/* ═══════════════════════════════════════════════════════════════════
   m3 皮肤 · Industrial Pro — 工业精装风
   定位:深蓝顶栏 + 锐利栅格 + 黑体压字 + 等宽数字
   跟 m4(暖白宋体留白派)形成视觉对位,适合机电/材料/装备类店铺
   ═══════════════════════════════════════════════════════════════════ */

:root {
    --m3-bg:        #f4f6f8;
    --m3-card:      #ffffff;
    --m3-ink:       #0b1426;
    --m3-ink-2:     #334155;
    --m3-ink-3:     #64748b;
    --m3-ink-4:     #94a3b8;
    --m3-line:      #e2e8f0;
    --m3-line-2:    #eef1f5;
    --m3-mast:      #0b1426;
    --m3-mast-2:    #131c33;
    --m3-accent:    #ff8c20;
    --m3-accent-h:  #d97316;
    --m3-cyan:      #0891b2;
    --m3-success:   #16a34a;
    --m3-radius:    3px;
    --m3-radius-lg: 6px;
}

* { box-sizing: border-box; }
body {
    margin: 0;
    background: var(--m3-bg);
    color: var(--m3-ink);
    font-family: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
    font-size: 14px;
    line-height: 1.65;
    font-feature-settings: "tnum" 1;
    -webkit-font-smoothing: antialiased;
}
::selection { background: var(--m3-accent); color: #fff; }
a { color: var(--m3-ink); text-decoration: none; transition: color .16s; }
a:hover { color: var(--m3-accent); }
img { max-width: 100%; vertical-align: middle; }

/* SEO 视觉隐藏 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; }

.m3-shell { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
.m3-mono { font-family: "JetBrains Mono", "Consolas", "Courier New", monospace; font-feature-settings: "tnum" 1, "lnum" 1; }

/* ═══ Header / 深蓝品牌栏 ═══ */
.m3-mast { background: var(--m3-mast); color: #e2e8f0; }
.m3-mast-top {
    border-bottom: 1px solid rgba(255,255,255,.06);
    font-size: 12px;
    color: #94a3b8;
}
.m3-mast-top-row {
    display: flex; justify-content: space-between; align-items: center;
    padding: 8px 0;
}
.m3-mast-top a { color: #94a3b8; }
.m3-mast-top a:hover { color: #fff; }
.m3-mast-top .sep { margin: 0 12px; color: #475569; }

.m3-mast-row {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 40px;
    align-items: center;
    padding: 24px 0;
}
.m3-brand { display: flex; align-items: center; gap: 16px; color: #fff; }
.m3-brand:hover { color: #fff; }
.m3-brand-logo {
    width: 60px; height: 60px;
    background: #fff;
    border-radius: var(--m3-radius);
    object-fit: contain;
    padding: 4px;
}
.m3-brand-text h1, .m3-brand-text .h1 {
    margin: 0; font-size: 20px; font-weight: 700; color: #fff;
    letter-spacing: -.01em;
}
.m3-brand-text p {
    margin: 4px 0 0;
    font-size: 12px; color: #94a3b8;
    letter-spacing: .04em;
}

.m3-mast-cta { text-align: right; }
.m3-mast-cta small {
    display: block; font-size: 10px; color: #94a3b8;
    letter-spacing: .18em; text-transform: uppercase; margin-bottom: 4px;
}
.m3-mast-cta strong {
    font-family: "JetBrains Mono", monospace;
    font-size: 22px; font-weight: 700; color: var(--m3-accent);
    letter-spacing: -.02em;
}

/* 主导航 */
.m3-nav {
    background: var(--m3-mast-2);
    border-top: 1px solid rgba(255,255,255,.04);
    border-bottom: 3px solid var(--m3-accent);
}
.m3-nav-inner { display: flex; }
.m3-nav a {
    padding: 14px 22px;
    color: #cbd5e1;
    font-size: 14px; font-weight: 500;
    border-right: 1px solid rgba(255,255,255,.04);
    transition: background .18s, color .18s;
    position: relative;
}
.m3-nav a:hover { background: rgba(255,255,255,.04); color: #fff; }
.m3-nav a.is-active {
    background: var(--m3-accent);
    color: #fff;
}
.m3-nav a:first-child {
    background: rgba(255,255,255,.04);
    color: #fff;
    font-weight: 600;
}

