/* ============================================================
       Seed Tokens — Key design decisions exposed via Nudges
       ============================================================ */
    :root {
      --seed-bg: #101216;
      --seed-fg: #f0f1f3;
      --seed-primary: #00b3ff;
      --seed-accent: #bccdd4;
      --seed-surface: #1a1d22;
      --seed-radius: 8;

      /* Derived tokens */
      --bg: var(--seed-bg);
      --bg-elevated: color-mix(in srgb, var(--seed-surface) 80%, var(--seed-bg));
      --fg: var(--seed-fg);
      --fg-secondary: color-mix(in srgb, var(--seed-fg) 65%, transparent);
      --fg-tertiary: color-mix(in srgb, var(--seed-fg) 38%, transparent);
      --fg-subtle: color-mix(in srgb, var(--seed-fg) 22%, transparent);
      --accent: var(--seed-primary);
      --accent-muted: color-mix(in srgb, var(--seed-primary) 15%, transparent);
      --accent-text: var(--seed-primary);
      --surface: var(--seed-surface);
      --surface-hover: color-mix(in srgb, var(--seed-fg) 5%, var(--seed-bg));
      --border: color-mix(in srgb, var(--seed-fg) 8%, transparent);
      --border-hover: color-mix(in srgb, var(--seed-fg) 14%, transparent);
      --nav-bg: color-mix(in srgb, var(--seed-bg) 75%, transparent);
      --radius: calc(var(--seed-radius) * 1px);
      --radius-lg: calc(var(--seed-radius) * 1.5px);

      /* Spacing */
      --section-padding: clamp(64px, 10vh, 120px);
      --container-width: 1200px;
      --nav-height: 64px;

      /* Typography */
      --font-sans: 'Inter', 'Noto Sans SC', -apple-system, system-ui, 'Segoe UI', sans-serif;
      --font-display: 'Inter', 'Noto Sans SC', -apple-system, system-ui, sans-serif;
    }

    /* Light Theme */
    [data-theme="light"] {
      --seed-bg: #fafafa;
      --seed-fg: #1a1d22;
      --seed-primary: #0095d9;
      --seed-accent: #6b7b82;
      --seed-surface: #ffffff;
      --nav-bg: color-mix(in srgb, var(--seed-bg) 80%, transparent);
      --border: color-mix(in srgb, var(--seed-fg) 10%, transparent);
      --border-hover: color-mix(in srgb, var(--seed-fg) 18%, transparent);
      --surface-hover: color-mix(in srgb, var(--seed-fg) 4%, var(--seed-bg));
    }

    [data-theme="light"] .nav-logo img,
    [data-theme="light"] .hero-logo-mark img {
      content: url("../images/logo-aeris-full.svg");
    }

    /* ============================================================
       Reset & Base
       ============================================================ */
    *, *::before, *::after {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    body {
      font-family: var(--font-sans);
      font-size: 16px;
      font-weight: 400;
      line-height: 1.6;
      color: var(--fg-secondary);
      background: var(--bg);
      overflow-x: hidden;
      transition: background-color 0.4s ease, color 0.4s ease;
    }

    ::selection {
      background: var(--accent-muted);
      color: var(--fg);
    }

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

    img { max-width: 100%; display: block; }
    button { font-family: inherit; cursor: pointer; border: none; background: none; }

    .container {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 clamp(20px, 4vw, 48px);
    }

    /* ============================================================
       Bilingual Toggle
       ============================================================ */
    .en { display: none; }
    .lang-en .zh { display: none; }
    .lang-en .en { display: initial; }
    .lang-en .zh-block { display: none; }
    .lang-en .en-block { display: block; }
    .zh-block { display: block; }
    .en-block { display: none; }

    /* ============================================================
       Navigation
       ============================================================ */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: var(--nav-height);
      z-index: 100;
      transition: background-color 0.3s ease, border-color 0.3s ease;
      border-bottom: 1px solid transparent;
    }

    .nav.scrolled {
      background: var(--nav-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom-color: var(--border);
    }

    .nav-inner {
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 clamp(20px, 4vw, 48px);
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .nav-logo {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .nav-logo img {
      height: 32px;
      width: auto;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-size: 13px;
      font-weight: 500;
      letter-spacing: 0.02em;
      color: var(--fg-secondary);
      transition: color 0.2s ease;
      line-height: 2.67;
    }

