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

:root {
  --bg-primary: #0a0a1a;
  --bg-secondary: rgba(15, 15, 35, 0.85);
  --bg-message-user: linear-gradient(135deg, #6366f1, #8b5cf6);
  --bg-message-assistant: rgba(255, 255, 255, 0.06);
  --text-primary: #f1f5f9;
  --text-secondary: #a5b4cb;
  --border-color: rgba(255, 255, 255, 0.08);
  --accent: #8b5cf6;
  --accent-secondary: #06b6d4;
  --glow-purple: rgba(139, 92, 246, 0.4);
  --glow-cyan: rgba(6, 182, 212, 0.3);
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

/* Animated gradient background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: linear-gradient(
    -45deg,
    #0f0c29,
    #1a1040,
    #0d2137,
    #0a2a2a,
    #1a0a2e,
    #0f0c29
  );
  background-size: 400% 400%;
  animation: gradientShift 15s ease infinite;
  z-index: -1;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.chat-container {
  width: 100%;
  max-width: 800px;
  height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
}

/* Header */
.chat-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
  background: rgba(255, 255, 255, 0.03);
}

.chat-header h1 {
  font-size: 1.3rem;
  font-weight: 700;
  background: linear-gradient(135deg, #c084fc, #67e8f9);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.chat-header p {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
  font-weight: 400;
}

/* Chat messages area */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Custom scrollbar */
.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background: rgba(139, 92, 246, 0.3);
  border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
  background: rgba(139, 92, 246, 0.5);
}

/* Firefox scrollbar */
.chat-messages {
  scrollbar-width: thin;
  scrollbar-color: rgba(139, 92, 246, 0.3) transparent;
}

/* Messages */
.message {
  display: flex;
  max-width: 80%;
  animation: messageSlideIn 0.3s ease-out;
}

@keyframes messageSlideIn {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.message.user {
  align-self: flex-end;
}

.message.assistant {
  align-self: flex-start;
}

.message-content {
  padding: 0.75rem 1rem;
  border-radius: 1rem;
  line-height: 1.6;
  font-size: 0.95rem;
  white-space: pre-wrap;
  word-break: break-word;
  font-weight: 400;
}

/* User messages — gradient bubble */
.message.user .message-content {
  background: var(--bg-message-user);
  border-bottom-right-radius: 0.25rem;
  box-shadow: 0 2px 16px rgba(99, 102, 241, 0.25);
  color: #fff;
}

/* Assistant messages — glassmorphism */
.message.assistant .message-content {
  background: var(--bg-message-assistant);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-bottom-left-radius: 0.25rem;
  box-shadow: 0 2px 12px rgba(6, 182, 212, 0.08);
}

/* Error messages */
.message.error .message-content {
  background: rgba(239, 68, 68, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(239, 68, 68, 0.2);
  color: #fca5a5;
}

/* Typing indicator */
.typing-indicator {
  display: flex;
  gap: 5px;
  padding: 0.75rem 1rem;
  background: var(--bg-message-assistant);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  border-bottom-left-radius: 0.25rem;
  align-self: flex-start;
  animation: messageSlideIn 0.3s ease-out;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  background: linear-gradient(135deg, #8b5cf6, #06b6d4);
  border-radius: 50%;
  animation: bounce 1.4s infinite ease-in-out;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1); }
}

/* Input area */
.chat-input-area {
  display: flex;
  gap: 0.75rem;
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.03);
}

.chat-input-area textarea {
  flex: 1;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.95rem;
  resize: none;
  max-height: 150px;
  outline: none;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.chat-input-area textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 16px var(--glow-purple), 0 0 4px var(--glow-cyan);
}

.chat-input-area textarea::placeholder {
  color: var(--text-secondary);
}

/* Send button with glow */
.chat-input-area button {
  background: linear-gradient(135deg, #8b5cf6, #06b6d4);
  color: white;
  border: none;
  border-radius: 0.75rem;
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: box-shadow 0.3s, transform 0.15s;
  flex-shrink: 0;
}