/* ═══ Section 通用 ═══ */
.m3-section { padding: 56px 0; }
.m3-section-sm { padding: 32px 0; }
.m3-section-h {
    display: flex; align-items: flex-end; justify-content: space-between;
    border-bottom: 1px solid var(--m3-line);
    padding-bottom: 16px; margin-bottom: 32px;
    position: relative;
}
.m3-section-h::before {
    content: "";
    position: absolute; left: 0; bottom: -1px;
    width: 60px; height: 3px; background: var(--m3-accent);
}
.m3-section-h h2 {
    margin: 0; font-size: 22px; font-weight: 700; color: var(--m3-ink);
    letter-spacing: -.01em;
}
.m3-section-h h2 small {
    font-family: "JetBrains Mono", monospace;
    font-weight: 400; font-size: 11px; color: var(--m3-ink-3);
    margin-left: 12px; letter-spacing: .12em; text-transform: uppercase;
}
.m3-section-h .more {
    font-size: 12px; color: var(--m3-ink-3);
    letter-spacing: .04em;
}
.m3-section-h .more::after { content: " →"; }
.m3-section-h .more:hover { color: var(--m3-accent); }

/* ═══ Hero ═══ */
.m3-hero {
    background: #fff;
    border-bottom: 1px solid var(--m3-line);
    padding: 64px 0 56px;
}
.m3-hero-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 56px;
    align-items: center;
}
.m3-hero h2 {
    font-size: 38px; font-weight: 800; color: var(--m3-ink);
    margin: 0 0 16px; letter-spacing: -.02em; line-height: 1.2;
}
.m3-hero h2 em {
    font-style: normal;
    background: linear-gradient(180deg, transparent 60%, rgba(255,140,32,.25) 60%);
    padding: 0 4px;
}
.m3-hero .tag {
    display: inline-block;
    font-family: "JetBrains Mono", monospace;
    font-size: 11px; letter-spacing: .14em; text-transform: uppercase;
    color: var(--m3-accent);
    padding: 4px 10px;
    background: rgba(255,140,32,.08);
    border: 1px solid rgba(255,140,32,.2);
    border-radius: var(--m3-radius);
    margin-bottom: 20px;
}
.m3-hero .lead {
    font-size: 14px; color: var(--m3-ink-2);
    margin: 0 0 28px;
    max-width: 540px;
}
.m3-hero-stats {
    display: grid; grid-template-columns: repeat(3, 1fr);
    gap: 0; border-top: 1px solid var(--m3-line);
    margin-top: 32px; padding-top: 24px;
}
.m3-hero-stats .stat { padding-right: 16px; border-right: 1px solid var(--m3-line); }
.m3-hero-stats .stat:last-child { border-right: 0; }
.m3-hero-stats strong {
    display: block;
    font-family: "JetBrains Mono", monospace;
    font-size: 28px; font-weight: 700; color: var(--m3-ink);
    letter-spacing: -.02em; line-height: 1;
}
.m3-hero-stats span {
    display: block; margin-top: 6px;
    font-size: 11px; color: var(--m3-ink-3);
    letter-spacing: .08em; text-transform: uppercase;
}
.m3-hero-img {
    aspect-ratio: 4 / 3;
    background: var(--m3-line-2);
    border: 1px solid var(--m3-line);
    border-radius: var(--m3-radius-lg);
    overflow: hidden;
}
.m3-hero-img img { width: 100%; height: 100%; object-fit: cover; }

/* ═══ Buttons ═══ */
.m3-cta-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.m3-btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 11px 22px;
    font-size: 14px; font-weight: 600;
    border-radius: var(--m3-radius);
    border: 1px solid transparent;
    transition: all .18s; cursor: pointer;
    white-space: nowrap;
}
.m3-btn-primary {
    background: var(--m3-accent); color: #fff;
    border-color: var(--m3-accent);
}
.m3-btn-primary:hover { background: var(--m3-accent-h); border-color: var(--m3-accent-h); color: #fff; }
.m3-btn-dark {
    background: var(--m3-mast); color: #fff; border-color: var(--m3-mast);
}
.m3-btn-dark:hover { background: var(--m3-mast-2); color: #fff; }
.m3-btn-outline {
    background: transparent; color: var(--m3-ink);
    border-color: var(--m3-line);
}
.m3-btn-outline:hover { border-color: var(--m3-accent); color: var(--m3-accent); }

