/* ============================================================
   郑州建信耐材 · 玻璃窑耐材配置解决方案页
   样式体系对齐 zzjxnh.cn/cement_solution.html
   ============================================================ */

:root {
  --brand: #183883;
  --brand-dark: #0f2a66;
  --brand-light: #2c56b5;
  --text: #333333;
  --text-light: #666666;
  --bg: #f8f9fb;
  --border: #e5e5e5;
  --orange: #ff6a00;
  --orange-2: #ff7a1a;
  --radius: 8px;
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, .05);
  --shadow-md: 0 12px 30px rgba(24, 56, 131, .12);
  --maxw: 1400px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "黑体", tahoma, arial, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* 防止表格最小宽度撑破栅格列 */
.pain-card, .system-item > *, .mat-card, .case-item, .service-card,
.consult-text, .consult-action-box { min-width: 0; }

/* ============ 顶部信息条 ============ */
.topbar {
  background: var(--brand-dark);
  color: rgba(255, 255, 255, .85);
  font-size: 13px;
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 40px;
  flex-wrap: wrap;
}
.topbar-tip { font-size: 13px; letter-spacing: .2px; }
.topbar-contact { display: flex; align-items: center; gap: 24px; }
.tb-item { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; }
.tb-item:hover { color: #fff; }
.ico-phone {
  width: 12px; height: 12px; border: 1.6px solid currentColor;
  border-radius: 50% 50% 50% 0; transform: rotate(-45deg);
  display: inline-block; opacity: .9;
}
.tb-inquiry {
  padding: 4px 14px; border: 1px solid rgba(255, 255, 255, .35);
  border-radius: 100px; transition: all .3s;
}
.tb-inquiry:hover { background: var(--orange); border-color: var(--orange); color: #fff; }

/* ============ 头部导航 ============ */
.site-header {
  position: sticky; top: 0; z-index: 900;
  background: #fff;
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s, padding .3s;
}
.site-header.is-stuck { box-shadow: 0 6px 20px rgba(15, 42, 102, .10); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px; min-height: 82px;
}
.logo { display: flex; align-items: center; flex: none; }
.logo img { height: 50px; width: auto; display: block; }

.main-nav { display: flex; align-items: center; gap: 26px; flex: none; }
.main-nav ul { display: flex; align-items: center; gap: 24px; }
.main-nav ul a {
  position: relative; font-size: 15.5px; color: var(--text);
  padding: 28px 0; display: inline-block; transition: color .25s; white-space: nowrap;
}
.main-nav ul a::after {
  content: ""; position: absolute; left: 50%; bottom: 20px;
  width: 0; height: 2px; background: var(--brand);
  transform: translateX(-50%); transition: width .28s;
}
.main-nav ul a:hover { color: var(--brand); }
.main-nav ul a:hover::after { width: 100%; }
.main-nav li.active > a { color: var(--brand); font-weight: 700; }
.main-nav li.active > a::after { width: 100%; background: var(--orange); }

.nav-cta {
  flex: none; display: inline-block;
  padding: 11px 26px; border-radius: 100px;
  background: linear-gradient(135deg, var(--orange-2), var(--orange));
  color: #fff; font-size: 15px; font-weight: 700;
  box-shadow: 0 4px 14px rgba(255, 106, 0, .35);
  transition: all .3s; white-space: nowrap;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(255, 106, 0, .5); }

.nav-toggle {
  display: none; width: 44px; height: 44px; padding: 0;
  border: 1px solid var(--border); border-radius: 6px; background: #fff;
  cursor: pointer; flex-direction: column; justify-content: center; align-items: center; gap: 5px;
}
.nav-toggle span { width: 20px; height: 2px; background: var(--brand); display: block; }

/* ============ 首屏 ============ */
.topic-hero {
  position: relative; min-height: 640px; display: flex; align-items: center;
  overflow: hidden; background: var(--brand-dark);
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; object-position: center 45%; }
.hero-mask {
  position: absolute; inset: 0; z-index: 1;
  background:
    linear-gradient(90deg, rgba(15, 42, 102, .95) 0%, rgba(24, 56, 131, .82) 38%, rgba(24, 56, 131, .34) 66%, rgba(24, 56, 131, .10) 100%);
}
.hero-content { position: relative; z-index: 2; color: #fff; padding: 90px 20px; width: 100%; }

