:root {
  --bg: #eef1f8;
  --surface: #ffffff;
  --surface-muted: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #6366f1;
  --accent-soft: #eef2ff;
  --fragile: #dc2626;
  --fragile-soft: #fef2f2;
  --resilient: #059669;
  --resilient-soft: #ecfdf5;
  --warn: #b45309;
  --warn-soft: #fef3c7;
  --shadow-md: 0 8px 30px rgb(15 23 42 / 0.07);
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --font-sans:
    "Inter", ui-sans-serif, system-ui, -apple-system, blinkmacsystemfont, "Segoe UI", sans-serif;
  --font-mono:
    "JetBrains Mono", ui-monospace, "Cascadia Code", "Segoe UI Mono", monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  background: var(--bg);
  background-image:
    radial-gradient(circle at 0% 0%, rgb(99 102 241 / 0.08), transparent 42%),
    radial-gradient(circle at 100% 0%, rgb(220 38 38 / 0.05), transparent 38%),
    radial-gradient(circle at 50% 100%, rgb(5 150 105 / 0.06), transparent 40%);
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.5;
  margin: 0;
  min-height: 100vh;
}

button {
  font: inherit;
}

code {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.875em;
  padding: 0.1rem 0.35rem;
}

a {
  color: var(--accent);
}

.demo {
  display: grid;
  gap: 1.25rem;
  margin: 0 auto;
  max-width: 980px;
  padding: 2.5rem 1.25rem 3.5rem;
}

.hero {
  display: grid;
  gap: 0.75rem;
}

.hero h1,
.hero p {
  margin: 0;
}

.hero h1 {
  font-size: clamp(1.875rem, 4vw, 2.35rem);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.eyebrow {
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  margin: 0;
  text-transform: uppercase;
}

.eyebrow--chaos {
  color: #7c3aed;
}

.eyebrow--fragile {
  color: var(--fragile);
}

.eyebrow--resilient {
  color: var(--resilient);
}

.lede {
  color: var(--text-muted);
  max-width: 62ch;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: grid;
  gap: 1rem;
  padding: 1.25rem;
}

.panel-heading {
  align-items: start;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  justify-content: space-between;
}

.panel-heading h2 {
  font-size: 1.125rem;
  margin: 0.25rem 0 0;
}

.inject-label {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  margin: 0;
  max-width: 28ch;
  padding: 0.45rem 0.65rem;
}

.fault-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.fault-btn {
  align-items: center;
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  cursor: pointer;
  display: inline-flex;
  font-size: 0.8125rem;
  font-weight: 600;
  gap: 0.35rem;
  padding: 0.45rem 0.85rem;
  transition:
    background 0.15s,
    border-color 0.15s,
    transform 0.1s;
}

.fault-btn:hover {
  background: var(--accent-soft);
  border-color: rgb(99 102 241 / 0.35);
}

.fault-btn--active {
  background: var(--accent-soft);
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgb(99 102 241 / 0.15);
}

.fault-btn__icon {
  font-size: 0.95rem;
}

.hint,
.note {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin: 0;
}

.pipeline {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  justify-content: center;
}

.pipeline__node {
  background: var(--surface);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  min-width: 9rem;
  padding: 0.65rem 1rem;
  text-align: center;
  transition:
    border-color 0.2s,
    box-shadow 0.2s,
    transform 0.2s;
}

.pipeline__node--hot[data-state='warn'] {
  animation: pulse-warn 1.2s ease-in-out infinite;
  border-color: var(--warn);
  box-shadow: 0 0 0 4px rgb(180 83 9 / 0.12);
}

.pipeline__node--hot[data-state='fail'] {
  animation: pulse-fail 1.2s ease-in-out infinite;
  border-color: var(--fragile);
  box-shadow: 0 0 0 4px rgb(220 38 38 / 0.12);
}

