/* ============================================================
   m20 · Precision Instruments — 精密仪器
   Medical / lab / measurement device aesthetic
   Ultra-thin hairlines · calibrated tick marks · tabular nums
   Sterile whitespace · medical red for critical CTAs only
   ============================================================ */

:root {
    --m20-bg: #ffffff;
    --m20-bg-2: #f8fafc;
    --m20-card: #ffffff;
    --m20-ink: #1e293b;
    --m20-ink-2: #475569;
    --m20-ink-3: #94a3b8;
    --m20-line: #cbd5e1;
    --m20-line-soft: #e2e8f0;
    --m20-chrome: #94a3b8;
    --m20-chrome-2: #64748b;
    --m20-red: #dc2626;
    --m20-red-soft: #fef2f2;
    --m20-tick: #cbd5e1;
    --m20-grid: rgba(148, 163, 184, 0.08);

    --m20-display: 'Saira', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    --m20-body: 'Cabin', 'PingFang SC', 'Microsoft YaHei', sans-serif;

    --m20-shell: 1240px;
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
    background: var(--m20-bg);
    color: var(--m20-ink);
    font-family: var(--m20-body);
    font-size: 15px;
    line-height: 1.6;
    font-weight: 400;
    font-feature-settings: "tnum" 1, "lnum" 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* SEO hidden h1 */
.seo-h1 {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.m20-shell {
    max-width: var(--m20-shell);
    margin: 0 auto;
    padding: 0 32px;
}

/* tabular numerics util */
.m20-num { font-variant-numeric: tabular-nums; letter-spacing: 0.02em; }

/* ── Trust strip (top measurement bar) ────────────────────── */
.m20-trust {
    background: var(--m20-bg-2);
    border-bottom: 1px solid var(--m20-line);
    font-family: var(--m20-display);
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--m20-ink-2);
}
.m20-trust-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 36px;
    gap: 24px;
}
.m20-trust-left, .m20-trust-right {
    display: flex;
    align-items: center;
    gap: 24px;
}
.m20-trust-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    position: relative;
}
.m20-trust-item::before {
    content: '';
    width: 6px;
    height: 6px;
    border: 1px solid var(--m20-chrome-2);
    background: var(--m20-bg);
    display: inline-block;
}
.m20-trust-item.is-active::before {
    background: var(--m20-red);
    border-color: var(--m20-red);
}
.m20-trust a { color: var(--m20-ink-2); transition: color .2s; }
.m20-trust a:hover { color: var(--m20-red); }
.m20-trust .sep {
    width: 1px; height: 12px; background: var(--m20-line);
}

/* ── Header / masthead ────────────────────────────────────── */
.m20-mast {
    background: var(--m20-bg);
    border-bottom: 1px solid var(--m20-line);
    position: relative;
}
.m20-mast::after {
    /* Calibrated tick mark strip below header */
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0; right: 0;
    height: 6px;
    background-image: repeating-linear-gradient(
        to right,
        var(--m20-line) 0,
        var(--m20-line) 1px,
        transparent 1px,
        transparent 20px
    );
    pointer-events: none;
}
.m20-mast-row {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 32px;
    padding: 24px 0;
}
.m20-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}
.m20-brand-logo {
    width: 56px;
    height: 56px;
    object-fit: contain;
    border: 1px solid var(--m20-line);
    background: var(--m20-bg-2);
    padding: 4px;
}
.m20-brand-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.m20-brand-text .h1 {
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 20px;
    color: var(--m20-ink);
    letter-spacing: 0.02em;
    line-height: 1.2;
}
.m20-brand-text p {
    margin: 0;
    font-size: 12px;
    color: var(--m20-ink-2);
    letter-spacing: 0.04em;
}

.m20-mast-cta {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 20px;
    border: 1px solid var(--m20-line);
    background: var(--m20-bg-2);
    position: relative;
}
.m20-mast-cta::before {
    content: '';
    position: absolute;
    top: 50%;
    left: -1px;
    width: 4px;
    height: 60%;
    background: var(--m20-red);
    transform: translateY(-50%);
}
.m20-mast-cta .label {
    font-family: var(--m20-display);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--m20-ink-3);
    line-height: 1.2;
    display: block;
}
.m20-mast-cta .num {
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 19px;
    color: var(--m20-ink);
    letter-spacing: 0.04em;
    font-variant-numeric: tabular-nums;
    line-height: 1.2;
    display: block;
    margin-top: 2px;
}

