:root {
  --bg: #0b0e14;
  --bg-raised: #11151d;
  --card: #161a23;
  --card-2: #1b212c;
  --border: #232838;
  --text: #e7eaf0;
  --muted: #8b94a7;
  --accent: #ff6a3d;
  --accent-dim: #ff6a3d33;
  --green: #1dbf73;
  --green-dim: #1dbf7322;
  --red: #ef4444;
  --red-dim: #ef444422;
  --profit-fill: #2ee6a6;
  --loss-fill: #ff6b6b;
  --blue: #3d9bff;
  --radius: 10px;
  --radius-lg: 16px;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Inter, Roboto, Arial, sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}
.tabular, table, .num { font-variant-numeric: tabular-nums; }
a { color: inherit; text-decoration: none; }
.container { max-width: 1320px; margin: 0 auto; padding: 0 18px 60px; }
h1, h2, h3 { margin: 0 0 4px; font-weight: 600; }
.muted { color: var(--muted); }
.pos { color: var(--green); }
.neg { color: var(--red); }
.flat { color: var(--muted); }

/* ---- Nav --------------------------------------------------------------- */
#nav { position: sticky; top: 0; z-index: 50; background: rgba(11,14,20,0.92); backdrop-filter: blur(6px); border-bottom: 1px solid var(--border); }
.nav-inner { max-width: 1320px; margin: 0 auto; display: flex; align-items: center; gap: 24px; padding: 12px 18px; }
.brand { font-weight: 700; font-size: 18px; letter-spacing: 0.2px; white-space: nowrap; }
.brand span { color: var(--accent); }
.nav-links { display: flex; gap: 4px; overflow-x: auto; flex: 1; }
.nav-links a { padding: 8px 14px; border-radius: 999px; color: var(--muted); font-weight: 500; white-space: nowrap; }
.nav-links a:hover { color: var(--text); background: var(--card); }
.nav-links a.active { color: var(--text); background: var(--card-2); }
.nav-right { display: flex; align-items: center; gap: 10px; white-space: nowrap; }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); display: inline-block; }
.dot.ok { background: var(--green); box-shadow: 0 0 6px var(--green); }
.dot.warn { background: #f5a623; box-shadow: 0 0 6px #f5a623; }
.dot.off { background: var(--red); }
.nav-toggle { display: none; background: var(--card-2); border: 1px solid var(--border); color: var(--text); border-radius: 8px; width: 40px; height: 34px; font-size: 18px; line-height: 1; cursor: pointer; }

/* ---- Pills / badges ----------------------------------------------------- */
.pill { display: inline-flex; align-items: center; gap: 6px; padding: 5px 12px; border-radius: 999px; font-size: 12px; font-weight: 700; letter-spacing: 0.3px; }
.pill.paper { background: var(--green-dim); color: var(--green); }
.pill.live { background: var(--red-dim); color: var(--red); }
.pill.atm { background: var(--accent-dim); color: var(--accent); }
.pill.ghost { background: var(--card-2); color: var(--muted); }
th[data-sort] { cursor: pointer; user-select: none; white-space: nowrap; }
th[data-sort]:hover { color: var(--text); }

/* Option-chain B/S buttons: outlined until that exact strike+side is in the
   strategy, then solid with a ring - so selected strikes stay visibly marked. */
#chainBody .btn-buy:not(.sel) { background: transparent; color: var(--green); border-color: var(--green); opacity: 0.75; }
#chainBody .btn-sell:not(.sel) { background: transparent; color: var(--red); border-color: var(--red); opacity: 0.75; }
#chainBody .btn-buy.sel { background: var(--green); color: #06140c; box-shadow: 0 0 0 2px var(--green-dim); opacity: 1; }
#chainBody .btn-sell.sel { background: var(--red); color: #1a0606; box-shadow: 0 0 0 2px var(--red-dim); opacity: 1; }
@keyframes bs-pop { 50% { transform: scale(1.45); } }
#chainBody .btn-mini.pop { animation: bs-pop 0.35s ease; }
button.pill { border: 1px solid var(--border); transition: filter .15s, border-color .15s; }
button.pill:hover { filter: brightness(1.15); border-color: var(--muted); }
button.pill.paper:hover { border-color: var(--green); }
button.pill.live:hover { border-color: var(--red); }

/* ---- Buttons -------------------------------------------------------------- */
.btn { border: 1px solid var(--border); background: var(--card-2); color: var(--text); border-radius: 999px; padding: 9px 18px; font-size: 13px; font-weight: 600; cursor: pointer; transition: filter .1s; }
.btn:hover { filter: brightness(1.15); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #1a0d06; }
.btn-buy { background: var(--green); border-color: var(--green); color: #06140c; }
.btn-sell { background: var(--red); border-color: var(--red); color: #1a0606; }
.btn-ghost { background: transparent; }
.btn-danger { background: transparent; border-color: var(--red); color: var(--red); }
.btn-mini { border: 1px solid var(--border); background: var(--card-2); color: var(--text); border-radius: 8px; padding: 4px 10px; font-size: 12px; cursor: pointer; }
.btn-mini.ghost { background: transparent; border: none; color: var(--muted); }
.icon-btn { width: 28px; height: 28px; border-radius: 8px; border: 1px solid var(--border); background: var(--card-2); color: var(--text); cursor: pointer; font-size: 15px; line-height: 1; }

