:root {
        --bg: #f5efe6;
        --panel: #fffaf2;
        --panel-strong: #ffffff;
        --ink: #1d2630;
        --muted: #66707d;
        --line: #ded3c1;
        --accent: #f48b20;
        --accent-dark: #d46d00;
        --navy: #223546;
        --shadow: 0 18px 46px rgba(24, 31, 40, 0.08);
        --r-xl: 28px;
        --r-lg: 18px;
        --r-md: 14px;
        --max: 1180px;
      }

      * { box-sizing: border-box; }
      html { scroll-behavior: smooth; }
      body {
        margin: 0;
        color: var(--ink);
        background:
          radial-gradient(circle at top left, rgba(244, 139, 32, 0.12), transparent 28%),
          linear-gradient(180deg, #faf5ed 0%, #f5efe6 100%);
        font-family: "Avenir Next", "PingFang SC", "Hiragino Sans GB", "Segoe UI", sans-serif;
      }

      img { display: block; max-width: 100%; }
      a { color: inherit; text-decoration: none; }
      h1, h2, h3, p { margin: 0; }

      .shell {
        width: min(var(--max), calc(100% - 40px));
        margin: 0 auto;
      }

      .site-header {
        position: sticky;
        top: 0;
        z-index: 50;
        backdrop-filter: blur(14px);
        background: rgba(250, 245, 237, 0.9);
        border-bottom: 1px solid rgba(222, 211, 193, 0.85);
      }

      .site-header-inner {
        width: min(var(--max), calc(100% - 40px));
        margin: 0 auto;
        min-height: 80px;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 24px;
      }

      .brand {
        display: flex;
        align-items: center;
        gap: 12px;
        min-width: 0;
      }

      .brand-mark {
        width: 34px;
        height: 34px;
        flex: 0 0 auto;
        object-fit: contain;
      }

      .brand-copy {
        display: flex;
        flex-direction: column;
        gap: 3px;
        min-width: 0;
      }

      .brand-copy strong {
        font-size: 1.06rem;
        line-height: 1.15;
      }

      .brand-copy span {
        color: var(--muted);
        font-size: 0.95rem;
      }

      .nav {
        display: flex;
        align-items: center;
        gap: 18px;
        flex-wrap: wrap;
        justify-content: flex-end;
        font-size: 0.96rem;
      }

      .nav > a,
      .nav summary {
        color: var(--muted);
        font-weight: 600;
        cursor: pointer;
        list-style: none;
      }

      .nav > a:hover,
      .nav summary:hover {
        color: var(--ink);
      }

      .nav summary {
        display: inline-flex;
        align-items: center;
        gap: 6px;
      }

      .nav summary::after {
        content: "";
        width: 7px;
        height: 7px;
        margin-top: -3px;
        border-right: 2px solid currentColor;
        border-bottom: 2px solid currentColor;
        transform: rotate(45deg);
        opacity: 0.72;
      }

      .lang-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-width: 88px;
        min-height: 38px;
        padding: 0 14px;
        border-radius: 999px;
        border: 1px solid var(--line);
        background: #fff;
        color: var(--navy);
        font: inherit;
        font-weight: 700;
        cursor: pointer;
      }

      details.nav-menu {
        position: relative;
      }

      details.nav-menu > summary::-webkit-details-marker { display: none; }

      .nav-panel {
        position: absolute;
        top: calc(100% + 12px);
        left: 0;
        min-width: 280px;
        padding: 10px;
        border-radius: 18px;
        background: rgba(255, 250, 242, 0.98);
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
      }

      .nav-panel a {
        display: block;
        padding: 11px 12px;
        border-radius: 12px;
        color: var(--ink);
        font-weight: 600;
      }

      .nav-panel a:hover {
        background: #f4ede0;
      }

      .quote-link {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-height: 44px;
        padding: 0 16px;
        border-radius: 999px;
        background: var(--accent);
        color: #fff;
        font-weight: 700;
        box-shadow: 0 10px 22px rgba(244, 139, 32, 0.24);
      }

