@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #0f1419;
  --bg-card: #151b26;
  --bg-elevated: #1a2130;
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-medium: rgba(255, 255, 255, 0.1);
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent-primary: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.2);
  --success: #10b981;
  --success-glow: rgba(16, 185, 129, 0.2);
  --danger: #ef4444;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, var(--bg-primary) 0%, #0d1117 100%);
  color: var(--text-primary);
  line-height: 1.6;
  padding: 2rem;
  min-height: 100vh;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  background: var(--bg-secondary);
  border-radius: 16px;
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

header {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-elevated) 100%);
  padding: 2rem 2.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

header h1 {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

main {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: 0;
  min-height: 600px;
}

/* Sidebar */
.sidebar {
  background: var(--bg-card);
  border-right: 1px solid var(--border-subtle);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.sidebar h3 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 1rem;
}

/* Radio Card Selector */
.api-selector {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.radio-card {
  display: block;
  cursor: pointer;
  position: relative;
}

.radio-card input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.radio-content {
  display: flex;
  flex-direction: column;
  padding: 1rem;
  background: var(--bg-elevated);
  border: 2px solid var(--border-subtle);
  border-radius: 10px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  gap: 0.25rem;
}

.radio-card input[type="radio"]:checked + .radio-content {
  background: rgba(59, 130, 246, 0.08);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.radio-card:hover .radio-content {
  border-color: var(--border-medium);
  transform: translateX(2px);
}

.radio-title {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.radio-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* Endpoints */
.endpoints {
  margin-top: auto;
}

.endpoint-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem;
  background: var(--bg-elevated);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  font-size: 0.85rem;
  border: 1px solid var(--border-subtle);
}

.method {
  font-weight: 700;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.7rem;
  letter-spacing: 0.03em;
}

.method.post {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
}

.method.get {
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-primary);
}

.path {
  color: var(--text-secondary);
  font-family: 'Courier New', monospace;
  font-size: 0.8rem;
}

/* Tester Section */
.tester {
  padding: 2rem 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.api-form {
  display: none;
  animation: fadeIn 0.3s ease;
}

.api-form.active {
  display: block;
}

.form-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.form-header h2 {
  font-size: 1.5rem;
  font-weight: 600;
}

.badge {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
  letter-spacing: 0.03em;
}

.badge.get {
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent-primary);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input {
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: all 0.2s ease;
  font-family: inherit;
}

.form-group input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

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

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-secondary {
  padding: 0.5rem 1rem;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-medium);
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.btn-secondary:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border-color: var(--border-medium);
}

/* Response Section */
.response-section {
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
}

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

.response-header h3 {
  font-size: 1.125rem;
  font-weight: 600;
}

#responseArea {
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  padding: 1.5rem;
  color: var(--text-primary);
  font-family: 'Courier New', Monaco, monospace;
  font-size: 0.875rem;
  line-height: 1.6;
  overflow: auto;
  max-height: 500px;
  white-space: pre-wrap;
  word-break: break-word;
}

#responseArea::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

#responseArea::-webkit-scrollbar-track {
  background: var(--bg-card);
  border-radius: 4px;
}

#responseArea::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 4px;
}

#responseArea::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Footer */
footer {
  padding: 1.5rem 2.5rem;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-card);
}

footer p {
  color: var(--text-muted);
  font-size: 0.875rem;
  text-align: center;
}

/* Animations */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive */
@media (max-width: 1024px) {
  main {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }

  .api-selector {
    flex-direction: row;
  }

  .endpoints {
    margin-top: 0;
  }
}

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

  header {
    padding: 1.5rem;
  }

  header h1 {
    font-size: 1.5rem;
  }

  .tester {
    padding: 1.5rem;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .api-selector {
    flex-direction: column;
  }
}