/* ---- Cards / layout -------------------------------------------------------- */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 16px; }
.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: 1fr 1.3fr; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
.section-title { font-size: 13px; text-transform: uppercase; letter-spacing: 0.6px; color: var(--muted); margin-bottom: 10px; }

/* ---- Chain page: header controls + builder layout ---------------------------- */
.chain-controls { display: flex; flex-wrap: wrap; gap: 12px 14px; align-items: flex-end; }
.chain-controls > div { display: flex; flex-direction: column; }
.chain-controls label { margin-bottom: 4px; }
.chain-controls #rangeInput { width: 110px; }

.builder-wrap {
  display: grid; gap: 16px; align-items: start;
  grid-template-columns: 1fr 1.3fr;
  grid-template-areas:
    "strategy analysis"
    "entry    analysis"
    "live     live"
    "chain    chain";
}
.builder-wrap > * { min-width: 0; }   /* let wide tables scroll, not blow out the column */
.blk-strategy { grid-area: strategy; }
.blk-analysis { grid-area: analysis; }
.blk-entry    { grid-area: entry; }
.blk-live     { grid-area: live; }
.blk-chain    { grid-area: chain; }

@media (max-width: 1000px) {
  .builder-wrap {
    grid-template-columns: 1fr;
    grid-template-areas: "strategy" "analysis" "live" "chain" "entry";
  }
}
@media (max-width: 760px) {
  .chain-controls { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 12px; align-items: end; }
  .chain-controls > div { min-width: 0; }
  .chain-controls select, .chain-controls #rangeInput, .chain-controls .pill { width: 100%; }
  .chain-controls .cc-atm { grid-column: 1 / -1; }
  .chain-controls .cc-atm .btn { width: 100%; }
}

/* ---- Forms ------------------------------------------------------------------ */
input, select { background: var(--bg-raised); border: 1px solid var(--border); color: var(--text); border-radius: 8px; padding: 8px 10px; font-size: 13px; }
input[type=number]::-webkit-inner-spin-button, input[type=number]::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
input[type=number] { -moz-appearance: textfield; }
input:focus, select:focus { outline: none; border-color: var(--accent); }
label { font-size: 12px; color: var(--muted); display: block; margin-bottom: 4px; }
.field { margin-bottom: 12px; }
.stepper { display: inline-flex; align-items: center; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.stepper button { background: var(--card-2); border: none; color: var(--text); width: 28px; height: 30px; cursor: pointer; font-size: 15px; }
.stepper input { width: 64px; text-align: center; border: none; border-left: 1px solid var(--border); border-right: 1px solid var(--border); border-radius: 0; height: 30px; }

/* ---- Toggle switch ----------------------------------------------------------- */
.switch { position: relative; display: inline-block; width: 38px; height: 22px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .slider { position: absolute; inset: 0; background: var(--border); border-radius: 999px; cursor: pointer; transition: .15s; }
.switch .slider::before { content: ""; position: absolute; width: 16px; height: 16px; left: 3px; top: 3px; background: var(--muted); border-radius: 50%; transition: .15s; }
.switch input:checked + .slider { background: var(--accent-dim); }
.switch input:checked + .slider::before { transform: translateX(16px); background: var(--accent); }

/* ---- Meters (distance to breach) ----------------------------------------- */
.meter { height: 6px; border-radius: 999px; background: var(--card-2); overflow: hidden; }
.meter > span { display: block; height: 100%; background: var(--accent); border-radius: 999px; }
.meter.danger > span { background: var(--red); }

/* ---- Tables ------------------------------------------------------------------ */
table { width: 100%; border-collapse: collapse; }
th, td { padding: 8px 10px; text-align: right; font-size: 13px; }
th { color: var(--muted); font-weight: 600; text-transform: uppercase; font-size: 11px; letter-spacing: 0.4px; border-bottom: 1px solid var(--border); }
td:first-child, th:first-child { text-align: left; }
tr.atm-row td { background: var(--accent-dim); font-weight: 700; }
tr:hover td { background: var(--card-2); }
.oi-bar-wrap { position: relative; height: 18px; min-width: 70px; }
.oi-bar { position: absolute; top: 0; bottom: 0; border-radius: 3px; }
.oi-bar.ce { right: 0; background: linear-gradient(90deg, transparent, var(--red)); opacity: 0.55; }
.oi-bar.pe { left: 0; background: linear-gradient(270deg, transparent, var(--green)); opacity: 0.55; }
.itm-ce td.ce-cell, .itm-pe td.pe-cell { background: rgba(255,255,255,0.03); }

