/* =========================================================================
   YUTIAN — Inner Pages / Components
   集合页、详情页、应用页、归档页、通用页
   继承 style.css 的设计令牌（--green / --navy / --line 等）
   ========================================================================= */

/* ---------- 通用：面包屑 ---------- */
.breadcrumbs { font-size: 12px; color: var(--grey); margin-bottom: 14px; }
.breadcrumbs a { color: var(--grey); }
.breadcrumbs a:hover { color: var(--green-deep); }
.breadcrumbs .bc-sep { margin: 0 7px; color: #C3C8CD; }
.breadcrumbs .bc-cur { color: var(--ink); font-weight: 600; }

/* ---------- 通用：证书条 ---------- */
.cert-strip {
  display: flex; flex-wrap: wrap; gap: 10px; justify-content: center;
  padding: 20px; background: #fff; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}
.cert-badge {
  font-size: 11px; font-weight: 800; letter-spacing: .8px; color: var(--green-deep);
  background: var(--green-pale); border-radius: 3px; padding: 6px 13px; text-transform: uppercase;
}

/* ---------- 集合页：页壳 ---------- */
.coll-page { display: block; }

/* ---------- 通用：Hero ---------- */
.arch-hero, .coll-hero {
  background: linear-gradient(160deg, var(--navy) 0%, #182229 100%);
  color: #fff; padding: 52px 0 56px; position: relative; overflow: hidden;
}
.arch-hero::after, .coll-hero::after {
  content: ""; position: absolute; right: -60px; top: -40px; width: 400px; height: 340px;
  background-image: radial-gradient(rgba(140,198,63,.20) 1.4px, transparent 1.4px);
  background-size: 14px 14px; pointer-events: none;
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 70%);
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 70%);
}
.arch-hero .wrap, .coll-hero .wrap { position: relative; z-index: 1; }
.arch-hero .breadcrumbs, .coll-hero .breadcrumbs { color: #8C99A2; }
.arch-hero .breadcrumbs a, .coll-hero .breadcrumbs a { color: #8C99A2; }
.arch-hero .breadcrumbs .bc-cur, .coll-hero .breadcrumbs .bc-cur { color: var(--green); }
.arch-hero .eyebrow, .coll-hero .eyebrow { color: var(--green); }
.arch-hero h1, .coll-hero h1 { font-size: 36px; line-height: 1.2; font-weight: 800; max-width: 820px; }
.arch-hero .hero-answer, .coll-hero .hero-answer {
  color: #C4CDD3; font-size: 15px; line-height: 1.65; max-width: 780px; margin-top: 16px;
}

.coll-hero-grid { display: grid; grid-template-columns: 1fr 300px; gap: 40px; align-items: start; }
.coll-hero-copy { min-width: 0; }
.coll-hero h1 .h1-suffix { color: var(--green); display: block; font-size: 26px; margin-top: 4px; }
.coll-hero-actions { display: flex; gap: 12px; margin-top: 26px; flex-wrap: wrap; }
.updated-line { font-size: 11.5px; color: #7C8992; margin-top: 16px; }

/* Hero 侧栏事实卡 */
.coll-hero-side { position: relative; z-index: 1; }
.coll-facts {
  background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.12);
  border-radius: 8px; padding: 22px 24px; backdrop-filter: blur(4px);
}
.coll-facts h3 { font-size: 13px; letter-spacing: 1.4px; text-transform: uppercase; color: var(--green); margin-bottom: 16px; }
.coll-facts ul { list-style: none; }
.coll-facts li {
  display: flex; align-items: flex-start; gap: 9px;
  font-size: 12.5px; color: #D5DCE1; padding: 7px 0; line-height: 1.45;
}
.coll-facts li svg { flex: 0 0 14px; margin-top: 3px; color: var(--green); }

