/* 线切割精密加工技术平台 —— 原创样式（站点级独立实现） */
:root {
  --h2-inset: 16px;
  --c-ink: #0e1726;
  --c-sub: #4a5a72;
  --c-line: #e3e9f2;
  --c-brand: #0f6fd6;
  --c-brand-2: #19c3c9;
  --c-accent: #ff7a18;
  --c-bg: #ffffff;
  --c-bg-2: #f4f8fd;
  --radius: 12px;
  --maxw: 1100px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  color: var(--c-ink);
  background: var(--c-bg);
  line-height: 1.75;
  padding-top: 64px;
}
img { max-width: 100%; }
a { color: var(--c-brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.skip {
  position: absolute; left: -999px;
}
.skip:focus { left: 8px; top: 8px; background: #fff; padding: 8px 12px; z-index: 200; }

/* 布局容器 */
.shell { width: 100%; }
.breadcrumb {
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--h2-inset);
  padding-right: 16px;
  padding-top: 14px;
  padding-bottom: 6px;
  font-size: 13px;
  color: var(--c-sub);
}
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.breadcrumb li:not(:last-child)::after { content: "›"; margin-left: 6px; color: var(--c-line); }
.breadcrumb a { color: var(--c-sub); }
.breadcrumb [aria-current="page"] { color: var(--c-ink); font-weight: 600; }

/* 顶部导航 */
.site-head {
  position: fixed; top: 0; left: 0; right: 0; height: 64px; z-index: 100;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--c-line);
}
.head-inner {
  max-width: var(--maxw); margin: 0 auto; height: 64px;
  display: flex; align-items: center; gap: 18px; padding: 0 16px;
}
.brand { font-weight: 800; font-size: 18px; color: var(--c-ink); white-space: nowrap; }
.primary-nav { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.primary-nav > a, .nav-group > summary {
  padding: 8px 12px; border-radius: 8px; color: var(--c-sub); cursor: pointer; font-size: 15px;
}
.primary-nav > a:hover, .nav-group > summary:hover { background: var(--c-bg-2); text-decoration: none; }
.nav-group { position: relative; }
.nav-group > summary { list-style: none; }
.nav-group > summary::-webkit-details-marker { display: none; }
.nav-group > summary::after { content: "▾"; margin-left: 4px; font-size: 11px; }
.nav-sub {
  position: absolute; top: 100%; left: 0; min-width: 160px;
  background: #fff; border: 1px solid var(--c-line); border-radius: 10px;
  box-shadow: 0 12px 30px rgba(20,40,80,0.12); padding: 6px; display: none; flex-direction: column;
}
.nav-group[open] > .nav-sub { display: flex; }
.nav-sub a { padding: 8px 10px; border-radius: 6px; color: var(--c-sub); }
.nav-sub a:hover { background: var(--c-bg-2); }
.nav-toggle { display: none; margin-left: auto; border: 1px solid var(--c-line); background: #fff;
  border-radius: 8px; padding: 8px 12px; font-size: 14px; cursor: pointer; }

/* Hero */
.hero { background: linear-gradient(135deg, #0b2a52 0%, #0f6fd6 55%, #19c3c9 100%); color: #fff; }
.hero-inner { max-width: var(--maxw); margin: 0 auto; padding: 64px 16px; }
.hero-title { font-size: 34px; margin: 0 0 14px; line-height: 1.3; }
.hero-sub { font-size: 17px; max-width: 760px; opacity: 0.95; margin: 0 0 24px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-primary, .btn-ghost {
  display: inline-block; padding: 12px 22px; border-radius: 999px; font-weight: 700;
}
.btn-primary { background: var(--c-accent); color: #fff; }
.btn-ghost { border: 1px solid rgba(255,255,255,0.7); color: #fff; }

