:root {
  --ink: #1a1d23;
  --muted: #5c6570;
  --line: #d5dbe3;
  --paper: #f4f7fb;
  --sheet: #fbfcfe;
  --spine: #b42318;
  --seal: #9f1d1d;
  --ok: #0f6b45;
  --ok-bg: #e5f5ec;
  --bad: #9f1d1d;
  --bad-bg: #fdecec;
  --focus: #1d4e89;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.55;
}
.sheet {
  max-width: 44rem;
  margin: 0 auto;
  min-height: 100vh;
  background: var(--sheet);
  border-left: 10px solid var(--spine);
  padding: 1.6rem 1.4rem 3rem;
}
h1 {
  font-family: var(--serif);
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  margin: 0 0 0.35rem;
}
.lead { margin: 0; color: var(--muted); max-width: 36em; }
.top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.6rem 1rem;
  align-items: flex-end;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--line);
}
.tally { margin: 0; color: var(--muted); font-size: 0.92rem; }

.modes { display: grid; gap: 0.7rem; margin-top: 1.2rem; }
.mode {
  text-align: left;
  width: 100%;
  background: transparent;
  border: 1px solid var(--line);
  padding: 0.9rem 1rem;
  cursor: pointer;
  font: inherit;
  color: inherit;
}
.mode:hover { border-color: var(--ink); }
.mode strong { font-family: var(--serif); font-size: 1.25rem; display: block; }
.mode span { color: var(--muted); font-size: 0.95rem; }
.mode:focus-visible, button:focus-visible, select:focus-visible, input:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  margin: 1rem 0;
}
.bar button, .actions button, .check {
  font: inherit;
  background: var(--ink);
  color: white;
  border: 0;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
}
.bar button.ghost, .actions button.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--line);
}
select, .blank input {
  font: inherit;
  border: 1px solid var(--line);
  background: white;
  padding: 0.35rem 0.5rem;
  color: var(--ink);
}
.progress { margin-left: auto; color: var(--muted); font-size: 0.92rem; }

.stem {
  font-family: var(--serif);
  font-size: 1.2rem;
  line-height: 1.7;
  margin: 0.4rem 0 1rem;
}
.blank input {
  width: 9.5em;
  border-bottom: 2px solid var(--ink);
  border-top: 0;
  border-left: 0;
  border-right: 0;
  border-radius: 0;
  background: transparent;
  font-family: var(--serif);
  font-size: 1.15rem;
  padding: 0 0.2rem 0.1rem;
  margin: 0 0.15rem;
}
.blank input.ok { color: var(--ok); border-bottom-color: var(--ok); }
.blank input.bad { color: var(--bad); border-bottom-color: var(--bad); }

.options { display: grid; gap: 0.45rem; margin-bottom: 1rem; }
.opt {
  display: flex;
  gap: 0.55rem;
  align-items: flex-start;
  border: 1px solid var(--line);
  padding: 0.55rem 0.7rem;
  cursor: pointer;
  background: white;
}
.opt input { margin-top: 0.35rem; }
.opt.picked { border-color: var(--ink); }
.opt.right { background: var(--ok-bg); border-color: var(--ok); }
.opt.wrong { background: var(--bad-bg); border-color: var(--bad); }

.verdict {
  min-height: 1.6rem;
  margin: 0.2rem 0 0.8rem;
  font-family: var(--serif);
}
.verdict.ok { color: var(--ok); }
.verdict.bad { color: var(--bad); }
.standard {
  background: #f3f6f2;
  border-left: 3px solid var(--ok);
  padding: 0.75rem 0.9rem;
  white-space: pre-wrap;
  font-family: var(--serif);
  line-height: 1.7;
}
.actions { display: flex; gap: 0.5rem; margin-top: 0.6rem; }
.seal {
  display: inline-block;
  margin-left: 0.4rem;
  border: 2px solid var(--seal);
  color: var(--seal);
  font-family: var(--serif);
  padding: 0 0.25rem;
  transform: rotate(-8deg);
  line-height: 1.3;
}
@media (max-width: 640px) {
  .sheet { border-left-width: 6px; padding: 1.1rem 0.9rem 2rem; }
  .top { flex-direction: column; align-items: flex-start; }
  .tally { text-align: left; }
  .progress { margin-left: 0; }
}
@media (prefers-reduced-motion: reduce) {
  .seal { transform: none; }
}