/* ---------- 集合页：综述 + 子类 ---------- */
.coll-intro-grid { display: grid; grid-template-columns: 1fr 330px; gap: 44px; align-items: start; }
.coll-intro-text h2 { font-size: 24px; margin-bottom: 18px; color: #1A1D21; }
.coll-intro-text p { color: #4A5056; font-size: 14.5px; line-height: 1.75; margin-bottom: 16px; }

.coll-subcats { background: var(--bg-soft); border-radius: 8px; padding: 24px; border: 1px solid var(--line); }
.coll-subcats h3 { font-size: 13px; letter-spacing: 1.2px; text-transform: uppercase; color: var(--ink); margin-bottom: 16px; }
.coll-subcats ul { list-style: none; }
.coll-subcats li { border-bottom: 1px solid var(--line); }
.coll-subcats li:last-child { border-bottom: none; }
.coll-subcats a { display: block; padding: 11px 0; }
.coll-subcats a:hover b { color: var(--green-deep); }
.coll-subcats b { display: block; font-size: 13px; color: var(--ink); margin-bottom: 3px; }
.coll-subcats span { display: block; font-size: 11.5px; color: var(--grey); line-height: 1.45; }

/* ---------- 产品卡片网格 ---------- */
.pc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.pc-grid-4 { grid-template-columns: repeat(4, 1fr); }
.pc {
  background: #fff; border: 1px solid var(--line); border-radius: 7px; overflow: hidden;
  display: flex; flex-direction: column; transition: all .25s;
}
.pc:hover { box-shadow: 0 16px 34px rgba(0,0,0,.11); transform: translateY(-4px); border-color: #DDE2D2; }
.pc-thumb { position: relative; height: 190px; background: #F1F3EE; overflow: hidden; }
.pc-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.pc:hover .pc-thumb img { transform: scale(1.05); }
.pc-ph { position: absolute; inset: 0; display: flex; align-items: center; justify-content: center; color: #B7C2A8; }
.pc-cat {
  position: absolute; left: 10px; top: 10px; font-size: 9.5px; font-weight: 800;
  letter-spacing: .6px; text-transform: uppercase; background: rgba(30,42,50,.86);
  color: #fff; padding: 4px 9px; border-radius: 3px; backdrop-filter: blur(3px);
}
.pc-body { padding: 16px 17px 18px; display: flex; flex-direction: column; flex: 1; }
.pc-body h3 { font-size: 14px; font-weight: 700; line-height: 1.4; margin-bottom: 8px; color: #1A1D21; }
.pc-body p { font-size: 12px; color: var(--grey); line-height: 1.55; flex: 1; margin-bottom: 12px; }
.pc-more {
  font-size: 11px; font-weight: 800; letter-spacing: .6px; color: var(--green-deep);
  display: inline-flex; align-items: center; gap: 5px; text-transform: uppercase;
}
.pc:hover .pc-more { gap: 9px; }

.empty-state { text-align: center; padding: 50px 20px; color: var(--grey); font-size: 14px; }
.empty-state a { color: var(--green-deep); font-weight: 700; }

/* 分页 */
.pagination { margin-top: 36px; }
.pagination ul { display: flex; gap: 7px; list-style: none; justify-content: center; flex-wrap: wrap; }
.pagination a, .pagination span {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 38px; height: 38px; padding: 0 12px; border: 1px solid var(--line);
  border-radius: 5px; font-size: 13px; font-weight: 600; color: var(--ink); background: #fff;
}
.pagination a:hover { border-color: var(--green); color: var(--green-deep); }
.pagination .current { background: var(--green); border-color: var(--green); color: #fff; }

/* ---------- 关键能力 ---------- */
.caps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px 30px; }
.coll-caps { background: #fff; }
.cap-item { display: flex; gap: 14px; }
.cap-ico {
  flex: 0 0 46px; width: 46px; height: 46px; border-radius: 10px;
  background: var(--green-pale); color: var(--green-deep);
  display: flex; align-items: center; justify-content: center;
}
.cap-item b { display: block; font-size: 13.5px; margin-bottom: 4px; color: #1A1D21; }
.cap-item span { font-size: 12px; color: var(--grey); line-height: 1.5; }

