/* styles.css — synthetic-control ladder lab.
   Dark navy site palette; no external fonts or assets. */

:root {
  --bg:        #0f1729;
  --panel:     #16203a;
  --border:    #1f2b5e;
  --text:      #e8ecf2;
  --dim:       #c8d0e0;
  --muted:     #8b9dc3;
  --steel:     #6a9bcc;
  --orange:    #d97757;
  --teal:      #00d4c8;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0 1rem 4rem;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  font-size: 16px;
}

main { max-width: 980px; margin: 0 auto; }

/* ---- hero ---- */
.hero {
  max-width: 980px;
  margin: 0 auto;
  padding: 3rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
}
.eyebrow {
  margin: 0 0 .4rem;
  color: var(--teal);
  font-size: .78rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.hero h1 {
  margin: 0 0 .8rem;
  font-size: clamp(1.7rem, 4.4vw, 2.5rem);
  line-height: 1.2;
  font-weight: 650;
}
.lede {
  margin: 0;
  max-width: 62ch;
  color: var(--dim);
  font-size: 1.03rem;
}

/* ---- panels ---- */
.panel {
  margin: 2.2rem 0;
  padding: 1.4rem 1.4rem 1.6rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
}
.panel-head h2 {
  margin: 0 0 .35rem;
  font-size: 1.16rem;
  font-weight: 620;
}
.panel-head p {
  margin: 0 0 1rem;
  max-width: 68ch;
  color: var(--muted);
  font-size: .93rem;
}

/* ---- controls ---- */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.1rem;
}
.pill {
  padding: .42rem .9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: transparent;
  color: var(--dim);
  font-size: .87rem;
  font-family: inherit;
  cursor: pointer;
  transition: background .14s, color .14s, border-color .14s;
}
.pill:hover { border-color: var(--steel); color: var(--text); }
.pill.active {
  background: var(--steel);
  border-color: var(--steel);
  color: #0f1729;
  font-weight: 600;
}
.pill:focus-visible { outline: 2px solid var(--teal); outline-offset: 2px; }

/* ---- charts ---- */
.chart-wrap {
  width: 100%;
  overflow-x: auto;
  margin: .4rem 0 .2rem;
}
.chart-wrap svg { width: 100%; height: auto; display: block; min-width: 520px; }

/* ---- readout ---- */
.readout {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem 2.4rem;
  align-items: baseline;
  margin: 1rem 0 .4rem;
  padding: 1rem 1.1rem;
  background: rgba(106, 155, 204, 0.08);
  border-left: 3px solid var(--steel);
  border-radius: 4px;
}
.stat { display: flex; flex-direction: column; }
.stat .num {
  font-size: 1.7rem;
  font-weight: 650;
  line-height: 1.1;
  color: var(--text);
  font-variant-numeric: tabular-nums;
}
.stat .lab {
  font-size: .8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.blurb {
  flex-basis: 100%;
  margin: .2rem 0 0;
  max-width: 72ch;
  color: var(--dim);
  font-size: .92rem;
}

.note {
  margin: .9rem 0 0;
  max-width: 74ch;
  color: var(--dim);
  font-size: .92rem;
  border-left: 3px solid var(--teal);
  padding-left: .9rem;
}

.error {
  padding: 1rem;
  border: 1px solid var(--orange);
  border-radius: 8px;
  color: var(--orange);
}

/* ---- tooltip ---- */
.tooltip {
  position: absolute;
  pointer-events: none;
  opacity: 0;
  z-index: 20;
  padding: .5rem .7rem;
  background: rgba(15, 23, 41, 0.97);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: .84rem;
  line-height: 1.45;
  box-shadow: 0 6px 20px rgba(0, 0, 0, .45);
  transition: opacity .12s;
}
.tooltip .dim { color: var(--muted); }

/* ---- footer ---- */
footer {
  max-width: 980px;
  margin: 3rem auto 0;
  padding-top: 1.4rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: .88rem;
}
footer a { color: var(--steel); }
footer .cite { font-size: .82rem; margin-top: .6rem; }
code {
  padding: .1em .35em;
  background: rgba(232, 236, 242, 0.08);
  border-radius: 3px;
  font-size: .9em;
}

@media (max-width: 640px) {
  .panel { padding: 1.1rem .9rem 1.2rem; }
  .readout { gap: 1rem 1.4rem; }
  .stat .num { font-size: 1.4rem; }
}