset: 22px; border: 1px solid #505866; border-radius: 50%; }
.hero-wheel-left { left: 17%; }
.hero-wheel-right { right: 13%; }
.hero-visual-label { position: absolute; right: 0; bottom: 4%; color: #4f5661; font: 700 10px/1 "DM Sans",sans-serif; letter-spacing: .22em; }
.scroll-hint { position: absolute; z-index: 2; left: 50%; bottom: 24px; transform: translateX(-50%); display: flex; align-items: center; gap: 10px; color: #5f6670; font-size: 10px; letter-spacing: .16em; }
.scroll-hint span { width: 34px; height: 1px; background: #5f6670; }

.showcase-section { position: relative; padding: 120px 0 100px; background: #f1f2f4; color: #15181e; }
.showcase-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 60px; margin-bottom: 44px; }
.showcase-head h2 { max-width: 760px; margin-top: 10px; font-size: clamp(38px, 5vw, 72px); line-height: 1.05; letter-spacing: -.045em; }
.showcase-head p { max-width: 430px; color: #6b727d; font-size: 14px; }
.viewer-shell { border-radius: 28px; overflow: hidden; background: #0b0e14; box-shadow: 0 32px 90px rgba(18,24,35,.16); }
.viewer-topbar, .viewer-bottom { min-height: 58px; display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 0 24px; color: #818a97; border-bottom: 1px solid rgba(255,255,255,.075); background: #0c0f15; }
.viewer-live { display: flex; align-items: center; gap: 9px; font-size: 10px; font-weight: 800; letter-spacing: .16em; }
.viewer-live i { width: 7px; height: 7px; border-radius: 50%; background: #44e282; box-shadow: 0 0 13px rgba(68,226,130,.85); }
.viewer-file { display: flex; align-items: center; gap: 10px; font-size: 9px; letter-spacing: .16em; }
.viewer-file code { color: #dfe4ea; font: 500 11px/1.4 ui-monospace,SFMono-Regular,Menlo,monospace; letter-spacing: 0; }
.viewer-stage { position: relative; height: min(70vw, 720px); min-height: 500px; overflow: hidden; isolation: isolate; cursor: grab; touch-action: none; }
.viewer-stage:active { cursor: grabbing; }
.viewer-stage::before { content: ""; position: absolute; inset: 0; z-index: -5; background: radial-gradient(circle at 50% 38%, #242b37 0%, #11151d 36%, #080a0f 76%); }
.viewer-backdrop { position: absolute; z-index: -4; inset: 0; background: linear-gradient(180deg, transparent 0 57%, rgba(255,255,255,.018) 57% 100%); }
.viewer-ring { position: absolute; z-index: -2; left: 50%; top: 49%; border: 1px solid rgba(255,255,255,.06); border-radius: 50%; transform: translate(-50%,-50%) rotateX(68deg); pointer-events: none; }
.ring-a { width: 72%; aspect-ratio: 1; }
.ring-b { width: 48%; aspect-ratio: 1; border-color: rgba(255,77,24,.16); }
.viewer-floor { position: absolute; z-index: -3; left: 10%; right: 10%; bottom: 5%; height: 38%; background: radial-gradient(ellipse at center, rgba(0,0,0,.56), transparent 67%); transform: perspective(500px) rotateX(62deg); filter: blur(4px); }
#carCanvas { position: absolute; z-index: 1; inset: 0; width: 100%; height: 100%; display: block; outline: none; }
.viewer-status, .viewer-empty { position: absolute; z-index: 6; left: 50%; top: 50%; transform: translate(-50%,-50%); display: flex; flex-direction: column; align-items: center; text-align: center; pointer-events: none; }
.viewer-status strong, .viewer-empty strong { margin-top: 16px; color: #fff; font-size: 14px; }
.viewer-status span { margin-top: 6px; color: #69727f; font-size: 11px; }
.loader-ring { width: 38px; height: 38px; border-radius: 50%; border: 2px solid rgba(255,255,255,.1); border-top-color: var(--accent); animation: spin .9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.viewer-empty { width: min(430px, 80%); }
.viewer-empty[hidden] { display: none; }
.empty-icon { width: 64px; height: 64px; display: grid; place-items: center; border: 1px solid rgba(255,255,255,.1); border-radius: 18px; background: rgba(255,255,255,.04); color: #727b87; font-size: 24px; }
.viewer-empty p { max-width: 360px; margin-top: 8px; color: #76808d; font-size: 12px; }
.viewer-empty code { margin-top: 16px; padding: 7px 12px; border: 1px solid rgba(255,255,255,.08); border-radius: 999px; color: #ff815c; background: rgba(255,77,24,.07); font-size: 11px; }
.viewer-help { position: absolute; z-index: 7; left: 22px; bottom: 20px; display: flex; flex-wrap: wrap; gap: 8px; pointer-events: none; }
.viewer-help span { display: flex; align-items: center; gap: 7px; min-height: 30px; padding: 0 11px; border: 1px solid rgba(255,255,255,.08); border-radius: 999px; background: rgba(6,8,12,.54); backdrop-filter: blur(10px); color: #8f98a5; font-size: 10px; }
.viewer-help b { font-weight: 600; }
.viewer-bottom { min-height: 76px; justify-content: flex-start; border-top: 1px solid rgba(255,255,255,.075); border-bottom: 0; }
.spec-item { display: flex; align-items: center; gap: 8px; padding-right: 22px; border-right: 1px solid rgba(255,255,255,.08); }
.spec-item span { color: var(--accent); font-size: 9px; }
.spec-item strong { color: #b8c0cb; font-size: 11px; font-weight: 600; }
.viewer-note { margin-left: auto; color: #5f6875; font-size: 10px; }