/* ---------- FAQ ---------- */
.faq-section h2 { font-size: 24px; margin-bottom: 22px; color: #1A1D21; }
.faq-list { border-top: 1px solid var(--line); }
.faq-item { border-bottom: 1px solid var(--line); }
.faq-item summary {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px 4px; cursor: pointer; list-style: none; font-size: 14.5px; font-weight: 700; color: var(--ink);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-ico { flex: 0 0 16px; color: var(--green-deep); transition: transform .25s; }
.faq-item[open] .faq-ico { transform: rotate(90deg); }
.faq-body { padding: 0 4px 20px; color: #4A5056; font-size: 13.5px; line-height: 1.7; }
.faq-body p { margin-bottom: 10px; }

/* ---------- 询盘 CTA ---------- */
.ask-cta { background: var(--green); }
.ask-inner { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 40px 20px; flex-wrap: wrap; }
.ask-cta h2 { font-size: 22px; color: #fff; margin-bottom: 8px; }
.ask-cta p { color: #F0F8E2; font-size: 13px; max-width: 480px; }
.ask-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.ask-cta .btn-line { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,.7); }
.ask-cta .btn-line:hover { background: rgba(255,255,255,.15); }

/* ---------- 产品详情页 ---------- */
.prod-page { display: block; }
.prod-crumb-bar { background: #fff; border-bottom: 1px solid var(--line); }
.prod-crumb-bar .wrap { padding-top: 16px; padding-bottom: 16px; }
.prod-crumb-bar .breadcrumbs { margin-bottom: 0; }

.prod-hero { padding: 46px 0 50px; background: #fff; }
.prod-hero-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }

.prod-gallery { position: sticky; top: 96px; }
.pg-main {
  border: 1px solid var(--line); border-radius: 8px; overflow: hidden;
  background: #F5F7F2; aspect-ratio: 4 / 3; display: flex; align-items: center; justify-content: center;
}
.pg-main img { width: 100%; height: 100%; object-fit: cover; }
.pg-ph { color: #B7C2A8; }
.pg-thumbs { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.pg-thumb {
  width: 72px; height: 72px; border-radius: 6px; overflow: hidden;
  border: 2px solid var(--line); background: #F5F7F2; cursor: pointer; padding: 0;
}
.pg-thumb.is-active { border-color: var(--green); }
.pg-thumb img { width: 100%; height: 100%; object-fit: cover; }

.prod-summary h1 { font-size: 30px; line-height: 1.25; color: #1A1D21; margin-bottom: 14px; }
.prod-summary .eyebrow { color: var(--green-deep); margin-bottom: 10px; }
.prod-summary .hero-answer {
  font-size: 14.5px; line-height: 1.7; color: #4A5056; margin-bottom: 22px;
  padding-left: 15px; border-left: 3px solid var(--green);
}
.prod-quickfacts { list-style: none; margin-bottom: 26px; }
.prod-quickfacts li {
  display: flex; align-items: center; gap: 9px; font-size: 13px; color: #40464C;
  padding: 8px 0; border-bottom: 1px solid #F1F3F0;
}
.prod-quickfacts li:last-child { border-bottom: none; }
.prod-quickfacts svg { color: var(--green-deep); flex: 0 0 14px; }
.prod-quickfacts b { color: var(--ink); }
.prod-cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 20px; }
.prod-contact-inline {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-size: 12.5px; color: var(--grey); padding-top: 18px; border-top: 1px solid var(--line);
}
.prod-contact-inline svg { color: var(--green-deep); }
.prod-contact-inline a { color: var(--ink); font-weight: 600; }
.prod-contact-inline a:hover { color: var(--green-deep); }
.prod-contact-inline .sep { color: #D5D9DD; }

