:root {
  --paper: #F5F2EB;
  --card: #FFFDF8;
  --ink: #1C1B19;
  --muted: #6B675F;
  --rule: #D9D3C7;
  --accent: #B4380A;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "PingFang TC", "Hiragino Sans GB", "Noto Sans SC", "Noto Sans TC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #151412;
    --card: #1E1D1A;
    --ink: #ECE8DF;
    --muted: #A39E93;
    --rule: #3A3732;
    --accent: #E0703F;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.75 var(--sans);
}
a { color: var(--accent); text-underline-offset: 2px; }

.wrap { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; }

header.top {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding-bottom: 16px; border-bottom: 1px dashed var(--rule); margin-bottom: 24px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 600; }
.brand img { width: 32px; height: 32px; border-radius: 8px; }
.lang { font-size: 14px; display: flex; gap: 10px; flex-wrap: wrap; }
.lang a { text-decoration: none; color: var(--muted); }
.lang a[aria-current] { color: var(--ink); font-weight: 600; }

.receipt {
  background: var(--card);
  border-radius: 6px;
  padding: 28px 24px;
  box-shadow: 0 1px 0 var(--rule), 0 8px 24px rgba(0, 0, 0, .05);
}
@media (max-width: 480px) { .receipt { padding: 22px 16px; } }

h1 { font-size: 26px; line-height: 1.35; margin: 0 0 6px; }
h2 { font-size: 19px; margin: 36px 0 8px; padding-top: 16px; border-top: 1px dashed var(--rule); }
h3 { font-size: 16px; margin: 22px 0 4px; }
.meta { font-family: var(--mono); font-size: 13px; color: var(--muted); margin: 0 0 20px; }
.summary {
  border-left: 3px solid var(--accent); padding: 10px 14px; margin: 20px 0;
  background: color-mix(in srgb, var(--accent) 7%, transparent);
}
.summary p { margin: 4px 0; }
ul, ol { padding-left: 1.4em; }
li { margin: 4px 0; }

.table-scroll { overflow-x: auto; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; font-size: 14px; min-width: 520px; }
th, td { border: 1px solid var(--rule); padding: 8px 10px; text-align: left; vertical-align: top; }
th { background: color-mix(in srgb, var(--ink) 5%, transparent); font-weight: 600; }
code { font-family: var(--mono); font-size: .9em; }

.toc { font-size: 15px; }
.toc ol { margin: 6px 0; }

.hero { text-align: center; padding: 24px 0 8px; }
.hero img { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 6px 20px rgba(0,0,0,.12); }
.hero h1 { margin-top: 16px; }
.hero p { color: var(--muted); margin: 4px 0; }
.links { display: grid; gap: 12px; margin-top: 24px; }
.links a {
  display: block; padding: 14px 16px; border: 1px solid var(--rule); border-radius: 8px;
  color: var(--ink); text-decoration: none; background: var(--card);
}
.links a span { display: block; font-size: 14px; color: var(--muted); }

footer {
  margin-top: 32px; font-size: 13px; color: var(--muted); text-align: center;
  font-family: var(--mono);
}
footer a { color: var(--muted); }

.features {
  list-style: none; padding: 16px 20px; margin: 24px 0 0;
  background: var(--card); border-radius: 8px; border: 1px dashed var(--rule);
}
.features li { padding: 6px 0 6px 22px; position: relative; }
.features li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-family: var(--mono); }