      .hero {
        padding: 64px 0 40px;
      }

      .hero-grid {
        display: grid;
        grid-template-columns: 1.05fr 0.95fr;
        gap: 24px;
        align-items: stretch;
      }

      .panel {
        border: 1px solid rgba(222, 211, 193, 0.9);
        border-radius: var(--r-xl);
        background: rgba(255, 250, 242, 0.8);
        box-shadow: var(--shadow);
      }

      .hero-copy {
        padding: 42px;
      }

      .eyebrow {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        margin-bottom: 16px;
        color: var(--accent-dark);
        font-size: 0.88rem;
        font-weight: 800;
        text-transform: uppercase;
        letter-spacing: 0.02em;
      }

      .eyebrow::before {
        content: "";
        width: 30px;
        height: 2px;
        background: currentColor;
      }

      h1 {
        font-size: clamp(1.72rem, 2.55vw, 2.95rem);
        line-height: 0.98;
        max-width: none;
        margin-bottom: 16px;
      }

      .hero-copy h1 {
        min-height: 4.8em;
        max-width: 13.5ch;
        text-wrap: balance;
      }

      .hero-copy h1 .lang-zh {
        font-size: inherit;
        line-height: 1.04;
        white-space: normal;
        display: block;
      }

      body[data-lang="zh"] .hero-copy h1 {
        max-width: 13.2ch;
        font-size: clamp(1.45rem, 2.25vw, 2.05rem);
        line-height: 1.03;
      }

      body[data-lang="zh"] .hero-copy h1 .lang-zh {
        display: block;
        font-size: 0.94em;
        line-height: 1.03;
      }

      body[data-lang="zh"] .section-head h1 .lang-zh,
      body[data-lang="zh"] .section-head h2 .lang-zh,
      body[data-lang="zh"] .feature h3 .lang-zh,
      body[data-lang="zh"] .metric strong.lang-zh {
        white-space: normal;
        display: block;
      }

      body[data-lang="zh"] .section-head h1 .lang-zh,
      body[data-lang="zh"] .section-head h2 .lang-zh,
      body[data-lang="zh"] .feature h3 .lang-zh {
        line-height: 1.08;
      }

      .section-head h1,
      .section-head h2,
      .feature h3,
      .metric strong {
        text-wrap: balance;
      }

      .section-head h1,
      .section-head h2 {
        max-width: 18ch;
      }

      .section-head h1 {
        font-size: clamp(1.42rem, 2.2vw, 2.2rem);
        line-height: 1.05;
      }

      body[data-lang="zh"] .section-head h1,
      body[data-lang="zh"] .section-head h2 {
        max-width: 17.5ch;
        font-size: clamp(1.12rem, 1.55vw, 1.5rem);
        line-height: 1.08;
      }

      .section-head h1 .lang-zh,
      .section-head h2 .lang-zh,
      .feature h3 .lang-zh,
      .metric strong.lang-zh {
        font-size: 0.94em;
      }

      .metric span.lang-zh {
        display: block;
      }

      .field-label-text {
        display: inline-block;
        margin-bottom: 10px;
        font-weight: 700;
      }

      .zh-line {
        display: block;
        margin-top: 12px;
        font-size: 0.36em;
        line-height: 1.08;
        color: var(--navy);
      }

      .lang-zh,
      .zh-block {
        display: none;
      }

      body[data-lang="en"] .lang-en {
        display: revert;
      }

      body[data-lang="en"] .lang-zh {
        display: none !important;
      }

      body[data-lang="en"] .zh-block {
        display: none !important;
      }

      body[data-lang="zh"] .lang-en {
        display: none !important;
      }

      body[data-lang="zh"] .lang-zh {
        display: revert;
      }

      body[data-lang="zh"] .zh-block {
        display: block;
      }

      .lede {
        color: var(--muted);
        font-size: 1rem;
        line-height: 1.7;
        max-width: 54ch;
      }

      .lede + .lede { margin-top: 14px; }

      .hero-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
        margin-top: 26px;
      }

