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

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: #f0f2f5;
  color: #1a1a2e;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

main {
  width: 100%;
  max-width: 480px;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 2px 16px rgba(0,0,0,0.08);
}

h1 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.subtitle {
  color: #666;
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.field {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
}

input, textarea {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1.5px solid #d1d5db;
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

input:focus, textarea:focus {
  border-color: #4f46e5;
  box-shadow: 0 0 0 3px rgba(79,70,229,0.15);
}

input.error, textarea.error {
  border-color: #dc2626;
}

.error-msg {
  display: block;
  color: #dc2626;
  font-size: 0.8rem;
  margin-top: 0.25rem;
  min-height: 1.1em;
}

button {
  width: 100%;
  padding: 0.75rem;
  background: #4f46e5;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

button:hover {
  background: #4338ca;
}

button:active {
  transform: scale(0.98);
}

button:disabled {
  background: #9ca3af;
  cursor: not-allowed;
  transform: none;
}

.result {
  margin-top: 1.25rem;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  text-align: center;
}

.result.success {
  background: #ecfdf5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.result.error {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.hidden {
  display: none;
}