.breadcrumb { font-size: 14px; margin-bottom: 22px; color: rgba(255, 255, 255, .8); }
.breadcrumb a { color: rgba(255, 255, 255, .8); }
.breadcrumb a:hover { color: #fff; text-decoration: underline; }
.breadcrumb em { font-style: normal; color: #fff; }
.breadcrumb span { margin: 0 8px; color: rgba(255, 255, 255, .45); }

.hero-content h1 {
  font-size: 46px; line-height: 1.25; margin: 0 0 18px;
  letter-spacing: .5px; font-weight: 800;
  text-shadow: 0 2px 18px rgba(0, 0, 0, .18);
}
.hero-sub {
  font-size: 18px; line-height: 1.9; max-width: 760px;
  color: rgba(255, 255, 255, .92); margin-bottom: 26px;
}
.hero-points { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 34px; }
.hero-points li {
  padding: 8px 20px; border: 1px solid rgba(255, 255, 255, .45);
  border-radius: 100px; font-size: 14px; background: rgba(255, 255, 255, .10);
  backdrop-filter: blur(2px);
}
.hero-cta { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 46px; }

.btn { display: inline-block; padding: 14px 36px; border-radius: 4px; font-size: 16px; transition: all .3s; }
.btn-hero-consult {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: linear-gradient(135deg, var(--orange-2) 0%, var(--orange) 100%);
  color: #fff; font-weight: 700; border-radius: 50px;
  box-shadow: 0 4px 15px rgba(255, 106, 0, .4);
}
.btn-hero-consult:hover {
  background: linear-gradient(135deg, #ff8c3a 0%, #e65c00 100%);
  transform: translateY(-3px); box-shadow: 0 8px 25px rgba(255, 106, 0, .6); color: #fff;
}
.btn-hero-consult .arrow { transition: transform .3s; }
.btn-hero-consult:hover .arrow { transform: translateX(5px); }
.btn-ghost {
  color: #fff; border: 1px solid rgba(255, 255, 255, .6);
  border-radius: 50px; padding: 14px 34px;
}
.btn-ghost:hover { background: rgba(255, 255, 255, .16); color: #fff; }

.hero-stats {
  display: flex; flex-wrap: wrap; gap: 0;
  border-top: 1px solid rgba(255, 255, 255, .18);
  padding-top: 26px; max-width: 760px;
}
.hero-stats div {
  flex: 1 1 150px; padding-right: 24px;
  border-right: 1px solid rgba(255, 255, 255, .14); margin-right: 24px;
}
.hero-stats div:last-child { border-right: none; margin-right: 0; }
.hero-stats b { display: block; font-size: 30px; line-height: 1.2; letter-spacing: .5px; }
.hero-stats span { font-size: 13px; color: rgba(255, 255, 255, .72); }

/* ============ 通用区块 ============ */
.topic-section { padding: 84px 0; }
.section-head { text-align: center; max-width: 880px; margin: 0 auto 52px; }
.section-kicker {
  display: inline-block; font-size: 12px; letter-spacing: 2.4px;
  color: var(--brand); font-weight: 700; margin-bottom: 14px; opacity: .75;
}
.section-head h2 {
  font-size: 34px; color: var(--brand); line-height: 1.35; margin-bottom: 16px; font-weight: 700;
}
.section-head h2::after {
  content: ""; display: block; width: 46px; height: 3px;
  background: var(--orange); margin: 18px auto 0;
}
.section-desc { font-size: 15.5px; color: var(--text-light); line-height: 1.9; }

/* ============ 应用范围 ============ */
.pain-section { background: var(--bg); }
.pain-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.pain-card {
  position: relative; background: #fff; border-radius: var(--radius);
  padding: 34px 26px 30px; border-top: 3px solid var(--brand);
  transition: box-shadow .3s, transform .3s;
}
.pain-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.pain-icon {
  font-size: 34px; font-weight: 800; color: var(--brand); opacity: .18;
  line-height: 1; margin-bottom: 12px; letter-spacing: -1px;
}
.pain-card h3 { font-size: 20px; color: var(--brand); margin-bottom: 8px; }
.pain-part {
  font-size: 13px; color: var(--brand); background: rgba(24, 56, 131, .07);
  border-radius: 4px; padding: 5px 10px; display: inline-block; margin-bottom: 14px;
}
.pain-card p:last-child { font-size: 14px; color: var(--text-light); line-height: 1.85; }