      .button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-height: 48px;
        padding: 0 20px;
        border-radius: 999px;
        border: 1px solid transparent;
        font-weight: 700;
      }

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

      .button.secondary {
        border-color: var(--line);
        background: transparent;
        color: var(--ink);
      }

      .hero-metrics {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 12px;
        margin-top: 28px;
      }

      .metric {
        padding: 16px;
        border-radius: var(--r-lg);
        background: #fff;
        border: 1px solid var(--line);
        min-height: 152px;
      }

      .metric strong {
        display: block;
        margin-bottom: 6px;
        font-size: 1.05rem;
      }

      .metric span {
        color: var(--muted);
        font-size: 0.92rem;
        line-height: 1.55;
      }

      .hero-media {
        overflow: hidden;
        min-height: 620px;
        position: relative;
      }

      .hero-media img {
        width: 100%;
        height: 100%;
        object-fit: cover;
      }

      .hero-note {
        position: absolute;
        left: 18px;
        right: 18px;
        bottom: 18px;
        padding: 16px 18px;
        border-radius: 18px;
        background: rgba(30, 40, 52, 0.78);
        color: #f8f4ea;
      }

      .hero-note strong {
        display: block;
        margin-bottom: 4px;
      }

      .hero-note span {
        color: rgba(248, 244, 234, 0.82);
        font-size: 0.92rem;
        line-height: 1.5;
      }

      section.block {
        padding: 34px 0;
      }

      .section-card {
        padding: 34px;
      }

      .section-head {
        display: flex;
        justify-content: space-between;
        gap: 24px;
        align-items: end;
        margin-bottom: 24px;
      }

      .section-head h2 {
        font-size: clamp(1.52rem, 2.35vw, 2.35rem);
        margin-bottom: 10px;
        line-height: 1.05;
        max-width: 18ch;
      }

      .section-head h2 {
        min-height: 2.7em;
      }

      .split-grid {
        display: grid;
        grid-template-columns: 0.95fr 1.05fr;
        gap: 20px;
      }

      .about-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 18px;
        align-items: stretch;
      }

      .about-copy {
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        min-height: 100%;
      }

      .about-photo {
        min-height: 100%;
      }

      .about-photo img {
        width: 100%;
        height: 100%;
        object-fit: cover;
      }

      .media-card,
      .copy-card,
      .contact-card {
        border: 1px solid var(--line);
        border-radius: 20px;
        background: #fff;
        overflow: hidden;
      }

      .media-card img {
        width: 100%;
        height: 100%;
        object-fit: cover;
      }

      .copy-card,
      .contact-card {
        padding: 28px;
        min-height: 100%;
      }

      .copy-card .lead,
      .contact-card .lead {
        font-size: 1.08rem;
        color: var(--ink);
        line-height: 1.75;
      }

      .copy-card p + p,
      .contact-card p + p {
        margin-top: 14px;
        color: var(--muted);
        line-height: 1.72;
      }

      .pill-row {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        margin-top: 20px;
      }

      .pill {
        padding: 10px 14px;
        border-radius: 999px;
        background: #f7f1e7;
        border: 1px solid var(--line);
        color: var(--navy);
        font-size: 0.92rem;
        font-weight: 700;
      }

      .feature-grid {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 16px;
      }

      .feature {
        padding: 18px;
        border-radius: 18px;
        background: #fff;
        border: 1px solid var(--line);
        min-height: 100%;
      }

      .feature .swatch {
        width: 100%;
        aspect-ratio: 4 / 3;
        border-radius: 12px;
        margin-bottom: 14px;
      }

      .swatch.yellow { background: linear-gradient(135deg, #fef95e, #ebf939 44%, #9eab19 100%); }
      .swatch.orange { background: linear-gradient(135deg, #ffab36, #ff7418 44%, #c65005 100%); }
      .swatch.navy { background: linear-gradient(135deg, #314759, #223546 50%, #0f1720 100%); }
      .swatch.ripstop { background: linear-gradient(135deg, #4c8fd8, #2b68ab 50%, #1c3f62 100%); }

