/* ==========================================================================
   四维电子（SWEI）站点级共享样式
   设计语言：工业深蓝底 + 橙色强调，工程感排版，克制的边框与留白。
   全站禁止内联样式，所有页面共用本文件中的类名。
   ========================================================================== */

:root {
  --c-navy: #0c2340;
  --c-navy-2: #143a63;
  --c-navy-3: #1d4f86;
  --c-accent: #f2710c;
  --c-accent-dark: #d15c00;
  --c-accent-soft: #fff1e4;
  --c-link: #16537e;
  --c-text: #1b2733;
  --c-muted: #5d6d7e;
  --c-line: #dde5ee;
  --c-line-soft: #eaeff5;
  --c-bg: #ffffff;
  --c-bg-soft: #f4f7fa;
  --c-bg-soft-2: #eef3f8;
  --radius: 6px;
  --radius-lg: 10px;
  --wrap: 1180px;
  --shadow-sm: 0 1px 2px rgba(12, 35, 64, .06);
  --shadow: 0 10px 30px rgba(12, 35, 64, .08);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

img { max-width: 100%; height: auto; border: 0; }

a { color: var(--c-link); text-decoration: none; }
a:hover { color: var(--c-accent-dark); }

h1, h2, h3, h4 { margin: 0 0 .6em; line-height: 1.35; color: var(--c-navy); font-weight: 700; }
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }

ul, ol { margin: 0 0 1em; padding-left: 1.25em; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 20px; }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 99;
  background: var(--c-navy); color: #fff; padding: 10px 16px;
}
.skip-link:focus { left: 0; }

/* ---------- 页头（顶部固定：滚动时始终停留在视口顶部） ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: #fff;
  border-bottom: 3px solid var(--c-accent);
  box-shadow: 0 2px 10px rgba(12, 35, 64, .08);
}

.topbar { padding: 14px 0; }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; }
.brand img { width: 260px; height: auto; display: block; }

.topbar-aside { display: flex; flex-direction: column; align-items: flex-end; gap: 6px; }
.topbar-hotline { font-size: .95rem; font-weight: 700; color: var(--c-navy); }
.topbar-hotline b { color: var(--c-accent-dark); font-size: 1.12rem; letter-spacing: .02em; }
.topbar-links { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: .86rem; }
.topbar-links a { color: var(--c-muted); }
.topbar-links a:hover { color: var(--c-accent-dark); }

.nav-bar { background: var(--c-navy); }
.nav-list { display: flex; flex-wrap: wrap; align-items: stretch; list-style: none; margin: 0; padding: 0; }
.nav-item { position: relative; }
.nav-item > a {
  display: block; padding: 14px 20px; color: #e8eef6; font-size: .98rem; font-weight: 600;
  border-bottom: 3px solid transparent;
}
.nav-item > a:hover { color: #fff; background: var(--c-navy-2); }
.nav-item.is-current > a { color: #fff; border-bottom-color: var(--c-accent); background: rgba(255, 255, 255, .06); }

.nav-toggle {
  display: none; width: 100%; text-align: left; background: none; border: 0;
  font: inherit; font-weight: 600; color: #e8eef6; padding: 14px 20px; cursor: pointer;
}

.sub-nav {
  position: absolute; left: 0; top: 100%; z-index: 30; min-width: 208px;
  list-style: none; margin: 0; padding: 6px 0; background: #fff;
  border: 1px solid var(--c-line); border-top: 3px solid var(--c-accent);
  box-shadow: var(--shadow); display: none;
}
.nav-item.has-sub:hover > .sub-nav,
.nav-item.has-sub:focus-within > .sub-nav { display: block; }
.sub-nav a { display: block; padding: 8px 16px; color: var(--c-text); font-size: .92rem; }
.sub-nav a:hover { background: var(--c-bg-soft); color: var(--c-accent-dark); }

/* 移动端：点击展开 */
.nav-open > .sub-nav { display: block; position: static; border: 0; box-shadow: none; background: var(--c-navy-2); padding: 4px 0; }
.nav-open > .sub-nav a { color: #dce6f1; }
.nav-open > .sub-nav a:hover { background: var(--c-navy-3); color: #fff; }

/* 移动端菜单按钮：仅窄屏显示（由脚本注入，桌面端隐藏） */
.nav-menu-btn {
  display: none; align-items: center; gap: 10px; width: 100%;
  padding: 13px 20px; background: none; border: 0; cursor: pointer;
  font: inherit; font-size: 1rem; font-weight: 700; color: #fff;
}
.nav-menu-btn .nav-menu-icon {
  display: block; width: 20px; height: 2px; background: var(--c-accent);
  box-shadow: 0 -6px 0 var(--c-accent), 0 6px 0 var(--c-accent);
}
.nav-menu-btn .nav-menu-text { font-size: .92rem; font-weight: 700; color: #fff; }

