:root {
  --bg: #0a0a0b;
  --panel: #141416;
  --panel-2: #1d1d20;
  --line: #2c2c31;
  --text: #ececec;
  --muted: #8b8b92;
  --accent: #ff3b30;      /* red */
  --accent-b: #e8e8ea;    /* B leg (light, for contrast on red/black) */
  --up: #35c46a;          /* profitable spread */
  --down: #ff453a;        /* red */
  --flat: #8b8b92;
}
:root.light {
  --bg: #f4f4f6;
  --panel: #ffffff;
  --panel-2: #f0f0f3;
  --line: #e3e3e8;
  --text: #1a1a1d;
  --muted: #6d6d76;
  --accent: #e02d24;
  --accent-b: #1d1d20;    /* B leg goes dark on light theme */
  --up: #159a4f;
  --down: #e02d24;
  --flat: #8a8a92;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(1200px 600px at 80% -10%, #2a0b0c 0%, var(--bg) 55%);
}
:root.light body {
  background: radial-gradient(1200px 600px at 80% -10%, #ffe3e1 0%, var(--bg) 55%);
  color: var(--text);
  font: 14px/1.4 -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  min-height: 100vh;
}

/* ---- top bar ---- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(11, 14, 20, 0.6);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  font-size: 26px;
  color: var(--accent);
  filter: drop-shadow(0 0 10px rgba(255, 59, 48, 0.55));
}
.title { font-size: 17px; font-weight: 700; letter-spacing: 0.2px; }
.subtitle { font-size: 12px; color: var(--muted); }

.controls { display: flex; align-items: center; gap: 12px; }
.tf-label { color: var(--muted); font-size: 12px; display: flex; align-items: center; gap: 6px; }

select, .sym-input, .add-btn, .ghost {
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 13px;
  outline: none;
}
select { cursor: pointer; }
select:focus, .sym-input:focus { border-color: var(--accent); }
.ghost { cursor: pointer; color: var(--muted); }
.ghost:hover { color: var(--text); border-color: var(--muted); }

/* ---- builder ---- */
.builder {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  max-width: 1200px;
  margin: 0 auto;
}
.sym-input { width: 240px; }
.leg-pick { display: flex; align-items: center; gap: 6px; }
.tag {
  width: 20px; height: 20px; border-radius: 5px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; color: #0b0e14;
}
.tag-a { background: var(--accent); color: #fff; }
.tag-b { background: var(--accent-b); }
.vs { color: var(--muted); font-size: 16px; }
.add-btn {
  background: var(--accent); border-color: transparent; color: #fff;
  font-weight: 600; cursor: pointer;
}
.add-btn:hover { filter: brightness(1.08); }

/* ---- grid ---- */
.grid {
  display: block;
  max-width: 1200px;
  margin: 0 auto;
  padding: 6px 20px 28px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 20px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}
.card-head {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
}
.card-head .pair { justify-self: start; }
.card-head .rm { justify-self: end; }
.pair .sym { font-size: 22px; font-weight: 700; }
.pair .quote { color: var(--muted); font-size: 14px; }
.rm {
  background: transparent; border: none; color: var(--muted);
  font-size: 22px; line-height: 1; cursor: pointer; padding: 0 4px;
}
.rm:hover { color: var(--down); }

.spread-main {
  justify-self: center; text-align: center;
  font-size: 44px; font-weight: 800; letter-spacing: 0.5px;
  font-variant-numeric: tabular-nums; color: var(--flat); line-height: 1;
}
.spread-main.up { color: var(--up); }
.spread-main.down { color: var(--down); }
.spread-main.flat { color: var(--flat); }
.spread-sub { text-align: center; font-size: 13px; color: var(--muted); margin-top: -4px; }
.spread-sub b.up { color: var(--up); }
.spread-sub b.flat { color: var(--text); }

.legs { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.leg {
  display: grid;
  grid-template-columns: 12px 1fr auto;
  grid-template-areas: "dot ex price" "dot ex ba";
  align-items: center;
  column-gap: 10px;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--panel-2);
}
.leg-a { border-left: 3px solid var(--accent); }
.leg-b { border-left: 3px solid var(--accent-b); }
.leg .dot { grid-area: dot; width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.leg .dot.live { background: var(--up); box-shadow: 0 0 6px rgba(46,194,110,0.7); }
.leg .dot.connecting { background: #e6b800; animation: pulse 1s infinite; }
.leg .dot.down { background: var(--down); }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }
.leg .ex {
  grid-area: ex; color: var(--muted); font-size: 13px; font-weight: 600;
  text-decoration: none; white-space: nowrap;
  display: inline-flex; align-items: center; gap: 6px;
}
.leg .ex:hover { color: var(--text); }
.leg .ex .ext { opacity: 0.5; font-size: 11px; }
.leg .ex:hover .ext { opacity: 1; color: var(--accent); }
.leg .price {
  grid-area: price; text-align: right; font-weight: 700;
  font-variant-numeric: tabular-nums; font-size: 18px;
}
.leg .price.stale { color: var(--muted); }
.leg .ba {
  grid-area: ba; text-align: right; color: var(--muted);
  font-size: 12px; font-variant-numeric: tabular-nums;
}

canvas.spark { width: 100%; height: 48vh; min-height: 320px; display: block; }

.stats {
  text-align: center; font-size: 12px; color: var(--muted);
  font-variant-numeric: tabular-nums; border-top: 1px solid var(--line);
  padding-top: 10px;
}

