:root {
  /* Colors */
  --color-paper-white: #ffffff;
  --color-ink-black: #000000;
  --color-carbon: #181818;
  --color-ash: #6d6d6d;
  --color-smoke: #9a9a9a;
  --color-pewter: #808080;
  --color-graphite: #636363;

  /* Typography — Font Families */
  --font-roobert: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  /* Typography — Weights */
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-semibold: 600;

  /* Spacing */
  --spacing-8: 8px;
  --spacing-12: 12px;
  --spacing-28: 28px;
  --spacing-40: 40px;
  --spacing-48: 48px;
  --spacing-64: 64px;
  --spacing-68: 68px;
  --spacing-152: 152px;

  /* Layout */
  --page-max-width: 1440px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: var(--font-roobert);
  font-weight: var(--font-weight-regular);
  color: var(--color-paper-white);
  background: var(--color-ink-black);
  line-height: 1.39;
  overflow-x: hidden;
}

html {
  scroll-behavior: smooth;
}

/* Logo */
.logo {
  position: fixed;
  top: var(--spacing-28);
  left: var(--spacing-48);
  font-size: 12px;
  font-weight: var(--font-weight-regular);
  color: var(--color-paper-white);
  z-index: 1000;
  mix-blend-mode: difference;
}

/* Visual Sections */
.visual-section {
  position: relative;
  width: 100%;
  height: 100vh;
  overflow: hidden;
  background: var(--color-ink-black);
}

canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.visual-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 10;
}

.visual-title {
  font-size: clamp(60px, 12vw, 225px);
  font-weight: var(--font-weight-light);
  color: var(--color-paper-white);
  line-height: 0.76;
  letter-spacing: normal;
  white-space: pre-line;
  text-align: center;
  text-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
}

.visual-subtitle {
  font-size: clamp(45px, 8vw, 94px);
  font-weight: var(--font-weight-light);
  color: var(--color-paper-white);
  line-height: 1.1;
  letter-spacing: normal;
  white-space: pre-line;
  text-align: center;
  text-shadow: 0 0 40px rgba(0, 0, 0, 0.5);
}

/* Speed Metrics */
.speed-metrics {
  display: flex;
  gap: var(--spacing-64);
  margin-top: var(--spacing-64);
}

.metric {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-8);
}

.metric-value {
  font-size: clamp(54px, 6vw, 78px);
  font-weight: var(--font-weight-light);
  color: var(--color-paper-white);
  line-height: 1;
}

.metric-x {
  font-size: clamp(36px, 4vw, 54px);
  font-weight: var(--font-weight-light);
  color: var(--color-paper-white);
  line-height: 1;
}

.metric-label {
  font-size: 12px;
  font-weight: var(--font-weight-regular);
  color: var(--color-ash);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Explanation Section */
.explanation-section {
  position: relative;
  min-height: 100vh;
  background: var(--color-paper-white);
  padding: 120px var(--spacing-48);
  display: flex;
  align-items: center;
  justify-content: center;
}

.explanation-content {
  max-width: 900px;
  margin: 0 auto;
}

.explanation-title {
  font-size: clamp(45px, 6vw, 78px);
  font-weight: var(--font-weight-light);
  color: var(--color-carbon);
  line-height: 1.15;
  margin-bottom: var(--spacing-64);
}

.explanation-text {
  font-size: 18px;
  font-weight: var(--font-weight-regular);
  color: var(--color-carbon);
  line-height: 1.58;
  margin-bottom: var(--spacing-40);
}

.explanation-footer {
  margin-top: var(--spacing-64);
  padding-top: var(--spacing-40);
  border-top: 1px solid var(--color-smoke);
}

.explanation-status {
  font-size: 16px;
  font-weight: var(--font-weight-regular);
  color: var(--color-ash);
  text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
  .logo {
    left: var(--spacing-28);
  }

  .speed-metrics {
    flex-direction: column;
    gap: var(--spacing-40);
  }

  .explanation-section {
    padding: var(--spacing-64) var(--spacing-28);
  }
}

/* Smooth Scrolling */
html {
  scroll-behavior: smooth;
}