/* 区块标题 */
.sec-title { max-width: var(--maxw); margin: 40px auto 16px; padding: 0 16px; font-size: 22px; }
.home-cats, .home-articles, .home-products { padding-bottom: 8px; }
.cat-cards { max-width: var(--maxw); margin: 0 auto; padding: 0 16px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.cat-card {
  display: flex; flex-direction: column; gap: 6px; padding: 18px;
  border: 1px solid var(--c-line); border-radius: var(--radius); background: var(--c-bg-2); color: var(--c-ink);
}
.cat-card:hover { border-color: var(--c-brand); text-decoration: none; transform: translateY(-2px); transition: .15s; }
.cat-card-name { font-weight: 700; font-size: 16px; }
.cat-card-desc { font-size: 13px; color: var(--c-sub); }

.home-article-list, .home-product-list { max-width: var(--maxw); margin: 0 auto; padding: 0 16px; list-style: none; }
.home-article-row, .home-product-row { padding: 14px 0; border-bottom: 1px solid var(--c-line); }
.ha-title, .hp-title { font-weight: 700; }
.ha-cat, .hp-cat { font-size: 12px; color: var(--c-brand); margin-left: 8px; }
.ha-sum, .hp-sum { margin: 4px 0 0; color: var(--c-sub); font-size: 14px; }
.more-link { display: block; max-width: var(--maxw); margin: 12px auto 0; padding: 0 16px; font-weight: 600; }

/* 首页：Hero 数据亮点 */
.hero-stats { list-style: none; display: flex; flex-wrap: wrap; gap: 14px 40px; margin: 32px 0 0; padding: 0; }
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats b { font-size: 20px; line-height: 1.4; }
.hero-stats span { font-size: 13px; opacity: 0.85; }

/* 首页：站点介绍 */
.home-intro { max-width: var(--maxw); margin: 0 auto; padding: 8px 16px 0; }
.home-intro-grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 28px; align-items: start; }
.intro-copy p { margin: 0 0 12px; color: var(--c-sub); }
.intro-steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.intro-steps li { display: flex; gap: 12px; align-items: flex-start; background: var(--c-bg-2);
  border: 1px solid var(--c-line); border-radius: var(--radius); padding: 12px 14px; }
.step-no { flex: none; width: 28px; height: 28px; border-radius: 14px; background: var(--c-brand); color: #fff;
  font-weight: 700; display: flex; align-items: center; justify-content: center; font-size: 14px; }
.intro-steps b { display: block; }
.intro-steps p { margin: 0; font-size: 13px; color: var(--c-sub); }

/* 首页：能力优势 */
.feat-cards { max-width: var(--maxw); margin: 0 auto; padding: 0 16px;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.feat-card { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 18px; }
.feat-card b { display: block; margin-bottom: 6px; }
.feat-card p { margin: 0; font-size: 13px; color: var(--c-sub); }

/* 首页：底部 CTA */
.home-cta { margin-top: 44px; margin-bottom: -40px; background: linear-gradient(135deg, #0b2a52 0%, #0f6fd6 60%, #19c3c9 100%); color: #fff; }
.cta-inner { max-width: var(--maxw); margin: 0 auto; padding: 40px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.cta-inner h2 { margin: 0 0 6px; font-size: 22px; }
.cta-inner p { margin: 0; opacity: 0.92; }