    .nav-links a:hover {
      color: var(--fg);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .theme-toggle,
    .lang-toggle {
      font-size: 12px;
      font-weight: 500;
      letter-spacing: 0.02em;
      color: var(--fg-secondary);
      padding: 6px 14px;
      border-radius: 9999px;
      border: 1px solid var(--border);
      background: transparent;
      transition: all 0.2s ease;
      line-height: 1.4;
    }

    .lang-toggle {
      width: 44px;
      text-align: center;
      padding: 6px 0;
    }

    .theme-toggle {
      width: 44px;
      text-align: center;
      padding: 6px 0;
    }

    .theme-toggle:hover,
    .lang-toggle:hover {
      color: var(--fg);
      border-color: var(--border-hover);
      background: var(--surface-hover);
    }

    .nav-mobile-toggle {
      display: none;
      width: 36px;
      height: 36px;
      align-items: center;
      justify-content: center;
      color: var(--fg);
    }

    .nav-mobile-toggle svg {
      width: 20px;
      height: 20px;
    }

    /* ============================================================
       Hero Section
       ============================================================ */
    .hero {
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      position: relative;
      overflow: hidden;
      padding-top: var(--nav-height);
    }

    .hero-bg {
      position: absolute;
      inset: 0;
      pointer-events: none;
      overflow: hidden;
    }

    .hero-bg-grid {
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
      background-size: 60px 60px;
      opacity: 0.4;
      mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
      -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 50%, black 20%, transparent 70%);
    }

    .hero-bg-waves {
      position: absolute;
      bottom: -10%;
      left: 50%;
      transform: translateX(-50%);
      width: 140%;
      height: 60%;
      opacity: 0.12;
    }

    .hero-bg-waves path {
      fill: none;
      stroke: var(--accent);
      stroke-width: 1.2;
    }

    .hero-bg-glow {
      position: absolute;
      top: 30%;
      left: 50%;
      transform: translate(-50%, -50%);
      width: 600px;
      height: 600px;
      border-radius: 50%;
      background: var(--accent);
      opacity: 0.03;
      filter: blur(120px);
    }

    .hero-content {
      position: relative;
      z-index: 1;
      text-align: center;
      max-width: 800px;
      padding: 0 clamp(20px, 4vw, 48px);
    }

    .hero-logo-mark {
      width: 200px;
      margin: 0 auto 32px;
      opacity: 0;
      animation: fadeUp 0.8s ease forwards;
      animation-delay: 0.1s;
    }

    .hero-logo-mark img {
      width: 100%;
      height: auto;
    }

    .hero-headline {
      font-family: var(--font-display);
      font-size: clamp(36px, 6vw, 64px);
      font-weight: 600;
      line-height: 1.05;
      letter-spacing: -0.025em;
      color: var(--fg);
      margin-bottom: 8px;
      opacity: 0;
      animation: fadeUp 0.8s ease forwards;
      animation-delay: 0.2s;
    }

    .hero-headline-en {
      font-family: var(--font-display);
      font-size: clamp(14px, 1.8vw, 18px);
      font-weight: 500;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--fg-tertiary);
      margin-bottom: 32px;
      opacity: 0;
      animation: fadeUp 0.8s ease forwards;
      animation-delay: 0.35s;
    }

    .hero-sub {
      font-size: clamp(16px, 2vw, 18px);
      font-weight: 400;
      line-height: 1.6;
      color: var(--fg-secondary);
      max-width: 560px;
      margin: 0 auto 48px;
      opacity: 0;
      animation: fadeUp 0.8s ease forwards;
      animation-delay: 0.5s;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      opacity: 0;
      animation: fadeUp 0.8s ease forwards;
      animation-delay: 0.65s;
    }

    .hero-scroll-indicator {
      position: absolute;
      bottom: 32px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      opacity: 0;
      animation: fadeIn 1s ease forwards;
      animation-delay: 1.2s;
    }

    .hero-scroll-indicator span {
      font-size: 11px;
      font-weight: 500;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--fg-subtle);
    }

    .scroll-arrow {
      width: 28px;
      height: 28px;
      color: var(--fg-tertiary);
      animation: scrollFloat 2s ease-in-out infinite;
    }

    .scroll-arrow svg {
      width: 100%;
      height: 100%;
    }

    /* ============================================================
       Buttons
       ============================================================ */
    .btn {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 500;
      letter-spacing: 0.02em;
      padding: 12px 28px;
      border-radius: var(--radius);
      transition: all 0.25s ease;
      line-height: 1.4;
    }

