/* =========================================================
   中国国际工业装备博览会 官网 样式
   设计基调：专业、稳重、工业感；深钢蓝 + 工业橙
   响应式：桌面 / 平板 / 移动端
   ========================================================= */

:root {
  --c-navy: #0d2b4e;
  --c-navy-2: #143a63;
  --c-steel: #1f5f8b;
  --c-accent: #e8541e;       /* 工业橙，用于 CTA / 强调 */
  --c-accent-dark: #c8410f;
  --c-ink: #16263a;
  --c-text: #2a3a4f;
  --c-muted: #5f7184;
  --c-line: #e3e9f0;
  --c-bg: #f4f7fb;
  --c-white: #ffffff;
  --c-soft: #eef3f9;
  --radius: 10px;
  --shadow-sm: 0 2px 8px rgba(13, 43, 78, .06);
  --shadow-md: 0 8px 24px rgba(13, 43, 78, .10);
  --maxw: 1200px;
  --header-h: 72px;
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--c-steel); text-decoration: none; transition: color .2s; }
a:hover { color: var(--c-accent); }
h1, h2, h3, h4 { color: var(--c-ink); line-height: 1.3; margin: 0 0 .6em; font-weight: 700; }
h1 { font-size: 2.4rem; }
h2 { font-size: 1.8rem; }
h3 { font-size: 1.3rem; }
p { margin: 0 0 1em; }
ul { margin: 0 0 1em; padding-left: 1.2em; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.muted { color: var(--c-muted); }
.center { text-align: center; }
.hidden { display: none !important; }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px; font-weight: 600;
  font-size: .98rem; cursor: pointer; border: 2px solid transparent;
  transition: all .2s; text-decoration: none; line-height: 1;
}
.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,.7); }
.btn-outline:hover { background: #fff; color: var(--c-navy); }
.btn-ghost { background: var(--c-navy); color: #fff; }
.btn-ghost:hover { background: var(--c-navy-2); color:#fff; }
.btn-light { background: #fff; color: var(--c-navy); }
.btn-light:hover { background: var(--c-soft); color: var(--c-navy); }

/* ---------- 头部 / 导航 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--c-navy); color: #fff;
  box-shadow: 0 2px 14px rgba(0,0,0,.18);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); }
.brand { display: flex; align-items: center; gap: 12px; color: #fff; }
.brand .logo {
  width: 42px; height: 42px; border-radius: 8px; flex: none;
  background: linear-gradient(135deg, var(--c-accent), #ff8a4c);
  display: grid; place-items: center; font-weight: 800; color: #fff; font-size: 1.1rem;
}
.brand .txt { line-height: 1.15; }
.brand .txt b { font-size: 1.05rem; display: block; }
.brand .txt span { font-size: .72rem; letter-spacing: .12em; color: #9fb6cf; text-transform: uppercase; }

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  color: #d7e2ef; padding: 8px 14px; border-radius: 6px; font-size: .95rem;
  white-space: nowrap;
}
.nav a:hover, .nav a.active { color: #fff; background: rgba(255,255,255,.10); }
.nav-cta { margin-left: 8px; }
.nav-toggle {
  display: none; background: none; border: 0; color: #fff; cursor: pointer;
  width: 44px; height: 44px; font-size: 1.5rem;
}

/* ---------- Hero ---------- */
.hero {
  position: relative; color: #fff; overflow: hidden;
  background:
    linear-gradient(120deg, rgba(13,43,78,.92), rgba(20,58,99,.78)),
    url("../img/hero-bg.svg") center/cover no-repeat;
}
.hero-inner { padding: 90px 0 80px; }
.hero .tag {
  display: inline-block; padding: 6px 16px; border: 1px solid rgba(255,255,255,.4);
  border-radius: 999px; font-size: .82rem; letter-spacing: .08em; margin-bottom: 18px;
  background: rgba(255,255,255,.06);
}
.hero h1 { font-size: 3rem; margin-bottom: 14px; color:#fff; }
.hero .sub { font-size: 1.25rem; max-width: 640px; color: #e8f0f8; margin-bottom: 26px; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 26px; margin: 26px 0 32px; }
.hero-meta .mi { display: flex; align-items: center; gap: 10px; }
.hero-meta .mi .ic { font-size: 1.5rem; }
.hero-meta .mi b { display: block; font-size: 1.05rem; }
.hero-meta .mi span { font-size: .85rem; color: #b9cde0; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- 区段通用 ---------- */
.section { padding: 70px 0; }
.section.alt { background: var(--c-white); }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 46px; }
.section-head .eyebrow { color: var(--c-accent); font-weight: 700; letter-spacing: .1em; text-transform: uppercase; font-size: .8rem; }
.section-head h2 { margin: 8px 0 12px; }
.section-head p { color: var(--c-muted); }

