:root {
  color-scheme: dark;
  --bg: #07131a;
  --bg-elevated: rgba(11, 29, 39, 0.88);
  --bg-subtle: rgba(11, 29, 39, 0.56);
  --surface: #102530;
  --surface-strong: #183746;
  --surface-soft: #13303f;
  --text: #eef7fb;
  --text-muted: #98b3c1;
  --text-soft: #bfd3dc;
  --accent: #63d2ff;
  --accent-strong: #2df1c1;
  --accent-warm: #ffd36a;
  --border: rgba(152, 179, 193, 0.18);
  --shadow: 0 20px 45px rgba(0, 0, 0, 0.28);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;
  --max-width: 1240px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  color: var(--text);
  overflow-x: hidden;
  background:
    radial-gradient(circle at top left, rgba(45, 241, 193, 0.12), transparent 25%),
    radial-gradient(circle at top right, rgba(99, 210, 255, 0.16), transparent 30%),
    linear-gradient(180deg, #08131a 0%, #0b1c25 100%);
}

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

select,
input,
button,
summary {
  font: inherit;
}

.page-shell {
  width: min(calc(100% - 2rem), var(--max-width));
  margin: 0 auto;
  padding: 2rem 0 3rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
  gap: var(--space-5);
  min-width: 0;
}

.content-stack {
  display: grid;
  gap: var(--space-4);
  min-width: 0;
}

.panel,
.card {
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

.panel {
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  min-width: 0;
}

.card {
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.panel--subtle {
  background: var(--bg-subtle);
}

.panel--sticky {
  position: sticky;
  top: 1rem;
  align-self: start;
}

.hero {
  margin-bottom: var(--space-5);
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -6rem -6rem auto;
  width: 240px;
  height: 240px;
  background: radial-gradient(circle, rgba(99, 210, 255, 0.18), transparent 70%);
  pointer-events: none;
}

.hero,
.hero__copy {
  position: relative;
}

.eyebrow {
  margin: 0 0 0.4rem;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Space Grotesk", system-ui, sans-serif;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(2.3rem, 4vw, 4rem);
  line-height: 0.98;
}

h2 {
  font-size: clamp(1.35rem, 2vw, 1.8rem);
}

h3 {
  font-size: 1.05rem;
  margin-bottom: 0.6rem;
}

.hero__subtitle,
.section-note,
.disclaimer-text,
.prose-card p,
.metric-card__hint,
.hero__meta-label,
.hero__meta-footnote {
  color: var(--text-muted);
}

.hero__subtitle {
  max-width: 60ch;
  font-size: 1.05rem;
  line-height: 1.65;
  margin: 1rem 0 0;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  align-items: end;
  margin-bottom: var(--space-4);
}

.section-note {
  max-width: 34ch;
  font-size: 0.95rem;
  line-height: 1.5;
  margin: 0;
}

.form-grid,
.advanced-grid {
  display: grid;
  gap: var(--space-3);
}

.field {
  display: grid;
  gap: 0.45rem;
}

.field span {
  color: var(--text-soft);
  font-size: 0.92rem;
}

.field input,
.field select {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(152, 179, 193, 0.2);
  background: rgba(7, 19, 26, 0.78);
  color: var(--text);
  padding: 0.8rem 0.95rem;
  outline: none;
  transition: border-color 180ms ease, transform 180ms ease, background 180ms ease;
}

.field input:focus,
.field select:focus {
  border-color: var(--accent);
  background: rgba(13, 34, 45, 0.95);
  transform: translateY(-1px);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border: 1px solid rgba(99, 210, 255, 0.28);
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(99, 210, 255, 0.18), rgba(45, 241, 193, 0.14));
  color: var(--text);
  padding: 0.78rem 1.1rem;
  text-decoration: none;
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background 180ms ease;
}

.button:hover,
.button:focus-visible {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(99, 210, 255, 0.26), rgba(45, 241, 193, 0.18));
  transform: translateY(-1px);
}

details summary {
  cursor: pointer;
  list-style: none;
  font-weight: 600;
}

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

details.panel {
  margin-top: var(--space-4);
}

details[open] summary {
  margin-bottom: var(--space-3);
}

.results-grid,
.formula-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-3);
}

.metric-card {
  min-height: 180px;
  display: grid;
  align-content: start;
  gap: 0.7rem;
  background:
    linear-gradient(180deg, rgba(24, 55, 70, 0.96), rgba(11, 29, 39, 0.92));
}

.metric-card__label {
  margin: 0;
  color: var(--text-soft);
  font-size: 0.92rem;
}

.metric-card__value {
  margin: 0;
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-size: clamp(1.6rem, 2vw, 2.3rem);
  font-weight: 700;
  line-height: 1.05;
}

.metric-card__hint {
  margin: 0;
  line-height: 1.5;
  font-size: 0.9rem;
}

.table-wrap {
  width: 100%;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 0.95rem 0.85rem;
  border-bottom: 1px solid var(--border);
}

.data-table th {
  color: var(--text-soft);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.data-table tbody tr:hover {
  background: rgba(99, 210, 255, 0.06);
}

.prose-card {
  background: rgba(16, 37, 48, 0.75);
}

.prose-card p {
  margin: 0.55rem 0 0;
  line-height: 1.6;
}

.chart-panel .chart-frame {
  min-height: 320px;
}

.disclaimer-text {
  max-width: 72ch;
  line-height: 1.7;
  margin: 0;
}

.is-hidden {
  display: none !important;
}

@media (max-width: 1080px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .panel--sticky {
    position: static;
  }

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

@media (max-width: 760px) {
  .page-shell {
    width: min(calc(100% - 1.2rem), var(--max-width));
    padding-top: 0.75rem;
  }

  .panel,
  .card {
    padding: var(--space-4);
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
  }

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

  .chart-panel .chart-frame {
    min-height: 260px;
  }

  .data-table {
    min-width: 520px;
  }
}