/* ============ 分部位配置 ============ */
.system-section { background: #fff; }
.system-list { display: flex; flex-direction: column; gap: 64px; }
.system-item {
  display: grid; grid-template-columns: 0.85fr 1.15fr; gap: 52px; align-items: start;
}
.system-item.reverse .system-visual { order: 2; }
.system-item.reverse .system-info { order: 1; }

/* 左侧部位视觉卡 */
.system-visual {
  position: relative; border-radius: 14px; overflow: hidden;
  background: linear-gradient(150deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff; padding: 38px 34px 34px;
  box-shadow: 0 18px 40px rgba(15, 42, 102, .18);
  display: flex; flex-direction: column;
  align-self: start; position: sticky; top: 104px;
}
.system-visual.alt { background: linear-gradient(150deg, #1d4aa3 0%, #12306f 100%); }
/* 砖块纹样底纹 */
.sv-bg {
  position: absolute; inset: 0; opacity: .14; pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(255,255,255,.9) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(90deg, rgba(255,255,255,.9) 0 1px, transparent 1px 96px);
  background-position: 0 0, 24px 0;
  mask-image: radial-gradient(120% 100% at 100% 0%, #000 10%, transparent 72%);
  -webkit-mask-image: radial-gradient(120% 100% at 100% 0%, #000 10%, transparent 72%);
}
.sv-index {
  position: relative; font-size: 58px; font-weight: 800; line-height: 1;
  color: rgba(255, 255, 255, .22); letter-spacing: -2px;
}
.sv-body { position: relative; z-index: 1; margin-top: 22px; }
.sv-label {
  font-size: 12px; letter-spacing: 2px; color: rgba(255, 255, 255, .6);
  text-transform: uppercase; margin-bottom: 10px;
}
.sv-title { font-size: 22px; line-height: 1.5; margin-bottom: 14px; font-weight: 700; }
.sv-desc { font-size: 14px; line-height: 1.9; color: rgba(255, 255, 255, .82); margin-bottom: 22px; }
.sv-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.sv-chips li {
  font-size: 12.5px; padding: 6px 12px; border-radius: 100px;
  background: rgba(255, 255, 255, .12); border: 1px solid rgba(255, 255, 255, .22);
  color: #fff;
}

/* 右侧文字 */
.system-info h3 {
  font-size: 25px; color: var(--brand); margin-bottom: 12px; font-weight: 700;
  line-height: 1.4;
}
.system-temp {
  display: inline-block; font-size: 13px; color: var(--brand);
  background: rgba(24, 56, 131, .08); padding: 6px 14px;
  border-radius: 100px; margin-bottom: 20px;
}
.sys-detail p { font-size: 15px; color: var(--text-light); line-height: 1.95; margin-bottom: 12px; }
.sys-detail ul { padding-left: 0; margin-bottom: 14px; }
.sys-detail li {
  position: relative; font-size: 14.5px; color: var(--text-light);
  line-height: 1.95; padding-left: 16px; margin-bottom: 9px;
}
.sys-detail li::before {
  content: ""; position: absolute; left: 0; top: 11px;
  width: 6px; height: 6px; border-radius: 50%; background: var(--orange); opacity: .8;
}
.sys-detail strong { color: var(--brand); }

/* 理化指标表 */
.prop-table-wrap {
  margin-top: 6px; background: var(--bg); border-radius: 6px;
  padding: 10px; overflow-x: auto;
}
.prop-table {
  width: 100%; border-collapse: collapse; font-size: 13px; text-align: center;
  min-width: 460px;
}
.prop-table th {
  background: var(--brand); color: #fff; padding: 10px 8px;
  font-weight: 400; border: 1px solid var(--brand-dark); white-space: nowrap;
}
.prop-table td {
  padding: 8px; border: 1px solid var(--border); color: #555;
  background: #fff;
}
.prop-table td:first-child { text-align: left; color: var(--text); background: #fbfcfe; }
.prop-table tbody th {
  padding: 8px; border: 1px solid var(--border);
  background: #fbfcfe; color: var(--text);
  text-align: left; font-weight: 400;
}
.prop-table tr:nth-child(even) th { background: #f6f8fc; }
.prop-table tbody tr:hover th { background: #eef3fc; }
.prop-table tr:nth-child(even) td { background: #fcfcfd; }
.prop-table tr:nth-child(even) td:first-child { background: #f6f8fc; }
.prop-table tbody tr:hover td { background: #eef3fc; }