      .feature h3 {
        font-size: 1rem;
        margin-bottom: 8px;
        line-height: 1.15;
      }

      .feature p {
        color: var(--muted);
        font-size: 0.94rem;
        line-height: 1.55;
      }

      .product-preview {
        display: grid;
        grid-template-columns: 1.05fr 0.95fr;
        gap: 18px;
      }

      .preview-pane,
      .preview-detail {
        border: 1px solid var(--line);
        border-radius: 20px;
        background: #fff;
        padding: 20px;
      }

      .preview-shot {
        min-height: 280px;
        border-radius: 16px;
        background: linear-gradient(135deg, #fef95e, #ffab36 44%, #223546 100%);
        position: relative;
        overflow: hidden;
      }

      .preview-shot::after {
        content: "";
        position: absolute;
        inset: 14px;
        border-radius: 14px;
        border: 1px solid rgba(255,255,255,0.35);
      }

      .preview-shot .chip {
        position: absolute;
        left: 18px;
        bottom: 18px;
        padding: 8px 12px;
        border-radius: 999px;
        background: rgba(255,255,255,0.88);
        color: var(--navy);
        font-size: 0.9rem;
        font-weight: 700;
      }

      .preview-detail h3 {
        font-size: 1.08rem;
        margin-bottom: 10px;
      }

      .spec-grid {
        display: grid;
        gap: 10px;
        margin-top: 14px;
      }

      .spec-row {
        display: grid;
        grid-template-columns: 130px minmax(0, 1fr);
        gap: 12px;
        align-items: start;
        padding: 10px 12px;
        border-radius: 14px;
        background: #f8f3ea;
        border: 1px solid rgba(222, 211, 193, 0.7);
      }

      .spec-row strong {
        font-size: 0.9rem;
        color: var(--navy);
      }

      .spec-row span {
        color: var(--muted);
        line-height: 1.55;
      }

      .detail-pills {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        margin-top: 16px;
      }

      .detail-pill {
        padding: 9px 12px;
        border-radius: 999px;
        background: #edf4ff;
        color: #29486a;
        font-size: 0.9rem;
        font-weight: 700;
      }

      .form-status {
        min-height: 0;
        margin-top: 14px;
        border-radius: 18px;
        font-size: 0.95rem;
        font-weight: 700;
        line-height: 1.5;
        color: var(--muted);
      }

      .form-status:not(:empty) {
        padding: 14px 16px;
        border: 1px solid rgba(222, 211, 193, 0.88);
        background: #fffaf1;
      }

      .form-status strong {
        display: block;
        color: var(--navy);
        margin-bottom: 2px;
      }

      .form-status span {
        display: block;
        color: var(--muted);
        font-weight: 650;
      }

      .form-status .status-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
        margin-top: 10px;
      }

      .form-status a {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-height: 36px;
        padding: 8px 14px;
        border-radius: 999px;
        background: var(--accent);
        color: #fff;
        font-weight: 800;
      }

      .form-status a.secondary-action {
        background: #fff;
        color: var(--navy);
        border: 1px solid rgba(222, 211, 193, 0.9);
      }

      .form-status.busy {
        border-color: rgba(248, 132, 24, 0.3);
        background: #fff6e8;
      }

      .form-status.success {
        border-color: rgba(26, 127, 55, 0.2);
        background: #f0fff5;
      }

      .form-status.error {
        border-color: rgba(180, 35, 24, 0.2);
        background: #fff4f2;
      }

      .form-status.success strong { color: #1a7f37; }
      .form-status.error strong { color: #b42318; }

      .gallery-grid {
        display: grid;
        grid-template-columns: 1.15fr 0.85fr;
        gap: 18px;
      }

      .stack {
        display: grid;
        gap: 18px;
      }

      .stack .media-card {
        min-height: 248px;
      }

      .gallery-grid .media-card:first-child {
        min-height: 520px;
      }

      .kpi-grid {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 16px;
      }

      .kpi {
        padding: 16px;
        border-radius: 18px;
        background: #fff;
        border: 1px solid var(--line);
        min-height: 148px;
      }

