/* ---------------------------------------------------------------- tokens */
:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f1f3f6;
  --ink: #111827;
  --ink-2: #4b5563;
  --ink-3: #6b7280;
  --line: #e3e6eb;
  --line-strong: #cfd4dc;
  --accent: #1f5fbf;
  --accent-ink: #ffffff;
  --accent-soft: #e8f0fc;
  --danger: #b42318;
  --series-1: #2a78d6;
  --shadow: 0 1px 2px rgb(16 24 40 / 6%), 0 1px 3px rgb(16 24 40 / 8%);
  --shadow-lg: 0 12px 32px rgb(16 24 40 / 14%);
  --radius: 10px;
  --radius-sm: 6px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #111214;
    --surface: #1a1b1e;
    --surface-2: #232529;
    --ink: #f3f4f6;
    --ink-2: #c4c7cd;
    --ink-3: #9aa0a8;
    --line: #2c2f34;
    --line-strong: #3a3e45;
    --accent: #5b9bf0;
    --accent-ink: #0b1220;
    --accent-soft: #1b2a40;
    --danger: #f97066;
    --series-1: #3987e5;
    --shadow: 0 1px 2px rgb(0 0 0 / 40%);
    --shadow-lg: 0 12px 32px rgb(0 0 0 / 50%);
  }
}

/* ---------------------------------------------------------------- base */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.6 var(--font); min-height: 100vh; display: flex; flex-direction: column; }
main { flex: 1; width: 100%; max-width: 1120px; margin: 0 auto; padding: 24px 16px 48px; outline: none; }
h1, h2, h3 { line-height: 1.3; margin: 0; }
h1 { font-size: 28px; font-weight: 700; letter-spacing: -0.01em; }
h2 { font-size: 18px; font-weight: 650; }
h3 { font-size: 15px; font-weight: 650; }
p { margin: 0; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.9em; background: var(--surface-2); padding: 1px 5px; border-radius: 4px; }
.muted { color: var(--ink-3); }
.small { font-size: 13px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--surface); padding: 8px 12px; z-index: 50; }
.skip:focus { left: 8px; }
.section { margin-top: 32px; }
.section-sm { margin-top: 12px; }
.section-xs { margin-top: 8px; }
.stack { display: flex; flex-direction: column; gap: 12px; }
.stack-xs { display: flex; flex-direction: column; gap: 2px; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

/* ---------------------------------------------------------------- top bar */
.topbar { background: var(--surface); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 20; }
.topbar-inner { max-width: 1120px; margin: 0 auto; padding: 0 16px; height: 60px; display: flex; align-items: center; gap: 24px; }
.brand { display: flex; align-items: center; gap: 8px; color: var(--ink); font-weight: 700; font-size: 17px; }
.brand:hover { text-decoration: none; }
.brand-mark { color: var(--accent); display: grid; place-items: center; }
.mainnav { display: flex; gap: 4px; flex: 1; }
.mainnav a { color: var(--ink-2); padding: 8px 12px; border-radius: var(--radius-sm); font-weight: 500; white-space: nowrap; }
.mainnav a:hover { background: var(--surface-2); text-decoration: none; }
.mainnav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }
.account { display: flex; align-items: center; gap: 8px; }
.account .who { color: var(--ink-2); font-size: 14px; max-width: 220px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ---------------------------------------------------------------- controls */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; height: 38px; padding: 0 16px; border-radius: var(--radius-sm); border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink); font: 500 14px/1 var(--font); cursor: pointer; white-space: nowrap; }
.btn:hover { background: var(--surface-2); text-decoration: none; }
.btn[disabled] { opacity: 0.55; cursor: progress; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: var(--accent); filter: brightness(1.08); }
.btn-ghost { border-color: transparent; background: transparent; color: var(--ink-2); }
.btn-ghost:hover { background: var(--surface-2); }
.btn-danger { color: var(--danger); }
.btn-sm { height: 32px; padding: 0 12px; font-size: 13px; }
.btn-lg { height: 46px; padding: 0 22px; font-size: 15px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field > span { font-size: 13px; font-weight: 500; color: var(--ink-2); }
input, select, textarea { font: 15px/1.5 var(--font); color: var(--ink); background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--radius-sm); padding: 8px 12px; min-height: 38px; width: 100%; }
textarea { min-height: 120px; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }

