:root {
    --bg: #f6f8fc;
    --card: #fff;
    --text: #0f172a;
    --muted: #475569;
    --line: #dbe4f0;
    --brand: #2563eb;
    --brand-dark: #1d4ed8;
    --hero: #0f172a;
    --hero2: #1e293b;
    --soft: #eff6ff;
    --warn: #fff7ed;
    --green: #ecfdf5;
    --radius: 16px;
    --shadow: 0 8px 24px rgba(15, 23, 42, .06)
}

* {
    box-sizing: border-box
}

html {
    scroll-behavior: smooth
}

body {
    margin: 0;
    font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.8
}

a {
    color: var(--brand);
    text-decoration: none
}

a:hover {
    color: var(--brand-dark)
}

img {
    max-width: 100%;
    display: block
}

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 20px
}

.site-header {
    background: linear-gradient(135deg, var(--hero), var(--hero2));
    color: #fff;
    padding: 18px 0 30px
}

.topbar {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px
}

.brand img {
    height: 84px;
    width: auto;
    margin-top: 4px;
}

.brand-name {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: .3px
}

.brand-sub {
    font-size: 13px;
    color: #cbd5e1;
    margin-top: 2px
}

.site-nav {
    display: flex;
    gap: 16px;
    flex-wrap: wrap
}

.site-nav a {
    color: #dbe7ff;
    font-size: 15px;
    padding: 8px 10px;
    border-radius: 10px
}

.site-nav a:hover,
.site-nav a.active {
    background: rgba(255, 255, 255, .08);
    color: #fff
}

.hero {
    padding: 28px 0 6px;
    display: grid;
    grid-template-columns: 1.15fr .85fr;
    gap: 28px;
    align-items: start
}

.hero h1 {
    font-size: 40px;
    line-height: 1.25;
    margin: 0 0 14px
}

.hero p {
    margin: 0;
    color: #d6deeb;
    font-size: 18px;
    max-width: 760px
}

.hero-card {
    background: rgba(255, 255, 255, .06);
    border: 1px solid rgba(255, 255, 255, .08);
    padding: 18px;
    border-radius: 18px;
    backdrop-filter: blur(5px)
}

.hero-points {
    margin: 0;
    padding-left: 18px;
    color: #d6deeb
}

.hero-actions {
    margin-top: 22px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap
}

.btn {
    display: inline-block;
    padding: 12px 18px;
    border-radius: 12px;
    font-weight: 700
}

.btn-primary {
    background: var(--brand);
    color: #fff
}

.btn-secondary {
    background: #162238;
    color: #fff;
    border: 1px solid #34425d
}

.section {
    padding: 34px 0
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    margin: 18px 0
}

.card h2,
.content-main h2 {
    font-size: 28px;
    line-height: 1.35;
    margin: 0 0 14px
}

.section-lead {
    color: var(--muted);
    margin: 0 0 18px
}

.grid-3,
.grid-4,
.info-grid {
    display: grid;
    gap: 16px
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr))
}

.grid-4,
.info-grid {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr))
}

.mini-card,
.info-box {
    background: #f8fbff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 16px
}

.mini-card h3,
.info-box h3 {
    margin: 0 0 10px;
    font-size: 18px
}

.mini-card p,
.info-box p {
    margin: 0;
    color: var(--muted)
}

.link-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 14px
}

.link-card {
    display: block;
    background: #f8fbff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 16px;
    color: var(--text)
}

.link-card strong {
    display: block;
    line-height: 1.6;
    font-size: 17px
}

.link-card span {
    display: block;
    color: var(--muted);
    font-size: 14px;
    margin-top: 8px
}

.link-card:hover {
    border-color: #9bb8f4;
    background: #f2f7ff
}

.index-toolbar {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    align-items: center;
    flex-wrap: wrap;
    margin: 6px 0 16px
}

.search-input {
    width: min(420px, 100%);
    padding: 12px 14px;
    border: 1px solid var(--line);
    border-radius: 12px;
    background: #fff
}

.pill-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px
}

.pill {
    display: inline-flex;
    align-items: center;
    padding: 7px 12px;
    border-radius: 999px;
    background: #eef2ff;
    color: #1e3a8a;
    font-size: 14px
}

.meta {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    color: #64748b;
    font-size: 14px;
    margin: 12px 0 0
}

.meta .tag {
    background: #f1f5f9;
    border-radius: 999px;
    padding: 4px 10px
}

.site-main {
    padding: 36px 0 50px
}

.breadcrumb {
    font-size: 14px;
    color: #dbe7ff;
    margin-top: 14px
}

.breadcrumb a {
    color: #dbe7ff;
    opacity: .9
}

.page-hero {
    padding: 20px 0 8px
}

.page-hero h1 {
    font-size: 38px;
    line-height: 1.28;
    margin: 0 0 10px
}

.page-hero p {
    color: #d7e1ef;
    font-size: 18px;
    max-width: 760px;
    margin: 0
}