/* ---------- 数据指标 ---------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.stat {
  background: var(--c-white); border-radius: var(--radius); padding: 28px 22px; text-align: center;
  box-shadow: var(--shadow-sm); border: 1px solid var(--c-line);
}
.stat b { display: block; font-size: 2.3rem; color: var(--c-navy); line-height: 1; }
.stat span { color: var(--c-muted); font-size: .92rem; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 22px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card {
  background: var(--c-white); border: 1px solid var(--c-line); border-radius: var(--radius);
  padding: 26px; box-shadow: var(--shadow-sm); transition: transform .2s, box-shadow .2s;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.card .ic { width: 50px; height: 50px; border-radius: 12px; display: grid; place-items: center;
  background: var(--c-soft); color: var(--c-steel); font-size: 1.5rem; margin-bottom: 16px; }
.card h3 { font-size: 1.15rem; }
.card p { color: var(--c-muted); font-size: .95rem; margin: 0; }

/* ---------- 展品范围 ---------- */
.scope-group { margin-bottom: 30px; }
.scope-group h3 { display: flex; align-items: center; gap: 10px; }
.scope-group h3 .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--c-accent); }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.chip { background: var(--c-soft); color: var(--c-steel); padding: 7px 14px; border-radius: 999px; font-size: .9rem; border: 1px solid var(--c-line); }

/* ---------- 展商名录 ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.filter-btn {
  border: 1px solid var(--c-line); background: #fff; color: var(--c-text);
  padding: 8px 18px; border-radius: 999px; cursor: pointer; font-size: .9rem; transition: all .2s;
}
.filter-btn:hover { border-color: var(--c-steel); color: var(--c-steel); }
.filter-btn.active { background: var(--c-navy); color: #fff; border-color: var(--c-navy); }
.exh-card { display: flex; gap: 16px; align-items: flex-start; }
.exh-logo {
  width: 64px; height: 64px; flex: none; border-radius: 10px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--c-navy), var(--c-steel)); color: #fff; font-weight: 700; font-size: 1.3rem;
}
.exh-card h3 { margin: 0 0 4px; font-size: 1.05rem; }
.exh-card .cat { color: var(--c-accent); font-size: .82rem; font-weight: 600; }
.exh-card .desc { color: var(--c-muted); font-size: .9rem; margin: 6px 0 0; }
.exh-card .booth { font-size: .8rem; color: var(--c-muted); margin-top: 6px; }

/* ---------- 新闻 ---------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.news-card { display: flex; flex-direction: column; overflow: hidden; padding: 0; }
.news-thumb { height: 170px; background: linear-gradient(135deg, var(--c-navy), var(--c-steel)); position: relative; }
.news-thumb .cat {
  position: absolute; top: 14px; left: 14px; background: var(--c-accent); color: #fff;
  font-size: .74rem; padding: 4px 12px; border-radius: 999px; font-weight: 600;
}
.news-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.news-body .date { color: var(--c-muted); font-size: .82rem; margin-bottom: 8px; }
.news-body h3 { font-size: 1.1rem; margin: 0 0 10px; line-height: 1.4; }
.news-body p { color: var(--c-muted); font-size: .92rem; margin: 0 0 14px; flex: 1; }
.news-body a.more { font-weight: 600; font-size: .9rem; }
.news-list-item { display: flex; gap: 18px; padding: 20px 0; border-bottom: 1px solid var(--c-line); }
.news-list-item .date { flex: none; width: 78px; text-align: center; }
.news-list-item .date b { display: block; font-size: 1.7rem; color: var(--c-navy); line-height: 1; }
.news-list-item .date span { font-size: .78rem; color: var(--c-muted); }
.news-list-item h3 { margin: 0 0 6px; font-size: 1.12rem; }
.news-list-item p { margin: 0; color: var(--c-muted); font-size: .92rem; }

/* ---------- 日程 ---------- */
.schedule-day { margin-bottom: 40px; }
.schedule-day > h3 { background: var(--c-navy); color: #fff; padding: 12px 20px; border-radius: 8px; display: inline-block; }
.timeline { position: relative; margin-top: 20px; padding-left: 26px; }
.timeline::before { content: ""; position: absolute; left: 8px; top: 6px; bottom: 6px; width: 2px; background: var(--c-line); }
.tl-item { position: relative; margin-bottom: 16px; }
.tl-item::before { content: ""; position: absolute; left: -22px; top: 8px; width: 12px; height: 12px; border-radius: 50%; background: var(--c-accent); border: 3px solid #fff; box-shadow: 0 0 0 2px var(--c-accent); }
.tl-item .time { font-weight: 700; color: var(--c-navy); font-size: .92rem; }
.tl-item .title { font-weight: 600; }
.tl-item .meta { color: var(--c-muted); font-size: .88rem; }

