/* AI4Bio Universe Map — editorial styles */
:root{
  --paper:#FAFAF7;
  --ink:#1A1A1A;
  --ink-2:#3A3A37;
  --gray:#6B6860;
  --gray-2:#8E8B82;
  --rule:#E8E6E0;
  --rule-2:#C4C2BC;
  --cream:#F3F0E8;
  --accent:#B8604A;       /* terracotta */
  --field-a:#E8E6E0;
  --serif: "Source Serif 4","Source Serif Pro","Iowan Old Style","Charter","Georgia",serif;
  --sans:  "Inter","Helvetica Neue","Helvetica","Arial",sans-serif;
  --mono:  "JetBrains Mono","IBM Plex Mono",ui-monospace,monospace;
  --han-serif: "Source Han Serif SC","Songti SC","Noto Serif SC",serif;
  --han-sans:  "Source Han Sans SC","PingFang SC","Noto Sans SC",sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans); font-size:14px; line-height:1.6;
  -webkit-font-smoothing:antialiased; text-rendering:geometricPrecision;}

.shell{ max-width:1480px; margin:0 auto; padding:44px 56px 60px;}

/* Header ---------------------------------------------------------- */
.eyebrow{
  font-family:var(--sans); font-size:10.5px; letter-spacing:0.22em;
  text-transform:uppercase; color:var(--gray);
  display:flex; align-items:center; gap:10px;
}
.eyebrow::before{content:""; width:18px; height:1px; background:var(--ink);}
.title{
  font-family:var(--serif); font-weight:400; font-style:normal;
  font-size:68px; line-height:1.02; letter-spacing:-0.02em;
  margin:14px 0 10px; color:var(--ink);
}
.title em{ font-style:italic; color:var(--accent); font-weight:400;}
.subtitle{ font-family:var(--serif); font-size:19px; line-height:1.5;
  color:var(--gray); max-width:720px; margin:0; font-weight:400;}

.header-rule{ border:0; border-top:1px solid var(--rule); margin:32px 0 22px;}

/* Toolbar --------------------------------------------------------- */
.toolbar{
  display:grid; grid-template-columns: 1fr 2fr 1fr;
  align-items:center; gap:24px; margin-bottom:14px;
}
.search-wrap{ position:relative; width:100%; max-width:520px; justify-self:center;}
.search{
  width:100%; background:transparent; border:0;
  border-bottom:1px solid var(--ink); padding:8px 2px 10px 22px;
  font-family:var(--sans); font-size:14px; color:var(--ink); outline:none;
  letter-spacing:0.01em;
}
.search::placeholder{ color:var(--gray-2); font-style:italic;}
.search-icon{ position:absolute; left:0; top:10px; width:14px; height:14px; color:var(--gray);}
.search:focus{ border-bottom-color:var(--accent);}

.tool-left{ display:flex; gap:6px; align-items:center;}
.zoom-btn{
  width:28px; height:28px; border:1px solid var(--rule-2); background:var(--paper);
  color:var(--ink); font-family:var(--serif); font-size:16px; line-height:1;
  cursor:pointer; display:inline-flex; align-items:center; justify-content:center;
  transition: all .15s ease; padding:0;
}
.zoom-btn:hover{ border-color:var(--ink); color:var(--accent);}
.zoom-label{ font-family:var(--mono); font-size:10.5px; color:var(--gray); margin-left:10px;
  letter-spacing:0.08em;}

.tool-right{ justify-self:end; display:flex; gap:22px; align-items:center;}
.meta-text{ font-family:var(--mono); font-size:10.5px; color:var(--gray);
  letter-spacing:0.08em; text-transform:uppercase;}

/* Canvas ---------------------------------------------------------- */
.canvas-wrap{
  position:relative; width:100%; height:720px;
  background:var(--paper);
  border-top:1px solid var(--rule);
  border-bottom:1px solid var(--rule);
  overflow:hidden;
  user-select:none;
}
.canvas-wrap svg{ width:100%; height:100%; display:block; cursor:grab;}
.canvas-wrap svg.grabbing{ cursor:grabbing;}