/* funding-farm + volume strip (top of card) */
.fund-strip {
  display: flex; flex-direction: column; gap: 8px;
  padding: 12px 16px; border-radius: 12px;
  background: linear-gradient(180deg, rgba(255,59,48,0.07), rgba(255,255,255,0.02));
  border: 1px solid var(--line);
}
.fs-farm { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 10px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.fs-k { font-size: 10px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--muted); }
.fs-v { font-size: 16px; font-weight: 700; font-variant-numeric: tabular-nums; color: var(--text); }
.fs-v.up { color: var(--up); }
.fs-v.flat { color: var(--muted); font-weight: 600; font-size: 13px; }
.fs-rows { display: flex; flex-direction: column; gap: 6px; }
.fs-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.fs-name { font-weight: 700; font-size: 13px; min-width: 130px; }
.fs-a .fs-name { color: var(--accent); }
.fs-b .fs-name { color: var(--accent-b); }
.fs-chip { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.fs-chip b { color: var(--text); font-weight: 700; margin-left: 3px; }
.fs-chip b.pos { color: var(--up); }
.fs-chip b.neg { color: var(--down); }
.exi {
  width: 16px; height: 16px; border-radius: 4px; object-fit: contain;
  vertical-align: middle; background: rgba(255,255,255,0.06); flex: 0 0 auto;
}

/* custom dropdown (exchange / market pickers) */
.cselect { position: relative; display: inline-block; }
.cs-trigger {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--panel-2); border: 1px solid var(--line); color: var(--text);
  border-radius: 10px; padding: 8px 12px; font: inherit; font-size: 13px; line-height: 1;
  cursor: pointer;
}
.cs-trigger:hover, .cselect.open .cs-trigger { border-color: var(--accent); }
.cs-lbl { font-weight: 600; }
.cs-chev { margin-left: 6px; color: var(--muted); font-size: 10px; }
.cs-menu {
  position: absolute; z-index: 60; top: calc(100% + 4px); left: 0; min-width: 100%;
  background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 4px;
  display: none; max-height: 340px; overflow-y: auto;
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.55);
}
.cselect.open .cs-menu { display: block; }
.cs-opt {
  display: flex; align-items: center; gap: 8px; padding: 8px 10px;
  border-radius: 7px; cursor: pointer; font-size: 13px; font-weight: 600;
  white-space: nowrap; color: var(--text);
}
.cs-opt:hover { background: var(--panel-2); }
.cs-opt.sel { background: rgba(255, 59, 48, 0.16); }
.cs-trigger .exi, .cs-opt .exi { width: 18px; height: 18px; }

/* grouped columns (Futures / Spot / DEX) */
.cs-cols { display: flex; gap: 6px; }
.cs-col { min-width: 128px; }
.cs-col:not(:last-child) { border-right: 1px solid var(--line); padding-right: 6px; }
.cs-col-h {
  font-size: 10px; text-transform: uppercase; letter-spacing: 0.6px;
  color: var(--muted); padding: 4px 10px 6px; font-weight: 700;
}
.fs-cd { color: var(--muted); }

/* timeframe buttons */
.tf-group { display: inline-flex; gap: 2px; background: var(--panel-2); border: 1px solid var(--line); border-radius: 10px; padding: 3px; }
.tf-group button {
  background: transparent; border: none; color: var(--muted); font: inherit; font-size: 12px;
  font-weight: 700; padding: 5px 10px; border-radius: 7px; cursor: pointer;
}
.tf-group button:hover { color: var(--text); }
.tf-group button.on { background: var(--accent); color: #fff; }

/* alert threshold */
.alert-label { display: inline-flex; align-items: center; gap: 5px; color: var(--muted); font-size: 12px; }
.alert-label input {
  width: 56px; background: var(--panel-2); border: 1px solid var(--line); color: var(--text);
  border-radius: 8px; padding: 6px 8px; font: inherit; font-size: 13px;
}
.alert-label input:focus { outline: none; border-color: var(--accent); }

/* card head buttons */
.head-btns { justify-self: end; display: inline-flex; align-items: center; gap: 6px; }
.head-btns .share {
  background: transparent; border: none; cursor: pointer; font-size: 15px;
  color: var(--muted); padding: 0 2px;
}
.head-btns .share:hover { color: var(--text); }

/* chart legend */
.chart-legend { display: flex; gap: 18px; justify-content: center; font-size: 12px; color: var(--muted); }
.chart-legend .lg { display: inline-flex; align-items: center; gap: 6px; }
.chart-legend .lg i { width: 14px; height: 3px; border-radius: 2px; display: inline-block; }
.chart-legend .exi { width: 14px; height: 14px; }
.chart-legend .lg-a i { background: var(--accent); }
.chart-legend .lg-b i { background: var(--accent-b); }

.foot {
  color: var(--muted); font-size: 12px;
  padding: 0 20px 28px; max-width: 900px; line-height: 1.5;
}

@media (max-width: 640px) {
  .grid { padding: 4px 12px 24px; }
  .legs { grid-template-columns: 1fr; }
  .sym-input { width: 100%; }
  .builder { padding: 12px; }
  .spread-main { font-size: 34px; }
  .card-head { grid-template-columns: 1fr auto; }
  .spread-main { grid-column: 1 / -1; grid-row: 2; justify-self: center; }
  canvas.spark { height: 40vh; min-height: 240px; }
}