/* 西安平衡机载科技有限公司 — 站点样式
   设计原则：纯静态、无 JS 依赖、语义化优先、加载极快（便于搜索引擎与 AI 爬虫抓取） */

:root {
  --navy: #0b2b45;
  --navy-2: #10395c;
  --accent: #f26a1b;
  --accent-dark: #cf5310;
  --ink: #1a2530;
  --ink-2: #4a5a6a;
  --line: #dfe6ee;
  --bg: #ffffff;
  --bg-soft: #f5f8fb;
  --radius: 10px;
  --max: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a { color: var(--navy-2); text-decoration: none; }
a:hover { color: var(--accent-dark); text-decoration: underline; }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- 顶部导航 ---------- */
.site-header {
  background: var(--navy);
  color: #fff;
  border-bottom: 3px solid var(--accent);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  min-height: 68px;
}
.brand { display: flex; align-items: baseline; gap: 10px; color: #fff; }
.brand:hover { text-decoration: none; color: #fff; }
.brand strong { font-size: 19px; letter-spacing: .5px; }
.brand span { font-size: 12px; color: #9fb6cc; letter-spacing: 1px; }

.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a {
  color: #d6e2ee;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 15px;
}
.nav a:hover { background: rgba(255,255,255,.1); color: #fff; text-decoration: none; }
.nav a[aria-current="page"] { background: var(--accent); color: #fff; }

/* ---------- Hero ---------- */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 60%, #15507f 100%);
  color: #fff;
  padding: 72px 0 64px;
}
.hero h1 { font-size: 34px; line-height: 1.4; margin: 0 0 14px; font-weight: 700; }
.hero .lead { font-size: 18px; color: #cfe0ef; margin: 0 0 26px; max-width: 760px; }
.hero .meta-line { font-size: 14px; color: #9fb6cc; margin-top: 22px; }

.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 12px 26px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
}
.btn:hover { background: var(--accent-dark); color: #fff; text-decoration: none; }
.btn.ghost {
  background: transparent;
  border: 1px solid rgba(255,255,255,.5);
  color: #fff;
}
.btn.ghost:hover { background: rgba(255,255,255,.12); }

/* ---------- 区块 ---------- */
.section { padding: 60px 0; }
.section.soft { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section h2 {
  font-size: 26px;
  margin: 0 0 8px;
  position: relative;
  padding-left: 14px;
}
.section h2::before {
  content: "";
  position: absolute;
  left: 0; top: .55em;
  width: 4px; height: 1em;
  background: var(--accent);
}
.section .sub { color: var(--ink-2); margin: 0 0 32px; padding-left: 14px; font-size: 15px; }

h3 { font-size: 19px; margin: 0 0 10px; }
p { margin: 0 0 14px; }

/* ---------- 卡片网格 ---------- */
.grid { display: grid; gap: 20px; }
.grid.c2 { grid-template-columns: repeat(2, 1fr); }
.grid.c3 { grid-template-columns: repeat(3, 1fr); }
.grid.c4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
}
.card:hover { border-color: #b9cbdd; }
.card .num {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 1px;
  margin-bottom: 8px;
}
.card p { color: var(--ink-2); font-size: 15px; margin: 0; }
.card a.more { display: inline-block; margin-top: 12px; font-size: 14px; font-weight: 600; }

/* ---------- 列表 ---------- */
ul.ticks { list-style: none; padding: 0; margin: 0; }
ul.ticks li { position: relative; padding-left: 20px; margin-bottom: 8px; color: var(--ink-2); }
ul.ticks li::before {
  content: "";
  position: absolute; left: 0; top: .72em;
  width: 7px; height: 7px;
  background: var(--accent);
  border-radius: 2px;
}

/* ---------- 数据表 ---------- */
table.spec {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
  margin-top: 8px;
}
table.spec th, table.spec td {
  border: 1px solid var(--line);
  padding: 11px 14px;
  text-align: left;
  vertical-align: top;
}
table.spec th { background: var(--bg-soft); width: 168px; font-weight: 600; }

/* ---------- FAQ ---------- */
.faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 14px;
  background: #fff;
}
.faq-item h3 { font-size: 17px; margin: 0 0 8px; color: var(--navy); }
.faq-item p { margin: 0; color: var(--ink-2); }

/* ---------- 面包屑 ---------- */
.crumbs { font-size: 13px; color: var(--ink-2); padding: 16px 0 0; }
.crumbs a { color: var(--ink-2); }
.crumbs span { margin: 0 6px; color: #a9b7c4; }

/* ---------- 页脚 ---------- */
.site-footer { background: var(--navy); color: #b6c8d9; padding: 46px 0 28px; font-size: 14px; }
.site-footer h4 { color: #fff; font-size: 15px; margin: 0 0 12px; }
.site-footer a { color: #d6e2ee; }
.site-footer .fgrid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 28px; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 7px; }
.site-footer .copy {
  border-top: 1px solid rgba(255,255,255,.12);
  margin-top: 30px; padding-top: 18px;
  font-size: 13px; color: #8ba3ba;
}

/* ---------- 提示条 ---------- */
.notice {
  background: #fff7ed;
  border-left: 4px solid var(--accent);
  padding: 14px 18px;
  font-size: 14px;
  color: #7a4a15;
  border-radius: 0 6px 6px 0;
  margin-bottom: 24px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .grid.c3, .grid.c4 { grid-template-columns: repeat(2, 1fr); }
  .site-footer .fgrid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 620px) {
  .grid.c2, .grid.c3, .grid.c4 { grid-template-columns: 1fr; }
  .site-footer .fgrid { grid-template-columns: 1fr; }
  .hero { padding: 48px 0 40px; }
  .hero h1 { font-size: 26px; }
  .section { padding: 42px 0; }
  table.spec th { width: 120px; }
}

/* ---------- Markdown 正文元素 ---------- */
p.figure { margin: 22px 0; }
p.figure img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}
.crumbs .sep { margin: 0 6px; color: #a9b7c4; }

h3.q {
  font-size: 18px;
  color: var(--navy);
  margin: 26px 0 8px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
h3.q:first-of-type { border-top: none; padding-top: 0; margin-top: 8px; }
.section p + h3.q { margin-top: 26px; }