:root {
  --ink: #0B1420;
  --ink-2: #101D30;
  --ink-3: #16243a;
  --paper: #EDEAE0;
  --paper-dim: #A9B4C4;
  --brass: #C69749;
  --cryo: #5FD4D0;
  --ember: #E1573F;
  --line: #22304a;

  --font-display: "Fraunces", serif;
  --font-body: "Inter", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  line-height: 1.5;
}

a { color: var(--cryo); }

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 48px;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.02em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.wordmark-symbol { color: var(--cryo); }

.topbar-nav { display: flex; gap: 32px; }
.topbar-nav a {
  text-decoration: none;
  color: var(--paper-dim);
  font-size: 14px;
  font-family: var(--font-mono);
}
.topbar-nav a:hover { color: var(--cryo); }

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  padding: 72px 48px;
  align-items: center;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--brass);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 18px;
}

.hero-copy h1 {
  font-family: var(--font-display);
  font-size: 46px;
  font-weight: 500;
  line-height: 1.12;
  margin: 0 0 22px;
  letter-spacing: -0.01em;
}

.hero-copy h1 em {
  font-style: italic;
  color: var(--cryo);
}

.hero-sub {
  color: var(--paper-dim);
  font-size: 16px;
  max-width: 46ch;
  margin: 0 0 36px;
}

.hero-stats {
  display: flex;
  gap: 36px;
  flex-wrap: wrap;
}

.stat { display: flex; flex-direction: column; }
.stat-value {
  font-family: var(--font-mono);
  font-size: 26px;
  color: var(--brass);
}
.stat-label {
  font-size: 12px;
  color: var(--paper-dim);
  max-width: 16ch;
  margin-top: 4px;
}

.hero-visual {
  background: var(--ink-2);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 20px;
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cryo);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 12px;
}

.mono-caption {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--paper-dim);
  margin: 12px 0 0;
}

canvas { width: 100%; height: auto; display: block; }

/* ---------- Panels ---------- */
.panel {
  padding: 48px;
  border-top: 1px solid var(--line);
}

.panel-head h2 {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 28px;
  margin: 0 0 6px;
}

.panel-sub {
  color: var(--paper-dim);
  font-size: 14px;
  margin: 0 0 28px;
}

.legend {
  display: flex;
  gap: 24px;
  margin-top: 18px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--paper-dim);
}

.dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  margin-right: 6px;
}
.dot-baseline { background: var(--paper-dim); }
.dot-optimized { background: var(--cryo); }
.dot-buffer { background: var(--brass); }
.dot-risk { background: var(--ember); }

/* ---------- Controls ---------- */
.controls-panel {
  display: flex;
  align-items: center;
  gap: 40px;
  flex-wrap: wrap;
  background: var(--ink-2);
}

.control-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.control-group label {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--paper-dim);
}

input[type="range"] {
  accent-color: var(--cryo);
  width: 220px;
}

.mono-inline {
  font-family: var(--font-mono);
  color: var(--brass);
  font-size: 14px;
}

.btn-primary {
  font-family: var(--font-mono);
  background: var(--cryo);
  color: var(--ink);
  border: none;
  padding: 12px 22px;
  border-radius: 3px;
  font-size: 13px;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: opacity 0.15s ease;
}
.btn-primary:hover { opacity: 0.85; }
.btn-primary:focus-visible { outline: 2px solid var(--paper); outline-offset: 2px; }

/* ---------- Table ---------- */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th, td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}

th {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--paper-dim);
  font-weight: 500;
}

td.mono { font-family: var(--font-mono); }

.tag {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 3px;
  display: inline-block;
}
.tag-discount { background: rgba(95, 212, 208, 0.15); color: var(--cryo); }
.tag-penalty { background: rgba(225, 87, 63, 0.15); color: var(--ember); }
.tag-same { background: rgba(169, 180, 196, 0.12); color: var(--paper-dim); }

/* ---------- How it works ---------- */
.how-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.how-card {
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 20px;
  background: var(--ink-2);
}

.how-index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--brass);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 10px;
}

.how-card p {
  font-size: 14px;
  color: var(--paper-dim);
  margin: 0;
  line-height: 1.55;
}

/* ---------- Footer ---------- */
.footer {
  padding: 28px 48px;
  border-top: 1px solid var(--line);
  color: var(--paper-dim);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding: 48px 24px; }
  .panel { padding: 36px 24px; }
  .how-grid { grid-template-columns: 1fr 1fr; }
  .topbar { padding: 18px 24px; }
  .hero-copy h1 { font-size: 34px; }
}

@media (max-width: 560px) {
  .how-grid { grid-template-columns: 1fr; }
  .topbar-nav { display: none; }
}

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