:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --panel-2: #fbfbfd;
  --ink: #1a1d23;
  --ink-soft: #565b66;
  --ink-faint: #8b909b;
  --line: #e6e8ec;
  --accent: #2f6df6;
  --accent-soft: #e8f0ff;
  --hyp: #7b3fe4;   --hyp-bg: #f2ecfd;
  --met: #0e8a6a;   --met-bg: #e4f5ef;
  --the: #b8690a;   --the-bg: #fbf0df;
  --con: #c0344d;   --con-bg: #fce8ec;
  --shadow: 0 1px 3px rgba(20,25,40,.06), 0 6px 24px rgba(20,25,40,.05);
  --radius: 14px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1015; --panel: #171a21; --panel-2: #1d2129; --ink: #e9ecf1;
    --ink-soft: #a8aebb; --ink-faint: #6b7280; --line: #262b34;
    --accent: #5b8cff; --accent-soft: #1b2740;
    --hyp: #b79bf0; --hyp-bg: #241c3a; --met: #4fcfa6; --met-bg: #10352b;
    --the: #e2a94e; --the-bg: #352a17; --con: #f0879c; --con-bg: #35181f;
    --shadow: 0 1px 3px rgba(0,0,0,.3), 0 8px 30px rgba(0,0,0,.35);
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg); color: var(--ink); line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---- Header ---- */
header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { max-width: 1400px; margin: 0 auto; padding: 14px 24px; display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.brand { display: flex; align-items: center; gap: 12px; }
.logo { width: 34px; height: 34px; border-radius: 9px; background: linear-gradient(135deg, var(--accent), #7b3fe4); display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 18px; }
.brand h1 { font-size: 17px; margin: 0; letter-spacing: -.2px; }
.brand p { margin: 0; font-size: 12px; color: var(--ink-faint); }
.stats { display: flex; gap: 22px; margin-left: auto; }
.stat b { font-size: 18px; display: block; letter-spacing: -.3px; }
.stat span { font-size: 11px; color: var(--ink-faint); text-transform: uppercase; letter-spacing: .5px; }

/* ---- Layout ---- */
.wrap { max-width: 1400px; margin: 0 auto; padding: 22px 24px 60px; display: grid; grid-template-columns: 300px 1fr; gap: 22px; align-items: start; }
@media (max-width: 940px) { .wrap { grid-template-columns: 1fr; } aside { position: static !important; } }

aside { position: sticky; top: 78px; display: flex; flex-direction: column; gap: 16px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.card h3 { font-size: 12px; text-transform: uppercase; letter-spacing: .6px; color: var(--ink-faint); margin: 0; padding: 14px 16px 8px; }

/* sidebar chart */
.bars { padding: 4px 12px 14px; display: flex; flex-direction: column; gap: 5px; max-height: 340px; overflow-y: auto; }
.bar-row { display: grid; grid-template-columns: 1fr; gap: 2px; cursor: pointer; padding: 4px 6px; border-radius: 8px; }
.bar-row:hover { background: var(--panel-2); }
.bar-row.active { background: var(--accent-soft); }
.bar-label { display: flex; justify-content: space-between; font-size: 12px; }
.bar-label .n { color: var(--ink-faint); font-variant-numeric: tabular-nums; }
.bar-track { height: 6px; background: var(--line); border-radius: 4px; overflow: hidden; }
.bar-fill { height: 100%; background: linear-gradient(90deg, var(--accent), #7b3fe4); border-radius: 4px; }