/* ── Nav ──────────────────────────────────────────────────── */
.m20-nav {
    background: var(--m20-bg);
    border-bottom: 1px solid var(--m20-line);
}
.m20-nav-inner {
    display: flex;
    align-items: center;
    gap: 0;
}
.m20-nav-inner a {
    position: relative;
    padding: 18px 24px;
    font-family: var(--m20-display);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--m20-ink-2);
    transition: color .2s;
    border-right: 1px solid var(--m20-line-soft);
}
.m20-nav-inner a:first-child { border-left: 1px solid var(--m20-line-soft); }
.m20-nav-inner a:hover { color: var(--m20-red); }
.m20-nav-inner a.is-active {
    color: var(--m20-ink);
    background: var(--m20-bg-2);
}
.m20-nav-inner a.is-active::after {
    content: '';
    position: absolute;
    left: 0; right: 0; bottom: -1px;
    height: 2px;
    background: var(--m20-red);
}

/* ── Section primitive ───────────────────────────────────── */
.m20-section { padding: 80px 0; }
.m20-section-sm { padding: 40px 0; }
.m20-section-h {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--m20-line);
    padding-bottom: 16px;
    position: relative;
}
.m20-section-h::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 60px;
    height: 2px;
    background: var(--m20-red);
}
.m20-section-h h2 {
    margin: 0;
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 28px;
    color: var(--m20-ink);
    letter-spacing: 0.02em;
    line-height: 1.2;
}
.m20-section-h h2 small {
    display: block;
    font-family: var(--m20-display);
    font-weight: 500;
    font-size: 11px;
    color: var(--m20-ink-3);
    letter-spacing: 0.24em;
    text-transform: uppercase;
    margin-top: 6px;
}
.m20-section-h .more {
    font-family: var(--m20-display);
    font-size: 12px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--m20-ink-2);
    border-bottom: 1px solid var(--m20-line);
    padding-bottom: 4px;
    transition: all .2s;
}
.m20-section-h .more:hover {
    color: var(--m20-red);
    border-color: var(--m20-red);
}

/* ── Hero (homepage) ─────────────────────────────────────── */
.m20-hero {
    background: var(--m20-bg);
    padding: 64px 0 48px;
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid var(--m20-line);
}
.m20-hero::before {
    /* Grid underlay */
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(to right, var(--m20-grid) 1px, transparent 1px),
        linear-gradient(to bottom, var(--m20-grid) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
}
.m20-hero-inner {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}
.m20-hero-meta {
    font-family: var(--m20-display);
    font-size: 11px;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: var(--m20-ink-3);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.m20-hero-meta .dash {
    flex: 0 0 32px;
    height: 1px;
    background: var(--m20-red);
}
.m20-hero h1 {
    margin: 0 0 24px;
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 48px;
    line-height: 1.15;
    color: var(--m20-ink);
    letter-spacing: -0.01em;
}
.m20-hero h1 em {
    font-style: normal;
    color: var(--m20-red);
    border-bottom: 2px solid var(--m20-red);
    padding-bottom: 2px;
}
.m20-hero .lead {
    font-size: 16px;
    line-height: 1.7;
    color: var(--m20-ink-2);
    margin: 0 0 32px;
    max-width: 540px;
}

/* spec-readout panel */
.m20-readout {
    border: 1px solid var(--m20-line);
    background: var(--m20-bg-2);
    padding: 24px 28px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    position: relative;
}
.m20-readout::before, .m20-readout::after {
    content: '';
    position: absolute;
    width: 8px;
    height: 8px;
    border: 1px solid var(--m20-chrome-2);
    background: var(--m20-bg);
}
.m20-readout::before { top: -4px; left: -4px; }
.m20-readout::after { bottom: -4px; right: -4px; }
.m20-readout .cell {
    border-left: 1px solid var(--m20-line);
    padding-left: 16px;
}
.m20-readout .cell:first-child { border-left: 0; padding-left: 0; }
.m20-readout .cell .label {
    font-family: var(--m20-display);
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--m20-ink-3);
    margin-bottom: 6px;
}
.m20-readout .cell .val {
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 22px;
    color: var(--m20-ink);
    line-height: 1.1;
    font-variant-numeric: tabular-nums;
}
.m20-readout .cell .unit {
    font-family: var(--m20-display);
    font-weight: 400;
    font-size: 11px;
    color: var(--m20-ink-3);
    letter-spacing: 0.16em;
    text-transform: uppercase;
    margin-left: 4px;
}

