:root {
  --bf-color-text: #1a1a2e;
  --bf-color-muted: #565673;
  --bf-color-border: #e4e4ef;
  --bf-color-bg: #ffffff;
  --bf-color-bg-alt: #f6f6fb;
  --bf-color-surface: #ffffff;
  --bf-color-accent: #5b3df6;
  --bf-color-accent-dark: #4029c9;
  --bf-color-accent-2: #17b6a7;
  --bf-color-on-accent: #ffffff;
  --bf-space: 1rem;
  --bf-max-width: 68rem;
  --bf-radius: 0.75rem;
  --bf-shadow: 0 1px 2px rgba(26, 26, 46, 0.06), 0 8px 24px -12px rgba(26, 26, 46, 0.18);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bf-color-text: #edf0ff;
    --bf-color-muted: #a7abd6;
    --bf-color-border: #2c2c48;
    --bf-color-bg: #100f1e;
    --bf-color-bg-alt: #17172c;
    --bf-color-surface: #1b1a33;
    --bf-color-accent: #8a7bff;
    --bf-color-accent-dark: #a598ff;
    --bf-color-accent-2: #35d4c4;
    --bf-color-on-accent: #100f1e;
    --bf-shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px -12px rgba(0, 0, 0, 0.6);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bf-color-bg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--bf-color-text);
  line-height: 1.55;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
}

.skip-link:focus {
  left: 0;
  background: var(--bf-color-surface);
  color: var(--bf-color-text);
  padding: 0.5rem 1rem;
  z-index: 100;
}

.wrap {
  max-width: var(--bf-max-width);
  margin: 0 auto;
  padding: 0 var(--bf-space);
}

.site-header {
  border-bottom: 1px solid var(--bf-color-border);
}

.site-header-inner {
  padding: var(--bf-space) 0;
}

main:not(:has(.hero)) {
  display: block;
  max-width: var(--bf-max-width);
  margin: 0 auto;
  padding: calc(var(--bf-space) * 2) var(--bf-space);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.5rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--bf-color-text);
}

.site-brand-mark {
  display: block;
}

/* Hero */

.hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--bf-space) * 5) 0 calc(var(--bf-space) * 4);
  text-align: center;
}

.hero-glow {
  position: absolute;
  inset: -20% -10% auto -10%;
  height: 34rem;
  background: radial-gradient(45rem 22rem at 50% 0%, color-mix(in srgb, var(--bf-color-accent) 22%, transparent), transparent 70%),
    radial-gradient(30rem 18rem at 85% 10%, color-mix(in srgb, var(--bf-color-accent-2) 18%, transparent), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.hero-inner {
  position: relative;
  z-index: 1;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 var(--bf-space);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--bf-color-accent) 12%, transparent);
  color: var(--bf-color-accent-dark);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: 3rem;
  line-height: 1.1;
  margin: 0 0 var(--bf-space);
  letter-spacing: -0.02em;
}

.hero-sub {
  max-width: 40rem;
  margin: 0 auto;
  color: var(--bf-color-muted);
  font-size: 1.15rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
  margin-top: calc(var(--bf-space) * 1.5);
}

/* Buttons */

.btn {
  display: inline-block;
  padding: 0.65rem 1.3rem;
  border-radius: 0.5rem;
  text-decoration: none;
  font-weight: 600;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn-primary {
  background: linear-gradient(135deg, var(--bf-color-accent), var(--bf-color-accent-dark));
  color: var(--bf-color-on-accent);
  box-shadow: 0 6px 16px -6px color-mix(in srgb, var(--bf-color-accent) 60%, transparent);
}

.btn-ghost {
  background: transparent;
  color: var(--bf-color-text);
  border: 1px solid var(--bf-color-border);
}

.btn-lg {
  padding: 0.85rem 1.6rem;
  font-size: 1.05rem;
}

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

.btn-primary:hover {
  box-shadow: 0 10px 20px -6px color-mix(in srgb, var(--bf-color-accent) 65%, transparent);
}

.btn-ghost:hover {
  background: var(--bf-color-bg-alt);
}

@media (prefers-reduced-motion: reduce) {
  .btn {
    transition: none;
  }
  .btn:hover {
    transform: none;
  }
}

/* Section headings */

.section-title {
  text-align: center;
  font-size: 1.9rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.01em;
}

.section-sub {
  text-align: center;
  color: var(--bf-color-muted);
  max-width: 34rem;
  margin: 0 auto calc(var(--bf-space) * 2);
}

/* How it works */

.how-it-works {
  padding: calc(var(--bf-space) * 3) 0;
}

.steps {
  list-style: none;
  margin: calc(var(--bf-space) * 2) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: calc(var(--bf-space) * 1.5);
}

.step-card {
  background: var(--bf-color-surface);
  border: 1px solid var(--bf-color-border);
  border-radius: var(--bf-radius);
  padding: calc(var(--bf-space) * 1.5);
  box-shadow: var(--bf-shadow);
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--bf-color-accent), var(--bf-color-accent-2));
  color: var(--bf-color-on-accent);
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.step-card h3 {
  margin: 0 0 0.4rem;
}

.step-card p {
  margin: 0;
  color: var(--bf-color-muted);
}

/* Tracks */

.tracks {
  padding: calc(var(--bf-space) * 3) 0;
  background: var(--bf-color-bg-alt);
}

.tracks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  gap: calc(var(--bf-space) * 1.5);
  margin-top: calc(var(--bf-space) * 2);
}

.track-card {
  background: var(--bf-color-surface);
  border: 1px solid var(--bf-color-border);
  border-radius: var(--bf-radius);
  padding: calc(var(--bf-space) * 1.75);
  box-shadow: var(--bf-shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.track-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 8px -2px rgba(26, 26, 46, 0.1), 0 16px 32px -12px rgba(26, 26, 46, 0.24);
}

@media (prefers-reduced-motion: reduce) {
  .track-card {
    transition: none;
  }
  .track-card:hover {
    transform: none;
  }
}

.track-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.6rem;
  margin-bottom: 0.75rem;
  background: color-mix(in srgb, var(--bf-color-accent) 12%, transparent);
  color: var(--bf-color-accent-dark);
}

.track-icon svg {
  width: 1.5rem;
  height: 1.5rem;
}

.track-card h2 {
  margin-top: 0;
}

/* Feature grid */

.about {
  padding: calc(var(--bf-space) * 3) 0 calc(var(--bf-space) * 4);
}

.feature-grid {
  list-style: none;
  margin: calc(var(--bf-space) * 2) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: calc(var(--bf-space) * 1.25);
}

.feature-card {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background: var(--bf-color-surface);
  border: 1px solid var(--bf-color-border);
  border-radius: var(--bf-radius);
  padding: calc(var(--bf-space) * 1.1);
}

.feature-icon {
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.5rem;
  background: color-mix(in srgb, var(--bf-color-accent-2) 16%, transparent);
  color: var(--bf-color-accent-2);
}

.feature-icon svg {
  width: 1.25rem;
  height: 1.25rem;
}

.feature-card p {
  margin: 0;
  color: var(--bf-color-muted);
}

.site-footer {
  border-top: 1px solid var(--bf-color-border);
  margin-top: calc(var(--bf-space) * 2);
  padding: var(--bf-space) 0;
  color: var(--bf-color-muted);
  text-align: center;
}

.text-danger {
  color: #e5484d;
}

@media (max-width: 40rem) {
  .hero h1 {
    font-size: 2.1rem;
  }

  .hero-glow {
    height: 24rem;
  }
}