:root {
  --green: #0c3b2e;
  --green-2: #11533f;
  --paper: #f4f2ec;
  --ink: #17201c;
  --muted: #56615b;
  --rule: #d8d6cc;
  --accent: #2d7a5f;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.55 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

a {
  color: var(--accent);
  text-underline-offset: 0.15em;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding: 1rem clamp(1rem, 4vw, 3rem);
  background: var(--green);
  color: #eef5f1;
}

.top h1 {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.top h1 span {
  font-weight: 400;
  opacity: 0.75;
}

.tag {
  margin: 0.1rem 0 0;
  font-size: 0.85rem;
  opacity: 0.8;
}

.top nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1rem;
}

.top nav a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: #eef5f1;
  font-size: 0.9rem;
}

main {
  width: min(1100px, 100%);
  margin: 0 auto;
  padding: clamp(1rem, 3vw, 2.5rem) clamp(1rem, 4vw, 3rem) 3rem;
}

.explain h2 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
}

.explain p {
  max-width: 70ch;
  margin: 0 0 0.6rem;
}

.small {
  font-size: 0.85rem;
  color: var(--muted);
}

.window {
  margin-top: 1.25rem;
  overflow: hidden;
  border: 1px solid var(--rule);
  border-radius: 14px;
  background: #fff;
  box-shadow: 0 18px 40px -24px #0c3b2e66;
}

.chrome {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem;
  border-bottom: 1px solid var(--rule);
  background: #ecebe4;
}

.nav,
.reset,
#retry {
  min-width: 44px;
  min-height: 44px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}

.nav:hover:not(:disabled),
.reset:hover:not(:disabled) {
  background: #dddbd2;
}

.nav:disabled,
.reset:disabled {
  opacity: 0.4;
  cursor: default;
}

.nav svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.address {
  flex: 1;
  min-width: 0;
  margin: 0;
  padding: 0.55rem 0.8rem;
  overflow: hidden;
  border-radius: 999px;
  background: #fff;
  font: 0.9rem/1.2 ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.reset {
  padding: 0 0.8rem;
  font: inherit;
  font-size: 0.85rem;
}

.stage {
  position: relative;
  height: min(70vh, 640px);
  min-height: 420px;
}

iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
  background: #f0f2f5;
}

.boot,
.error {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  padding: 1.5rem;
  background: #fbfaf7;
}

.steps {
  display: grid;
  gap: 0.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  display: flex;
  gap: 0.6rem;
  align-items: center;
  color: var(--muted);
}

.steps li::before {
  content: '';
  width: 0.9rem;
  height: 0.9rem;
  flex: none;
  border: 2px solid var(--rule);
  border-radius: 50%;
}

.steps li[data-state='active'] {
  color: var(--ink);
  font-weight: 600;
}

.steps li[data-state='active']::before {
  border-color: var(--accent);
  border-right-color: transparent;
  animation: spin 0.9s linear infinite;
}

.steps li[data-state='done']::before {
  border-color: var(--accent);
  background: var(--accent);
}

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

.error p {
  max-width: 52ch;
  margin: 0 0 0.75rem;
}

#retry {
  justify-self: start;
  padding: 0 1rem;
  border-color: var(--accent);
  color: var(--accent);
  font: inherit;
}

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

@media (prefers-reduced-motion: reduce) {
  .steps li[data-state='active']::before {
    animation: none;
  }
}

@media (max-width: 560px) {
  .reset {
    padding: 0 0.5rem;
  }
  .stage {
    height: 75vh;
  }
}