:root {
  --bg: #ffffff;
  --panel: #f7f8fa;
  --panel-2: #eef1f5;
  --border: #dce1e8;
  --text: #1b2330;
  --muted: #6b7685;
  --accent: #2f6fd6;
  --accent-2: #2f6fd6;
  --link: #5f7d2e;          /* olive-green name links, AcademicTree-style */
  --green: #3a8a3f;
  --amber: #b07d0a;
  --red: #d23b3b;
  --radius: 10px;
  --shadow: 0 6px 24px rgba(20, 30, 50, 0.12);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

h1, h2 { margin: 0; }
.muted { color: var(--muted); }
hr { border: none; border-top: 1px solid var(--border); margin: 1rem 0; }

/* ---- Top bar ---- */
.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 1rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  z-index: 20;
}
.brand { display: flex; align-items: center; gap: 0.5rem; }
.brand h1 { font-size: 1.05rem; font-weight: 650; white-space: nowrap; }
.logo { width: 26px; height: 26px; flex-shrink: 0; display: block; }

.search { position: relative; flex: 1; max-width: 520px; }
.search input {
  width: 100%;
  padding: 0.55rem 0.8rem;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-size: 0.95rem;
}
.search input:focus { outline: none; border-color: var(--accent); }
.search-results {
  position: absolute;
  top: calc(100% + 4px);
  left: 0; right: 0;
  margin: 0; padding: 0.3rem;
  list-style: none;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  max-height: 320px;
  overflow-y: auto;
  z-index: 30;
}
.search-results li {
  padding: 0.5rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
}
.search-results li:hover, .search-results li.active { background: var(--panel); }
.search-results .sr-name { font-weight: 600; }
.search-results .sr-meta { font-size: 0.8rem; color: var(--muted); }

.actions { display: flex; gap: 0.5rem; align-items: center; }

/* ---- Buttons ---- */
.btn {
  font: inherit;
  padding: 0.5rem 0.9rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { border-color: var(--accent); }
.btn-primary { background: var(--accent-2); border-color: var(--accent-2); color: #fff; }
.btn-primary:hover { background: #2860bd; }
.btn-ghost { background: transparent; }
.chip {
  font: inherit;
  font-size: 0.82rem;
  padding: 0.35rem 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.92);
  color: var(--text);
  cursor: pointer;
  backdrop-filter: blur(4px);
}
.chip:hover { border-color: var(--accent); }

/* ---- Layout ---- */
.layout { flex: 1; display: flex; min-height: 0; }
.graph-wrap { flex: 1; position: relative; min-width: 0; background: var(--bg); }
#cy { width: 100%; height: 100%; }

/* Text-only graph nodes (AcademicTree style): green name + plain institution. */
.gnode {
  text-align: center;
  font-size: 13px;
  line-height: 1.3;
  pointer-events: none;
  width: 150px;
  transition: opacity 0.15s;
}
.gnode .gname { color: var(--link); font-weight: 600; }
.gnode .ginst { color: var(--text); font-size: 12px; }
.gnode.sela .gname, .gnode.selb .gname { text-decoration: underline; font-weight: 700; }
.gnode.sela .gname { color: var(--green); }
.gnode.selb .gname { color: var(--amber); }
.gnode.onpath .gname { color: var(--accent); }
.gnode.focus .gname { font-weight: 800; }
.gnode.dim { opacity: 0.25; }
.gnode.hidden { display: none; }

.graph-controls {
  position: absolute;
  top: 0.75rem; left: 0.75rem;
  display: flex; gap: 0.4rem;
  z-index: 10;
}

.path-banner {
  position: absolute;
  bottom: 0.75rem; left: 50%;
  transform: translateX(-50%);
  background: var(--panel-2);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 0.6rem 1rem;
  box-shadow: var(--shadow);
  max-width: 90%;
  font-size: 0.92rem;
}
.path-banner .deg { color: var(--accent); font-weight: 700; }
.banner-btn {
  display: block;
  margin: 0.5rem auto 0;
  font: inherit;
  font-size: 0.85rem;
  padding: 0.3rem 0.7rem;
  border-radius: 7px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
.banner-btn:hover { background: #2860bd; }

