/* ============================================================
   移动博物馆 · 智慧博物馆SAAS平台 · 主样式
   Bootstrap 5.3 + jQuery 定制主题
   设计基调：深蓝科技 × 文化鎏金（文博馆藏气质）
   ============================================================ */

:root {
  --mb-primary: #16324f;        /* 深藏蓝 —— 主色 */
  --mb-primary-dark: #0e2133;   /* 更深藏蓝 */
  --mb-primary-light: #2a4a6e;  /* 亮藏蓝 */
  --mb-gold: #c9a55c;           /* 鎏金 —— 强调色 */
  --mb-gold-light: #e6cf9a;
  --mb-bg: #f5f7fb;             /* 页面浅底 */
  --mb-line: #e6eaf0;
  --mb-text: #2b3440;
  --mb-muted: #6b7686;
  --mb-radius: 14px;
  --mb-shadow: 0 10px 30px rgba(22, 50, 79, 0.08);
  --mb-shadow-lg: 0 20px 50px rgba(22, 50, 79, 0.14);
}

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", "Helvetica Neue", Arial, sans-serif;
  color: var(--mb-text);
  background: #fff;
  font-size: 15.5px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--mb-primary-light); text-decoration: none; transition: color .2s; }
a:hover { color: var(--mb-gold); }

h1, h2, h3, h4, h5, h6 { font-weight: 700; color: var(--mb-primary-dark); line-height: 1.4; }

.section-pad { padding: 80px 0; }
.bg-soft { background: var(--mb-bg); }
.bg-primary-mb { background: var(--mb-primary); }
.text-gold { color: var(--mb-gold) !important; }

/* ---------- 顶部导航 ---------- */
.mb-navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1030;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: 0 1px 0 var(--mb-line);
  transition: all .3s ease;
}
.mb-navbar.scrolled { box-shadow: 0 6px 24px rgba(22,50,79,.10); }
.mb-navbar .navbar-brand { display: flex; align-items: center; gap: 10px; }
.mb-navbar .navbar-brand img { height: 40px; width: auto; }
.mb-brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.mb-brand-text b { color: var(--mb-primary); font-size: 19px; letter-spacing: 2px; }
.mb-brand-text small { color: var(--mb-gold); font-size: 11px; letter-spacing: 3px; font-weight: 600; }

.mb-navbar .nav-link {
  color: var(--mb-text);
  font-weight: 500;
  font-size: 15px;
  padding: 8px 16px !important;
  position: relative;
}
.mb-navbar .nav-link::after {
  content: "";
  position: absolute;
  left: 16px; right: 16px; bottom: 4px;
  height: 2px; background: var(--mb-gold);
  transform: scaleX(0); transform-origin: left;
  transition: transform .25s ease;
}
.mb-navbar .nav-link:hover::after,
.mb-navbar .nav-link.active::after { transform: scaleX(1); }
.mb-navbar .nav-link.active { color: var(--mb-primary); }

.mb-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--mb-primary); color: #fff;
  border: 0; border-radius: 40px;
  padding: 9px 26px; font-weight: 600; font-size: 14.5px;
  transition: all .25s ease;
  cursor: pointer;
}
.mb-btn:hover { background: var(--mb-gold); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 20px rgba(201,165,92,.35); }
.mb-btn-outline {
  background: transparent; color: var(--mb-primary);
  border: 1.5px solid var(--mb-primary);
}
.mb-btn-outline:hover { background: var(--mb-primary); color: #fff; }
.mb-btn-gold { background: var(--mb-gold); color: var(--mb-primary-dark); }
.mb-btn-gold:hover { background: var(--mb-primary); color: #fff; }

/* ---------- Hero 轮播 ---------- */
.mb-hero { margin-top: 64px; position: relative; overflow: hidden; }
.mb-hero .carousel-item { position: relative; }
.mb-hero .carousel-item img { width: 100%; height: 560px; object-fit: cover; }
.mb-hero .hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(100deg, rgba(14,33,51,.82) 0%, rgba(22,50,79,.55) 45%, rgba(22,50,79,.05) 100%);
  display: flex; align-items: center;
}
.mb-hero .hero-content { color: #fff; max-width: 640px; }
.mb-hero .hero-eyebrow {
  display: inline-block; color: var(--mb-gold-light);
  border: 1px solid rgba(201,165,92,.6);
  border-radius: 30px; padding: 5px 18px; font-size: 13px; letter-spacing: 2px;
  margin-bottom: 18px; background: rgba(201,165,92,.08);
}
.mb-hero h1 { color: #fff; font-size: 44px; font-weight: 800; margin-bottom: 18px; letter-spacing: 1px; }
.mb-hero p.lead { color: rgba(255,255,255,.88); font-size: 17px; margin-bottom: 30px; }