/* Legend (sidebar right) ----------------------------------------- */
.legend{
  position:absolute; top:22px; right:22px;
  width:220px; padding:18px 0 4px;
  font-family:var(--sans);
  background:transparent;
  border-left:1px solid var(--rule);
  padding-left:18px;
}
.legend h4{
  font-family:var(--sans); font-size:10px; letter-spacing:0.22em;
  text-transform:uppercase; color:var(--gray); margin:0 0 14px; font-weight:500;
}
.legend-row{ display:flex; align-items:center; gap:12px; padding:7px 0;
  font-size:12px; color:var(--ink-2); cursor:pointer;}
.legend-row:hover{ color:var(--ink);}
.legend-row.dim{ opacity:0.35;}
.legend-swatch{ width:20px; height:20px; display:inline-flex;
  align-items:center; justify-content:center; flex:0 0 20px;}
.legend-count{ margin-left:auto; font-family:var(--mono); font-size:10.5px; color:var(--gray);}

/* Timeline (bottom-left) ----------------------------------------- */
.timeline{
  position:absolute; left:22px; right:270px; bottom:18px;
  font-family:var(--sans);
}
.timeline-label{
  font-family:var(--sans); font-size:10px; letter-spacing:0.22em;
  text-transform:uppercase; color:var(--gray); margin-bottom:10px;
  display:flex; justify-content:space-between; align-items:baseline;
}
.timeline-label .cur{ font-family:var(--mono); color:var(--ink); letter-spacing:0.08em;}
.timeline-track{
  position:relative; height:24px;
}
.timeline-line{ position:absolute; left:0; right:0; top:11px; height:1px; background:var(--rule-2);}
.timeline-fill{ position:absolute; left:0; top:11px; height:1px; background:var(--ink);}
.timeline-tick{
  position:absolute; top:6px; width:1px; height:11px; background:var(--rule-2);
  transform: translateX(-0.5px);
}
.timeline-tick.active{ background:var(--ink);}
.timeline-year{
  position:absolute; top:20px; transform: translateX(-50%);
  font-family:var(--mono); font-size:10px; color:var(--gray); letter-spacing:0.06em;
}
.timeline-year.active{ color:var(--ink);}
.timeline-handle{
  position:absolute; top:5px; width:13px; height:13px; border-radius:50%;
  background:var(--paper); border:1.5px solid var(--ink);
  transform: translateX(-50%); cursor:grab;
  transition: transform .12s ease;
}
.timeline-handle:hover{ transform: translateX(-50%) scale(1.1);}
.timeline-handle.dragging{ cursor:grabbing; background:var(--accent); border-color:var(--accent);}

/* Tooltip --------------------------------------------------------- */
.tip{
  position:absolute; pointer-events:none; z-index:20;
  background:var(--cream); padding:12px 14px 12px 14px;
  border:0; max-width:280px;
  font-family:var(--sans); color:var(--ink);
  opacity:0; transition: opacity .12s ease;
  box-shadow: 0 1px 0 var(--rule);
}
.tip.on{ opacity:1;}
.tip .tip-name{ font-family:var(--serif); font-size:16px; line-height:1.2; color:var(--ink);}
.tip .tip-name .tip-zh{ font-family:var(--han-serif); margin-left:6px; color:var(--ink-2);}
.tip .tip-meta{ font-family:var(--mono); font-size:10px; letter-spacing:0.08em;
  text-transform:uppercase; color:var(--gray); margin:6px 0 8px;}
.tip .tip-desc{ font-size:12.5px; line-height:1.5; color:var(--ink-2);}

