:root {
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --glass-bg: rgba(255, 255, 255, 0.9);
  --text-color: #1f2937;
  --text-secondary: #6b7280;
  --border-color: #e5e7eb;
  --success-color: #10b981;
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg-gradient);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  color: var(--text-color);
  padding: 20px;
}

.app-container {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
  width: 100%;
  max-width: 600px;
  padding: 40px;
  text-align: center;
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--primary-color);
}

header p {
  color: var(--text-secondary);
  margin-bottom: 30px;
}

.upload-area {
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  padding: 40px;
  cursor: pointer;
  transition: all 0.3s ease;
  background: #f9fafb;
}

.upload-area:hover, .upload-area.highlight {
  border-color: var(--primary-color);
  background: #eef2ff;
}

.icon-container {
  color: var(--primary-color);
  margin-bottom: 15px;
}

.browse-btn {
  color: var(--primary-color);
  font-weight: 600;
  text-decoration: underline;
}

.limit-info {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-top: 10px;
}

.file-list {
  margin-top: 20px;
  text-align: left;
}

.file-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px;
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 8px;
}

.file-name {
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 200px;
}

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

.remove-btn {
  background: none;
  border: none;
  color: #ef4444;
  cursor: pointer;
  font-size: 1.2rem;
  padding: 0 5px;
}

.primary-btn {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 12px 24px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 20px;
  width: 100%;
  transition: background 0.3s ease;
}

.primary-btn:hover:not(:disabled) {
  background: var(--primary-hover);
}

.primary-btn:disabled {
  background: #a5b4fc;
  cursor: not-allowed;
}

.progress-container {
  margin-top: 20px;
}

.progress-bar {
  height: 8px;
  background: #e5e7eb;
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--success-color);
  width: 0%;
  transition: width 0.3s ease;
}

.progress-text {
  margin-top: 5px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.results-container {
  margin-top: 30px;
}

.actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  margin-bottom: 20px;
}

.secondary-btn {
  background: var(--success-color);
  color: white;
  text-decoration: none;
  padding: 10px 20px;
  border-radius: 8px;
  font-weight: 600;
  display: inline-block;
}

.text-btn {
  background: none;
  border: 1px solid var(--border-color);
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-color);
}

.results-list {
  text-align: left;
  max-height: 300px;
  overflow-y: auto;
}

.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px;
  border-bottom: 1px solid var(--border-color);
}

.download-btn {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}