/* 列表页 */
.list-wrap { max-width: var(--maxw); margin: 0 auto; }
.list-grid { display: grid; grid-template-columns: 230px minmax(0,1fr); gap: 28px; padding: 8px 16px 40px; }
.list-side { align-self: start; }
.cat-panel { border: 1px solid var(--c-line); border-radius: var(--radius); background: var(--c-bg-2); padding: 10px 12px; }
.cat-panel > summary { font-weight: 700; cursor: pointer; padding: 4px 0; }
.category-list { list-style: none; margin: 8px 0 0; padding: 0; }
.category-list li { margin: 2px 0; }
.category-list a { display: block; padding: 8px 10px; border-radius: 8px; color: var(--c-sub); }
.category-list li.active a, .category-list a:hover { background: #fff; color: var(--c-brand); font-weight: 600; box-shadow: 0 1px 4px rgba(20,40,80,0.06); }
.list-title { font-size: 26px; margin: 8px 0 6px; }
.cat-intro { color: var(--c-sub); margin: 0 0 16px; }
.item-list { list-style: none; margin: 0; padding: 0; }
.item-row { padding: 16px; border: 1px solid var(--c-line); border-radius: var(--radius); margin-bottom: 12px; }
.item-link { font-weight: 700; font-size: 17px; }
.item-cat { font-size: 12px; color: var(--c-brand); margin-left: 8px; }
.item-sum { margin: 6px 0 0; color: var(--c-sub); font-size: 14px; }

/* 详情页 */
.detail-grid { display: grid; grid-template-columns: minmax(0,1fr) 240px; gap: 32px;
  max-width: var(--maxw); margin: 0 auto; padding: 8px 16px 48px; }
.detail-body { min-width: 0; }
.detail-title { font-size: 28px; line-height: 1.3; margin: 6px 0 18px; }
.detail-body h2 { font-size: 21px; margin: 30px 0 12px; padding-bottom: 6px; border-bottom: 2px solid var(--c-bg-2); }
.detail-body h3 { font-size: 17px; margin: 20px 0 8px; }
.detail-body p { margin: 10px 0; }
.summary-block { background: var(--c-bg-2); border-left: 4px solid var(--c-brand);
  padding: 14px 16px; border-radius: 8px; margin: 0 0 16px; color: var(--c-ink); }
.detail-keywords { font-size: 13px; color: var(--c-sub); margin: 0 0 10px; }
.detail-keywords strong { color: var(--c-brand); }
.detail-time { display: block; font-size: 12px; color: var(--c-sub); margin: 0 0 18px; }
.detail-body blockquote { background: #fff7ef; border-left: 4px solid var(--c-accent);
  margin: 16px 0; padding: 12px 16px; border-radius: 8px; }
.conclusion { font-weight: 600; }
table.data { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 14px; }
table.data th, table.data td { border: 1px solid var(--c-line); padding: 9px 12px; text-align: left; }
table.data th { background: var(--c-bg-2); font-weight: 700; }
table.data tbody tr:nth-child(even) { background: #fafcff; }

.faq { margin: 22px 0; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 8px 14px; }
.faq details { border-bottom: 1px solid var(--c-line); padding: 10px 0; }
.faq details:last-child { border-bottom: none; }
.faq summary { cursor: pointer; font-weight: 600; }
.faq-a { padding: 8px 0 4px; color: var(--c-sub); }

.related-links { margin: 24px 0; padding: 16px; background: var(--c-bg-2); border-radius: var(--radius); }
.rel-title { font-size: 18px; margin: 0 0 10px; }
.rel-list { margin: 0; padding-left: 18px; }
.rel-list li { margin: 6px 0; }

.toc-aside { position: sticky; top: 88px; max-height: calc(100vh - 110px); overflow-y: auto; }
.toc-panel { border: 1px solid var(--c-line); border-radius: var(--radius); background: var(--c-bg-2); padding: 10px 12px; }
.toc-panel > summary { font-weight: 700; cursor: pointer; }
.toc-list { list-style: none; margin: 8px 0 0; padding: 0; }
.toc-list a { display: block; padding: 5px 0; color: var(--c-sub); font-size: 14px; }
.toc-lvl-3 a { padding-left: 14px; font-size: 13px; }
.toc-list a:hover { color: var(--c-brand); }