/* ---------- 通用板块 ---------- */
.band { padding: 52px 0; }
.band-soft { background: var(--c-bg-soft); }
.band-line { border-top: 1px solid var(--c-line-soft); }

.section-head { margin-bottom: 28px; }
.section-head h2 { margin: 0 0 6px; font-size: 1.5rem; }
.section-head p { margin: 0; color: var(--c-muted); font-size: .95rem; }
.section-head-row { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.section-more { font-size: .9rem; font-weight: 600; }

/* 面包屑 */
.crumbs { background: var(--c-bg-soft-2); border-bottom: 1px solid var(--c-line); font-size: .88rem; }
.crumbs-inner { padding: 12px 0; color: var(--c-muted); }
.crumbs a { color: var(--c-muted); }
.crumbs a:hover { color: var(--c-accent-dark); }
.crumbs .sep { margin: 0 8px; color: #9aa9b8; }
.crumbs .here { color: var(--c-navy); font-weight: 600; }

/* 按钮 */
.btn {
  display: inline-block; padding: 12px 26px; border-radius: var(--radius);
  font-size: .96rem; font-weight: 700; text-align: center; cursor: pointer;
  border: 1px solid transparent; transition: background-color .15s ease, color .15s ease;
}
.btn-primary { background: var(--c-accent); color: #fff; }
.btn-primary:hover { background: var(--c-accent-dark); color: #fff; }
.btn-outline { background: transparent; color: #fff; border-color: rgba(255, 255, 255, .55); }
.btn-outline:hover { background: rgba(255, 255, 255, .12); color: #fff; }
.btn-ghost { background: #fff; color: var(--c-navy); border-color: var(--c-line); }
.btn-ghost:hover { border-color: var(--c-accent); color: var(--c-accent-dark); }
.btn[disabled] { opacity: .6; cursor: not-allowed; }

/* ---------- 卡片 ---------- */
.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  display: flex; flex-direction: column; background: #fff; border: 1px solid var(--c-line);
  border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-sm);
}
.card:hover { border-color: #c8d6e4; box-shadow: var(--shadow); }
.card-media { display: block; background: var(--c-bg-soft); }
.card-media img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.card-body { padding: 18px 20px 20px; }
.card-body h3 { margin: 0 0 8px; font-size: 1.06rem; }
.card-body h3 a { color: var(--c-navy); }
.card-body h3 a:hover { color: var(--c-accent-dark); }
.card-body p { margin: 0; color: var(--c-muted); font-size: .92rem; }
.card-tag {
  display: inline-block; margin-bottom: 10px; padding: 2px 10px; border-radius: 999px;
  background: var(--c-accent-soft); color: var(--c-accent-dark); font-size: .78rem; font-weight: 700;
}

/* 图文条目 */
.media-row { display: flex; gap: 18px; align-items: flex-start; }
.media-row .media { flex: 0 0 168px; }
.media-row .media img { border-radius: var(--radius); display: block; width: 100%; }
.media-row .media-body { flex: 1 1 auto; }

/* ---------- 条目列表 ---------- */
.entry-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--c-line-soft); }
.entry-item { display: flex; gap: 14px; align-items: baseline; padding: 15px 2px; border-bottom: 1px solid var(--c-line-soft); }
.entry-item .entry-date { flex: 0 0 96px; color: var(--c-muted); font-size: .88rem; font-variant-numeric: tabular-nums; }
.entry-item .entry-title { flex: 1 1 auto; }
.entry-item .entry-title a { color: var(--c-text); font-weight: 600; }
.entry-item .entry-title a:hover { color: var(--c-accent-dark); }
.entry-item .entry-note { display: block; margin-top: 4px; color: var(--c-muted); font-size: .88rem; font-weight: 400; }

/* ---------- 图片墙 ---------- */
.gallery { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; list-style: none; margin: 0; padding: 0; }
.gallery-item { margin: 0; background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); overflow: hidden; }
.gallery-item img { display: block; width: 100%; aspect-ratio: 4 / 3; object-fit: cover; background: var(--c-bg-soft); }
.gallery-item figcaption { padding: 10px 12px; font-size: .88rem; color: var(--c-muted); }

/* ---------- 正文排版 ---------- */
.prose { max-width: 860px; }
.prose h2 { margin: 1.8em 0 .6em; font-size: 1.28rem; padding-left: 12px; border-left: 4px solid var(--c-accent); }
.prose h3 { margin: 1.4em 0 .5em; font-size: 1.08rem; color: var(--c-navy-2); }
.prose p { margin: 0 0 1.1em; }
.prose li { margin-bottom: .4em; }
.prose img { border-radius: var(--radius); display: block; margin: 0 0 1em; }
.prose figure { margin: 0 0 1.4em; }
.prose figcaption { color: var(--c-muted); font-size: .86rem; margin-top: 6px; }
.prose .lead { font-size: 1.06rem; color: var(--c-muted); }