.spec-note {
  margin-top: 44px; text-align: center; font-size: 13px; color: #8a8f99;
  padding: 14px; border-top: 1px dashed var(--border);
}

/* ============ 材料指标库 ============ */
.material-section { background: var(--bg); }
.filter-bar {
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-bottom: 40px;
}
.filter-btn {
  padding: 10px 24px; border-radius: 100px; border: 1px solid var(--border);
  background: #fff; color: var(--text-light); font-size: 14.5px; cursor: pointer;
  font-family: inherit; transition: all .25s;
}
.filter-btn:hover { border-color: var(--brand); color: var(--brand); }
.filter-btn.active {
  background: var(--brand); border-color: var(--brand); color: #fff;
  box-shadow: 0 6px 16px rgba(24, 56, 131, .25);
}
.mat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.mat-card {
  background: #fff; border-radius: 10px; padding: 28px 26px 24px;
  box-shadow: var(--shadow-sm); transition: all .3s;
  border: 1px solid transparent;
}
.mat-card:hover { box-shadow: var(--shadow-md); border-color: rgba(24, 56, 131, .12); transform: translateY(-3px); }
.mat-card.is-hidden { display: none; }
.mat-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 14px; margin-bottom: 12px; flex-wrap: wrap;
}
.mat-head h3 { font-size: 19px; color: var(--brand); font-weight: 700; }
.mat-tag {
  font-size: 12px; color: var(--brand); background: rgba(24, 56, 131, .08);
  padding: 4px 12px; border-radius: 100px; white-space: nowrap;
}
.mat-desc { font-size: 13.5px; color: var(--text-light); line-height: 1.85; margin-bottom: 16px; }
.mat-card .prop-table { min-width: 420px; font-size: 12.5px; }
.mat-card .prop-table th { padding: 9px 6px; }
.mat-card .prop-table td { padding: 7px 6px; }

/* ============ 生产与验收 ============ */
.gallery-section { background: #fff; }
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.case-item {
  margin: 0; background: #fff; border-radius: 10px; overflow: hidden;
  box-shadow: var(--shadow-sm); transition: all .3s;
}
.case-item:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); }
.case-item img {
  width: 100%; height: 260px; object-fit: cover; transition: transform .5s;
}
.case-item:hover img { transform: scale(1.05); }
.case-item figcaption {
  padding: 16px 18px; font-size: 14px; color: var(--text);
  text-align: center; border-top: 1px solid #f0f0f0; line-height: 1.7;
}

/* 图墙中的考察引导卡 */
.case-cta {
  display: block; min-height: 320px;
  background: linear-gradient(150deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff; position: relative; overflow: hidden;
}
.case-cta::after {
  content: ""; position: absolute; right: -60px; bottom: -60px;
  width: 200px; height: 200px; border-radius: 50%;
  background: rgba(255, 255, 255, .06);
}
.case-cta-inner { padding: 34px 30px; display: flex; flex-direction: column; height: 100%; }
.case-cta-tip { font-size: 11.5px; letter-spacing: 2px; color: rgba(255, 255, 255, .55); margin-bottom: 14px; }
.case-cta-title { font-size: 22px; line-height: 1.5; font-weight: 700; margin-bottom: 14px; }
.case-cta-desc { font-size: 13.5px; line-height: 1.85; color: rgba(255, 255, 255, .78); margin-bottom: auto; }
.case-cta-btn {
  display: inline-block; margin-top: 22px; align-self: flex-start;
  padding: 11px 26px; border-radius: 100px;
  background: var(--orange); color: #fff; font-size: 14.5px; font-weight: 700;
  transition: all .3s;
}
.case-cta:hover .case-cta-btn { background: #e65c00; transform: translateX(4px); }

