:root {
  color-scheme: light;
  --surface-0: #f3f2ef;
  --surface-1: #fcfcfb;
  --surface-2: #ffffff;
  --border: #e3e1dc;
  --border-strong: #cfccc5;
  --text-primary: #0b0b0b;
  --text-secondary: #52514e;
  --text-muted: #85837d;
  --accent: #2a78d6;
  --accent-soft: #e6f0fc;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 4px 16px rgba(0, 0, 0, 0.06);
  --g0: #2a78d6; --g1: #eb6834; --g2: #1baf7a; --g3: #eda100; --g4: #e87ba4;
  --radius: 10px;
  --font: "Noto Sans KR", system-ui, -apple-system, "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --surface-0: #121211;
    --surface-1: #1a1a19;
    --surface-2: #222220;
    --border: #2f2f2c;
    --border-strong: #45453f;
    --text-primary: #f0efec;
    --text-secondary: #c3c2b7;
    --text-muted: #8d8c84;
    --accent: #3987e5;
    --accent-soft: #1d2a3a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.35);
    --g0: #3987e5; --g1: #d95926; --g2: #199e70; --g3: #c98500; --g4: #d55181;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --surface-0: #121211;
  --surface-1: #1a1a19;
  --surface-2: #222220;
  --border: #2f2f2c;
  --border-strong: #45453f;
  --text-primary: #f0efec;
  --text-secondary: #c3c2b7;
  --text-muted: #8d8c84;
  --accent: #3987e5;
  --accent-soft: #1d2a3a;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 6px 20px rgba(0, 0, 0, 0.35);
  --g0: #3987e5; --g1: #d95926; --g2: #199e70; --g3: #c98500; --g4: #d55181;
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--surface-0);
  color: var(--text-primary);
  font: 14px/1.5 var(--font);
  -webkit-font-smoothing: antialiased;
}
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
h1, h2, h3, h4 { margin: 0; font-weight: 700; }

/* ---------- top bar ---------- */
.topbar {
  height: 56px;
  display: flex; align-items: center; gap: 12px;
  padding: 0 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-1);
}
.brand { display: flex; align-items: baseline; gap: 12px; min-width: 0; flex: 1; }
.brand h1 { font-size: 16px; white-space: nowrap; }
.brand .sub { color: var(--text-secondary); font-size: 13px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.btn {
  border: 1px solid var(--border-strong); background: var(--surface-2);
  border-radius: 8px; padding: 6px 12px; font-size: 13px; white-space: nowrap;
}
.btn:hover { border-color: var(--text-muted); }
.btn.icon { width: 34px; height: 34px; padding: 0; display: grid; place-items: center; }
.btn.small { padding: 3px 10px; font-size: 12px; }
.btn.ghost { background: transparent; border-color: transparent; color: var(--text-secondary); }
.btn.ghost:hover { color: var(--text-primary); border-color: var(--border); }

/* ---------- layout ---------- */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  height: calc(100% - 56px);
}
.graph-pane { position: relative; background: var(--surface-1); overflow: hidden; }
#graph { position: absolute; inset: 0; }
.side {
  border-left: 1px solid var(--border);
  background: var(--surface-0);
  overflow-y: auto;
  padding: 16px;
  display: flex; flex-direction: column; gap: 12px;
}

/* ---------- graph overlays ---------- */
.overlay {
  position: absolute; z-index: 5;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.graph-search { top: 12px; left: 12px; width: min(360px, calc(100% - 24px)); }
.graph-search input {
  width: 100%; border: 0; background: transparent; padding: 9px 12px; outline: none;
}
.suggest { list-style: none; margin: 0; padding: 4px; max-height: 280px; overflow-y: auto; }
.suggest:empty { display: none; }
.suggest li {
  padding: 6px 8px; border-radius: 6px; cursor: pointer;
  display: flex; gap: 8px; align-items: baseline;
}
.suggest li:hover, .suggest li.active { background: var(--accent-soft); }
.suggest .s-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.suggest .s-meta { color: var(--text-muted); font-size: 12px; white-space: nowrap; }
.graph-search .suggest { border-top: 1px solid var(--border); }