/* 规格表 */
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; position: relative; }
.spec-table { width: 100%; border-collapse: collapse; font-size: 13.5px; min-width: 680px; }
.spec-table thead th {
  background: var(--navy); color: #fff; font-size: 11.5px; font-weight: 700;
  letter-spacing: .5px; text-transform: uppercase; padding: 14px 16px; text-align: left; white-space: nowrap;
}
.spec-table tbody td { padding: 12px 16px; border-bottom: 1px solid var(--line); color: #40464C; white-space: nowrap; }
.spec-table tbody tr:nth-child(even) { background: #FAFBF9; }
.spec-table tbody tr:last-child td { border-bottom: none; }
.spec-table tbody td:first-child { font-weight: 700; color: var(--ink); }

/* 技术参数 */
.tech-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 40px; }
.tech-row { display: flex; justify-content: space-between; gap: 20px; padding: 13px 2px; border-bottom: 1px solid var(--line); }
.tech-prop { font-size: 13px; color: var(--grey); font-weight: 600; }
.tech-val { font-size: 13px; color: var(--ink); font-weight: 700; text-align: right; }

/* 详情页正文 */
.prod-body h2 { font-size: 22px; margin: 30px 0 14px; color: #1A1D21; }
.prod-body h3 { font-size: 17px; margin: 24px 0 10px; color: #1A1D21; }
.prod-body p, .prod-body li { font-size: 14.5px; line-height: 1.75; color: #4A5056; margin-bottom: 14px; }
.prod-body ul, .prod-body ol { padding-left: 22px; margin-bottom: 16px; }
.prod-body img { border-radius: 8px; margin: 16px 0; }
.prod-body table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 13.5px; }
.prod-body th, .prod-body td { border: 1px solid var(--line); padding: 10px 13px; text-align: left; }
.prod-body th { background: var(--bg-soft); font-weight: 700; }
.wrap-narrow { max-width: 860px; }

/* 优势 */
.adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.adv-item { border-top: 2px solid var(--green); padding-top: 18px; }
.adv-num { display: block; font-size: 22px; font-weight: 800; color: #DDE4D2; margin-bottom: 8px; }
.adv-item b { display: block; font-size: 14px; margin-bottom: 6px; color: #1A1D21; }
.adv-item span { font-size: 12.5px; color: var(--grey); line-height: 1.55; }

/* 认证 + 应用 */
.cert-app-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: start; }
.cert-panel h2, .app-panel h2 { font-size: 21px; margin-bottom: 20px; color: #1A1D21; }
.cert-panel ul { list-style: none; }
.cert-panel li {
  display: flex; gap: 12px; align-items: flex-start; padding: 12px 0; border-bottom: 1px solid var(--line);
}
.cert-panel li:last-child { border-bottom: none; }
.cert-panel svg { color: var(--green-deep); flex: 0 0 17px; margin-top: 2px; }
.cert-panel b { display: block; font-size: 13.5px; color: var(--ink); }
.cert-panel span { font-size: 11.5px; color: var(--grey); }

.app-chips { display: flex; flex-wrap: wrap; gap: 10px; }
.app-chips a {
  display: inline-flex; align-items: center; gap: 7px; font-size: 12.5px; font-weight: 600;
  color: var(--ink); background: var(--bg-soft); border: 1px solid var(--line);
  border-radius: 20px; padding: 9px 16px; transition: all .2s;
}
.app-chips a:hover { background: var(--green); color: #fff; border-color: var(--green); }
.app-chips svg { color: var(--green-deep); }
.app-chips a:hover svg { color: #fff; }

/* 案例 */
.case-box { background: #fff; border-left: 4px solid var(--green); border-radius: 0 8px 8px 0; padding: 28px 32px; box-shadow: 0 8px 24px rgba(0,0,0,.05); }
.case-label { font-size: 10.5px; font-weight: 800; letter-spacing: 1.6px; color: var(--green-deep); display: block; margin-bottom: 12px; }
.case-box p { color: #40464C; font-size: 14.5px; line-height: 1.75; }