.legend {
  position: absolute;
  bottom: 0.75rem; left: 0.75rem;
  display: flex; flex-direction: column; gap: 0.3rem;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 0.8rem;
  font-size: 0.8rem;
  backdrop-filter: blur(4px);
  z-index: 10;
}
.legend-title { color: var(--muted); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.04em; }
.legend-item { display: flex; align-items: center; gap: 0.5rem; }
.legend .swatch { width: 22px; height: 0; border-top-width: 3px; border-top-style: solid; display: inline-block; }
.legend .swatch.phd { border-top-color: #8b97a4; }
.legend .swatch.coadvisor { border-top-color: #2f6fd6; border-top-style: dashed; }
.legend .swatch.postdoc { border-top-color: #3a8a3f; border-top-style: dashed; }
.legend .swatch.ms { border-top-color: #8957c7; }
.legend .swatch.mentor { border-top-color: #b07d0a; border-top-style: dotted; }
.legend .swatch.collaborator { border-top-color: #1f9aa8; border-top-style: dashed; }
.legend .swatch.other { border-top-color: #9aa7b4; border-top-style: dashed; }

.empty-state {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: var(--muted);
}

/* ---- Side panel ---- */
.side-panel {
  width: 340px;
  flex-shrink: 0;
  background: var(--panel);
  border-left: 1px solid var(--border);
  padding: 1.2rem;
  overflow-y: auto;
}
.panel-hint h2 { font-size: 1rem; margin-bottom: 0.6rem; }
.panel-hint ul { padding-left: 1.1rem; color: var(--muted); line-height: 1.6; }

.person-card h2 { font-size: 1.25rem; margin-bottom: 0.2rem; }
.person-card .sub { color: var(--muted); margin-bottom: 0.8rem; }
.person-card .facts { display: grid; grid-template-columns: auto 1fr; gap: 0.3rem 0.8rem; font-size: 0.9rem; margin-bottom: 1rem; }
.person-card .facts dt { color: var(--muted); }
.person-card .facts dd { margin: 0; }

.card-h { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); margin: 1.1rem 0 0.4rem; }
.affil-list { list-style: none; padding: 0; margin: 0; font-size: 0.9rem; }
.affil-list li { padding: 0.3rem 0.5rem; border-left: 2px solid var(--border); margin-bottom: 0.3rem; }
.affil-list li.current { border-left-color: var(--green); }
.rel-tag { font-size: 0.72rem; color: var(--muted); border: 1px solid var(--border); border-radius: 5px; padding: 0 0.35rem; }
.relations h3 { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--muted); margin: 1rem 0 0.4rem; }

