:root {
  --bg: #0B1026;
  --bg-2: #111735;
  --panel: rgba(20, 27, 58, 0.72);
  --panel-border: rgba(143, 163, 200, 0.22);
  --gold: #F5C453;
  --gold-soft: rgba(245, 196, 83, 0.14);
  --silver: #8FA3C8;
  --text: #E8ECF7;
  --text-dim: #9AA6C4;
  --serif: "Songti SC", "Noto Serif SC", "STSong", serif;
  --sans: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", Menlo, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(58, 111, 216, 0.16), transparent 60%),
    radial-gradient(900px 500px at 10% 110%, rgba(245, 196, 83, 0.08), transparent 60%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.65;
  min-height: 100vh;
}

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(11, 16, 38, 0.85);
  border-bottom: 1px solid var(--panel-border);
}
.header-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center; gap: 20px;
  padding: 14px 22px; flex-wrap: wrap;
}
.brand { display: flex; align-items: baseline; gap: 10px; text-decoration: none; }
.brand .logo { font-family: var(--serif); font-size: 22px; color: var(--gold); letter-spacing: 2px; }
.brand .sub { font-size: 12px; color: var(--text-dim); }
.nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.nav a {
  color: var(--silver); text-decoration: none; font-size: 14px;
  padding: 6px 14px; border-radius: 20px; transition: all .2s;
}
.nav a:hover { color: var(--gold); background: var(--gold-soft); }
.nav a.active { color: #0B1026; background: var(--gold); font-weight: 600; }

main { max-width: 1200px; margin: 0 auto; padding: 26px 22px 80px; }

.page-title { font-family: var(--serif); font-size: 30px; letter-spacing: 2px; color: var(--gold); }
.page-sub { color: var(--text-dim); font-size: 14px; margin-top: 6px; }

/* ---------- filters ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 20px 0; }
.filters .group-label { color: var(--text-dim); font-size: 13px; margin-right: 4px; align-self: center; }
.chip {
  cursor: pointer; user-select: none;
  border: 1px solid var(--panel-border); border-radius: 18px;
  padding: 4px 14px; font-size: 13px; color: var(--silver);
  background: transparent; transition: all .15s; font-family: var(--sans);
}
.chip:hover { border-color: var(--gold); color: var(--gold); }
.chip.on { background: var(--gold); color: #0B1026; border-color: var(--gold); font-weight: 600; }
.search-box {
  background: var(--panel); border: 1px solid var(--panel-border); border-radius: 18px;
  color: var(--text); padding: 6px 16px; font-size: 14px; width: 220px; outline: none;
}
.search-box:focus { border-color: var(--gold); }

/* ---------- river timeline (single continuous axis) ---------- */
.river-toolbar { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; margin: 4px 0 12px; }
.river-tip { color: var(--text-dim); font-size: 12px; margin-left: 10px; }
.river-scroll {
  overflow-x: auto; overflow-y: hidden; border-radius: 16px;
  border: 1px solid var(--panel-border); background: rgba(11,16,38,0.55);
  cursor: grab; overscroll-behavior-x: contain;
}
.river-scroll:active { cursor: grabbing; }
.river-core { position: relative; min-width: 100%; user-select: none; }

.era-band-row { display: flex; height: 58px; border-bottom: 1px solid rgba(143,163,200,0.18); }
.era-band {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  border-right: 1px dashed rgba(143,163,200,0.35);
  background: rgba(255,255,255,0.02);
}
.era-band:nth-child(even) { background: rgba(255,255,255,0.045); }
.era-band-name { font-family: var(--serif); font-size: 15px; color: var(--gold); letter-spacing: 1px; }
.era-band-range { font-family: var(--mono); font-size: 11px; color: var(--text-dim); margin-top: 2px; }
.era-band-desc { font-size: 11px; color: var(--text-dim); }

.era-guides { position: absolute; top: 58px; bottom: 30px; pointer-events: none; z-index: 0; }
.era-guide { position: absolute; top: 0; bottom: 0; width: 0; border-left: 2px solid rgba(245,196,83,0.35); }