/* ---------------------------------------------------------------- page pieces */
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }
.page-head p { color: var(--ink-3); margin-top: 4px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.card-pad { padding: 20px; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.searchbar { display: grid; grid-template-columns: minmax(0, 1fr) 180px auto; gap: 8px; }
.searchbar input, .searchbar select { height: 46px; font-size: 16px; }

/* ---------------------------------------------------------------- landing */
.hero { padding: 32px 0 8px; text-align: center; }
.hero h1 { font-size: 36px; }
.hero p { color: var(--ink-2); font-size: 17px; margin: 12px auto 24px; max-width: 640px; }
.hero .searchbar { max-width: 760px; margin: 0 auto; }
.hero-hints { margin-top: 12px; display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; font-size: 13px; color: var(--ink-3); align-items: center; }
.chip { border: 1px solid var(--line-strong); background: var(--surface); color: var(--ink-2); border-radius: 999px; padding: 3px 12px; cursor: pointer; font: 13px var(--font); }
.chip:hover { border-color: var(--accent); color: var(--accent); }
.stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-top: 32px; }
.stat { padding: 16px 20px; }
.stat strong { display: block; font-size: 26px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat span { color: var(--ink-3); font-size: 13px; }
.charts { display: grid; grid-template-columns: 1.3fr 1fr; gap: 16px; }
.charts .card:first-child { grid-row: span 2; }
.chart-card { padding: 20px; min-width: 0; }
.chart-card h3 { margin-bottom: 4px; }
.chart-card .sub { color: var(--ink-3); font-size: 13px; margin-bottom: 12px; }
.chart-tip { position: fixed; z-index: 60; pointer-events: none; background: var(--ink); color: var(--bg); padding: 6px 10px; border-radius: 6px; font-size: 12px; box-shadow: var(--shadow-lg); white-space: nowrap; }
.hbars { display: flex; flex-direction: column; gap: 10px; }
.hbar-label { font-size: 13px; color: var(--ink-2); line-height: 1.3; margin-bottom: 4px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.hbar-track { display: flex; align-items: center; gap: 8px; height: 16px; }
.hbar-fill { height: 14px; background: var(--series-1); border-radius: 0 4px 4px 0; min-width: 2px; }
.hbar-val { font-size: 12px; font-weight: 600; color: var(--ink); font-variant-numeric: tabular-nums; }
.hbar:hover .hbar-fill, .col:hover .col-bar { filter: brightness(1.12); }
.hbars-inline .hbar { display: grid; grid-template-columns: 84px minmax(0, 1fr); align-items: center; gap: 8px; }
.hbars-inline .hbar-label { margin: 0; }
.cols { display: flex; gap: 6px; padding-top: 4px; }
.col { flex: 1; display: flex; flex-direction: column; align-items: center; min-width: 0; }
.col-plot { height: 180px; width: 100%; display: flex; flex-direction: column; justify-content: flex-end; align-items: center; border-bottom: 1px solid var(--line-strong); }
.col-bar { width: min(24px, 70%); background: var(--series-1); border-radius: 4px 4px 0 0; min-height: 2px; }
.col-val { font-size: 12px; font-weight: 600; color: var(--ink); margin-bottom: 4px; font-variant-numeric: tabular-nums; white-space: nowrap; }
.col-x { font-size: 11px; color: var(--ink-3); margin-top: 4px; }

