/* landing 主题 —— 「柜台台账」
   世界：小票、价签、台账、算账。一个记忆点：左侧印泥红竖线；
   其余克制：白纸、发丝线、无阴影、无渐变、圆角 2px。 */

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--c-dark);
  background: var(--c-light);
}

.wrap { max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 52rem; }

a { color: var(--c-accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 4px; }

:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; }

/* ---------- 顶栏 ---------- */

.topbar {
  background: var(--c-light);
  border-bottom: 1px solid var(--c-line);
  position: sticky; top: 0; z-index: 10;
}
.topbar-in { display: flex; align-items: center; gap: 28px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--c-dark); }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px;
  background: var(--c-dark); color: var(--c-hero-fg);
  font-weight: 700; border-radius: var(--radius);
}
.brand-name { font-weight: 700; font-size: 17px; }
.topnav { display: flex; gap: 22px; margin-left: auto; }
.topnav a { color: var(--c-dark); font-size: 15px; }
.topnav a:hover { color: var(--c-accent); text-decoration: none; border-bottom: 2px solid var(--c-accent); }
.topbar-cta { margin-left: 8px; }

@media (max-width: 720px) {
  .topnav { display: none; }
  .topbar-cta { margin-left: auto; }
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-block; padding: 10px 22px;
  font-size: 15px; line-height: 1.5; border-radius: var(--radius);
  border: 1px solid transparent; cursor: pointer;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--c-accent); color: #fff; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { border-color: var(--c-line-dark); color: inherit; background: transparent; }
.btn-ghost:hover { border-color: var(--c-dark); }
.btn-inverse { background: var(--c-hero-fg); color: var(--c-accent); font-weight: 600; }
.btn-outline { border-color: rgba(255,255,255,.55); color: var(--c-hero-fg); }

/* ---------- 品牌横幅 ---------- */

.hero { background: var(--c-hero-bg); color: var(--c-hero-fg); }
.hero-in { padding: 72px 24px 84px; }
.hero-eyebrow {
  font-size: 14px; color: var(--c-hero-fg); opacity: .72;
  border-left: 3px solid var(--c-accent); padding-left: 10px;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 5vw, 3.2rem);
  font-weight: 800; letter-spacing: .02em; line-height: 1.25;
  margin: 18px 0 14px;
}
.hero-sub { max-width: 42em; font-size: 17px; opacity: .82; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }

/* ---------- 区块 ---------- */

.band { padding: 56px 0; }
.band-paper { background: var(--c-muted); }
.band-title {
  font-size: 1.35rem; font-weight: 700;
  border-left: 4px solid var(--c-accent); padding-left: 12px;
  margin-bottom: 28px;
}

/* ---------- 核心卖点：台账行 ---------- */

.ledger { border-top: 1px solid var(--c-line-dark); }
.ledger-row {
  display: grid; grid-template-columns: 15rem 1fr; gap: 8px 32px;
  padding: 20px 4px;
  border-bottom: 1px solid var(--c-line);
}
.ledger-t { font-size: 16.5px; font-weight: 700; }
.ledger-d { color: var(--c-dark); opacity: .88; }
@media (max-width: 720px) {
  .ledger-row { grid-template-columns: 1fr; }
}

/* ---------- 正文（功能与方案 / 文章） ---------- */

.doc-body { font-size: 16px; }
.doc-body h2 {
  font-size: 1.3rem; font-weight: 700;
  border-left: 4px solid var(--c-accent); padding-left: 12px;
  margin: 44px 0 16px;
}
.doc-body h2:first-child { margin-top: 0; }
.doc-body h3 { font-size: 1.08rem; margin: 28px 0 10px; }
.doc-body p { margin: 12px 0; }
.doc-body ul, .doc-body ol { margin: 12px 0; padding-left: 1.6em; }
.doc-body li { margin: 6px 0; }
.doc-body blockquote {
  border-left: 3px solid var(--c-line-dark);
  padding: 4px 16px; margin: 16px 0; color: var(--c-dark); opacity: .8;
}
.doc-body code {
  font-family: ui-monospace, 'SF Mono', Consolas, Menlo, monospace;
  font-size: .9em; background: var(--c-muted); padding: 2px 6px; border-radius: var(--radius);
}
.doc-body pre {
  background: var(--c-dark); color: var(--c-hero-fg);
  padding: 16px 18px; border-radius: var(--radius);
  overflow-x: auto; margin: 16px 0; line-height: 1.6;
}
.doc-body pre code { background: none; padding: 0; color: inherit; }
.doc-body table {
  width: 100%; border-collapse: collapse; margin: 20px 0;
  font-size: 15px; font-variant-numeric: tabular-nums;
}
.doc-body th, .doc-body td {
  border: 1px solid var(--c-line); padding: 9px 12px; text-align: left; vertical-align: top;
}
.doc-body th { background: var(--c-muted); font-weight: 700; white-space: nowrap; }
.doc-body tbody tr:nth-child(even) { background: var(--c-muted); }
.doc-body img { max-width: 100%; height: auto; }
.doc-body hr { border: 0; border-top: 1px dashed var(--c-line-dark); margin: 28px 0; }

