/* design-systems/hud/tokens.css
     * Structured token bindings for HUD.
     * HUD interface language with dark transparent panels, cyan telemetry, and compact status readouts.
     */

    :root {
      --bg: #090b12;
      --surface: #121722;
      --surface-warm: #1b2233;
      --fg: #f8fafc;
      --fg-2: #cbd5e1;
      --muted: #94a3b8;
      --meta: #60a5fa;
      --border: #2a3447;
      --border-soft: #1d2636;
      --accent: #00ff41;
      --accent-on: #06101d;
      --accent-hover: color-mix(in oklab, var(--accent), black 8%);
      --accent-active: color-mix(in oklab, var(--accent), black 14%);
      --success: #00ff41;
      --warn: #fbbf24;
      --danger: #fb7185;
      --font-display: "IBM Plex Mono", ui-monospace, monospace;
      --font-body: "IBM Plex Mono", ui-monospace, monospace;
      --font-mono: "IBM Plex Mono", ui-monospace, monospace;
      --text-xs: 11px;
      --text-sm: 12px;
      --text-base: 14px;
      --text-lg: 16px;
      --text-xl: 20px;
      --text-2xl: 28px;
      --text-3xl: 40px;
      --text-4xl: 56px;
      --leading-body: 1.45;
      --leading-tight: 1.06;
      --tracking-display: -0.025em;
      --space-1: 4px;
      --space-2: 8px;
      --space-3: 12px;
      --space-4: 16px;
      --space-5: 20px;
      --space-6: 24px;
      --space-8: 32px;
      --space-12: 48px;
      --section-y-desktop: 80px;
      --section-y-tablet: 60px;
      --section-y-phone: 42px;
      --radius-sm: 10px;
      --radius-md: 16px;
      --radius-lg: 24px;
      --radius-pill: 9999px;
      --elev-flat: none;
      --elev-ring: 0 0 0 1px var(--border);
      --elev-raised: 0 24px 72px rgba(0, 0, 0, 0.42);
      --focus-ring: 0 0 0 4px rgba(0, 255, 65, 0.28);
      --motion-fast: 100ms;
      --motion-base: 180ms;
      --ease-standard: cubic-bezier(0.2, 0, 0, 1);
      --container-max: 1280px;
      --container-gutter-desktop: 36px;
      --container-gutter-tablet: 24px;
      --container-gutter-phone: 16px;
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body { margin: 0; min-width: 320px; background: var(--bg); color: var(--fg); font-family: var(--font-body); font-size: var(--text-base); line-height: var(--leading-body); overflow-x: hidden; }
    body::before { content: ""; position: fixed; inset: 0; z-index: -2; pointer-events: none; background-image: linear-gradient(to right, color-mix(in oklab, var(--border), transparent 48%) 1px, transparent 1px), linear-gradient(to bottom, color-mix(in oklab, var(--border), transparent 48%) 1px, transparent 1px); background-size: 48px 48px; opacity: 0.36; }
    body::after { content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none; background: repeating-linear-gradient(to bottom, color-mix(in oklab, var(--fg), transparent 97%) 0, color-mix(in oklab, var(--fg), transparent 97%) 1px, transparent 1px, transparent 7px); opacity: .25; }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    button { cursor: pointer; }
    img { display: block; max-width: 100%; }
    .container { width: min(100% - var(--container-gutter-desktop) * 2, var(--container-max)); margin: 0 auto; }
    .topbar { position: sticky; top: 0; z-index: 40; border-bottom: 1px solid var(--border); background: color-mix(in oklab, var(--bg), transparent 8%); backdrop-filter: blur(16px); }
    .nav { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-5); }
    .brand { display: flex; align-items: center; gap: var(--space-3); min-width: 0; }
    .brand-logo { height: 36px; width: auto; object-fit: contain; }
    .nav-links, .nav-actions, .hero-actions, .footer-row, .inline-actions, .download-row { display: flex; align-items: center; gap: var(--space-3); }
    .nav-links { gap: var(--space-5); color: var(--fg-2); font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.08em; }
    .nav-links a { padding-block: var(--space-2); border-bottom: 1px solid transparent; }
