:root {
  --ink: #17201d;
  --muted: #6c7873;
  --line: #dce3df;
  --paper: #f7f9f8;
  --panel: #fff;
  --green: #13795b;
  --green-soft: #e8f4ef;
  --red: #bf3f4f;
  --red-soft: #fbecee;
  --amber: #a76610;
  --blue: #296d98;
  --shadow: 0 14px 35px rgba(27, 48, 40, .08);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  letter-spacing: 0;
}
button, input, select { font: inherit; }
button { cursor: pointer; }
.hidden { display: none !important; }

.topbar {
  height: 68px;
  padding: 0 max(24px, calc((100vw - 1500px) / 2));
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: rgba(255,255,255,.94);
}
.brand {
  color: inherit;
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.brand-mark {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--ink);
  border-radius: 6px;
  font-weight: 800;
}
.brand strong, .brand small { display: block; }
.brand small { margin-top: 2px; color: var(--muted); font-size: 12px; }
.source-state { display: flex; align-items: center; gap: 8px; color: var(--muted); font-size: 13px; }
.pulse { width: 8px; height: 8px; border-radius: 50%; background: #9ba6a1; }
.source-state.ready .pulse { background: var(--green); box-shadow: 0 0 0 5px var(--green-soft); }

main { max-width: 1500px; margin: 0 auto; padding: 28px 24px 56px; }
.search-band {
  display: flex;
  justify-content: space-between;
  gap: 40px;
  align-items: end;
  padding: 18px 4px 30px;
}
.eyebrow { margin: 0 0 7px; color: var(--green); font-size: 11px; font-weight: 800; letter-spacing: 1.2px; }
h1 { margin: 0; font-size: clamp(34px, 4vw, 56px); line-height: 1.05; letter-spacing: 0; }
.search-band > div > p:last-child { max-width: 640px; margin: 12px 0 0; color: var(--muted); }
.symbol-search { width: min(620px, 48vw); min-width: 500px; }
.symbol-search label { display: block; margin-bottom: 7px; color: var(--muted); font-size: 12px; font-weight: 700; }
.symbol-search > div { display: flex; }
.symbol-search input {
  width: 170px;
  height: 48px;
  padding: 0 15px;
  border: 1px solid var(--line);
  border-right: 0;
  border-radius: 6px 0 0 6px;
  background: #fff;
  text-transform: uppercase;
  font-size: 18px;
  font-weight: 800;
  outline: none;
}
.symbol-search input:focus { border-color: var(--green); box-shadow: inset 0 0 0 1px var(--green); }
.symbol-search button {
  height: 48px;
  padding: 0 20px;
  border: 0;
  border-radius: 0 6px 6px 0;
  color: #fff;
  background: var(--ink);
  font-weight: 750;
}
.symbol-search > span { display: block; margin-top: 7px; color: var(--muted); font-size: 12px; }
.symbol-presets { display: grid; gap: 6px; margin-top: 10px; }
.symbol-presets > div { display: flex; flex-wrap: wrap; align-items: center; gap: 5px; }
.symbol-presets span { width: 62px; margin: 0; color: var(--muted); font-size: 11px; font-weight: 700; }
.symbol-presets button {
  height: 27px;
  padding: 0 9px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fff;
  color: #53605b;
  font-size: 11px;
  font-weight: 800;
}
.symbol-presets button:hover { border-color: var(--green); color: var(--green); background: var(--green-soft); }
.symbol-presets button.active { border-color: var(--ink); color: #fff; background: var(--ink); }

.error-panel {
  margin-bottom: 16px;
  padding: 14px 16px;
  display: flex;
  gap: 12px;
  align-items: center;
  border: 1px solid #edc5ca;
  border-radius: 6px;
  background: var(--red-soft);
  color: #752934;
}
.error-panel span { flex: 1; }
.error-panel button { border: 0; background: transparent; color: inherit; font-weight: 800; }

.workspace { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 18px; align-items: start; }
.workspace.loading { opacity: .52; pointer-events: none; }
.contract-panel, .quote-strip, .chart-panel, .greeks-panel, .decision-panel, .table-panel {
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--panel);
  box-shadow: var(--shadow);
}
.contract-panel { padding: 18px; position: sticky; top: 18px; }
.panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.panel-heading h2 { margin: 0; font-size: 19px; }
.icon-button {
  width: 36px; height: 36px; border: 1px solid var(--line); border-radius: 6px; background: #fff; font-size: 20px;
}
.field { display: grid; gap: 7px; margin-top: 20px; }
.field span, .chain-toolbar, .quote-strip span, .scenario-row span, .unit { color: var(--muted); font-size: 12px; font-weight: 700; }
.field select { height: 42px; padding: 0 10px; border: 1px solid var(--line); border-radius: 5px; background: #fff; }
.segmented { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; margin-top: 12px; padding: 4px; border-radius: 6px; background: #edf1ef; }
.segmented button { min-height: 38px; border: 0; border-radius: 4px; background: transparent; color: var(--muted); font-weight: 750; }
.segmented button.active { background: #fff; color: var(--ink); box-shadow: 0 1px 5px rgba(0,0,0,.08); }
.chain-toolbar { display: flex; justify-content: space-between; margin: 20px 0 8px; }
.chain-head, .chain-row { display: grid; grid-template-columns: 1.2fr .85fr .85fr .8fr; gap: 5px; align-items: center; }
.chain-head { padding: 0 9px 7px; color: #8a9590; font-size: 10px; text-align: right; }
.chain-head span:first-child { text-align: left; }
.chain-list { height: 410px; overflow: auto; border: 1px solid var(--line); border-radius: 5px; }
.chain-row {
  width: 100%;
  min-height: 42px;
  padding: 0 9px;
  border: 0;
  border-bottom: 1px solid #edf0ee;
  background: #fff;
  text-align: right;
  font-size: 12px;
}
.chain-row span:first-child { text-align: left; font-weight: 800; }
.chain-row:hover { background: #f3f7f5; }
.chain-row.active { background: var(--green-soft); box-shadow: inset 3px 0 var(--green); }