.article-meta { display: flex; flex-wrap: wrap; gap: 6px 18px; color: var(--c-muted); font-size: .88rem; margin-bottom: 20px; }
.article-nav { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 34px; padding-top: 18px; border-top: 1px solid var(--c-line-soft); font-size: .92rem; }

/* ---------- 事实清单 ---------- */
.fact-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.fact-list li { display: flex; gap: 14px; padding: 10px 0; border-bottom: 1px dashed var(--c-line); font-size: .95rem; }
.fact-list .fact-key { flex: 0 0 108px; color: var(--c-muted); }

/* ---------- 数据条 ---------- */
.stat-row { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.stat { padding: 18px; border-left: 3px solid var(--c-accent); background: rgba(255, 255, 255, .07); }
.stat .stat-num { display: block; font-size: 1.6rem; font-weight: 700; color: #fff; line-height: 1.2; }
.stat .stat-label { display: block; margin-top: 4px; font-size: .86rem; color: #c3d3e4; }

/* ---------- 问答 ---------- */
.faq { border-top: 1px solid var(--c-line-soft); }
.faq-item { padding: 18px 0; border-bottom: 1px solid var(--c-line-soft); }
.faq-item h3 { margin: 0 0 8px; font-size: 1.04rem; }
.faq-item p { margin: 0; color: var(--c-muted); }

/* ---------- CTA ---------- */
.cta-band { background: var(--c-navy); color: #e8eef6; }
.cta-band h2 { color: #fff; }
.cta-band .cta-intro { color: #c3d3e4; max-width: 620px; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 20px; }
.cta-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; align-items: start; }

/* ---------- 询盘表单 ---------- */
.lead-form { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius-lg); padding: 24px; box-shadow: var(--shadow-sm); }
.form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.w-2 { grid-column: 1 / -1; }
.field label { font-size: .9rem; font-weight: 600; color: var(--c-navy); }
.field .req { color: var(--c-accent-dark); }
.field input, .field textarea, .field select {
  width: 100%; padding: 11px 12px; font: inherit; font-size: .95rem; color: var(--c-text);
  background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius);
}
.field textarea { min-height: 118px; resize: vertical; }
.field input:focus, .field textarea:focus, .field select:focus { outline: 2px solid rgba(242, 113, 12, .3); border-color: var(--c-accent); }
.form-foot { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; margin-top: 18px; }
.form-status { margin: 0; font-size: .92rem; color: var(--c-muted); }
.form-status.is-ok { color: #1c7a45; font-weight: 600; }
.form-status.is-error { color: #b3261e; font-weight: 600; }
.form-note { margin: 14px 0 0; font-size: .84rem; color: var(--c-muted); }

/* ---------- 联系信息 ---------- */
.info-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; }
.info-list li { padding: 14px 16px; background: #fff; border: 1px solid var(--c-line); border-left: 3px solid var(--c-accent); border-radius: var(--radius); }
.info-list .info-key { display: block; font-size: .84rem; color: var(--c-muted); }
.info-list .info-val { display: block; font-size: 1rem; font-weight: 600; color: var(--c-navy); }
.info-list a { color: var(--c-navy); }

/* ---------- 侧栏布局 ---------- */
.layout-split { display: grid; grid-template-columns: 240px minmax(0, 1fr); gap: 36px; align-items: start; }
.side-nav { background: var(--c-bg-soft); border: 1px solid var(--c-line); border-radius: var(--radius-lg); overflow: hidden; }
.side-nav h2 { margin: 0; padding: 14px 18px; background: var(--c-navy); color: #fff; font-size: 1rem; }
.side-nav ul { list-style: none; margin: 0; padding: 6px 0; }
.side-nav a { display: block; padding: 10px 18px; color: var(--c-text); font-size: .93rem; border-left: 3px solid transparent; }
.side-nav a:hover { background: #fff; color: var(--c-accent-dark); }
.side-nav a.is-current { background: #fff; border-left-color: var(--c-accent); color: var(--c-navy); font-weight: 700; }
.side-block { margin-top: 22px; padding: 18px; background: var(--c-navy); color: #c3d3e4; border-radius: var(--radius-lg); font-size: .9rem; }
.side-block strong { display: block; color: #fff; margin-bottom: 6px; }
.side-block a { color: #ffd9b8; }

