/* ============================================================
   郑州建信耐材 · 危废焚烧窑炉耐材配置解决方案页
   样式体系对齐 zzjxnh.cn/glass_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, ol { 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; }
.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; }

/* ============ 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; }

/* ============ Hero ============ */
.topic-hero { position: relative; color: #fff; overflow: hidden; }
.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); }
.topic-hero 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-flex; align-items: center; gap: 8px; padding: 12px 28px; border-radius: var(--radius); font-weight: 700; font-size: 15px; transition: .2s; }
.btn-hero-consult { background: var(--orange); color: #fff; }
.btn-hero-consult:hover { background: var(--orange-2); }
.btn-ghost { border: 1px solid rgba(255,255,255,.6); color: #fff; }
.btn-ghost:hover { border-color: #fff; background: rgba(255,255,255,.1); }
.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); }

/* ============ 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); }

/* ============ 区块通用 ============ */
.topic-section { padding: 72px 0; }
.section-head { text-align: center; max-width: 900px; margin: 0 auto 48px; }
.section-kicker { display: inline-block; color: var(--orange); font-size: 13px; letter-spacing: 4px; font-weight: 700; margin-bottom: 10px; }
.section-head h2 { font-size: 30px; color: var(--brand); margin-bottom: 14px; }
.section-desc { color: var(--text-light); font-size: 15px; }

/* ============ 应用范围卡片 ============ */
.pain-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.pain-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 24px; box-shadow: var(--shadow-sm); transition: .2s; }
.pain-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.pain-icon { width: 44px; height: 44px; border-radius: 50%; background: var(--brand); color: #fff; display: flex; align-items: center; justify-content: center; font-weight: 700; margin-bottom: 16px; font-size: 15px; }
.pain-card h3 { font-size: 18px; color: var(--brand); margin-bottom: 6px; }
.pain-part { font-size: 13px; color: var(--orange); font-weight: 600; margin-bottom: 10px; }
.pain-card p:last-child { font-size: 14px; color: var(--text-light); }

/* 工艺流程条 */
.flow-strip { display: flex; align-items: center; justify-content: center; gap: 14px; flex-wrap: wrap; margin-top: 44px; background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 24px; }
.flow-node { background: var(--brand); color: #fff; border-radius: var(--radius); padding: 10px 24px; font-weight: 700; font-size: 15px; }
.flow-node.alt { background: var(--brand-light); }
.flow-arrow { color: var(--orange); font-size: 22px; font-weight: 700; }
.flow-note { width: 100%; text-align: center; font-size: 13px; color: var(--text-light); margin-top: 6px; }

/* ============ 分部位配置 ============ */
.system-section { background: var(--bg); }
.system-list { display: flex; flex-direction: column; gap: 36px; }
.system-item { display: grid; grid-template-columns: 5fr 7fr; background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); border: 1px solid var(--border); }
.system-visual { position: relative; background: linear-gradient(135deg, var(--brand-dark), var(--brand-light)); color: #fff; padding: 34px 30px; display: flex; flex-direction: column; justify-content: flex-end; min-height: 240px; }
.sv-index { position: absolute; top: 18px; right: 24px; font-size: 52px; font-weight: 800; color: rgba(255,255,255,.18); line-height: 1; }
.sv-label { font-size: 12px; letter-spacing: 3px; color: rgba(255,255,255,.7); margin-bottom: 6px; }
.sv-title { font-size: 21px; font-weight: 700; margin-bottom: 10px; }
.sv-desc { font-size: 14px; color: rgba(255,255,255,.85); margin-bottom: 16px; }
.sv-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.sv-chips li { background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.3); border-radius: 999px; padding: 3px 12px; font-size: 12.5px; }
.system-info { padding: 30px 34px; }
.system-info h3 { font-size: 19px; color: var(--brand); margin-bottom: 8px; }
.system-temp { font-size: 13.5px; color: var(--orange); font-weight: 600; margin-bottom: 14px; }
.sys-detail p { font-size: 14.5px; margin-bottom: 10px; }
.sys-detail ul { margin: 0 0 12px; padding-left: 4px; }
.sys-detail ul li { font-size: 14.5px; color: var(--text); padding-left: 18px; position: relative; margin-bottom: 7px; }
.sys-detail ul li::before { content: ""; position: absolute; left: 2px; top: 10px; width: 7px; height: 7px; border-radius: 50%; background: var(--orange); }
.sys-detail strong { color: var(--brand); }
.sys-note { font-size: 13px; color: var(--text-light); background: var(--bg); border-left: 3px solid var(--orange); padding: 10px 14px; border-radius: 0 var(--radius) var(--radius) 0; margin-top: 6px; }

