:root {
  --paper: #f4efe4;
  --paper-deep: #e8dfcf;
  --ink: #272923;
  --muted: #73756c;
  --rule: rgba(61, 63, 56, 0.18);
  --cinnabar: #a94735;
  --cinnabar-deep: #7f3327;
  --bluegray: #66818a;
  --other: #8b8276;
  --gold: #b28a43;
  --panel: rgba(250, 247, 239, 0.96);
  --shadow: 0 20px 60px rgba(49, 45, 36, 0.12);
  color-scheme: light;
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; background: var(--paper); color: var(--ink); }

body {
  background-image:
    radial-gradient(circle at 12% 10%, rgba(169, 71, 53, 0.055), transparent 24rem),
    linear-gradient(rgba(59, 61, 54, 0.018) 1px, transparent 1px);
  background-size: auto, 100% 28px;
}

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

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 3rem;
  padding: 2rem clamp(1.25rem, 4vw, 4.5rem) 1.5rem;
  border-bottom: 1px solid var(--rule);
}

.eyebrow, .section-kicker {
  margin: 0 0 0.45rem;
  color: var(--cinnabar);
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.18em;
}

.title-row { display: flex; align-items: baseline; gap: 0.75rem; }
.title-row h1 {
  margin: 0;
  font-family: "Songti SC", "STSong", serif;
  font-size: clamp(2.3rem, 4vw, 4rem);
  font-weight: 600;
  letter-spacing: 0.08em;
}
.title-row p { margin: 0; color: var(--muted); font-family: "Songti SC", serif; }
.seal {
  align-self: center;
  display: inline-grid;
  place-items: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 2px;
  background: var(--cinnabar);
  color: var(--paper);
  font-family: "Songti SC", serif;
}

.summary { display: grid; grid-template-columns: repeat(4, minmax(5rem, 1fr)); gap: 1.7rem; }
.summary div { text-align: right; }
.summary strong { display: block; font: 600 1.45rem/1 "Songti SC", serif; }
.summary span { color: var(--muted); font-size: 0.7rem; letter-spacing: 0.08em; }

main { padding: 0 clamp(1rem, 3vw, 3.5rem) 1.5rem; }

.controls {
  display: flex;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 1rem 1.6rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--rule);
}
.control-group, .search-group, .zoom-group { display: flex; align-items: center; gap: 0.5rem; }
.control-label, .search-group label, .zoom-group label {
  color: var(--muted);
  font-size: 0.72rem;
  white-space: nowrap;
}
.segmented { display: flex; padding: 3px; border: 1px solid var(--rule); border-radius: 999px; }
.segmented button, .quiet-button, .search-group button {
  border: 0;
  background: transparent;
  border-radius: 999px;
  padding: 0.42rem 0.8rem;
  cursor: pointer;
  font-size: 0.76rem;
}
.segmented button.active { background: var(--ink); color: var(--paper); }
.search-group input {
  width: 10.5rem;
  padding: 0.48rem 0.65rem;
  border: 0;
  border-bottom: 1px solid var(--ink);
  background: rgba(255,255,255,0.22);
  outline: none;
}
.search-group input:focus { border-bottom-color: var(--cinnabar); box-shadow: 0 2px 0 var(--cinnabar); }
.search-group button, .quiet-button { border: 1px solid var(--rule); background: rgba(255,255,255,0.28); }
.search-group button:hover, .quiet-button:hover { border-color: var(--cinnabar); color: var(--cinnabar-deep); }
.zoom-group { margin-left: auto; flex-wrap: wrap; justify-content: flex-end; }
.zoom-control { display: inline-flex; align-items: center; gap: 0.5rem; }
.zoom-group input { width: 5.4rem; accent-color: var(--cinnabar); }
.zoom-group output { color: var(--ink); font-variant-numeric: tabular-nums; }

.legend-strip {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.7rem 1.2rem;
  min-height: 2.7rem;
  color: var(--muted);
  font-size: 0.68rem;
}
.legend-strip span { display: inline-flex; align-items: center; gap: 0.35rem; }
.swatch, .outline { display: inline-block; width: 0.58rem; height: 0.58rem; border-radius: 1px; }
.swatch.precise { background: var(--cinnabar); }
.swatch.coarse { background: var(--bluegray); }
.swatch.other { background: var(--other); }
.outline.precise-endpoint { border: 2px solid var(--cinnabar); }
.outline.ambiguous { border: 2px solid var(--gold); }
.outline.unmatched { border: 1px dashed var(--other); }
.life-column-sample, .single-year-sample { position: relative; display: inline-block; width: 0.72rem; height: 1.12rem; }
.life-column-sample::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0.1rem;
  bottom: 0.1rem;
  width: 3px;
  border-radius: 999px;
  background: rgba(39,41,35,.44);
  transform: translateX(-50%);
}
.life-column-sample::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 0.08rem;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(39,41,35,.58);
  box-shadow: 0 0.78rem 0 rgba(39,41,35,.58);
  transform: translateX(-50%);
}
.single-year-sample::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 0.18rem;
  height: 0.72rem;
  border-left: 2px dashed rgba(39,41,35,.48);
  transform: translateX(-50%);
}
.single-year-sample::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 0.08rem;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: rgba(39,41,35,.58);
  transform: translateX(-50%);
}
.life-reference-note { color: var(--ink); opacity: 0.72; }
.mode-note { margin-left: auto; color: var(--ink); }