    .btn-primary {
      background: var(--accent);
      color: #fff;
    }

    .btn-primary:hover {
      filter: brightness(1.15);
      transform: translateY(-1px);
    }

    .btn-ghost {
      background: color-mix(in srgb, var(--seed-fg) 3%, transparent);
      color: var(--fg-secondary);
      border: 1px solid var(--border);
    }

    .btn-ghost:hover {
      color: var(--fg);
      border-color: var(--border-hover);
      background: var(--surface-hover);
    }

    .btn svg {
      width: 16px;
      height: 16px;
    }

    /* ============================================================
       Section Base
       ============================================================ */
    .section {
      padding: var(--section-padding) 0;
    }

    .section-label {
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--accent-text);
      margin-bottom: 20px;
    }

    .section-title {
      font-family: var(--font-display);
      font-size: clamp(44px, 6vw, 72px);
      font-weight: 600;
      line-height: 1.08;
      letter-spacing: -0.025em;
      color: var(--fg);
      margin-bottom: 20px;
    }

    .section-desc {
      font-size: clamp(16px, 1.8vw, 19px);
      line-height: 1.65;
      color: var(--fg-secondary);
      max-width: 640px;
    }

    .section-header {
      margin-bottom: clamp(40px, 6vw, 72px);
    }

    /* ============================================================
       Technology Cards
       ============================================================ */
    .tech-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .tech-card {
      padding: 32px 28px;
      border-radius: var(--radius-lg);
      background: color-mix(in srgb, var(--seed-fg) 2%, var(--bg));
      border: 1px solid var(--border);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .tech-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: var(--accent);
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .tech-card:hover {
      border-color: var(--border-hover);
      background: var(--surface-hover);
      transform: translateY(-4px);
    }

    .tech-card:hover::before {
      opacity: 1;
    }

    .tech-card-icon {
      width: 44px;
      height: 44px;
      margin-bottom: 24px;
      color: var(--accent-text);
    }

    .tech-card-icon svg {
      width: 100%;
      height: 100%;
      stroke: currentColor;
      stroke-width: 1.6;
      stroke-linecap: round;
      stroke-linejoin: round;
      fill: none;
    }

    .tech-card-title {
      font-size: 18px;
      font-weight: 600;
      letter-spacing: -0.01em;
      color: var(--fg);
      margin-bottom: 10px;
      line-height: 1.3;
    }

    .tech-card-desc {
      font-size: 14px;
      line-height: 1.6;
      color: var(--fg-secondary);
    }

    /* ============================================================
       Product Section
       ============================================================ */
    .product-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: clamp(40px, 6vw, 80px);
      align-items: center;
      margin-bottom: clamp(60px, 8vw, 100px);
    }

    .product-row:last-child {
      margin-bottom: 0;
    }

    .product-row--reverse {
      direction: rtl;
    }

    .product-row--reverse > * {
      direction: ltr;
    }

    .product-visual {
      aspect-ratio: 4/3;
      border-radius: var(--radius-lg);
      background: var(--surface);
      border: 1px solid var(--border);
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
      position: relative;
    }

    /* 产品渲染图为透明底 PNG，统一补白底，避免暗色主题下透出容器背景 */
    .product-visual img {
      width: 100%;
      height: 100%;
      background: #fff;
    }

    .product-visual-label {
      position: absolute;
      bottom: 16px;
      left: 16px;
      font-size: 11px;
      font-weight: 500;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: var(--fg-tertiary);
      padding: 4px 10px;
      border-radius: 4px;
      background: color-mix(in srgb, var(--seed-bg) 80%, transparent);
      backdrop-filter: blur(8px);
    }

    .product-info {
      max-width: 480px;
    }

    .product-tag {
      display: inline-block;
      font-size: 11px;
      font-weight: 600;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--accent-text);
      margin-bottom: 16px;
      padding: 4px 12px;
      border-radius: 9999px;
      border: 1px solid var(--accent-muted);
      background: color-mix(in srgb, var(--accent) 5%, transparent);
    }

    .product-title {
      font-family: var(--font-display);
      font-size: clamp(24px, 3vw, 32px);
      font-weight: 600;
      line-height: 1.15;
      letter-spacing: -0.015em;
      color: var(--fg);
      margin-bottom: 16px;
    }

    .product-desc {
      font-size: 15px;
      line-height: 1.65;
      color: var(--fg-secondary);
      margin-bottom: 28px;
    }

