body {
  background: linear-gradient(135deg, #667eea, #764ba2);
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 15px;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
.card {
  background: #fff;
  padding: 20px;
  max-width: 100%;
  width: 400px;
  border-radius: 16px;
  box-shadow: 0 0 30px rgba(0, 0, 0, 0.15);
  animation: fadeIn 1s;
  margin-top: 20px;
  margin-bottom: 5px;
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
h2 {
  font-size: 20px;
  text-align: center;
  color: #333;
  margin-bottom: 15px;
}
.statement-box {
  background: #fff8f0;
  border-left: 4px solid #f87171;
  padding: 12px 14px;
  font-size: 13px;
  color: #6b021d;
  border-radius: 8px;
  margin-bottom: 14px;
}
.statement-box strong {
  font-size: 14px;
  display: block;
  margin-bottom: 5px;
}
.info-note {
  font-size: 13px;
  text-align: center;
  color: #4b5563;
  margin-bottom: 15px;
}
form {
  display: flex;
  flex-direction: column;
}
label {
  font-size: 14px;
  margin-bottom: 4px;
}
input[type="email"] {
  padding: 10px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 6px;
  margin-bottom: 10px;
}
input[type="email"].sent {
  background-color: #e6ffe6;
  background-image: url('data:image/svg+xml;utf8,<svg fill="%23008000" height="18" viewBox="0 0 24 24" width="18" xmlns="http://www.w3.org/2000/svg"><path d="M20.29 5.71a1 1 0 00-1.42 0L9 15.59l-3.29-3.3a1 1 0 00-1.42 1.42l4 4a1 1 0 001.42 0l11-11a1 1 0 000-1.42z"/></svg>');
  background-repeat: no-repeat;
  background-position: right 10px center;
  background-size: 18px;
  color: #008000;
}
button {
  padding: 10px;
  font-size: 15px;
  border: none;
  border-radius: 6px;
  background-color: #22c55e;
  color: #fff;
  cursor: pointer;
}
button:hover:not(:disabled) {
  background-color: #16a34a;
}
button:disabled {
  background-color: #94d3a2;
  cursor: not-allowed;
}
#responseMessage {
  font-size: 13px;
  margin-bottom: 10px;
  opacity: 0;
  transition: opacity 0.6s ease;
}
#responseMessage.visible {
  opacity: 1;
}
footer {
  font-size: 12px;
  color: #ddd;
  text-align: center;
  padding: 7px 10px;
  line-height: 1.6;
  background: #333;
  border-top: 1px solid #444;
  border-bottom: 4px solid #444;
  width: 100%;
  border-radius: 8px;
}
footer a {
  color: #bbb;
  text-decoration: none;
}
footer a:hover {
  text-decoration: underline;
}