/* Drawer ---------------------------------------------------------- */
.drawer{
  position:fixed; top:0; right:0; width:440px; height:100vh;
  background:var(--paper); border-left:1px solid var(--rule);
  padding:44px 40px 40px; overflow-y:auto; z-index:50;
  transform: translateX(105%); transition: transform .32s cubic-bezier(.2,.7,.2,1);
  display:flex; flex-direction:column; gap:0;
}
.drawer.on{ transform: translateX(0);}
.drawer-close{
  position:absolute; top:22px; right:22px; width:30px; height:30px;
  border:0; background:transparent; font-family:var(--serif); font-size:22px;
  color:var(--gray); cursor:pointer; line-height:1;
}
.drawer-close:hover{ color:var(--accent);}
.drawer-eyebrow{
  font-family:var(--sans); font-size:10px; letter-spacing:0.22em;
  text-transform:uppercase; color:var(--gray); margin-bottom:10px;
}
.drawer-name{
  font-family:var(--serif); font-size:40px; line-height:1.05; letter-spacing:-0.01em;
  margin:0 0 4px; color:var(--ink); font-weight:400;
}
.drawer-name .zh{ font-family:var(--han-serif); display:block; font-size:22px;
  color:var(--ink-2); margin-top:4px;}
.drawer-year{ font-family:var(--mono); font-size:11px; color:var(--accent);
  letter-spacing:0.12em; margin-top:8px;}
.drawer hr{ border:0; border-top:1px solid var(--rule); margin:22px 0;}
.drawer-field{ margin-bottom:18px;}
.drawer-field h5{
  font-family:var(--sans); font-size:10px; letter-spacing:0.22em;
  text-transform:uppercase; color:var(--gray); margin:0 0 6px; font-weight:500;
}
.drawer-field p{ margin:0; font-size:14px; line-height:1.6; color:var(--ink-2);}
.drawer-field .serif{ font-family:var(--serif); font-size:17px; line-height:1.5; color:var(--ink);}
.related{ display:flex; flex-wrap:wrap; gap:6px;}
.related button{
  font-family:var(--sans); font-size:12px; color:var(--ink-2);
  background:transparent; border:1px solid var(--rule-2); padding:5px 10px;
  cursor:pointer; transition: all .15s;
}
.related button:hover{ border-color:var(--ink); color:var(--accent);}

/* Footer ---------------------------------------------------------- */
.footer{
  display:flex; justify-content:space-between; align-items:baseline;
  padding-top:22px; margin-top:14px;
  border-top:1px solid var(--rule);
  font-family:var(--mono); font-size:10.5px; letter-spacing:0.08em;
  color:var(--gray); text-transform:uppercase;
}
.footer .right .han{ font-family:var(--han-sans); margin-right:8px; letter-spacing:0.05em;}

/* node classes applied to svg shapes ------------------------------ */
.node{ cursor:pointer; transition: opacity .18s;}
.node-label{ font-family:var(--sans); font-size:12px; fill:var(--ink);
  pointer-events:none; transition: opacity .18s, fill .18s;}
.node-label.han{ font-family:var(--han-sans);}
.edge{ stroke: var(--rule-2); stroke-width:0.5; fill:none;
  transition: stroke .18s, opacity .18s, stroke-width .18s;}
.field-rect{ transition: opacity .2s;}
.field-label{ font-family:var(--sans); font-size:10px; letter-spacing:0.22em;
  text-transform:uppercase; fill:var(--gray); pointer-events:none;}
.field-label-zh{ font-family:var(--han-sans); font-size:10px; fill:var(--gray-2); letter-spacing:0.05em;}

.dimmed .node:not(.active):not(.neighbor){ opacity:0.2;}
.dimmed .node-label:not(.active):not(.neighbor){ opacity:0.2;}
.dimmed .edge:not(.active){ opacity:0.06;}
.dimmed .edge.active{ stroke:var(--ink); stroke-width:0.9;}

@media (max-width: 980px){
  .shell{ padding:28px 22px;}
  .title{ font-size:44px;}
  .toolbar{ grid-template-columns: 1fr; gap:12px;}
  .tool-right{ justify-self:start;}
  .canvas-wrap{ height:560px;}
  .legend{ display:none;}
  .timeline{ right:22px;}
  .drawer{ width:100%;}
}