/* ── tokens ─────────────────────────────────────────────────────────── */
:root {
  --bg: #eef0f7;
  --panel: rgba(255, 255, 255, 0.58);
  --panel-strong: rgba(255, 255, 255, 0.8);
  --border: rgba(28, 38, 74, 0.1);
  --border-soft: rgba(28, 38, 74, 0.07);
  --txt: #1d2337;
  --muted: #5d6580;
  --faint: #8b91a6;
  --accent: #5057d8;
  --bid: #0d9d6d;
  --ask: #de4560;
  --bid-soft: rgba(13, 157, 109, 0.13);
  --ask-soft: rgba(222, 69, 96, 0.12);
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --radius: 18px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: linear-gradient(165deg, #f2f3fa 0%, #e9ecf6 55%, #eef0f7 100%);
  color: var(--txt);
  font: 15px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  min-height: 100vh;
}

.mono { font-family: var(--mono); }
.muted { color: var(--muted); font-size: 13px; }

/* ── ambient orbs ───────────────────────────────────────────────────── */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.6;
}
.orb-a { width: 560px; height: 560px; top: -180px; left: -120px;
         background: radial-gradient(circle, rgba(120, 126, 255, 0.35), transparent 65%); }
.orb-b { width: 480px; height: 480px; top: 340px; right: -160px;
         background: radial-gradient(circle, rgba(45, 212, 191, 0.28), transparent 65%); }
.orb-c { width: 640px; height: 640px; bottom: -260px; left: 30%;
         background: radial-gradient(circle, rgba(196, 160, 255, 0.25), transparent 65%); }

/* ── glass ──────────────────────────────────────────────────────────── */
.glass {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  backdrop-filter: blur(22px) saturate(160%);
  -webkit-backdrop-filter: blur(22px) saturate(160%);
  box-shadow: 0 14px 40px rgba(45, 55, 100, 0.1),
              inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

/* ── layout ─────────────────────────────────────────────────────────── */
main { position: relative; z-index: 1; max-width: 1120px; margin: 0 auto; padding: 0 28px 80px; }

.nav {
  position: relative; z-index: 2;
  max-width: 1120px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 26px 28px;
}
.wordmark { font-weight: 700; font-size: 17px; letter-spacing: -0.02em; }
.wordmark span { color: var(--accent); font-weight: 500; }

/* ── hero (centered) ────────────────────────────────────────────────── */
.hero {
  padding: 64px 0 60px;
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
}
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(34px, 5.4vw, 54px);
  line-height: 1.08; letter-spacing: -0.03em; font-weight: 700;
}
.hero h1 em {
  font-style: normal;
  background: linear-gradient(100deg, #565de0 0%, #0aa384 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .sub { margin: 22px auto 0; font-size: 17px; color: var(--muted); max-width: 620px; }
.hero .sub strong { color: var(--txt); }

.chips { display: flex; gap: 12px; margin-top: 34px; flex-wrap: wrap; justify-content: center; }
.chip {
  display: flex; align-items: baseline; gap: 8px;
  padding: 10px 18px; border-radius: 999px;
  background: var(--panel); border: 1px solid var(--border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 6px 18px rgba(45, 55, 100, 0.07);
}
.chip b { font-family: var(--mono); font-size: 15px; color: var(--txt); }
.chip span { font-size: 12.5px; color: var(--muted); }

/* ── buttons & inputs ───────────────────────────────────────────────── */
.btn {
  font: 600 13.5px/1 var(--sans); color: var(--accent);
  background: rgba(80, 87, 216, 0.1);
  border: 1px solid rgba(80, 87, 216, 0.3);
  border-radius: 10px; padding: 10px 16px; cursor: pointer;
  text-decoration: none; transition: background 0.15s, border-color 0.15s;
}
.btn:hover { background: rgba(80, 87, 216, 0.18); }
.btn.ghost { background: var(--panel); border-color: var(--border); color: var(--txt); }
.btn.ghost:hover { background: var(--panel-strong); }
.btn.small { padding: 7px 13px; font-size: 12.5px; }
.btn.wide { width: 100%; padding: 11px; margin-top: 10px; }

input, select {
  width: 100%; color: var(--txt);
  background: rgba(255, 255, 255, 0.65);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 9px 12px; font: 500 13px var(--mono);
  outline: none; appearance: none;
}
input:focus, select:focus { border-color: rgba(80, 87, 216, 0.5); }
select { cursor: pointer; }
option { background: #ffffff; }

input[type="range"] {
  appearance: none; -webkit-appearance: none;
  background: transparent; border: none; padding: 0; height: 22px;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 3px; border-radius: 2px; background: rgba(28, 38, 74, 0.16);
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px; margin-top: -5.5px;
  border-radius: 50%; background: var(--accent);
  border: 2px solid #ffffff; cursor: pointer;
  box-shadow: 0 1px 4px rgba(45, 55, 100, 0.3);
}

/* ── demo grid ──────────────────────────────────────────────────────── */
.demo-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 20px;
  align-items: start;
}
.demo-side { display: flex; flex-direction: column; gap: 20px; }

.card { padding: 22px 24px; }
.card-head {
  display: flex; align-items: baseline; justify-content: space-between;
  margin-bottom: 14px;
}
.card h2 { font-size: 15px; font-weight: 600; letter-spacing: -0.01em; }
.card h3 { font-size: 13px; font-weight: 600; color: var(--muted);
           text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 12px; }

/* ── ladder ─────────────────────────────────────────────────────────── */
.quote-line { font-size: 12.5px; color: var(--muted); }
.quote-line b { color: var(--txt); }