/* ═══ 产品网格 ═══ */
.m3-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: var(--m3-line);
    border: 1px solid var(--m3-line);
}
.m3-card {
    background: #fff;
    display: flex; flex-direction: column;
    transition: background .18s, transform .18s;
    color: var(--m3-ink);
}
.m3-card:hover { background: #fff; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(11,20,38,.08); z-index: 2; color: var(--m3-ink); }
.m3-card-img {
    aspect-ratio: 1;
    background: #fafbfc;
    overflow: hidden;
    border-bottom: 1px solid var(--m3-line);
}
.m3-card-img img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform .35s ease;
}
.m3-card:hover .m3-card-img img { transform: scale(1.04); }
.m3-card-body { padding: 14px 16px 16px; flex: 1; display: flex; flex-direction: column; }
.m3-card-tag {
    display: inline-block; align-self: flex-start;
    font-family: "JetBrains Mono", monospace;
    font-size: 10px; letter-spacing: .08em; text-transform: uppercase;
    color: var(--m3-cyan);
    margin-bottom: 6px;
}
.m3-card-title {
    font-size: 14px; font-weight: 500; color: var(--m3-ink);
    margin: 0 0 12px; line-height: 1.5;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}
.m3-card-meta {
    display: flex; align-items: baseline; justify-content: space-between;
    border-top: 1px solid var(--m3-line-2);
    padding-top: 10px;
}
.m3-card-price {
    font-family: "JetBrains Mono", monospace;
    font-size: 16px; font-weight: 700; color: var(--m3-accent);
}
.m3-card-unit { font-size: 11px; color: var(--m3-ink-3); }

@media (max-width: 1024px) { .m3-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 720px)  { .m3-grid { grid-template-columns: repeat(2, 1fr); } }

/* ═══ 两栏布局(supply / 含侧边) ═══ */
.m3-layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 32px;
}
.m3-side-card {
    background: #fff;
    border: 1px solid var(--m3-line);
    border-radius: var(--m3-radius-lg);
    margin-bottom: 16px;
}
.m3-side-card h3 {
    margin: 0;
    padding: 14px 18px;
    font-size: 13px; font-weight: 700; color: var(--m3-ink);
    letter-spacing: .04em; text-transform: uppercase;
    border-bottom: 1px solid var(--m3-line);
    background: var(--m3-line-2);
    border-radius: var(--m3-radius-lg) var(--m3-radius-lg) 0 0;
}
.m3-side-list { list-style: none; margin: 0; padding: 8px 0; }
.m3-side-list li { padding: 0; }
.m3-side-list a {
    display: block;
    padding: 10px 18px;
    font-size: 13px; color: var(--m3-ink-2);
    border-left: 3px solid transparent;
    transition: all .18s;
}
.m3-side-list a:hover {
    background: var(--m3-line-2);
    border-left-color: var(--m3-accent);
    color: var(--m3-ink);
}
.m3-side-list a.is-active {
    border-left-color: var(--m3-accent);
    color: var(--m3-accent);
    font-weight: 600;
    background: rgba(255,140,32,.04);
}

