:root,
:root[data-theme="dark"] {
  --bg: #07090d;
  --bg-grid: radial-gradient(circle at 10% 0%, rgba(79,178,255,.10), transparent 38%), radial-gradient(circle at 88% 6%, rgba(47,227,171,.06), transparent 36%);
  --surface: #10141b;
  --surface-2: #141924;
  --surface-soft: #171d29;
  --text: #eef2f8;
  --muted: #8993a4;
  --slate: #aab3c4;
  --border: rgba(255,255,255,.08);
  --border-strong: rgba(255,255,255,.16);
  --accent: #4fb2ff;
  --accent-2: #7c9bff;
  --accent-soft: rgba(79,178,255,.14);
  --green: #2fe3ab;
  --green-soft: rgba(47,227,171,.12);
  --red: #ff5d76;
  --red-soft: rgba(255,93,118,.13);
  --orange: #ffb648;
  --orange-soft: rgba(255,182,72,.13);
  --shadow: 0 24px 60px rgba(0,0,0,.45);
  --chart-grid: rgba(255,255,255,.07);
  --chart-zero: rgba(255,255,255,.24);
}

:root[data-theme="light"] {
  --bg: #f3f5f9;
  --bg-grid: radial-gradient(circle at 10% 0%, rgba(47,111,237,.06), transparent 38%), radial-gradient(circle at 88% 6%, rgba(22,163,106,.05), transparent 36%);
  --surface: #fff;
  --surface-2: #fff;
  --surface-soft: #f6f8fb;
  --text: #10151d;
  --muted: #667085;
  --slate: #475467;
  --border: #e3e7f0;
  --border-strong: #d3d9e6;
  --accent: #2f6fed;
  --accent-2: #4f6bff;
  --accent-soft: rgba(47,111,237,.08);
  --green: #16a36a;
  --green-soft: #ecfdf3;
  --red: #d92d20;
  --red-soft: #fef1f0;
  --orange: #f79009;
  --orange-soft: #fff7ed;
  --shadow: 0 14px 38px rgba(15,23,42,.08);
  --chart-grid: #eaeef4;
  --chart-zero: #b8c0ce;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; color-scheme: dark; }
:root[data-theme="light"] { color-scheme: light; }
body { margin: 0; background: var(--bg); background-image: var(--bg-grid); background-attachment: fixed; color: var(--text); font-family: "Manrope", system-ui, sans-serif; letter-spacing: 0; }
button, input, select { font: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
[hidden] { display: none !important; }

.app-header { position: sticky; top: 0; z-index: 20; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 24px; padding: 13px 28px; border-bottom: 1px solid var(--border); background: color-mix(in srgb, var(--surface) 84%, transparent); backdrop-filter: blur(18px) saturate(140%); }
.brand { display: flex; align-items: center; gap: 12px; min-width: 250px; }
.brand img { width: 46px; height: 34px; object-fit: contain; }
:root[data-theme="dark"] .brand img { filter: invert(1) brightness(1.25); }
.brand span { display: grid; line-height: 1.05; padding-left: 12px; border-left: 1px solid var(--border); }
.brand strong { font-size: 13px; letter-spacing: .06em; }
.brand small { margin-top: 5px; color: var(--muted); font-size: 11px; }
.main-nav { display: flex; justify-content: center; gap: 26px; color: var(--slate); font-size: 13px; font-weight: 650; }
.main-nav a:hover { color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 10px; }
.live-badge, .theme-toggle { display: inline-flex; align-items: center; gap: 7px; min-height: 34px; padding: 0 11px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface-soft); color: var(--muted); font-size: 12px; font-weight: 700; }
.live-badge i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 0 4px var(--green-soft); }
.theme-dot { width: 19px; height: 11px; border-radius: 10px; background: var(--accent); box-shadow: inset 8px 0 0 var(--surface-2); }

