:root {
  --bg: #f6efe6;
  --bg-deep: #eadbc8;
  --panel: rgba(255, 251, 246, 0.82);
  --panel-strong: rgba(255, 248, 241, 0.94);
  --line: rgba(45, 34, 24, 0.12);
  --ink: #211b17;
  --muted: #6b5d52;
  --accent: #b45a28;
  --accent-soft: rgba(180, 90, 40, 0.16);
  --teal: #175b5c;
  --teal-soft: rgba(23, 91, 92, 0.14);
  --gold: #d5b168;
  --shadow: 0 28px 80px rgba(58, 38, 20, 0.12);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 18px;
  --font-display: "Fraunces", "Iowan Old Style", "Palatino Linotype", serif;
  --font-ui: "Instrument Sans", "Avenir Next", "Segoe UI", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-ui);
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.75), transparent 28%),
    radial-gradient(circle at 85% 12%, rgba(213, 177, 104, 0.22), transparent 20%),
    linear-gradient(180deg, #f9f3eb 0%, var(--bg) 52%, #f2e8dc 100%);
}

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

a {
  color: inherit;
}

.page-shell {
  width: min(1240px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 20px 0 48px;
  position: relative;
}

.page-shell::before,
.page-shell::after {
  content: "";
  position: fixed;
  inset: auto;
  pointer-events: none;
  z-index: 0;
}

.page-shell::before {
  width: 420px;
  height: 420px;
  top: -160px;
  right: -160px;
  background: radial-gradient(circle, rgba(180, 90, 40, 0.12), transparent 68%);
}

.page-shell::after {
  width: 360px;
  height: 360px;
  bottom: -140px;
  left: -120px;
  background: radial-gradient(circle, rgba(23, 91, 92, 0.12), transparent 68%);
}

.section,
.site-footer {
  position: relative;
  z-index: 1;
}

.section {
  margin-bottom: 28px;
  padding: clamp(28px, 5vw, 44px);
  background: var(--panel);
  border: 1px solid rgba(255, 255, 255, 0.55);
  box-shadow: var(--shadow);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(16px);
}

.hero {
  overflow: hidden;
}

.brand-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 40px;
}

.brand-mark,
.ghost-link {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
  font-size: 0.95rem;
}

.ghost-link {
  text-decoration: none;
}

.hero-grid,
.narrative-grid,
.calculator-grid {
  display: grid;
  gap: 28px;
}

.hero-grid,
.narrative-grid {
  grid-template-columns: minmax(0, 1.3fr) minmax(320px, 0.9fr);
  align-items: start;
}

.reverse {
  grid-template-columns: minmax(320px, 0.95fr) minmax(0, 1.25fr);
}

.eyebrow,
.panel-kicker,
.chart-kicker,
.decision-eyebrow,
.result-label {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--muted);
  margin: 0 0 10px;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.02;
}

h1 {
  font-size: clamp(3.2rem, 7vw, 6.6rem);
  max-width: 13ch;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  margin-bottom: 18px;
}

h3 {
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
}

p {
  margin: 0 0 16px;
  color: var(--muted);
  line-height: 1.7;
  font-size: 1.04rem;
}

.lede {
  font-size: 1.18rem;
  color: #493d34;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 28px 0 32px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--ink);
  color: #fff9f3;
}

.button-secondary {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.5);
}

.metric-row,
.results-grid,
.assumption-grid {
  display: grid;
  gap: 16px;
}

.metric-row {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.metric-card,
.result-card,
.assumption-card,
.insight-card,
.control-panel,
.formula-card,
.visual-card,
.decision-panel {
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--panel-strong);
}

.metric-card,
.result-card,
.assumption-card {
  padding: 20px;
}

.metric-label {
  display: block;
  margin-bottom: 10px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.metric-card strong,
.result-card strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.2;
}

.formula-card {
  padding: 28px;
  position: sticky;
  top: 20px;
  background:
    linear-gradient(180deg, rgba(255, 248, 240, 0.96), rgba(249, 239, 226, 0.88)),
    var(--panel-strong);
}

.equation-block {
  margin: 18px 0;
  padding: 18px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(45, 34, 24, 0.08);
}

.equation-block p {
  margin-bottom: 8px;
  font-size: 0.92rem;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.92rem;
  color: var(--ink);
}

.definition-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
}

.definition-list div {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 10px;
  align-items: start;
}

.definition-list dt {
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.definition-list dd {
  margin: 0;
  color: var(--muted);
}