/* ============ 品质服务 ============ */
.service-section { background: var(--bg); }
.service-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.service-card {
  padding: 34px 26px; background: #fff; border-radius: var(--radius);
  border: 1px solid var(--border); transition: all .3s;
  position: relative; overflow: hidden;
}
.service-card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--brand); transform: scaleY(0); transform-origin: top;
  transition: transform .35s;
}
.service-card:hover { border-color: transparent; box-shadow: var(--shadow-md); transform: translateY(-3px); }
.service-card:hover::before { transform: scaleY(1); }
.service-card h3 {
  font-size: 18px; color: var(--brand); margin-bottom: 14px;
  padding-bottom: 14px; border-bottom: 2px solid rgba(24, 56, 131, .12);
}
.service-card p { font-size: 14px; color: var(--text-light); line-height: 1.9; }

/* ============ 咨询 ============ */
.consult-section { background: #f4f6f9; }
.consult-card {
  display: grid; grid-template-columns: 1.15fr 1fr;
  background: #fff; border-radius: 16px; overflow: hidden;
  box-shadow: 0 20px 50px rgba(24, 56, 131, .08);
  max-width: 1180px; margin: 0 auto;
}
.consult-text { padding: 58px 56px; display: flex; flex-direction: column; justify-content: center; }
.consult-tag {
  align-self: flex-start; background: rgba(24, 56, 131, .08); color: var(--brand);
  font-size: 13px; font-weight: 700; padding: 5px 14px; border-radius: 50px;
  margin-bottom: 18px;
}
.consult-text h2 { font-size: 32px; color: var(--brand); line-height: 1.35; margin-bottom: 18px; }
.consult-text > p { font-size: 15.5px; color: var(--text-light); line-height: 1.9; margin-bottom: 28px; }
.consult-features li {
  display: flex; align-items: center; font-size: 15px; color: #444; margin-bottom: 13px;
}
.check-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 20px; height: 20px; background: var(--brand); color: #fff;
  border-radius: 50%; font-size: 12px; font-style: normal; margin-right: 12px;
  flex: none;
}
.consult-action-box {
  background: linear-gradient(135deg, var(--brand) 0%, var(--brand-dark) 100%);
  color: #fff; padding: 58px 46px;
  display: flex; flex-direction: column; justify-content: center;
}
.action-header {
  font-size: 21px; font-weight: 700; margin-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, .2); padding-bottom: 16px;
}
.consult-contact li { display: flex; flex-direction: column; margin-bottom: 20px; }
.consult-contact .label { font-size: 13px; color: rgba(255, 255, 255, .68); margin-bottom: 6px; }
.consult-contact .value { font-size: 17px; font-weight: 700; color: #fff; }
.consult-contact .phone { font-size: 30px; color: var(--orange); letter-spacing: .5px; }
.btn-consult {
  display: block; width: 100%; padding: 16px 0; text-align: center;
  background: var(--orange); color: #fff; font-size: 17px; font-weight: 700;
  border-radius: 8px; box-shadow: 0 4px 15px rgba(255, 106, 0, .3);
  transition: all .3s;
}
.btn-consult:hover { background: #e65c00; transform: translateY(-2px); box-shadow: 0 6px 20px rgba(255, 106, 0, .5); }

/* ============ 页脚 ============ */
.site-footer { background: #0d2252; color: rgba(255, 255, 255, .72); }
.footer-grid {
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.1fr;
  gap: 44px; padding: 64px 20px 48px;
}
.footer-logo {
  display: inline-block; 
  transition: opacity .25s;
}
.footer-logo:hover { opacity: .85; }
.footer-logo img { height: auto; display: block; }
.footer-desc { font-size: 13.5px; line-height: 1.95; color: rgba(255, 255, 255, .62); max-width: 380px; }
.footer-col h3 {
  font-size: 15px; color: #fff; margin-bottom: 18px; font-weight: 700;
  padding-bottom: 12px; border-bottom: 1px solid rgba(255, 255, 255, .12);
}
.footer-col li { font-size: 13.5px; line-height: 2.2; }
.footer-col a:hover { color: var(--orange); }
.footer-contact li { color: rgba(255, 255, 255, .75); }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding: 20px 0; font-size: 13px; color: rgba(255, 255, 255, .45);
}
.footer-bottom .container { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.footer-note { color: rgba(255, 255, 255, .38); }
.footer-copy { margin: 0; }
.footer-beian a {
  display: inline-flex; align-items: center; gap: 6px;
  color: rgba(255, 255, 255, .72); transition: color .25s;
}
.footer-beian a:hover { color: #fff; }
.footer-beian img { display: block; width: 16px; height: 16px; }
.footer-bottom-sub {
  border-top: 1px solid rgba(255, 255, 255, .06);
  padding: 14px 0 22px; font-size: 12.5px;
}
.footer-bottom-sub .container { align-items: flex-start; }

