/* 压铸首页保留通栏 Banner，横幅图片独立适配桌面与手机构图。 */
.hero-diecasting { background: #edf2f8; }
.hero-diecasting::before { background: linear-gradient(90deg, #f6fbff 0%, rgba(246,251,255,.98) 31%, rgba(246,251,255,.78) 44%, rgba(246,251,255,.08) 56%, transparent 64%); }
.hero-diecasting::after { display: none; }
.hero-diecasting .hero-slide { background-size: cover; background-position: right center; filter: none; }
.hero-diecasting .hero-copy { max-width: 640px; }
.hero-diecasting h1 { font-size: clamp(48px, 5.8vw, 84px); line-height: 1.12; letter-spacing: -.04em; }
.hero-diecasting .hero-metric strong { font-family: inherit; font-size: 19px; }
.diecasting-strength .stat { min-height: 150px; }
.diecasting-strength .stat strong { font: 650 clamp(20px, 2vw, 28px)/1.4 "PingFang SC", "Microsoft YaHei", sans-serif; letter-spacing: -.025em; }

/* 镁合金介绍以产品大图和应用场景为主，优势文案保持简短。 */
.magnesium-section { padding: 90px 0; background: #fff; }
.magnesium-section .section-head { margin-bottom: 38px; }
.magnesium-section h2 { font-size: clamp(28px, 3.1vw, 44px); line-height: 1.3; }
.magnesium-section .section-head > p { max-width: 390px; }
.magnesium-showcase { display: grid; grid-template-columns: 1.05fr 1fr; gap: 24px; }
.magnesium-feature { position: relative; min-width: 0; min-height: 380px; margin: 0; overflow: hidden; border-radius: 20px; background: #e8edf4; }
.magnesium-feature > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 55%; }
.magnesium-feature figcaption { position: absolute; inset: auto 0 0; padding: 52px 30px 26px; background: linear-gradient(transparent, rgba(232,237,244,.96) 70%); }
.magnesium-feature figcaption span { display: block; margin-bottom: 9px; color: #547991; font: 600 9px/1.5 Arial, sans-serif; letter-spacing: .13em; }
.magnesium-feature figcaption strong { color: #183348; font-size: 24px; font-weight: 600; }
.magnesium-benefits { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.magnesium-benefits article { display: flex; flex-direction: column; justify-content: center; min-width: 0; padding: 28px 24px; border: 1px solid #e0eaf2; border-radius: 18px; background: linear-gradient(145deg, #f7fbfe, #fff); }
.magnesium-index { color: #2384c6; font: 600 10px/1.6 Arial, sans-serif; letter-spacing: .08em; }
.magnesium-benefits h3 { margin: 22px 0 10px; color: #183348; font-size: 22px; line-height: 1.4; }
.magnesium-benefits p, .magnesium-applications p { margin: 0; color: #6b8293; font-size: 14px; line-height: 1.9; }
.magnesium-applications { margin-top: 44px; }
.magnesium-app-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 24px; margin-bottom: 24px; }
.magnesium-app-heading h3 { margin: 0; color: #183348; font-size: 23px; line-height: 1.4; }
.magnesium-app-heading > p { font-size: 13px; }
.magnesium-application-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 20px; }
.magnesium-application { min-width: 0; margin: 0; overflow: hidden; border: 1px solid #e0eaf2; border-radius: 18px; background: #fff; }
.magnesium-application > img { width: 100%; height: auto; aspect-ratio: 4 / 3; object-fit: cover; background: #e8edf4; }
.magnesium-application figcaption { position: relative; padding: 21px 22px; background: #fff; }
.magnesium-application-grid h4 { margin: 0 0 7px; color: #183348; font-size: 19px; }
.magnesium-application-grid p { font-size: 13px; }

/* 四业务入口：独立样式，避免旧产品网格的多轮覆盖影响尺寸和对齐。 */
.business-section { padding: 96px 0; background: #f5f9fc; }
.business-section .section-head { align-items: end; margin-bottom: 38px; }
.business-section .section-head h2 { font-size: clamp(28px, 3.1vw, 44px); line-height: 1.3; }
.business-section .section-head > p { max-width: 330px; font-size: 15px; line-height: 1.85; }
.business-section .section-kicker { color: #167dc6; }
