/* ═══════════════════════════════════════════════════════════════════
   m4 皮肤 · Modern Minimal — 现代极简卡片风
   定位:跟 m1(紧凑布局)区分;留白大、卡片淡阴影、思源宋体大标题
   ═══════════════════════════════════════════════════════════════════ */

:root {
    --m4-bg:        #f7f8fa;
    --m4-card:      #ffffff;
    --m4-ink:       #1a1f2e;
    --m4-ink-2:     #4a5568;
    --m4-ink-3:     #8b95a8;
    --m4-line:      #e6e9ef;
    --m4-line-2:    #f0f2f6;
    --m4-accent:    #ff8c20;
    --m4-accent-h:  #cc6e10;
    --m4-success:   #16a34a;
    --m4-shadow:    0 1px 3px rgba(15, 23, 42, .04);
    --m4-shadow-h:  0 8px 24px rgba(15, 23, 42, .08);
    --m4-radius:    12px;
    --m4-radius-sm: 6px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: var(--m4-bg);
    color: var(--m4-ink);
    font-family: "PingFang SC", "Microsoft YaHei", -apple-system, system-ui, sans-serif;
    font-size: 14px;
    line-height: 1.7;
    font-feature-settings: "tnum" 1, "lnum" 1;
    -webkit-font-smoothing: antialiased;
}
::selection { background: var(--m4-accent); color: #fff; }
a { color: var(--m4-ink); text-decoration: none; transition: color .18s; }
a:hover { color: var(--m4-accent); }
img { max-width: 100%; vertical-align: middle; }

.m4-shell { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ─── Header / 顶部品牌栏 ─── */
.m4-mast { background: #fff; border-bottom: 1px solid var(--m4-line); }
.m4-mast-row {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 32px;
    align-items: center;
    padding: 24px 0;
}
.m4-brand { display: flex; align-items: center; gap: 16px; }
.m4-brand-logo {
    width: 56px; height: 56px; border-radius: 8px; background: var(--m4-line-2);
    object-fit: cover; border: 1px solid var(--m4-line);
}
.m4-brand-text h1, .m4-brand-text .h1 {
    margin: 0; font-size: 18px; font-weight: 600; color: var(--m4-ink);
    font-family: "Noto Serif SC", "Songti SC", serif;
}
.m4-brand-text p { margin: 4px 0 0; font-size: 12px; color: var(--m4-ink-3); }

.m4-nav { display: flex; gap: 28px; }
.m4-nav a {
    font-size: 14px; padding: 8px 0; position: relative;
    color: var(--m4-ink-2); transition: color .2s;
}
.m4-nav a::after {
    content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 2px;
    background: var(--m4-accent); transform: scaleX(0); transform-origin: left;
    transition: transform .25s ease;
}
.m4-nav a:hover, .m4-nav a.is-active { color: var(--m4-ink); }
.m4-nav a:hover::after, .m4-nav a.is-active::after { transform: scaleX(1); }

.m4-tel { text-align: right; }
.m4-tel small { display: block; font-size: 11px; color: var(--m4-ink-3); letter-spacing: .12em; text-transform: uppercase; }
.m4-tel strong { font-family: "Noto Serif SC", serif; font-size: 18px; color: var(--m4-accent); font-weight: 700; }

/* ─── Section pattern ─── */
.m4-section { padding: 80px 0; }
.m4-section-sm { padding: 40px 0; }
.m4-section-h { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 32px; }
.m4-section-h h2 {
    margin: 0; font-size: 28px; font-weight: 600;
    font-family: "Noto Serif SC", serif; color: var(--m4-ink); letter-spacing: -.01em;
}
.m4-section-h h2 small {
    display: block; font-size: 12px; color: var(--m4-ink-3);
    margin-top: 6px; letter-spacing: .12em; text-transform: uppercase;
    font-family: "Manrope", sans-serif; font-weight: 400;
}
.m4-section-h .more { font-size: 13px; color: var(--m4-ink-2); }
.m4-section-h .more:hover { color: var(--m4-accent); }
.m4-section-h .more::after { content: " →"; transition: margin-left .2s; display: inline-block; }
.m4-section-h .more:hover::after { margin-left: 4px; }

/* ─── 产品卡片 grid ─── */
.m4-grid {
    display: grid; gap: 24px;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}
.m4-card {
    background: var(--m4-card); border: 1px solid var(--m4-line);
    border-radius: var(--m4-radius); overflow: hidden;
    transition: transform .25s, box-shadow .25s, border-color .25s;
    display: block;
}
.m4-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--m4-shadow-h);
    border-color: var(--m4-line);
}
.m4-card-img {
    aspect-ratio: 4/3; background: var(--m4-line-2); overflow: hidden;
}
.m4-card-img img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform .55s;
}
.m4-card:hover .m4-card-img img { transform: scale(1.04); }
.m4-card-body { padding: 16px 18px; }
.m4-card-title {
    margin: 0 0 8px; font-size: 14px; line-height: 1.5; color: var(--m4-ink);
    overflow: hidden; display: -webkit-box; -webkit-line-clamp: 2;
    -webkit-box-orient: vertical; min-height: 2.6em;
}
.m4-card-meta { display: flex; align-items: baseline; justify-content: space-between; }
.m4-card-price { color: var(--m4-accent); font-weight: 600; font-size: 16px; font-family: "Manrope", sans-serif; }
.m4-card-price small { color: var(--m4-ink-3); font-size: 12px; font-weight: 400; margin-left: 2px; }
.m4-card-tag {
    display: inline-block; padding: 2px 8px; border-radius: 99px;
    background: rgba(255, 140, 32, .1); color: var(--m4-accent);
    font-size: 11px; font-weight: 500;
}

