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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --secondary: #64748b;
  --success: #16a34a;
  --error: #dc2626;
  --background: #f8fafc;
  --surface: #ffffff;
  --bg: #f1f5f9;
  --bg-card: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

header p {
  color: var(--text-muted);
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card h2 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text);
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  transition: all 0.3s ease;
  margin-bottom: 1rem;
}

.drop-zone.drag-over {
  border-color: var(--primary);
  background: rgba(99, 102, 241, 0.1);
}

.drop-zone-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.drop-icon {
  font-size: 3rem;
}

.drop-zone .small {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.file-preview {
  display: none;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  background: rgba(99, 102, 241, 0.1);
  border-radius: 8px;
}

.file-preview:not([hidden]) {
  display: flex;
}

.drop-zone-content[hidden] {
  display: none !important;
}

.file-icon {
  font-size: 1.5rem;
}

.file-name {
  flex: 1;
  font-weight: 500;
  word-break: break-all;
}

.btn-remove {
  background: var(--error);
  color: white;
  border: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  width: 100%;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
  transform: translateY(-1px);
}

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

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

.btn-secondary:hover {
  opacity: 0.9;
}

.file-label .btn {
  width: auto;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

/* Input */
.input-group {
  margin-bottom: 1rem;
}

.input-group input {
  width: 100%;
  padding: 0.875rem 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 1rem;
}

.input-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.input-group input::placeholder {
  color: var(--text-muted);
}

/* Results */
.result-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.result-meta span {
  background: var(--bg);
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
}

.result-text label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.result-text textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.875rem;
  resize: vertical;
}

.result-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1rem;
}

.text-length {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.result-actions .btn {
  width: auto;
}

/* Loading */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: rgba(241, 245, 249, 0.95);
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  z-index: 100;
}

.loading-overlay:not([hidden]) {
  display: flex;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.875rem 1.5rem;
  border-radius: 8px;
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 200;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast.success {
  border-color: var(--success);
  color: var(--success);
}

.toast.error {
  border-color: var(--error);
  color: var(--error);
}

/* Responsive */
@media (max-width: 640px) {
  .container {
    padding: 1rem;
  }
  
  header h1 {
    font-size: 1.5rem;
  }
  
  .card {
    padding: 1rem;
  }
  
  .drop-zone {
    padding: 1.5rem;
  }
}