body {
  min-width: 320px;
  overflow-x: hidden;
  background: #2f302d;
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

body::selection {
  background: var(--color-soft);
}

.progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
  width: 100%;
  height: 4px;
  background: rgba(31, 36, 32, 0.12);
}

.progress__bar {
  width: 0;
  height: 100%;
  background: var(--color-accent);
  transition: width 160ms ease;
}

/* На смартфонах прогресс-бар может давать визуальный артефакт у нижней панели браузера. */
@media (max-width: 767px) {
  .progress {
    display: none;
  }
}

main {
  width: 100%;
}

.screen {
  min-height: 100svh;
  padding: calc(var(--space-md) + 4px) var(--space-md) var(--space-md);
  border-bottom: 0;
  scroll-behavior: smooth;
}

.screen:focus,
.screen:focus-visible {
  outline: 0;
}

.js-enabled body {
  overflow: hidden;
}

.js-enabled main {
  height: 100svh;
}

.js-enabled .screen {
  display: none;
  height: 100svh;
  min-height: auto;
  overflow-y: auto;
  opacity: 0;
  transform: translateY(10px);
}

.js-enabled .screen.is-active {
  display: block;
  animation: screenReveal 220ms ease-out forwards;
}

.screen:nth-child(even) {
  background: transparent;
}

.screen__inner {
  width: min(100%, var(--content-width));
  margin: 0 auto;
  min-height: calc(100svh - var(--space-md) * 2 - 4px);
  padding: var(--space-md) var(--space-md) var(--space-xl);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
}

.screen__photo {
  width: 100%;
  aspect-ratio: 3 / 2;
  max-height: 24rem;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-soft);
}

.screen__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

h1,
h2 {
  max-width: 34rem;
  margin-top: var(--space-xl);
  font-size: 1.55rem;
  line-height: 1.22;
  letter-spacing: 0;
}

h3 {
  margin-top: var(--space-xl);
  font-size: 1.25rem;
  line-height: 1.25;
  letter-spacing: 0;
}

p {
  margin-top: var(--space-md);
}

.screen__text {
  max-width: 39rem;
  margin-top: var(--space-lg);
}

.screen__text > * + * {
  margin-top: var(--space-md);
}

ul,
ol {
  margin-top: var(--space-md);
  padding: var(--space-md) var(--space-md) var(--space-md) 1.65rem;
  border-left: 3px solid var(--color-accent);
  background: rgba(255, 253, 248, 0.58);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

li + li {
  margin-top: var(--space-xs);
}

.case {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: var(--space-md);
  max-width: 37rem;
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-line);
  align-items: start;
}

.case__photo {
  width: 6rem;
  height: 6rem;
  border-radius: var(--radius-md);
  object-fit: cover;
  object-position: center;
}

.case__body h3 {
  margin-top: 0;
}

.button,
button[type="submit"] {
  display: flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 3.25rem;
  margin-top: var(--space-2xl);
  margin-right: auto;
  margin-left: auto;
  max-width: 100%;
  padding: 0.9rem 1.2rem;
  border: 0;
  border-radius: var(--radius-md);
  background: var(--color-accent);
  color: var(--color-accent-text);
  font-weight: 700;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition:
    background 160ms ease,
    transform 160ms ease;
}

.button:hover,
button[type="submit"]:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

.button:disabled,
button[type="submit"]:disabled {
  cursor: wait;
  opacity: 0.72;
  transform: none;
}

.button-note {
  max-width: 30rem;
  margin-right: auto;
  margin-top: var(--space-sm);
  margin-left: auto;
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.5;
  text-align: center;
}

form {
  width: min(100%, var(--form-width));
  margin-right: auto;
  margin-top: var(--space-2xl);
  margin-left: auto;
}

.form-field {
  display: grid;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}

.form-field--hidden {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

label {
  color: var(--color-text);
  font-weight: 700;
}

.field-hint {
  color: var(--color-muted);
  font-size: 0.875rem;
  line-height: 1.45;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 0.9rem 1rem;
}

textarea {
  min-height: 8rem;
  resize: vertical;
}

.form-error {
  margin-top: var(--space-xs);
  color: var(--color-danger);
  font-size: 0.9375rem;
}

.form-message {
  display: none;
  margin-top: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  font-weight: 700;
  line-height: 1.45;
}

.form-message.is-visible {
  display: block;
}

.form-message.is-muted {
  background: var(--color-soft);
  color: var(--color-muted);
}

.form-message.is-error {
  background: #f7ddd8;
  color: var(--color-danger);
}

.form-message.is-success {
  background: #dfeadf;
  color: var(--color-accent-hover);
}

.form-note {
  max-width: var(--form-width);
  margin-right: auto;
  margin-top: var(--space-md);
  margin-left: auto;
  color: var(--color-muted);
  font-size: 0.9375rem;
  line-height: 1.5;
  text-align: center;
}

.form-note--privacy {
  font-size: 0.8125rem;
}

.thanks {
  max-width: var(--form-width);
  margin-right: auto;
  margin-top: var(--space-2xl);
  margin-left: auto;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-line);
  text-align: center;
}

.thanks[hidden] {
  display: none;
}

@media (min-width: 768px) {
  body {
    font-size: 1.0625rem;
  }

  .screen {
    padding: calc(var(--space-xl) + 4px) var(--space-xl) var(--space-xl);
  }

  .screen__inner {
    min-height: calc(100svh - var(--space-xl) * 2 - 4px);
    padding: var(--space-lg) var(--space-xl) var(--space-2xl);
  }

  .screen__photo {
    max-height: 28rem;
  }

  h1,
  h2 {
    font-size: 1.85rem;
  }

  .button,
  button[type="submit"] {
    min-height: 3.5rem;
    padding-right: 1.5rem;
    padding-left: 1.5rem;
  }

  .case {
    grid-template-columns: 6rem 1fr;
  }
}

@media (min-width: 1024px) {
  .screen {
    padding-top: calc(var(--space-xl) + 4px);
    padding-bottom: var(--space-xl);
  }

  .screen__inner {
    width: min(100%, 44rem);
    min-height: calc(100svh - var(--space-xl) * 2 - 4px);
  }

  .screen__photo {
    max-height: 30rem;
  }

  h1,
  h2 {
    font-size: 1.95rem;
  }
}

@keyframes screenReveal {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .progress__bar,
  .button,
  button[type="submit"] {
    transition: none;
  }

  .js-enabled .screen.is-active {
    animation: none;
    opacity: 1;
    transform: none;
  }
}