* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  background: #f4f4f4;
  color: #222;
}

.container {
  max-width: 760px;
  margin: 48px auto;
  padding: 0 16px;
}

h1 {
  margin: 0;
  font-size: 2rem;
  color: #1f1f1f;
}

.subtitle {
  margin: 10px 0 24px;
  color: #5a5a5a;
}

.dropzone {
  border: 2px dashed #8f8f8f;
  border-radius: 12px;
  background: #eaeaea;
  text-align: center;
  padding: 40px 20px;
  cursor: pointer;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.dropzone.drag-over {
  border-color: #4f4f4f;
  background: #dfdfdf;
}

.dropzone input {
  display: none;
}

.dropzone .hint {
  color: #6a6a6a;
  font-size: 0.9rem;
}

.result {
  margin-top: 18px;
  padding: 16px;
  border-radius: 10px;
  background: #ebebeb;
  border: 1px solid #d8d8d8;
}

button {
  background: #3f3f3f;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.95rem;
  cursor: pointer;
}

button:disabled {
  background: #9d9d9d;
  cursor: not-allowed;
}

#statusText {
  margin: 10px 0 0;
  color: #4b4b4b;
}

.warnings {
  margin-top: 16px;
  padding: 16px;
  border-radius: 10px;
  background: #f0f0f0;
  border: 1px solid #dbdbdb;
}

.warnings h2 {
  margin: 0 0 8px;
  font-size: 1rem;
}

.warnings ul {
  margin: 0;
  padding-left: 18px;
}