*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --text-primary: #0a0a0a;
  --text-body: #4a4a4a;
  --text-muted: #9a9a9a;
  --border: #e5e5e5;
  --border-active: #0a0a0a;
  --bg: #ffffff;
  --radius: 10px;
  --transition: 200ms ease;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Main ── */

.main {
  flex: 1;
  padding: 40px 20px 60px;
  max-width: 640px;
  margin: 0 auto;
  width: 100%;
}

/* ── Steps ── */

.step {
  display: none;
  transition: opacity 200ms ease, transform 200ms ease;
}

/* ── Step header ── */

.step-header {
  position: relative;
  display: flex;
  align-items: flex-start;
  margin-bottom: 40px;
  min-height: 44px;
}

.step-header:has(.back-btn) .step-title {
  padding-left: 44px;
  padding-right: 44px;
}

.step-title {
  font-size: 28px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.2;
  flex: 1;
  padding-top: 4px;
  text-align: center;
}

/* ── Back button ── */

.back-btn {
  position: absolute;
  left: 0;
  top: 0;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: -8px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
  min-width: 44px;
  min-height: 44px;
}

.back-btn:hover {
  background: #f5f5f5;
}

.back-btn:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

/* ── Cards grid ── */

.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

/* ── Card ── */

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  text-align: center;
  overflow: hidden;
  width: 100%;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  border-color: var(--border-active);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

.card:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 2px;
}

/* Card with photo */

.card-img-wrap {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius) var(--radius) 0 0;
}

.card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 300ms ease;
}

.card:hover .card-img {
  transform: scale(1.02);
}

/* Card body */

.card-body {
  padding: 16px 24px 24px;
}

.card-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.card-sub {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ── Form ── */

.form-intro {
  font-size: 16px;
  color: var(--text-body);
  margin-bottom: 32px;
  line-height: 1.5;
  text-align: center;
}

.form-wrap {
  max-width: 480px;
  margin: 0 auto;
}

.field {
  margin-bottom: 20px;
}

.label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.input {
  width: 100%;
  font-size: 16px;
  font-family: inherit;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  background: var(--bg);
  outline: none;
  appearance: none;
  transition: border-color var(--transition);
}

.input::placeholder {
  color: var(--text-muted);
}

.input:focus {
  border-color: var(--text-primary);
}

.input.invalid {
  border-color: #c0392b;
}

.field-error {
  display: none;
  font-size: 13px;
  color: #c0392b;
  margin-top: 6px;
}

.field-error.visible {
  display: block;
}

/* ── Submit button ── */

.submit-btn {
  width: 100%;
  padding: 14px 24px;
  background: var(--text-primary);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  margin-top: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  transition: background var(--transition), opacity var(--transition);
}

.submit-btn:hover {
  background: #1a1a1a;
}

.submit-btn:focus-visible {
  outline: 2px solid var(--text-primary);
  outline-offset: 3px;
}

.submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-loader {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 600ms linear infinite;
  flex-shrink: 0;
}

.submit-btn.loading .btn-text {
  opacity: 0.7;
}

.submit-btn.loading .btn-loader {
  display: block;
}

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

/* ── Footer ── */

.footer {
  border-top: 1px solid var(--border);
  padding: 20px;
  text-align: center;
}

.footer-text {
  font-size: 14px;
  color: var(--text-muted);
}

/* ── Desktop ── */

@media (min-width: 768px) {
  .main {
    padding: 56px 40px 80px;
    max-width: 900px;
  }

  .step-title {
    font-size: 40px;
  }

  .cards {
    grid-template-columns: 1fr 1fr;
  }

  .form-wrap {
    max-width: 480px;
  }
}