.lane-layer { position: relative; padding-top: 8px; }
.lane-none { color: var(--text-dim); padding: 30px 0; text-align: center; }
/* ---------- 单轴泳道 ---------- */
.lane-layer { position: relative; }
.lane-none { color: var(--text-dim); padding: 30px 0; text-align: center; }
.river-lane { position: relative; display: flex; align-items: center; height: 44px; margin: 2px 0; }
.river-lane-label {
  position: sticky; left: 0; z-index: 6; flex: 0 0 auto;
  width: 92px; font-size: 13px; text-align: right; padding-right: 14px;
  background: linear-gradient(90deg, #0A0F24 72%, transparent);
}
.river-lane-track { position: relative; flex: 1; height: 100%; }
.river-lane-track .dot { top: 50%; transform: translate(-50%, -50%); }
.river-lane-track .dot:hover { transform: translate(-50%, -50%) scale(1.5); }

.event-tip {
  position: fixed; z-index: 300; display: none; pointer-events: none;
  font-family: var(--sans); font-size: 12.5px; color: var(--text);
  background: rgba(11, 16, 38, 0.96); border: 1px solid var(--gold);
  border-radius: 10px; padding: 5px 12px; white-space: nowrap;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}
.event-tip.show { display: block; }

.river-axis { position: relative; height: 30px; border-top: 1px solid rgba(143,163,200,0.2); margin-left: 92px; }
.axis-tick {
  position: absolute; top: 4px; transform: translateX(-50%);
  font-family: var(--mono); font-size: 11px; color: var(--silver);
  border-left: 1px solid rgba(143,163,200,0.35); padding-left: 3px; white-space: nowrap;
}

@media (max-width: 760px) {
  .river-lane-label { width: 62px; padding-right: 8px; font-size: 12px; }
  .river-axis { margin-left: 70px; }
  .era-band-name { font-size: 13px; }
  .river-toolbar .chip { white-space: nowrap; }
  .river-tip { flex-basis: 100%; margin-left: 0; }
}
.concept-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; margin-top: 14px; }
.concept-card .name { font-size: 17px; }

/* ---------- era sections (timeline) ---------- */
.era-block { margin-bottom: 44px; }
.era-head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; padding: 10px 4px; }
.era-name { font-family: var(--serif); font-size: 22px; color: var(--gold); letter-spacing: 1px; }
.era-range { font-family: var(--mono); color: var(--text-dim); font-size: 13px; }
.era-desc { color: var(--text-dim); font-size: 13px; width: 100%; }
.lane {
  display: grid; grid-template-columns: 96px 1fr; gap: 10px;
  margin: 10px 0; align-items: center;
}
.lane-label { font-size: 13px; color: var(--silver); text-align: right; }
.lane-track {
  position: relative; height: 44px;
  background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.05));
  border-radius: 10px; border: 1px solid rgba(143,163,200,0.1);
}
.dot {
  position: absolute; top: 50%; transform: translate(-50%, -50%);
  width: 14px; height: 14px; border-radius: 50%;
  border: 2px solid; cursor: pointer; transition: transform .15s, box-shadow .15s;
}
.dot:hover { transform: translate(-50%, -50%) scale(1.5); z-index: 5; box-shadow: 0 0 12px currentColor; }
.axis {
  display: flex; justify-content: space-between;
  font-family: var(--mono); font-size: 11px; color: var(--text-dim);
  padding: 2px 6px 10px 106px;
}

/* ---------- people cards ---------- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; margin-top: 20px; }
.person-card {
  background: var(--panel); border: 1px solid var(--panel-border); border-radius: 14px;
  padding: 16px; cursor: pointer; transition: transform .15s, border-color .15s, box-shadow .15s;
}
.person-card:hover { transform: translateY(-3px); border-color: var(--gold); box-shadow: 0 10px 28px rgba(0,0,0,.35); }
.person-card .name { font-family: var(--serif); font-size: 19px; color: var(--text); }
.person-card .en { font-size: 12px; color: var(--text-dim); font-family: var(--mono); }
.person-card .years { font-family: var(--mono); font-size: 13px; color: var(--gold); margin: 4px 0 8px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: 11px; border-radius: 10px; padding: 1px 9px;
  border: 1px solid var(--panel-border); color: var(--silver);
}
.tag.civ { color: var(--civ-color, var(--silver)); border-color: var(--civ-color, var(--silver)); }
.stars { color: var(--gold); font-size: 12px; letter-spacing: 1px; margin-top: 8px; }

/* ---------- lineage ---------- */
.lineage-block { margin: 28px 0; background: var(--panel); border: 1px solid var(--panel-border); border-radius: 14px; padding: 18px; }
.lineage-title { font-family: var(--serif); font-size: 18px; color: var(--gold); }
.lineage-desc { color: var(--text-dim); font-size: 13px; margin: 4px 0 14px; }
.chain { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.chain-node {
  background: rgba(255,255,255,0.05); border: 1px solid var(--panel-border);
  border-radius: 10px; padding: 5px 12px; font-size: 14px; cursor: pointer;
  transition: all .15s; white-space: nowrap;
}
.chain-node:hover { border-color: var(--gold); color: var(--gold); }
.chain-arrow { color: var(--text-dim); font-size: 14px; }