/* 下载 */
.dl-list { display: flex; flex-direction: column; gap: 10px; margin-top: 20px; }
.dl-item {
  display: flex; align-items: center; gap: 13px; padding: 15px 20px;
  border: 1px solid var(--line); border-radius: 7px; background: #fff;
  font-size: 13.5px; font-weight: 600; color: var(--ink); transition: all .2s;
}
.dl-item:hover { border-color: var(--green); background: var(--green-pale); }
.dl-item span { flex: 1; }
.dl-item svg:first-child { color: var(--green-deep); }
.dl-item svg:last-child { color: var(--grey); }

.back-to-coll { margin-top: 30px; font-size: 13px; color: var(--grey); }
.back-to-coll a { color: var(--green-deep); font-weight: 700; }

/* ---------- 归档页：集合卡片 ---------- */
.coll-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.coll-card {
  background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 26px 24px;
  transition: all .25s; display: flex; flex-direction: column;
}
.coll-card:hover { box-shadow: 0 16px 34px rgba(0,0,0,.1); transform: translateY(-4px); border-color: #DDE2D2; }
.coll-card-ico {
  width: 48px; height: 48px; border-radius: 11px; background: var(--green-pale);
  color: var(--green-deep); display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
}
.coll-card h3 { font-size: 15.5px; color: #1A1D21; margin-bottom: 7px; line-height: 1.35; }
.coll-card-count { font-size: 11.5px; color: var(--grey); margin-bottom: 16px; }
.coll-card-more {
  font-size: 11px; font-weight: 800; letter-spacing: .6px; color: var(--green-deep);
  display: inline-flex; align-items: center; gap: 5px; text-transform: uppercase; margin-top: auto;
}

/* ---------- 应用页卡片 ---------- */
.app-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.app-card { background: #fff; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; transition: all .25s; display: flex; flex-direction: column; }
.app-card:hover { box-shadow: 0 16px 34px rgba(0,0,0,.1); transform: translateY(-4px); }
.app-card-thumb { height: 165px; background: #EDF1E8; display: flex; align-items: center; justify-content: center; }
.app-card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.app-card-ph { color: #B7C2A8; }
.app-card-body { padding: 18px 20px 20px; display: flex; flex-direction: column; flex: 1; }
.app-card-body b { font-size: 15px; color: #1A1D21; margin-bottom: 8px; }
.app-card-body > span:not(.app-card-more) { font-size: 12.5px; color: var(--grey); line-height: 1.55; flex: 1; margin-bottom: 14px; }
.app-card-more { font-size: 11px; font-weight: 800; letter-spacing: .6px; color: var(--green-deep); display: inline-flex; align-items: center; gap: 5px; text-transform: uppercase; }

/* 应用详情：挑战网格 */
.chal-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.chal-item { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 24px; }
.chal-item b { display: block; font-size: 14px; color: #1A1D21; margin-bottom: 10px; }
.chal-item b::before { content: ""; display: block; width: 26px; height: 3px; background: var(--green); border-radius: 2px; margin-bottom: 11px; }
.chal-item span { font-size: 12.5px; color: var(--grey); line-height: 1.6; }

/* ---------- 通用页面 ---------- */
.page-default .arch-hero h1 { font-size: 34px; }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 44px; align-items: start; }
.contact-info h3 {
  font-size: 13px; letter-spacing: 1.4px; text-transform: uppercase;
  color: var(--green-deep); margin-bottom: 12px;
}
.contact-info p { font-size: 14.5px; line-height: 1.7; color: #40464C; }
.contact-lines { list-style: none; margin-top: 20px; }
.contact-lines li { display: flex; align-items: center; gap: 11px; font-size: 13.5px; color: #40464C; padding: 9px 0; }
.contact-lines svg { color: var(--green-deep); flex: 0 0 16px; }
.contact-lines a { color: var(--ink); font-weight: 600; }
.contact-lines a:hover { color: var(--green-deep); }
.contact-form-wrap { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 28px; }
.contact-form input, .contact-form textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--line); border-radius: 5px;
  margin-bottom: 14px; font-size: 14px; font-family: inherit; background: #fff;
}
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: var(--green); }
.contact-form .btn { width: 100%; justify-content: center; }

