/* Forecast Studio: a light, chart-first analyst workspace. Ink for history, vermilion for the future. */
:root {
  color-scheme: light;
  --bg: #f3f4f6;
  --card: #ffffff;
  --ink: #0f1115;
  --muted: #5d6470;
  --faint: #979eaa;
  --line: #e3e6eb;
  --line-strong: #cdd2da;
  --accent: #ff4f1f;
  --accent-soft: rgba(255, 79, 31, .13);
  --backtest: #2f5bff;
  --holdout: #edf0f7;
  --sans: "Instrument Sans", system-ui, sans-serif;
  --mono: "DM Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.55 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }
code { font: 13px var(--mono); background: var(--holdout); padding: 1px 5px; border-radius: 4px; }

/* Top bar */
.topbar { height: 64px; display: flex; align-items: center; justify-content: space-between; padding: 0 clamp(16px, 3vw, 40px); background: var(--card); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 17px; letter-spacing: -.02em; }
.brand-mark { width: 28px; height: 28px; }
.brand-mark rect { fill: var(--ink); }
.brand-mark path { fill: none; stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; }
.brand-mark .observed { stroke: #fff; }
.brand-mark .projected { stroke: var(--accent); stroke-dasharray: 1 3.4; }
.topbar nav { display: flex; gap: 22px; font-size: 14px; color: var(--muted); }
.topbar nav a:hover { color: var(--accent); }

main { width: min(1280px, 100% - 32px); margin: 0 auto; padding: 44px 0 20px; }

/* Hero */
.hero { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: end; margin-bottom: 32px; }
.eyebrow { margin: 0 0 14px; font: 500 12px var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--accent); }
.hero h1 { margin: 0; font-size: clamp(38px, 5.2vw, 68px); line-height: .98; letter-spacing: -.045em; font-weight: 600; text-wrap: balance; }
.lede { margin: 0; color: var(--muted); font-size: 16px; max-width: 460px; justify-self: end; }

/* Toolbar */
.toolbar { display: grid; grid-template-columns: minmax(360px, 1.5fr) auto minmax(160px, .8fr) auto; gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; }
.field { background: var(--card); padding: 14px 18px 16px; display: flex; flex-direction: column; gap: 9px; min-width: 0; }
.field-label { display: flex; justify-content: space-between; gap: 10px; font: 500 11px var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--muted); }
.field-label output { color: var(--ink); }
.field-row { display: flex; gap: 8px; }
select { flex: 1; min-width: 0; height: 38px; padding: 0 34px 0 12px; border: 1px solid var(--line-strong); border-radius: 9px; background: var(--card) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5l3 3 3-3' fill='none' stroke='%235d6470' stroke-width='1.5'/%3E%3C/svg%3E") no-repeat right 11px center / 12px; appearance: none; font-size: 14px; }
.btn { height: 38px; padding: 0 14px; border: 1px solid var(--line-strong); border-radius: 9px; background: var(--card); font-size: 14px; font-weight: 500; white-space: nowrap; transition: border-color .15s, background .15s; }
.btn:hover { border-color: var(--ink); background: #fafafa; }
.segmented { display: flex; height: 38px; padding: 3px; gap: 2px; background: var(--bg); border: 1px solid var(--line); border-radius: 10px; }
.segmented button { white-space: nowrap; padding: 0 14px; border: 0; border-radius: 7px; background: transparent; font-size: 14px; font-weight: 500; color: var(--muted); transition: background .15s, color .15s; }
.segmented button:hover { color: var(--ink); }
.segmented button[aria-checked="true"] { background: var(--ink); color: #fff; }
.field-horizon input { width: 100%; height: 38px; margin: 0; accent-color: var(--accent); }
.status { min-height: 22px; margin: 10px 2px 0; font: 12.5px var(--mono); color: var(--muted); }
.status.error { color: #c42b0b; }

/* KPIs */
.kpis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; margin-top: 8px; }
.kpi { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; display: flex; flex-direction: column; }
.kpi span { font: 500 11px var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--muted); }
.kpi strong { margin-top: 14px; font-size: clamp(30px, 3.2vw, 44px); line-height: 1; font-weight: 600; letter-spacing: -.04em; font-variant-numeric: tabular-nums; }
.kpi small { margin-top: 8px; font-size: 13px; color: var(--faint); }
.kpi small.up { color: #0e8a55; }
.kpi small.down { color: #c42b0b; }
.kpi:first-child strong { color: var(--accent); }

