body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f3f6fb;
}

/* APP */
.app {
  max-width: 420px;
  margin: auto;
  padding: 15px;
}

/* HEADER */
.header {
  text-align: center;
  margin-top: 20px;
}

.header h1 {
  margin: 0;
  color: #2563eb;
}

.header p {
  font-size: 13px;
  color: #64748b;
}

/* CARD */
.card {
  background: white;
  padding: 20px;
  margin-top: 20px;
  border-radius: 18px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

/* INPUT */
input {
  width: 100%;
  padding: 12px;
  margin-top: 8px;
  border-radius: 10px;
  border: 1px solid #ddd;
}

/* BUTTONS */
.btn {
  width: 100%;
  padding: 12px;
  margin-top: 10px;
  border: none;
  border-radius: 10px;
  background: #2563eb;
  color: white;
  font-weight: bold;
  cursor: pointer;
}

.btn:hover {
  background: #1d4ed8;
}

.green {
  background: #25D366;
}

.green:hover {
  background: #1ebe5d;
}

/* RESULT */
.result {
  margin-top: 15px;
  font-size: 14px;
  line-height: 1.6;
}

/* SEO */
.seo {
  background: white;
  margin-top: 20px;
  padding: 15px;
  border-radius: 18px;
  font-size: 13px;
  color: #444;
}