.legend { left: 12px; bottom: 12px; padding: 10px 12px; font-size: 12px; max-width: calc(100% - 80px); }
.legend-title { color: var(--text-muted); margin-bottom: 4px; }
.legend-row { display: flex; gap: 8px; align-items: center; padding: 1px 0; }
.legend-row b { font-weight: 500; white-space: nowrap; }
.legend-row span { color: var(--text-secondary); }
.legend .key-row { display: flex; gap: 14px; margin-top: 6px; padding-top: 6px; border-top: 1px solid var(--border); color: var(--text-secondary); flex-wrap: wrap; }
.legend .key-row > span { display: inline-flex; align-items: center; gap: 6px; }
.dot { width: 9px; height: 9px; border-radius: 50%; flex: none; display: inline-block; }
.ring { width: 12px; height: 12px; border-radius: 50%; border: 2px solid var(--text-primary); display: inline-block; flex: none; }
.ring.num { width: 16px; height: 16px; font-size: 9px; font-weight: 700; display: inline-grid; place-items: center; }
.legend-toggle { display: none; }

.zoom { right: 12px; bottom: 12px; display: flex; flex-direction: column; padding: 4px; gap: 2px; }
.zoom button { width: 32px; height: 32px; border: 0; background: transparent; border-radius: 6px; font-size: 16px; }
.zoom button:hover { background: var(--accent-soft); }

.cluster-labels { position: absolute; inset: 0; pointer-events: none; z-index: 2; }
.cluster-label {
  position: absolute; transform: translate(-50%, -50%);
  font-size: 12px; font-weight: 700; white-space: nowrap;
  color: var(--text-primary);
  text-shadow: 0 0 3px var(--surface-1), 0 0 3px var(--surface-1), 0 0 6px var(--surface-1);
  transition: opacity .2s;
}

.focus-label {
  position: absolute; white-space: nowrap; font-size: 12px; font-weight: 500; line-height: 20px;
  color: var(--text-primary); padding-right: 4px;
  text-shadow: 0 0 3px var(--surface-1), 0 0 3px var(--surface-1), 0 0 6px var(--surface-1);
}
.focus-label b {
  display: inline-grid; place-items: center; min-width: 18px; height: 18px; margin-right: 5px;
  border-radius: 9px; background: var(--text-primary); color: var(--surface-1);
  font-size: 11px; text-shadow: none; vertical-align: 1px;
}
.focus-label.hist { color: var(--text-secondary); }
.focus-label.hist b { background: var(--surface-1); color: var(--text-primary); border: 1.5px solid var(--text-primary); }
.leader { position: absolute; overflow: visible; }
.leader line { stroke: var(--text-muted); stroke-width: 1; }

.tooltip {
  position: absolute; z-index: 6; pointer-events: none;
  max-width: 300px; padding: 8px 10px; font-size: 12px;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; box-shadow: var(--shadow);
  display: none;
}
.tooltip .t-title { font-weight: 700; font-size: 13px; color: var(--text-primary); margin-bottom: 2px; }
.tooltip .t-meta { color: var(--text-secondary); display: flex; align-items: center; gap: 6px; }

.detail {
  top: 12px; right: 12px; width: min(380px, calc(100% - 24px));
  max-height: calc(100% - 24px); overflow-y: auto; padding: 14px 16px;
  display: none;
}
.detail.open { display: block; }
.detail .d-head { display: flex; gap: 8px; align-items: flex-start; }
.detail .d-head h3 { font-size: 16px; line-height: 1.4; flex: 1; }
.detail .d-meta { color: var(--text-secondary); font-size: 12px; margin: 6px 0 8px; display: flex; align-items: baseline; gap: 6px; }
.detail .d-meta .dot { transform: translateY(1px); }
.detail .d-meta > span:last-child { flex: 1; min-width: 0; }
.detail .d-dek { font-weight: 500; margin: 0 0 8px; }
.detail .d-body p { margin: 0 0 8px; color: var(--text-secondary); }
.detail .d-actions { display: flex; gap: 8px; margin: 10px 0; flex-wrap: wrap; }
.facet-grid { display: grid; grid-template-columns: 84px 1fr; gap: 4px 8px; font-size: 12px; margin: 8px 0 0; }
.facet-grid dt { color: var(--text-muted); padding-top: 1px; }
.facet-grid dd { margin: 0; display: flex; flex-wrap: wrap; gap: 4px; }