/* ---------------------------------------------------------------- results */
.results { display: flex; flex-direction: column; gap: 10px; }
.person { display: block; padding: 16px 20px; color: inherit; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
a.person:hover { text-decoration: none; border-color: var(--accent); }
.person-top { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.person-name { font-size: 16px; font-weight: 650; color: var(--ink); }
.person-org { color: var(--ink-2); font-size: 14px; }
.person-summary { color: var(--ink-2); font-size: 14px; margin-top: 6px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.person-meta { display: flex; gap: 16px; margin-top: 8px; color: var(--ink-3); font-size: 13px; flex-wrap: wrap; font-variant-numeric: tabular-nums; }
.person-actions { display: flex; gap: 8px; margin-top: 10px; align-items: center; flex-wrap: wrap; }
.badge { display: inline-flex; align-items: center; height: 22px; padding: 0 8px; border-radius: 999px; font-size: 12px; font-weight: 500; background: var(--surface-2); color: var(--ink-2); white-space: nowrap; }
.badge-early { background: #e7f6ec; color: #08603a; }
.badge-mid { background: #eaf1fd; color: #1d4f9e; }
.badge-established { background: #f2ecfb; color: #5a32a3; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .badge-early { background: #12301f; color: #75e0a7; }
  :root:not([data-theme="light"]) .badge-mid { background: #15263f; color: #84b4f5; }
  :root:not([data-theme="light"]) .badge-established { background: #2a1d40; color: #c4a8f5; }
}
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.tag { font-size: 12px; padding: 2px 8px; border-radius: 4px; background: var(--surface-2); color: var(--ink-2); }

/* visitor preview: placeholder text only - real data is never sent */
.locked-wrap { position: relative; margin-top: 10px; }
.locked-list { display: flex; flex-direction: column; gap: 10px; filter: blur(5px); user-select: none; pointer-events: none; }
.locked-cta { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 12px; text-align: center; padding: 16px; background: linear-gradient(to bottom, color-mix(in srgb, var(--bg) 40%, transparent), var(--bg) 70%); }
.locked-cta strong { font-size: 18px; }

/* ---------------------------------------------------------------- auth & forms */
.auth { max-width: 400px; margin: 32px auto; }
.auth.wide { max-width: 560px; }
.auth h1 { font-size: 24px; margin-bottom: 4px; }
.auth form { display: flex; flex-direction: column; gap: 16px; margin-top: 24px; }
.auth .switch { text-align: center; margin-top: 16px; color: var(--ink-3); font-size: 14px; }
.form-error { color: var(--danger); font-size: 14px; min-height: 1em; }

/* ---------------------------------------------------------------- profile */
.profile-head { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; flex-wrap: wrap; margin-top: 8px; }
.profile-head h1 { font-size: 26px; }
.kpis { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-top: 20px; }
.kpi { padding: 14px 16px; }
.kpi strong { display: block; font-size: 22px; font-variant-numeric: tabular-nums; }
.kpi span { color: var(--ink-3); font-size: 13px; }
.profile-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 16px; margin-top: 16px; align-items: start; }
.explain { margin-top: 10px; color: var(--ink-2); font-size: 14px; }
.paper { padding: 14px 0; border-top: 1px solid var(--line); }
.paper:first-of-type { border-top: 0; }
.paper-title { font-weight: 600; color: var(--ink); }
.paper-meta { color: var(--ink-3); font-size: 13px; margin-top: 2px; }
.list-plain { list-style: none; padding: 0; margin: 0; }
.list-plain li { display: flex; justify-content: space-between; gap: 8px; padding: 6px 0; border-top: 1px solid var(--line); font-size: 14px; }
.list-plain li:first-child { border-top: 0; }
.graph-box { position: relative; width: 100%; aspect-ratio: 16 / 9; background: var(--surface-2); border-radius: var(--radius-sm); }
.graph-box canvas { width: 100%; height: 100%; display: block; }
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 12px; color: var(--ink-3); margin-top: 8px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 6px; vertical-align: -1px; }
.legend .l-root { background: #1f5fbf; } .legend .l-co { background: #8aa4c8; }
.legend .l-first { background: #eb6834; border-radius: 2px; } .legend .l-paper { background: #f2b48f; border-radius: 2px; }