/* ============ 理化指标表 ============ */
.prop-table-wrap { overflow-x: auto; margin-top: 18px; border: 1px solid var(--border); border-radius: var(--radius); }
.prop-table { width: 100%; border-collapse: collapse; min-width: 640px; font-size: 13.5px; }
.prop-table caption { text-align: left; padding: 12px 16px; font-weight: 700; color: var(--brand); background: var(--bg); border-bottom: 1px solid var(--border); }
.prop-table th, .prop-table td { padding: 10px 14px; border-bottom: 1px solid var(--border); text-align: center; white-space: nowrap; }
.prop-table thead th { background: var(--brand); color: #fff; font-weight: 600; }
.prop-table tbody th { text-align: left; font-weight: 600; color: var(--text); background: #fbfcfe; }
.prop-table tbody tr:last-child th, .prop-table tbody tr:last-child td { border-bottom: none; }
.table-note { font-size: 12.5px; color: var(--text-light); margin-top: 10px; }

/* ============ 材料库卡片 ============ */
.mat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 26px; }
.mat-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow-sm); }
.mat-card h3 { font-size: 19px; color: var(--brand); }
.mat-tag { display: inline-block; background: rgba(255,106,0,.1); color: var(--orange); font-size: 12.5px; font-weight: 700; border-radius: 4px; padding: 2px 10px; margin: 6px 0 12px; }
.mat-card > p { font-size: 14px; color: var(--text-light); margin-bottom: 16px; }

/* ============ 选材原则 / 对比 ============ */
.principle-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-bottom: 48px; }
.principle-card { background: var(--bg); border-radius: var(--radius); padding: 26px 22px; border-top: 4px solid var(--orange); }
.principle-card h3 { font-size: 17px; color: var(--brand); margin-bottom: 10px; }
.principle-card p { font-size: 14px; color: var(--text-light); }
.vs-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.vs-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.vs-head { background: var(--brand); color: #fff; padding: 14px 22px; font-size: 17px; font-weight: 700; text-align: center; }
.vs-body { padding: 22px; }
.vs-body h4 { font-size: 15px; margin: 10px 0 8px; color: var(--brand); }
.vs-body ul li { font-size: 14px; color: var(--text); padding-left: 20px; position: relative; margin-bottom: 8px; }
.vs-body ul li::before { position: absolute; left: 0; font-weight: 700; }
.vs-good li::before { content: "＋"; color: #2e9e5b; }
.vs-bad li::before { content: "－"; color: #d04a2f; }

/* ============ 施工与验收 ============ */
.install-section { background: var(--bg); }
.install-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.install-card { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow-sm); }
.install-card h3 { font-size: 17px; color: var(--brand); margin-bottom: 12px; padding-bottom: 10px; border-bottom: 2px solid var(--orange); display: inline-block; }
.install-card ul li { font-size: 14px; color: var(--text-light); padding-left: 16px; position: relative; margin-bottom: 8px; }
.install-card ul li::before { content: ""; position: absolute; left: 0; top: 9px; width: 6px; height: 6px; border-radius: 50%; background: var(--brand); }
.install-card strong { color: var(--text); }
.qc-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 22px; }
.qc-step { background: var(--brand); color: #fff; border-radius: var(--radius); padding: 20px; font-size: 14px; }
.qc-step b { display: block; font-size: 22px; color: var(--orange-2); margin-bottom: 6px; }

/* ============ 业绩 ============ */
.case-table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm); }
.case-table { width: 100%; border-collapse: collapse; min-width: 760px; font-size: 13.5px; }
.case-table caption { text-align: left; padding: 12px 16px; font-weight: 700; color: var(--brand); background: var(--bg); border-bottom: 1px solid var(--border); }
.case-table th, .case-table td { padding: 10px 14px; border-bottom: 1px solid var(--border); }
.case-table thead th { background: var(--brand); color: #fff; font-weight: 600; text-align: center; white-space: nowrap; }
.case-table tbody tr:nth-child(even) { background: #fbfcfe; }
.case-table tbody tr:last-child td { border-bottom: none; }
.case-table td.name { color: var(--text); }
.case-table td.mark { text-align: center; white-space: nowrap; color: var(--orange); font-weight: 600; }
.case-table tbody tr:hover { background: #f0f4fc; }
.case-tags { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.case-tags li { background: #fff; border: 1px solid var(--border); border-radius: 999px; padding: 6px 16px; font-size: 13.5px; color: var(--text); }
.case-tags li:hover { border-color: var(--brand); color: var(--brand); }