/* ---------- 博客 / 知识中心 ---------- */
.post-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.post-card { background: #fff; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; transition: all .25s; display: flex; flex-direction: column; }
.post-card:hover { box-shadow: 0 14px 30px rgba(0,0,0,.1); transform: translateY(-4px); }
.post-thumb { height: 175px; background: #EDF1E8; }
.post-thumb img { width: 100%; height: 100%; object-fit: cover; }
.post-body { padding: 18px 20px 22px; display: flex; flex-direction: column; }
.post-body time { font-size: 11px; color: var(--green-deep); font-weight: 700; letter-spacing: .5px; margin-bottom: 9px; }
.post-body b { font-size: 14.5px; color: #1A1D21; line-height: 1.45; margin-bottom: 9px; }
.post-body span { font-size: 12.5px; color: var(--grey); line-height: 1.55; }

/* ---------- 404 ---------- */
.page-404 { padding: 90px 0 100px; text-align: center; }
.e404 { display: block; font-size: 84px; font-weight: 800; color: var(--green); line-height: 1; margin-bottom: 12px; }
.page-404 h1 { font-size: 28px; color: #1A1D21; margin-bottom: 14px; }
.page-404 p { color: var(--grey); font-size: 14px; margin-bottom: 28px; }
.e404-links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 30px; }
.e404-search { max-width: 380px; margin: 0 auto; }
.e404-search input[type="search"], .e404-search input[type="text"] {
  width: 100%; padding: 12px 15px; border: 1px solid var(--line); border-radius: 5px; font-size: 14px;
}

/* ---------- 头部增强 ---------- */
.skip-link {
  position: absolute; left: -9999px; top: 0; background: var(--green); color: #fff;
  padding: 10px 18px; z-index: 999; font-size: 13px; font-weight: 700;
}
.skip-link:focus { left: 0; }
.header-cta { white-space: nowrap; }
.lang { display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; font-weight: 700; color: var(--ink); }
.lang svg { color: var(--green-deep); }
.nav-toggle { display: none; flex-direction: column; gap: 4px; background: none; border: none; cursor: pointer; padding: 8px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); border-radius: 2px; }
.mobile-nav { display: none; }
.mobile-nav[hidden] { display: none; }

/* 主菜单二级下拉（WP 后台配置时生效）
   注意：必须用 > 限定直接层级，否则 .mega-col ul 也会被当成
   「ul 里的 ul」而整块隐藏（mega 条目消失的元凶）。 */
.main-nav > ul > li { position: relative; }
.main-nav > ul > li > ul {
  position: absolute; left: 0; top: 100%; min-width: 240px; background: #fff;
  border: 1px solid var(--line); border-radius: 6px; box-shadow: 0 14px 34px rgba(0,0,0,.13);
  padding: 8px; display: none; z-index: 200;
}
.main-nav > ul > li:hover > ul { display: block; }
.main-nav > ul > li > ul > li { display: block; }
.main-nav > ul > li > ul a { display: block; padding: 9px 13px; font-size: 13px; font-weight: 500; border-radius: 4px; }
.main-nav > ul > li > ul a:hover { background: var(--green-pale); color: var(--green-deep); }
.main-nav > ul > li > ul a::after { display: none; }

/* ---------- 主菜单 mega 下拉 ----------
 * 定位策略：面板不再以单个 <li> 为基准居中（窄 li + 宽面板必然左右溢出），
 * 改为 fixed 全宽面板、内容用 max-width:1180px 居中，向上贴齐头部下沿。
 * 这样面板"长在导航条身上"，而不是"悬浮在网页上"。
 * ---------------------------------------------------------------------- */
.main-nav { position: relative; }
.nav-root { list-style: none; }
.nav-item { position: static; }
.nav-item > a {
  display: inline-flex; align-items: center; gap: 5px; white-space: nowrap;
}
.nav-caret { transition: transform .18s ease; opacity: .6; }
.nav-item.has-mega:hover > a .nav-caret,
.nav-item.has-mega:focus-within > a .nav-caret { transform: rotate(180deg); }