    .nav-links a:hover, .nav-links a:focus-visible { border-color: var(--accent); outline: none; }
    .btn, .lang-trigger, .lang-option { min-height: 42px; border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 0 var(--space-4); display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2); background: var(--surface); color: var(--fg); transition: transform var(--motion-base) var(--ease-standard), border-color var(--motion-fast) var(--ease-standard), background var(--motion-fast) var(--ease-standard); }
    .btn:hover, .btn:focus-visible, .lang-trigger:hover, .lang-trigger:focus-visible, .lang-option:hover, .lang-option:focus-visible { border-color: var(--accent); outline: none; transform: translateY(-1px); }
    .btn-primary, .lang-option.active { border-color: var(--accent); background: var(--accent); color: var(--accent-on); font-weight: 700; }
    .btn-primary:hover, .btn-primary:focus-visible { background: var(--accent-hover); }
    .language-menu { position: relative; }
    .lang-trigger { min-height: 34px; padding-inline: var(--space-3); font-size: var(--text-xs); text-transform: uppercase; }
    .lang-trigger::after { content: "▾"; color: var(--meta); font-size: var(--text-xs); }
    .mobile-menu-btn { display: none; min-height: 42px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); color: var(--fg); padding: 0 var(--space-3); align-items: center; justify-content: center; cursor: pointer; transition: border-color var(--motion-fast) var(--ease-standard); }
    .mobile-menu-btn:hover, .mobile-menu-btn:focus-visible { border-color: var(--accent); outline: none; }
    .mobile-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: color-mix(in oklab, var(--bg), transparent 8%); backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); padding: var(--space-4) var(--container-gutter-phone); flex-direction: column; gap: var(--space-2); }
    .mobile-nav.open { display: flex; }
    .mobile-nav a { padding: var(--space-3) var(--space-4); border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--fg-2); font-size: var(--text-xs); text-transform: uppercase; letter-spacing: 0.08em; transition: border-color var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard); }
    .mobile-nav a:hover, .mobile-nav a:focus-visible { border-color: var(--accent); color: var(--fg); outline: none; }
    .lang-popover { position: absolute; top: calc(100% + var(--space-2)); right: 0; min-width: 156px; display: none; gap: var(--space-2); padding: var(--space-2); border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); box-shadow: var(--elev-raised); z-index: 80; }
    .language-menu.open .lang-popover { display: grid; animation: menu-in var(--motion-base) var(--ease-standard) both; }
    .lang-option { width: 100%; min-height: 36px; justify-content: flex-start; padding-inline: var(--space-3); font-size: var(--text-xs); text-transform: uppercase; }
    section { padding-block: var(--section-y-desktop); }
    h1, h2, h3, p { margin: 0; }
    h1, h2, h3 { font-family: var(--font-display); line-height: var(--leading-tight); letter-spacing: var(--tracking-display); text-wrap: balance; }
    h1 { max-width: 980px; margin-top: var(--space-4); font-size: clamp(38px, 5.2vw, var(--text-4xl)); }
    h2 { max-width: 860px; font-size: clamp(28px, 3.6vw, var(--text-3xl)); }
    h3 { font-size: var(--text-xl); }
    p { text-wrap: pretty; }
    .lead, .section-head p, .card p, .product-copy, .contact-card p, .timeline p, .quote-note { color: var(--fg-2); text-transform: none; }
    .lead { max-width: 780px; margin-top: var(--space-5); font-size: var(--text-lg); }
    .eyebrow, .kicker, .metric-label, .field-label { color: var(--meta); font-size: var(--text-xs); font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; }
