:root {
  --background-color: #121212;
  --surface-color: #1e1e1e;
  --primary-color: #bb86fc;
  --primary-variant-color: #3700b3;
  --secondary-color: #03dac6;
  --on-background-color: #e0e0e0;
  --on-surface-color: #c7c7c7;
  --border-color: #333;
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  background-color: var(--background-color);
  color: var(--on-background-color);
  font-family: var(--font-family);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 2rem;
}

main {
  background-color: var(--surface-color);
  border-radius: 16px;
  padding: 2rem;
  width: 100%;
  max-width: 1200px;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

header {
  text-align: center;
}

header h1 {
  font-size: 2.5rem;
  color: var(--on-background-color);
  margin-bottom: 0.5rem;
}

header p {
  color: var(--on-surface-color);
  font-size: 1.1rem;
}

.content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.panel {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.panel h2 {
  color: var(--on-surface-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.upload-box, .result-box {
  background-color: var(--background-color);
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  width: 100%;
  aspect-ratio: 9 / 16;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
  transition: border-color 0.3s;
}

.upload-box:hover {
  border-color: var(--primary-color);
  cursor: pointer;
}

#upload-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  color: var(--on-surface-color);
  text-align: center;
  padding: 1rem;
}

#upload-placeholder svg {
  width: 64px;
  height: 64px;
  fill: var(--on-surface-color);
}

#image-preview, #result-image {
  width: 100%;
  height: 100%;
  object-fit: contain;
  position: absolute;
  top: 0;
  left: 0;
}

.result-box {
  border-style: solid;
}

#result-placeholder {
    color: var(--on-surface-color);
    padding: 2rem;
    text-align: center;
}

footer {
  display: flex;
  justify-content: center;
}

button {
  background-color: var(--primary-color);
  color: var(--background-color);
  border: none;
  border-radius: 8px;
  padding: 1rem 2.5rem;
  font-size: 1.2rem;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.1s;
}

button:hover:not(:disabled) {
  background-color: #d0a3ff;
}

button:active:not(:disabled) {
  transform: scale(0.98);
}

button:disabled {
  background-color: #555;
  color: #888;
  cursor: not-allowed;
}

.hidden {
  display: none !important;
}

.loader {
    width: 60px;
    height: 60px;
    border: 5px solid var(--on-surface-color);
    border-bottom-color: var(--primary-color);
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    position: absolute;
}

@keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@media (max-width: 800px) {
  .content {
    grid-template-columns: 1fr;
  }
  
  main {
    padding: 1rem;
  }

  header h1 {
    font-size: 2rem;
  }
}