/* hero image with calibration frame */
.m20-hero-img {
    position: relative;
    aspect-ratio: 4 / 3;
    background: var(--m20-bg-2);
    border: 1px solid var(--m20-line);
    overflow: hidden;
}
.m20-hero-img::before {
    content: '';
    position: absolute;
    inset: 12px;
    border: 1px dashed var(--m20-chrome);
    pointer-events: none;
    z-index: 2;
}
.m20-hero-img::after {
    content: 'CAL · 01';
    position: absolute;
    top: 18px;
    right: 18px;
    z-index: 3;
    font-family: var(--m20-display);
    font-size: 10px;
    letter-spacing: 0.2em;
    color: var(--m20-red);
    background: var(--m20-bg);
    padding: 2px 8px;
    border: 1px solid var(--m20-red);
}
.m20-hero-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: relative;
    z-index: 1;
}

/* ── Buttons ─────────────────────────────────────────────── */
.m20-cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}
.m20-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 13px 22px;
    font-family: var(--m20-display);
    font-size: 13px;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    border: 1px solid var(--m20-ink);
    background: var(--m20-ink);
    color: var(--m20-bg);
    transition: all .2s;
    line-height: 1;
    cursor: pointer;
}
.m20-btn:hover { background: var(--m20-bg); color: var(--m20-ink); }
.m20-btn-primary {
    background: var(--m20-red);
    border-color: var(--m20-red);
    color: var(--m20-bg);
}
.m20-btn-primary:hover {
    background: var(--m20-bg);
    color: var(--m20-red);
}
.m20-btn-outline {
    background: transparent;
    border: 1px solid var(--m20-line);
    color: var(--m20-ink);
}
.m20-btn-outline:hover {
    border-color: var(--m20-ink);
    background: var(--m20-bg-2);
}
.m20-btn .arr { font-size: 16px; line-height: 1; }

/* ── Category quick-pills ────────────────────────────────── */
.m20-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 40px;
}
.m20-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border: 1px solid var(--m20-line);
    background: var(--m20-bg);
    font-family: var(--m20-display);
    font-size: 12px;
    letter-spacing: 0.06em;
    color: var(--m20-ink-2);
    transition: all .2s;
}
.m20-pill::before {
    content: '';
    width: 6px;
    height: 6px;
    border: 1px solid var(--m20-chrome-2);
    background: var(--m20-bg);
}
.m20-pill:hover {
    border-color: var(--m20-red);
    color: var(--m20-red);
}
.m20-pill:hover::before {
    background: var(--m20-red);
    border-color: var(--m20-red);
}
.m20-pill.is-active {
    background: var(--m20-ink);
    border-color: var(--m20-ink);
    color: var(--m20-bg);
}
.m20-pill.is-active::before {
    background: var(--m20-red);
    border-color: var(--m20-red);
}