    .eyebrow { width: fit-content; border: 1px solid var(--border); border-radius: var(--radius-pill); padding: var(--space-2) var(--space-3); background: var(--surface); }
    .hud-hero { position: relative; width: 100vw; min-height: min(760px, calc(100dvh - 72px)); margin-left: calc(-50vw + 50%); overflow: hidden; padding-block: 0; }
    .hud-hero .hero-carousel { position: absolute; inset: 0; }
    .hud-hero .hero-carousel-slide { position: absolute; inset: 0; opacity: 0; transition: opacity 1.2s ease; }
    .hud-hero .hero-carousel-slide.active { opacity: 1; }
    .hud-hero .hero-carousel-slide img { width: 100%; height: 100%; object-fit: cover; }
    .hud-hero .hero-carousel-dots { position: absolute; bottom: 20px; left: 50%; transform: translateX(-50%); display: flex; gap: 8px; z-index: 5; }
    .hero-actions { margin-top: var(--space-6); flex-wrap: wrap; }
    .hero-metrics { margin-top: var(--space-8); display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--space-3); }
    .metric, .card, .panel, .contact-card, .timeline, .download-card, .scenario-card, .category-card { border: 1px solid var(--border); background: var(--surface); }
    .metric { min-height: 112px; padding: var(--space-4); clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%); }
    .metric-value { display: block; margin-top: var(--space-4); color: var(--success); font-size: var(--text-2xl); font-weight: 700; line-height: 1; }
    .product-media img { width: 100%; height: 100%; object-fit: cover; opacity: .72; filter: saturate(.72) contrast(1.12); }
    .product-media img.core-product-image { object-fit: contain; opacity: 1; filter: none; background: var(--surface-warm); }
    /* 轮播 */
    .hero-carousel { position: absolute; inset: 0; }
    .hero-thermal-canvas { position: absolute; inset: 0; z-index: 1; width: 100%; height: 100%; pointer-events: none; opacity: .78; mix-blend-mode: screen; }
    .hud-hero.webgl-unavailable .hero-carousel::after { content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none; opacity: .17; background: repeating-linear-gradient(0deg, transparent 0 7px, rgba(34, 255, 170, .12) 8px, transparent 9px), radial-gradient(ellipse at 66% 48%, rgba(255, 82, 18, .16), transparent 45%); mix-blend-mode: screen; }
    .hero-carousel-slide { position: absolute; inset: 0; opacity: 0; transition: opacity 1.2s ease; }
    .hero-carousel-slide.active { opacity: 1; }
    .hero-carousel-slide img { width: 100%; height: 100%; object-fit: cover; opacity: 1; filter: saturate(.92) contrast(1.04); }
    .hero-carousel-dots { position: absolute; bottom: 16px; left: 50%; transform: translateX(-50%); display: flex; gap: 8px; z-index: 5; }
    .hero-carousel-dot { width: 8px; height: 8px; border-radius: 50%; border: 1px solid var(--accent); background: transparent; cursor: pointer; transition: all .3s; padding: 0; }
    .hero-carousel-dot.active { background: var(--accent); transform: scale(1.3); }
    .hero-carousel-dot:hover { background: var(--accent); opacity: .7; }
    /* 产品留在右侧，所有可翻译文案作为真实 DOM 叠在左侧留白区。 */
    .hud-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(5,9,15,.90) 0%, rgba(5,9,15,.66) 40%, rgba(5,9,15,.08) 68%, rgba(5,9,15,.16) 100%), linear-gradient(180deg, rgba(5,7,12,.30) 0%, transparent 52%, rgba(5,7,12,.44) 100%); z-index: 2; pointer-events: none; }
    .hero-overlay { position: absolute; inset: 0; z-index: 3; display: flex; flex-direction: column; align-items: flex-start; justify-content: center; text-align: left; padding: var(--space-8) max(var(--space-6), calc((100vw - var(--container-max)) / 2)); gap: var(--space-4); }
    .hero-overlay .hero-text-fade, .hero-overlay .hero-cta { width: min(620px, calc(100vw - 48px)); }
    .hero-overlay .hero-kicker { font-size: var(--text-xs); letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); font-weight: 700; }