.d-sub { font-size: 12px; font-weight: 500; color: var(--text-muted); margin: 14px 0 0; padding-top: 10px; border-top: 1px solid var(--border); }
.raw-grid ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }
.raw-grid li { display: flex; gap: 6px; align-items: baseline; flex-wrap: wrap; }
.raw-grid .raw { color: var(--text-secondary); }
.raw-grid .arrow { color: var(--text-muted); }
.raw-grid .norm { color: var(--text-primary); font-weight: 500; }

.loading {
  position: absolute; inset: 0; z-index: 10; display: grid; place-items: center;
  background: var(--surface-1); color: var(--text-secondary);
}

/* ---------- side panel ---------- */
.card {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
}
.card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; margin-bottom: 10px; }
.card h2 { font-size: 15px; }
.card h3 { font-size: 12px; color: var(--text-muted); font-weight: 500; margin: 12px 0 6px; }
.hint { color: var(--text-muted); font-size: 12px; margin: 0; }
.count { color: var(--text-muted); font-size: 12px; font-weight: 400; }

.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--border-strong); background: var(--surface-2);
  border-radius: 999px; padding: 3px 10px; font-size: 12px; line-height: 1.6;
}
button.chip:hover { border-color: var(--text-muted); }
.chip[aria-pressed="true"] { background: var(--text-primary); color: var(--surface-2); border-color: var(--text-primary); }
.chip .x { color: inherit; opacity: .6; border: 0; background: none; padding: 0; font-size: 13px; line-height: 1; }
.chip.tag { background: var(--surface-0); border-color: transparent; color: var(--text-secondary); padding: 1px 8px; }
.chip.tag b { font-weight: 500; color: var(--text-muted); }
.chip.tag.hit { background: var(--accent-soft); color: var(--text-primary); }
.cat-group { margin-bottom: 8px; }
.cat-group-name { font-size: 12px; color: var(--text-muted); display: flex; align-items: center; gap: 6px; margin-bottom: 4px; }

.field { position: relative; }
.field input {
  width: 100%; padding: 8px 10px; border-radius: 8px;
  border: 1px solid var(--border-strong); background: var(--surface-1); outline: none;
}
.field input:focus { border-color: var(--accent); }
.field .suggest {
  position: absolute; left: 0; right: 0; top: calc(100% + 4px); z-index: 20;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; box-shadow: var(--shadow);
}
.via { color: var(--text-muted); font-size: 12px; }

.presets { display: flex; flex-wrap: wrap; gap: 6px; }

.history { list-style: none; margin: 8px 0 0; padding: 0; }
.history li {
  display: flex; align-items: center; gap: 8px; padding: 6px 0; border-top: 1px solid var(--border);
  font-size: 13px;
}
.history li:first-child { border-top: 0; }
.history .h-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; cursor: pointer; }
.history .h-title:hover { text-decoration: underline; }
.history .h-cat { color: var(--text-muted); font-size: 12px; white-space: nowrap; }
.history .x { border: 0; background: none; color: var(--text-muted); font-size: 15px; padding: 0 2px; }
.history .x:hover { color: var(--text-primary); }
.empty { color: var(--text-muted); font-size: 13px; padding: 6px 0; }

.cta { display: flex; flex-direction: column; gap: 6px; }
.cta .hint { text-align: center; }
.btn-primary {
  width: 100%; padding: 14px 16px; border: 0; border-radius: var(--radius);
  background: var(--accent); color: #fff; font-size: 17px; font-weight: 700; letter-spacing: 0.02em;
  box-shadow: var(--shadow); transition: filter .15s, transform .05s;
}
.btn-primary:hover:not(:disabled) { filter: brightness(1.08); }
.btn-primary:active:not(:disabled) { transform: translateY(1px); }
.btn-primary:disabled { opacity: 0.4; cursor: not-allowed; box-shadow: none; }
.btn-primary:focus-visible { outline: 2px solid var(--text-primary); outline-offset: 2px; }

