:root {
  --bg: #0e1221;
  --bg-light: #161c30;
  --panel: #11172a;
  --accent: #4fc3f7;
  --accent-soft: rgba(79, 195, 247, 0.16);
  --accent-strong: #00b3ff;
  --text: #f2f5ff;
  --muted: #b3c0e0;
  --shadow: rgba(4, 9, 20, 0.4);
  font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: radial-gradient(circle at top, rgba(79, 195, 247, 0.14), transparent 55%),
    radial-gradient(circle at bottom right, rgba(76, 175, 80, 0.12), transparent 55%),
    var(--bg);
  color: var(--text);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 0.75rem 1rem;
  border-radius: 0 0 0.75rem 0.75rem;
  z-index: 10;
  font-weight: 600;
}

.skip-link:focus {
  left: 1rem;
}

.hero {
  padding: 4.5rem 1.5rem 3rem;
  background: linear-gradient(160deg, rgba(24, 32, 54, 0.9), rgba(14, 18, 32, 0.9));
  border-bottom: 1px solid rgba(79, 195, 247, 0.2);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 20% 20%, rgba(79, 195, 247, 0.2), transparent 55%),
    radial-gradient(circle at 80% 80%, rgba(13, 71, 161, 0.25), transparent 60%);
  opacity: 0.8;
  pointer-events: none;
}

.hero__wrap {
  position: relative;
  max-width: 960px;
  margin: 0 auto;
  text-align: center;
}

.hero__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.3em;
  color: var(--accent);
  font-size: 0.85rem;
  margin: 0 0 1rem;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.75rem, 5vw, 3.9rem);
  letter-spacing: 0.04em;
}

.hero__lead {
  margin: 1rem auto 2rem;
  max-width: 640px;
  line-height: 1.7;
  color: var(--muted);
  font-size: 1.1rem;
}

.hero__nav {
  display: inline-flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.hero__nav a {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(79, 195, 247, 0.35);
  color: var(--text);
  text-decoration: none;
  padding: 0.75rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  transition: transform 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.hero__nav a:hover,
.hero__nav a:focus {
  background: rgba(79, 195, 247, 0.16);
  transform: translateY(-3px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.25);
}

main {
  width: min(1100px, 92vw);
  margin: -2.5rem auto 0;
  padding-bottom: 4rem;
  display: grid;
  gap: 2.5rem;
  flex: 1 0 auto;
}

.panel {
  background: linear-gradient(145deg, rgba(16, 23, 43, 0.95), rgba(13, 20, 36, 0.95));
  padding: 2.75rem 2.5rem;
  border-radius: 28px;
  border: 1px solid rgba(79, 195, 247, 0.14);
  box-shadow: 0 24px 45px var(--shadow);
  position: relative;
  overflow: hidden;
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(79, 195, 247, 0.22), transparent 60%);
  opacity: 0.65;
  pointer-events: none;
}

.panel > * {
  position: relative;
}

.panel h2 {
  margin-top: 0;
  font-size: clamp(2rem, 4vw, 2.4rem);
}

.panel__intro {
  color: var(--muted);
  margin-bottom: 2rem;
  line-height: 1.7;
}

.panel__cta {
  display: grid;
  gap: 0.75rem;
  justify-items: center;
  margin: 1.25rem 0 2.25rem;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.75rem;
  border-radius: 999px;
  font-weight: 600;
  letter-spacing: 0.01em;
  background: linear-gradient(135deg, rgba(79, 195, 247, 0.22), rgba(129, 212, 250, 0.16));
  border: 1px solid rgba(79, 195, 247, 0.45);
  color: var(--text);
  text-decoration: none;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.28);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.cta-button:hover,
.cta-button:focus {
  transform: translateY(-2px);
  background: linear-gradient(135deg, rgba(79, 195, 247, 0.32), rgba(129, 212, 250, 0.22));
  box-shadow: 0 18px 32px rgba(0, 0, 0, 0.32);
}

.panel__cta-note {
  margin: 0;
  color: var(--muted);
  text-align: center;
  max-width: 420px;
  line-height: 1.6;
}

.card-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.card {
  background: rgba(11, 18, 33, 0.92);
  border-radius: 20px;
  padding: 1.75rem;
  border: 1px solid rgba(79, 195, 247, 0.2);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 32px rgba(0, 0, 0, 0.35);
}

.card__list {
  margin: 0;
  display: grid;
  gap: 0.8rem;
}

.card__list dt {
  font-weight: 700;
  color: var(--accent);
}

.card__list dd {
  margin: 0.2rem 0 0;
  line-height: 1.6;
}

.stack {
  display: grid;
  gap: 1.75rem;
}

.feature {
  background: rgba(8, 14, 27, 0.88);
  border-radius: 20px;
  padding: 1.75rem 2rem;
  border: 1px solid rgba(79, 195, 247, 0.18);
  display: grid;
  gap: 1rem;
  align-items: start;
}

.feature h3 {
  margin: 0 0 0.35rem;
}

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

.feature ul {
  margin: 0;
  padding-left: 1.1rem;
  line-height: 1.6;
}

.timeline {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-bottom: 2rem;
}

.timeline article {
  background: rgba(9, 16, 30, 0.92);
  border-radius: 18px;
  padding: 1.5rem;
  border: 1px solid rgba(79, 195, 247, 0.16);
}

.timeline h3 {
  margin: 0 0 0.75rem;
}

.timeline ul {
  margin: 0;
  padding-left: 1.1rem;
  line-height: 1.6;
}

.callout {
  background: var(--accent-soft);
  border-left: 4px solid var(--accent-strong);
  padding: 1.5rem 1.75rem;
  border-radius: 16px;
  color: var(--text);
}

.callout h3 {
  margin-top: 0;
}

.panel--accent {
  background: linear-gradient(145deg, rgba(17, 27, 54, 0.95), rgba(13, 28, 44, 0.95));
  border: 1px solid rgba(129, 212, 250, 0.25);
}

.practice-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.practice-grid article {
  background: rgba(8, 16, 30, 0.85);
  border-radius: 18px;
  padding: 1.5rem 1.75rem;
  border: 1px solid rgba(79, 195, 247, 0.18);
  line-height: 1.6;
}

.panel__footer {
  margin-top: 2rem;
  color: var(--muted);
  text-align: center;
}

.footer {
  margin: 3rem auto 2.5rem;
  text-align: center;
  color: var(--muted);
  width: min(900px, 90vw);
  line-height: 1.6;
}

@media (max-width: 720px) {
  .panel {
    padding: 2.25rem 1.75rem;
  }

  .hero {
    padding: 3.5rem 1.25rem 2.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}