/* ---------- FAQ ---------- */

.faq details { border-bottom: 1px solid var(--c-line); }
.faq summary {
  list-style: none; cursor: pointer;
  display: flex; align-items: baseline; gap: 12px;
  padding: 16px 4px; font-weight: 600; font-size: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before {
  content: ""; width: 10px; height: 10px; flex: none;
  border-right: 2px solid var(--c-accent); border-bottom: 2px solid var(--c-accent);
  transform: translateY(-1px) rotate(-45deg);
  transition: transform .15s ease;
}
.faq details[open] summary::before { transform: translateY(2px) rotate(45deg); }
.faq-a { padding: 0 4px 18px 34px; color: var(--c-dark); opacity: .88; }

/* ---------- 行业新闻：小票 ---------- */

.receipt { list-style: none; }
.receipt-row {
  display: flex; align-items: baseline; gap: 20px;
  padding: 13px 4px; border-bottom: 1px dashed var(--c-line-dark);
}
.receipt-t { color: var(--c-dark); font-weight: 500; }
.receipt-t:hover { color: var(--c-accent); }
.receipt-date {
  margin-left: auto; flex: none;
  font-variant-numeric: tabular-nums; font-size: 14px; opacity: .62;
}
.more-link { margin-top: 18px; font-weight: 600; }

/* ---------- CTA 带 ---------- */

.cta-band { background: var(--c-accent); color: #fff; }
.cta-in { padding: 52px 24px; }
.cta-title { font-size: 1.5rem; font-weight: 800; }
.cta-sub { margin: 10px 0 24px; opacity: .9; }
.cta-sub a { color: inherit; text-decoration: underline; text-underline-offset: 3px; }
.cta-in .btn { margin-right: 14px; }

/* ---------- 文章页 / 页面 ---------- */

.crumb { font-size: 14px; opacity: .78; padding: 20px 0 0; }
.crumb span { margin: 0 6px; }
.crumb-cur { opacity: 1; }
.doc { padding-bottom: 64px; }
.doc-title { font-size: 1.7rem; font-weight: 800; line-height: 1.4; margin: 10px 0 8px; }
.doc-meta {
  display: flex; flex-wrap: wrap; gap: 6px 20px;
  font-size: 14px; opacity: .68; margin-bottom: 20px;
  font-variant-numeric: tabular-nums;
}
.doc-lead {
  font-size: 17px; padding: 4px 0 4px 14px;
  border-left: 3px solid var(--c-line-dark); opacity: .85;
}
.doc .doc-body h2:first-of-type { margin-top: 28px; }
.arch-year { margin-top: 36px; }
.arch-yh { font-size: 1.1rem; font-weight: 700; font-variant-numeric: tabular-nums; margin-bottom: 6px; }

.pager {
  display: flex; gap: 16px; align-items: center;
  border-top: 1px solid var(--c-line); margin-top: 40px; padding-top: 20px;
  font-size: 14px;
}
.pager-a { color: var(--c-dark); }
.pager-a strong { display: block; font-size: 15px; margin-top: 2px; }
.pager-a:hover strong { color: var(--c-accent); }
.pager-mid { margin: 0 auto; opacity: .75; }

.tagcloud { display: flex; flex-wrap: wrap; gap: 10px; }
.pill {
  display: inline-block; padding: 3px 12px; font-size: 14px;
  border: 1px solid var(--c-line-dark); border-radius: 999px; color: var(--c-dark);
}
.pill:hover { border-color: var(--c-accent); color: var(--c-accent); text-decoration: none; }

/* ---------- 页脚 ---------- */

.footer { border-top: 1px solid var(--c-line); background: var(--c-light); }
.footer-in {
  display: flex; flex-wrap: wrap; gap: 8px 26px;
  padding: 26px 24px; font-size: 13.5px; opacity: .78;
}
.footer a { color: inherit; }

@media (prefers-reduced-motion: reduce) {
  .faq summary::before { transition: none; }
}