.tech-section { padding: 120px 0; background: #0b0e14; }
.section-title { max-width: 800px; margin-bottom: 52px; }
.section-title h2 { margin-top: 12px; font-size: clamp(38px, 4.4vw, 62px); line-height: 1.08; letter-spacing: -.04em; }
.section-title p { max-width: 590px; margin-top: 18px; color: #858e9a; }
.tech-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.tech-card { min-height: 280px; position: relative; padding: 30px; border: 1px solid rgba(255,255,255,.075); border-radius: 20px; background: linear-gradient(145deg, #11151d, #0d1016); overflow: hidden; }
.tech-card::before { content: ""; position: absolute; inset: auto -60px -100px auto; width: 220px; height: 220px; border: 1px solid rgba(255,255,255,.055); border-radius: 50%; }
.tech-card-large { grid-column: span 2; }
.tech-card-accent { background: linear-gradient(145deg, #e84918, #b82d0d); border-color: transparent; }
.tech-index { position: absolute; right: 24px; top: 22px; color: #535b67; font-size: 10px; }
.tech-card-accent .tech-index { color: rgba(255,255,255,.46); }
.tech-card > i { margin-top: 42px; color: var(--accent); font-size: 25px; }
.tech-card-accent > i { color: #fff; }
.tech-card h3 { margin-top: 22px; font-size: 19px; }
.tech-card p { max-width: 430px; margin-top: 9px; color: #808995; font-size: 13px; }
.tech-card-accent p { color: rgba(255,255,255,.72); }

.download-section { padding: 105px 0; color: #17191d; background: #f1f2f4; }
.download-layout { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 80px; }
.download-copy h2 { max-width: 560px; margin-top: 12px; font-size: clamp(38px, 4.2vw, 58px); line-height: 1.08; letter-spacing: -.045em; }
.download-copy > p { max-width: 520px; margin-top: 18px; color: #676f7b; }
.download-status { margin-top: 24px; color: #7e8793; font-size: 11px; }
.download-status[data-state="ready"] { color: #178554; }
.download-status[data-state="fallback"] { color: #a96a0e; }
.download-cards { display: grid; gap: 12px; }
.store-card { min-height: 92px; display: flex; align-items: center; gap: 17px; padding: 0 24px; border-radius: 18px; color: #fff; background: #0b0d11; text-decoration: none; box-shadow: 0 16px 50px rgba(14,18,26,.12); transition: transform .2s ease; }
.store-card:hover { transform: translateY(-3px); }
.store-card > i:first-child { width: 34px; text-align: center; font-size: 31px; }
.store-card span { display: flex; flex-direction: column; line-height: 1.2; }
.store-card small { color: #7f8790; font-size: 9px; letter-spacing: .08em; }
.store-card strong { margin-top: 4px; font-size: 20px; }
.store-arrow { margin-left: auto; color: #555d68; font-size: 13px; }

.about-section { padding: 120px 0; background: #0b0e14; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; align-items: start; gap: 80px; }
.about-copy h2 { margin-top: 12px; font-size: clamp(38px, 4.2vw, 58px); line-height: 1.08; letter-spacing: -.045em; }
.about-copy p { max-width: 590px; margin-top: 20px; color: #858e9a; font-size: 14px; }
.text-link { display: inline-flex; align-items: center; gap: 12px; margin-top: 30px; color: #fff; text-decoration: none; font-size: 13px; font-weight: 700; }
.text-link i { color: var(--accent); transition: transform .2s ease; }
.text-link:hover i { transform: translateX(4px); }
.company-card { padding: 28px; border: 1px solid rgba(255,255,255,.08); border-radius: 22px; background: #11151d; }
.company-card-top { display: flex; align-items: center; justify-content: space-between; padding-bottom: 22px; border-bottom: 1px solid rgba(255,255,255,.08); color: #6f7884; font-size: 9px; letter-spacing: .16em; }
.company-card-top b { display: grid; place-items: center; width: 32px; height: 32px; border: 1px solid rgba(255,255,255,.09); border-radius: 50%; color: #fff; font-size: 10px; }
.company-card dl div { display: grid; grid-template-columns: 120px 1fr; gap: 20px; padding: 19px 0; border-bottom: 1px solid rgba(255,255,255,.065); }
.company-card dl div:last-child { border-bottom: 0; padding-bottom: 0; }
.company-card dt { color: #68717d; font-size: 11px; }
.company-card dd { color: #cfd5dc; font-size: 12px; line-height: 1.7; }