.domain-list { padding: 6px 12px 14px; display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font-size: 12px; padding: 4px 10px; border-radius: 999px; border: 1px solid var(--line); background: var(--panel-2); color: var(--ink-soft); cursor: pointer; user-select: none; }
.chip:hover { border-color: var(--accent); color: var(--accent); }
.chip.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ---- Toolbar ---- */
.toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin-bottom: 16px; }
.search { flex: 1; min-width: 220px; position: relative; }
.search input { width: 100%; padding: 11px 14px 11px 38px; border: 1px solid var(--line); border-radius: 11px; background: var(--panel); color: var(--ink); font-size: 14px; }
.search input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.search svg { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--ink-faint); }
select { padding: 10px 12px; border: 1px solid var(--line); border-radius: 11px; background: var(--panel); color: var(--ink); font-size: 13px; cursor: pointer; }
.count { font-size: 13px; color: var(--ink-faint); margin-left: auto; }

/* ---- Paper cards ---- */
.papers { display: flex; flex-direction: column; gap: 12px; }
.paper { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px 18px; transition: border-color .15s; }
.paper:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
.paper-head { display: flex; gap: 12px; align-items: flex-start; }
.paper-title { font-size: 15.5px; font-weight: 650; letter-spacing: -.2px; margin: 0; flex: 1; }
.paper-meta { font-size: 12.5px; color: var(--ink-faint); margin: 5px 0 0; display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.pill { font-size: 11px; padding: 2px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-weight: 600; white-space: nowrap; }
.cites { display: inline-flex; align-items: center; gap: 4px; font-variant-numeric: tabular-nums; font-weight: 600; color: var(--ink-soft); }

.fields { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 13px; }
@media (max-width: 620px) { .fields { grid-template-columns: 1fr; } }
.field { border-radius: 10px; padding: 9px 11px; font-size: 13px; background: var(--panel-2); border: 1px solid var(--line); }
.field .lab { font-size: 10px; text-transform: uppercase; letter-spacing: .6px; font-weight: 700; margin-bottom: 3px; display: inline-flex; align-items: center; gap: 5px; }
.field .lab::before { content: ""; width: 7px; height: 7px; border-radius: 2px; }
.field.hyp .lab { color: var(--hyp); } .field.hyp .lab::before { background: var(--hyp); } .field.hyp { background: var(--hyp-bg); }
.field.met .lab { color: var(--met); } .field.met .lab::before { background: var(--met); } .field.met { background: var(--met-bg); }
.field.the .lab { color: var(--the); } .field.the .lab::before { background: var(--the); } .field.the { background: var(--the-bg); }
.field.con .lab { color: var(--con); } .field.con .lab::before { background: var(--con); } .field.con { background: var(--con-bg); }
.field .txt { color: var(--ink); }
.field.empty .txt { color: var(--ink-faint); font-style: italic; }

.paper-foot { display: flex; gap: 10px; align-items: center; margin-top: 12px; flex-wrap: wrap; }
.concepts { display: flex; gap: 5px; flex-wrap: wrap; }
.concept { font-size: 11px; color: var(--ink-faint); background: var(--panel-2); border: 1px solid var(--line); padding: 1px 7px; border-radius: 6px; }
.links { margin-left: auto; display: flex; gap: 12px; font-size: 12.5px; }

/* label tagging (foundation for the labeling site) */
.labelbar { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; margin-top: 10px; padding-top: 10px; border-top: 1px dashed var(--line); }
.labelbar .k { font-size: 10px; text-transform: uppercase; letter-spacing: .6px; color: var(--ink-faint); font-weight: 700; }
.tag { font-size: 12px; padding: 3px 9px; border-radius: 999px; border: 1px solid var(--line); background: var(--panel-2); color: var(--ink-soft); cursor: pointer; }
.tag.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.tag:hover { border-color: var(--accent); }

.empty-state { text-align: center; padding: 60px 20px; color: var(--ink-faint); }
.loading { text-align: center; padding: 80px; color: var(--ink-faint); }
.more { display: block; width: 100%; padding: 13px; margin-top: 14px; border: 1px dashed var(--line); border-radius: 12px; background: var(--panel); color: var(--accent); font-size: 14px; font-weight: 600; cursor: pointer; }
.more:hover { background: var(--accent-soft); }
.note { font-size: 12px; color: var(--ink-faint); padding: 0 16px 14px; }