.recs { display: flex; flex-direction: column; gap: 8px; }
.rec {
  display: grid; grid-template-columns: 26px 1fr; gap: 0 10px;
  padding: 10px 10px 10px 8px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface-1); cursor: pointer; text-align: left; width: 100%;
}
.rec:hover { border-color: var(--border-strong); }
.rec .rank {
  width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center;
  font-size: 12px; font-weight: 700; border: 2px solid var(--text-primary); margin-top: 1px;
}
.rec .r-title { font-weight: 700; font-size: 14px; line-height: 1.4; }
.rec .r-meta { color: var(--text-muted); font-size: 12px; margin: 2px 0 4px; display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.rec .r-dek { color: var(--text-secondary); font-size: 13px; margin-bottom: 6px; }
.why { font-size: 12px; color: var(--text-secondary); display: flex; flex-direction: column; gap: 4px; }
.why .chips { gap: 4px; }
.why q { quotes: "「" "」"; }
.meters { display: grid; grid-template-columns: auto 1fr 30px; gap: 3px 8px; align-items: center; font-size: 11px; color: var(--text-muted); margin-top: 8px; }
.meters output { text-align: right; font-variant-numeric: tabular-nums; }
.meter { height: 4px; border-radius: 2px; background: var(--surface-0); overflow: hidden; }
.meter i { display: block; height: 100%; background: var(--text-secondary); border-radius: 2px; }

details.tuning { margin-top: 12px; border-top: 1px solid var(--border); padding-top: 10px; }
details.tuning summary { cursor: pointer; color: var(--text-secondary); font-size: 13px; }
.slider { display: grid; grid-template-columns: 120px 1fr 36px; align-items: center; gap: 8px; font-size: 12px; margin-top: 8px; color: var(--text-secondary); }
.slider input { width: 100%; accent-color: var(--accent); }
.slider output { text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- how-it-works dialog ---------- */
dialog {
  border: 1px solid var(--border); border-radius: 14px; padding: 0;
  background: var(--surface-2); color: var(--text-primary);
  width: min(760px, calc(100% - 32px)); max-height: calc(100% - 48px);
  box-shadow: var(--shadow);
}
dialog::backdrop { background: rgba(0, 0, 0, 0.45); }
.dlg { padding: 20px 24px 24px; }
.dlg-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; }
.dlg h2 { font-size: 18px; }
.dlg .lead { color: var(--text-secondary); margin: 4px 0 16px; }
.dlg .phase { font-size: 15px; margin: 20px 0 10px; padding-top: 14px; border-top: 1px solid var(--border); display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.dlg .phase span { font-size: 12px; font-weight: 400; color: var(--text-muted); }
.steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.steps li { display: grid; grid-template-columns: 28px 1fr; gap: 10px; }
.steps .n { width: 24px; height: 24px; border-radius: 50%; border: 2px solid var(--text-primary); display: grid; place-items: center; font-size: 12px; font-weight: 700; }
.steps h4 { margin: 2px 0 2px; font-size: 14px; }
.steps p { margin: 0; color: var(--text-secondary); font-size: 13px; }
.stat-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin: 16px 0 4px; }
.stat { background: var(--surface-0); border-radius: 8px; padding: 10px 12px; }
.stat b { display: block; font-size: 20px; font-variant-numeric: tabular-nums; }
.stat span { color: var(--text-muted); font-size: 12px; }
.note { margin-top: 14px; font-size: 12px; color: var(--text-muted); }
code { font-size: 12px; background: var(--surface-0); padding: 1px 5px; border-radius: 4px; }

/* ---------- small screens ---------- */
@media (max-width: 960px) {
  .topbar { height: auto; min-height: 56px; padding: 8px 16px; }
  .brand { flex-direction: column; gap: 0; }
  .brand .sub { white-space: normal; font-size: 12px; }
  .layout { display: block; height: auto; }
  .graph-pane { height: 62vh; min-height: 380px; }
  .side { border-left: 0; overflow: visible; padding: 12px 16px 24px; }
  .legend { display: none; }
  .legend.open { display: block; bottom: 56px; }
  .legend-toggle { display: block; position: absolute; left: 12px; bottom: 12px; z-index: 5; }
  .detail { top: auto; bottom: 12px; max-height: 70%; }
  .stat-row { grid-template-columns: repeat(2, 1fr); }
}