/* ─── Hero(店铺首页大图)─── */
.m4-hero {
    background: #fff;
    border-bottom: 1px solid var(--m4-line);
    padding: 80px 0;
    position: relative;
}
.m4-hero-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 64px; align-items: center; }
.m4-hero h1 {
    font-family: "Noto Serif SC", serif; font-size: 48px; line-height: 1.1; font-weight: 700;
    color: var(--m4-ink); margin: 0 0 20px; letter-spacing: -.02em;
}
.m4-hero h1 em { font-style: normal; color: var(--m4-accent); }
.m4-hero p.lead { font-size: 16px; color: var(--m4-ink-2); line-height: 1.8; margin: 0 0 32px; max-width: 520px; }
.m4-hero-stats { display: flex; gap: 48px; padding-top: 32px; border-top: 1px solid var(--m4-line); }
.m4-hero-stats .stat strong {
    display: block; font-family: "Manrope", sans-serif; font-size: 32px;
    font-weight: 700; color: var(--m4-ink); line-height: 1;
}
.m4-hero-stats .stat span { font-size: 12px; color: var(--m4-ink-3); margin-top: 6px; display: block; }
.m4-hero-img {
    aspect-ratio: 4/3; border-radius: var(--m4-radius); overflow: hidden;
    background: var(--m4-line-2); box-shadow: var(--m4-shadow-h);
}
.m4-hero-img img { width: 100%; height: 100%; object-fit: cover; }

/* ─── Sidebar(产品分类等)─── */
.m4-layout { display: grid; grid-template-columns: 240px 1fr; gap: 40px; }
.m4-side { position: sticky; top: 24px; align-self: start; }
.m4-side-card {
    background: #fff; border: 1px solid var(--m4-line); border-radius: var(--m4-radius);
    padding: 24px; margin-bottom: 24px;
}
.m4-side-card h3 {
    margin: 0 0 16px; font-size: 14px; font-weight: 600; color: var(--m4-ink);
    padding-bottom: 12px; border-bottom: 1px solid var(--m4-line);
}
.m4-side-list { list-style: none; padding: 0; margin: 0; }
.m4-side-list li { padding: 8px 0; border-bottom: 1px dashed var(--m4-line-2); }
.m4-side-list li:last-child { border-bottom: 0; }
.m4-side-list a { font-size: 13px; color: var(--m4-ink-2); display: flex; justify-content: space-between; }
.m4-side-list a::after { content: "›"; color: var(--m4-ink-3); transition: transform .2s; display: inline-block; }
.m4-side-list a:hover { color: var(--m4-accent); }
.m4-side-list a:hover::after { transform: translateX(3px); color: var(--m4-accent); }

/* ─── 产品详情专用 ─── */
.m4-prod-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; }
.m4-prod-img {
    aspect-ratio: 1/1; border-radius: var(--m4-radius); overflow: hidden;
    background: var(--m4-line-2); border: 1px solid var(--m4-line);
}
.m4-prod-img img { width: 100%; height: 100%; object-fit: cover; }
.m4-prod-info h1 {
    margin: 0 0 16px; font-size: 32px; font-weight: 600; line-height: 1.3;
    font-family: "Noto Serif SC", serif; color: var(--m4-ink);
}
.m4-prod-price-box {
    background: linear-gradient(135deg, #fff7ee, #fff);
    border: 1px solid var(--m4-line); border-left: 3px solid var(--m4-accent);
    padding: 24px; border-radius: var(--m4-radius); margin: 24px 0;
}
.m4-prod-price {
    font-family: "Manrope", sans-serif; font-size: 36px; font-weight: 700; color: var(--m4-accent);
}
.m4-prod-price small { font-size: 14px; color: var(--m4-ink-3); margin-left: 4px; font-weight: 400; }
.m4-prod-attrs {
    display: grid; grid-template-columns: 100px 1fr; gap: 12px 24px;
    padding: 24px 0; border-top: 1px solid var(--m4-line); border-bottom: 1px solid var(--m4-line);
    font-size: 14px;
}
.m4-prod-attrs dt { color: var(--m4-ink-3); margin: 0; }
.m4-prod-attrs dd { color: var(--m4-ink); margin: 0; font-weight: 500; }
.m4-cta-row { display: flex; gap: 12px; margin-top: 32px; }
.m4-btn {
    display: inline-flex; align-items: center; justify-content: center;
    height: 48px; padding: 0 28px; border-radius: var(--m4-radius-sm);
    font-size: 15px; font-weight: 500; cursor: pointer; transition: all .2s;
    border: 0;
}
.m4-btn-primary {
    background: var(--m4-accent); color: #fff;
    box-shadow: 0 4px 12px rgba(255, 140, 32, .25);
}
.m4-btn-primary:hover { background: var(--m4-accent-h); color: #fff; transform: translateY(-1px); }
.m4-btn-outline {
    background: #fff; color: var(--m4-ink); border: 1px solid var(--m4-line);
}
.m4-btn-outline:hover { border-color: var(--m4-accent); color: var(--m4-accent); }