/* ── Featured product cards (productToplist) ─────────────── */
.m20-feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.m20-feature {
    border: 1px solid var(--m20-line);
    background: var(--m20-card);
    display: flex;
    flex-direction: column;
    position: relative;
    transition: all .2s;
}
.m20-feature::before {
    /* tick marks across the top */
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background-image: repeating-linear-gradient(
        to right,
        var(--m20-line) 0, var(--m20-line) 1px,
        transparent 1px, transparent 8px
    );
}
.m20-feature:hover {
    border-color: var(--m20-ink);
    transform: translateY(-2px);
}
.m20-feature-img {
    aspect-ratio: 4 / 3;
    background: var(--m20-bg-2);
    overflow: hidden;
    position: relative;
    border-bottom: 1px solid var(--m20-line);
}
.m20-feature-img img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform .4s;
}
.m20-feature:hover .m20-feature-img img { transform: scale(1.04); }
.m20-feature-tag {
    position: absolute;
    top: 12px;
    left: 12px;
    font-family: var(--m20-display);
    font-size: 10px;
    font-weight: 500;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    background: var(--m20-bg);
    border: 1px solid var(--m20-red);
    color: var(--m20-red);
    padding: 3px 8px;
}
.m20-feature-body {
    padding: 20px 22px 22px;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.m20-feature-spec {
    display: flex;
    gap: 12px;
    margin-bottom: 10px;
    font-family: var(--m20-display);
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--m20-ink-3);
}
.m20-feature-spec span {
    display: inline-flex;
    gap: 6px;
}
.m20-feature-spec b {
    font-weight: 500;
    color: var(--m20-ink-2);
    font-variant-numeric: tabular-nums;
}
.m20-feature-title {
    margin: 0 0 14px;
    font-family: var(--m20-display);
    font-weight: 500;
    font-size: 16px;
    line-height: 1.4;
    color: var(--m20-ink);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 44px;
}
.m20-feature-row {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 12px;
    padding-top: 14px;
    border-top: 1px dashed var(--m20-line);
    margin-top: auto;
}
.m20-feature-price {
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 20px;
    color: var(--m20-ink);
    line-height: 1.2;
    font-variant-numeric: tabular-nums;
}
.m20-feature-price small {
    font-size: 11px;
    font-weight: 400;
    color: var(--m20-ink-3);
    letter-spacing: 0.1em;
    margin-left: 4px;
    text-transform: uppercase;
}
.m20-feature-moq {
    font-family: var(--m20-display);
    font-size: 10px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--m20-ink-3);
    line-height: 1.2;
}
.m20-feature-moq b {
    display: block;
    font-weight: 500;
    color: var(--m20-ink);
    font-size: 13px;
    letter-spacing: 0.04em;
    margin-top: 2px;
    font-variant-numeric: tabular-nums;
    text-transform: none;
}
.m20-feature-cta {
    display: block;
    text-align: center;
    margin-top: 14px;
    padding: 11px 16px;
    background: var(--m20-bg-2);
    border: 1px solid var(--m20-line);
    color: var(--m20-ink);
    font-family: var(--m20-display);
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    transition: all .2s;
}
.m20-feature:hover .m20-feature-cta {
    background: var(--m20-red);
    border-color: var(--m20-red);
    color: var(--m20-bg);
}

/* ── Secondary denser grid (productlist) ─────────────────── */
.m20-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.m20-card {
    border: 1px solid var(--m20-line);
    background: var(--m20-card);
    transition: all .2s;
    display: flex;
    flex-direction: column;
}
.m20-card:hover {
    border-color: var(--m20-ink);
}
.m20-card-img {
    aspect-ratio: 1 / 1;
    background: var(--m20-bg-2);
    overflow: hidden;
    border-bottom: 1px solid var(--m20-line);
}
.m20-card-img img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform .4s;
}
.m20-card:hover .m20-card-img img { transform: scale(1.04); }
.m20-card-body {
    padding: 12px 14px 14px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.m20-card-title {
    margin: 0;
    font-size: 13px;
    line-height: 1.4;
    color: var(--m20-ink);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    min-height: 36px;
}
.m20-card-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
    padding-top: 8px;
    border-top: 1px dashed var(--m20-line-soft);
}
.m20-card-price {
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 14px;
    color: var(--m20-red);
    font-variant-numeric: tabular-nums;
}
.m20-card-tag {
    font-family: var(--m20-display);
    font-size: 9px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--m20-ink-3);
    border: 1px solid var(--m20-line);
    padding: 2px 6px;
}

/* ── About excerpt ──────────────────────────────────────── */
.m20-about {
    background: var(--m20-bg-2);
    border-top: 1px solid var(--m20-line);
    border-bottom: 1px solid var(--m20-line);
}
.m20-about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 56px;
    align-items: center;
}
.m20-about-img {
    border: 1px solid var(--m20-line);
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background: var(--m20-bg);
    position: relative;
}
.m20-about-img::after {
    content: 'SPECIMEN';
    position: absolute;
    bottom: 14px;
    left: 14px;
    z-index: 2;
    font-family: var(--m20-display);
    font-size: 10px;
    letter-spacing: 0.24em;
    background: var(--m20-bg);
    padding: 4px 8px;
    border: 1px solid var(--m20-line);
    color: var(--m20-ink-2);
}
.m20-about-img img { width: 100%; height: 100%; object-fit: cover; }