main { width: min(1500px, calc(100% - 48px)); margin: 0 auto; padding: 56px 0 72px; }
.intro { display: grid; grid-template-columns: 1fr auto; gap: 48px; align-items: end; padding: 0 4px 34px; }
.eyebrow { margin: 0 0 9px; color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase; }
.eyebrow.orange { color: var(--orange); }
h1, h2, h3, p { margin-top: 0; }
h1 { margin-bottom: 12px; font-size: clamp(32px, 4vw, 54px); line-height: 1.04; letter-spacing: 0; }
.lead { max-width: 850px; margin-bottom: 0; color: var(--muted); font-size: 16px; line-height: 1.65; }
.market-snapshot { min-width: 250px; padding: 18px 20px; border-left: 2px solid var(--accent); background: var(--surface); box-shadow: var(--shadow); }
.market-snapshot span, .market-snapshot small { display: block; color: var(--muted); font-size: 11px; }
.market-snapshot strong { display: block; margin: 5px 0; font-family: "JetBrains Mono", monospace; font-size: 25px; }

.workspace { display: grid; grid-template-columns: 370px minmax(0, 1fr); gap: 16px; align-items: start; }
.control-panel, .results-panel { border: 1px solid var(--border); border-radius: 8px; background: var(--surface); box-shadow: var(--shadow); }
.control-panel { position: sticky; top: 82px; padding: 24px; }
.results-panel { min-height: 790px; padding: 28px; }
.panel-heading, .result-heading, .subheading { display: flex; align-items: flex-start; justify-content: space-between; gap: 18px; }
.panel-heading h2, .result-heading h2 { margin: 0; font-size: 22px; }
.reset-button { padding: 7px 9px; border: 1px solid var(--border); border-radius: 6px; background: transparent; color: var(--muted); font-size: 12px; }
fieldset { min-width: 0; margin: 22px 0 0; padding: 0; border: 0; }
legend, label { color: var(--slate); font-size: 12px; font-weight: 700; }
.segmented { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin-top: 8px; padding: 4px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface-soft); }
.segmented label { position: relative; }
.segmented input { position: absolute; opacity: 0; pointer-events: none; }
.segmented span { display: flex; align-items: center; justify-content: center; min-height: 38px; padding: 7px; border-radius: 5px; color: var(--muted); text-align: center; }
.segmented input:checked + span { background: var(--accent-soft); color: var(--accent); box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 45%, transparent); }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 18px; }
label input { width: 100%; height: 43px; margin-top: 7px; padding: 0 11px; border: 1px solid var(--border); border-radius: 6px; outline: none; background: var(--surface-soft); color: var(--text); font-family: "JetBrains Mono", monospace; font-size: 13px; }
label input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.advanced { margin-top: 20px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.advanced summary { padding: 14px 0; color: var(--slate); cursor: pointer; font-size: 12px; font-weight: 750; }
.advanced-body { display: grid; gap: 11px; padding: 0 0 16px; }
.primary-button { width: 100%; min-height: 48px; margin-top: 22px; border: 0; border-radius: 6px; background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #06101c; font-weight: 800; box-shadow: 0 12px 28px color-mix(in srgb, var(--accent) 22%, transparent); }
.primary-button:disabled { opacity: .55; cursor: wait; }
.form-note { margin: 12px 0 0; color: var(--muted); font-size: 10px; line-height: 1.5; }