.carousel-indicators [data-bs-target] { width: 34px; height: 4px; border-radius: 2px; background: rgba(255,255,255,.5); border: 0; }
.carousel-indicators .active { background: var(--mb-gold); }

/* ---------- 首页特性卡片 ---------- */
.mb-feature-card {
  background: #fff; border-radius: var(--mb-radius);
  border: 1px solid var(--mb-line);
  box-shadow: var(--mb-shadow);
  padding: 30px 26px; height: 100%;
  transition: transform .3s ease, box-shadow .3s ease;
  position: relative; overflow: hidden;
}
.mb-feature-card::before {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 4px;
  background: linear-gradient(90deg, var(--mb-gold), var(--mb-primary-light));
  opacity: 0; transition: opacity .3s;
}
.mb-feature-card:hover { transform: translateY(-8px); box-shadow: var(--mb-shadow-lg); }
.mb-feature-card:hover::before { opacity: 1; }
.mb-feature-icon {
  width: 62px; height: 62px; border-radius: 16px;
  background: linear-gradient(135deg, var(--mb-primary), var(--mb-primary-light));
  display: flex; align-items: center; justify-content: center;
  font-size: 28px; color: var(--mb-gold-light);
  margin-bottom: 20px;
}
.mb-feature-card h3 { font-size: 20px; margin-bottom: 12px; }
.mb-feature-card p { color: var(--mb-muted); margin-bottom: 0; font-size: 14.5px; }

/* ---------- 区块标题 ---------- */
.mb-section-head { text-align: center; max-width: 780px; margin: 0 auto 48px; }
.mb-section-head .eyebrow {
  color: var(--mb-gold); font-size: 13px; letter-spacing: 4px; font-weight: 600;
  text-transform: uppercase; display: inline-block; margin-bottom: 10px;
}
.mb-section-head h2 { font-size: 34px; margin-bottom: 14px; position: relative; }
.mb-section-head h2::after {
  content: ""; display: block; width: 60px; height: 3px; border-radius: 2px;
  background: var(--mb-gold); margin: 16px auto 0;
}
.mb-section-head p { color: var(--mb-muted); font-size: 15.5px; }

/* ---------- SaaS 优势 ---------- */
.mb-saas-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 24px; }
.mb-saas-item {
  background: #fff; border: 1px solid var(--mb-line); border-radius: var(--mb-radius);
  padding: 26px 22px; box-shadow: var(--mb-shadow); height: 100%;
}
.mb-saas-item h4 { font-size: 17px; display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.mb-saas-item h4 .bi { color: var(--mb-gold); font-size: 20px; }
.mb-saas-item ul { list-style: none; padding: 0; margin: 0; }
.mb-saas-item li {
  font-size: 14px; color: var(--mb-muted); padding: 5px 0 5px 24px; position: relative;
}
.mb-saas-item li::before {
  content: "\F26B"; font-family: "bootstrap-icons"; color: var(--mb-gold); font-weight: 700;
  position: absolute; left: 0;
}

/* ---------- 数据统计 ---------- */
.mb-stats {
  background:
    linear-gradient(rgba(14,33,51,.9), rgba(22,50,79,.92)),
    url("../img/banner-home.png") center/cover fixed;
  color: #fff; padding: 70px 0;
}
.mb-stat-num { font-size: 52px; font-weight: 800; color: var(--mb-gold-light); line-height: 1; }
.mb-stat-label { color: rgba(255,255,255,.8); margin-top: 8px; font-size: 14.5px; letter-spacing: 1px; }
.mb-stats h2 { color: #fff; }
.mb-stats h2::after { background: var(--mb-gold); }

/* ---------- 智慧场馆模块 ---------- */
.mb-module-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; }
.mb-module-item {
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  background: #fff; border: 1px solid var(--mb-line); border-radius: 12px;
  padding: 22px 12px; text-align: center; cursor: pointer;
  transition: all .25s ease;
}
.mb-module-item .bi { font-size: 30px; color: var(--mb-primary-light); transition: color .25s; }
.mb-module-item span { font-size: 14px; font-weight: 600; color: var(--mb-text); }
.mb-module-item:hover { transform: translateY(-5px); border-color: var(--mb-gold); box-shadow: var(--mb-shadow); }
.mb-module-item:hover .bi { color: var(--mb-gold); }

