*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
}

body {
  font-family: Helvetica, Arial, sans-serif;
  letter-spacing: 0.50px;
  color: #1C1B1F;
  background: #FFFBFE;
  overflow: hidden;
}

#drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  margin: 20px;
  height: calc(100vh - 40px);
  background: #FFFBFE;
  border: 2px dashed #79747E;
  border-radius: 28px;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  user-select: none;
  outline: none;
}

#drop-zone.drag-over {
  border-color: #6750A4;
  background: #E8E0F0;
}

#drop-zone:focus-visible {
  outline: 3px solid #6750A4;
  outline-offset: -4px;
}

#file-input { display: none; }

.drop-title {
  font-size: 1.125rem;
  font-weight: 500;
  color: #1C1B1F;
  margin-bottom: 4px;
}

.drop-sub {
  font-size: 1rem;
  color: #49454F;
  margin: 1rem;
}

.browse-btn, #download-btn {
  display: inline-block;
  font-size: 1.125rem;
  font-weight: 500;
  padding: 10px 24px;
  border-radius: 100px;
  cursor: pointer;
  border: 1px solid #79747E;
  transition: background 0.2s, box-shadow 0.2s;
}

.browse-btn:hover, #download-btn:hover {
  box-shadow: 0 1px 2px rgba(0,0,0,0.3), 0 1px 3px 1px rgba(0,0,0,0.15);
}

.browse-btn {
  color: #5B4397;
  background: transparent;
}

.browse-btn:hover {
  background: rgba(103, 80, 164, 0.08);
}

.browse-btn:active {
  background: rgba(103, 80, 164, 0.12);
}

#download-btn {
  color: #FFFBFE;
  background: #5B4397;
  margin-top: 4rem;
}

#download-btn:hover { 
  background: #4a3880; 
}

#download-btn:active { 
  background: #3d2e6b; 
}

#error-message {
  display: none;
  position: fixed;
  bottom: 3rem;
  left: 50%;
  transform: translateX(-50%);
  width: max-content;
  max-width: calc(100vw - 4rem);
  text-align: center;
  font-size: 1rem;
  color: #9E2219;
  background: #FFFBFE;
  border: 1px solid #9E2219;
  border-radius: 4px;
  padding: 10px 20px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}

@media (prefers-color-scheme: dark) {
  body { color: #E6E1E5; background: #1C1B1F; }
  #drop-zone { background: #1C1B1F; border-color: #938F99; }
  #drop-zone.drag-over { background: #2B2930; border-color: #D0BCFF; }
  .drop-title { color: #E6E1E5; }
  .drop-sub { color: #CAC4D0; }
  .browse-btn { border-color: #938F99; color: #D0BCFF; }
  .browse-btn:hover { background: rgba(208, 188, 255, 0.08); }
  .browse-btn:active { background: rgba(208, 188, 255, 0.12); }
  #download-btn { border-color: #938F99; color: #1C1B1F; background: #D0BCFF; }
  #download-btn:hover { background: #b9a4e8; }
  #download-btn:active { background: #a48fd4; }  
  #error-message { background: #1C1B1F; border-color: #F2B8B5; color: #F2B8B5; }
}