.empty-state, .loading-state, .message-state { display: grid; place-items: center; min-height: 690px; text-align: center; }
.empty-state h2, .loading-state h2, .message-state h2 { margin-bottom: 10px; font-size: 25px; }
.empty-state > p:last-child, .loading-state p, .message-state > p:last-of-type { max-width: 570px; color: var(--muted); line-height: 1.6; }
.empty-chart { display: flex; align-items: end; gap: 8px; width: 160px; height: 86px; margin-bottom: 25px; padding: 0 10px 8px; border-bottom: 1px solid var(--border-strong); }
.empty-chart span { flex: 1; height: 25%; background: var(--accent-soft); border-top: 2px solid var(--accent); }
.empty-chart span:nth-child(2) { height: 43%; }.empty-chart span:nth-child(3) { height: 37%; }.empty-chart span:nth-child(4) { height: 68%; }.empty-chart span:nth-child(5) { height: 82%; }
.loader { width: 38px; height: 38px; margin-bottom: 22px; border: 3px solid var(--border); border-top-color: var(--accent); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.message-state.error { background: var(--red-soft); }.message-state.warning { background: var(--orange-soft); }
.funnel { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; width: min(720px, 100%); margin-top: 18px; }
.funnel span { padding: 12px; border: 1px solid var(--border); background: var(--surface); color: var(--muted); font-size: 11px; }
.funnel strong { display: block; margin-top: 5px; color: var(--text); font: 700 16px "JetBrains Mono", monospace; }

.quality-badge { padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; background: var(--green-soft); color: var(--green); font-size: 11px; font-weight: 800; }
.kpi-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; margin-top: 22px; }
.kpi-grid article { min-width: 0; padding: 16px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface-soft); }
.kpi-grid span { color: var(--muted); font-size: 10px; }
.kpi-grid strong { display: block; margin-top: 8px; overflow: hidden; font: 700 17px "JetBrains Mono", monospace; text-overflow: ellipsis; }
.kpi-grid .positive strong { color: var(--green); }
.best-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: 10px; margin-top: 10px; }
.chart-panel, .execution-panel { border: 1px solid var(--border); border-radius: 7px; background: var(--surface-soft); }
.chart-panel { padding: 18px; overflow: hidden; }
.subheading { align-items: center; }
.subheading h3, .execution-panel h3 { margin-bottom: 5px; font-size: 16px; }
.subheading p { margin: 0; color: var(--muted); font-size: 11px; }
#payoffChart { display: block; width: 100%; height: 330px; margin-top: 14px; cursor: crosshair; touch-action: none; }
.chart-legend { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 8px; color: var(--muted); font-size: 10px; }
.chart-legend span { display: inline-flex; align-items: center; gap: 6px; }
.chart-legend i { width: 18px; height: 2px; background: var(--accent); }.chart-legend i.target { border-top: 2px dashed var(--orange); background: none; }.chart-legend i.strike { border-top: 2px dotted var(--muted); background: none; }
.profile-explorer { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); }
.profile-explorer > label { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; color: var(--muted); font-size: 10px; }
.profile-explorer > label strong { color: var(--text); font: 700 15px/1.2 "JetBrains Mono", monospace; }
#profilePriceSlider { width: 100%; margin: 12px 0 14px; accent-color: var(--accent); cursor: ew-resize; }
.profile-readout { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
.profile-readout article { min-width: 0; padding: 10px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface); }
.profile-readout span, .profile-readout small { display: block; color: var(--muted); font-size: 9px; line-height: 1.35; }
.profile-readout strong { display: block; margin: 5px 0 3px; overflow-wrap: anywhere; color: var(--text); font: 700 12px/1.25 "JetBrains Mono", monospace; }
.profile-readout strong.positive { color: var(--green); }.profile-readout strong.negative { color: var(--red); }
.execution-panel { padding: 18px; }
.execution-panel dl { margin: 16px 0; }
.execution-panel dl div { display: flex; justify-content: space-between; gap: 12px; padding: 11px 0; border-bottom: 1px solid var(--border); }
.execution-panel dt { color: var(--muted); font-size: 11px; }.execution-panel dd { margin: 0; text-align: right; font: 650 11px "JetBrains Mono", monospace; }
.order-ticket { margin-bottom: 20px; padding: 14px; border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--border)); border-left: 3px solid var(--accent); border-radius: 6px; background: var(--accent-soft); }
.order-ticket h3 { margin: 4px 0 12px; }
.order-ticket .limit-price { padding: 12px; border: 1px solid var(--border); border-radius: 6px; background: var(--surface); }
.order-ticket .limit-price span, .order-ticket > small { display: block; color: var(--muted); font-size: 9px; line-height: 1.45; }
.order-ticket .limit-price strong { display: block; margin-top: 6px; color: var(--accent); font: 750 22px/1.2 "JetBrains Mono", monospace; }
.order-ticket .limit-details { margin: 8px 0 !important; }
.order-ticket .limit-details div { padding: 8px 0; }
.order-ticket dd.positive { color: var(--green); }.order-ticket dd.negative { color: var(--red); }
.limit-disclaimer { margin: 12px 0 0; color: var(--muted); font-size: 9px; line-height: 1.5; }
.risk-note { padding: 12px; border: 1px solid color-mix(in srgb, var(--orange) 25%, transparent); border-radius: 6px; background: var(--orange-soft); color: color-mix(in srgb, var(--orange) 78%, var(--text)); font-size: 10px; line-height: 1.55; }
.table-section { margin-top: 10px; padding: 18px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface-soft); }
.table-section .subheading > span { color: var(--muted); font: 600 11px "JetBrains Mono", monospace; }
.table-wrap { margin-top: 15px; overflow: auto; border: 1px solid var(--border); border-radius: 6px; }
table { width: 100%; border-collapse: collapse; white-space: nowrap; font-size: 11px; }
th, td { padding: 12px 10px; border-bottom: 1px solid var(--border); text-align: right; }
th { position: sticky; top: 0; z-index: 2; background: var(--surface); color: var(--muted); font-size: 9px; text-transform: uppercase; }
th:first-child, td:first-child { text-align: left; }
td { font-family: "JetBrains Mono", monospace; }
tbody tr:hover { background: var(--accent-soft); }
td.roi { color: var(--green); font-weight: 700; }

