:root {
  --page-bg: #06141c;
  --panel: rgba(8, 26, 36, 0.78);
  --panel-strong: rgba(10, 31, 42, 0.96);
  --border: rgba(140, 191, 182, 0.16);
  --text: #ebf8f4;
  --muted: #a7bdb7;
  --accent: #54d4a7;
  --accent-strong: #30b784;
  --secondary: #5fd8ff;
  --shadow: 0 30px 70px rgba(0, 0, 0, 0.24);
  font-family: "Inter", "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(84, 212, 167, 0.2), transparent 28%),
    radial-gradient(circle at top right, rgba(95, 216, 255, 0.14), transparent 22%),
    linear-gradient(180deg, #071219 0%, var(--page-bg) 100%);
  color: var(--text);
}

.page-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px 72px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(280px, 360px);
  gap: 24px;
  margin-bottom: 24px;
}

.hero-copy,
.hero-panel,
.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero-copy {
  padding: 30px;
}

.hero-panel,
.card {
  padding: 24px;
}

.eyebrow,
.panel-label,
.step {
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
}

h1,
h2,
p,
ul {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.4rem, 5vw, 4rem);
  line-height: 0.96;
  margin-bottom: 16px;
  max-width: 11ch;
}

.lede,
.chart-note,
.metric-list,
.prediction-summary {
  color: var(--muted);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  transition: transform 160ms ease, opacity 160ms ease;
}

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

.button-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #032016;
}

.button-secondary {
  background: rgba(95, 216, 255, 0.12);
  color: var(--secondary);
  border: 1px solid rgba(95, 216, 255, 0.18);
}

.fact-list,
.metric-list {
  padding-left: 18px;
  display: grid;
  gap: 12px;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.section-heading {
  margin-bottom: 18px;
}

.section-heading h2 {
  margin-bottom: 0;
  font-size: 1.3rem;
}

.chart-card,
.predictor-card {
  grid-column: span 2;
}

#chart {
  width: 100%;
  height: auto;
  background: var(--panel-strong);
  border-radius: 20px;
  overflow: hidden;
}

#chart rect {
  fill: rgba(6, 20, 28, 0.66);
}

#grid-lines line,
#axis-labels text {
  stroke: rgba(167, 189, 183, 0.18);
  fill: var(--muted);
  font-size: 12px;
}

#chart-line {
  stroke: var(--accent);
  stroke-width: 4;
}

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

.control,
.toggle {
  display: grid;
  gap: 10px;
}

.control span,
.toggle span {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.control strong {
  color: var(--text);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.toggle-button {
  border: 1px solid rgba(84, 212, 167, 0.22);
  background: rgba(84, 212, 167, 0.08);
  color: var(--text);
  border-radius: 999px;
  padding: 12px 16px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  width: fit-content;
}

.toggle-button.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #032016;
}

.prediction-wrap {
  display: grid;
  gap: 16px;
}

.prediction-value {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

#prediction-number {
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.05em;
}

.prediction-unit {
  font-size: 1.2rem;
  color: var(--muted);
}

@media (max-width: 920px) {
  .hero,
  .content-grid,
  .control-grid {
    grid-template-columns: 1fr;
  }

  .chart-card,
  .predictor-card {
    grid-column: auto;
  }

  .page-shell {
    padding: 20px 14px 48px;
  }

  h1 {
    max-width: none;
  }
}