:root {
  color-scheme: light dark;
  --bg: #f6f3ee;
  --fg: #221f1b;
  --muted: #6f675e;
  --line: #e4ddd3;
  --card: #fffdf9;
  --soft: #f3efe8;
  --danger: #6f675e;
  --shadow: 0 1px 0 rgba(34, 31, 27, 0.04);
  font-size: 17px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161412;
    --fg: #f3efe8;
    --muted: #b7aea3;
    --line: #3a342c;
    --card: #221f1b;
    --soft: #1c1916;
    --shadow: none;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
  line-height: 1.65;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

button, input, textarea { font: inherit; color: inherit; }

button {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
  cursor: pointer;
}

button:disabled { opacity: 0.45; cursor: default; }

a { color: inherit; text-underline-offset: 0.18em; }

:focus-visible {
  outline: 2px solid var(--fg);
  outline-offset: 2px;
}

.noscript { padding: 2rem 1rem; text-align: center; }

.wrap {
  width: min(40rem, 100%);
  margin: 0 auto;
  padding: 1rem 1rem 4.5rem;
}

.wrap.wide { width: min(52rem, 100%); }

.top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.brand {
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.04em;
}

.top-nav { display: flex; gap: 0.9rem; align-items: center; }

.top-nav a, .top-nav button {
  background: none;
  border: 0;
  padding: 0;
  color: var(--muted);
  text-decoration: none;
}

.top-nav button { cursor: pointer; }

h1, h2, h3 { font-weight: 600; letter-spacing: 0.01em; }

h1 { font-size: 1.55rem; line-height: 1.3; margin: 0 0 0.4rem; }

h2 { font-size: 1.05rem; margin: 1.6rem 0 0.6rem; color: var(--muted); font-weight: 500; }

.muted { color: var(--muted); }

.sub { color: var(--muted); margin: 0.15rem 0 0.8rem; }

.login-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.login-card { width: min(100%, 22rem); }

.login-card h1 { margin-bottom: 0.35rem; }

label { display: block; margin: 0.9rem 0 0.25rem; font-size: 0.92rem; }

input[type="text"], input[type="password"], textarea {
  width: 100%;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  field-sizing: content;
}

textarea { line-height: 1.65; resize: vertical; background: var(--soft); }

.primary, button.primary, a.primary {
  display: block;
  width: 100%;
  text-align: center;
  background: var(--fg);
  color: var(--bg);
  border: 1px solid var(--fg);
  border-radius: 999px;
  padding: 0.8rem 1rem;
  margin-top: 1.1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
}

.form-error { color: var(--fg); min-height: 1.4em; margin: 0.8rem 0 0; }

.stats { margin: 0.4rem 0 1.2rem; }

.stat-num { font-size: 1.8rem; letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }

.progress-block { margin: 0.7rem 0 0.2rem; }

.progress-label, .section-label {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.88rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
}

progress {
  appearance: none;
  width: 100%;
  height: 4px;
  border: 0;
  border-radius: 999px;
  background: var(--line);
  color: var(--fg);
  display: block;
}

progress::-webkit-progress-bar { background: var(--line); border-radius: 999px; }

progress::-webkit-progress-value { background: var(--fg); border-radius: 999px; }

progress::-moz-progress-bar { background: var(--fg); border-radius: 999px; }

.scope { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 1rem 0; }

.scope button.on, button[aria-pressed="true"].chip {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}

.tools { display: flex; flex-wrap: wrap; gap: 0.8rem 1rem; margin: 0.6rem 0 1rem; }

.tools a { color: var(--muted); }

.parts { display: grid; gap: 0.75rem; }

.part-card, .section-link, .result {
  display: block;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.95rem 1rem;
  text-decoration: none;
  box-shadow: var(--shadow);
}

.part-card h3, .section-link h3 { margin: 0; font-size: 1.08rem; }

.intro {
  font-family: "Songti SC", "Noto Serif CJK SC", serif;
  font-size: 1.05rem;
  line-height: 1.75;
  margin: 0.4rem 0 1.2rem;
}

.section-list { display: grid; gap: 0.65rem; }

.tag {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.05rem 0.45rem;
  margin-left: 0.35rem;
}

.sticky-bar {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--bg);
  padding: 0.45rem 0 0.35rem;
}

.crumb { margin: 0.2rem 0; color: var(--muted); }

.crumb a { color: inherit; }

.gentle {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0.4rem 0 0.8rem;
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1rem;
  align-items: center;
  margin: 0.6rem 0 0.8rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.toolbar label { margin: 0; display: flex; gap: 0.35rem; align-items: center; }

.filter-note { color: var(--muted); font-size: 0.88rem; margin: 0.2rem 0 0.8rem; min-height: 1.2em; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.95rem 1rem 0.85rem;
  margin: 0 0 0.9rem;
  scroll-margin-top: 1.6rem;
  box-shadow: var(--shadow);
}

.card.is-current { box-shadow: inset 3px 0 0 var(--fg); }

.card-h { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; margin-bottom: 0.45rem; }

.qid { font-variant-numeric: tabular-nums; font-size: 0.8rem; color: var(--muted); }

.depth {
  font-size: 0.75rem;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.02rem 0.45rem;
}