.timeline-card {
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: 3px;
  background: rgba(250, 247, 239, 0.68);
  box-shadow: var(--shadow);
}
.timeline-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  padding: 0.9rem 1.1rem 0.75rem;
  border-bottom: 1px solid var(--rule);
}
.timeline-heading > div { flex: 1 1 auto; min-width: 0; }
.timeline-heading h2 { margin: 0; font: 600 1.25rem "Songti SC", serif; }
.tune-focus-status { margin: 0.28rem 0 0; color: var(--cinnabar-deep); font: 600 0.76rem "Songti SC", serif; }
.timeline-heading .timeline-method-note { max-width: 58rem; margin: 0.3rem 0 0; color: var(--muted); font-size: 0.68rem; line-height: 1.55; }
.timeline-method-note span { display: block; }
.timeline-method-note span + span { margin-top: 0.12rem; }
.timeline-heading > p:last-child { flex: 0 0 auto; margin: 0; color: var(--muted); font-size: 0.72rem; text-align: right; white-space: nowrap; }

.timeline-viewport { position: relative; height: min(68vh, 720px); min-height: 470px; overflow: hidden; outline: none; }
.timeline-viewport:focus-visible { box-shadow: inset 0 0 0 2px var(--cinnabar); }
.timeline-scroller { position: absolute; inset: 0; overflow: auto; z-index: 1; }
#timelineSpacer { width: 100%; height: 100%; pointer-events: none; }
#timelineCanvas { position: absolute; inset: 0; z-index: 2; width: 100%; height: 100%; pointer-events: none; }

.loading-state {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: grid;
  place-content: center;
  justify-items: center;
  background: rgba(244, 239, 228, 0.92);
  color: var(--muted);
}
.loading-state[hidden] { display: none; }
.loading-mark { display: grid; place-items: center; width: 3rem; height: 3rem; background: var(--cinnabar); color: white; font: 1.5rem "Songti SC", serif; animation: breathe 1.4s ease-in-out infinite; }
@keyframes breathe { 50% { opacity: 0.62; transform: scale(0.94); } }

.tooltip {
  position: absolute;
  z-index: 5;
  max-width: 280px;
  padding: 0.62rem 0.72rem;
  border: 1px solid rgba(39,41,35,0.22);
  background: rgba(255, 252, 245, 0.97);
  box-shadow: 0 10px 30px rgba(39,41,35,0.14);
  pointer-events: none;
  font-size: 0.72rem;
  line-height: 1.55;
}
.tooltip strong { display: block; font-family: "Songti SC", serif; font-size: 0.9rem; }

