* {
  box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  margin: 0;
  background: #f5f6f8;
}

.top-bar {
  background: #fff;
  padding: 14px 24px;
  border-bottom: 1px solid #ddd;
}

.container {
  display: flex;
  height: calc(100vh - 60px);
}

/* LEFT */
.preview-panel {
  flex: 1;
  padding: 20px;
  overflow-y: auto;
}

.upload-box {
  display: block;
  border: 2px dashed white;
  border-radius: 14px;
  padding: 25px;
  text-align: center ;
  background: black;
  cursor: pointer;
  margin-bottom: 20px;
}

.upload-box span {
  color: white;
  font-weight: 1000;
}

.upload-box input {
  display:  none;
  color: white
}

.pages {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}

.page {
  width: 150px;
  background: white;
  border-radius: 14px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.12);
  padding: 10px;
  transition: 0.2s;
}

.page.selected {
  outline: 3px solid #007aff;
}

.page canvas {
  width: 100%;
  border-radius: 10px;
}

.page p {
  text-align: center;
  font-size: 13px;
  margin-top: 6px;
}

/* RIGHT */
.control-panel {
  width: 320px;
  padding: 22px;
  background: white;
  backdrop-filter: blur(14px);
  border-left: 1px solid black;
}

.control-panel h3 {
  margin-bottom: 16px;
}

label {
  font-size: 13px;
  margin-top: 10px;
  display: block;
}

input {
  width: 100%;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid black;
  margin-top: 5px;
}

button {
  margin-top: 22px;
  width: 100%;
  padding: 14px;
  border-radius: 14px;
  background: black;
  color: white;
  border: none;
  font-size: 30px;
  cursor: pointer;
}

button:hover {
  background: rgb(137, 211, 27);
}

#status {
  margin-top: 10px;
  font-size: 14px;
}