.mark { font-size: 0.75rem; color: var(--muted); }

.lead {
  font-family: "Songti SC", "Noto Serif CJK SC", serif;
  color: var(--muted);
  border-left: 2px solid var(--line);
  padding-left: 0.75rem;
  margin: 0.2rem 0 0.75rem;
}

.q {
  font-size: 1.18rem;
  font-weight: 600;
  line-height: 1.45;
  margin: 0 0 0.55rem;
}

.hint { color: var(--muted); font-size: 0.86rem; margin: 0 0 0.8rem; }

.scale {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.35rem;
  justify-content: space-between;
}

.dot-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  flex: 1 1 2.8rem;
  max-width: 5.5rem;
}

.dot {
  width: 2.35rem;
  height: 2.35rem;
  border-radius: 50%;
  padding: 0;
}

.dot[aria-checked="true"] { background: var(--fg); color: var(--bg); border-color: var(--fg); }

.dot-label {
  font-size: 0.68rem;
  line-height: 1.25;
  text-align: center;
  color: var(--muted);
  min-height: 1.6em;
}

.ab { display: grid; gap: 0.55rem; }

.ab-side {
  margin: 0;
  font-family: "Songti SC", "Noto Serif CJK SC", serif;
}

.ab-side::before {
  display: inline-block;
  margin-right: 0.5em;
  padding: 0 0.42em;
  border: 1px solid var(--line);
  border-radius: 6px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  font-size: 0.72rem;
  line-height: 1.5;
  color: var(--muted);
  vertical-align: 0.12em;
}

.ab-a::before { content: "A"; }

.ab-b::before { content: "B"; }

.ab-levels { display: flex; flex-direction: column; gap: 0.35rem; }

.ab-levels button { text-align: left; border-radius: 10px; }

.ab-levels button[aria-checked="true"] { background: var(--fg); color: var(--bg); border-color: var(--fg); }

.choice {
  display: flex;
  width: 100%;
  text-align: left;
  border-radius: 0;
  border-left: 0;
  border-right: 0;
  border-top: 0;
  padding: 0.65rem 0.15rem;
  background: transparent;
}

.choice[aria-checked="true"] { background: var(--fg); color: var(--bg); border-radius: 8px; padding-left: 0.55rem; padding-right: 0.55rem; }

.choice-list { border-top: 1px solid var(--line); }

.cap { color: var(--muted); font-size: 0.86rem; margin: 0 0 0.3rem; }

.other-text, .num { margin-top: 0.55rem; }

.number { display: flex; align-items: center; gap: 0.6rem; }

.number input { max-width: 9rem; }

.unit { color: var(--muted); }

.rank-order { color: var(--muted); font-size: 0.9rem; min-height: 1.4em; }

.order {
  display: inline-block;
  min-width: 1.2rem;
  margin-right: 0.35rem;
  font-variant-numeric: tabular-nums;
}

.note { margin-top: 0.7rem; }

.actions { display: flex; flex-wrap: wrap; gap: 0.3rem; margin-top: 0.75rem; }

.actions button {
  font-size: 0.8rem;
  line-height: 1.4;
  padding: 0.18rem 0.6rem;
  color: var(--muted);
}

.actions button[aria-pressed="true"] { background: var(--fg); color: var(--bg); border-color: var(--fg); }

.stale .actions button { color: var(--fg); }

.choice[aria-pressed="true"] { font-weight: 600; }

.stale {
  margin-top: 0.85rem;
  padding: 0.7rem 0.8rem;
  border: 1px dashed var(--muted);
  border-radius: 10px;
  font-size: 0.9rem;
}

.stale p { margin: 0; }

.stale-text {
  margin-top: 0.45rem !important;
  padding-left: 0.7rem;
  border-left: 2px solid var(--line);
  color: var(--muted);
  white-space: pre-wrap;
  max-height: 12rem;
  overflow: auto;
}

.stale .actions { margin-top: 0.6rem; }

.local-note {
  margin: 0.9rem 0 0;
  padding: 0.7rem 0.8rem;
  border: 1px dashed var(--muted);
  border-radius: 10px;
  font-size: 0.9rem;
}

.local-note p { margin: 0; }

.local-links { display: flex; flex-wrap: wrap; gap: 0.3rem 0.8rem; margin-top: 0.35rem !important; }

.vol-intro { color: var(--muted); font-size: 0.92rem; margin: 0 0 0.8rem; }

.save-state { margin-left: auto; font-size: 0.75rem; color: var(--muted); text-align: right; }

.count { color: var(--muted); font-size: 0.8rem; text-align: right; margin: 0.2rem 0 0; }

.pager {
  display: flex;
  justify-content: space-between;
  gap: 0.8rem;
  margin-top: 1.2rem;
}

.pager a, .pager span { color: var(--muted); }

.keys { color: var(--muted); font-size: 0.8rem; margin-top: 1.4rem; }

.search-form { display: flex; gap: 0.5rem; }

.search-form input { flex: 1; }

.search-form button { border-radius: 10px; }

.results { display: grid; gap: 0.55rem; margin-top: 0.9rem; }

.result { display: grid; gap: 0.2rem; }

@media (min-width: 720px) {
  .ab {
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: center;
    gap: 0.8rem;
  }
  .ab-a { text-align: right; }
  .ab-levels { min-width: 9.5rem; }
  .parts { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 900px) {
  .wrap { padding-top: 1.6rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}