.business-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.business-card { display: grid; grid-template-columns: 1fr 1fr; min-width: 0; overflow: hidden; border: 1px solid #e0e9f0; border-radius: 22px; background: #fff; box-shadow: 0 10px 32px rgba(25,66,97,.035); transition: border-color .3s, box-shadow .3s; }
.business-card:hover { border-color: #b6d7ed; box-shadow: 0 16px 40px rgba(25,66,97,.08); }
.business-card-copy { display: flex; flex-direction: column; align-items: flex-start; min-width: 0; min-height: 310px; padding: 34px 28px 27px; }
.business-code { color: #6c8699; font: 600 9px/1.6 Arial,sans-serif; letter-spacing: .1em; }
.business-card h3 { margin: 21px 0 12px; color: #142e42; font-size: clamp(23px, 2vw, 29px); font-weight: 650; line-height: 1.3; letter-spacing: -.035em; }
.business-card-copy > p { margin: 0; color: #738796; font-size: 13px; line-height: 1.9; }
.business-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.business-tags span { padding: 4px 8px; border-radius: 5px; color: #668093; background: #f3f7fa; font-size: 10px; line-height: 1.6; }
.business-link { display: flex; justify-content: space-between; align-items: center; align-self: stretch; margin-top: auto; padding-top: 24px; color: #177cbf; font-size: 12px; font-weight: 600; }
.business-card-copy:focus-visible { outline: 2px solid #1688e5; outline-offset: -5px; border-radius: 12px; }
.business-gallery { position: relative; min-width: 0; overflow: hidden; background: #e8edf4; touch-action: pan-y; isolation: isolate; }
/* 方形底图完整居中；只柔化最外侧 2% 的背景，使不同屏幕比例下也没有拼接色带。 */
.business-gallery > img, .business-slide {
  position: absolute; inset: auto; top: 50%; left: 50%; width: auto; height: auto; max-width: 100%; max-height: 100%;
  transform: translate(-50%, -50%); object-fit: contain; object-position: center; user-select: none; -webkit-user-drag: none;
  -webkit-mask-image: linear-gradient(to right, transparent, #000 2%, #000 98%, transparent), linear-gradient(to bottom, transparent, #000 2%, #000 98%, transparent);
  mask-image: linear-gradient(to right, transparent, #000 2%, #000 98%, transparent), linear-gradient(to bottom, transparent, #000 2%, #000 98%, transparent);
  -webkit-mask-composite: source-in;
  mask-composite: intersect;
}
.business-slide { opacity: 0; transition: opacity .65s ease; }
.business-slide.is-current { opacity: 1; }
.business-gallery:focus-visible { outline: 2px solid #1688e5; outline-offset: -5px; }
.business-dots { display: flex; justify-content: center; position: absolute; z-index: 1; left: 12px; right: 12px; bottom: 12px; gap: 2px; }
.business-dot { display: grid; place-items: center; width: 30px; height: 30px; padding: 0; border: 0; background: transparent; border-radius: 50%; cursor: pointer; }
.business-dot::before { content: ''; width: 6px; height: 6px; border-radius: 20px; background: #91a8ba; transition: width .3s, background .3s; }
.business-dot[aria-pressed="true"]::before { width: 20px; background: #137fc9; }
.business-dot:focus-visible { outline: 2px solid #137fc9; outline-offset: -3px; }

/* 详情页沿用网站品牌，四类内容使用同一个静态模板。 */
.business-detail-page { background: #f7fafc; }
.business-detail-page .site-header { background: rgba(255,255,255,.96); }
.detail-main { padding-top: 88px; }
.detail-breadcrumb { display: flex; flex-wrap: wrap; gap: 12px; padding: 28px 0; color: #8c9da9; font-size: 12px; line-height: 1.6; }
.detail-breadcrumb a:hover { color: #1688e5; }
.detail-breadcrumb [aria-current] { color: #426278; }
.detail-hero { display: grid; grid-template-columns: 1.05fr 1fr; align-items: center; gap: 70px; padding-bottom: 72px; }
.detail-kicker { margin: 0 0 22px; color: #1885c9; font: 600 11px/1.5 Arial,sans-serif; letter-spacing: .15em; }
.detail-copy h1 { margin: 0 0 20px; font-size: clamp(36px, 4.5vw, 64px); letter-spacing: -.04em; line-height: 1.15; color: #142e42; }