/* ---- Admin editing ---- */
.admin-badge { color: var(--green); font-size: 0.8rem; font-weight: 600; white-space: nowrap; }
.admin-box { margin-top: 1.2rem; padding-top: 0.8rem; border-top: 2px solid var(--border); }
.admin-actions { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.admin-actions .btn { font-size: 0.85rem; padding: 0.4rem 0.6rem; }
.btn.danger { border-color: var(--red); color: var(--red); }
.btn.danger:hover { background: var(--red); color: #fff; }
.rel-row { display: flex; align-items: center; gap: 0.4rem; padding: 0.25rem 0; }
.rel-row .rel-name { flex: 1; color: var(--text); text-decoration: none; cursor: pointer; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rel-row .rel-name:hover { color: var(--accent); text-decoration: underline; }
.rel-type { font: inherit; font-size: 0.8rem; padding: 0.15rem 0.3rem; background: var(--panel-2); border: 1px solid var(--border); border-radius: 6px; color: var(--text); }
.rel-x { border: none; background: none; color: var(--muted); cursor: pointer; font-size: 0.9rem; padding: 0 0.2rem; }
.rel-x:hover { color: var(--red); }
.mini-btn { margin-top: 0.3rem; font: inherit; font-size: 0.8rem; padding: 0.25rem 0.5rem; border: 1px dashed var(--border); border-radius: 6px; background: transparent; color: var(--muted); cursor: pointer; }
.mini-btn:hover { border-color: var(--accent); color: var(--accent); }
.admin-inline { margin-top: 0.7rem; padding: 0.7rem; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; position: relative; }
.admin-inline label { display: block; font-size: 0.82rem; margin-bottom: 0.4rem; }
.admin-inline select { display: block; width: 100%; margin-top: 0.2rem; padding: 0.35rem; background: var(--panel); border: 1px solid var(--border); border-radius: 6px; color: var(--text); font: inherit; }
.ip-host { position: relative; }
.ip-host .inline-search { width: 100%; padding: 0.4rem 0.5rem; background: var(--panel); border: 1px solid var(--border); border-radius: 6px; color: var(--text); font: inherit; }
.ip-host .inline-search:focus { outline: none; border-color: var(--accent); }
.inline-results { left: 0; right: 0; }
.inline-results .create-row { color: var(--accent); font-weight: 600; }
.relations a { display: block; padding: 0.4rem 0.6rem; border-radius: 6px; color: var(--text); text-decoration: none; cursor: pointer; }
.relations a:hover { background: var(--panel-2); }
.relations .none { color: var(--muted); font-size: 0.85rem; }

/* ---- Modal ---- */
.modal {
  position: fixed; inset: 0;
  background: rgba(0, 0, 0, 0.6);
  display: flex; align-items: center; justify-content: center;
  z-index: 100; padding: 1rem;
}
.modal-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  width: 100%; max-width: 560px;
  max-height: 90vh; overflow-y: auto;
  padding: 1.5rem; position: relative;
}
.modal-card h2 { margin-bottom: 0.3rem; }
.modal-close {
  position: absolute; top: 1rem; right: 1rem;
  background: none; border: none; color: var(--muted);
  font-size: 1.1rem; cursor: pointer;
}
.modal-actions { display: flex; justify-content: flex-end; gap: 0.6rem; margin-top: 1rem; }

.tabs { display: flex; gap: 0.4rem; margin: 1rem 0; }
.tab {
  font: inherit; padding: 0.5rem 0.9rem; border-radius: 8px;
  border: 1px solid var(--border); background: var(--panel-2);
  color: var(--muted); cursor: pointer;
}
.tab.active { color: var(--text); border-color: var(--accent); }

.sub-form label { display: block; margin-bottom: 0.7rem; font-size: 0.9rem; }
.sub-form input, .sub-form select, .sub-form textarea {
  display: block; width: 100%; margin-top: 0.25rem;
  padding: 0.5rem 0.6rem; background: var(--panel-2);
  border: 1px solid var(--border); border-radius: 8px; color: var(--text);
  font: inherit;
}
.sub-form input:focus, .sub-form select:focus, .sub-form textarea:focus { outline: none; border-color: var(--accent); }
.row { display: flex; gap: 0.7rem; }
.row label { flex: 1; }
fieldset { border: 1px solid var(--border); border-radius: 8px; margin: 0 0 0.7rem; padding: 0.7rem; }
legend { color: var(--muted); font-size: 0.85rem; padding: 0 0.4rem; }

.person-picker { position: relative; }
.person-picker .picked {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--panel-2); border: 1px solid var(--accent);
  border-radius: 8px; padding: 0.45rem 0.7rem; margin-top: 0.3rem;
}
.person-picker .picked button { background: none; border: none; color: var(--muted); cursor: pointer; }

.form-msg { padding: 0.6rem 0.8rem; border-radius: 8px; margin-top: 0.8rem; font-size: 0.9rem; }
.form-msg.ok { background: rgba(63, 185, 80, 0.15); border: 1px solid var(--green); }
.form-msg.err { background: rgba(248, 81, 73, 0.15); border: 1px solid var(--red); }

@media (max-width: 820px) {
  .side-panel { display: none; }
  .brand h1 { display: none; }
}