:root {
  --bg: #07141c;
  --bg-raise: #0d1e2a;
  --card: rgba(16, 36, 50, 0.92);
  --ink: #e7eef3;
  --muted: #9aafbd;
  --line: rgba(176, 206, 222, 0.16);
  --cyan: #6ee0c8;
  --cyan-deep: #123f3a;
  --bid: #3cba78;
  --ask: #e36d6d;
  --sand: #e4c27a;
  --sand-ink: #2a2112;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.28);
  --radius: 18px;
  --max: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Source Sans 3", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 420px at 90% -10%, rgba(110, 224, 200, 0.12), transparent 55%),
    radial-gradient(700px 380px at -10% 20%, rgba(227, 109, 109, 0.08), transparent 50%),
    var(--bg);
  line-height: 1.6;
  font-size: 1.05rem;
}

img,
svg {
  max-width: 100%;
}

a {
  color: var(--cyan);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

a:hover {
  color: #d8fff4;
}

.skip {
  position: absolute;
  left: 0.75rem;
  top: -3rem;
  background: var(--cyan);
  color: #04221c;
  padding: 0.45rem 0.75rem;
  z-index: 6;
  border-radius: 8px;
}

.skip:focus {
  top: 0.75rem;
}

.wrap {
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
}

.narrow {
  width: min(760px, calc(100% - 2rem));
  margin: 0 auto;
}

.disclosure {
  background: #1c2830;
  color: #d5e2ea;
  font-size: 0.92rem;
  border-bottom: 1px solid var(--line);
}

.disclosure p,
.footer p {
  margin: 0;
}

.disclosure .wrap,
.footer .wrap {
  padding: 0.75rem 0;
}

.top {
  position: sticky;
  top: 0;
  z-index: 4;
  backdrop-filter: blur(16px);
  background: rgba(7, 20, 28, 0.82);
  border-bottom: 1px solid var(--line);
}

.top-inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  min-height: 64px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
  justify-content: center;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}

nav a:hover,
nav a:focus-visible {
  color: var(--ink);
}

.hero {
  padding: 4.2rem 0 2rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.2rem;
  align-items: center;
}

.kicker {
  margin: 0 0 0.8rem;
  color: var(--cyan);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4 {
  font-family: "Sora", "Segoe UI", sans-serif;
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.03em;
}

h1 {
  margin: 0 0 1rem;
  font-size: clamp(2.2rem, 4.6vw, 3.7rem);
}

h2 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
}

h3 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
}

.lede {
  margin: 0;
  color: #c5d4de;
  font-size: 1.18rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0.65rem 1.05rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--cyan);
  color: #05241e;
}

.btn-primary:hover {
  background: #bffff0;
  color: #05241e;
}

.btn-ghost {
  border-color: var(--line);
  color: var(--ink);
  background: transparent;
}

.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--ink);
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.4rem;
}

.meta span,
.pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.25rem 0.7rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.ladder {
  position: relative;
  height: 390px;
  border-radius: 22px;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(227, 109, 109, 0.16), rgba(7, 20, 28, 0.2) 42%, rgba(60, 186, 120, 0.16)),
    repeating-linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.025) 0 1px,
      transparent 1px 28px
    ),
    #0a1822;
  box-shadow: var(--shadow);
}

.band {
  position: absolute;
  left: 0;
  right: 0;
  height: 28px;
  opacity: 0.85;
}

.ask {
  background: linear-gradient(90deg, rgba(227, 109, 109, 0.15), rgba(227, 109, 109, 0.72) 18%, rgba(227, 109, 109, 0.2));
}

.bid {
  background: linear-gradient(90deg, rgba(60, 186, 120, 0.12), rgba(60, 186, 120, 0.7) 30%, rgba(60, 186, 120, 0.18));
}

.a1 { top: 18%; width: 78%; }
.a2 { top: 28%; width: 54%; opacity: 0.55; }
.b1 { top: 62%; width: 86%; }
.b2 { top: 74%; width: 46%; opacity: 0.6; }

.trace {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.trace polyline {
  fill: none;
  stroke: #d8fff6;
  stroke-width: 2.4;
  stroke-linejoin: round;
  stroke-linecap: round;
}

.tag {
  position: absolute;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.28rem 0.45rem;
  border-radius: 6px;
  background: rgba(5, 14, 20, 0.78);
  border: 1px solid var(--line);
}

.tag-ask { top: 12%; left: 1rem; color: #ffc9c9; }
.tag-print { top: 46%; right: 1rem; color: var(--sand); }
.tag-bid { top: 80%; left: 1rem; color: #c9ffe2; }

.ladder-foot {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.7rem;
  color: var(--muted);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.75rem;
}

.section,
.tabs,
.faq details {
  scroll-margin-top: 5.5rem;
}

.section {
  padding: 3.2rem 0;
}

.intro {
  color: #c9d6df;
  font-size: 1.08rem;
  margin: 0 0 1.4rem;
}

.grid-3,
.grid-2 {
  display: grid;
  gap: 1rem;
}

.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card,
.panel,
.faq details,
.note {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.2rem;
}

.card p,
.panel p,
.faq p,
.note p {
  margin: 0;
  color: #d5e0e7;
}

.index {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  color: var(--cyan);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 0.45rem;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 1rem;
}

.tabs button {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  font: inherit;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  cursor: pointer;
}

.tabs button[aria-selected="true"] {
  background: var(--cyan);
  color: #05241e;
  border-color: var(--cyan);
}

.tabs button:focus-visible,
.btn:focus-visible,
nav a:focus-visible,
.faq summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.panel h3 {
  font-size: 1.35rem;
}

.steps {
  display: grid;
  gap: 0.8rem;
}

.step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.9rem;
  align-items: start;
}

.num {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  color: var(--sand);
  font-size: 0.95rem;
  padding-top: 0.15rem;
}

.note {
  background: #241d12;
  border-color: rgba(228, 194, 122, 0.35);
  margin-top: 1rem;
}

.stack {
  margin-top: 0.8rem;
}

.note strong {
  color: var(--sand);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.98rem;
}

th,
td {
  text-align: left;
  vertical-align: top;
  padding: 0.85rem 0.75rem;
  border-bottom: 1px solid var(--line);
}

th {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(10, 24, 34, 0.65);
}

.faq details {
  padding: 0;
  margin-bottom: 0.7rem;
}

.faq summary {
  cursor: pointer;
  padding: 0.95rem 1.1rem;
  font-family: "Sora", sans-serif;
  font-weight: 600;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq details p {
  padding: 0 1.1rem 1rem;
}

.footer {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.footer nav {
  justify-content: flex-end;
}

.legal {
  padding: 2.5rem 0 4rem;
}

.legal h1 {
  font-size: clamp(2rem, 4vw, 2.8rem);
}

.legal h2 {
  font-size: 1.35rem;
  margin-top: 1.8rem;
}

.back {
  display: inline-block;
  margin-bottom: 1rem;
}

.legal ul {
  margin: 0.4rem 0 0;
  padding-left: 1.1rem;
  color: #d5e0e7;
}

@media (max-width: 860px) {
  .hero-grid,
  .grid-3,
  .grid-2 {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 2.4rem;
  }

  .ladder {
    height: 320px;
  }

  .top-inner {
    justify-content: center;
    padding: 0.7rem 0;
  }

  nav {
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}