/* ============ FAQ ============ */
.faq-section { background: var(--bg); }
.faq-list { max-width: 960px; margin: 0 auto; display: flex; flex-direction: column; gap: 14px; }
.faq-item { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.faq-item summary { cursor: pointer; padding: 18px 22px; font-weight: 700; font-size: 15.5px; color: var(--brand); list-style: none; position: relative; padding-right: 44px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; position: absolute; right: 20px; top: 50%; transform: translateY(-50%); font-size: 22px; color: var(--orange); }
.faq-item[open] summary::after { content: "−"; }
.faq-item .faq-a { padding: 0 22px 18px; font-size: 14.5px; color: var(--text-light); }

/* ============ 咨询 CTA ============ */
.consult-section { padding-bottom: 90px; }
.consult-card { display: grid; grid-template-columns: 7fr 5fr; background: linear-gradient(120deg, var(--brand-dark), var(--brand)); border-radius: 12px; overflow: hidden; color: #fff; box-shadow: var(--shadow-md); }
.consult-text { padding: 44px 46px; }
.consult-tag { display: inline-block; background: var(--orange); color: #fff; font-size: 13px; font-weight: 700; border-radius: 4px; padding: 3px 12px; margin-bottom: 14px; }
.consult-text h2 { font-size: 26px; margin-bottom: 12px; }
.consult-text > p { font-size: 14.5px; color: rgba(255,255,255,.85); margin-bottom: 18px; }
.consult-features li { display: flex; gap: 10px; font-size: 14px; margin-bottom: 9px; color: rgba(255,255,255,.92); }
.check-icon { color: var(--orange-2); font-weight: 800; }
.consult-action-box { background: rgba(255,255,255,.08); border-left: 1px solid rgba(255,255,255,.15); padding: 36px 34px; }
.action-header { font-size: 17px; font-weight: 700; margin-bottom: 18px; }
.consult-contact li { display: flex; justify-content: space-between; gap: 14px; padding: 10px 0; border-bottom: 1px dashed rgba(255,255,255,.2); font-size: 14px; }
.consult-contact .label { color: rgba(255,255,255,.65); white-space: nowrap; }
.consult-contact .phone { font-size: 20px; font-weight: 800; color: var(--orange-2); }
.consult-btn-wrap { margin-top: 22px; }
.btn-consult { display: block; text-align: center; background: var(--orange); color: #fff; padding: 13px 0; border-radius: var(--radius); font-weight: 700; font-size: 15px; }
.btn-consult:hover { background: var(--orange-2); }

/* ============ 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; }

/* ============ 响应式（对齐参考页断点） ============ */
@media (max-width: 1240px) {
  .topic-hero h1 { font-size: 40px; }
}
@media (max-width: 1080px) {
  .main-nav ul { gap: 20px; }
  .main-nav { gap: 20px; }
  .pain-grid, .principle-grid { grid-template-columns: repeat(2, 1fr); }
  .qc-steps { grid-template-columns: repeat(2, 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; }
  .topic-hero 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, .consult-card, .vs-grid { grid-template-columns: 1fr; }
  .mat-grid, .install-grid { grid-template-columns: 1fr; }
  .consult-action-box { border-left: none; border-top: 1px solid rgba(255,255,255,.15); }
  .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, .principle-grid, .qc-steps { grid-template-columns: 1fr; }
  .hero-points li { font-size: 12.5px; padding: 6px 14px; }
  .btn { padding: 12px 26px; font-size: 15px; }
  .mat-card { padding: 22px 18px; }
  .consult-text h2 { font-size: 24px; }
  .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; }

  /* 窄屏表格：压缩留白并提示可横向滑动 */
  .prop-table { min-width: 380px; font-size: 12px; }
  .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;
  }
  .case-table { min-width: 560px; font-size: 12px; }
  .case-table th, .case-table td { padding: 8px 8px; }
  .case-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;
  }
}
@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; }
}