:root {
  --bg: #f7f4ea;
  --sticky: #fff8d6;
  --ink: #222222;
  --muted: #5c574c;
  --dim: #8a8374;
  --hi: #e0c35a;
  --hi-deep: #c9a73a;
  --ok: #3d5a3a;
  --bad: #8a4a32;
  --line: #d9d0b8;
  --tape: #efe6c0;
  --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(40rem, calc(100vw - 2.8rem));
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    linear-gradient(90deg, rgba(34, 34, 34, 0.035) 1px, transparent 1px),
    linear-gradient(rgba(34, 34, 34, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  font: 16.5px/1.75 var(--sans);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
button, input, textarea { font: inherit; color: inherit; }
a { color: #5a4a12; text-underline-offset: 0.18em; }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--hi-deep); outline-offset: 3px;
}
.skip {
  position: absolute; left: 12px; top: 12px; z-index: 20;
  padding: 8px 12px; background: var(--ink); color: var(--sticky);
  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: 12px 4vw;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.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); }
.rail {
  width: var(--page); margin: 1rem auto 0;
  display: flex; flex-wrap: wrap; gap: 8px 16px;
  font: 700 11px/1 var(--mono); letter-spacing: 0.05em;
}
.rail a { color: var(--dim); text-decoration: none; }
.rail a[aria-current] { color: var(--ink); border-bottom: 2px solid var(--hi); padding-bottom: 2px; }
main { width: var(--page); margin: 0 auto; padding: 2.8rem 0 4.8rem; }
.kicker { margin: 0 0 12px; color: var(--hi-deep); font: 700 11px/1.4 var(--mono); letter-spacing: 0.14em; }
h1 {
  margin: 0 0 16px;
  font: 700 clamp(28px, 5.2vw, 42px)/1.22 var(--serif);
  letter-spacing: -0.02em;
  text-wrap: balance;
}
h2 { margin: 2.2rem 0 14px; font: 700 22px/1.3 var(--serif); }
p { margin: 0 0 1em; }
p.lead { font-size: 17px; }
.hint, .muted { color: var(--muted); }
.board {
  list-style: none; margin: 1.8rem 0 0; padding: 0;
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.board a {
  display: flex; flex-direction: column; gap: 8px;
  min-height: 148px; padding: 16px 16px 18px;
  background: var(--sticky); color: inherit; text-decoration: none;
  box-shadow: 2px 3px 0 rgba(34, 34, 34, 0.08);
  transform: rotate(-0.5deg);
  position: relative;
}
.board li:nth-child(2) a { transform: rotate(0.7deg); background: #fff6c8; }
.board li:nth-child(3) a { transform: rotate(0.3deg); }
.board li:nth-child(4) a { transform: rotate(-0.8deg); background: #fff3b8; }
.board li:nth-child(5) a { transform: rotate(0.4deg); grid-column: 1 / -1; min-height: 118px; }
.board a::before {
  content: "";
  position: absolute; top: -8px; left: 50%;
  width: 46px; height: 14px; margin-left: -23px;
  background: color-mix(in srgb, var(--tape) 80%, transparent);
  border: 1px solid rgba(34, 34, 34, 0.08);
}
.board a:hover { transform: rotate(0) translateY(-2px); }
.board span { font: 700 11px/1 var(--mono); color: var(--hi-deep); }
.board b { font: 700 20px/1.3 var(--serif); }
.board em { margin-top: auto; font-style: normal; color: var(--muted); font-size: 14px; }
.sticky {
  margin: 1.2rem 0 1.4rem;
  padding: 18px 18px 16px;
  background: var(--sticky);
  box-shadow: 3px 4px 0 rgba(34, 34, 34, 0.07);
  position: relative;
}
.sticky::before {
  content: "";
  position: absolute; top: -7px; left: 22px;
  width: 52px; height: 13px;
  background: color-mix(in srgb, var(--tape) 85%, #fff);
  transform: rotate(-2deg);
}
.sticky .from {
  margin: 0 0 8px;
  font: 700 11px/1 var(--mono);
  letter-spacing: 0.08em;
  color: var(--dim);
}
.sticky p { margin: 0; }
.dialogue {
  margin: 1.2rem 0 1.4rem;
  padding: 4px 0 4px 14px;
  border-left: 4px solid var(--hi);
}
.dialogue p { margin: 0; padding: 6px 0; }
.dialogue b { margin-right: 0.35em; }
.fields { display: grid; gap: 12px; margin: 1rem 0; }
.fields label, #notes-form label { display: grid; gap: 6px; font-weight: 650; }