/* Chart */
.chart-card { margin-top: 14px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 20px 22px 16px; }
.chart-head { display: flex; align-items: center; gap: 24px; }
.chart-head h2 { margin: 0 0 3px; font-size: 20px; font-weight: 600; letter-spacing: -.02em; }
.meta { font: 11.5px var(--mono); letter-spacing: .05em; color: var(--faint); text-transform: uppercase; }
.legend { list-style: none; margin: 0 0 0 auto; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 13px; color: var(--muted); }
.legend li { display: flex; align-items: center; gap: 7px; }
.key { display: inline-block; width: 18px; height: 3px; border-radius: 2px; }
.key.observed { background: var(--ink); }
.key.average { background: #8a93a2; height: 4px; }
.key.backtest { background: repeating-linear-gradient(90deg, var(--backtest) 0 5px, transparent 5px 8px); }
.key.forecast { background: var(--accent); }
.key.band { height: 11px; background: var(--accent-soft); }
.key.holdout { height: 11px; background: var(--holdout); border: 1px solid var(--line-strong); }

.chart-note { margin: 14px 0 0; padding: 10px 14px; border-left: 3px solid var(--accent); background: var(--bg); border-radius: 0 8px 8px 0; font-size: 14px; color: var(--ink); }
.chart-wrap { position: relative; margin-top: 18px; }
.chart { min-height: 260px; touch-action: pan-y; }
.chart svg { display: block; width: 100%; overflow: visible; }
.chart text { font: 11px var(--mono); fill: var(--faint); }
.chart .grid line { stroke: var(--line); }
.chart .holdout-zone { fill: var(--holdout); }
.chart .zone-label { font-size: 10px; letter-spacing: .08em; fill: var(--muted); }
.chart .area { fill: url(#observedFill); }
.chart .observed { fill: none; stroke: var(--ink); stroke-width: 2; stroke-linejoin: round; }
.chart .average { fill: none; stroke: #8a93a2; stroke-width: 3; stroke-linejoin: round; stroke-linecap: round; opacity: .95; }
.chart .backtest { fill: none; stroke: var(--backtest); stroke-width: 1.8; stroke-dasharray: 5 4; }
.chart .band { fill: var(--accent-soft); }
.chart .forecast { fill: none; stroke: var(--accent); stroke-width: 2.6; stroke-linejoin: round; }
.chart .now { stroke: var(--ink); stroke-dasharray: 2 4; opacity: .5; }
.chart .now-label { fill: var(--ink); font-weight: 500; }
.chart .end-dot { fill: var(--accent); stroke: #fff; stroke-width: 2.5; }
.chart .end-label { fill: var(--accent); font-weight: 500; font-size: 12px; }
.chart .cursor { stroke: var(--ink); opacity: .25; }
.chart .cursor-dot { stroke: #fff; stroke-width: 2; }
.chart .draw { animation: draw 1.1s cubic-bezier(.3, .7, .2, 1) both; }
.chart .fade { animation: fade .6s .5s both; }

.tooltip { position: absolute; top: 0; z-index: 2; min-width: 170px; padding: 10px 12px; background: var(--ink); color: #fff; border-radius: 10px; font-size: 13px; pointer-events: none; box-shadow: 0 10px 30px rgba(15, 17, 21, .18); }
.tooltip b { display: block; margin-bottom: 6px; font: 500 11px var(--mono); letter-spacing: .05em; color: #aab0bb; text-transform: uppercase; }
.tooltip div { display: flex; justify-content: space-between; gap: 16px; }
.tooltip span { display: flex; align-items: center; gap: 6px; color: #d4d8de; }
.tooltip i { width: 8px; height: 8px; border-radius: 50%; }
.tooltip em { font-style: normal; font-variant-numeric: tabular-nums; font-weight: 600; }

.chart-foot { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line); }
.tuning { margin-top: 14px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: #fafbfc; }
.tuning-head { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.segmented.compact { height: 32px; }
.segmented.compact button { padding: 0 11px; font-size: 13px; }
.tuning-score { margin-left: auto; font: 500 12px var(--mono); color: var(--muted); }
.tuning-score b { color: var(--ink); font-weight: 500; }
.tuning-sliders { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px 26px; margin-top: 12px; }
.tuning-sliders label { display: grid; grid-template-columns: auto 1fr 38px; align-items: center; gap: 10px; font-size: 13px; font-weight: 500; }
.tuning-sliders span { white-space: nowrap; }
.tuning-sliders em { font-style: normal; color: var(--faint); }
.tuning-sliders input { width: 100%; accent-color: var(--backtest); }
.tuning-sliders output { font: 500 12px var(--mono); text-align: right; font-variant-numeric: tabular-nums; }
.tuning-help { margin: 10px 0 0; font-size: 12.5px; color: var(--faint); }
.tuning.is-disabled .tuning-sliders, .tuning.is-disabled .segmented { opacity: .45; pointer-events: none; }
.source { margin: 10px 0 0; font-size: 12.5px; color: var(--faint); }
.source a { color: var(--muted); text-decoration: underline; text-underline-offset: 3px; }
.source a:hover { color: var(--accent); }
.model-tag { font: 500 12px var(--mono); padding: 4px 9px; border-radius: 6px; background: var(--accent-soft); color: #c2360f; }

