:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-tertiary: #ffffff;
  --text-primary: #1a1a1a;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  --border-color: #e5e5e5;
  --accent-color: #2563eb;
  --accent-hover: #1d4ed8;
  --error-color: #dc2626;
  --success-color: #16a34a;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-tertiary: #262626;
  --text-primary: #f5f5f5;
  --text-secondary: #a3a3a3;
  --text-tertiary: #737373;
  --border-color: #404040;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --error-color: #ef4444;
  --success-color: #22c55e;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.3);
}

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

body,
input,
textarea,
button {
  font-family: "Cantarell", sans-serif;
}

body {
  /* font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif; */

  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  text-decoration: none;
  color: var(--text-primary);
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1rem;
  min-height: 100vh;
}

.help-button {
  position: fixed;
  top: 2rem;
  right: 5.5rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  width: 46px;
  height: 46px;
}

.help-button:hover {
  background-color: var(--bg-secondary);
}

.theme-toggle {
  position: fixed;
  top: 2rem;
  right: 2rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
}

.sun-icon,
.moon-icon {
  display: none;
  color: var(--text-primary);
}

[data-theme="light"] .sun-icon,
[data-theme="dark"] .moon-icon {
  display: block;
}

.header {
  text-align: center;
  margin-bottom: 3rem;
}

.title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.submit-button:click {
  background-color: red;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.upload-area {
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  padding: 3rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background-color: var(--bg-secondary);
  margin-bottom: 10px;
}

.upload-area:hover {
  border-color: var(--accent-color);
  background-color: var(--bg-tertiary);
}

.upload-area.drag-over {
  border-color: var(--accent-color);
  background-color: var(--bg-tertiary);
}

.upload-icon {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.upload-text {
  font-size: 1.125rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.upload-hint {
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

.loading-section {
  text-align: center;
  padding: 4rem 2rem;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-color);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  margin: 0 auto 1.5rem;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-text {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

.results-section {
  animation: fadeIn 0.3s ease;
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.results-title {
  font-size: 1.875rem;
  font-weight: 600;
}

.results-actions {
  display: flex;
  gap: 0.75rem;
}

.feedback-container {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  white-space: pre-wrap;
  word-wrap: break-word;
  line-height: 1.8;
  font-size: 1rem;
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.error-section {
  animation: fadeIn 0.3s ease;
}

.error-content {
  text-align: center;
  padding: 3rem 2rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--error-color);
  border-radius: 12px;
}

.error-icon {
  color: var(--error-color);
  margin-bottom: 1rem;
}

.error-title {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--error-color);
  margin-bottom: 0.75rem;
}

.error-message {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 1rem;
}

.btn {
  padding: 0.625rem 1.25rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

.btn-primary:hover {
  background-color: var(--accent-hover);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-secondary);
}

.hidden {
  display: none !important;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 1rem;
  }

  .title {
    font-size: 2rem;
  }

  .subtitle {
    font-size: 1rem;
  }

  .upload-area {
    padding: 2rem 1rem;
  }

  .results-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .results-actions {
    width: 100%;
  }

  .btn {
    flex: 1;
    justify-content: center;
  }

  .help-button {
    top: 1rem;
    right: 4.5rem;
    margin-bottom: 6px;
  }

  .theme-toggle {
    top: 1rem;
    right: 1rem;
  }

  .feedback-container {
    padding: 1.5rem;
    font-size: 0.875rem;
  }
}

.help-content {
  max-width: 600px;
  margin: 0 auto;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.description-section {
  margin-bottom: 3rem;
}

.description-text {
  color: var(--text-secondary);
  line-height: 1.7;
  font-size: 1rem;
}

.contact-section {
  margin-bottom: 3rem;
}

.contact-form {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: var(--shadow-sm);
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--text-primary);
  font-size: 0.875rem;
}

input,
textarea {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 0.875rem;
  transition: border-color 0.2s ease;
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent-color);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.file-upload-area {
  border: 2px dashed var(--border-color);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background-color: var(--bg-tertiary);
  position: relative;
}

.file-upload-area:hover {
  border-color: var(--accent-color);
  background-color: var(--bg-primary);
}

.file-upload-area.drag-over {
  border-color: var(--accent-color);
  background-color: var(--bg-primary);
}

.file-upload-text {
  color: var(--text-secondary);
  font-size: 0.875rem;
  display: block;
}

.file-input {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.download-section {
  margin-bottom: 2rem;
}

.download-btn {
  width: 100%;
  justify-content: center;
}

@media (max-width: 640px) {
  .help-content {
    max-width: 100%;
  }

  .contact-form {
    padding: 1.5rem;
  }

  .file-upload-area {
    padding: 1.5rem;
  }
}