* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background: #f4f6f8;
  color: #202124;
}

.container {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 32px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.intro {
  margin: 0 0 28px;
  color: #5f6368;
}

.form-group {
  margin-bottom: 26px;
}

label,
legend {
  display: block;
  font-weight: 600;
  margin-bottom: 10px;
  line-height: 1.45;
}

legend {
  padding: 0;
}

.required {
  color: #c62828;
}

textarea,
input[type="file"] {
  width: 100%;
  font: inherit;
}

textarea {
  resize: vertical;
  min-height: 110px;
  padding: 12px;
  border: 1px solid #b8bec5;
  border-radius: 7px;
  outline: none;
}

textarea:focus {
  border-color: #1a73e8;
  box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.12);
}

input[type="file"] {
  padding: 10px 0;
}

.checkbox-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.checkbox-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 0;
  padding: 12px;
  border: 1px solid #e0e3e7;
  border-radius: 7px;
  cursor: pointer;
  font-weight: 400;
}

.checkbox-item:hover {
  background: #f8f9fa;
}

.checkbox-item input {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  margin: 1px 0 0;
}

.help {
  margin-top: 2px;
  font-size: 13px;
  color: #6b7280;
}

.file-list {
  margin: 12px 0 0;
  padding-left: 20px;
}

.file-list li {
  margin: 5px 0;
  overflow-wrap: anywhere;
}

.error {
  min-height: 18px;
  margin-top: 6px;
  color: #c62828;
  font-size: 13px;
}

.actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 32px;
}

.btn {
  min-width: 120px;
  min-height: 46px;
  border: 0;
  border-radius: 7px;
  padding: 10px 20px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.btn-primary {
  background: #1a73e8;
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: #1557b0;
}

.btn-secondary {
  background: #e9ecef;
  color: #202124;
}

.btn-secondary:hover {
  background: #dfe3e8;
}

.form-message {
  margin-top: 18px;
  min-height: 20px;
  font-size: 14px;
}

.form-message.info {
  color: #1a73e8;
}

.form-message.error-message {
  color: #c62828;
}

.response-card {
  text-align: center;
  padding: 56px 32px;
}

.response-card p {
  margin: 12px 0 28px;
  color: #5f6368;
}

.success-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  margin-bottom: 18px;
  border-radius: 50%;
  background: #e6f4ea;
  color: #188038;
  font-size: 34px;
  font-weight: bold;
}

@media (max-width: 600px) {
  .container {
    padding: 10px;
  }

  .card {
    padding: 22px 16px;
    border-radius: 8px;
  }

  h1 {
    font-size: 24px;
  }

  .actions {
    flex-direction: column-reverse;
  }

  .btn {
    width: 100%;
  }
}