.analysis { width: 100%; min-width: 0; max-width: 100%; display: grid; gap: 18px; }
.analysis > * { min-width: 0; max-width: 100%; }
.quote-strip { padding: 14px; display: grid; grid-template-columns: 1.2fr repeat(4, 1fr); gap: 1px; }
.quote-strip > div { min-width: 0; padding: 8px 16px; border-left: 1px solid var(--line); }
.quote-strip > div:first-child { border-left: 0; }
.quote-strip strong { display: block; margin-top: 6px; font-size: 22px; }
.quote-strip small { display: block; margin-top: 5px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.underlying-card { display: flex; justify-content: space-between; align-items: center; }
.underlying-card p { margin: 0; color: var(--muted); font-weight: 800; }
.underlying-card > span { padding: 5px 7px; border-radius: 4px; background: #eef2f0; }
.positive { color: var(--green) !important; }
.negative { color: var(--red) !important; }

.chart-panel, .greeks-panel, .decision-panel, .table-panel { padding: 20px; }
.legend { display: flex; gap: 16px; font-size: 12px; }
.legend span::before { content: ""; display: inline-block; width: 18px; height: 3px; margin-right: 6px; vertical-align: middle; }
.legend .profit::before { background: var(--green); }
.legend .loss::before { background: var(--red); }
.chart-wrap { position: relative; width: 100%; min-width: 0; max-width: 100%; height: 360px; margin-top: 16px; border: 1px solid var(--line); border-radius: 5px; overflow: hidden; }
#payoffCanvas { width: 100%; max-width: 100%; min-width: 0; height: 100%; display: block; }
.chart-tooltip { position: absolute; z-index: 2; padding: 7px 9px; border-radius: 4px; background: var(--ink); color: #fff; font-size: 11px; pointer-events: none; }
.scenario-row { display: grid; grid-template-columns: minmax(280px, 2fr) 1fr 1fr; align-items: center; gap: 20px; padding-top: 16px; }
.scenario-row label { display: grid; grid-template-columns: auto 1fr auto; gap: 12px; align-items: center; }
.scenario-row input { width: 100%; accent-color: var(--green); }
.scenario-row > div { display: flex; align-items: center; justify-content: space-between; padding-left: 20px; border-left: 1px solid var(--line); }

.detail-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 18px; }
.greeks-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 16px; }
.greeks-grid > div { padding: 15px; border: 1px solid var(--line); border-radius: 5px; background: #fbfcfb; }
.greeks-grid span { color: var(--muted); font-size: 12px; font-weight: 700; }
.greeks-grid strong { display: block; margin: 7px 0 4px; font-size: 21px; }
.greeks-grid small { color: var(--muted); }
.decision-list { display: grid; gap: 9px; margin-top: 16px; }
.decision-item { padding: 12px; display: grid; grid-template-columns: 10px 1fr; gap: 10px; border: 1px solid var(--line); border-radius: 5px; }
.decision-item i { width: 8px; height: 8px; margin-top: 5px; border-radius: 50%; background: var(--green); }
.decision-item.warn i { background: var(--amber); }
.decision-item.bad i { background: var(--red); }
.decision-item strong, .decision-item small { display: block; }
.decision-item small { margin-top: 3px; color: var(--muted); }

.contract-id { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }
.table-scroll { overflow: auto; margin: 15px -20px -20px; }
table { width: 100%; border-collapse: collapse; font-size: 12px; }
th, td { padding: 11px 14px; border-top: 1px solid var(--line); text-align: right; white-space: nowrap; }
th { color: var(--muted); background: #f7f9f8; font-size: 10px; text-transform: uppercase; }
th:first-child, td:first-child { text-align: left; }
tr.selected { background: var(--green-soft); }

footer {
  max-width: 1500px;
  margin: 0 auto;
  padding: 20px 24px 40px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  font-size: 12px;
}

@media (max-width: 1050px) {
  .workspace { grid-template-columns: 1fr; }
  .contract-panel { position: static; }
  .chain-list { height: 250px; }
  .quote-strip { grid-template-columns: repeat(2, 1fr); }
  .quote-strip > div { border-left: 0; border-top: 1px solid var(--line); }
  .quote-strip > div:first-child { grid-column: 1 / -1; border-top: 0; }
}
@media (max-width: 720px) {
  main { padding: 16px 12px 36px; }
  .topbar { padding: 0 14px; }
  .source-state { display: none; }
  .search-band { display: grid; gap: 22px; }
  .symbol-search { min-width: 0; }
  .symbol-search { width: 100%; }
  .symbol-presets span { width: 100%; margin-top: 3px; }
  .symbol-search input { flex: 1; width: auto; min-width: 0; }
  .analysis { overflow: hidden; }
  .quote-strip, .detail-grid, .scenario-row { grid-template-columns: minmax(0, 1fr); }
  .quote-strip > div:first-child { grid-column: auto; }
  .scenario-row > div { border-left: 0; border-top: 1px solid var(--line); padding: 12px 0 0; }
  .greeks-grid { grid-template-columns: 1fr; }
  .chart-wrap { height: 300px; }
  footer { display: grid; padding-inline: 14px; }
}