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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: #f5f5f5;
  color: #333;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 20px;
}

.container {
  width: 100%;
  max-width: 480px;
  background: #fff;
  border-radius: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.header {
  background: #4a90d9;
  color: #fff;
  padding: 24px 20px;
  text-align: center;
}

.header h1 {
  font-size: 20px;
  font-weight: 600;
}

.header .icon {
  font-size: 32px;
  margin-bottom: 8px;
}

.content {
  padding: 24px 20px;
}

.description {
  color: #666;
  font-size: 14px;
  margin-bottom: 20px;
  text-align: center;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  color: #666;
  margin-bottom: 6px;
}

.form-group textarea,
.form-group input {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 8px;
  font-size: 16px;
  transition: border-color 0.2s;
}

.form-group textarea {
  min-height: 100px;
  resize: vertical;
  font-family: inherit;
}

.form-group textarea:focus-visible,
.form-group input:focus-visible {
  outline: 2px solid #4a90d9;
  outline-offset: 2px;
  border-color: #4a90d9;
}

.form-group textarea:focus,
.form-group input:focus {
  border-color: #4a90d9;
}

.form-group textarea::placeholder,
.form-group input::placeholder {
  color: #aaa;
}

.submit-btn {
  width: 100%;
  padding: 14px;
  background: #4a90d9;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.submit-btn:hover {
  background: #3a7bc8;
}

.submit-btn:disabled {
  background: #ccc;
  cursor: not-allowed;
}

.footer {
  padding: 16px 20px;
  text-align: center;
  color: #999;
  font-size: 12px;
  border-top: 1px solid #eee;
}

.success-message,
.error-message {
  padding: 12px;
  border-radius: 8px;
  margin-bottom: 16px;
  text-align: center;
  font-size: 14px;
}

.success-message {
  background: #e8f5e9;
  color: #2e7d32;
}

.error-message {
  background: #ffebee;
  color: #c62828;
}

.hidden {
  display: none;
}

@media (max-width: 520px) {
  body {
    padding: 10px;
  }
}