      .kpi strong {
        display: block;
        font-size: 1rem;
        margin-bottom: 6px;
      }

      .kpi span {
        color: var(--muted);
        font-size: 0.92rem;
        line-height: 1.55;
      }

      .cert-grid {
        display: grid;
        grid-template-columns: 1fr 0.95fr;
        gap: 20px;
      }

      .cert-list {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
      }

      .cert-item {
        padding: 9px 12px;
        border-radius: 999px;
        background: #edf4ff;
        color: #29486a;
        font-size: 0.9rem;
        font-weight: 700;
      }

      .cert-highlight-grid {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 12px;
        margin-top: 18px;
      }

      .cert-highlight {
        padding: 14px;
        border-radius: 16px;
        background: #f8f3ea;
        border: 1px solid rgba(222, 211, 193, 0.78);
        min-height: 152px;
      }

      .cert-highlight strong {
        display: block;
        margin-bottom: 7px;
        color: var(--navy);
        font-size: 0.95rem;
        line-height: 1.2;
      }

      .cert-highlight span {
        color: var(--muted);
        font-size: 0.9rem;
        line-height: 1.52;
      }

      .cert-note {
        margin-top: 16px;
        padding: 14px 16px;
        border-radius: 16px;
        background: #fff8df;
        border: 1px solid rgba(244, 139, 32, 0.22);
        color: #7b4a0b;
        line-height: 1.55;
        font-weight: 650;
      }

      .source-preview-grid {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 12px;
        margin-top: 16px;
      }

      .source-preview {
        overflow: hidden;
        border-radius: 16px;
        border: 1px solid var(--line);
        background: #fff;
      }

      .source-preview img {
        width: 100%;
        aspect-ratio: 4 / 3;
        object-fit: cover;
      }

      .source-preview span {
        display: block;
        padding: 10px 12px;
        color: var(--navy);
        font-size: 0.84rem;
        font-weight: 800;
      }

      .why-grid {
        display: grid;
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: 16px;
      }

      .why-card {
        padding: 18px;
        border-radius: 18px;
        border: 1px solid var(--line);
        background: #fff;
        min-height: 154px;
      }

      .why-card h3 {
        font-size: 1rem;
        margin-bottom: 8px;
      }

      .why-card p {
        color: var(--muted);
        line-height: 1.6;
        font-size: 0.94rem;
      }

      .contact-grid {
        display: grid;
        grid-template-columns: 1.05fr 0.95fr;
        gap: 20px;
      }

      .field-grid {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 12px;
      }

      label {
        display: block;
        font-size: 0.92rem;
        color: var(--muted);
        font-weight: 600;
      }

      input, select, textarea {
        width: 100%;
        margin-top: 8px;
        border-radius: 14px;
        border: 1px solid var(--line);
        background: #fff;
        padding: 13px 14px;
        font: inherit;
        color: var(--ink);
      }

      textarea { min-height: 132px; resize: vertical; }

      .form-grid {
        display: grid;
        gap: 12px;
      }

      .info-list {
        display: grid;
        gap: 16px;
        margin-top: 18px;
      }

      .info-list strong {
        display: block;
        margin-bottom: 5px;
      }

      .info-list span {
        color: var(--muted);
        line-height: 1.6;
      }

      .footer {
        padding: 28px 0 44px;
      }

      .footer-inner {
        display: flex;
        flex-direction: column;
        gap: 18px;
        padding-top: 8px;
      }

      .footer-top {
        display: flex;
        justify-content: space-between;
        gap: 18px;
        align-items: end;
        flex-wrap: wrap;
      }

      .footer-company {
        min-height: 84px;
      }

      .footer-company strong {
        display: block;
        font-size: 1rem;
        margin-bottom: 6px;
      }

      .footer-company span {
        color: var(--muted);
        line-height: 1.5;
        display: block;
      }

      .social-row {
        display: flex;
        flex-wrap: wrap;
        gap: 10px;
      }