/* ---------- 表单 ---------- */
.form-wrap { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow-sm); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field.full { grid-column: 1 / -1; }
.field label { font-size: .9rem; font-weight: 600; color: var(--c-ink); }
.field label .req { color: var(--c-accent); }
.field input, .field select, .field textarea {
  padding: 11px 14px; border: 1px solid var(--c-line); border-radius: 8px; font-size: .95rem;
  font-family: inherit; color: var(--c-text); background: #fff; transition: border .2s, box-shadow .2s;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--c-steel); box-shadow: 0 0 0 3px rgba(31,95,139,.15);
}
.field .err { color: #c0392b; font-size: .82rem; }
.form-note { font-size: .85rem; color: var(--c-muted); margin-top: 6px; }
.form-success {
  background: #e9f7ef; border: 1px solid #b7e4c7; color: #1e7e44;
  padding: 16px 20px; border-radius: 8px; margin-top: 18px; font-weight: 600;
}

/* ---------- 交通 / 酒店 ---------- */
.info-row { display: flex; gap: 16px; align-items: flex-start; padding: 18px 0; border-bottom: 1px solid var(--c-line); }
.info-row .ic { width: 44px; height: 44px; flex: none; border-radius: 10px; background: var(--c-soft); display: grid; place-items: center; font-size: 1.3rem; }
.info-row h4 { margin: 0 0 4px; }
.info-row p { margin: 0; color: var(--c-muted); font-size: .92rem; }
.hotel-card .price { color: var(--c-accent); font-weight: 700; }

/* ---------- 面包屑 / 内页头 ---------- */
.page-hero {
  background: linear-gradient(120deg, var(--c-navy), var(--c-navy-2)); color: #fff; padding: 54px 0 46px;
}
.page-hero h1 { color: #fff; font-size: 2.2rem; margin: 0 0 8px; }
.page-hero p { color: #cfe0f0; margin: 0; }
.breadcrumb { font-size: .85rem; color: #9fb6cf; margin-bottom: 12px; }
.breadcrumb a { color: #9fb6cf; }
.breadcrumb a:hover { color: #fff; }

/* ---------- 详情页 ---------- */
.article { background: #fff; border: 1px solid var(--c-line); border-radius: var(--radius); padding: 40px; max-width: 860px; margin: 0 auto; box-shadow: var(--shadow-sm); }
.article .meta { color: var(--c-muted); font-size: .88rem; margin-bottom: 22px; border-bottom: 1px solid var(--c-line); padding-bottom: 16px; }
.article h2 { font-size: 1.4rem; margin-top: 1.4em; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--c-navy); color: #cfe0f0; padding: 56px 0 24px; margin-top: 0; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1.2fr; gap: 30px; }
.footer-grid h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
.footer-grid a { color: #a9c1d8; display: block; padding: 4px 0; font-size: .92rem; }
.footer-grid a:hover { color: #fff; }
.footer-grid p { font-size: .92rem; color: #a9c1d8; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); margin-top: 36px; padding-top: 20px; text-align: center; font-size: .85rem; color: #8aa3bd; }

/* ---------- 更新指南特殊块 ---------- */
.guide-block { background: #fff; border: 1px solid var(--c-line); border-left: 4px solid var(--c-accent); border-radius: 8px; padding: 20px 24px; margin-bottom: 18px; }
.guide-block h3 { margin-top: 0; }
.guide-block code { background: var(--c-soft); padding: 2px 8px; border-radius: 5px; font-size: .9em; color: var(--c-navy); }
.guide-block pre { background: #0d2b4e; color: #d7e2ef; padding: 16px; border-radius: 8px; overflow: auto; font-size: .85rem; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3, .news-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  :root { --header-h: 60px; }
  .nav {
    position: absolute; top: var(--header-h); left: 0; right: 0;
    background: var(--c-navy-2); flex-direction: column; align-items: stretch;
    padding: 10px 16px 18px; gap: 2px; display: none; box-shadow: 0 10px 20px rgba(0,0,0,.25);
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 10px; }
  .nav-cta { margin: 8px 0 0; }
  .nav-toggle { display: block; }
  .hero h1 { font-size: 2rem; }
  .hero .sub { font-size: 1.05rem; }
  .hero-inner { padding: 60px 0 56px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .grid-3, .grid-4, .news-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .section { padding: 50px 0; }
  h1 { font-size: 1.8rem; } h2 { font-size: 1.5rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .article { padding: 26px 20px; }
}
@media (max-width: 420px) {
  .stats { grid-template-columns: 1fr 1fr; gap: 12px; }
  .hero-meta { gap: 16px; }
}

/* 回到顶部 */
.to-top {
  position: fixed; right: 20px; bottom: 20px; width: 46px; height: 46px; border-radius: 50%;
  background: var(--c-accent); color: #fff; border: 0; cursor: pointer; font-size: 1.2rem;
  box-shadow: var(--shadow-md); opacity: 0; pointer-events: none; transition: opacity .3s; z-index: 90;
}
.to-top.show { opacity: 1; pointer-events: auto; }