/* ---------- 课外读物门类 ---------- */
.extra-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; grid-auto-flow: row; }
.extra-card {
  background: var(--panel); border: 1px solid var(--panel-border); border-radius: 12px;
  padding: 14px 16px;
}
.extra-card:hover { border-color: var(--gold); }
.extra-card .extra-head { display: flex; justify-content: space-between; gap: 10px; align-items: baseline; }
.extra-card .extra-head b { color: var(--text); font-size: 15px; }
.extra-meta { font-family: var(--mono); font-size: 11px; color: var(--gold); white-space: nowrap; }
.extra-card summary { cursor: pointer; color: var(--silver); font-size: 13px; margin-top: 8px; }
.extra-kids { margin: 8px 0 0 18px; color: var(--text-dim); font-size: 12.5px; }
.extra-kids li { margin: 3px 0; }
.extra-path { font-family: var(--mono); font-size: 11px; color: var(--text-dim); margin-top: 8px; }


.modal-mask {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(5, 8, 20, 0.72); backdrop-filter: blur(4px);
  display: none; align-items: flex-start; justify-content: center; overflow-y: auto; padding: 6vh 16px;
}
.modal-mask.open { display: flex; }
.modal {
  background: #141B3A; border: 1px solid var(--panel-border); border-radius: 18px;
  max-width: 640px; width: 100%; padding: 26px 28px; position: relative;
  box-shadow: 0 24px 70px rgba(0,0,0,.6); animation: pop .18s ease;
}
@keyframes pop { from { transform: scale(.96); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.modal .close {
  position: absolute; top: 14px; right: 18px;
  background: none; border: none; color: var(--silver); font-size: 22px; cursor: pointer;
}
.modal .close:hover { color: var(--gold); }
.modal h2 { font-family: var(--serif); font-size: 24px; color: var(--gold); margin-bottom: 2px; }
.modal h3 { font-family: var(--serif); font-size: 18px; color: var(--gold); margin: 18px 0 6px; }
.modal .meta { color: var(--text-dim); font-size: 13px; font-family: var(--mono); margin-bottom: 12px; }
.modal p { margin: 6px 0; font-size: 14.5px; }
.modal .bio { line-height: 1.85; color: var(--text); font-size: 14.5px; }
.modal .math-block {
  margin-top: 14px; background: rgba(245, 196, 83, 0.07);
  border: 1px solid rgba(245, 196, 83, 0.28); border-radius: 12px; padding: 14px 16px;
}
.modal h3 { font-family: var(--serif); font-size: 18px; color: var(--gold); margin: 18px 0 6px; }
.math-block h3 { margin-top: 0; font-size: 16px; }
.math-example {
  margin-top: 10px; background: rgba(255,255,255,0.05); border-left: 3px solid var(--gold);
  padding: 10px 12px; border-radius: 0 8px 8px 0; font-size: 13.5px; color: var(--silver);
}
.math-example b { color: var(--gold); display: block; margin-bottom: 4px; font-size: 13px; }
.one-liner { font-size: 13px; color: var(--silver); margin: 8px 0 2px; line-height: 1.5; }
.modal .src { font-size: 13px; color: var(--silver); border-left: 2px solid var(--gold); padding-left: 10px; margin: 4px 0; }
.modal .rel { font-size: 13.5px; margin: 4px 0; }
.modal .rel b { color: var(--gold); cursor: pointer; }
.modal .rel b:hover { text-decoration: underline; }