/* 页面 / 归档 / 404 */
.page-body { max-width: 860px; margin: 0 auto; padding: 8px 16px 48px; }
.page-title { font-size: 28px; margin: 8px 0 18px; }
.archive-wrap { max-width: var(--maxw); margin: 0 auto; padding: 8px 16px 48px; }
.archive-title { font-size: 28px; }
.arc-sub { font-size: 20px; margin: 20px 0 10px; }
.arc-list { list-style: none; padding: 0; }
.arc-list li { padding: 8px 0; border-bottom: 1px solid var(--c-line); }
.arc-cat { font-size: 12px; color: var(--c-brand); margin: 0 8px; }
.arc-date { font-size: 12px; color: var(--c-sub); }
.notfound { max-width: 600px; margin: 60px auto; text-align: center; padding: 0 16px; }
.nf-title { font-size: 64px; color: var(--c-brand); margin: 0; }
.nf-text { color: var(--c-sub); margin: 10px 0 22px; }

/* 页脚 */
.site-foot { background: #0e1726; color: #c7d3e6; margin-top: 40px; }
.foot-inner { max-width: var(--maxw); margin: 0 auto; padding: 28px 16px; }
.foot-brand { font-weight: 800; color: #fff; margin-bottom: 12px; }
.foot-nav { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 12px; }
.foot-nav a { color: #c7d3e6; font-size: 14px; }
.foot-meta, .foot-mail { font-size: 13px; color: #8aa0c0; margin: 4px 0; }
.foot-mail .js-email { color: #fff; }

/* 悬浮工具胶囊 */
.float-capsule {
  position: fixed; right: 16px; top: 50%; transform: translateY(-50%);
  display: flex; flex-direction: column; gap: 12px; z-index: 80;
}
.cap-item {
  width: 56px; height: 56px; border-radius: 28px; border: none; cursor: pointer;
  background: linear-gradient(160deg, var(--c-brand) 0%, var(--c-brand-2) 100%);
  color: #fff; display: flex; flex-direction: column; align-items: center; justify-content: center;
  box-shadow: 0 8px 22px rgba(15,111,214,0.35); font-size: 12px;
}
.cap-item:hover { transform: scale(1.05); }
.cap-ico { font-size: 18px; line-height: 1; }
.cap-txt { margin-top: 2px; }

.card-modal { position: fixed; inset: 0; z-index: 120; display: flex; align-items: center; justify-content: center; }
.card-modal[hidden] { display: none; }
.card-modal-mask { position: absolute; inset: 0; background: rgba(8,16,30,0.6); }
.card-modal-box { position: relative; background: #fff; border-radius: 12px; padding: 12px; }
.card-modal-box img { display: block; width: 300px; height: 500px; object-fit: contain; }
.card-close { display: block; margin: 10px auto 0; border: none; background: var(--c-brand); color: #fff;
  border-radius: 8px; padding: 8px 18px; cursor: pointer; }

/* 响应式：≤1024px 折叠导航与目录 */
@media (max-width: 1024px) {
  .nav-toggle { display: block; }
  .primary-nav { display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; background: #fff; border-bottom: 1px solid var(--c-line); padding: 10px 16px; }
  .primary-nav.nav-open { display: flex; }
  .nav-group { width: 100%; }
  .nav-sub { position: static; display: flex; box-shadow: none; border: none; padding: 0 0 0 12px; }
  .detail-grid { grid-template-columns: 1fr; }
  .toc-aside { position: static; max-height: none; order: -1; }
  .list-grid { grid-template-columns: 1fr; }
  .cat-cards { grid-template-columns: repeat(2, 1fr); }
  .hero-title { font-size: 26px; }
  .feat-cards { grid-template-columns: repeat(2, 1fr); }
  .home-intro-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .cat-cards { grid-template-columns: 1fr; }
  .feat-cards { grid-template-columns: 1fr; }
  .hero-stats { gap: 10px 22px; }
  .hero-stats b { font-size: 17px; }
  .float-capsule { right: 10px; gap: 8px; }
  .cap-item { width: 48px; height: 48px; font-size: 11px; }
}