.pipeline__label {
  font-size: 0.8125rem;
  font-weight: 700;
}

.pipeline__arrow {
  color: var(--text-muted);
  font-size: 1.25rem;
  font-weight: 700;
}

@keyframes pulse-warn {
  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.03);
  }
}

@keyframes pulse-fail {
  0%,
  100% {
    transform: scale(1);
  }

  50% {
    transform: scale(1.04);
  }
}

.verdict {
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-left-width: 4px;
  border-radius: var(--radius-md);
  display: grid;
  gap: 0.35rem;
  padding: 0.85rem 1rem;
}

.verdict[data-kind='idle'] {
  border-left-color: var(--accent);
}

.verdict[data-kind='warn'] {
  background: var(--warn-soft);
  border-left-color: var(--warn);
}

.verdict[data-kind='pass'] {
  background: var(--resilient-soft);
  border-left-color: var(--resilient);
}

.verdict[data-kind='fail'] {
  background: var(--fragile-soft);
  border-left-color: var(--fragile);
}

.verdict__tag {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.verdict__detail {
  margin: 0;
  font-size: 0.9rem;
}

.compare-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.checkout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: grid;
  gap: 0.85rem;
  padding: 1.15rem;
}

.checkout--fragile {
  border-top: 3px solid var(--fragile);
}

.checkout--resilient {
  border-top: 3px solid var(--resilient);
}

.checkout--crash {
  opacity: 0.92;
  outline: 2px dashed var(--fragile);
}

.checkout__header {
  align-items: start;
  display: flex;
  gap: 0.75rem;
  justify-content: space-between;
}

.checkout__header h2 {
  font-size: 1rem;
  margin: 0.25rem 0 0;
}

.mode-badge {
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 0.25rem 0.55rem;
  text-transform: uppercase;
  white-space: nowrap;
}

.mode-badge--fragile {
  background: var(--fragile-soft);
  color: var(--fragile);
}

.mode-badge--resilient {
  background: var(--resilient-soft);
  color: var(--resilient);
}

.checkout-items {
  list-style: none;
  margin: 0;
  padding: 0;
}

.checkout-item {
  align-items: center;
  border-bottom: 1px solid var(--border);
  display: flex;
  font-size: 0.875rem;
  justify-content: space-between;
  padding: 0.5rem 0;
}

.checkout-item--broken {
  color: var(--fragile);
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  word-break: break-all;
}

.checkout-total-row {
  align-items: baseline;
  display: flex;
  font-size: 0.9375rem;
  justify-content: space-between;
}

.checkout-total-row strong {
  font-size: 1.25rem;
}

.btn {
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 700;
  padding: 0.65rem 1rem;
  transition: opacity 0.15s;
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.72;
}

.btn--fragile {
  background: var(--fragile);
  color: #fff;
}

.btn--resilient {
  background: var(--resilient);
  color: #fff;
}

.checkout-status {
  font-size: 0.8125rem;
  min-height: 1.25rem;
}

.checkout-status--loading {
  align-items: center;
  color: var(--text-muted);
  display: flex;
  gap: 0.5rem;
}

.checkout-status--ok {
  color: var(--resilient);
}

.checkout-status--warn {
  color: var(--warn);
}

.checkout-status--fail {
  color: var(--fragile);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.spinner {
  animation: spin 0.8s linear infinite;
  border: 2px solid var(--border);
  border-radius: 50%;
  border-top-color: var(--resilient);
  height: 1rem;
  width: 1rem;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 640px) {
  .panel-heading {
    flex-direction: column;
  }

  .inject-label {
    max-width: none;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1120;
    --surface: #111827;
    --surface-muted: #1e293b;
    --border: #334155;
    --text: #f1f5f9;
    --text-muted: #94a3b8;
    --accent-soft: rgb(99 102 241 / 0.15);
    --fragile-soft: rgb(220 38 38 / 0.12);
    --resilient-soft: rgb(5 150 105 / 0.12);
    --warn-soft: rgb(180 83 9 / 0.15);
  }
}