:root {
  color-scheme: dark;
  --bg-gradient: radial-gradient(circle at 20% 20%, #1f2937 0%, #0f172a 45%, #020617 100%);
  --surface: rgba(15, 23, 42, 0.75);
  --surface-accent: rgba(15, 118, 143, 0.2);
  --text-primary: #f8fafc;
  --text-secondary: #cbd5f5;
  --accent: #38bdf8;
  --accent-strong: #f472b6;
  --border: rgba(148, 163, 184, 0.2);
  --shadow: 0 24px 48px rgba(15, 23, 42, 0.45);
  --container: min(1120px, calc(100% - 48px));
}

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

body {
  margin: 0;
  font-family: 'Noto Sans SC', 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-gradient);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

h1,
h2,
h3 {
  color: #ffffff;
  line-height: 1.2;
  margin: 0 0 0.6em;
}

p {
  margin: 0 0 1em;
}

ul {
  margin: 0;
  padding-left: 1.2em;
  color: var(--text-secondary);
}

.hero {
  padding: 88px 0 48px;
  display: flex;
  justify-content: center;
}

.hero__content {
  width: var(--container);
  display: grid;
  gap: 24px;
  background: linear-gradient(135deg, rgba(30, 64, 175, 0.35), rgba(59, 130, 246, 0.15));
  border: 1px solid rgba(96, 165, 250, 0.2);
  border-radius: 28px;
  padding: 48px 64px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  margin: 0;
}

.hero h1 {
  font-size: clamp(2.4rem, 4.5vw, 3.6rem);
  font-weight: 700;
}

.hero__lead {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 720px;
}

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.stat-card {
  flex: 1 1 200px;
  background: rgba(15, 23, 42, 0.55);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 20px;
  padding: 20px 24px;
  display: grid;
  gap: 6px;
}

.stat-card__label {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.stat-card__value {
  font-size: 2.6rem;
  font-weight: 700;
  color: #e0f2fe;
  line-height: 1;
}

.stat-card__hint {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

main {
  display: grid;
  gap: 72px;
  padding: 0 0 112px;
}

.section {
  display: flex;
  justify-content: center;
  padding: 0 0 0;
}

.section--accent {
  background: rgba(14, 116, 144, 0.12);
  padding: 72px 0;
  border-block: 1px solid rgba(56, 189, 248, 0.12);
}

.section__header {
  width: var(--container);
  margin-bottom: 24px;
  display: grid;
  gap: 12px;
}

.section__eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-strong);
}

.visual-wrapper {
  position: relative;
  width: var(--container);
  aspect-ratio: 16 / 9;
  border-radius: 28px;
  border: 1px solid var(--border);
  overflow: hidden;
  background: linear-gradient(140deg, rgba(15, 23, 42, 0.8), rgba(15, 23, 42, 0.45));
  box-shadow: var(--shadow);
  margin-bottom: 32px;
}

.visual {
  width: 100%;
  height: 100%;
  display: block;
  position: relative;
  z-index: 1;
}

.visual-placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 24px;
  text-align: center;
  font-size: 0.94rem;
  color: var(--text-secondary);
  background: radial-gradient(circle at 20% 20%, rgba(15, 23, 42, 0.9), rgba(2, 6, 23, 0.92));
  letter-spacing: 0.02em;
  transition: opacity 0.4s ease;
  z-index: 2;
}

.visual-wrapper[data-ready='true'] .visual-placeholder {
  opacity: 0;
  pointer-events: none;
}

.visual-wrapper[data-ready='error'] .visual-placeholder {
  opacity: 1;
  pointer-events: auto;
  color: #fda4af;
}

.visual-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 12px;
  background: linear-gradient(180deg, rgba(2, 6, 23, 0) 20%, rgba(2, 6, 23, 0.55) 100%);
}

.slider {
  display: inline-flex;
  flex-direction: column;
  gap: 8px;
  align-self: flex-start;
  background: rgba(15, 23, 42, 0.65);
  border: 1px solid rgba(148, 163, 184, 0.25);
  border-radius: 16px;
  padding: 12px 16px;
  pointer-events: auto;
  backdrop-filter: blur(12px);
}

.slider span {
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.slider input[type='range'] {
  width: clamp(180px, 24vw, 260px);
  accent-color: var(--accent);
}

.overlay-hint {
  max-width: 420px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  pointer-events: none;
}

.insight-grid,
.summary-grid {
  width: var(--container);
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.insight-card,
.summary-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 24px 28px;
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.35);
  backdrop-filter: blur(12px);
}

.insight-card h3,
.summary-card h3 {
  font-size: 1.25rem;
  margin-bottom: 12px;
  color: #e0f2fe;
}

.insight-card p,
.summary-card li {
  color: var(--text-secondary);
  font-size: 0.98rem;
}

.summary-card strong {
  color: var(--accent);
}

.footer {
  padding: 48px 0 64px;
  text-align: center;
  color: rgba(226, 232, 240, 0.65);
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  :root {
    --container: calc(100% - 32px);
  }

  .hero__content {
    padding: 36px 28px;
  }

  .visual-wrapper {
    border-radius: 22px;
  }
}

@media (max-width: 640px) {
  main {
    gap: 56px;
  }

  .hero {
    padding: 64px 0 32px;
  }

  .hero__lead {
    font-size: 0.98rem;
  }

  .visual-wrapper {
    aspect-ratio: 4 / 3;
  }

  .visual-overlay {
    padding: 18px;
  }

  .slider input[type='range'] {
    width: clamp(160px, 50vw, 220px);
  }
}