/* 面板本体：全宽下拉，贴住头部底边 */
.mega {
  position: fixed; left: 0; right: 0; top: var(--header-h);
  padding: 0; display: none; z-index: 300;
}
.nav-item.has-mega:hover > .mega,
.nav-item.has-mega:focus-within > .mega,
.nav-item.has-mega.is-open > .mega { display: block; }

/* 面板内容：与 .wrap 同宽居中，视觉上仍是一块卡片，但不是浮动游离的 */
.mega-inner {
  max-width: 1180px; margin: 0 auto;
  max-height: calc(100vh - var(--header-h) - 16px); overflow-y: auto;
  background: #fff; border: 1px solid var(--line); border-top: none;
  border-radius: 0 0 10px 10px;
  box-shadow: 0 18px 40px rgba(16,24,32,.13);
  padding: 24px 20px 0; display: flex; flex-wrap: wrap;
  gap: 20px 30px; align-items: flex-start;
}
.mega-col { min-width: 0; flex: 1 1 0; padding-bottom: 20px; }
/* style.css 的 .main-nav ul 是 display:flex（一级导航用），
   会误伤 mega 内部列表，这里改回块级纵向排列 */
.mega-col ul { display: block; list-style: none; }
.mega-title {
  display: block; font-size: 10.5px; font-weight: 800; letter-spacing: 1.3px;
  text-transform: uppercase; color: var(--green-deep); margin-bottom: 10px;
}
.mega-col ul { list-style: none; }
.mega-col li { margin-bottom: 2px; }
.mega-col a {
  display: block; padding: 6px 9px; margin-left: -9px; border-radius: 4px;
  font-size: 13px; font-weight: 500; color: #3D444B; white-space: nowrap;
  transition: background .15s ease, color .15s ease;
}
.mega-col a:hover { background: var(--green-pale); color: var(--green-deep); }
.mega-foot {
  flex: 0 0 100%; border-top: 1px solid var(--line); margin: 0 -20px; padding: 12px 20px;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  font-size: 11.5px; color: var(--grey); background: var(--bg-soft);
  border-radius: 0 0 10px 10px;
  position: sticky; bottom: 0;
}
.mega-all { font-weight: 700; color: var(--green-deep); white-space: nowrap; }
.mega-all:hover { color: var(--ink); }

/* 中窄桌面（1081–1200px）：压缩列间距与字号，保证最多 4 列仍不挤不换行 */
@media (min-width: 1081px) and (max-width: 1200px) {
  .mega-inner { gap: 18px 20px; padding: 20px 20px 0; }
  .mega-foot { margin: 0 -20px; padding: 11px 20px; }
  .mega-col a { font-size: 12.5px; }
}
/* 下拉遮罩：下压页面内容，强化"面板属于导航"的层次，避免与 hero 混淆 */
.mega-veil {
  position: fixed; inset: var(--header-h) 0 0; background: rgba(16,24,32,.32);
  opacity: 0; visibility: hidden; transition: opacity .2s ease, visibility .2s ease;
  z-index: 290;
}
body.mega-open .mega-veil { opacity: 1; visibility: visible; }

/* ---------- 容器壳类（仅作语义容器，子元素承担样式） ---------- */
.coll-intro { display: block; }
.app-detail-page { display: block; }
.arch-page { display: block; }
.inquiry-form { display: block; }
.contact-page { display: block; }