/* ── Inquiry CTA strip ──────────────────────────────────── */
.m20-cta-strip {
    background: var(--m20-ink);
    color: var(--m20-bg);
    padding: 36px 0;
    position: relative;
    overflow: hidden;
}
.m20-cta-strip::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background-image: repeating-linear-gradient(
        to right,
        var(--m20-red) 0, var(--m20-red) 1px,
        transparent 1px, transparent 16px
    );
}
.m20-cta-strip-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 24px;
    align-items: center;
}
.m20-cta-strip h3 {
    margin: 0 0 6px;
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 22px;
    letter-spacing: 0.02em;
}
.m20-cta-strip p {
    margin: 0;
    font-size: 13px;
    color: rgba(255,255,255,0.66);
    letter-spacing: 0.04em;
}
.m20-cta-strip-tel {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
}
.m20-cta-strip-tel small {
    font-family: var(--m20-display);
    font-size: 10px;
    letter-spacing: 0.24em;
    text-transform: uppercase;
    color: rgba(255,255,255,0.5);
}
.m20-cta-strip-tel strong {
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 28px;
    letter-spacing: 0.04em;
    color: var(--m20-bg);
    font-variant-numeric: tabular-nums;
}

/* ── Layout (with sidebar) ──────────────────────────────── */
.m20-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 40px;
    align-items: flex-start;
}
.m20-side-card {
    border: 1px solid var(--m20-line);
    background: var(--m20-card);
    margin-bottom: 16px;
    position: relative;
}
.m20-side-card::before {
    content: '';
    position: absolute;
    top: 16px; left: -1px;
    width: 4px; height: 16px;
    background: var(--m20-red);
}
.m20-side-card h3 {
    margin: 0;
    padding: 16px 20px 14px;
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 13px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--m20-ink);
    border-bottom: 1px solid var(--m20-line);
}
.m20-side-list {
    list-style: none;
    margin: 0;
    padding: 0;
}
.m20-side-list li { border-bottom: 1px solid var(--m20-line-soft); }
.m20-side-list li:last-child { border-bottom: 0; }
.m20-side-list a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 11px 20px;
    font-size: 13px;
    color: var(--m20-ink-2);
    transition: all .2s;
}
.m20-side-list a::before {
    content: '·';
    color: var(--m20-chrome);
    margin-right: 8px;
    font-size: 18px;
    line-height: 1;
}
.m20-side-list a:hover {
    color: var(--m20-red);
    background: var(--m20-bg-2);
}
.m20-side-card-body { padding: 16px 20px 20px; }

/* ── Breadcrumb ─────────────────────────────────────────── */
.m20-crumb {
    background: var(--m20-bg-2);
    border-bottom: 1px solid var(--m20-line);
    padding: 14px 0;
    font-family: var(--m20-display);
    font-size: 11px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--m20-ink-3);
}
.m20-crumb a { color: var(--m20-ink-2); transition: color .2s; }
.m20-crumb a:hover { color: var(--m20-red); }
.m20-crumb .sep { margin: 0 10px; color: var(--m20-line); }