    .hero-overlay .hero-title { margin: var(--space-3) 0 0; max-width: 620px; color: var(--fg); font-size: 52px; font-weight: 800; line-height: 1.06; text-wrap: balance; text-shadow: 0 2px 20px rgba(0,0,0,.5); }
    .hero-overlay .hero-subtitle { margin: var(--space-4) 0 0; max-width: 580px; color: var(--fg-2); font-size: 18px; line-height: 1.55; text-shadow: 0 1px 12px rgba(0,0,0,.6); }
    .hero-facts { display: flex; flex-wrap: wrap; gap: var(--space-3) var(--space-5); margin-top: var(--space-5); color: var(--fg); font-size: var(--text-xs); font-weight: 700; }
    .hero-facts span { min-height: 28px; display: inline-flex; align-items: center; padding-left: var(--space-3); border-left: 2px solid var(--accent); }
    .hero-overlay .hero-cta { margin-top: var(--space-2); }
    .hero-overlay .hero-cta .btn { min-height: 48px; padding: 0 var(--space-6); font-size: var(--text-base); font-weight: 700; }
    /* 文字随轮播切换淡入 */
    .hero-overlay .hero-text-fade { transition: opacity 0.6s var(--ease-standard), transform 0.6s var(--ease-standard); }
    .hero-overlay .hero-text-fade.changing { opacity: 0; transform: translateY(8px); }
    @media (max-width: 820px) {
      .hero-overlay { justify-content: flex-end; padding: var(--space-8) var(--container-gutter-tablet) 72px; gap: var(--space-3); }
      .hero-overlay .hero-title { max-width: 560px; font-size: 40px; }
      .hero-overlay .hero-subtitle { max-width: 520px; font-size: 16px; }
      .hud-hero::after { background: linear-gradient(180deg, rgba(5,9,15,.08) 0%, rgba(5,9,15,.36) 42%, rgba(5,9,15,.94) 100%); }
      .hud-hero .hero-carousel-slide img { object-position: var(--hero-mobile-focus, 68% center) !important; }
    }
    @media (max-width: 520px) {
      .hero-overlay { padding: var(--space-6) var(--container-gutter-phone) 64px; }
      .hero-overlay .hero-title { font-size: 32px; line-height: 1.1; }
      .hero-overlay .hero-subtitle { font-size: 15px; }
      .hero-facts { gap: var(--space-2) var(--space-3); margin-top: var(--space-4); }
      .hero-facts span { min-height: 24px; }
      .hero-overlay .hero-cta .btn { min-height: 44px; padding: 0 var(--space-4); }
    }
    @media (min-width: 821px) and (max-height: 600px) {
      .hero-overlay { padding-block: var(--space-4); gap: var(--space-2); }
      .hero-overlay .hero-title { margin-top: var(--space-2); font-size: 40px; }
      .hero-overlay .hero-subtitle { margin-top: var(--space-3); font-size: 15px; line-height: 1.4; }
      .hero-facts { margin-top: var(--space-3); gap: var(--space-2) var(--space-4); }
      .hero-overlay .hero-cta { margin-top: 0; }
      .hero-overlay .hero-cta .btn { min-height: 44px; }
    }
    .reticle { position: absolute; inset: 11%; border: 1px solid color-mix(in oklab, var(--success), transparent 18%); pointer-events: none; }
    .reticle::before, .reticle::after { content: ""; position: absolute; background: color-mix(in oklab, var(--success), transparent 18%); }
    .reticle::before { width: 1px; height: 100%; left: 50%; top: 0; }
    .reticle::after { height: 1px; width: 100%; left: 0; top: 50%; }
    .reticle-core { position: absolute; width: 116px; height: 116px; left: 50%; top: 50%; transform: translate(-50%, -50%); border: 2px solid var(--success); border-radius: 50%; }
    .telemetry { position: absolute; display: grid; gap: var(--space-2); border: 1px solid var(--border); background: color-mix(in oklab, var(--bg), transparent 14%); padding: var(--space-3); color: var(--success); text-transform: uppercase; }
    .telemetry strong { font-size: var(--text-xl); line-height: 1; }
    .telemetry span { color: var(--muted); font-size: var(--text-xs); }
    .telemetry-a { top: var(--space-5); left: var(--space-5); }
    .telemetry-b { right: var(--space-5); bottom: var(--space-5); }
    .section-head { display: grid; grid-template-columns: minmax(0, .84fr) minmax(280px, .48fr); align-items: end; gap: var(--space-8); margin-bottom: var(--space-6); }
