:root {
    --bg: #ffffff;
    --surface: #ffffff;
    --text: #1a1a1a;
    --text-muted: #666666;
    --border: #e4e4e4;
    --border-strong: #d4d4d4;
    --accent: #0057ff;
    --accent-hover: #0044cc;
    --accent-soft: #f0f4ff;
    --warning-bg: #fff8e6;
    --warning-border: #f0d78c;
    --warning-text: #7a5c00;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.07);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.09);
  }

  * { box-sizing: border-box; }

  html { scroll-behavior: smooth; }

  body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.65;
    background: var(--bg);
    color: var(--text);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
  }

  .container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 24px;
  }

  /* ---- Notice bar ---- */
  .notice {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
    color: var(--warning-text);
    padding: 14px 20px;
    font-size: 14px;
    border-radius: var(--radius-sm);
    margin: 28px 0 0;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    line-height: 1.5;
  }
  .notice svg { flex-shrink: 0; margin-top: 2px; }

  /* ---- Hero ---- */
  .hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
    padding: 56px 0 40px;
  }
  .hero-badge {
    display: inline-block;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 6px 12px;
    border-radius: 100px;
    margin-bottom: 18px;
  }
  .hero h1 {
    font-size: 40px;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin: 0 0 8px;
  }
  .hero h1 .model {
    display: block;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-muted);
    letter-spacing: 0.02em;
    margin-top: 10px;
  }
  .hero .tagline {
    font-size: 18px;
    color: var(--text-muted);
    margin: 18px 0 24px;
    line-height: 1.6;
  }
  .hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
  }
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 22px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    cursor: pointer;
  }
  .btn-primary {
    background: var(--accent);
    color: #fff;
  }
  .btn-primary:hover { background: var(--accent-hover); }
  .btn-secondary {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border);
  }
  .btn-secondary:hover { border-color: var(--border-strong); }
  .hero-image {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: var(--surface);
    border: 1px solid var(--border);
  }
  .hero-image img { width: 100%; height: auto; display: block; }

  /* ---- Section base ---- */
  section { padding: 56px 0; }
  .section-head {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 40px;
  }
  .section-head h2 {
    font-size: 30px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0 0 12px;
  }
  .section-head p {
    color: var(--text-muted);
    font-size: 16px;
    margin: 0;
  }

  /* ---- Highlights grid ---- */
  .highlights {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
  }
  .highlight-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px 20px;
    transition: all 0.25s ease;
  }
  .highlight-card:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
  }
  .highlight-card .value {
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 4px;
  }
  .highlight-card .label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
    letter-spacing: 0.02em;
    text-transform: uppercase;
  }

  /* ---- Feature split ---- */
  .split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
  }
  .split.reverse .split-image { order: 2; }
  .split.reverse .split-text { order: 1; }
  .split-image {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    background: var(--surface);
    border: 1px solid var(--border);
  }
  .split-image img { width: 100%; height: auto; display: block; }
  .split-text h3 {
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0 0 16px;
  }
  .split-text p {
    color: var(--text-muted);
    font-size: 16px;
    margin: 0 0 20px;
  }
  .check-list {
    list-style: none;
    padding: 0;
    margin: 0;
  }
  .check-list li {
    position: relative;
    padding-left: 30px;
    margin-bottom: 14px;
    font-size: 15px;
    line-height: 1.55;
  }
  .check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-soft);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230057ff' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
    background-size: 11px;
    background-position: center;
    background-repeat: no-repeat;
  }

  /* ---- Specs table ---- */
  .specs-wrap {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
  }
  table.specs {
    width: 100%;
    border-collapse: collapse;
    font-size: 15px;
  }
  table.specs tr { border-bottom: 1px solid var(--border); }
  table.specs tr:last-child { border-bottom: none; }
  table.specs td {
    padding: 14px 20px;
    vertical-align: top;
  }
  table.specs td.label {
    color: var(--text-muted);
    font-weight: 500;
    width: 25%;
    background: #f7f7f7;
  }
  table.specs td.value {
    width: 25%;
    font-weight: 500;
  }

  /* ---- Interface section ---- */
  .interface-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  .interface-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
  }
  .interface-card .pin-count {
    font-size: 36px;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 8px;
  }
  .interface-card h4 {
    font-size: 17px;
    font-weight: 600;
    margin: 0 0 10px;
  }
  .interface-card p {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.6;
  }

