:root {
  --bg: #eef1ec;
  --paper: #f7f8f4;
  --ink: #243028;
  --muted: #5a675e;
  --dim: #7a877d;
  --line: #7a8f7a;
  --soft: color-mix(in srgb, var(--line) 28%, var(--bg));
  --ok: #3f5c45;
  --warn: #6a5340;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", ui-sans-serif, system-ui, sans-serif;
  --serif: "Songti SC", "STSong", "Noto Serif CJK SC", Georgia, serif;
  --mono: "SFMono-Regular", ui-monospace, Menlo, Consolas, monospace;
  --page: min(36rem, calc(100vw - 3.6rem));
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font: 17px/1.9 var(--sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
button, input, textarea { font: inherit; color: inherit; }
a { color: var(--ok); text-underline-offset: 0.2em; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--line); outline-offset: 3px;
}
.skip {
  position: absolute; left: 12px; top: 12px; z-index: 20;
  padding: 8px 12px; background: var(--ink); color: var(--bg);
  transform: translateY(-160%);
}
.skip:focus { transform: none; }
.top {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 5vw;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  border-bottom: 1px solid var(--soft);
  backdrop-filter: blur(12px);
}
.top a { color: var(--muted); text-decoration: none; font: 700 12px/1 var(--mono); letter-spacing: 0.08em; }
.top a:hover { color: var(--ink); }
.top strong { font: 700 15px/1 var(--serif); letter-spacing: 0.06em; }
.rail {
  width: var(--page); margin: 1.4rem auto 0;
  display: flex; flex-wrap: wrap; gap: 10px 18px;
  font: 700 11px/1 var(--mono); letter-spacing: 0.06em;
}
.rail a { color: var(--dim); text-decoration: none; }
.rail a[aria-current] { color: var(--ink); border-bottom: 1px solid var(--line); padding-bottom: 2px; }
main { width: var(--page); margin: 0 auto; padding: 3.4rem 0 5.5rem; }
.kicker { margin: 0 0 18px; color: var(--line); font: 700 11px/1.4 var(--mono); letter-spacing: 0.16em; }
h1 {
  margin: 0 0 28px;
  font: 700 clamp(28px, 5.6vw, 42px)/1.28 var(--serif);
  letter-spacing: 0.01em;
  text-wrap: balance;
}
h2 {
  margin: 2.8rem 0 16px;
  font: 700 22px/1.35 var(--serif);
}
p, li { margin: 0 0 1.15em; }
p.lead { font-size: 18px; }
.hint, .muted { color: var(--muted); }
.path { list-style: none; padding: 0; margin: 2.6rem 0 3rem; }
.path li {
  border-top: 1px solid var(--soft);
  padding: 22px 0;
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 16px;
}
.path li:last-child { border-bottom: 1px solid var(--soft); }
.path time { color: var(--line); font: 700 12px/1.6 var(--mono); }
.path a { color: var(--ink); font-weight: 700; text-decoration: none; font-family: var(--serif); font-size: 20px; }
.path a:hover { color: var(--ok); }
.path small { display: block; color: var(--muted); font-weight: 400; margin-top: 8px; font-size: 15px; }
.cols {
  display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 18px;
  margin: 2rem 0 2.4rem;
}
.col {
  padding: 20px 16px 22px;
  background: var(--paper);
  border: 1px solid var(--soft);
  min-height: 8.5rem;
}
.col h3 {
  margin: 0 0 10px;
  font: 700 13px/1.3 var(--serif);
  letter-spacing: 0.1em;
  color: var(--ok);
}
.col p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.dialogue { margin: 1.8rem 0 2rem; }
.dialogue p {
  margin: 0;
  padding: 14px 0;
  border-bottom: 1px dashed var(--soft);
}
.dialogue p:last-child { border-bottom: 0; }
.dialogue b { font-weight: 650; margin-right: 0.45em; color: var(--ok); }
.wechat {
  margin: 1.8rem 0;
  padding: 22px 20px;
  background: var(--paper);
  border: 1px solid var(--soft);
}
.wechat .from {
  margin: 0 0 10px;
  color: var(--dim);
  font: 700 11px/1 var(--mono);
  letter-spacing: 0.1em;
}
.wechat p { margin: 0; }
.utter { display: grid; gap: 18px; margin: 1.6rem 0; }
.utter article {
  padding: 18px 18px 14px;
  background: var(--paper);
  border-left: 3px solid var(--line);
}
.utter blockquote {
  margin: 0 0 12px;
  font: 600 18px/1.5 var(--serif);
}
.picks { display: flex; flex-wrap: wrap; gap: 10px 20px; }
.picks label { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; color: var(--muted); font-size: 15px; }
.picks input { accent-color: var(--line); }
.choices { display: grid; gap: 10px; margin: 1.4rem 0; }
.choices button, .act, .grade, .script button, #notes-form button {
  min-height: 48px;
  padding: 12px 16px;
  text-align: left;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