.page-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 24px;
    align-items: start
}

.content-main {
    background: #fff;
    border-radius: 18px;
    padding: 26px;
    box-shadow: var(--shadow)
}

.content-main p {
    margin: 14px 0;
    color: #334155
}

.content-main h2 {
    margin-top: 34px
}

.content-main h3 {
    margin-top: 26px;
    font-size: 21px
}

.content-main ul,
.content-main ol {
    padding-left: 22px
}

.content-main li {
    margin: 8px 0
}

.content-main blockquote {
    margin: 18px 0;
    padding: 14px 16px;
    background: #f8fbff;
    border-left: 4px solid var(--brand);
    border-radius: 10px
}

.answer-box,
.lede-card {
    background: var(--soft);
    border: 1px solid #bfdbfe;
    border-left: 4px solid var(--brand);
    padding: 16px 18px;
    border-radius: 12px
}

.content-section {
    margin-top: 28px
}

.sidebar .card {
    position: sticky;
    top: 20px
}

.related-list a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px dashed var(--line)
}

.related-list a:last-child {
    border-bottom: 0
}

.content-meta {
    background: #f8fafc;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 14px 16px;
    color: #475569;
    font-size: 14px
}

.notice {
    background: var(--warn);
    border: 1px solid #fed7aa;
    border-radius: 14px;
    padding: 16px 18px
}

.kpi-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 14px
}

.kpi {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 16px
}

.kpi strong {
    display: block;
    font-size: 22px;
    margin-bottom: 4px
}

.footer {
    margin-top: 40px;
    padding: 30px 0;
    background: #e8edf4;
    color: #475569;
    font-size: 14px
}

.footer-links {
    display: flex;
    gap: 12px 18px;
    flex-wrap: wrap;
    margin-bottom: 12px
}

.footer-links a {
    color: #334155
}

.footer-desc,
.footer-record {
    margin: 8px 0
}

.table-wrap {
    overflow: auto
}

.topic-block {
    margin-top: 22px
}

.topic-block h3 {
    margin-bottom: 12px
}

.contact-placeholder {
    background: #fff;
    border: 1px dashed #93c5fd;
    padding: 12px 14px;
    border-radius: 12px
}

.simple-message {
    max-width: 760px;
    margin: 70px auto;
    background: #fff;
    border-radius: 20px;
    padding: 30px;
    box-shadow: var(--shadow);
    text-align: center
}

.simple-message h1 {
    margin-top: 0
}

.question-stat {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 12px
}

.question-stat .pill {
    background: #eef6ff
}

.hidden {
    display: none !important
}

@media (max-width:980px) {

    .hero,
    .page-layout {
        grid-template-columns: 1fr
    }

    .sidebar .card {
        position: static
    }
}

@media (max-width:768px) {
    .brand-name {
        font-size: 22px
    }

    .hero h1,
    .page-hero h1 {
        font-size: 31px
    }

    .hero p,
    .page-hero p {
        font-size: 16px
    }

    .site-nav {
        width: 100%
    }

    .site-nav a {
        padding: 6px 0
    }

    .content-main {
        padding: 20px
    }
}

/* 首页：你可以这样开始了解轻钢别墅 */
.home-guide-block{
  margin: 48px 0;
  padding: 28px 28px 30px;
  background: #f5f7fb;
  border-radius: 24px;
}

.home-guide-block h2{
  margin: 0 0 22px;
  font-size: 28px;
  line-height: 1.25;
}

.path-grid{
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.path-card{
  background: #fff;
  border: 1px solid #d9e2f1;
  border-radius: 18px;
  padding: 24px 22px;
}

.path-card h3{
  margin: 0 0 14px;
  font-size: 18px;
  line-height: 1.35;
}

.path-card p{
  margin: 0 0 14px;
  color: #24364d;
  line-height: 1.9;
}

.text-link{
  color: #2f64e8;
  text-decoration: none;
  font-weight: 600;
}

.text-link:hover{
  text-decoration: underline;
}

@media (max-width: 1100px){
  .path-grid{
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px){
  .home-guide-block{
    padding: 22px 18px 24px;
    border-radius: 18px;
  }

  .home-guide-block h2{
    font-size: 24px;
  }

  .path-grid{
    grid-template-columns: 1fr;
  }
}

.wechat-box{
  margin-top: 18px;
}

.wechat-copy-row{
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 10px 0 8px;
}

.wechat-id{
  display: inline-block;
  padding: 8px 14px;
  background: #ffffff;
  border: 1px solid #d9e2f1;
  border-radius: 10px;
  font-weight: 600;
  color: #1f2f46;
}

.copy-btn{
  border: none;
  background: #2f64e8;
  color: #fff;
  padding: 9px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
}

.copy-btn:hover{
  background: #2556cf;
}

.wechat-tip{
  margin: 8px 0 0;
  color: #4b5f78;
}