:root {
  --bg: #0b0d10;
  --panel: #14171c;
  --border: #232830;
  --text: #e8ecf1;
  --muted: #8c95a3;
  --action: #4a9eff;
  --green: #6cc86c;
  --amber: #d4a04a;
  --red: #ff6b6b;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  line-height: 1.55;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

header.hero { padding: 64px 32px 24px; max-width: 1200px; margin: 0 auto; }
.hero-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 48px; align-items: end; }
h1 { font-size: 40px; margin: 0 0 12px; letter-spacing: -0.025em; font-weight: 600; }
.subtitle { color: var(--muted); font-size: 16px; max-width: 560px; margin: 0; line-height: 1.6; }
.hero-stat { text-align: right; }
.big-number {
  font-family: 'ui-monospace', SFMono-Regular, Menlo, monospace;
  font-size: 52px;
  font-weight: 600;
  color: var(--green);
  letter-spacing: -0.025em;
  line-height: 1.05;
}
.big-number.small { font-size: 28px; }
.big-number.green { color: var(--green); }
.label { color: var(--muted); font-size: 13px; margin-top: 6px; }
.pill {
  display: inline-block;
  margin-top: 12px;
  padding: 6px 14px;
  background: rgba(74,158,255,0.08);
  border: 1px solid rgba(74,158,255,0.25);
  border-radius: 999px;
  font-size: 12px;
  color: var(--action);
  font-weight: 500;
}
.hero-chart { margin-top: 36px; height: 340px; }

section.panel {
  max-width: 1200px;
  margin: 36px auto;
  padding: 32px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
}
section.panel h2 { margin: 0 0 8px; font-size: 22px; font-weight: 600; letter-spacing: -0.01em; }
section.panel > p.muted { margin: 0 0 20px; }

.controls.sticky {
  position: sticky; top: 16px; z-index: 10;
  max-width: 1200px; margin: 24px auto;
  padding: 22px 24px;
  background: rgba(20,23,28,0.94);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border); border-radius: 12px;
  display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px;
  align-items: end;
}
.control label {
  display: block;
  font-size: 11px;
  color: var(--muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
}
.control select, .control input[type=number] {
  width: 100%;
  padding: 9px 12px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
}
.control input[type=range] { width: 100%; accent-color: var(--action); }

.switch { position: relative; display: inline-block; width: 44px; height: 24px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; inset: 0; background: var(--border); border-radius: 24px; transition: 0.2s; }
.slider:before {
  position: absolute; content: ""; height: 18px; width: 18px; left: 3px; top: 3px;
  background: var(--text); border-radius: 50%; transition: 0.2s;
}
.switch input:checked + .slider { background: var(--action); }
.switch input:checked + .slider:before { transform: translateX(20px); }

.chart-wrap { position: relative; height: 280px; }
.chart-wrap.small-chart { height: 180px; }

.dual { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.dual h3 { font-size: 13px; color: var(--muted); margin: 0 0 12px; text-transform: uppercase; letter-spacing: 0.06em; font-weight: 500; }
.dual-stats {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px;
  margin-top: 24px; padding-top: 24px; border-top: 1px solid var(--border);
}

.calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: center; }
.calc-grid input {
  width: 100%; padding: 9px 12px; margin-bottom: 14px;
  background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 6px;
  font-size: 14px; font-family: inherit;
}
.calc-grid label {
  display: block; font-size: 11px; color: var(--muted); margin-bottom: 6px;
  text-transform: uppercase; letter-spacing: 0.06em; font-weight: 500;
}
.calc-output { text-align: center; padding-left: 24px; border-left: 1px solid var(--border); }
.calc-output .big-number { font-size: 44px; }

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

.methodology { color: var(--muted); }
.methodology h3 { color: var(--text); margin-top: 22px; margin-bottom: 8px; font-size: 15px; font-weight: 600; }
.methodology ul { padding-left: 22px; }
.methodology li { margin-bottom: 6px; }
.methodology b { color: var(--text); font-weight: 500; }

.v2-list { padding-left: 22px; color: var(--muted); }
.v2-list li { margin-bottom: 10px; }
.v2-list b { color: var(--text); font-weight: 500; }
.cta { font-size: 15px; color: var(--text); margin-top: 24px; }
.cta a { color: var(--action); text-decoration: none; font-weight: 500; }
.cta a:hover { text-decoration: underline; }

footer {
  max-width: 1200px; margin: 56px auto 40px; padding: 28px 32px;
  border-top: 1px solid var(--border);
  color: var(--muted); font-size: 13px;
  display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
footer a { color: var(--muted); text-decoration: none; }
footer a:hover { color: var(--text); }

details { margin-top: 4px; }
details summary { cursor: pointer; color: var(--text); font-weight: 500; margin-bottom: 18px; list-style: none; }
details summary::before { content: "▸ "; color: var(--muted); }
details[open] summary::before { content: "▾ "; }

@media (max-width: 800px) {
  header.hero { padding: 40px 20px 20px; }
  h1 { font-size: 30px; }
  .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .hero-stat { text-align: left; }
  .big-number { font-size: 40px; }
  .controls.sticky { grid-template-columns: 1fr 1fr; padding: 18px; }
  section.panel { padding: 22px 20px; margin: 24px 12px; }
  .dual, .calc-grid { grid-template-columns: 1fr; }
  .dual-stats { grid-template-columns: 1fr; gap: 18px; }
  .calc-output { padding-left: 0; border-left: none; border-top: 1px solid var(--border); padding-top: 24px; }
  footer { padding: 22px 20px; }
}