.fields textarea, #notes-form textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--line);
  background: #fffdf6;
  resize: vertical;
  min-height: 3.6rem;
}
.choices, .picks { display: grid; gap: 8px; margin: 1rem 0; }
.choices button, .picks button, .grade, .act, #notes-form button {
  min-height: 48px;
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--ink);
  background: var(--sticky);
  cursor: pointer;
  box-shadow: 2px 2px 0 rgba(34, 34, 34, 0.06);
}
.choices button:hover, .picks button:hover, .grade:hover { background: #fff3b0; }
.choices button.is-ok, .picks button.is-ok { background: #e7f0dc; }
.choices button.is-bad, .picks button.is-bad { background: #f3ddd4; }
.dump {
  margin: 1rem 0;
  padding: 16px;
  background: #fffdf6;
  border: 1px dashed var(--line);
  font-size: 15.5px;
}
.dump p { margin: 0; }
.meet { margin: 1rem 0; }
.meet p {
  margin: 0;
  padding: 8px 0;
  border-bottom: 1px dotted var(--line);
}
.out {
  margin: 12px 0 0;
  padding: 12px 14px;
  background: var(--sticky);
  border-left: 4px solid var(--hi);
}
.out.is-ok { border-color: var(--ok); }
.out.is-bad { border-color: var(--bad); }
.ai {
  margin: 1rem 0;
  padding: 16px;
  background: #fffdf6;
  border: 1px solid var(--line);
}
.ai button.num {
  display: inline;
  margin: 0;
  padding: 0 3px;
  min-height: 0;
  border: 0;
  background: linear-gradient(transparent 60%, var(--hi) 60%);
  box-shadow: none;
  cursor: pointer;
  font: inherit;
}
.ai button.num.is-struck {
  background: transparent;
  text-decoration: line-through;
  color: var(--bad);
}
.ai .src { margin-top: 12px; display: grid; gap: 6px; }
#notes-form { display: grid; gap: 10px; margin-top: 10px; }
.grade, .act, #notes-form button {
  justify-self: start;
  min-width: 7.5rem;
  background: var(--ink);
  color: var(--sticky);
  font-weight: 700;
}
.saved { margin: 0; color: var(--ok); font-size: 14px; }
.next { margin-top: 2.4rem; }
.foot {
  width: var(--page); margin: 0 auto; padding: 22px 0 48px;
  display: flex; justify-content: space-between; gap: 16px;
  border-top: 1px solid var(--line); 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 - 1.6rem); }
  .board { grid-template-columns: 1fr; }
  .board li:nth-child(5) a { grid-column: auto; }
  .foot { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .board a, .board a:hover { transform: none; }
}
@media print {
  .top, .skip, .choices, .grade, .act, #notes-form button { display: none !important; }
  body { background: #fff; }
}
main label { display: grid; gap: 6px; margin: 12px 0; font-weight: 650; }
main textarea { padding: 10px; border: 1px solid #e6d98a; background: #fffdf3; }

.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: 1rem auto 0;
  display: flex; flex-wrap: wrap; gap: 8px 16px;
  font: 700 11px/1 var(--mono); letter-spacing: 0.05em;
}
.progress a { color: var(--dim); text-decoration: none; }
.progress a[aria-current] { color: var(--ink); border-bottom: 2px solid var(--hi); padding-bottom: 2px; }
.teach h2, .do h2 { margin: 2.2rem 0 14px; font: 700 22px/1.3 var(--serif); }
.teach p { color: var(--ink); }
.lede { margin: 0 0 18px; color: var(--muted); font-size: 17px; line-height: 1.8; }
.ex {
  margin: 18px 0; padding: 16px 18px;
  background: var(--sticky); border-left: 4px solid var(--hi);
  color: var(--ink); font: 15px/1.7 var(--sans);
  box-shadow: 2px 3px 0 rgba(34, 34, 34, 0.06);
}
.ex ol { margin: 8px 0 0; padding-left: 1.2rem; }
.ex li { margin: 6px 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; }
.path { list-style: none; padding: 0; margin: 2rem 0; }
.path li {
  border-top: 1px solid var(--line); padding: 14px 0;
  display: grid; grid-template-columns: 3.2rem 1fr; gap: 12px;
}
.path time { color: var(--hi-deep); font: 700 12px/1.6 var(--mono); }
.path a { color: var(--ink); font-weight: 700; text-decoration: none; }
.path a:hover { color: var(--hi-deep); }
.path small { display: block; color: var(--muted); font-weight: 400; margin-top: 4px; }