/* ---------- 案例卡片 ---------- */
.mb-case-card {
  background: #fff; border: 1px solid var(--mb-line); border-radius: var(--mb-radius);
  overflow: hidden; box-shadow: var(--mb-shadow); height: 100%;
  transition: transform .3s ease, box-shadow .3s ease; display: flex; flex-direction: column;
}
.mb-case-card:hover { transform: translateY(-8px); box-shadow: var(--mb-shadow-lg); }
.mb-case-thumb { position: relative; overflow: hidden; aspect-ratio: 16/10; }
.mb-case-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.mb-case-card:hover .mb-case-thumb img { transform: scale(1.06); }
.mb-case-tag {
  position: absolute; top: 12px; left: 12px; z-index: 2;
  background: rgba(14,33,51,.85); color: var(--mb-gold-light);
  font-size: 12px; padding: 4px 12px; border-radius: 20px; letter-spacing: 1px;
}
.mb-case-body { padding: 20px 22px 24px; display: flex; flex-direction: column; flex: 1; }
.mb-case-body h3 { font-size: 17px; margin-bottom: 8px; }
.mb-case-body p { color: var(--mb-muted); font-size: 14px; flex: 1; }
.mb-case-link { color: var(--mb-primary); font-weight: 600; font-size: 14px; }
.mb-case-link .bi { transition: transform .25s; }
.mb-case-link:hover .bi { transform: translateX(5px); }

/* ---------- 流程步骤 ---------- */
.mb-steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 26px; position: relative; }
.mb-step { text-align: center; position: relative; }
.mb-step-num {
  width: 58px; height: 58px; margin: 0 auto 18px; border-radius: 50%;
  background: linear-gradient(135deg, var(--mb-primary), var(--mb-primary-light));
  color: var(--mb-gold-light); font-size: 22px; font-weight: 800;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 8px 20px rgba(22,50,79,.25); position: relative; z-index: 2;
}
.mb-step h4 { font-size: 16px; margin-bottom: 8px; }
.mb-step p { color: var(--mb-muted); font-size: 13.5px; margin: 0; }

/* ---------- 运营合作/关于我们 ---------- */
.mb-about-img { border-radius: var(--mb-radius); overflow: hidden; box-shadow: var(--mb-shadow-lg); }
.mb-about-img img { width: 100%; display: block; }
.mb-check-list { list-style: none; padding: 0; margin: 0; }
.mb-check-list li { padding: 8px 0 8px 32px; position: relative; color: var(--mb-text); }
.mb-check-list li::before {
  content: "\F633"; font-family: "bootstrap-icons";
  color: var(--mb-gold); font-weight: 700; position: absolute; left: 0; font-size: 18px;
}

/* ---------- 新闻/文章卡片 ---------- */
.mb-news-card {
  display: flex; gap: 18px; background: #fff; border: 1px solid var(--mb-line);
  border-radius: var(--mb-radius); padding: 20px; box-shadow: var(--mb-shadow);
  height: 100%; transition: transform .3s, box-shadow .3s; align-items: center;
}
.mb-news-card:hover { transform: translateY(-5px); box-shadow: var(--mb-shadow-lg); }
.mb-news-date {
  flex-shrink: 0; width: 66px; height: 72px; border-radius: 12px;
  background: var(--mb-primary); color: #fff; text-align: center;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.mb-news-date b { font-size: 24px; line-height: 1; color: var(--mb-gold-light); }
.mb-news-date span { font-size: 12px; margin-top: 4px; }
.mb-news-body h3 { font-size: 16px; margin-bottom: 6px; line-height: 1.45; }
.mb-news-body p { color: var(--mb-muted); font-size: 13.5px; margin: 0; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ---------- 面包屑 ---------- */
.mb-pagehead {
  margin-top: 64px;
  background: linear-gradient(120deg, var(--mb-primary-dark), var(--mb-primary-light));
  color: #fff; padding: 52px 0 46px; position: relative; overflow: hidden;
}
.mb-pagehead::after {
  content: ""; position: absolute; right: -80px; top: -80px; width: 320px; height: 320px;
  border: 34px solid rgba(201,165,92,.14); border-radius: 50%;
}
.mb-pagehead h1 { color: #fff; font-size: 34px; margin-bottom: 10px; position: relative; z-index: 2; }
.mb-breadcrumb { color: rgba(255,255,255,.75); font-size: 14px; position: relative; z-index: 2; }
.mb-breadcrumb a { color: var(--mb-gold-light); }
.mb-breadcrumb .bi { font-size: 12px; margin: 0 6px; }

/* ---------- 正文/文章详情 ---------- */
.mb-article {
  background: #fff; border: 1px solid var(--mb-line); border-radius: var(--mb-radius);
  box-shadow: var(--mb-shadow); padding: 44px 48px;
}
.mb-article h2 { font-size: 24px; margin: 34px 0 16px; padding-left: 16px; border-left: 4px solid var(--mb-gold); }
.mb-article h3 { font-size: 20px; margin: 28px 0 12px; }
.mb-article p { margin-bottom: 16px; }
.mb-article img { max-width: 100%; border-radius: 10px; margin: 12px 0; }
.mb-article blockquote {
  border-left: 4px solid var(--mb-gold); background: var(--mb-bg);
  padding: 16px 20px; border-radius: 0 10px 10px 0; color: var(--mb-muted); margin: 20px 0;
}
.mb-article ul, .mb-article ol { padding-left: 24px; margin-bottom: 16px; }
.mb-article table { width: 100%; border-collapse: collapse; margin: 18px 0; }
.mb-article table th, .mb-article table td { border: 1px solid var(--mb-line); padding: 10px 14px; font-size: 14px; }
.mb-article table th { background: var(--mb-bg); font-weight: 600; }