/* ---- Index strip -------------------------------------------------------------- */
.strip { display: flex; gap: 8px; overflow-x: auto; padding-bottom: 4px; flex-wrap: nowrap; }
.strip-chip { flex: 1 1 0; min-width: 96px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 8px 10px; }
.strip-chip .name { font-size: 10px; color: var(--muted); text-transform: uppercase; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.strip-chip .price { font-size: 15px; font-weight: 700; margin-top: 2px; white-space: nowrap; }
.strip-chip .chg { font-size: 11px; margin-top: 2px; white-space: nowrap; }
.strip-chip.gift { border-color: var(--accent); }

/* ---- Alert toast -------------------------------------------------------------- */
.alert-host { position: fixed; right: 16px; bottom: 16px; display: flex; flex-direction: column; gap: 8px; z-index: 999; max-width: 360px; }
.alert-toast { background: var(--card-2); border: 1px solid var(--accent); border-radius: var(--radius); padding: 12px 14px; font-size: 13px; box-shadow: 0 8px 24px rgba(0,0,0,0.4); }
.alert-toast button { margin-left: 6px; margin-top: 6px; }

/* ---- Payoff chart -------------------------------------------------------------- */
.payoff-svg { width: 100%; height: auto; }

/* ---- Risk panel ----------------------------------------------------------------- */
.risk-row { display: flex; align-items: center; gap: 10px; padding: 7px 0; flex-wrap: wrap; }
.risk-label { min-width: 150px; font-size: 13px; }
.risk-row .meter { flex: 1 1 70px; min-width: 50px; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; }
.seg-btn { background: var(--card-2); border: none; color: var(--muted); padding: 6px 10px; font-size: 12px; cursor: pointer; }
.seg-btn.active { background: var(--accent-dim); color: var(--accent); }
.pos-card + .pos-card { margin-top: 14px; }
.leg-row { display: grid; grid-template-columns: 64px 46px 76px 1fr 86px 86px 28px; gap: 8px; align-items: center; padding: 6px 0; border-bottom: 1px solid var(--border); }
.leg-row:last-child { border-bottom: none; }
@media (max-width: 760px) { .leg-row { grid-template-columns: 1fr 1fr; row-gap: 6px; padding: 10px 0; } }
.builder-summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(112px, 1fr)); gap: 10px; margin: 14px 0; }
.builder-summary .stat { background: var(--card-2); border-radius: var(--radius); padding: 10px 12px; }
.builder-summary .stat .v { font-size: 17px; font-weight: 700; }
@media (max-width: 760px) { .builder-summary { grid-template-columns: 1fr 1fr; } }
.panel { background: var(--card-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; margin-bottom: 16px; }
.panel:last-child { margin-bottom: 0; }
.panel-title { font-size: 13px; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.panel-title .n { display: inline-flex; align-items: center; justify-content: center; width: 18px; height: 18px; border-radius: 50%; background: var(--accent); color: #1a0d06; font-size: 11px; margin-right: 7px; }
.stepper-labeled { display: flex; align-items: center; gap: 8px; }
.stepper-labeled .muted { font-size: 11px; min-width: 36px; }
.stepper input { width: 64px; }
#lotsInput { width: 56px; }

/* ---- Misc -------------------------------------------------------------------- */
.banner { background: var(--card-2); border: 1px solid var(--accent); border-radius: var(--radius); padding: 10px 14px; font-size: 13px; margin-bottom: 16px; }
hr.sep { border: none; border-top: 1px solid var(--border); margin: 14px 0; }
.empty { color: var(--muted); text-align: center; padding: 30px 0; }

/* ---- Responsive ----------------------------------------------------------------- */
@media (max-width: 1000px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .container { padding: 0 10px 90px; }

  /* Nav collapses to a hamburger menu */
  .nav-inner { position: relative; padding: 10px 12px; gap: 10px; }
  .brand { font-size: 16px; margin-right: auto; }
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .nav-links {
    position: absolute; top: 100%; left: 0; right: 0;
    flex: none; flex-direction: column; gap: 2px; overflow-x: visible;
    background: var(--bg-raised); border-bottom: 1px solid var(--border);
    padding: 8px; display: none; box-shadow: 0 12px 24px rgba(0,0,0,0.45);
  }
  .nav-inner.open .nav-links { display: flex; }
  .nav-links a { padding: 13px 14px; font-size: 15px; }
  .nav-right { gap: 8px; }
  #modePill { padding: 5px 9px; font-size: 11px; }
  #connBtn { padding: 6px 9px; font-size: 12px; }

  h1 { font-size: 20px; }
  h2 { font-size: 18px; }
  .section-title { font-size: 12px; }
  th, td { padding: 10px 7px; font-size: 13px; }
  .btn { padding: 11px 16px; font-size: 14px; }
  .btn-mini { padding: 8px 12px; font-size: 13px; }
  /* 16px inputs stop iOS Safari from auto-zooming the page on focus */
  input, select { padding: 11px 10px; font-size: 16px; }
  .strip-chip { min-width: 104px; padding: 9px 11px; }
  .strip-chip .price { font-size: 16px; }
  .risk-label { min-width: 120px; }
  /* Toasts span the width on a phone so they're readable */
  .alert-host { left: 8px; right: 8px; bottom: 8px; max-width: none; }
}