.contact-section { padding: 110px 0; color: #17191d; background: #e8eaed; }
.contact-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 80px; align-items: start; }
.contact-copy h2 { max-width: 560px; margin-top: 12px; font-size: clamp(38px, 4.3vw, 60px); line-height: 1.08; letter-spacing: -.045em; }
.contact-copy p { max-width: 500px; margin-top: 18px; color: #68717c; }
.contact-domain { display: flex; flex-direction: column; gap: 5px; margin-top: 38px; }
.contact-domain span { color: #8d949d; font-size: 10px; letter-spacing: .12em; }
.contact-domain strong { font-size: 14px; }
.contact-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 28px; border: 1px solid rgba(20,26,35,.08); border-radius: 22px; background: rgba(255,255,255,.68); box-shadow: 0 20px 70px rgba(18,23,31,.08); }
.contact-form label { display: flex; flex-direction: column; gap: 8px; color: #666e79; font-size: 11px; font-weight: 600; }
.contact-form .full { grid-column: 1 / -1; }
.contact-form input, .contact-form textarea { width: 100%; border: 1px solid #d5d8dd; border-radius: 11px; outline: none; background: #fff; color: #16191e; transition: border-color .2s ease, box-shadow .2s ease; }
.contact-form input { height: 48px; padding: 0 14px; }
.contact-form textarea { min-height: 130px; padding: 12px 14px; resize: vertical; }
.contact-form input:focus, .contact-form textarea:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(255,77,24,.08); }
.contact-form .btn { border: 0; }

.privacy-section { padding: 0 0 70px; color: #17191d; background: #e8eaed; }
.privacy-wrap details { border-top: 1px solid #ccd0d6; border-bottom: 1px solid #ccd0d6; }
.privacy-wrap summary { min-height: 66px; display: flex; align-items: center; justify-content: space-between; cursor: pointer; list-style: none; font-size: 12px; font-weight: 700; }
.privacy-wrap summary::-webkit-details-marker { display: none; }
.privacy-wrap summary i { color: #858d97; transition: transform .2s ease; }
.privacy-wrap details[open] summary i { transform: rotate(180deg); }
.privacy-content { max-width: 850px; padding: 0 0 28px; color: #6d7580; font-size: 12px; }
.privacy-content p + p { margin-top: 12px; }
.privacy-date { color: #969ca4; }

footer { padding: 48px 0 28px; background: #080a0e; }
.footer-main { display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand .brand-mark { width: 38px; height: 38px; border-radius: 11px; }
.footer-brand div { display: flex; flex-direction: column; line-height: 1.2; }
.footer-brand strong { font-size: 13px; }
.footer-brand small { margin-top: 5px; color: #565e69; font-size: 8px; letter-spacing: .1em; }
.footer-links { display: flex; flex-wrap: wrap; gap: 24px; }
.footer-links a { color: #737b86; text-decoration: none; font-size: 11px; }
.footer-links a:hover { color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; margin-top: 34px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.065); color: #464d57; font-size: 9px; letter-spacing: .06em; }

@media (max-width: 1100px) {
    .header-right { gap: 14px; }
    nav { gap: 17px; }
    .hero-inner { grid-template-columns: 1fr .9fr; }
    .hero-visual { min-height: 400px; }
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-card-large { grid-column: span 2; }
}