    .route-grid, .category-grid, .scenario-grid, .quality-grid, .download-grid, .contact-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--border); }
    .category-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .scenario-grid, .quality-grid, .download-grid, .contact-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .card, .category-card, .scenario-card, .download-card, .contact-card { min-height: 214px; padding: var(--space-5); display: grid; align-content: space-between; gap: var(--space-6); background: var(--surface); border: 0; }
    .category-card { min-height: 260px; }
    .category-card:hover, .scenario-card:hover, .download-card:hover { outline: 1px solid var(--accent); outline-offset: -1px; }
    .category-code { color: var(--success); font-size: var(--text-2xl); font-weight: 700; line-height: 1; }
    .category-meta { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-4); }
    .chip, .status-chip { min-height: 28px; display: inline-flex; align-items: center; border: 1px solid var(--border); border-radius: var(--radius-pill); padding: 0 var(--space-3); color: var(--fg-2); font-size: var(--text-xs); text-transform: uppercase; white-space: nowrap; }
    .status-chip.ready { border-color: color-mix(in oklab, var(--success), transparent 30%); color: var(--success); }
    .status-chip.gated { border-color: var(--border); color: var(--muted); }
    .catalog-brief { display: grid; grid-template-columns: minmax(0, .78fr) minmax(360px, .5fr); gap: var(--space-5); align-items: stretch; }
    .product-preview { display: grid; gap: 1px; background: var(--border); }
    .product-row { display: grid; grid-template-columns: 120px 1fr auto; gap: var(--space-4); align-items: center; padding: var(--space-4); background: var(--surface); }
    .product-name-link { color: inherit; text-decoration: none; transition: color var(--motion-fast) var(--ease-standard); }
    .product-name-link:hover, .product-name-link:focus-visible { color: var(--accent); outline: none; }
    .product-media { height: 92px; overflow: hidden; background: var(--bg); }
    .timeline { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; background: var(--border); }
    .timeline-step { min-height: 250px; padding: var(--space-5); background: var(--surface); display: grid; align-content: space-between; gap: var(--space-5); }
    .timeline-index { color: var(--success); font-size: var(--text-3xl); font-weight: 700; line-height: 1; }
    .panel-head { min-height: 58px; display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); padding: var(--space-4); border-bottom: 1px solid var(--border); }
    .panel-body { padding: var(--space-5); }
    .split-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(360px, .56fr); gap: var(--space-5); align-items: start; }
    .mini-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--space-3); margin-top: var(--space-5); }
    .mini { border: 1px solid var(--border-soft); padding: var(--space-4); background: var(--bg); }
    .mini strong { display: block; color: var(--success); font-size: var(--text-xl); line-height: 1; }
    .mini span { display: block; margin-top: var(--space-2); color: var(--muted); font-size: var(--text-xs); text-transform: uppercase; }
    form { display: grid; gap: var(--space-3); }
    label { display: grid; gap: var(--space-2); color: var(--meta); font-size: var(--text-xs); font-weight: 700; text-transform: uppercase; }
    input, select, textarea { width: 100%; min-height: 44px; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--bg); color: var(--fg); padding: 0 var(--space-3); outline: none; }
    textarea { min-height: 112px; padding-block: var(--space-3); resize: vertical; text-transform: none; }
    input:focus, select:focus, textarea:focus { border-color: var(--accent); box-shadow: var(--focus-ring); }