}
.choices button:hover, .act:hover, .grade:hover { background: color-mix(in srgb, var(--line) 12%, var(--bg)); }
.choices button.is-ok { border-color: var(--ok); color: var(--ok); }
.choices button.is-bad, .choices button.is-trap { border-color: var(--warn); color: var(--warn); }
.out {
  margin: 14px 0 0;
  padding: 14px 16px;
  background: var(--paper);
  border-left: 3px solid var(--line);
}
.out.is-ok { border-color: var(--ok); }
.out.is-bad { border-color: var(--warn); }
.script, #notes-form { display: grid; gap: 14px; margin: 1.2rem 0 0; }
.script label, #notes-form label { display: grid; gap: 8px; font-weight: 650; }
.script textarea, #notes-form textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--soft);
  background: var(--paper);
  resize: vertical;
  min-height: 4.8rem;
}
.script .opt { font-weight: 400; color: var(--muted); font-size: 14px; }
.scenes { display: grid; gap: 18px; margin: 1.6rem 0; }
.scene {
  padding: 18px 18px 16px;
  background: var(--paper);
  border: 1px solid var(--soft);
}
.scene p { margin: 0 0 12px; }
.scene fieldset {
  border: 0; margin: 0; padding: 0;
  display: flex; flex-wrap: wrap; gap: 12px 22px;
}
.scene legend { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.danger {
  margin: 0 0 2.2rem;
  padding: 22px 22px 18px;
  border: 1.5px solid var(--ink);
  background: var(--paper);
}
.danger h2 { margin: 0 0 12px; font-size: 22px; }
.danger ul { margin: 0.5rem 0 0.8rem; padding-left: 1.2rem; }
.danger a { font-weight: 700; }
.order { display: grid; gap: 10px; margin: 1.2rem 0; }
.order button {
  min-height: 52px;
  padding: 12px 14px;
  text-align: left;
  border: 1px dashed var(--line);
  background: var(--paper);
  cursor: pointer;
}
.order button.is-used { opacity: 0.4; }
.stack {
  margin: 14px 0;
  padding: 0;
  list-style: none;
  min-height: 3rem;
  border-left: 3px solid var(--line);
}
.stack li { padding: 10px 14px; border-bottom: 1px solid var(--soft); }
.stack .n { display: inline-block; width: 1.6rem; color: var(--line); font: 700 12px/1 var(--mono); }
.grade, .act, .script button, #notes-form button {
  justify-self: start;
  min-width: 7.5rem;
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
  font-weight: 700;
}
.grade:hover, .act:hover, .script button:hover, #notes-form button:hover {
  background: var(--ok); border-color: var(--ok); color: #fff;
}
.saved { margin: 0; color: var(--ok); font-size: 14px; }
.next { margin-top: 3rem; }
.foot {
  width: var(--page); margin: 0 auto; padding: 24px 0 56px;
  display: flex; justify-content: space-between; gap: 16px;
  border-top: 1px solid var(--soft); color: var(--dim); font-size: 13px;
}
.foot a { font: 700 11px/1 var(--mono); letter-spacing: 0.08em; text-decoration: none; }
@media (max-width: 720px) {
  :root { --page: calc(100vw - 2rem); }
  .cols { grid-template-columns: 1fr; }
  .path li { grid-template-columns: 1fr; }
  .foot { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
@media print {
  .top, .skip, .choices button, .grade, .act, #notes-form button, .order { display: none !important; }
  body { background: #fff; }
}

.top.plain { display: flex; justify-content: space-between; align-items: center; }
.home { color: var(--muted); text-decoration: none; font: 700 12px/1 var(--mono); letter-spacing: 0.08em; }
.home:hover { color: var(--ink); }
.progress {
  width: var(--page); margin: 1.4rem auto 0;
  display: flex; flex-wrap: wrap; gap: 10px 18px;
  font: 700 11px/1 var(--mono); letter-spacing: 0.06em;
}
.progress a { color: var(--dim); text-decoration: none; }
.progress a[aria-current] { color: var(--ink); border-bottom: 1px solid var(--line); padding-bottom: 2px; }
.teach h2, .do h2 { margin: 2.8rem 0 16px; font: 700 22px/1.35 var(--serif); }
.teach p { color: var(--ink); }
.lede { margin: 0 0 28px; color: var(--muted); font-size: 18px; line-height: 1.9; }
.ex {
  margin: 18px 0; padding: 18px 18px;
  background: var(--paper); border-left: 3px solid var(--line);
  color: var(--ink); font: 15px/1.8 var(--sans);
}
.ex ol { margin: 8px 0 0; padding-left: 1.2rem; }
.ex li { margin: 8px 0; color: var(--muted); }
.leave { color: var(--muted); }
.hero-links { display: flex; flex-wrap: wrap; gap: 18px 28px; margin: 28px 0 0; }
.foot strong { color: var(--ink); margin-right: 12px; }
.block { display: grid; gap: 8px; margin: 18px 0 8px; color: var(--ink); font-weight: 650; }