    .product-metrics {
      display: flex;
      gap: 36px;
    }

    .product-metric-value {
      font-family: var(--font-display);
      font-size: 28px;
      font-weight: 600;
      letter-spacing: -0.02em;
      color: var(--fg);
      line-height: 1.2;
    }

    .product-metric-unit {
      font-size: 16px;
      font-weight: 400;
      color: var(--accent-text);
    }

    .product-metric-label {
      font-size: 13px;
      color: var(--fg-tertiary);
      margin-top: 4px;
    }

    /* ============================================================
       About Section
       ============================================================ */
    .about-section {
      /* Uses default page background for consistency */
    }

    .about-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: clamp(40px, 6vw, 80px);
      align-items: center;
    }

    .about-text {
      font-size: clamp(16px, 1.8vw, 19px);
      line-height: 1.7;
      color: var(--fg-secondary);
      max-width: 60ch;
    }

    .about-text strong {
      color: var(--fg);
      font-weight: 500;
    }

    .about-stats {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    .about-stat {
      padding: 28px 24px;
      background: color-mix(in srgb, var(--seed-fg) 2%, var(--bg));
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      transition: all 0.3s ease;
    }

    .about-stat:hover {
      border-color: var(--border-hover);
      background: var(--surface-hover);
      transform: translateY(-2px);
    }

    .about-stat:nth-child(2n) {
      border-left: 1px solid var(--border);
    }

    .about-stat:nth-child(-n+2) {
      border-top: 1px solid var(--border);
    }

    .about-stat-value {
      font-family: var(--font-display);
      font-size: 40px;
      font-weight: 600;
      letter-spacing: -0.02em;
      color: var(--fg);
      line-height: 1.1;
      margin-bottom: 8px;
    }

    .about-stat-label {
      font-size: 14px;
      color: var(--fg-tertiary);
    }

    /* ============================================================
       Contact Section
       ============================================================ */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: clamp(40px, 6vw, 80px);
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 28px;
      padding-top: 8px;
    }

    .contact-info-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
    }

    .contact-info-icon {
      width: 20px;
      height: 20px;
      color: var(--accent-text);
      flex-shrink: 0;
      margin-top: 2px;
    }

    .contact-info-icon svg {
      width: 100%;
      height: 100%;
      stroke: currentColor;
      stroke-width: 1.6;
      stroke-linecap: round;
      stroke-linejoin: round;
      fill: none;
    }

    .contact-info-label {
      font-size: 12px;
      font-weight: 500;
      letter-spacing: 0.04em;
      color: var(--fg-tertiary);
      margin-bottom: 4px;
    }

    .contact-info-value {
      font-size: 15px;
      color: var(--fg);
      line-height: 1.5;
    }

    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-form input,
    .contact-form textarea {
      font-family: var(--font-sans);
      font-size: 15px;
      color: var(--fg);
      background: color-mix(in srgb, var(--seed-fg) 3%, var(--bg));
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 14px 18px;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .contact-form input::placeholder,
    .contact-form textarea::placeholder {
      color: var(--fg-tertiary);
    }

    .contact-form input:focus,
    .contact-form textarea:focus {
      border-color: var(--accent);
    }

    .contact-form textarea {
      resize: vertical;
      min-height: 120px;
    }

    .contact-form .btn-primary {
      align-self: flex-start;
    }

    /* ============================================================
       Footer
       ============================================================ */
    .footer {
      padding: 40px 0;
      border-top: 1px solid var(--border);
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .footer-text {
      font-size: 13px;
      color: var(--fg-tertiary);
    }

    .footer-icp {
      font-size: 12px;
      color: var(--fg-subtle);
      margin-top: 6px;
    }

    .footer-icp a {
      color: inherit;
      text-decoration: none;
    }

    .footer-icp a:hover {
      color: var(--fg-secondary);
    }

    .footer-links {
      display: flex;
      gap: 24px;
    }

    .footer-links a {
      font-size: 13px;
      color: var(--fg-tertiary);
      transition: color 0.2s ease;
    }

    .footer-links a:hover {
      color: var(--fg);
    }

    /* ============================================================
       Modal
       ============================================================ */
    .modal-overlay {
      display: none;
      position: fixed;
      inset: 0;
      z-index: 200;
      background: rgba(0,0,0,0.6);
      backdrop-filter: blur(4px);
      -webkit-backdrop-filter: blur(4px);
      justify-content: center;
      align-items: center;
      padding: 24px;
    }