    .form-message { min-height: 24px; color: var(--warn); font-size: var(--text-sm); text-transform: none; }
    .download-row { justify-content: space-between; align-items: flex-start; gap: var(--space-3); }
    .footer { border-top: 1px solid var(--border); padding-block: var(--space-6); color: var(--muted); font-size: var(--text-xs); }
    .footer-row { justify-content: space-between; flex-wrap: wrap; text-transform: uppercase; letter-spacing: 0.08em; }
    /* 社交圆形图标 */
    .social-icons { display: flex; justify-content: center; gap: var(--space-6); padding: var(--space-8) 0; }
    .social-icon {
      width: 64px; height: 64px; border-radius: 50%;
      border: 2px solid var(--border); background: var(--surface);
      display: flex; align-items: center; justify-content: center;
      text-decoration: none; transition: all var(--motion-base) var(--ease-standard);
    }
    .social-icon span { font-size: 24px; font-weight: 700; }
    .social-icon:hover {
      border-color: var(--accent); transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(0,255,65,0.2);
    }
    /* 滚动揭示：元素初始隐藏，进入视口后加 .revealed 触发动画 */
    [data-reveal] { opacity: 0; transform: translateY(20px); transition: opacity 600ms var(--ease-standard), transform 600ms var(--ease-standard); }
    [data-reveal].revealed { opacity: 1; transform: translateY(0); }
    [data-reveal="2"] { transition-delay: 100ms; }
    [data-reveal="3"] { transition-delay: 180ms; }
    @media (prefers-reduced-motion: reduce) { [data-reveal] { opacity: 1; transform: none; transition: none; } }
    @keyframes hud-rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }
    @media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation-duration: 1ms !important; scroll-behavior: auto !important; transition-duration: 1ms !important; } }
    /* 首图立即可见；动态效果交给 WebGL 底纹，产品图片保持稳定比例。 */
    .hud-hero .hero-carousel { opacity: 1; }
    .hud-hero .hero-carousel-slide img { animation: none; transform: none; }
    @media (max-width: 820px) {
      .hud-hero .hero-carousel-slide img { transform: translateY(var(--hero-mobile-offset-y, 0)); }
    }
    @media (prefers-reduced-motion: reduce) { .hud-hero .hero-carousel { animation: none; } }
    /* 卡片 hover 微抬升 */
    .category-card, .quality-card, .download-card, .scenario-card { transition: transform var(--motion-base) var(--ease-standard), border-color var(--motion-fast) var(--ease-standard), box-shadow var(--motion-base) var(--ease-standard); }
    .category-card:hover, .quality-card:hover, .download-card:hover, .scenario-card:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: 0 8px 24px rgba(0,255,65,0.12); }
    @media (max-width: 980px) { .catalog-brief, .split-grid { grid-template-columns: 1fr; } .route-grid, .category-grid, .scenario-grid, .quality-grid, .download-grid, .contact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .timeline { grid-template-columns: repeat(2, minmax(0, 1fr)); } .hud-hero { padding-block: 0; min-height: 680px; } }
    @media (max-width: 820px) { .container { width: min(100% - var(--container-gutter-tablet) * 2, var(--container-max)); } .nav-links, .nav-actions .btn-primary { display: none; } .mobile-menu-btn { display: flex; } section { padding-block: var(--section-y-tablet); } .hud-hero { padding-block: 0; min-height: 620px; } .section-head { grid-template-columns: 1fr; } .hero-metrics, .route-grid, .category-grid, .scenario-grid, .quality-grid, .download-grid, .contact-grid, .timeline, .mini-grid { grid-template-columns: 1fr; } .product-row { grid-template-columns: 92px 1fr; } .product-row .status-chip { grid-column: 2; width: fit-content; } }
    @media (max-width: 520px) { .container { width: min(100% - var(--container-gutter-phone) * 2, var(--container-max)); } section { padding-block: var(--section-y-phone); } .hud-hero { padding-block: 0; min-height: 600px; } .brand-logo { height: 28px; } .nav-actions .btn:not(.lang-trigger) { display: none; } .hero-actions, .inline-actions { display: grid; grid-template-columns: 1fr; } .product-row { grid-template-columns: 1fr; } .product-media { height: 160px; } }