.section-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.insight-card {
  padding: 18px 20px;
  margin-top: 12px;
  background: linear-gradient(135deg, rgba(180, 90, 40, 0.08), rgba(213, 177, 104, 0.1));
}

.insight-card span {
  color: var(--ink);
  font-weight: 700;
}

.visual-card {
  padding: 22px;
}

.chart-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
}

.chart-note {
  max-width: 30ch;
  font-size: 0.92rem;
  text-align: right;
}

.chart-frame {
  min-height: 320px;
  width: 100%;
}

.checklist {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.checklist div {
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
  color: #463b33;
}

.section-intro {
  max-width: 760px;
  margin-bottom: 28px;
}

.calculator-grid {
  grid-template-columns: minmax(280px, 0.78fr) minmax(0, 1.22fr);
  align-items: start;
}

.control-panel,
.results-panel {
  padding: 22px;
}

.control-panel {
  display: grid;
  gap: 16px;
}

.field {
  display: grid;
  gap: 10px;
}

.field span {
  color: #493d34;
  font-weight: 600;
  line-height: 1.4;
}

input[type="number"] {
  width: 100%;
  min-height: 54px;
  border-radius: 16px;
  border: 1px solid rgba(45, 34, 24, 0.12);
  background: rgba(255, 255, 255, 0.72);
  padding: 0 16px;
  font: inherit;
  color: var(--ink);
}

input[type="number"]:focus {
  outline: 2px solid rgba(180, 90, 40, 0.18);
  border-color: var(--accent);
}

.helper-text {
  padding: 14px 16px;
  border-radius: 16px;
  background: var(--teal-soft);
  color: #275556;
  font-size: 0.95rem;
  line-height: 1.6;
}

.results-panel {
  display: grid;
  gap: 18px;
}

.decision-panel {
  padding: 22px;
  background:
    radial-gradient(circle at top right, rgba(213, 177, 104, 0.22), transparent 28%),
    linear-gradient(135deg, rgba(255, 250, 243, 0.98), rgba(247, 239, 229, 0.94));
}

.decision-panel[data-tone="buy"] {
  background:
    radial-gradient(circle at top right, rgba(213, 177, 104, 0.16), transparent 28%),
    linear-gradient(135deg, rgba(244, 251, 246, 0.98), rgba(233, 246, 242, 0.94));
  border-color: rgba(23, 91, 92, 0.22);
}

.decision-panel[data-tone="skip"] {
  background:
    radial-gradient(circle at top right, rgba(180, 90, 40, 0.16), transparent 28%),
    linear-gradient(135deg, rgba(255, 248, 243, 0.98), rgba(250, 236, 228, 0.94));
  border-color: rgba(180, 90, 40, 0.22);
}

.decision-panel[data-tone="warn"] {
  background:
    radial-gradient(circle at top right, rgba(213, 177, 104, 0.18), transparent 28%),
    linear-gradient(135deg, rgba(255, 248, 239, 0.98), rgba(249, 239, 220, 0.94));
  border-color: rgba(213, 177, 104, 0.32);
}

.decision-panel h3 {
  margin-bottom: 10px;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
}

.results-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.result-card p {
  margin-top: 8px;
  margin-bottom: 0;
  font-size: 0.94rem;
}

.assumption-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.assumption-card h3 {
  margin-bottom: 10px;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 6px 0;
}

.site-footer p {
  margin: 0;
  font-size: 0.9rem;
}

.chart-svg text {
  font-family: var(--font-ui);
  fill: var(--muted);
}

.chart-svg .axis-line {
  stroke: rgba(45, 34, 24, 0.2);
  stroke-width: 1;
}

.chart-svg .grid-line {
  stroke: rgba(45, 34, 24, 0.08);
  stroke-width: 1;
}

.chart-svg .label-title {
  fill: var(--ink);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 1080px) {
  .hero-grid,
  .narrative-grid,
  .reverse,
  .calculator-grid,
  .metric-row,
  .assumption-grid {
    grid-template-columns: 1fr;
  }

  .formula-card {
    position: static;
  }

  .chart-head,
  .site-footer {
    flex-direction: column;
    align-items: start;
  }

  .chart-note {
    text-align: left;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100vw - 16px, 1240px);
    padding-top: 8px;
  }

  .section {
    padding: 20px;
    border-radius: 24px;
  }

  .brand-bar {
    margin-bottom: 28px;
  }

  h1 {
    max-width: 100%;
    font-size: clamp(2.8rem, 15vw, 4rem);
  }

  .hero-actions,
  .results-grid {
    grid-template-columns: 1fr;
  }

  .button {
    width: 100%;
  }
}