/* ── Product detail layout ───────────────────────────────── */
.m20-prod-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
}
.m20-prod-img {
    position: relative;
    border: 1px solid var(--m20-line);
    background: var(--m20-bg-2);
    aspect-ratio: 1 / 1;
    overflow: hidden;
}
.m20-prod-img::before {
    content: '';
    position: absolute;
    inset: 16px;
    border: 1px dashed var(--m20-chrome);
    pointer-events: none;
    z-index: 2;
}
.m20-prod-img::after {
    content: '';
    position: absolute;
    top: 8px; right: 8px;
    width: 20px; height: 20px;
    border-top: 2px solid var(--m20-red);
    border-right: 2px solid var(--m20-red);
    z-index: 3;
}
.m20-prod-img img {
    width: 100%; height: 100%;
    object-fit: contain;
    padding: 36px;
}
.m20-prod-info h1 {
    margin: 0 0 16px;
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 30px;
    line-height: 1.3;
    color: var(--m20-ink);
    letter-spacing: -0.005em;
}
.m20-prod-meta-tags {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.m20-prod-meta-tags span {
    font-family: var(--m20-display);
    font-size: 10px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--m20-ink-2);
    border: 1px solid var(--m20-line);
    background: var(--m20-bg-2);
    padding: 4px 10px;
}
.m20-prod-price-box {
    border: 1px solid var(--m20-line);
    background: var(--m20-bg-2);
    padding: 20px 24px;
    margin: 0 0 24px;
    position: relative;
}
.m20-prod-price-box::before {
    content: 'PRICE / 报价';
    position: absolute;
    top: -8px;
    left: 16px;
    font-family: var(--m20-display);
    font-size: 9px;
    letter-spacing: 0.24em;
    background: var(--m20-bg);
    padding: 2px 8px;
    color: var(--m20-ink-3);
    border: 1px solid var(--m20-line);
}
.m20-prod-price {
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 36px;
    color: var(--m20-red);
    line-height: 1.1;
    font-variant-numeric: tabular-nums;
}
.m20-prod-price small {
    font-size: 13px;
    font-weight: 400;
    color: var(--m20-ink-3);
    margin-left: 8px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.m20-prod-attrs {
    margin: 0 0 28px;
    border: 1px solid var(--m20-line);
    background: var(--m20-card);
    overflow: hidden;
}
.m20-prod-attrs dl {
    margin: 0;
    display: grid;
    grid-template-columns: 110px 1fr;
}
.m20-prod-attrs dt {
    padding: 12px 18px;
    font-family: var(--m20-display);
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--m20-ink-2);
    background: var(--m20-bg-2);
    border-right: 1px solid var(--m20-line);
    border-bottom: 1px solid var(--m20-line-soft);
}
.m20-prod-attrs dd {
    margin: 0;
    padding: 12px 18px;
    font-size: 13px;
    color: var(--m20-ink);
    border-bottom: 1px solid var(--m20-line-soft);
}
.m20-prod-attrs dt:nth-last-of-type(1),
.m20-prod-attrs dd:nth-last-of-type(1) { border-bottom: 0; }

/* ── Prose (long-form / about / news content) ───────────── */
.m20-prose {
    max-width: 800px;
    margin: 0 auto;
    font-size: 15px;
    line-height: 1.85;
    color: var(--m20-ink);
}
.m20-prose p { margin: 0 0 1.2em; }
.m20-prose h2, .m20-prose h3 {
    font-family: var(--m20-display);
    font-weight: 700;
    color: var(--m20-ink);
    margin: 1.6em 0 0.6em;
    letter-spacing: 0.01em;
}
.m20-prose h2 {
    font-size: 22px;
    border-bottom: 1px solid var(--m20-line);
    padding-bottom: 8px;
}
.m20-prose h3 { font-size: 17px; }
.m20-prose img { margin: 1.2em auto; border: 1px solid var(--m20-line); }
.m20-prose a { color: var(--m20-red); border-bottom: 1px solid currentColor; }
.m20-prose ul, .m20-prose ol { padding-left: 24px; margin: 1em 0; }
.m20-prose li { margin: 0.4em 0; }
.m20-prose strong { color: var(--m20-ink); }
.m20-prose blockquote {
    margin: 1.4em 0;
    padding: 12px 20px;
    border-left: 3px solid var(--m20-red);
    background: var(--m20-bg-2);
    color: var(--m20-ink-2);
}

/* ── News list ──────────────────────────────────────────── */
.m20-news-list {
    list-style: none;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--m20-line);
}
.m20-news-list li {
    border-bottom: 1px solid var(--m20-line);
    padding: 24px 0;
    display: grid;
    grid-template-columns: 96px 1fr auto;
    gap: 24px;
    align-items: center;
    transition: background .2s;
}
.m20-news-list li:hover { background: var(--m20-bg-2); padding-left: 16px; padding-right: 16px; }
.m20-news-list .date {
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--m20-red);
    text-align: center;
    padding: 8px 0;
    border: 1px solid var(--m20-line);
    background: var(--m20-bg);
    line-height: 1.3;
    font-variant-numeric: tabular-nums;
}
.m20-news-list .date b {
    display: block;
    font-size: 22px;
    color: var(--m20-ink);
    letter-spacing: 0;
    margin-top: 2px;
}
.m20-news-list .body a {
    display: block;
    font-family: var(--m20-display);
    font-weight: 500;
    font-size: 17px;
    color: var(--m20-ink);
    line-height: 1.4;
    margin-bottom: 6px;
    transition: color .2s;
}
.m20-news-list .body a:hover { color: var(--m20-red); }
.m20-news-list .body p {
    margin: 0;
    font-size: 13px;
    color: var(--m20-ink-2);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.m20-news-list .arr {
    font-family: var(--m20-display);
    font-size: 22px;
    color: var(--m20-line);
    transition: color .2s;
}
.m20-news-list li:hover .arr { color: var(--m20-red); }