/* ============ 无障碍与搜索引擎友好的辅助样式 ============ */
.skip-link {
  position: absolute; left: 12px; top: -70px; z-index: 2000;
  background: var(--brand); color: #fff; padding: 10px 20px;
  border-radius: 6px; font-size: 14px; transition: top .25s;
}
.skip-link:focus { top: 12px; color: #fff; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--orange); outline-offset: 3px;
}
/* 仅屏幕阅读器与抓取程序可见（不影响视觉） */
.sr-only,
.prop-table caption {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

/* ============ 本页导读 ============ */
.page-index { background: #fff; border-bottom: 1px solid var(--border); }
.page-index .container {
  display: flex; align-items: center; gap: 0 24px;
  padding: 15px 20px; flex-wrap: wrap;
}
.pi-label {
  flex: none; display: inline-flex; align-items: center; gap: 9px;
  font-size: 13px; font-weight: 700; letter-spacing: 1px; color: var(--brand);
}
.pi-label::before {
  content: ""; width: 4px; height: 15px; border-radius: 2px; background: var(--orange);
}
.page-index ol {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0;
  counter-reset: pi; list-style: none; margin: 0; padding: 0;
  flex: 1;
}
.page-index li {
  counter-increment: pi; list-style: none; position: relative;
  flex: 1 1 auto; display: flex; justify-content: center;
}
.page-index li + li::before {
  content: ""; position: absolute; left: 0; top: 50%;
  width: 1px; height: 13px; margin-top: -6px;
  background: var(--border);
}
.page-index a {
  position: relative; display: inline-flex; align-items: baseline; gap: 8px;
  margin: 0 22px; padding: 3px 0; font-size: 14.5px;
  color: var(--text-light); white-space: nowrap; transition: color .25s;
}
.page-index a::before {
  content: counter(pi, decimal-leading-zero);
  font-size: 11.5px; font-weight: 700; letter-spacing: .5px;
  color: #b3bac6; font-variant-numeric: tabular-nums;
  transition: color .25s;
}
.page-index a::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -2px;
  height: 1.5px; background: var(--brand); border-radius: 1px;
  transform: scaleX(0); transform-origin: left; transition: transform .28s ease;
}
.page-index a:hover { color: var(--brand); }
.page-index a:hover::before { color: var(--orange); }
.page-index a:hover::after { transform: scaleX(1); }

/* ============ 常见问题 ============ */
.faq-section { background: #fff; }
.faq-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.faq-item {
  padding: 26px 28px; background: var(--bg);
  border-radius: 10px; border-left: 3px solid var(--brand);
  transition: box-shadow .3s, transform .3s;
}
.faq-item:hover { box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.faq-item h3 {
  font-size: 16.5px; color: var(--brand); line-height: 1.6;
  margin-bottom: 12px; font-weight: 700;
}
.faq-item p { font-size: 14px; color: var(--text-light); line-height: 1.95; }

/* ============ 入场动画 ============ */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-in { opacity: 1; transform: none; }

/* ============ 响应式 ============ */
@media (max-width: 1240px) {
  .pain-grid, .service-grid { grid-template-columns: repeat(2, 1fr); }
  .system-item { grid-template-columns: 1fr 1.1fr; gap: 40px; }
  .hero-content h1 { font-size: 40px; }
}

