* {
  box-sizing: border-box;
}

:root {
  --font-heading: 'Unbounded', sans-serif;
  --font-body: 'Helvetica Neue', Arial, sans-serif;
  --red: #FF3535;
  --red-soft: rgba(255, 53, 53, 0.24);
  --dark: #18191A;
  --gray-text: #51555B;
  --gray-muted: #979BA0;
  --gray-line: #DEE2E5;
  --gray-track: #E7EAED;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: #f0f0f2;
  color: var(--dark);
}

.page {
  max-width: 640px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

.shell {
  border-radius: 1.25rem;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
}

.panel-dark {
  position: relative;
  background: var(--dark);
  color: #fff;
  padding: 40px 32px;
  overflow: hidden;
}

.panel-dark::after {
  content: '';
  position: absolute;
  right: -40%;
  bottom: -30%;
  width: 90%;
  height: 90%;
  background: radial-gradient(circle, var(--red) 0%, rgba(255, 53, 53, 0) 70%);
  opacity: 0.35;
  pointer-events: none;
}

.eyebrow {
  position: relative;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  margin: 0 0 12px;
}

.title {
  position: relative;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: clamp(28px, 4vw, 36px);
  letter-spacing: -1px;
  margin: 0 0 20px;
}

.note {
  position: relative;
  font-size: 14px;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.75);
  margin: 0 0 14px;
}

.panel-card {
  background: #fff;
  padding: 40px 36px;
}

.panel-card--standalone {
  max-width: 600px;
  margin: 0 auto;
  border-radius: 1.25rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
  text-align: center;
}

.panel-card--standalone p {
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-text);
  margin: 0 0 12px;
}

.panel-card--standalone p:first-child {
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 22px;
  color: var(--dark);
}

.progress {
  margin-bottom: 28px;
}

.progress__bar {
  height: 4px;
  background: var(--gray-track);
  border-radius: 30px;
  overflow: hidden;
}

.progress__fill {
  height: 100%;
  width: 16.666%;
  background: var(--red);
  border-radius: 1rem;
  transition: width 0.3s ease-in-out;
}

.step {
  display: none;
}

.step.active {
  display: block;
}

.field {
  margin-bottom: 20px;
}

.field > label,
.field > legend {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--dark);
}

.field__hint {
  font-weight: 400;
  color: var(--gray-muted);
  font-size: 13px;
}

.field input[type="email"],
.field input[type="tel"],
.field input[type="text"],
.field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--gray-line);
  border-radius: 0.75rem;
  font-size: 15px;
  font-family: inherit;
  color: var(--dark);
}

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--red);
}

.field__other {
  margin-top: 8px;
}

.field__error {
  display: block;
  color: var(--red);
  font-size: 13px;
  margin-top: 4px;
  min-height: 16px;
}

.field--checkbox-group {
  border: none;
  padding: 0;
}

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

.options li:not(:last-child) {
  margin-bottom: 0.75rem;
}

.option {
  display: flex;
  align-items: center;
  cursor: pointer;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.2;
  color: var(--gray-text);
}

.option__input {
  flex-shrink: 0;
  display: grid;
  place-content: center;
  appearance: none;
  background-color: var(--gray-line);
  padding: 0.25rem;
  margin: 0 0.9375rem 0 0;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  transition: 120ms background-color ease-in-out;
  position: relative;
  transform: translateY(1px);
  cursor: pointer;
}

.option__input--checkbox {
  border-radius: 0.25rem;
}

.option__input:checked {
  background-color: var(--red-soft);
}

.option__input::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  transform: scale(0);
  translate: -50% -50%;
  transition: 120ms transform ease-in-out;
  box-shadow: inset 1rem 1rem var(--red);
}

.option__input--checkbox::before {
  border-radius: 0.125rem;
}

.option__input:checked::before {
  transform: scale(1);
}

.consent {
  display: flex;
  align-items: flex-start;
  gap: 0;
  cursor: pointer;
  font-size: 14px;
  color: var(--gray-text);
}

.consent .option__input {
  margin-top: 2px;
}

.nav-buttons {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 8px;
}

.nav-buttons__counter {
  color: var(--gray-muted);
  font-size: 14px;
  white-space: nowrap;
}

.nav-button {
  padding: 15px;
  border: none;
  border-radius: 0.75rem;
  font-size: 14px;
  font-family: var(--font-body);
  font-weight: 600;
  cursor: pointer;
}

.nav-button--back {
  background: var(--gray-track);
  color: var(--gray-text);
}

.nav-button--next {
  flex: 1;
  background: var(--red);
  color: #fff;
}

.nav-button--next:disabled {
  background: var(--gray-track);
  color: var(--gray-text);
  cursor: not-allowed;
}

@media (max-width: 480px) {
  .panel-card {
    padding: 28px 20px;
  }

  .panel-dark {
    padding: 28px 20px;
  }
}