/* ═══ 产品详情 ═══ */
.m3-prod-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    background: #fff;
    border: 1px solid var(--m3-line);
    border-radius: var(--m3-radius-lg);
    padding: 32px;
}
.m3-prod-img {
    aspect-ratio: 1;
    background: #fafbfc;
    border: 1px solid var(--m3-line);
    border-radius: var(--m3-radius);
    overflow: hidden;
}
.m3-prod-img img { width: 100%; height: 100%; object-fit: contain; }
.m3-prod-info h1 {
    margin: 0 0 12px;
    font-size: 24px; font-weight: 700; color: var(--m3-ink);
    line-height: 1.35;
}
.m3-prod-sub {
    display: flex; gap: 16px; flex-wrap: wrap;
    font-size: 12px; color: var(--m3-ink-3);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--m3-line-2);
}
.m3-prod-sub span::before { content: "· "; color: var(--m3-line); }
.m3-prod-sub span:first-child::before { content: ""; }
.m3-prod-price-box {
    background: var(--m3-line-2);
    border-left: 3px solid var(--m3-accent);
    padding: 18px 20px;
    margin-bottom: 24px;
    border-radius: 0 var(--m3-radius) var(--m3-radius) 0;
}
.m3-prod-price-box small {
    display: block;
    font-size: 11px; color: var(--m3-ink-3);
    letter-spacing: .12em; text-transform: uppercase;
    margin-bottom: 4px;
}
.m3-prod-price-box .price {
    font-family: "JetBrains Mono", monospace;
    font-size: 32px; font-weight: 700; color: var(--m3-accent);
    letter-spacing: -.02em;
}
.m3-prod-price-box .price-unit { font-size: 14px; color: var(--m3-ink-3); margin-left: 6px; }
.m3-prod-attrs {
    display: grid;
    grid-template-columns: 90px 1fr;
    gap: 0;
    margin: 0 0 28px;
    border-top: 1px solid var(--m3-line);
}
.m3-prod-attrs dt, .m3-prod-attrs dd {
    margin: 0;
    padding: 12px 16px;
    font-size: 13px;
    border-bottom: 1px solid var(--m3-line);
}
.m3-prod-attrs dt {
    background: var(--m3-line-2);
    color: var(--m3-ink-3);
    font-weight: 500;
    font-size: 12px;
}
.m3-prod-attrs dd { color: var(--m3-ink); font-weight: 500; }

/* ═══ Prose / 富文本 ═══ */
.m3-prose {
    background: #fff;
    border: 1px solid var(--m3-line);
    border-radius: var(--m3-radius-lg);
    padding: 32px 40px;
    font-size: 14px; color: var(--m3-ink-2);
    line-height: 1.85;
}
.m3-prose h1, .m3-prose h2, .m3-prose h3 { color: var(--m3-ink); margin-top: 1.5em; margin-bottom: .6em; }
.m3-prose h2 { font-size: 18px; }
.m3-prose h3 { font-size: 15px; }
.m3-prose p { margin: 0 0 1em; }
.m3-prose img { max-width: 100%; border-radius: var(--m3-radius); margin: 12px 0; }
.m3-prose ul, .m3-prose ol { margin: 0 0 1em; padding-left: 1.5em; }
.m3-prose table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 13px; }
.m3-prose th, .m3-prose td { border: 1px solid var(--m3-line); padding: 8px 12px; text-align: left; }
.m3-prose th { background: var(--m3-line-2); font-weight: 600; }

/* ═══ 联系信息 ═══ */
.m3-contact-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 24px;
}
.m3-contact-info {
    background: #fff;
    border: 1px solid var(--m3-line);
    border-radius: var(--m3-radius-lg);
    padding: 32px 36px;
}
.m3-contact-info dl {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 0;
    margin: 0;
}
.m3-contact-info dt, .m3-contact-info dd {
    padding: 14px 0;
    font-size: 13px;
    border-bottom: 1px dashed var(--m3-line);
    margin: 0;
}
.m3-contact-info dt { color: var(--m3-ink-3); font-size: 12px; letter-spacing: .04em; }
.m3-contact-info dd { color: var(--m3-ink); font-weight: 500; }
.m3-contact-info dd a { color: var(--m3-accent); }
.m3-contact-info dt:last-of-type, .m3-contact-info dd:last-of-type { border-bottom: 0; }
.m3-contact-qr {
    background: #fff;
    border: 1px solid var(--m3-line);
    border-radius: var(--m3-radius-lg);
    padding: 24px;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.m3-contact-qr img { width: 100%; max-width: 220px; }
.m3-contact-qr small {
    display: block; margin-top: 14px;
    font-size: 11px; color: var(--m3-ink-3);
    letter-spacing: .12em; text-transform: uppercase;
}

