/* 北京诚立会计（集团）有限公司 · 官网样式 */
:root {
  --ink: #17222f;
  --ink-2: #3d4d5e;
  --muted: #6b7c8d;
  --line: #e3e9ef;
  --bg: #ffffff;
  --bg-soft: #f5f8fb;
  --bg-soft-2: #eef4fa;
  --brand: #16588f;
  --brand-dark: #0f4269;
  --brand-light: #e8f1f9;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 40, 66, .06), 0 8px 24px rgba(16, 40, 66, .05);
  --maxw: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  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: 1.78;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- 页头 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .96);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 20px; min-height: 74px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid; place-items: center;
  width: 46px; height: 46px; border-radius: 8px;
  background: linear-gradient(135deg, var(--brand), var(--brand-dark));
  color: #fff; font-weight: 700; font-size: 17px; letter-spacing: 1px;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.35; }
.brand-text strong { font-size: 16px; letter-spacing: .2px; }
.brand-text small { color: var(--muted); font-size: 12px; }

.nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav a { padding: 7px 12px; border-radius: 6px; color: var(--ink-2); font-size: 14.5px; white-space: nowrap; }
.nav a:hover { background: var(--brand-light); color: var(--brand-dark); text-decoration: none; }
.nav a.active { background: var(--brand); color: #fff; }

.header-tel { text-align: right; line-height: 1.3; }
.header-tel span { display: block; color: var(--muted); font-size: 12px; }
.header-tel strong { color: var(--brand-dark); font-size: 17px; letter-spacing: .3px; }

/* ---------- 通用板块 ---------- */
main > section { padding: 46px 20px; }
main > section + section { border-top: 1px solid var(--line); }
h1 { font-size: 31px; line-height: 1.35; margin: 0 0 16px; letter-spacing: -.3px; }
h2 { font-size: 23px; margin: 0 0 18px; letter-spacing: -.2px; }
h3 { font-size: 17.5px; margin: 0 0 10px; }
h4 { font-size: 15px; margin: 0 0 8px; }
p { margin: 0 0 14px; }
.lead { font-size: 17px; color: var(--ink-2); max-width: 82ch; }
.muted { color: var(--muted); font-size: 14px; }
.center { text-align: center; }
.big { font-size: 19px; font-weight: 600; color: var(--brand-dark); }

/* ---------- 首屏 ---------- */
.hero {
  background: linear-gradient(160deg, var(--bg-soft-2) 0%, #fbfdff 60%, #fff 100%);
  padding: 62px 20px 54px !important;
  border-bottom: 1px solid var(--line);
}
.hero h1 { font-size: 38px; max-width: 20ch; }
.hero .lead { font-size: 17.5px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 26px 0 30px; }
.hero-points { display: flex; flex-wrap: wrap; gap: 10px; list-style: none; padding: 0; margin: 0; }
.hero-points li {
  background: #fff; border: 1px solid var(--line); border-radius: 999px;
  padding: 7px 16px; font-size: 14px; color: var(--ink-2); box-shadow: var(--shadow);
}

/* ---------- 按钮 ---------- */
.btn { display: inline-block; padding: 12px 24px; border-radius: 8px; font-size: 15.5px; font-weight: 600; transition: .18s; }
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 6px 16px rgba(22, 88, 143, .22); }
.btn-primary:hover { background: var(--brand-dark); }
.btn-ghost { background: #fff; color: var(--brand-dark); border: 1px solid var(--line); }
.btn-ghost:hover { border-color: var(--brand); background: var(--brand-light); }

/* ---------- 卡片 ---------- */
.cards { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(268px, 1fr)); }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow); display: flex; flex-direction: column;
}
.card h3 { color: var(--brand-dark); }
.card p { color: var(--ink-2); font-size: 15px; }
.card > a:last-child { margin-top: auto; font-weight: 600; font-size: 14.5px; }

/* ---------- 列表 ---------- */
.feature-list { list-style: none; padding: 0; margin: 0; }
.feature-list li { position: relative; padding: 12px 0 12px 26px; border-bottom: 1px dashed var(--line); color: var(--ink-2); }
.feature-list li:last-child { border-bottom: 0; }
.feature-list li::before { content: ""; position: absolute; left: 4px; top: 22px; width: 8px; height: 8px; border-radius: 2px; background: var(--brand); }

/* ---------- 表格 ---------- */
.tbl { width: 100%; border-collapse: collapse; margin: 0 0 16px; font-size: 15px; }
.tbl th, .tbl td { border: 1px solid var(--line); padding: 13px 15px; text-align: left; vertical-align: top; }
.tbl th { background: var(--bg-soft); color: var(--brand-dark); width: 148px; font-weight: 600; white-space: nowrap; }
.tbl td { color: var(--ink-2); }
.tbl tbody tr:nth-child(even) td { background: #fcfdfe; }

/* ---------- FAQ ---------- */
.toc { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 4px; }
.toc a { padding: 6px 14px; border: 1px solid var(--line); border-radius: 999px; font-size: 14px; background: #fff; }
.toc a:hover { border-color: var(--brand); background: var(--brand-light); text-decoration: none; }