/* ---------------------------------------------------------------- pools */
.pools-layout { display: grid; grid-template-columns: 260px minmax(0, 1fr); gap: 16px; align-items: start; }
.pool-list { padding: 8px; }
.pool-list button { width: 100%; text-align: left; display: flex; justify-content: space-between; gap: 8px; padding: 10px 12px; border: 0; background: transparent; border-radius: var(--radius-sm); font: 14px var(--font); color: var(--ink); cursor: pointer; }
.pool-list button:hover { background: var(--surface-2); }
.pool-list button[aria-current="true"] { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.pool-new { display: flex; gap: 8px; padding: 8px; border-top: 1px solid var(--line); margin-top: 4px; }

/* ---------------------------------------------------------------- states */
.empty { text-align: center; padding: 48px 16px; color: var(--ink-3); }
.empty strong { display: block; color: var(--ink); font-size: 16px; margin-bottom: 4px; }
.skeleton { background: linear-gradient(90deg, var(--surface-2), var(--line), var(--surface-2)); background-size: 200% 100%; animation: shimmer 1.2s infinite; border-radius: 6px; height: 14px; }
.skeleton.w40 { width: 40%; } .skeleton.w55 { width: 55%; } .skeleton.w70 { width: 70%; }
.skel-card { padding: 16px 20px; display: flex; flex-direction: column; gap: 10px; }
.skel-card + .skel-card { margin-top: 10px; }
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }
@media (prefers-reduced-motion: reduce) { .skeleton { animation: none; } }
.notice { padding: 12px 16px; border-radius: var(--radius-sm); background: var(--accent-soft); color: var(--ink); font-size: 14px; }
.notice.error { background: color-mix(in srgb, var(--danger) 12%, var(--surface)); }
.meter .track { height: 6px; background: var(--surface-2); border-radius: 3px; margin-top: 4px; overflow: hidden; }
.meter .fill { height: 100%; width: 0; background: var(--series-1); border-radius: 3px; }
.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%) translateY(20px); opacity: 0; transition: all .2s; background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 8px; font-size: 14px; z-index: 70; pointer-events: none; max-width: calc(100% - 32px); }
.toast.show { opacity: 1; transform: translateX(-50%); }
.dialog { border: 0; border-radius: var(--radius); padding: 0; width: min(420px, calc(100% - 32px)); background: var(--surface); color: var(--ink); box-shadow: var(--shadow-lg); }
.dialog::backdrop { background: rgb(0 0 0 / 35%); }
.dialog form { padding: 20px; display: flex; flex-direction: column; gap: 14px; }
.dialog .actions { display: flex; justify-content: flex-end; gap: 8px; }
.footer { border-top: 1px solid var(--line); background: var(--surface); }
.footer-inner { max-width: 1120px; margin: 0 auto; padding: 16px; display: flex; justify-content: space-between; gap: 12px; color: var(--ink-3); font-size: 13px; flex-wrap: wrap; align-items: flex-start; }
.footer .purchase { color: var(--ink-2); font-weight: 500; }

/* ---------------------------------------------------------------- responsive */
@media (max-width: 900px) {
  .charts, .profile-grid, .pools-layout { grid-template-columns: 1fr; }
  .charts .card:first-child { grid-row: auto; }
}
@media (max-width: 640px) {
  body { font-size: 14px; }
  .topbar-inner { height: auto; flex-wrap: wrap; gap: 8px 12px; padding: 10px 16px 0; }
  .mainnav { order: 3; flex-basis: 100%; overflow-x: auto; scrollbar-width: none; margin: 0 -16px; padding: 0 12px 6px; }
  .mainnav::-webkit-scrollbar { display: none; }
  .account { margin-left: auto; }
  .account .who { display: none; }
  .hero h1 { font-size: 26px; }
  .hero p { font-size: 15px; }
  .searchbar { grid-template-columns: 1fr 1fr; }
  .searchbar input { grid-column: 1 / -1; }
  .stats, .kpis { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat strong.date { font-size: 20px; }
  h1 { font-size: 22px; }
}
.meter .row { justify-content: space-between; }