      .social-link {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 42px;
        height: 42px;
        border-radius: 999px;
        background: #fff;
        border: 1px solid var(--line);
        color: var(--navy);
        box-shadow: 0 8px 18px rgba(24, 31, 40, 0.05);
      }

      .social-link:hover {
        border-color: var(--accent);
        color: var(--accent-dark);
      }

      .tiny {
        color: var(--muted);
        font-size: 0.92rem;
        line-height: 1.6;
      }

      .mobile-only { display: none; }


      .product-catalog-grid {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 16px;
      }

      .product-catalog-card {
        overflow: hidden;
        border-radius: 18px;
        background: #fff;
        border: 1px solid var(--line);
        box-shadow: 0 10px 26px rgba(24, 31, 40, 0.05);
      }

      .product-catalog-card img {
        width: 100%;
        aspect-ratio: 16 / 11;
        object-fit: cover;
        border-bottom: 1px solid var(--line);
      }

      .product-catalog-card div {
        padding: 16px;
      }

      .product-code {
        display: inline-flex;
        margin-bottom: 10px;
        padding: 7px 10px;
        border-radius: 999px;
        background: #edf4ff;
        color: #29486a;
        font-size: 0.84rem;
        font-weight: 800;
      }

      .product-catalog-card h3 {
        margin-bottom: 8px;
        font-size: 1.06rem;
      }

      .product-catalog-card p {
        color: var(--muted);
        line-height: 1.58;
        font-size: 0.94rem;
      }

      .catalog-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 12px;
        margin-top: 22px;
      }

      @media (max-width: 1060px) {
        .product-catalog-grid {
          grid-template-columns: 1fr 1fr;
        }
      }

      @media (max-width: 680px) {
        .product-catalog-grid {
          grid-template-columns: 1fr;
        }
      }

      @media (max-width: 1060px) {
        .hero-grid,
        .split-grid,
        .product-preview,
        .gallery-grid,
        .cert-grid,
        .cert-highlight-grid,
        .source-preview-grid,
        .contact-grid,
        .feature-grid,
        .why-grid,
        .kpi-grid {
          grid-template-columns: 1fr 1fr;
        }

        .site-header-inner {
          display: block;
          padding: 16px 0;
        }

        .nav {
          margin-top: 14px;
          justify-content: flex-start;
        }

        .nav-panel {
          left: 0;
        }

        .hero-media {
          min-height: 480px;
        }
      }

      @media (max-width: 760px) {
        .shell,
        .site-header-inner {
          width: min(var(--max), calc(100% - 24px));
        }

        .hero,
        section.block {
          padding-top: 28px;
          padding-bottom: 28px;
        }

        .hero-copy,
        .section-card,
        .copy-card,
        .contact-card {
          padding: 22px;
        }

        h1 { font-size: 2rem; max-width: none; }

        .hero-grid,
        .split-grid,
        .product-preview,
        .gallery-grid,
        .cert-grid,
        .contact-grid,
        .feature-grid,
        .why-grid,
        .kpi-grid,
        .field-grid {
          grid-template-columns: 1fr;
        }

        .hero-media {
          min-height: 380px;
        }

        .mobile-only { display: inline; }
      }

      @media (max-width: 760px) {
        body { overflow-x: hidden; }

        .site-header { position: relative; }

        .site-header-inner {
          display: grid;
          gap: 12px;
          padding: 14px 0;
          min-height: auto;
        }

        .brand { align-items: flex-start; }

        .brand-copy strong {
          font-size: 0.98rem;
          line-height: 1.25;
        }

        .brand-copy span {
          font-size: 0.82rem;
          line-height: 1.35;
        }

        .nav {
          width: 100%;
          display: flex;
          flex-wrap: wrap;
          gap: 10px;
          overflow-x: visible;
          overflow-y: visible;
          padding: 2px 0 4px;
          justify-content: flex-start;
          scrollbar-width: none;
          -webkit-overflow-scrolling: touch;
          align-items: center;
        }

