* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(135deg, #f4f4f4, #ffffff);
  color: #222;
}

.app {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 30px;
}

.card {
  width: 100%;
  max-width: 1050px;
  background: #ffffff;
  border-radius: 24px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.10);
  padding: 30px;
}

.header {
  display: flex;
  align-items: center;
  gap: 18px;
  border-bottom: 1px solid #eee;
  padding-bottom: 22px;
  margin-bottom: 28px;
}

.logo {
  width: 90px;
  height: 90px;
  object-fit: contain;
}

.header h1 {
  margin: 0;
  font-size: 30px;
  color: #222;
}

.header p {
  margin: 6px 0 0;
  color: #d89b26;
  font-weight: 700;
}

.grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 24px;
}

.panel {
  background: #fafafa;
  border: 1px solid #eee;
  border-radius: 18px;
  padding: 24px;
}

.panel h2 {
  margin-top: 0;
  font-size: 20px;
  color: #d89b26;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
}

.field span {
  font-weight: 700;
  font-size: 14px;
}

.field small {
  color: #777;
}

textarea,
input,
select {
  width: 100%;
  border: 1px solid #ddd;
  border-radius: 12px;
  padding: 12px;
  font-size: 15px;
  background: #fff;
}

textarea {
  min-height: 130px;
  resize: vertical;
}

input[type="color"] {
  height: 48px;
  padding: 5px;
  cursor: pointer;
}

.two-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.btn {
  width: 100%;
  border: none;
  background: #d89b26;
  color: white;
  padding: 15px;
  border-radius: 14px;
  font-size: 16px;
  font-weight: 700;
  cursor: pointer;
  transition: 0.2s;
}

.btn:hover {
  background: #bd841d;
  transform: translateY(-1px);
}

.preview {
  text-align: center;
}

.qr-box {
  min-height: 360px;
  background: white;
  border: 2px dashed #ddd;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow: auto;
}

canvas {
  max-width: 100%;
  height: auto;
}

.hint {
  color: #777;
  font-size: 14px;
  margin-top: 16px;
}

@media (max-width: 850px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .header {
    flex-direction: column;
    text-align: center;
  }

  .two-columns {
    grid-template-columns: 1fr;
  }
}