/* ---------- library ---------- */
.book-card { background: var(--panel); border: 1px solid var(--panel-border); border-radius: 16px; padding: 22px; margin-bottom: 22px; }
.book-card h2 { font-family: var(--serif); font-size: 21px; color: var(--text); }
.book-card .author { color: var(--silver); font-size: 14px; margin: 4px 0; }
.book-card .type { display: inline-block; background: var(--gold-soft); color: var(--gold); font-size: 12px; border-radius: 12px; padding: 2px 12px; margin-bottom: 8px; }
.book-card .desc { color: var(--text-dim); font-size: 14px; margin: 8px 0; }
.book-card details { margin-top: 10px; }
.book-card summary { cursor: pointer; color: var(--gold); font-size: 14px; user-select: none; }
.book-card .file { font-family: var(--mono); font-size: 12px; color: var(--text-dim); margin-top: 8px; }
.chapter-list { margin-top: 10px; display: flex; flex-direction: column; gap: 6px; }
.chapter-item { display: flex; gap: 10px; align-items: flex-start; font-size: 13.5px; color: var(--silver); }
.chapter-item input { margin-top: 4px; accent-color: var(--gold); }
.chapter-item.done { color: var(--text-dim); text-decoration: line-through; }
.progress { height: 8px; background: rgba(255,255,255,0.08); border-radius: 6px; overflow: hidden; margin-top: 14px; }
.progress > div { height: 100%; background: linear-gradient(90deg, var(--gold), #E8A23C); border-radius: 6px; transition: width .3s; }
.progress-label { font-size: 12px; color: var(--text-dim); margin-top: 6px; font-family: var(--mono); }

/* ---------- map (地图志) ---------- */
#map-wrap {
  margin-top: 20px; border-radius: 18px; overflow: hidden;
  border: 1px solid var(--panel-border);
  background: radial-gradient(1000px 520px at 50% 30%, rgba(58,111,216,0.12), transparent 70%), #0A0F24;
}
#world-map { width: 100%; display: block; }
#world-map .land {
  fill: rgba(143, 163, 200, 0.12);
  stroke: rgba(143, 163, 200, 0.35);
  stroke-width: 0.5;
}
.star-g {
  cursor: pointer;
  animation: stwinkle 2.4s ease-in-out infinite;
  animation-duration: var(--tw, 2.4s);
}
.star-g:hover { animation-play-state: paused; }
.star { stroke: rgba(11, 16, 38, 0.92); stroke-width: 0.9; }
.star.hovered { stroke: rgba(255, 255, 255, 0.95); stroke-width: 1.2; }
.facet { stroke: rgba(255, 255, 255, 0.25); stroke-width: 0.5; }
@keyframes stwinkle { 0%, 100% { opacity: 1; } 50% { opacity: 0.6; } }
.map-tip {
  display: flex; flex-direction: column; gap: 3px; max-width: 320px;
  white-space: normal; font-size: 12.5px;
}
.map-tip .tip-title { color: var(--text); display: block; }
.map-tip .tip-sub { color: var(--gold); font-size: 11.5px; display: block; }

/* ---------- starfield (legacy, canvas 总览已移除) ---------- */
#starfield-wrap { position: relative; }
#starfield { width: 100%; display: block; border-radius: 18px; border: 1px solid var(--panel-border); background: radial-gradient(1000px 500px at 50% 0%, rgba(58,111,216,0.10), transparent 70%), #0A0F24; }
.star-legend { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 12px; font-size: 12.5px; color: var(--silver); }
.star-legend .leg { display: flex; align-items: center; gap: 6px; }
.star-legend .sw { width: 10px; height: 10px; border-radius: 50%; display: inline-block; }
.hint { color: var(--text-dim); font-size: 13px; margin: 10px 0; }

/* ---------- person panel (starfield side) ---------- */
.detail-panel {
  position: fixed; right: 20px; top: 86px; bottom: 20px; z-index: 60;
  width: 340px; background: rgba(20, 27, 58, 0.94); backdrop-filter: blur(10px);
  border: 1px solid var(--panel-border); border-radius: 16px; padding: 20px;
  overflow-y: auto; transform: translateX(120%); transition: transform .25s ease;
}
.detail-panel.open { transform: translateX(0); }
.detail-panel h2 { font-family: var(--serif); color: var(--gold); font-size: 21px; }
.detail-panel .years { font-family: var(--mono); color: var(--gold); font-size: 13px; margin: 2px 0 8px; }
.detail-panel p { font-size: 13.5px; margin: 6px 0; color: var(--silver); }
.detail-panel .panel-close { float: right; background: none; border: none; color: var(--silver); font-size: 20px; cursor: pointer; }

footer { text-align: center; color: var(--text-dim); font-size: 12px; padding: 30px 0 40px; border-top: 1px solid var(--panel-border); margin-top: 30px; }
footer a { color: var(--gold); text-decoration: none; }

@media (max-width: 760px) {
  .lane { grid-template-columns: 60px 1fr; }
  .axis { padding-left: 70px; }
  .detail-panel { width: calc(100vw - 32px); left: 16px; right: 16px; top: 80px; }
  .header-inner { gap: 8px; padding: 10px 14px; }
}