.ladder-head {
  display: grid; grid-template-columns: 1fr 1fr 64px;
  font-size: 11px; color: var(--faint); text-transform: uppercase;
  letter-spacing: 0.1em; padding: 0 10px 8px;
  border-bottom: 1px solid var(--border-soft);
}
.ladder-head span:nth-child(2) { text-align: right; }
.ladder-head span:nth-child(3) { text-align: right; }

.ladder { font-family: var(--mono); font-size: 13px; }
.lrow {
  position: relative; display: grid; grid-template-columns: 1fr 1fr 64px;
  padding: 3.5px 10px; border-radius: 6px; overflow: hidden;
}
.lrow .px { z-index: 1; }
.lrow .qty, .lrow .cnt { text-align: right; z-index: 1; color: var(--muted); }
.lrow .bar {
  position: absolute; right: 0; top: 0; bottom: 0; border-radius: 4px;
}
.lrow.ask .px { color: var(--ask); }
.lrow.ask .bar { background: linear-gradient(to left, var(--ask-soft), transparent); }
.lrow.bid .px { color: var(--bid); }
.lrow.bid .bar { background: linear-gradient(to left, var(--bid-soft), transparent); }

.spread-row {
  display: flex; justify-content: space-between; align-items: center;
  margin: 7px 0; padding: 7px 10px;
  border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft);
  font-size: 12px; color: var(--faint);
}
.spread-row b { color: var(--txt); font-weight: 500; }

/* ── controls ───────────────────────────────────────────────────────── */
.flow-buttons { display: flex; gap: 8px; }
.slider-label {
  display: grid; grid-template-columns: 52px 1fr 92px; gap: 12px;
  align-items: center; font-size: 12.5px; color: var(--muted); margin: 6px 0 14px;
}
.slider-label .mono { text-align: right; font-size: 12px; }

.stat-row {
  display: flex; justify-content: space-between; gap: 10px;
  font-size: 12px; color: var(--muted);
  background: rgba(255, 255, 255, 0.5); border: 1px solid var(--border-soft);
  border-radius: 10px; padding: 10px 14px;
}
.stat-row b { color: var(--txt); font-weight: 500; display: block; font-size: 13.5px; }
.stat-row div { text-align: center; flex: 1; }

.divider { height: 1px; background: var(--border-soft); margin: 18px 0; }

.seg {
  display: grid; grid-template-columns: 1fr 1fr; gap: 4px;
  background: rgba(255, 255, 255, 0.5); border: 1px solid var(--border-soft);
  border-radius: 11px; padding: 4px; margin-bottom: 10px;
}
.seg-btn {
  border: none; border-radius: 8px; padding: 8px; cursor: pointer;
  font: 600 13px var(--sans); color: var(--muted); background: transparent;
  transition: background 0.15s, color 0.15s;
}
.seg-btn.active[data-side="buy"]  { background: var(--bid-soft); color: var(--bid); }
.seg-btn.active[data-side="sell"] { background: var(--ask-soft); color: var(--ask); }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-bottom: 10px; }

.feedback { margin-top: 10px; font-size: 12px; color: var(--muted); min-height: 18px; }
.feedback.ok { color: var(--bid); }
.feedback.warn { color: #b07514; }
.feedback.err { color: var(--ask); }

/* ── tape ───────────────────────────────────────────────────────────── */
.tape-card { flex: 1; }
.tape { list-style: none; max-height: 236px; overflow: hidden; font-size: 12.5px; }
.tape li {
  display: flex; justify-content: space-between;
  padding: 4px 4px; border-bottom: 1px solid var(--border-soft);
}
.tape li:last-child { border-bottom: none; }
.tape .buy  { color: var(--bid); }
.tape .sell { color: var(--ask); }
.tape .tq { color: var(--muted); }

/* ── depth chart ────────────────────────────────────────────────────── */
.depth-card { margin-top: 20px; }
#depthChart { width: 100%; height: 180px; display: block; }

/* ── sections ───────────────────────────────────────────────────────── */
.section-title {
  font-size: 24px; letter-spacing: -0.02em; font-weight: 700;
  margin: 88px 0 26px;
}

.research-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.ic-row { display: flex; gap: 14px; margin: 18px 0; }
.ic {
  flex: 1; text-align: center; padding: 16px 0;
  background: rgba(255, 255, 255, 0.5); border: 1px solid var(--border-soft);
  border-radius: 12px;
}
.ic b { display: block; font-size: 24px; font-weight: 600; color: var(--accent); }
.ic span { font-size: 11.5px; color: var(--faint); text-transform: uppercase; letter-spacing: 0.1em; }

.bench { width: 100%; border-collapse: collapse; font-size: 13px; margin: 6px 0 14px; }
.bench td { padding: 8px 4px; border-bottom: 1px solid var(--border-soft); }
.bench td:last-child { text-align: right; color: var(--accent); }
.bench tr:last-child td { border-bottom: none; }

.footnote { font-size: 12px; color: var(--faint); line-height: 1.6; }

/* ── footer ─────────────────────────────────────────────────────────── */
footer {
  position: relative; z-index: 1;
  max-width: 1120px; margin: 0 auto; padding: 26px 28px 40px;
  display: flex; justify-content: space-between;
  font-size: 12.5px; color: var(--faint);
  border-top: 1px solid var(--border-soft);
}
footer a { color: var(--muted); }

/* ── responsive ─────────────────────────────────────────────────────── */
@media (max-width: 920px) {
  .demo-grid, .research-grid { grid-template-columns: 1fr; }
}