.info-band { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 18px; }
.info-band article { padding: 26px; border: 1px solid var(--border); border-left: 3px solid var(--accent); background: var(--surface); }
.info-band article:last-child { border-left-color: var(--orange); }
.info-band h2 { margin-bottom: 10px; font-size: 20px; }.info-band p:last-child { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
footer { display: flex; justify-content: space-between; gap: 20px; padding: 22px 28px; border-top: 1px solid var(--border); color: var(--muted); font-size: 10px; }

@media (max-width: 1150px) {
  .workspace { grid-template-columns: 330px minmax(0, 1fr); }
  .best-layout { grid-template-columns: 1fr; }
  .execution-panel dl { display: grid; grid-template-columns: 1fr 1fr; gap: 0 18px; }
  .kpi-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 860px) {
  .app-header { grid-template-columns: 1fr auto; padding: 11px 16px; }.main-nav { display: none; }.brand { min-width: 0; }.live-badge { display: none; }
  main { width: min(100% - 24px, 1500px); padding-top: 30px; }.intro { grid-template-columns: 1fr; gap: 18px; }.market-snapshot { min-width: 0; }
  .workspace { grid-template-columns: 1fr; }.control-panel { position: static; }.results-panel { min-height: 620px; }.empty-state, .loading-state, .message-state { min-height: 520px; }
  .info-band { grid-template-columns: 1fr; }.kpi-grid { grid-template-columns: repeat(2, 1fr); }
  footer { flex-direction: column; }
}
@media (max-width: 520px) {
  .brand span { display: none; }.theme-toggle { padding-right: 7px; }.theme-toggle #themeLabel { display: none; }
  h1 { font-size: 34px; }.control-panel, .results-panel { padding: 18px; }.field-grid { grid-template-columns: 1fr; }
  .vertical-mobile { grid-template-columns: 1fr; }.kpi-grid { grid-template-columns: 1fr 1fr; }.execution-panel dl { grid-template-columns: 1fr; }
  #payoffChart { height: 270px; }.funnel { grid-template-columns: 1fr 1fr; }
  .profile-readout { grid-template-columns: 1fr 1fr; }
}