.detail-tagline { margin: 0 0 24px; color: #476c85; font-size: 22px; line-height: 1.6; }
.detail-intro { margin: 0; color: #6b8293; font-size: 15px; line-height: 2; }
.detail-copy .business-tags { margin-top: 28px; gap: 10px; }
.detail-copy .business-tags span { padding: 7px 12px; font-size: 12px; background: #eaf2f8; }
.detail-visual { min-width: 0; margin: 0; }
.detail-visual .business-gallery { aspect-ratio: 1; border-radius: 24px; border: 1px solid #e0e9f0; }
.detail-section { padding: 62px 0; border-top: 1px solid #e2ebf2; }
.detail-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 24px; margin-bottom: 28px; }
.detail-heading h2 { margin: 0; color: #183348; font-size: 30px; font-weight: 600; }
.detail-heading > p { margin: 0; color: #7c91a1; font-size: 13px; line-height: 1.7; }
.detail-scope { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 22px; }
.detail-scope article { padding: 28px; border: 1px solid #e0e9f0; border-radius: 16px; background: #fff; }
.detail-scope small { color: #1688e5; font: 600 10px Arial,sans-serif; letter-spacing: .1em; }
.detail-scope h3 { margin: 18px 0 12px; font-size: 20px; color: #183348; }
.detail-scope p { margin: 0; color: #718799; font-size: 14px; line-height: 1.9; }
.detail-project { display: grid; grid-template-columns: .8fr 1.2fr; align-items: start; gap: 70px; }
.detail-project h2 { margin: 0; color: #183348; font-size: 30px; line-height: 1.4; }
.detail-project p { margin: 0; color: #6c8395; font-size: 15px; line-height: 1.9; }
.detail-project .business-tags { margin-top: 22px; }
.detail-project .business-tags span { font-size: 12px; padding: 6px 10px; background: #eaf2f8; }
.detail-shortcuts { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 14px; }
.detail-shortcuts a { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 68px; padding: 16px 20px; border: 1px solid #dce7ef; border-radius: 12px; background: #fff; color: #42657e; font-size: 14px; }
.detail-shortcuts a:hover, .detail-shortcuts a[aria-current="page"] { color: #0878c8; border-color: #a7cfea; background: #edf7fe; }
.detail-shortcuts a span { color: #7ba9ca; }
.detail-return { display: inline-block; margin-top: 28px; color: #688397; font-size: 13px; }

@media (max-width: 1050px) {
  .magnesium-showcase { grid-template-columns: 1fr 1fr; gap: 18px; }
  .magnesium-benefits article { padding: 24px 18px; }
  .magnesium-benefits h3 { font-size: 19px; }
  .magnesium-index { font-size: 8px; }
  .magnesium-application-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .diecasting-strength .stat { padding-inline: 16px; }
  .business-card { grid-template-columns: 46% minmax(0,1fr); }
  .business-card-copy { padding: 28px 22px 24px; }
  .business-code { font-size: 8px; }
  .business-card h3 { font-size: 24px; }
  .detail-hero { gap: 36px; }
  .detail-project { gap: 36px; }
}
@media (max-width: 780px) {
  .hero-diecasting { background: #f6fbff; }
  .hero-diecasting::before { background: linear-gradient(180deg, #f6fbff 0%, #f6fbff 51%, rgba(246,251,255,.92) 59%, rgba(246,251,255,.12) 76%, transparent 100%); }
  .hero-diecasting .hero-slides { background: #e8edf4; }
  .hero-diecasting .hero-slide { background-size: auto 100%; background-position: right center; }
  .hero-diecasting h1 { font-size: clamp(38px, 10.6vw, 58px); line-height: 1.12; }
  .hero-diecasting .eyebrow { font-size: 9px; letter-spacing: .08em; }
  .diecasting-strength .stat { min-height: 135px; padding: 34px 8px 20px; }
  .diecasting-strength .stat strong { min-height: 30px; font-size: clamp(18px, 4.8vw, 24px); }
  .diecasting-strength .stat p { margin-top: 8px; }
  .magnesium-section { padding: 52px 0 64px; }
  .magnesium-section .section-head { margin-bottom: 28px; }
  .magnesium-section h2 { font-size: clamp(24px, 6.5vw, 32px); }
  .magnesium-showcase { grid-template-columns: minmax(0, 1fr); gap: 16px; }