/* ═══ News list ═══ */
.m3-news-list {
    list-style: none; margin: 0; padding: 0;
    background: #fff;
    border: 1px solid var(--m3-line);
    border-radius: var(--m3-radius-lg);
    overflow: hidden;
}
.m3-news-list li {
    padding: 20px 28px;
    border-bottom: 1px solid var(--m3-line-2);
    display: grid;
    grid-template-columns: 1fr 100px;
    gap: 20px;
    align-items: center;
    transition: background .18s;
}
.m3-news-list li:last-child { border-bottom: 0; }
.m3-news-list li:hover { background: var(--m3-line-2); }
.m3-news-list .news-title {
    display: block;
    font-size: 15px; font-weight: 600; color: var(--m3-ink);
    margin-bottom: 6px;
}
.m3-news-list .news-summary {
    margin: 0;
    font-size: 13px; color: var(--m3-ink-3);
    display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden;
}
.m3-news-list .news-date {
    text-align: right;
    font-family: "JetBrains Mono", monospace;
    font-size: 12px; color: var(--m3-ink-3);
    letter-spacing: .04em;
}

/* ═══ Pager ═══ */
.m3-pager { margin-top: 32px; display: flex; justify-content: center; }
.m3-pager .pagination { display: inline-flex; gap: 4px; list-style: none; padding: 0; margin: 0; }
.m3-pager .pagination li a, .m3-pager .pagination li span {
    display: block; min-width: 36px; padding: 8px 12px;
    text-align: center;
    font-family: "JetBrains Mono", monospace;
    font-size: 13px;
    border: 1px solid var(--m3-line);
    border-radius: var(--m3-radius);
    background: #fff; color: var(--m3-ink-2);
}
.m3-pager .pagination .active span,
.m3-pager .pagination .current span,
.m3-pager .pagination li a:hover {
    background: var(--m3-mast); color: #fff; border-color: var(--m3-mast);
}

/* ═══ Footer ═══ */
.m3-footer {
    background: var(--m3-mast);
    color: #94a3b8;
    padding: 36px 0 24px;
    border-top: 3px solid var(--m3-accent);
}
.m3-footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid rgba(255,255,255,.06);
}
.m3-footer h4 {
    margin: 0 0 14px;
    font-size: 12px; color: #fff;
    letter-spacing: .14em; text-transform: uppercase;
    font-weight: 600;
}
.m3-footer p { margin: 0 0 6px; font-size: 12px; color: #94a3b8; line-height: 1.7; }
.m3-footer a { color: #94a3b8; font-size: 12px; line-height: 2; display: block; }
.m3-footer a:hover { color: var(--m3-accent); }
.m3-footer-copy {
    text-align: center; padding-top: 20px;
    font-size: 11px; color: #64748b;
    font-family: "JetBrains Mono", monospace;
}

/* ═══ 面包屑 ═══ */
.m3-crumb {
    background: #fff;
    border-bottom: 1px solid var(--m3-line);
    font-size: 12px;
    color: var(--m3-ink-3);
    font-family: "JetBrains Mono", monospace;
}
.m3-crumb-row { padding: 14px 0; }
.m3-crumb a { color: var(--m3-ink-3); }
.m3-crumb a:hover { color: var(--m3-accent); }
.m3-crumb .sep { margin: 0 8px; color: var(--m3-line); }

/* 响应式 */
@media (max-width: 960px) {
    .m3-hero-grid, .m3-prod-grid, .m3-contact-grid, .m3-footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .m3-layout { grid-template-columns: 1fr; }
    .m3-mast-row { grid-template-columns: 1fr; gap: 16px; text-align: center; }
    .m3-mast-cta { text-align: center; }
    .m3-brand { justify-content: center; }
    .m3-nav-inner { flex-wrap: wrap; }
    .m3-nav a { flex: 1 0 33.33%; text-align: center; padding: 12px 8px; font-size: 13px; }
    .m3-hero h2 { font-size: 28px; }
    .m3-news-list li { grid-template-columns: 1fr; }
    .m3-news-list .news-date { text-align: left; }
}