@media (max-width: 1080px) {
  .main-nav ul { gap: 20px; }
  .main-nav { gap: 20px; }
  .mat-grid { grid-template-columns: 1fr; }
  .case-grid { grid-template-columns: repeat(2, 1fr); }
  .faq-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 34px; }
}

@media (max-width: 992px) {
  .nav-toggle { display: flex; }
  .main-nav {
    position: absolute; left: 0; right: 0; top: 100%;
    background: #fff; flex-direction: column; align-items: stretch;
    gap: 0; padding: 8px 20px 20px; border-bottom: 1px solid var(--border);
    box-shadow: 0 16px 30px rgba(15, 42, 102, .12);
    display: none;
  }
  .main-nav.is-open { display: flex; }
  .main-nav ul { flex-direction: column; align-items: stretch; gap: 0; }
  .main-nav ul a { padding: 14px 0; border-bottom: 1px solid #f2f2f2; font-size: 15px; }
  .main-nav ul a::after { display: none; }
  .nav-cta { margin-top: 16px; text-align: center; }
  .header-inner { position: relative; min-height: 68px; }
  .logo img { height: 42px; }

  .topic-hero { min-height: auto; }
  .hero-content { padding: 64px 20px; }
  .hero-content h1 { font-size: 32px; }
  .hero-sub { font-size: 16px; }
  .hero-stats div { flex: 1 1 45%; border-right: none; margin-right: 0; }
  .hero-stats b { font-size: 24px; }

  .system-item, .system-item.reverse { grid-template-columns: 1fr; gap: 26px; }
  .system-item.reverse .system-visual, .system-item.reverse .system-info { order: 0; }
  .system-visual { position: static; min-height: 0; padding: 32px 26px; }
  .sv-index { font-size: 44px; }

  .consult-card { grid-template-columns: 1fr; }
  .consult-text { padding: 40px 30px; }
  .consult-action-box { padding: 40px 30px; }
  .consult-text h2 { font-size: 26px; }

  .pi-label { display: none; }
  .page-index .container { gap: 0; }
  .page-index li { flex: 0 0 auto; }
  .page-index a { margin: 0 16px; font-size: 14px; }
}

@media (max-width: 768px) {
  .topbar-tip { display: none; }
  .topbar-inner { justify-content: center; min-height: 38px; }
  .topic-section { padding: 54px 0; }
  .section-head h2 { font-size: 24px; }
  .section-desc { font-size: 14px; }
  .pain-grid, .service-grid, .case-grid { grid-template-columns: 1fr; }
  .system-list { gap: 44px; }
  .system-info h3 { font-size: 21px; }
  .case-item img { height: 210px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; padding: 44px 20px 34px; }
  .footer-bottom .container { flex-direction: column; gap: 8px; }
  .footer-logo img { width: 150px; }
  .footer-copy { font-size: 12px; line-height: 1.8; }
  .page-index .container { gap: 0; padding: 10px 20px; }
  .page-index ol { gap: 4px 0; }
  .page-index a { margin: 0 10px; padding: 5px 0; font-size: 13.5px; gap: 6px; }
  .faq-item { padding: 22px 20px; }
  .faq-item h3 { font-size: 15.5px; }
  .hero-points li { font-size: 12.5px; padding: 6px 14px; }
  .btn { padding: 12px 26px; font-size: 15px; }
  .filter-btn { padding: 8px 18px; font-size: 13.5px; }
  .mat-card { padding: 22px 18px; }
  .consult-contact .phone { font-size: 25px; }

  /* 窄屏表格：压缩留白并提示可横向滑动 */
  .prop-table { min-width: 380px; font-size: 12px; }
  .mat-card .prop-table { min-width: 380px; }
  .prop-table th, .prop-table td { padding: 7px 4px; }
  .prop-table-wrap { position: relative; }
  .prop-table-wrap::after {
    content: "← 左右滑动查看完整表格 →";
    display: block; text-align: center; font-size: 11.5px;
    color: #9aa0ab; padding-top: 8px;
  }
}

/* 小屏：导读条再收紧，隐藏序号保持两行以内 */
@media (max-width: 480px) {
  .page-index a { margin: 0 8px; font-size: 13px; gap: 0; }
  .page-index a::before { display: none; }
  .page-index li + li::before { display: none; }
}