:root {
  --bg: #f7fafc;
  --surface: #ffffff;
  --ink: #0f172a;
  --muted: #334155;
  --accent: #0891b2;
  --accent-2: #f59e0b;
  --border: #cbd5e1;
  --shadow: 0 20px 40px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Sora", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 10%, #cffafe 0%, transparent 38%),
    radial-gradient(circle at 85% 0%, #fef3c7 0%, transparent 34%),
    var(--bg);
  min-height: 100vh;
}

.atmosphere {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(
      to right,
      rgba(100, 116, 139, 0.09) 1px,
      transparent 1px
    ),
    linear-gradient(to bottom, rgba(100, 116, 139, 0.09) 1px, transparent 1px);
  background-size: 42px 42px;
  opacity: 0.35;
}

.site-header,
main {
  width: min(1080px, calc(100% - 2rem));
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.site-header {
  padding: 1.8rem 0 1.2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.kicker {
  margin: 0;
  font-family: "IBM Plex Mono", monospace;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.repo-link {
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.4rem 0.95rem;
  font-size: 0.9rem;
  background: rgba(255, 255, 255, 0.75);
}

.hero {
  padding: 2rem 0 1rem;
}

.badge {
  margin: 0 0 1rem;
  font-family: "IBM Plex Mono", monospace;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.05;
  max-width: 15ch;
}

.subtitle {
  max-width: 65ch;
  color: var(--muted);
  line-height: 1.65;
  margin: 1rem 0 1.6rem;
}

.hero-actions {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
}

.btn {
  text-decoration: none;
  border-radius: 10px;
  padding: 0.7rem 1rem;
  border: 1px solid transparent;
  font-weight: 600;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), #06b6d4);
  color: #ffffff;
}

.btn.ghost {
  border-color: var(--border);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.65);
}

.panel {
  margin: 1.5rem 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 1.25rem;
}

.panel h2 {
  margin: 0 0 0.5rem;
}

.panel p {
  color: var(--muted);
}

.diagram {
  width: 100%;
  margin-top: 0.8rem;
  border-radius: 14px;
  border: 1px solid #e2e8f0;
  background: linear-gradient(180deg, #f8fafc, #ecfeff);
}

.diagram text {
  fill: #0f172a;
  font-size: 18px;
  font-family: "IBM Plex Mono", monospace;
}

.diagram text.title {
  font-weight: 500;
  fill: #1e293b;
}

.node {
  stroke: #0f172a;
  stroke-width: 1.4;
}

.node-a {
  fill: url(#nodeGradA);
}

.node-b {
  fill: url(#nodeGradB);
}

.links line {
  stroke: #1f2937;
  stroke-width: 2;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.feature-grid article {
  border: 1px solid #e2e8f0;
  border-radius: 14px;
  padding: 1rem;
  background: #f8fafc;
}

.feature-grid h3 {
  margin: 0 0 0.45rem;
}

ol {
  margin: 0.5rem 0 1rem;
  padding-left: 1.2rem;
}

ol li {
  margin-bottom: 0.45rem;
}

pre {
  margin: 0;
  border: 1px solid #1e293b;
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 12px;
  padding: 1rem;
  overflow-x: auto;
}

code {
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.88rem;
}

.reveal {
  opacity: 0;
  animation: rise 580ms ease forwards;
}

.delay-1 {
  animation-delay: 80ms;
}

.delay-2 {
  animation-delay: 140ms;
}

.delay-3 {
  animation-delay: 190ms;
}

.delay-4 {
  animation-delay: 240ms;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 860px) {
  .feature-grid {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 1rem;
  }
}