:root {
  color-scheme: light;
  --bg: #FBFAF7;
  --text: #0B121A;
  --graphite: #2C343C;
  --gold: #E5AC4C;
  --muted: #5F656B;
  --line: #D4D8DD;
  --secondary-line: #B9BEC4;
  --surface: #FFFFFF;
  --soft-shadow: 0 18px 46px rgb(44 52 60 / 10%);
  --radius: 8px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Manrope, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
}

a { color: inherit; }

.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgb(251 250 247 / 92%);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.topbar-inner {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
  letter-spacing: 0;
}

.brand-mark {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--graphite);
  box-shadow: inset 0 0 0 7px var(--gold);
}

.nav {
  display: flex;
  gap: 18px;
  align-items: center;
  font-size: 14px;
  color: var(--muted);
}

.nav a { text-decoration: none; }

.tool-hero { padding: 52px 0 26px; }

.tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 390px);
  gap: 40px;
  align-items: start;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  color: var(--graphite);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
}

h1 {
  max-width: 760px;
  margin: 0;
  color: var(--text);
  font-size: clamp(32px, 5vw, 50px);
  line-height: 1.04;
  letter-spacing: 0;
}

h1 span { color: var(--gold); }

.lead {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.62;
}

.facts {
  display: grid;
  gap: 12px;
  margin-top: 30px;
}

.fact {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--graphite);
  font-size: 15px;
  line-height: 1.55;
}

.fact span {
  flex: 0 0 auto;
  width: 24px;
  height: 24px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  color: var(--text);
  background: var(--gold);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  font-weight: 800;
}

.result-panel {
  position: sticky;
  top: 88px;
  padding: 24px;
  color: #FFFFFF;
  background: var(--graphite);
  border-radius: var(--radius);
  box-shadow: var(--soft-shadow);
}

.result-label {
  color: rgb(255 255 255 / 72%);
  font-size: 13px;
}

.result-value {
  margin-top: 10px;
  color: var(--gold);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: clamp(27px, 3vw, 36px);
  font-weight: 800;
  line-height: 1.08;
}

.result-note {
  margin: 14px 0 0;
  color: rgb(255 255 255 / 76%);
  line-height: 1.55;
}

.bar-stack {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.bar-row { display: grid; gap: 7px; }

.bar-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: rgb(255 255 255 / 78%);
  font-size: 13px;
}

.bar-top strong {
  color: #FFFFFF;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  text-align: right;
}

.bar-track {
  height: 8px;
  overflow: hidden;
  background: rgb(255 255 255 / 14%);
  border-radius: 999px;
}

.bar-fill {
  display: block;
  height: 100%;
  width: 0;
  background: #FFFFFF;
  border-radius: inherit;
  transition: width .2s ease;
}

.bar-fill.is-risk { background: var(--gold); }

.tool-body { padding: 26px 0 72px; }

.calculator {
  display: grid;
  grid-template-columns: minmax(0, .98fr) minmax(360px, 1fr);
  gap: 26px;
  align-items: start;
}

.input-panel,
.breakdown-panel,
.formula-panel,
.faq-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.input-panel,
.breakdown-panel,
.formula-panel { padding: 24px; }

.input-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

label {
  display: grid;
  gap: 8px;
  color: var(--text);
  font-size: 14px;
  font-weight: 700;
}

input {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  color: var(--text);
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font: 600 17px/1.2 "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

input:focus {
  outline: 2px solid rgb(229 172 76 / 38%);
  outline-offset: 2px;
  border-color: var(--gold);
}

input[type="range"] {
  min-height: 36px;
  padding: 0;
  accent-color: var(--gold);
}

.field-meta {
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.45;
}

.loss-percent-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.loss-percent-value {
  color: var(--gold);
  font: 800 20px/1 "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

.breakdown-panel h2,
.formula-panel h2,
.faq h2 {
  margin: 0 0 18px;
  color: var(--text);
  font-size: 24px;
  letter-spacing: 0;
}

.metric-list {
  display: grid;
  gap: 0;
}

.metric {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.metric:last-child { border-bottom: 0; }

.metric span { color: var(--muted); }

.metric strong {
  color: var(--text);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 15px;
  text-align: right;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.btn {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  font: 800 14px/1.2 Manrope, system-ui, sans-serif;
  letter-spacing: 0;
  text-decoration: none;
}

.btn-primary {
  color: #FFFFFF;
  background: var(--graphite);
  box-shadow: 0 10px 24px rgb(44 52 60 / 16%);
}

.btn-secondary {
  color: var(--text);
  background: var(--bg);
  border-color: var(--secondary-line);
}

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

.copy-status {
  min-height: 20px;
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.formula-panel { margin-top: 26px; }

.formula-code {
  display: block;
  padding: 14px;
  color: #FFFFFF;
  background: var(--graphite);
  border-radius: var(--radius);
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 13px;
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.formula-panel p {
  margin: 14px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.faq { margin-top: 34px; }

.faq-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.faq-item { padding: 20px; }

.faq-item h3 {
  margin: 0 0 10px;
  color: var(--text);
  font-size: 17px;
}

.faq-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.56;
}

.footer {
  padding: 28px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 920px) {
  .tool-grid,
  .calculator,
  .faq-grid {
    grid-template-columns: 1fr;
  }

  .result-panel { position: static; }
}

@media (max-width: 680px) {
  .container { width: min(100% - 24px, 1120px); }

  .nav { display: none; }

  .tool-hero { padding-top: 34px; }

  .input-grid { grid-template-columns: 1fr; }

  .input-panel,
  .breakdown-panel,
  .formula-panel,
  .faq-item,
  .result-panel {
    padding: 18px;
  }

  .result-value { font-size: 28px; }

  .metric {
    display: grid;
    gap: 4px;
  }

  .metric strong { text-align: left; }

  .btn { width: 100%; }
}