.faq-list { border-top: 1px solid var(--line); }
.faq-item { padding: 20px 0; border-bottom: 1px solid var(--line); }
.faq-item h3 { color: var(--brand-dark); margin-bottom: 8px; font-size: 17px; }
.faq-item p { color: var(--ink-2); margin: 0; }

.qa-mini details { border: 1px solid var(--line); border-radius: 8px; padding: 14px 18px; margin-bottom: 10px; background: #fff; }
.qa-mini summary { cursor: pointer; font-weight: 600; color: var(--brand-dark); }
.qa-mini details[open] summary { margin-bottom: 8px; }
.qa-mini p { margin: 0; color: var(--ink-2); font-size: 15px; }

/* ---------- CTA 条 ---------- */
.cta-band {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  flex-wrap: wrap; background: var(--bg-soft-2); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 26px 28px;
}
.cta-band h3 { margin-bottom: 4px; }
.cta-band p { margin: 0; color: var(--ink-2); }

/* ---------- 文章页 ---------- */
.crumb { font-size: 14px; color: var(--muted); margin-bottom: 14px; }
.article h1 { font-size: 30px; }
.article-body { max-width: 78ch; }
.article-body h2 { margin-top: 38px; padding-top: 6px; }
.article-body h3 { margin-top: 24px; color: var(--brand-dark); }
.article-body ul, .article-body ol { color: var(--ink-2); padding-left: 22px; }
.article-body li { margin-bottom: 6px; }
.article-body table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: 15px; }
.article-body th, .article-body td { border: 1px solid var(--line); padding: 11px 13px; text-align: left; }
.article-body th { background: var(--bg-soft); color: var(--brand-dark); }
.article-body blockquote {
  margin: 20px 0; padding: 14px 18px; background: var(--bg-soft);
  border-left: 3px solid var(--brand); border-radius: 0 8px 8px 0; color: var(--ink-2); font-size: 15px;
}
.article-body blockquote p:last-child { margin: 0; }
.article-body code { background: var(--bg-soft); padding: 2px 6px; border-radius: 4px; font-size: .9em; color: var(--brand-dark); }
.article-body hr { border: 0; border-top: 1px solid var(--line); margin: 30px 0; }
.article-body > p:first-of-type { font-size: 17px; color: var(--ink-2); }

.article-brand {
  margin: 40px 0 0; padding: 22px 24px; border-radius: var(--radius);
  background: var(--bg-soft-2); border: 1px solid var(--line); max-width: 78ch;
}
.article-brand h3 { color: var(--brand-dark); }
.article-brand p { font-size: 15px; color: var(--ink-2); margin-bottom: 8px; }
.article-brand p:last-child { margin: 0; }
.disclaimer { color: var(--muted); font-size: 13.5px; margin-top: 14px; }

/* ---------- 关于 ---------- */
.prose { max-width: 82ch; }
.tree {
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 8px;
  padding: 18px 20px; font-size: 14px; line-height: 1.9; overflow-x: auto;
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace; color: var(--ink-2);
}

/* ---------- 联系 ---------- */
.contact-grid { display: grid; gap: 18px; margin-bottom: 34px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.contact-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.contact-card h3 { color: var(--muted); font-size: 13px; letter-spacing: 1px; text-transform: uppercase; }
.contact-big { font-size: 30px; font-weight: 700; color: var(--brand); margin: 0 0 6px; letter-spacing: .5px; }
.contact-big-sm { font-size: 18px; font-weight: 600; color: var(--brand-dark); margin: 0 0 6px; }

/* ---------- 页脚 ---------- */
.site-footer { background: #14273a; color: #cdd9e5; margin-top: 10px; }
.footer-grid { display: grid; gap: 28px; padding-top: 40px; padding-bottom: 28px; grid-template-columns: 1.5fr 1fr 1fr; }
.site-footer h4 { color: #fff; font-size: 15px; margin-bottom: 10px; }
.site-footer p { font-size: 14px; line-height: 1.8; margin: 0 0 8px; }
.site-footer a { color: #9fc4e6; }
.site-footer .muted { color: #8fa3b6; font-size: 13px; }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .1); padding-top: 16px; padding-bottom: 22px; }
.footer-bottom p { font-size: 13px; color: #8fa3b6; margin: 0; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .header-inner { gap: 12px; padding-top: 10px; padding-bottom: 10px; }
  .nav { order: 3; width: 100%; margin-left: 0; overflow-x: auto; padding-bottom: 4px; }
  .header-tel { margin-left: auto; }
  .hero h1 { font-size: 28px; }
  .hero { padding: 40px 20px 36px !important; }
  h1 { font-size: 25px; }
  h2 { font-size: 20px; }
  .footer-grid { grid-template-columns: 1fr; gap: 20px; }
  .cta-band { padding: 22px; }
  main > section { padding: 34px 20px; }
  .tbl th { width: auto; }
}