.detail-panel {
  position: fixed;
  z-index: 20;
  top: 0;
  right: 0;
  width: min(430px, 92vw);
  height: 100vh;
  padding: 2rem 1.4rem 1.5rem;
  overflow: auto;
  border-left: 1px solid var(--rule);
  background: var(--panel);
  box-shadow: -20px 0 60px rgba(39,41,35,0.12);
  backdrop-filter: blur(16px);
}
.detail-panel[hidden] { display: none; }
.panel-close { position: absolute; top: 0.8rem; right: 0.9rem; border: 0; background: transparent; font-size: 1.7rem; cursor: pointer; }
.detail-panel h2 { margin: 0.3rem 2rem 0.2rem 0; font: 600 1.8rem "Songti SC", serif; }
.detail-panel h3 { margin: 1.4rem 0 0.5rem; font: 600 1rem "Songti SC", serif; }
.detail-panel .meta { margin: 0; color: var(--muted); font-size: 0.75rem; }
.detail-panel .description { line-height: 1.78; font-family: "Songti SC", serif; }
.badge { display: inline-block; margin: 0.35rem 0.3rem 0 0; padding: 0.18rem 0.42rem; border: 1px solid var(--rule); border-radius: 999px; color: var(--muted); font-size: 0.66rem; }
.work-list { display: grid; gap: 0.4rem; margin: 0; padding: 0; list-style: none; }
.work-item { width: 100%; display: grid; grid-template-columns: 3.8rem 1fr; gap: 0.6rem; text-align: left; padding: 0.55rem 0; border: 0; border-bottom: 1px solid var(--rule); background: transparent; cursor: pointer; }
.work-item:hover { color: var(--cinnabar-deep); }
.work-item time { color: var(--muted); font-variant-numeric: tabular-nums; }
.panel-action { margin-top: 0.8rem; border: 1px solid var(--rule); background: transparent; padding: 0.5rem 0.7rem; cursor: pointer; }
.work-author { margin: 0.35rem 0 0.7rem; }
.work-author button {
  padding: 0;
  border: 0;
  border-bottom: 1px solid var(--rule);
  background: transparent;
  color: var(--cinnabar-deep);
  cursor: pointer;
  font: 1rem "Songti SC", serif;
}
.work-time-summary { display: flex; align-items: center; flex-wrap: wrap; gap: 0.45rem; color: var(--muted); font-size: 0.74rem; }
.precision-chip { padding: 0.16rem 0.42rem; border-radius: 999px; color: white; }
.precision-chip.precise { background: var(--cinnabar); }
.precision-chip.coarse { background: var(--bluegray); }
.precision-chip.other { background: var(--other); }
.time-evidence {
  display: grid;
  gap: 0.25rem;
  margin: 0.85rem 0 0;
  padding: 0.7rem 0.8rem;
  border-left: 2px solid var(--paper-deep);
  background: rgba(232,223,207,.34);
  color: var(--muted);
  font-size: 0.7rem;
  line-height: 1.55;
}
.time-evidence b { color: var(--ink); }
.review-flag { color: var(--cinnabar-deep); }
.work-section { margin-top: 1.35rem; padding-top: 0.25rem; }
.work-section + .work-section { padding-top: 1.25rem; border-top: 1px solid var(--rule); }
.work-body {
  padding: 0.75rem 0.25rem 0.8rem 0.55rem;
  border-left: 1px solid rgba(169,71,53,.34);
  font-family: "Songti SC", "STSong", serif;
  font-size: 1.08rem;
  line-height: 1.9;
  letter-spacing: 0.025em;
}
.work-body p { margin: 0; }
.tune-heading { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.tune-heading div { display: grid; gap: 0.18rem; }
.tune-heading strong { font: 600 1.15rem "Songti SC", serif; }
.tune-heading span { color: var(--muted); font-size: 0.68rem; }
.tune-aliases { color: var(--muted); font-size: 0.73rem; line-height: 1.65; }
.tune-aliases b { margin-right: 0.35rem; color: var(--ink); }
.ambiguity-callout { padding: 0.7rem 0.8rem; border-left: 2px solid var(--gold); background: rgba(178,138,67,.09); color: var(--muted); font-size: 0.75rem; line-height: 1.65; }
.ambiguity-callout strong { color: var(--ink); }
.candidate-list { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.missing-content { color: var(--muted); font-family: "Songti SC", serif; }
.tune-chronology-panel {
  margin-top: 1rem;
  padding: 0.25rem 0 0.9rem;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.tune-chronology-panel h3 { margin-top: 1rem; }
.endpoint-work { cursor: default; }
.endpoint-work-heading { display: flex; flex-wrap: wrap; align-items: baseline; }
.endpoint-link { padding: 0; border: 0; background: transparent; color: inherit; cursor: pointer; font: inherit; text-align: left; }
.endpoint-link:hover { color: var(--cinnabar-deep); }
.endpoint-work small { display: block; margin-top: 0.2rem; color: var(--muted); font-size: 0.65rem; line-height: 1.45; }
.precise-chronology { margin: 0.25rem 0 0.65rem; color: var(--muted); font: 0.72rem/1.55 "PingFang SC", sans-serif; }
.precise-evidence { margin: 0.85rem 0 1rem; padding-left: 0.75rem; border-left: 2px solid rgba(169,71,53,.28); }
.precise-evidence-group + .precise-evidence-group { margin-top: 0.9rem; }
.precise-evidence-group h4 { margin: 0 0 0.3rem; color: var(--cinnabar-deep); font: 600 0.82rem/1.5 "Songti SC", serif; }
.precise-match-note + .precise-match-note { margin-top: 0.35rem; }
.chronology-range { margin: 1rem 0 0; color: var(--ink); font: 0.82rem/1.65 "Songti SC", serif; }
.tune-counts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.45rem; margin: 0.8rem 0 0; }
.tune-counts div { padding: 0.5rem; background: rgba(232,223,207,.3); }
.tune-counts dt { color: var(--muted); font-size: 0.63rem; line-height: 1.4; }
.tune-counts dd { margin: 0.2rem 0 0; font: 600 1rem "Songti SC", serif; }

.error-state { color: var(--cinnabar-deep); }

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem clamp(1rem, 3vw, 3.5rem) 1.5rem;
  color: var(--muted);
  font-size: 0.66rem;
}

@media (max-width: 900px) {
  .masthead { align-items: flex-start; flex-direction: column; gap: 1rem; }
  .summary { width: 100%; }
  .summary div { text-align: left; }
  .zoom-group { margin-left: 0; width: 100%; justify-content: flex-start; }
  .timeline-heading { align-items: flex-start; flex-direction: column; gap: 0.35rem; }
  .timeline-heading > div { width: 100%; }
  .timeline-heading > p:last-child { text-align: left; white-space: normal; }
}

@media (max-width: 600px) {
  .title-row { flex-wrap: wrap; }
  .controls { align-items: stretch; }
  .search-group { width: 100%; }
  .search-group input { flex: 1; width: auto; }
  .zoom-group { flex-wrap: wrap; }
  .mode-note { width: 100%; margin-left: 0; }
  footer { flex-direction: column; }
}