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

:root {
  --primary-blue: #0066cc;
  --ocean-blue: #006bb3;
  --light-blue: #e6f3ff;
  --dark-blue: #004d99;
  --accent-blue: #0080ff;
  --white: #ffffff;
  --light-gray: #f8fafc;
  --gray: #64748b;
  --dark-gray: #334155;
  --border: #e2e8f0;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--dark-gray);
  background: linear-gradient(135deg, var(--light-blue) 0%, var(--white) 100%);
  min-height: 100vh;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header Styles */
.header {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--ocean-blue) 100%);
  color: var(--white);
  padding: 3rem 0;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.header-content {
  max-width: 800px;
  margin: 0 auto;
}

.logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.logo i {
  font-size: 2.5rem;
  color: var(--light-blue);
}

.logo h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.subtitle {
  font-size: 1.125rem;
  opacity: 0.9;
  font-weight: 300;
}

/* Main Content */
.main-content {
  padding: 3rem 0;
}

/* Card Styles */
.card {
  background: var(--white);
  border-radius: 16px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header {
  background: linear-gradient(135deg, var(--light-blue) 0%, rgba(0, 102, 204, 0.1) 100%);
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.card-header i {
  color: var(--primary-blue);
  font-size: 1.25rem;
}

.card-header h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--dark-gray);
}

.card-body {
  padding: 2rem;
}

/* Input Styles */
.input-group {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.url-input {
  flex: 1;
  padding: 0.875rem 1rem;
  border: 2px solid var(--border);
  border-radius: 12px;
  font-size: 1rem;
  transition: all 0.3s ease;
  background: var(--white);
}

.url-input:focus {
  outline: none;
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.generate-btn {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--ocean-blue) 100%);
  color: var(--white);
  border: none;
  padding: 0.875rem 2rem;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.generate-btn:hover {
  background: linear-gradient(135deg, var(--ocean-blue) 0%, var(--dark-blue) 100%);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.generate-btn:active {
  transform: translateY(0);
}

/* Loading Styles */
.loading {
  text-align: center;
  padding: 3rem;
  color: var(--primary-blue);
}

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

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

/* Results Section */
.results-section {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

.result-card {
  background: var(--white);
  border-radius: 16px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: all 0.3s ease;
}

.result-card:hover {
  box-shadow: var(--shadow-lg);
}

.result-header {
  background: linear-gradient(135deg, var(--light-blue) 0%, rgba(0, 102, 204, 0.05) 100%);
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.result-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.result-title i {
  color: var(--primary-blue);
  font-size: 1.125rem;
}

.result-title h3 {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--dark-gray);
}

.download-btn {
  background: var(--primary-blue);
  color: var(--white);
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.download-btn:hover {
  background: var(--ocean-blue);
  transform: translateY(-1px);
}

.result-content {
  padding: 1.5rem;
}

.result-content textarea {
  width: 100%;
  height: 200px;
  padding: 1rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
  font-size: 0.875rem;
  line-height: 1.5;
  resize: vertical;
  background: var(--light-gray);
  color: var(--dark-gray);
}

.result-content textarea:focus {
  outline: none;
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.result-count {
  margin-top: 1rem;
  padding: 0.75rem;
  background: var(--light-blue);
  border-radius: 8px;
  text-align: center;
  font-weight: 500;
  color: var(--primary-blue);
}

.result-count span {
  font-weight: 700;
  font-size: 1.125rem;
}

/* Error Message */
.error-message {
  background: #fee2e2;
  border: 1px solid #fecaca;
  color: #dc2626;
  padding: 1rem;
  border-radius: 12px;
  margin-top: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.error-message i {
  font-size: 1.25rem;
}

/* Footer */
.footer {
  background: var(--dark-gray);
  color: var(--white);
  text-align: center;
  padding: 2rem 0;
  margin-top: 4rem;
}

.footer p {
  opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 0.75rem;
  }
  
  .logo h1 {
    font-size: 2rem;
  }
  
  .input-group {
    flex-direction: column;
  }
  
  .format-options {
    justify-content: center;
  }
  
  .result-header {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
  
  .result-content textarea {
    height: 150px;
  }
}

@media (max-width: 480px) {
  .header {
    padding: 2rem 0;
  }
  
  .logo {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .logo h1 {
    font-size: 1.75rem;
  }
  
  .subtitle {
    font-size: 1rem;
  }
  
  .main-content {
    padding: 2rem 0;
  }
}