.tabs { display: flex; gap: 4px; margin-bottom: 12px; border-bottom: 1px solid var(--line); }
.tabs button { border: 0; background: transparent; padding: 8px 16px; font: 500 15px var(--font); color: var(--ink-2); cursor: pointer; border-bottom: 2px solid transparent; margin-bottom: -1px; }
.tabs button[aria-selected="true"] { color: var(--accent); border-bottom-color: var(--accent); }
.searchbar.no-stage { grid-template-columns: minmax(0, 1fr) auto; }
.relevance { font-size: 13px; color: var(--ink-2); margin-top: 8px; }
.relevance b, .paper-card b { color: var(--ink); font-variant-numeric: tabular-nums; }
.paper-card .person-name a { color: var(--ink); }
@media (max-width: 640px) { .searchbar.no-stage { grid-template-columns: 1fr; } .searchbar.no-stage input { grid-column: auto; } }
.lang-switch { font-weight: 600; }

/* ---------------------------------------------------------------- knowledge graph
   Entity type = colour + shape (graph.js). Hues: reference categorical slots 1-3 (validated all-pairs),
   taxonomy levels in neutral greys; dark-mode steps from the same ramps. */
:root { --kg-person: #2a78d6; --kg-institution: #eb6834; --kg-topic: #1baf7a; --kg-subfield: #8b9099; --kg-field: #5c626b; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) { --kg-person: #3987e5; --kg-institution: #d95926; --kg-topic: #199e70; --kg-subfield: #8d939c; --kg-field: #b5bac2; }
}
.kg { position: relative; width: 100%; height: 520px; background: var(--surface-2); border-radius: var(--radius-sm); overflow: hidden; touch-action: none; }
.kg-canvas { width: 100%; height: 100%; display: block; cursor: grab; outline: none; }
.kg-canvas:focus-visible { box-shadow: inset 0 0 0 2px var(--accent); }
.kg-tip { position: absolute; z-index: 2; pointer-events: none; background: var(--ink); color: var(--bg); padding: 5px 9px; border-radius: 6px; font-size: 12px; white-space: nowrap; max-width: 90%; overflow: hidden; text-overflow: ellipsis; }
.explorer { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 12px; }
.explorer-side { display: flex; flex-direction: column; gap: 12px; }
.kg-panel { padding: 14px 16px; min-height: 120px; }
.kg-panel h3 { margin: 6px 0 4px; font-size: 16px; }
.kg-panel .row { margin-top: 10px; }
.kg-legend { display: flex; flex-direction: column; gap: 6px; padding: 12px 16px; font-size: 13px; }
.kg-legend label { display: flex; align-items: center; gap: 8px; cursor: pointer; color: var(--ink-2); }
.kg-legend input { width: auto; min-height: 0; margin: 0; }
.kg-legend svg { flex: none; }
.kg-hint { font-size: 12px; color: var(--ink-3); }
.kind-badge { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; color: var(--ink-3); }
.crumbs { font-size: 13px; color: var(--ink-3); display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.entity-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 16px; }
.mini-list { list-style: none; padding: 0; margin: 8px 0 0; }
.mini-list li { display: flex; justify-content: space-between; gap: 8px; padding: 6px 0; border-top: 1px solid var(--line); font-size: 14px; }
.mini-list li:first-child { border-top: 0; }
.mini-list .muted { white-space: nowrap; }
.entity-chips { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 12px; font-size: 13px; color: var(--ink-3); }
.entity-chip { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line-strong); background: var(--surface); border-radius: 999px; padding: 3px 12px 3px 8px; color: var(--ink); font-size: 13px; }
.entity-chip:hover { border-color: var(--accent); text-decoration: none; }
.field-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.field-card { display: block; padding: 14px 16px; color: inherit; }
.field-card:hover { text-decoration: none; border-color: var(--accent); }
.field-card strong { display: block; }
.landscape { height: 460px; }
@media (max-width: 900px) {
  .explorer { grid-template-columns: 1fr; }
  .entity-grid { grid-template-columns: 1fr; }
  .kg { height: 420px; }
}
@media (max-width: 640px) { .kg { height: 360px; } .landscape { height: 380px; } }
.tag-link { display: inline-flex; align-items: center; gap: 4px; color: var(--ink-2); } .tag-link:hover { color: var(--accent); text-decoration: none; }