/* ─── 详情正文(rich text)─── */
.m4-prose { max-width: 880px; margin: 0 auto; }
.m4-prose h1, .m4-prose h2, .m4-prose h3 { font-family: "Noto Serif SC", serif; font-weight: 600; color: var(--m4-ink); }
.m4-prose h1 { font-size: 32px; }
.m4-prose h2 { font-size: 24px; margin: 56px 0 20px; }
.m4-prose h3 { font-size: 18px; margin: 32px 0 12px; }
.m4-prose p { font-size: 15px; line-height: 1.9; color: var(--m4-ink-2); margin: 16px 0; }
.m4-prose img { max-width: 100%; border-radius: var(--m4-radius); margin: 24px 0; }
.m4-prose ul, .m4-prose ol { padding-left: 24px; }
.m4-prose li { margin: 8px 0; line-height: 1.8; }
.m4-prose blockquote {
    border-left: 3px solid var(--m4-accent); padding: 8px 24px;
    margin: 24px 0; color: var(--m4-ink-2); background: var(--m4-line-2);
    border-radius: 0 var(--m4-radius-sm) var(--m4-radius-sm) 0;
}

/* ─── 资讯/新闻列表 ─── */
.m4-news-list { list-style: none; padding: 0; margin: 0; }
.m4-news-list li {
    padding: 24px 0; border-bottom: 1px solid var(--m4-line);
    display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: baseline;
}
.m4-news-list li a { font-size: 16px; color: var(--m4-ink); transition: color .2s; }
.m4-news-list li a:hover { color: var(--m4-accent); }
.m4-news-list li .date {
    font-family: "Manrope", sans-serif; font-size: 12px;
    color: var(--m4-ink-3); white-space: nowrap;
}
.m4-news-list li .summary { grid-column: 1 / -1; font-size: 13px; color: var(--m4-ink-3); margin-top: 6px; }

/* ─── 联系页 ─── */
.m4-contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.m4-contact-info dl { display: grid; grid-template-columns: 100px 1fr; gap: 16px 24px; }
.m4-contact-info dt { color: var(--m4-ink-3); font-size: 13px; }
.m4-contact-info dd { margin: 0; color: var(--m4-ink); font-size: 14px; }
.m4-contact-info dd a { color: var(--m4-accent); }
.m4-contact-map {
    aspect-ratio: 4/3; border-radius: var(--m4-radius); overflow: hidden;
    background: var(--m4-line-2); border: 1px solid var(--m4-line);
}

/* ─── Footer ─── */
.m4-footer {
    background: #fff; border-top: 1px solid var(--m4-line); padding: 48px 0 32px; margin-top: 80px;
}
.m4-footer .m4-shell { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.m4-footer p { margin: 0; font-size: 12px; color: var(--m4-ink-3); }
.m4-footer .links { display: flex; gap: 24px; }
.m4-footer .links a { font-size: 12px; color: var(--m4-ink-2); }
.m4-footer .links a:hover { color: var(--m4-accent); }

/* ─── Pagination ─── */
.m4-pager { display: flex; justify-content: center; gap: 4px; padding: 32px 0; }
.m4-pager a, .m4-pager span {
    min-width: 36px; height: 36px; padding: 0 12px;
    border-radius: var(--m4-radius-sm); display: inline-flex; align-items: center; justify-content: center;
    font-size: 13px; color: var(--m4-ink-2); background: #fff; border: 1px solid var(--m4-line);
}
.m4-pager a:hover { border-color: var(--m4-accent); color: var(--m4-accent); }
.m4-pager .active, .m4-pager span.active {
    background: var(--m4-accent); color: #fff; border-color: var(--m4-accent);
}

/* ─── 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}

/* ─── 响应式 ─── */
@media (max-width: 960px) {
    .m4-mast-row { grid-template-columns: auto 1fr; }
    .m4-nav, .m4-tel { display: none; }
    .m4-hero-grid, .m4-prod-grid, .m4-contact-grid { grid-template-columns: 1fr; gap: 32px; }
    .m4-layout { grid-template-columns: 1fr; }
    .m4-side { position: static; }
    .m4-hero h1 { font-size: 32px; }
    .m4-section { padding: 48px 0; }
}
@media (max-width: 560px) {
    .m4-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
    .m4-hero h1 { font-size: 26px; }
    .m4-section-h h2 { font-size: 22px; }
}