/* ── Contact ────────────────────────────────────────────── */
.m20-contact-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 48px;
    align-items: flex-start;
}
.m20-contact-card {
    border: 1px solid var(--m20-line);
    background: var(--m20-card);
    padding: 32px;
    position: relative;
}
.m20-contact-card::before {
    content: 'CONTACT / 联系信息';
    position: absolute;
    top: -10px;
    left: 24px;
    font-family: var(--m20-display);
    font-size: 10px;
    letter-spacing: 0.24em;
    background: var(--m20-bg);
    padding: 2px 10px;
    color: var(--m20-ink-3);
    border: 1px solid var(--m20-line);
}
.m20-contact-card dl {
    margin: 0;
    display: grid;
    grid-template-columns: 96px 1fr;
    gap: 0;
}
.m20-contact-card dt {
    font-family: var(--m20-display);
    font-size: 11px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--m20-ink-3);
    padding: 14px 0;
    border-bottom: 1px solid var(--m20-line-soft);
}
.m20-contact-card dd {
    margin: 0;
    padding: 14px 0;
    font-size: 14px;
    color: var(--m20-ink);
    border-bottom: 1px solid var(--m20-line-soft);
}
.m20-contact-card dd a { color: var(--m20-red); }
.m20-contact-qr {
    border: 1px solid var(--m20-line);
    background: var(--m20-bg);
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px;
    position: relative;
}
.m20-contact-qr::before {
    content: 'WECHAT QR';
    position: absolute;
    top: -10px;
    left: 24px;
    font-family: var(--m20-display);
    font-size: 10px;
    letter-spacing: 0.24em;
    background: var(--m20-bg);
    padding: 2px 10px;
    color: var(--m20-ink-3);
    border: 1px solid var(--m20-line);
}
.m20-contact-qr img { width: 100%; height: 100%; object-fit: contain; }
.m20-contact-empty {
    color: var(--m20-ink-3);
    font-size: 12px;
    letter-spacing: 0.1em;
    text-align: center;
    text-transform: uppercase;
}

/* ── Pager ──────────────────────────────────────────────── */
.m20-pager {
    margin-top: 40px;
    text-align: center;
    font-family: var(--m20-display);
}
.m20-pager .pagination {
    display: inline-flex;
    gap: 0;
    list-style: none;
    margin: 0;
    padding: 0;
    border: 1px solid var(--m20-line);
}
.m20-pager .pagination li {
    border-right: 1px solid var(--m20-line-soft);
}
.m20-pager .pagination li:last-child { border-right: 0; }
.m20-pager .pagination a,
.m20-pager .pagination span {
    display: block;
    padding: 10px 16px;
    font-size: 13px;
    color: var(--m20-ink-2);
    font-variant-numeric: tabular-nums;
    letter-spacing: 0.06em;
    transition: all .2s;
}
.m20-pager .pagination a:hover { background: var(--m20-bg-2); color: var(--m20-red); }
.m20-pager .pagination .active span,
.m20-pager .pagination .current {
    background: var(--m20-red);
    color: var(--m20-bg);
    font-weight: 700;
}

/* ── Footer ─────────────────────────────────────────────── */
.m20-footer {
    background: var(--m20-bg-2);
    border-top: 1px solid var(--m20-line);
    padding: 32px 0 24px;
    margin-top: 40px;
}
.m20-footer-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}
.m20-footer p {
    margin: 0;
    font-size: 12px;
    color: var(--m20-ink-2);
    letter-spacing: 0.04em;
}
.m20-footer .links {
    display: flex;
    gap: 0;
    font-family: var(--m20-display);
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}
.m20-footer .links a {
    padding: 0 14px;
    color: var(--m20-ink-2);
    border-right: 1px solid var(--m20-line);
    transition: color .2s;
}
.m20-footer .links a:last-child { border-right: 0; padding-right: 0; }
.m20-footer .links a:first-child { padding-left: 0; }
.m20-footer .links a:hover { color: var(--m20-red); }