@media (max-width: 860px) {
    :root { --header-h: 68px; }
    .container, .container-wide, .header-inner, .hero-inner { width: min(100% - 32px, 720px); }
    .menu-toggle { display: block; margin-left: auto; }
    .header-right {
        position: absolute;
        top: calc(100% + 1px);
        left: 0;
        right: 0;
        display: none;
        align-items: stretch;
        flex-direction: column;
        padding: 20px 16px 24px;
        background: rgba(9,11,16,.98);
        border-bottom: 1px solid var(--line);
    }
    .site-header.menu-open .header-right { display: flex; }
    nav { flex-direction: column; align-items: stretch; gap: 0; }
    nav a { padding: 12px 4px; border-bottom: 1px solid rgba(255,255,255,.05); }
    nav a::after { display: none; }
    .lang-switcher { align-self: flex-start; }
    .hero { padding-top: calc(var(--header-h) + 56px); }
    .hero-inner { grid-template-columns: 1fr; }
    .hero-copy { max-width: none; }
    .hero h1 { font-size: clamp(48px, 12vw, 76px); }
    .hero-visual { display: none; }
    .hero-meta { gap: 20px 28px; }
    .showcase-section, .tech-section, .about-section { padding: 86px 0; }
    .showcase-head { display: block; }
    .showcase-head p { margin-top: 20px; }
    .viewer-stage { height: 72svh; min-height: 480px; max-height: 680px; }
    .viewer-bottom { flex-wrap: wrap; padding: 14px 18px; }
    .viewer-note { width: 100%; margin-left: 0; }
    .download-section, .contact-section { padding: 80px 0; }
    .download-layout, .about-grid, .contact-layout { grid-template-columns: 1fr; gap: 48px; }
}

@media (max-width: 600px) {
    .brand-copy small { display: none; }
    .hero { min-height: 92svh; }
    .hero h1 { font-size: 13vw; }
    .hero-desc { margin-top: 22px; font-size: 15px; }
    .hero-actions { flex-direction: column; align-items: stretch; }
    .btn { width: 100%; }
    .hero-meta { margin-top: 36px; }
    .scroll-hint { display: none; }
    .showcase-head h2, .section-title h2, .download-copy h2, .about-copy h2, .contact-copy h2 { font-size: 36px; }
    .viewer-shell { margin-left: -6px; margin-right: -6px; border-radius: 20px; }
    .viewer-topbar { padding: 0 14px; }
    .viewer-file span { display: none; }
    .viewer-stage { height: 62svh; min-height: 420px; }
    .viewer-help { left: 12px; right: 12px; bottom: 12px; }
    .viewer-help span { padding: 0 9px; }
    .viewer-bottom { min-height: 0; }
    .spec-item { width: calc(50% - 8px); padding-right: 0; border: 0; }
    .spec-item:nth-child(3) { width: 100%; }
    .tech-grid { grid-template-columns: 1fr; }
    .tech-card-large { grid-column: auto; }
    .company-card { padding: 20px; }
    .company-card dl div { grid-template-columns: 1fr; gap: 5px; }
    .contact-form { grid-template-columns: 1fr; padding: 20px; }
    .contact-form .full { grid-column: auto; }
    .footer-main, .footer-bottom { flex-direction: column; align-items: flex-start; }
    .footer-links { gap: 14px 20px; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

/* Hero embedded Three.js model */
.hero-visual {
    position: relative;
    min-height: 560px;
    display: grid;
    place-items: center;
    min-width: 0;
}
.hero-model-stage {
    position: relative;
    width: 100%;
    height: clamp(480px, 47vw, 690px);
    overflow: hidden;
    cursor: grab;
    touch-action: none;
    isolation: isolate;
}
.hero-model-stage:active { cursor: grabbing; }
.hero-model-stage::before {
    content: "";
    position: absolute;
    z-index: -3;
    left: 50%;
    top: 48%;
    width: 82%;
    aspect-ratio: 1;
    transform: translate(-50%, -50%);
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,77,24,.10) 0%, rgba(255,77,24,.035) 33%, transparent 70%);
    filter: blur(8px);
    pointer-events: none;
}
.hero-model-floor {
    position: absolute;
    z-index: -2;
    left: 5%;
    right: 5%;
    bottom: 6%;
    height: 32%;
    background: radial-gradient(ellipse at center, rgba(0,0,0,.58), transparent 68%);
    transform: perspective(520px) rotateX(64deg);
    filter: blur(5px);
    pointer-events: none;
}
.hero-model-stage #carCanvas {
    position: absolute;
    z-index: 1;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
    outline: none;
}
.hero-model-stage .viewer-status,
.hero-model-stage .viewer-empty {
    z-index: 5;
}
.hero-model-stage .viewer-status strong,
.hero-model-stage .viewer-empty strong,
.hero-model-stage .viewer-empty p {
    display: none;
}
.hero-model-stage .viewer-status span {
    margin-top: 10px;
}
.hero-model-stage .viewer-empty code {
    margin-top: 12px;
}

@media (max-width: 1100px) {
    .hero-visual { min-height: 450px; }
    .hero-model-stage { height: clamp(420px, 50vw, 560px); }
}

@media (max-width: 860px) {
    .hero-visual {
        display: grid;
        min-height: 390px;
        margin-top: 12px;
    }
    .hero-model-stage {
        height: clamp(360px, 72vw, 500px);
    }
}

@media (max-width: 600px) {
    .hero-visual { min-height: 330px; }
    .hero-model-stage {
        height: 340px;
        margin-inline: -8px;
        width: calc(100% + 16px);
    }
}