  /* ---- Driver boards ---- */
  .driver-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }
  .driver-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all 0.25s ease;
    text-decoration: none;
    color: inherit;
    display: block;
  }
  .driver-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--border-strong);
  }
  .driver-card img {
    width: 100%;
    height: 180px;
    object-fit: contain;
    padding: 24px;
    background: #fafafa;
  }
  .driver-card .body {
    padding: 20px 24px 24px;
    border-top: 1px solid var(--border);
  }
  .driver-card .body h4 {
    font-size: 16px;
    font-weight: 600;
    margin: 0 0 6px;
  }
  .driver-card .body p {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0;
  }
  .driver-card .body .tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    padding: 3px 8px;
    border-radius: 4px;
    background: #fff4e0;
    color: #b06000;
    margin-top: 10px;
  }

  /* ---- Downloads ---- */
  .downloads {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }
  .download-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 20px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    text-decoration: none;
    color: var(--text);
    font-size: 15px;
    font-weight: 500;
    transition: all 0.2s ease;
  }
  .download-item:hover {
    border-color: var(--accent);
    background: var(--accent-soft);
  }
  .download-item svg {
    flex-shrink: 0;
    color: var(--accent);
  }

  /* ---- Applications ---- */
  .apps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
  .app-card {
    text-align: center;
  }
  .app-card .thumb {
    border-radius: var(--radius);
    overflow: hidden;
    aspect-ratio: 4 / 3;
    background: var(--surface);
    border: 1px solid var(--border);
    margin-bottom: 14px;
  }
  .app-card .thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
  }
  .app-card h4 {
    font-size: 15px;
    font-weight: 600;
    margin: 0;
  }

  /* ---- Eco ---- */
  .eco-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
  .eco-card {
    text-align: center;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 24px;
  }
  .eco-card img {
    width: 64px;
    height: 64px;
    object-fit: contain;
    margin-bottom: 16px;
  }
  .eco-card h4 {
    font-size: 17px;
    font-weight: 600;
    margin: 0 0 8px;
  }
  .eco-card p {
    font-size: 14px;
    color: var(--text-muted);
    margin: 0;
    line-height: 1.6;
  }

  /* ---- Recommendations ---- */
  .rec-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
  .rec-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    text-decoration: none;
    color: inherit;
    transition: all 0.25s ease;
    display: block;
  }
  .rec-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
    border-color: var(--border-strong);
  }
  .rec-card img {
    width: 100%;
    height: 160px;
    object-fit: contain;
    padding: 16px;
    background: #fafafa;
  }
  .rec-card .body {
    padding: 14px 18px 20px;
    border-top: 1px solid var(--border);
  }
  .rec-card .body p {
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-muted);
    margin: 0;
  }

  /* ---- CTA / Contact ---- */
  .cta {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 48px;
    text-align: center;
    box-shadow: var(--shadow-sm);
  }
  .cta h3 {
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin: 0 0 12px;
  }
  .cta p {
    color: var(--text-muted);
    font-size: 16px;
    margin: 0 0 24px;
  }
  .cta .contact-line {
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-muted);
  }
  .cta .contact-line a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
  }
  .cta .contact-line a:hover { text-decoration: underline; }

  /* ---- Footer note ---- */
  .footer-note {
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
    padding: 40px 0 60px;
    border-top: 1px solid var(--border);
    margin-top: 40px;
  }

  /* ---- Responsive ---- */
  @media (max-width: 960px) {
    .highlights { grid-template-columns: repeat(2, 1fr); }
    .apps-grid { grid-template-columns: repeat(2, 1fr); }
    .rec-grid { grid-template-columns: repeat(2, 1fr); }
  }

  @media (max-width: 768px) {
    .container { padding: 0 18px; }
    .hero {
      grid-template-columns: 1fr;
      gap: 32px;
      padding: 32px 0 24px;
    }
    .hero h1 { font-size: 30px; }
    .hero .tagline { font-size: 16px; }
    section { padding: 40px 0; }
    .section-head h2 { font-size: 24px; }
    .split { grid-template-columns: 1fr; gap: 32px; }
    .split.reverse .split-image { order: 1; }
    .split.reverse .split-text { order: 2; }
    .interface-grid { grid-template-columns: 1fr; }
    .driver-grid { grid-template-columns: 1fr; }
    .downloads { grid-template-columns: 1fr; }
    .eco-grid { grid-template-columns: 1fr; }
    .cta { padding: 32px 24px; }
    table.specs td.label { width: 38%; }
    table.specs td.value { width: 12%; }
    table.specs td { padding: 12px 14px; font-size: 14px; }
  }

  @media (max-width: 520px) {
    .highlights { grid-template-columns: 1fr 1fr; gap: 12px; }
    .highlight-card { padding: 18px 16px; }
    .highlight-card .value { font-size: 22px; }
    .apps-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
    .rec-grid { grid-template-columns: 1fr; }
  }