:root {
  --paper: #f3efe6;
  --card: #faf8f3;
  --ink: #1c1914;
  --muted: #5e584e;
  --line: #d9d1c3;
  --green: #1d4a38;
  --green-deep: #143628;
  color: var(--ink);
  background: var(--paper);
  font-family: "Noto Sans CJK SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.55;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
}

a { color: var(--green); }

.bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 980px;
  margin: 0 auto;
  padding: 22px 24px 8px;
}

.mark {
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.08em;
  font-weight: 650;
}

.bar-link {
  text-decoration: none;
  border-bottom: 1px solid var(--green);
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 12px 24px 64px;
}

.letterhead {
  padding: 28px 0 8px;
  border-top: 2px solid var(--ink);
}

.eyebrow {
  margin: 18px 0 8px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

h1, h2 {
  font-family: "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  font-weight: 600;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.1rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
}

.lead {
  max-width: 38rem;
  color: var(--muted);
  font-size: 1.05rem;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 28px 0 8px;
  padding: 0;
  list-style: none;
}

.steps li {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.steps span {
  display: block;
  color: var(--green);
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}

.steps strong { display: block; margin: 6px 0 4px; }

.steps p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.desk {
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  gap: 28px;
  margin-top: 36px;
}

.facts h2, .sheet h2 { margin: 0 0 14px; font-size: 1.45rem; }

dl { margin: 0; }

dl div { padding: 12px 0; border-top: 1px solid var(--line); }

dt { color: var(--muted); font-size: 0.82rem; letter-spacing: 0.06em; }

dd { margin: 4px 0 0; }

.sheet {
  background: var(--card);
  border: 1px solid var(--line);
  padding: 22px 22px 18px;
}

label {
  display: block;
  margin: 0 0 14px;
  font-size: 0.92rem;
}

input, textarea {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: inherit;
}

textarea { min-height: 140px; resize: vertical; }

input:focus, textarea:focus {
  outline: 2px solid var(--green);
  outline-offset: 1px;
}

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.trap {
  position: absolute;
  left: -9999px;
  height: 0;
  overflow: hidden;
}

button {
  appearance: none;
  border: 0;
  background: var(--green);
  color: #f7f4ee;
  font: inherit;
  letter-spacing: 0.12em;
  padding: 11px 28px;
  cursor: pointer;
}

button:hover { background: var(--green-deep); }

button:disabled { opacity: 0.55; cursor: wait; }

.status { min-height: 1.5em; margin: 12px 0 0; color: var(--green-deep); }

.status[data-kind="error"] { color: #8a2e24; }

footer {
  max-width: 980px;
  margin: 0 auto;
  padding: 18px 24px 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

footer p { margin: 0; }

@media (max-width: 800px) {
  .steps, .desk, .pair { grid-template-columns: 1fr; }
  .bar, main, footer { padding-left: 16px; padding-right: 16px; }
}