* {
  box-sizing: border-box;
}

:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --border: #d9deea;
  --text: #1a2433;
  --muted: #475569;
  --accent: #2d6cdf;
  --accent-soft: #eaf1ff;
  --shadow: rgba(15, 23, 42, 0.08);
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, var(--bg), #edf3ff);
  color: var(--text);
}

header {
  padding: 2rem 1rem 0;
}

h1 {
  text-align: center;
  margin: 0;
  font-size: clamp(2rem, 3vw, 3rem);
}

main {
  display: flex;
  justify-content: center;
  padding: 2rem 1rem 3rem;
}

form {
  width: min(100%, 620px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 12px 30px var(--shadow);
  padding: 2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

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

input,
select,
button {
  font: inherit;
}

input[type='text'],
input[type='email'],
select {
  width: 100%;
  padding: 0.8rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
  color: var(--text);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

input[type='text']:focus,
input[type='email']:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.radio-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
}

.option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fafbff;
}

.option input {
  margin: 0;
}

button {
  width: 100%;
  padding: 0.9rem 1.25rem;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

button:hover {
  background: #1d57bc;
  transform: translateY(-1px);
}

button:focus-visible {
  outline: 3px solid #a4c2ff;
  outline-offset: 2px;
}

footer {
  text-align: center;
  padding: 1rem;
  color: var(--muted);
}

@media (max-width: 480px) {
  form {
    padding: 1.25rem;
  }
}