/* Lower row */
.lower { display: grid; grid-template-columns: 1.1fr 1fr; gap: 14px; margin-top: 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 20px 22px; }
.card-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; margin-bottom: 14px; }
.card h2 { margin: 0; font-size: 17px; font-weight: 600; letter-spacing: -.015em; }

.leaderboard { list-style: none; margin: 0; padding: 0; }
.leaderboard li { border-top: 1px solid var(--line); }
.leaderboard button { width: 100%; display: grid; grid-template-columns: 22px minmax(0, 1.6fr) minmax(60px, .8fr) 72px 72px; align-items: center; gap: 14px; padding: 11px 6px; border: 0; background: transparent; text-align: left; border-radius: 8px; transition: background .15s; }
.leaderboard button:hover { background: var(--bg); }
.leaderboard .rank { font: 500 12px var(--mono); color: var(--faint); }
.leaderboard .name { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.leaderboard .title { font-weight: 500; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.leaderboard .about { font-size: 12px; line-height: 1.4; color: var(--faint); }
.leaderboard .badge { font: 500 10.5px var(--mono); letter-spacing: .04em; padding: 2px 6px; border-radius: 5px; background: var(--bg); color: var(--muted); text-transform: uppercase; }
.leaderboard .selected .badge { background: var(--accent-soft); color: #c2360f; }
.leaderboard .bar { height: 6px; border-radius: 6px; background: var(--bg); overflow: hidden; }
.leaderboard .bar i { display: block; height: 100%; border-radius: 6px; background: var(--line-strong); transform-origin: left; animation: grow .7s cubic-bezier(.3, .7, .2, 1) both; }
.leaderboard .selected .bar i { background: var(--accent); }
.leaderboard .num { font: 13px var(--mono); text-align: right; font-variant-numeric: tabular-nums; }
.leaderboard .num small { display: block; font-size: 10px; color: var(--faint); letter-spacing: .05em; }
.leaderboard-foot { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 10px; }
.hint { margin: 0; font-size: 12.5px; color: var(--faint); }
#show-all { height: 32px; font-size: 13px; }

.insight { margin: 0; font-size: 16px; line-height: 1.6; }
.insight b { font-weight: 600; }
details { margin-top: 16px; border-top: 1px solid var(--line); padding-top: 14px; }
summary { cursor: pointer; font-size: 14px; font-weight: 500; }
details p { margin: 10px 0 0; font-size: 14px; color: var(--muted); }
.byo { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-top: 16px; padding: 14px 16px; background: var(--bg); border-radius: 12px; }
.byo p { margin: 0; font-size: 13.5px; color: var(--muted); }
.byo b { color: var(--ink); font-weight: 600; }

.footer { width: min(1280px, 100% - 32px); margin: 40px auto 0; padding: 22px 0 36px; border-top: 1px solid var(--line-strong); display: flex; justify-content: space-between; gap: 16px; font-size: 13px; color: var(--muted); }
.footer a:hover { color: var(--accent); }

@keyframes draw { from { clip-path: inset(0 100% 0 0); } to { clip-path: inset(0 0 0 0); } }
@keyframes fade { from { opacity: 0; } }
@keyframes grow { from { transform: scaleX(0); } }

@media (max-width: 1100px) {
  .toolbar { grid-template-columns: 1fr 1fr; }
  .chart-head { flex-wrap: wrap; }
  .legend { order: 3; width: 100%; margin: 0; }
  #export { margin-left: auto; }
  .lower { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  main { padding-top: 28px; }
  .hero { grid-template-columns: 1fr; gap: 14px; }
  .lede { justify-self: start; font-size: 15px; }
  .toolbar { grid-template-columns: 1fr; }
  .segmented { height: auto; flex-wrap: wrap; }
  .segmented button { flex: 1 0 auto; min-height: 32px; padding: 0 10px; }
  .tuning .segmented { flex-wrap: nowrap; }
  .kpis { grid-template-columns: 1fr 1fr; gap: 10px; }
  .kpi { padding: 14px 16px; }
  .chart-card, .card { padding: 16px; border-radius: 14px; }
  .leaderboard button { grid-template-columns: 18px minmax(0, 1fr) 62px 62px; gap: 10px; }
  .leaderboard-foot { flex-direction: column; align-items: flex-start; }
  .leaderboard .bar { display: none; }
  .tuning-sliders { grid-template-columns: 1fr; }
  .tuning-score { margin-left: 0; width: 100%; }
  .byo { flex-direction: column; align-items: flex-start; }
  .footer { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}