/* ---------- 内链矩阵（正文底部"继续探索"） ---------- */
.rel-links { background: var(--bg-soft); border-top: 1px solid var(--line); padding: 52px 0 56px; }
.rel-title {
  font-size: 13px; font-weight: 800; letter-spacing: 1.6px; text-transform: uppercase;
  color: var(--green-deep); margin-bottom: 22px;
}
.rel-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.rel-col h3 {
  display: flex; align-items: center; gap: 8px;
  font-size: 14.5px; font-weight: 700; color: #1A1D21; margin-bottom: 14px;
  padding-bottom: 11px; border-bottom: 2px solid var(--green);
}
.rel-col h3 svg { color: var(--green-deep); }
.rel-col ul { list-style: none; }
.rel-col li { margin-bottom: 3px; }
.rel-col a {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 8px 0; font-size: 13.5px; color: #40464C;
  border-bottom: 1px dashed rgba(0,0,0,.07);
  transition: color .15s ease, padding-left .15s ease;
}
.rel-col a:hover { color: var(--green-deep); padding-left: 5px; }
.rel-col a svg { flex: 0 0 auto; opacity: .35; }
.rel-col a:hover svg { opacity: 1; }

/* ---------- 网站地图页 ---------- */
.sm-single { display: flex; gap: 14px; flex-wrap: wrap; }
.sm-util { display: flex; gap: 10px 26px; flex-wrap: wrap; }
.sm-util a {
  font-size: 13.5px; font-weight: 600; color: var(--green-deep);
  padding: 8px 0; border-bottom: 1px solid transparent;
  transition: border-color .15s ease;
}
.sm-util a:hover { border-bottom-color: var(--green); }
.sec-head h2 a { color: inherit; }
.sec-head h2 a:hover { color: var(--green-deep); }

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .coll-hero-grid, .coll-intro-grid, .prod-hero-grid, .cert-app-grid { grid-template-columns: 1fr; }
  .prod-gallery { position: static; }
  .pc-grid, .pc-grid-4 { grid-template-columns: repeat(3, 1fr); }
  .coll-cards, .app-cards, .post-grid, .adv-grid, .chal-grid, .caps-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 30px; }
  .tech-grid { grid-template-columns: 1fr; }
  .header-cta, .lang { display: none; }
  .main-nav { display: none; }
  .nav-toggle { display: flex; }
  .mobile-nav {
    display: block; background: #fff; border-top: 1px solid var(--line);
    padding: 16px 20px 24px; max-height: 76vh; overflow-y: auto;
  }
  .mobile-nav ul { list-style: none; }
  .mobile-nav > ul > li > a {
    display: block; padding: 14px 2px; font-size: 15px; font-weight: 700;
    border-bottom: 1px solid var(--line); color: var(--ink);
  }
  .mobile-nav ul ul { padding-left: 14px; }
  .mobile-nav ul ul a { display: block; padding: 10px 2px; font-size: 13.5px; color: var(--grey); }
  .mobile-nav .btn { width: 100%; justify-content: center; margin-top: 18px; }
  body.nav-open { overflow: hidden; }
  .rel-grid { grid-template-columns: 1fr; gap: 22px; }
  .mega { display: none !important; }
  .mega-veil { display: none !important; }
  body.mega-open { overflow: auto; }
}

@media (max-width: 720px) {
  .arch-hero h1, .coll-hero h1 { font-size: 27px; }
  .coll-hero h1 .h1-suffix { font-size: 20px; }
  .prod-summary h1 { font-size: 24px; }
  .pc-grid, .pc-grid-4 { grid-template-columns: repeat(2, 1fr); }
  .coll-cards, .app-cards, .post-grid, .adv-grid, .chal-grid, .caps-grid, .contact-grid { grid-template-columns: 1fr; }
  .ask-inner { flex-direction: column; align-items: flex-start; }
  .pg-main { aspect-ratio: 3 / 2; }
  /* 规格表转卡片式（小屏） */
  .spec-table { min-width: 0; }
  .spec-table thead { display: none; }
  .spec-table tbody tr { display: block; border-bottom: 1px solid var(--line); padding: 8px 0; }
  .spec-table tbody td { display: flex; justify-content: space-between; border: none; padding: 6px 14px; white-space: normal; }
  .spec-table tbody td::before { content: attr(data-th); font-weight: 600; color: var(--grey); font-size: 12px; }
}