:root {
  --bg: #050712;
  --bg-elevated: #0f101b;
  --bg-card: #11121f;
  --bg-card-soft: #151525;
  --border-soft: rgba(255, 255, 255, 0.08);
  --text-main: #f5f5f8;
  --text-muted: #a3a3ba;
  --accent-pink: #ff3b7d;
  --accent-gold: #ffc857;
  --accent-cyan: #35c4ff;
}

/* reset */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  min-height: 100%;
}

body {
  font-family: "Inter", -apple-system, system-ui, sans-serif;
  background: radial-gradient(circle at top left, #17182b 0, #050712 55%);
  color: var(--text-main);
}

/* HERO */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 5rem clamp(1.5rem, 5vw, 4rem);
  background: radial-gradient(circle at top right, #1c1024 0, #050712 60%);
}

.hero-inner {
  max-width: 920px;
}

.hero-kicker {
  font-size: 0.78rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.9rem, 6vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  font-weight: 800;
  margin-bottom: 1.2rem;
}

.hero-highlight {
  color: var(--accent-gold);
}

.hero-lede {
  font-size: 1.1rem;
  line-height: 1.8;
  max-width: 40rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.hero-song {
  color: var(--accent-pink);
  font-weight: 600;
}

.hero-credit {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 2.4rem;
}

.hero-meta-row {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1.4fr);
  gap: 1.5rem;
  max-width: 52rem;
}

.hero-meta-card {
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.03), rgba(5, 7, 18, 0.95));
  border-radius: 20px;
  padding: 1.4rem 1.6rem;
  border: 1px solid var(--border-soft);
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.55);
  backdrop-filter: blur(18px);
}

.meta-label {
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.8rem;
}

.meta-sparkline {
  height: 70px;
  margin-bottom: 0.5rem;
}

.meta-caption {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.meta-list {
  list-style: none;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.meta-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.1rem 0;
}

.meta-list span {
  opacity: 0.8;
}

.meta-list strong {
  font-weight: 600;
  color: var(--accent-gold);
}

/* PAGE LAYOUT */

.page {
  padding: 4rem clamp(1.5rem, 5vw, 4rem) 6rem;
  max-width: 1280px;
  margin: 0 auto;
}

/* CHAPTERS */

.chapter {
  padding: 4.5rem 0;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 550ms ease, transform 550ms ease;
}

.chapter.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.chapter + .chapter {
  border-top: 1px solid rgba(255, 255, 255, 0.04);
}

.chapter-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1.35fr);
  gap: 3.5rem;
  align-items: flex-start;
}

.chapter-final .chapter-grid {
  align-items: stretch;
}

.chapter-text {
  max-width: 640px;
}

.chapter-kicker {
  font-size: 0.8rem;
  letter-spacing: 0.21em;
  text-transform: uppercase;
  color: var(--accent-pink);
  margin-bottom: 1rem;
}

.chapter-title {
  font-size: 2.1rem;
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.5rem;
}

.chapter-body {
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.chapter-note {
  border-left: 3px solid var(--accent-gold);
  padding-left: 1rem;
  margin-top: 1.4rem;
}

.chapter-note p {
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--text-main);
}

/* CHART CARDS */

.chapter-chart {
  position: relative;
}

.chart-card {
  background: radial-gradient(circle at top left, #1b1b30, #0a0b14);
  border-radius: 26px;
  padding: 1.6rem 1.8rem 1.8rem;
  border: 1px solid var(--border-soft);
  box-shadow: 0 22px 60px rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(18px);
}

.chart-label {
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.45rem;
}

.chart-sub {
  font-size: 0.92rem;
  color: var(--text-muted);
  margin-bottom: 1.2rem;
}

.chart-wrapper {
  position: relative;
  height: 600px;
}



/* Final side by side charts */

.final-charts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.6rem;
}

.final-chart-card .chart-wrapper {
  height: 260px;
}

/* FOOTER */

.footer {
  padding: 3rem 1.5rem 4rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  text-align: center;
}

.footer-text {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* RESPONSIVE */

@media (max-width: 980px) {
  .hero {
    padding-top: 3.5rem;
    padding-bottom: 3.5rem;
  }

  .hero-meta-row {
    grid-template-columns: 1fr;
  }

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

  .chapter-chart {
    order: 2;
  }
}

@media (max-width: 640px) {
  .chart-wrapper {
    height: 280px;
  }

  .hero-title {
    font-size: 2.4rem;
  }

  .page {
    padding-inline: 1.25rem;
  }
}