        .nav::-webkit-scrollbar { display: none; }

        .nav > a,
        .nav summary,
        .quote-link,
        .lang-toggle {
          flex: 0 0 auto;
          display: inline-flex;
          align-items: center;
          justify-content: center;
          white-space: nowrap;
          height: 40px;
          min-height: 40px;
          padding: 0 13px;
          border-radius: 999px;
          background: rgba(255, 255, 255, 0.72);
          border: 1px solid rgba(222, 211, 193, 0.88);
          box-sizing: border-box;
          line-height: 1;
        }

        .quote-link {
          background: var(--accent);
          color: #fff;
        }

        details.nav-menu {
          flex: 0 0 auto;
          position: static;
        }

        details.nav-menu[open] > summary {
          color: var(--ink);
          background: #fff7ec;
          border-color: rgba(255, 139, 24, 0.45);
        }

        .nav-panel,
        .product-nav-panel {
          position: fixed;
          top: 132px;
          left: 16px;
          right: 16px;
          width: auto;
          min-width: 0;
          max-width: none;
          max-height: min(58vh, 460px);
          overflow-y: auto;
          z-index: 120;
          border-radius: 20px;
        }

        .hero-copy h1,
        body[data-lang="zh"] .hero-copy h1 {
          min-height: 0;
          max-width: 100%;
          font-size: clamp(1.78rem, 9vw, 2.35rem);
          line-height: 1.06;
        }

        body[data-lang="zh"] .hero-copy h1 {
          font-size: clamp(1.58rem, 7.6vw, 2.08rem);
        }

        .lede {
          font-size: 0.96rem;
          line-height: 1.66;
        }

        .button {
          width: 100%;
          min-height: 46px;
        }

        .hero-metrics,
        .cert-highlight-grid,
        .source-preview-grid,
        .why-grid,
        .kpi-grid {
          grid-template-columns: 1fr;
        }

        .metric,
        .cert-highlight,
        .why-card,
        .kpi {
          min-height: auto;
        }

        .hero-media,
        .gallery-grid .media-card:first-child,
        .stack .media-card {
          min-height: auto;
        }

        .hero-media img,
        .media-card img,
        .about-photo img {
          height: auto;
          aspect-ratio: 4 / 3;
          object-fit: cover;
        }

        .hero-note {
          position: static;
          margin: 12px;
          border-radius: 16px;
        }

        .section-head {
          display: grid;
          align-items: start;
          gap: 14px;
        }

        .section-head h1,
        .section-head h2,
        body[data-lang="zh"] .section-head h1,
        body[data-lang="zh"] .section-head h2 {
          min-height: 0;
          max-width: 100%;
          font-size: clamp(1.42rem, 7vw, 1.9rem);
          line-height: 1.12;
        }

        .about-grid,
        .feature-grid,
        .cert-highlight-grid,
        .source-preview-grid {
          grid-template-columns: 1fr;
        }

        .feature .swatch { aspect-ratio: 16 / 9; }

        .product-preview,
        .cert-grid,
        .contact-grid {
          gap: 14px;
        }

        .preview-pane,
        .preview-detail,
        .copy-card,
        .contact-card {
          padding: 18px;
          border-radius: 18px;
        }

        .preview-shot { min-height: 210px; }

        .spec-row {
          grid-template-columns: 1fr;
          gap: 5px;
        }

        .cert-list,
        .pill-row,
        .detail-pills {
          gap: 8px;
        }

        .cert-item,
        .pill,
        .detail-pill {
          font-size: 0.84rem;
          padding: 8px 10px;
        }

        .field-grid { gap: 10px; }

        input,
        select,
        textarea {
          font-size: 16px;
        }

        .footer-top { align-items: start; }
      }

      @media (max-width: 420px) {
        .shell,
        .site-header-inner {
          width: min(var(--max), calc(100% - 18px));
        }

        .hero-copy,
        .section-card,
        .copy-card,
        .contact-card {
          padding: 18px;
          border-radius: 22px;
        }

        .brand-copy strong { font-size: 0.92rem; }
        .brand-copy span { display: none; }

        .hero-actions,
        .catalog-actions {
          gap: 10px;
        }
      }