    .modal-overlay.open {
      display: flex;
    }

    .modal {
      background: var(--bg);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      max-width: 680px;
      width: 100%;
      max-height: 80vh;
      display: flex;
      flex-direction: column;
      overflow: hidden;
      position: relative;
    }

    .modal-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 20px 28px;
      border-bottom: 1px solid var(--border);
      flex-shrink: 0;
    }

    .modal-title {
      font-size: 20px;
      font-weight: 600;
      color: var(--fg);
      letter-spacing: -0.01em;
    }

    .modal-close {
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--fg-tertiary);
      border-radius: var(--radius);
      transition: all 0.2s ease;
      cursor: pointer;
    }

    .modal-close:hover {
      color: var(--fg);
      background: var(--surface-hover);
    }

    .modal-close svg {
      width: 18px;
      height: 18px;
    }

    .modal-body {
      padding: 28px;
      padding-bottom: 60px;
      overflow-y: auto;
      flex: 1;
    }

    .modal-scroll-hint {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(to bottom, transparent, var(--bg));
      pointer-events: none;
      transition: opacity 0.3s ease;
    }

    .modal-scroll-hint.hidden {
      opacity: 0;
    }

    .modal-scroll-hint svg {
      width: 20px;
      height: 20px;
      color: var(--fg-tertiary);
      animation: scrollFloat 2s ease-in-out infinite;
    }

    .modal-body h3 {
      font-size: 16px;
      font-weight: 600;
      color: var(--fg);
      margin: 24px 0 10px;
    }

    .modal-body h3:first-child {
      margin-top: 0;
    }

    .modal-body p {
      font-size: 14px;
      line-height: 1.7;
      color: var(--fg-secondary);
      margin-bottom: 12px;
    }

    .modal-body ul {
      font-size: 14px;
      line-height: 1.7;
      color: var(--fg-secondary);
      padding-left: 20px;
      margin-bottom: 12px;
    }

    .modal-body ul li {
      margin-bottom: 6px;
    }

    .modal-loading {
      text-align: center;
      padding: 40px 0;
      font-size: 14px;
      color: var(--fg-tertiary);
    }

    /* ============================================================
       Scroll Reveal Animation
       ============================================================ */
    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }

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

    .reveal-delay-1 { transition-delay: 0.1s; }
    .reveal-delay-2 { transition-delay: 0.2s; }
    .reveal-delay-3 { transition-delay: 0.3s; }
    .reveal-delay-4 { transition-delay: 0.4s; }

    /* ============================================================
       Keyframes
       ============================================================ */
    @keyframes fadeUp {
      from {
        opacity: 0;
        transform: translateY(20px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    @keyframes fadeIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }

    @keyframes scrollFloat {
      0%, 100% { transform: translateY(0); opacity: 0.5; }
      50% { transform: translateY(8px); opacity: 1; }
    }

    /* ============================================================
       Responsive
       ============================================================ */
    @media (max-width: 1024px) {
      .tech-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      :root {
        --nav-height: 56px;
      }

      .nav-links {
        display: none;
      }

      .nav-mobile-toggle {
        display: flex;
      }

      .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--nav-bg);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--border);
        padding: 20px clamp(20px, 4vw, 48px);
        gap: 16px;
      }

      .tech-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
      }

      .tech-card {
        padding: 20px 16px;
      }

      .tech-card-icon {
        width: 36px;
        height: 36px;
        margin-bottom: 16px;
      }

      .tech-card-title {
        font-size: 16px;
      }

      .tech-card-desc {
        font-size: 13px;
      }

      .product-row,
      .product-row--reverse {
        grid-template-columns: 1fr;
        direction: ltr;
      }

      .product-row--reverse > * {
        direction: ltr;
      }

      .product-visual {
        order: -1;
      }

      .about-grid,
      .contact-grid {
        grid-template-columns: 1fr;
      }

      .footer-inner {
        flex-direction: column;
        gap: 16px;
        text-align: center;
      }

      .hero-headline {
        font-size: clamp(32px, 8vw, 48px);
      }
    }

    @media (max-width: 480px) {
      .product-metrics {
        flex-direction: column;
        gap: 20px;
      }

      .about-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
      }

      .about-stat {
        padding: 20px 16px;
      }

      .about-stat-value {
        font-size: 32px;
      }
    }

    /* ============================================================
       Mobile nav overlay
       ============================================================ */
    .nav-overlay {
      display: none;
      position: fixed;
      inset: 0;
      z-index: 99;
      background: rgba(0,0,0,0.3);
    }

    .nav-overlay.open {
      display: block;
    }