/* ---------- 分页 ---------- */
.pager { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-top: 28px; font-size: .92rem; }
.pager a, .pager span {
  display: inline-block; min-width: 38px; padding: 7px 12px; text-align: center;
  border: 1px solid var(--c-line); border-radius: var(--radius); background: #fff;
}
.pager .is-current { background: var(--c-navy); border-color: var(--c-navy); color: #fff; font-weight: 700; }
.pager .is-disabled { color: #a9b6c3; background: var(--c-bg-soft); }
.pager .pager-total { border: 0; background: none; color: var(--c-muted); }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-navy); color: #c3d3e4; }
.foot-main { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.3fr); gap: 30px; padding: 44px 20px 34px; }
.foot-brand img { width: 150px; height: auto; opacity: .9; }
.foot-brand p { margin: 14px 0 0; font-size: .9rem; color: #a9bccf; }
.foot-col h2 { font-size: .98rem; color: #fff; margin: 0 0 14px; }
.foot-col ul { list-style: none; margin: 0; padding: 0; }
.foot-col li { margin-bottom: 8px; font-size: .9rem; }
.foot-col a { color: #c3d3e4; }
.foot-col a:hover { color: #ffd9b8; }
.foot-contact p { margin: 0 0 10px; font-size: .9rem; }
.foot-contact .foot-tel { color: #fff; font-weight: 700; font-size: 1.05rem; }
.foot-contact a { color: #ffd9b8; }
.foot-bottom { border-top: 1px solid rgba(255, 255, 255, .14); padding: 16px 0 22px; font-size: .84rem; color: #93a7bd; }
.foot-bottom-inner { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; }
.foot-copy { margin: 0; }
.foot-bottom a { color: #a9bccf; }
.foot-bottom a:hover { color: #ffd9b8; }
.foot-bottom .foot-links { display: flex; flex-wrap: wrap; gap: 6px 20px; }
.foot-bottom .foot-links a { border-bottom: 1px dotted rgba(169, 188, 207, .5); }

/* ---------- 可滚动容器：统一细滚动条 ---------- */
.scroll-thin { scrollbar-width: thin; scrollbar-color: rgba(93, 109, 126, .35) transparent; }
.scroll-thin::-webkit-scrollbar { width: 8px; height: 8px; }
.scroll-thin::-webkit-scrollbar-thumb { background: rgba(93, 109, 126, .35); border-radius: 999px; }
.scroll-thin::-webkit-scrollbar-track { background: transparent; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .grid-4, .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .layout-split { grid-template-columns: minmax(0, 1fr); }
  .cta-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .stat-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .foot-main { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 760px) {
  body { font-size: 15px; }
  h1 { font-size: 1.55rem; }
  h2 { font-size: 1.28rem; }
  .band { padding: 38px 0; }

  .topbar { padding: 10px 0; }
  .topbar-inner { flex-direction: column; align-items: flex-start; gap: 8px; }
  .topbar-aside { align-items: flex-start; }
  .topbar-links { display: none; }
  .topbar-hotline { font-size: .88rem; }
  .topbar-hotline b { font-size: 1rem; }
  .brand img { width: 196px; }

  /* 窄屏：主导航收进「菜单」按钮，展开为面板（顶部固定时不占屏） */
  .nav-bar .wrap { position: relative; }
  .nav-menu-btn { display: flex; }
  .nav-list {
    display: none; position: absolute; top: 100%; left: -20px; right: -20px; z-index: 70;
    flex-direction: column; flex-wrap: nowrap; max-height: 68vh; overflow-y: auto;
    background: var(--c-navy); box-shadow: 0 16px 32px rgba(12, 35, 64, .3);
  }
  .nav-bar.nav-panel-open .nav-list { display: flex; }
  .nav-item { border-bottom: 1px solid rgba(255, 255, 255, .12); }
  .nav-item.has-sub > a { display: none; }
  .nav-toggle { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
  .nav-toggle::after { content: "+"; font-size: 1.1rem; color: var(--c-accent); }
  .nav-item.nav-open > .nav-toggle::after { content: "–"; }
  .sub-nav { position: static; display: none; border: 0; box-shadow: none; background: var(--c-navy-2); padding: 4px 0; }
  .nav-item.has-sub:hover > .sub-nav { display: none; }
  .nav-item.nav-open > .sub-nav { display: block; }
  .nav-open > .sub-nav a { color: #dce6f1; }
  .nav-open > .sub-nav a:hover { background: var(--c-navy-3); color: #fff; }

  .media-row { flex-direction: column; }
  .media-row .media { flex: 0 0 auto; width: 100%; }
  .gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
  .form-grid { grid-template-columns: minmax(0, 1fr); }
  .foot-main { grid-template-columns: minmax(0, 1fr); padding: 32px 20px 26px; }
  .foot-bottom-inner { flex-direction: column; align-items: flex-start; }
  .foot-bottom .foot-links { flex-direction: column; gap: 6px; }
  .entry-item { flex-direction: column; gap: 4px; }
  .entry-item .entry-date { flex: 0 0 auto; }
}