/* ── Sitemap ────────────────────────────────────────────── */
.m20-sitemap-block {
    border: 1px solid var(--m20-line);
    background: var(--m20-card);
    margin-bottom: 24px;
}
.m20-sitemap-block h3 {
    margin: 0;
    padding: 14px 20px;
    font-family: var(--m20-display);
    font-weight: 700;
    font-size: 12px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--m20-ink);
    border-bottom: 1px solid var(--m20-line);
    background: var(--m20-bg-2);
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.m20-sitemap-block h3 small {
    font-family: var(--m20-display);
    font-weight: 500;
    font-size: 11px;
    color: var(--m20-ink-3);
    letter-spacing: 0.14em;
    font-variant-numeric: tabular-nums;
}
.m20-sitemap-list {
    list-style: none;
    margin: 0;
    padding: 16px 20px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0;
}
.m20-sitemap-list-2 { grid-template-columns: repeat(2, 1fr); }
.m20-sitemap-list li {
    border-bottom: 1px dashed var(--m20-line-soft);
}
.m20-sitemap-list a {
    display: block;
    padding: 8px 0;
    font-size: 13px;
    color: var(--m20-ink-2);
    transition: color .2s;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.m20-sitemap-list a::before {
    content: '› ';
    color: var(--m20-chrome);
    margin-right: 4px;
}
.m20-sitemap-list a:hover { color: var(--m20-red); }

/* ── Empty state ────────────────────────────────────────── */
.m20-empty {
    padding: 80px 0;
    text-align: center;
    color: var(--m20-ink-3);
}
.m20-empty p {
    font-family: var(--m20-display);
    font-size: 13px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    margin: 0;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 1024px) {
    .m20-shell { padding: 0 24px; }
    .m20-hero h1 { font-size: 38px; }
    .m20-hero-inner { grid-template-columns: 1fr; gap: 32px; }
    .m20-feature-grid { grid-template-columns: repeat(2, 1fr); }
    .m20-grid { grid-template-columns: repeat(3, 1fr); }
    .m20-layout { grid-template-columns: 1fr; gap: 24px; }
    .m20-prod-grid { grid-template-columns: 1fr; gap: 32px; }
    .m20-about-grid { grid-template-columns: 1fr; gap: 32px; }
    .m20-contact-grid { grid-template-columns: 1fr; gap: 32px; }
    .m20-mast-row { grid-template-columns: 1fr; gap: 16px; }
    .m20-mast-cta { width: 100%; justify-content: space-between; }
    .m20-nav-inner { overflow-x: auto; flex-wrap: nowrap; }
    .m20-nav-inner a { padding: 16px 16px; font-size: 12px; flex: 0 0 auto; }
    .m20-section { padding: 56px 0; }
    .m20-readout { grid-template-columns: 1fr; gap: 12px; }
    .m20-readout .cell { border-left: 0; padding-left: 0; border-top: 1px solid var(--m20-line); padding-top: 12px; }
    .m20-readout .cell:first-child { border-top: 0; padding-top: 0; }
}

@media (max-width: 768px) {
    .m20-shell { padding: 0 16px; }
    .m20-trust-row { flex-direction: column; gap: 6px; height: auto; padding: 8px 0; align-items: flex-start; }
    .m20-trust-left, .m20-trust-right { gap: 12px; flex-wrap: wrap; }
    .m20-hero { padding: 40px 0 32px; }
    .m20-hero h1 { font-size: 30px; }
    .m20-section-h h2 { font-size: 22px; }
    .m20-section-h { flex-direction: column; align-items: flex-start; gap: 6px; }
    .m20-feature-grid { grid-template-columns: 1fr; }
    .m20-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .m20-prod-attrs dl { grid-template-columns: 88px 1fr; }
    .m20-news-list li { grid-template-columns: 72px 1fr; gap: 16px; }
    .m20-news-list .arr { display: none; }
    .m20-cta-strip-row { grid-template-columns: 1fr; }
    .m20-cta-strip-tel { align-items: flex-start; }
    .m20-sitemap-list { grid-template-columns: 1fr; }
    .m20-prod-price { font-size: 28px; }
    .m20-footer-row { flex-direction: column; align-items: flex-start; }
}