:root {
  --bg: #f3f5f8;
  --surface: #ffffff;
  --ink: #18202c;
  --muted: #5d6878;
  --line: #d9dee6;
  --accent: #0f766e;
  --accent-ink: #ffffff;
  --accent-soft: #e2f4f1;
  --error: #b42318;
  --focus: #0f766e;
  --radius: 12px;
  --dot: 2rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

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

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}

.wrap {
  max-inline-size: 620px;
  margin-inline: auto;
  padding: 3rem 1.25rem;
}

h1 {
  margin-block: 0 1.5rem;
  font-size: clamp(1.5rem, 4vw, 2rem);
}

.visually-hidden {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.step[hidden] {
  display: none;
}

.step {
  animation: step-in 240ms ease-out;
}

.progress {
  display: flex;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
}

.progress-step {
  position: relative;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.875rem;
  text-align: center;
}

.progress-step:not(:first-child)::before {
  content: "";
  position: absolute;
  inset-block-start: calc(var(--dot) / 2 - 1px);
  inset-inline-end: calc(50% + var(--dot) / 2 + 4px);
  inline-size: calc(100% - var(--dot) - 8px);
  block-size: 2px;
  background: var(--line);
}

.progress-dot {
  transition: background-color 200ms, border-color 200ms, color 200ms;
  display: grid;
  place-items: center;
  inline-size: var(--dot);
  block-size: var(--dot);
  border: 2px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  font-weight: 600;
}

.progress-step[aria-current="step"] {
  color: var(--ink);
  font-weight: 600;
}

.progress-step[aria-current="step"] .progress-dot {
  border-color: var(--accent);
  color: var(--accent);
}

.progress-step.is-done .progress-dot {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
}

.progress-step.is-done + .progress-step::before {
  background: var(--accent);
}

.stepper {
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.step-title {
  margin-block: 0 1.25rem;
  font-size: 1.25rem;
}

.step-title:focus {
  outline: none;
}

.field {
  margin-block-end: 1.1rem;
}

.field > label,
.group legend {
  display: block;
  margin-block-end: 0.35rem;
  font-weight: 600;
}

.optional {
  color: var(--muted);
  font-weight: 400;
}

input[type="text"],
input[type="email"],
input[type="password"],
select {
  inline-size: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
}

input:focus-visible,
select:focus-visible {
  outline-offset: 0;
  border-color: var(--accent);
}

[aria-invalid="true"] {
  border-color: var(--error);
}

.group {
  margin-inline: 0;
  padding: 0;
  border: 0;
}

.choice {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding-block: 0.35rem;
  cursor: pointer;
}

.choice input {
  inline-size: 1.1rem;
  block-size: 1.1rem;
  margin: 0;
  accent-color: var(--accent);
}

.field-hint {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.field-error {
  margin: 0.3rem 0 0;
  color: var(--error);
  font-size: 0.875rem;
}

.field-error:empty {
  display: none;
}

.summary-block {
  padding-block: 0.9rem;
  border-block-start: 1px solid var(--line);
}

.summary-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-block-end: 0.5rem;
}

.summary-head h3 {
  margin: 0;
  font-size: 1rem;
}

.summary dl {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.35rem 1.25rem;
  margin: 0;
}

.summary dt {
  color: var(--muted);
}

.summary dd {
  margin: 0;
  overflow-wrap: anywhere;
}

.link-btn {
  padding: 0.25rem 0.5rem;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--accent);
  font: inherit;
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
}

.done {
  padding: 2rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  text-align: center;
}

.done h2 {
  margin-block: 0 0.5rem;
  color: var(--accent);
}

.done h2:focus {
  outline: none;
}

.done-text {
  margin-block: 0 1.25rem;
  color: var(--muted);
}

.step-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-block-start: 1.5rem;
  padding-block-start: 1.25rem;
  border-block-start: 1px solid var(--line);
}

.btn {
  padding: 0.7rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.btn-back {
  margin-inline-end: auto;
}

.btn-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--accent-ink);
}

.btn:hover {
  filter: brightness(0.96);
}

@keyframes step-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
}

@media (max-width: 520px) {
  .wrap {
    padding-block: 2rem;
  }

  .stepper {
    padding: 1.1rem;
  }

  .progress-label {
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .summary dl {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .summary dd {
    margin-block-end: 0.5rem;
  }

  .step-actions .btn {
    flex: 1;
  }

  .btn-back {
    margin-inline-end: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .step {
    animation: none;
  }

  .progress-dot {
    transition: none;
  }
}