  .magnesium-feature { min-height: 0; aspect-ratio: 4 / 3; border-radius: 18px; }
  .magnesium-feature figcaption { padding: 36px 22px 20px; }
  .magnesium-feature figcaption strong { font-size: 21px; }
  .magnesium-benefits { gap: 12px; }
  .magnesium-benefits article { padding: 24px 16px; border-radius: 16px; }
  .magnesium-index { font-size: 8px; letter-spacing: .035em; }
  .magnesium-benefits h3 { margin: 16px 0 8px; font-size: 18px; }
  .magnesium-benefits p { font-size: 12px; line-height: 1.8; }
  .magnesium-applications { margin-top: 34px; }
  .magnesium-app-heading { flex-direction: column; align-items: center; gap: 10px; margin-bottom: 22px; text-align: center; }
  .magnesium-app-heading h3 { font-size: 22px; }
  .magnesium-application-grid { gap: 16px 12px; }
  .magnesium-application { border-radius: 14px; }
  .magnesium-application figcaption { padding: 18px 12px; text-align: center; }
  .magnesium-application-grid h4 { font-size: 17px; }
  .magnesium-application-grid p { font-size: 11px; }
  .business-section { padding: 64px 0; }
  .business-section .section-head { align-items: center; margin-bottom: 28px; }
  .business-section .section-head h2 { font-size: clamp(24px, 6.5vw, 32px); }
  .business-section .section-head > p { font-size: 14px; }
  .business-grid { grid-template-columns: minmax(0,1fr); gap: 20px; }
  .business-card { grid-template-columns: minmax(0,1fr); border-radius: 20px; }
  .business-card .business-gallery { height: auto; aspect-ratio: 4 / 3; }
  .business-card-copy { align-items: center; min-height: 228px; padding: 25px 24px 22px; text-align: center; }
  .business-code { font-size: 9px; }
  .business-card h3 { margin: 12px 0 10px; font-size: 26px; }
  .business-card-copy > p { font-size: 13px; }
  .business-card .business-tags { justify-content: center; margin-top: 12px; }
  .business-link { justify-content: center; gap: 20px; padding-top: 18px; }
  .detail-main { padding-top: 72px; }
  .detail-breadcrumb { padding: 24px 0; gap: 9px; font-size: 11px; }
  .detail-hero { grid-template-columns: minmax(0,1fr); gap: 30px; padding-bottom: 40px; }
  .detail-copy { text-align: center; }
  .detail-kicker { font-size: 10px; margin-bottom: 16px; }
  .detail-copy h1 { font-size: 38px; margin-bottom: 16px; }
  .detail-tagline { font-size: 18px; margin-bottom: 18px; }
  .detail-intro { font-size: 14px; line-height: 1.9; }
  .detail-copy .business-tags { justify-content: center; margin-top: 22px; }
  .detail-copy .business-tags span { font-size: 11px; }
  .detail-visual .business-gallery { aspect-ratio: 1; border-radius: 20px; }
  .detail-section { padding: 40px 0; }
  .detail-heading { flex-direction: column; align-items: center; gap: 12px; text-align: center; }
  .detail-heading h2, .detail-project h2 { font-size: 26px; }
  .detail-scope { grid-template-columns: minmax(0,1fr); gap: 14px; }
  .detail-scope article { padding: 24px; text-align: center; }
  .detail-scope h3 { margin: 12px 0; }
  .detail-project { grid-template-columns: minmax(0,1fr); gap: 18px; text-align: center; }
  .detail-project p { font-size: 14px; }
  .detail-project .business-tags { justify-content: center; }
  .detail-shortcuts { grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; }
  .detail-shortcuts a { padding: 14px; font-size: 12px; min-height: 60px; }
  .detail-return { display: block; text-align: center; }
}
@media (max-width: 380px) {
  .magnesium-benefits article { padding: 20px 12px; }
  .magnesium-benefits h3 { font-size: 16px; }
  .magnesium-index { font-size: 7px; letter-spacing: 0; }
  .magnesium-application-grid h4 { font-size: 15px; }
  .detail-copy h1 { font-size: 32px; }
}
@media (prefers-reduced-motion: reduce) {
  .business-slide, .business-card, .business-dot::before { transition: none; }
}