    /* 浮动联系栏 */
    .floating-contacts {
      position: fixed; bottom: 24px; right: 24px; z-index: 100;
      display: flex; flex-direction: column; align-items: flex-end; gap: var(--space-3);
    }
    .floating-contacts-toggle {
      width: 56px; height: 56px; border-radius: 50%;
      border: 2px solid var(--accent); background: var(--surface);
      color: var(--accent); display: flex; align-items: center; justify-content: center;
      cursor: pointer; transition: all var(--motion-base) var(--ease-standard);
      box-shadow: 0 4px 24px rgba(0,255,65,0.15);
    }
    .floating-contacts-toggle:hover {
      background: var(--accent); color: var(--accent-on);
      transform: scale(1.08); box-shadow: 0 4px 32px rgba(0,255,65,0.3);
    }
    .floating-contacts-list {
      display: none; flex-direction: column; gap: var(--space-2);
      padding: var(--space-3); border: 1px solid var(--border);
      background: var(--surface); border-radius: var(--radius-md);
      box-shadow: var(--elev-raised); min-width: 180px;
    }
    .floating-contacts.open .floating-contacts-list { display: flex; }
    .floating-contacts.open .floating-contacts-toggle { transform: rotate(45deg); }
    .fc-item {
      display: flex; align-items: center; gap: var(--space-3);
      padding: var(--space-3) var(--space-4); border-radius: var(--radius-sm);
      text-decoration: none; color: var(--fg); font-size: var(--text-sm);
      transition: all var(--motion-fast) var(--ease-standard);
      border: 1px solid transparent;
    }
    .fc-item:hover { border-color: var(--accent); background: var(--bg); transform: translateX(4px); }
    .fc-icon {
      width: 36px; height: 36px; border-radius: var(--radius-sm);
      display: flex; align-items: center; justify-content: center;
      font-size: 18px; font-weight: 700; flex-shrink: 0;
    }
    .fc-label { font-weight: 600; letter-spacing: 0.02em; }
    .fc-value { font-size: var(--text-xs); color: var(--muted); margin-top: 2px; }
    @media (max-width: 520px) {
      .floating-contacts { bottom: 16px; right: 16px; }
      .floating-contacts-toggle { width: 48px; height: 48px; }
      .floating-contacts-list { min-width: 160px; }
    }    /* 跳转链接：键盘导航可达，默认隐藏 */
    .skip-link { position: absolute; left: -9999px; z-index: 9999; }
    .skip-link:focus {
      position: fixed; top: 0; left: 0; padding: var(--space-3) var(--space-4);
      background: var(--accent); color: var(--bg); font-weight: 500;
      text-decoration: none; box-shadow: 0 4px 12px rgba(0,0,0,.3);
    }

/* Internationalization: keep the RTL locale readable without changing the HUD language. */
html[dir="rtl"] body { direction: rtl; }
html[dir="rtl"] .hero-overlay { align-items: flex-start; text-align: right; }
html[dir="rtl"] .hero-facts span { padding-left: 0; padding-right: var(--space-3); border-left: 0; border-right: 2px solid var(--accent); }
html[dir="rtl"] .lang-popover { right: auto; left: 0; }
html[lang="ar"] { --font-display: "Noto Kufi Arabic", "Segoe UI", Tahoma, sans-serif; --font-body: "Noto Sans Arabic", "Segoe UI", Tahoma, sans-serif; }
.lang-popover { max-height: min(70vh, 420px); overflow-y: auto; }

/* Product thumbnails must preserve the complete product silhouette on narrow screens. */
.product-media { display: grid; place-items: center; }
.product-media img,
.product-media img.core-product-image { object-fit: contain; padding: 6px; opacity: 1; filter: none; background: var(--surface-warm); }
@media (max-width: 820px) {
  .product-media { min-height: 128px; height: auto; aspect-ratio: 16 / 9; }
}
@media (max-width: 520px) {
  .product-media { min-height: 160px; aspect-ratio: 16 / 9; }
}