:root {
  --ink: #24292f;
  --muted: #656d76;
  --brand: #0969da;
  --paper: #ffffff;
  --bg: #f6f8fa;
  --border: #d1d9e0;
  --radius: 8px;
  --gap: 16px;
  --container: 800px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    "Hiragino Kaku Gothic ProN", "BIZ UDPGothic", Meiryo, sans-serif;
  line-height: 1.6;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  text-align: center;
  margin-bottom: 40px;
}

h1 {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 600;
  color: var(--ink);
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}

main {
  flex: 1;
}

.upload-area {
  background: var(--paper);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  margin-bottom: 30px;
  transition: border-color 0.2s ease;
}

.upload-area:hover {
  border-color: var(--brand);
}

.upload-area.dragover {
  border-color: var(--brand);
  background: #f0f7ff;
}

.upload-icon {
  font-size: 48px;
  color: var(--muted);
  margin-bottom: 16px;
}

.upload-text {
  color: var(--muted);
  margin-bottom: 12px;
}

.upload-hint {
  color: var(--brand);
  font-size: 14px;
  margin-bottom: 20px;
  font-weight: 500;
}

.file-input {
  display: none;
}

.upload-btn {
  background: var(--brand);
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  transition: background-color 0.2s ease;
}

.upload-btn:hover {
  background: #0858c7;
}

.preview-area {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin-bottom: 20px;
  text-align: center;
  display: none;
}

.preview-title {
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 16px;
  color: var(--ink);
}

.image-preview {
  max-width: 100%;
  max-height: 300px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 12px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.image-info {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 8px;
}

.remove-image {
  background: #dc2626;
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 12px;
  font-weight: 500;
  transition: background-color 0.2s ease;
}

.remove-image:hover {
  background: #b91c1c;
}

.controls {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.btn {
  padding: 10px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--paper);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.btn:hover {
  background: #f3f4f6;
  border-color: #9ca3af;
}

.btn.primary {
  background: var(--brand);
  border-color: var(--brand);
  color: white;
}

.btn.primary:hover {
  background: #0858c7;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.progress {
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  min-height: 20px;
  margin-bottom: 20px;
}

.result-area {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
}

.result-title {
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 16px;
  color: var(--ink);
}

.text-output {
  background: #f8f9fa;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  min-height: 200px;
  white-space: pre-wrap;
  font-family: "Inter", monospace;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
}

.text-output:empty::before {
  content: "OCR結果がここに表示されます...";
  color: var(--muted);
  font-style: italic;
}

.copy-btn {
  margin-top: 12px;
}

.footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.footer p {
  margin: 4px 0;
}

@media (max-width: 768px) {
  .container {
    padding: 16px;
  }

  h1 {
    font-size: 24px;
  }

  .upload-area {
    padding: 30px 16px;
  }

  .controls {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 200px;
  }

  .image-preview {
    max-height: 200px;
  }
}