.mb-article-meta { display: flex; flex-wrap: wrap; gap: 18px; color: var(--mb-muted); font-size: 13.5px; padding-bottom: 18px; margin-bottom: 26px; border-bottom: 1px solid var(--mb-line); }
.mb-tag { display: inline-block; background: var(--mb-bg); border: 1px solid var(--mb-line); color: var(--mb-primary); border-radius: 20px; font-size: 12.5px; padding: 4px 14px; margin: 3px 6px 3px 0; }
.mb-tag:hover { background: var(--mb-gold); border-color: var(--mb-gold); color: #fff; }

/* ---------- FAQ ---------- */
.mb-faq .accordion-button { font-weight: 600; color: var(--mb-primary-dark); background: #fff; }
.mb-faq .accordion-button:not(.collapsed) { background: var(--mb-bg); color: var(--mb-primary); box-shadow: none; }
.mb-faq .accordion-button:focus { box-shadow: 0 0 0 3px rgba(201,165,92,.25); }
.mb-faq .accordion-item { border: 1px solid var(--mb-line); border-radius: 10px !important; margin-bottom: 12px; overflow: hidden; }

/* ---------- 页脚 ---------- */
.mb-footer { background: var(--mb-primary-dark); color: rgba(255,255,255,.72); padding: 60px 0 0; }
.mb-footer h5 { color: #fff; font-size: 16px; margin-bottom: 20px; letter-spacing: 1px; position: relative; padding-bottom: 12px; }
.mb-footer h5::after { content: ""; position: absolute; left: 0; bottom: 0; width: 34px; height: 2px; background: var(--mb-gold); }
.mb-footer ul { list-style: none; padding: 0; margin: 0; }
.mb-footer ul li { margin-bottom: 10px; }
.mb-footer ul li a { color: rgba(255,255,255,.72); font-size: 14px; transition: color .2s, padding-left .2s; }
.mb-footer ul li a:hover { color: var(--mb-gold-light); padding-left: 5px; }
.mb-footer .contact li { display: flex; gap: 10px; font-size: 14px; }
.mb-footer .contact li .bi { color: var(--mb-gold); }
.mb-footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding: 22px 0; margin-top: 46px; font-size: 13px; }
.mb-footer-bottom a { color: var(--mb-gold-light); }

/* ---------- 浮动咨询 ---------- */
.mb-float {
  position: fixed; right: 22px; bottom: 30px; z-index: 1040;
  width: 52px; height: 52px; border-radius: 50%;
  background: var(--mb-gold); color: var(--mb-primary-dark);
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; box-shadow: 0 10px 26px rgba(201,165,92,.5);
  transition: transform .25s;
}
.mb-float:hover { transform: translateY(-4px); color: var(--mb-primary-dark); }

/* ---------- 通用工具 ---------- */
.mb-divider-gold { width: 70px; height: 3px; background: var(--mb-gold); border-radius: 2px; margin: 18px auto; }
.text-justify { text-align: justify; }
.mb-muted { color: var(--mb-muted); }

/* ---------- 响应式 ---------- */
@media (max-width: 991.98px) {
  .section-pad { padding: 56px 0; }
  .mb-hero .carousel-item img { height: 420px; }
  .mb-hero h1 { font-size: 32px; }
  .mb-pagehead h1 { font-size: 28px; }
  .mb-article { padding: 28px 22px; }
  .mb-stat-num { font-size: 40px; }
}
@media (max-width: 575.98px) {
  .mb-hero .carousel-item img { height: 360px; }
  .mb-hero h1 { font-size: 26px; }
  .mb-section-head h2 { font-size: 26px; }
  .mb-module-grid { grid-template-columns: repeat(3, 1fr); }
  .mb-news-card { flex-direction: row; }
}

/* ---------- 打印辅助（保留文字可读） ---------- */
@media print {
  .mb-navbar, .mb-float, .mb-footer { display: none !important; }
  body { background: #fff; }
  .mb-pagehead { margin-top: 0; }
}

/* 隐藏但可被 AI/爬虫读取的内容（仅供 GEO 增强，不影响视觉） */
.visually-hidden { position: absolute !important; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

/* ---------- 滚动入场动画 ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .6s ease, transform .6s ease; }
.reveal.revealed { opacity: 1; transform: translateY(0); }