.chat-input-area button:hover {
  box-shadow: 0 0 20px var(--glow-purple), 0 0 8px var(--glow-cyan);
  transform: scale(1.05);
}

.chat-input-area button:active {
  transform: scale(0.97);
}

.chat-input-area button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
  transform: none;
}

@media (max-width: 640px) {
  .message { max-width: 90%; }
  .chat-input-area { padding: 0.75rem 1rem; }
}

/* Login screen */
.login-screen {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  width: 100%;
}

.login-card {
  background: var(--bg-secondary);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 1.5rem;
  padding: 3rem 2.5rem;
  text-align: center;
  max-width: 400px;
  width: 90%;
  animation: messageSlideIn 0.4s ease-out;
}

.login-title {
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, #c084fc, #67e8f9);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.25rem;
}

.login-subtitle {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.login-desc {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 2rem;
}

.login-btn {
  background: linear-gradient(135deg, #8b5cf6, #06b6d4);
  color: white;
  border: none;
  border-radius: 0.75rem;
  padding: 0.75rem 2.5rem;
  font-size: 1rem;
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: box-shadow 0.3s, transform 0.15s;
}

.login-btn:hover {
  box-shadow: 0 0 24px var(--glow-purple), 0 0 10px var(--glow-cyan);
  transform: scale(1.03);
}

.login-btn:active {
  transform: scale(0.97);
}

.login-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.login-input {
  width: 100%;
  box-sizing: border-box;
  background: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.login-input::placeholder {
  color: var(--text-secondary);
}

.login-input:focus {
  outline: none;
  border-color: #8b5cf6;
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.25);
}

.login-form .login-btn {
  width: 100%;
  padding: 0.75rem;
  margin-top: 0.25rem;
}

.login-error {
  color: #f87171;
  font-size: 0.85rem;
  margin: 0;
  text-align: left;
}

/* Header with user info */
.chat-header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

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

.logout-btn {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  padding: 0.35rem 0.75rem;
  font-size: 0.75rem;
  font-family: inherit;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.logout-btn:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.2);
}

/* Session cost bar */
.session-cost-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 1.5rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid var(--border-color);
}

#session-cost {
  color: #67e8f9;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* Model selector */
#model-select {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 0.5rem 0.75rem;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.8rem;
  outline: none;
  cursor: pointer;
  transition: border-color 0.3s, box-shadow 0.3s;
  flex-shrink: 0;
  max-width: 180px;
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a5b4cb' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.6rem center;
  padding-right: 2rem;
}

#model-select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--glow-purple);
}

#model-select:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

#model-select option {
  background: #1a1a2e;
  color: var(--text-primary);
}

/* Message metrics - expandable */
.message-bubble {
  display: flex;
  flex-direction: column;
}

.metrics-expandable {
  margin-top: 0.4rem;
}

.metrics-toggle {
  font-size: 0.72rem;
  color: var(--text-secondary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  opacity: 0.7;
  transition: opacity 0.2s;
  padding: 0.15rem 0.25rem;
  user-select: none;
}

.metrics-toggle:hover {
  opacity: 1;
}

.metrics-toggle::-webkit-details-marker {
  display: none;
}

.metrics-toggle::before {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 4px solid var(--text-secondary);
  border-top: 3px solid transparent;
  border-bottom: 3px solid transparent;
  transition: transform 0.2s;
}

details[open] > .metrics-toggle::before {
  transform: rotate(90deg);
}

.metrics-details {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.5rem 0.5rem 0.25rem;
  margin-top: 0.3rem;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 0.5rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.metrics-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.72rem;
}

.metrics-label {
  color: var(--text-secondary);
}

.metrics-value {
  color: #67e8f9;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 640px) {
  #model-select { max-width: 130px; font-size: 0.75rem; }
  .session-cost-bar { padding: 0.4rem 1rem; }
  .metrics-row { font-size: 0.65rem; }
  .metrics-toggle { font-size: 0.65rem; }
}

/* Compare toggle button */
.compare-toggle {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  flex-shrink: 0;
}

.compare-toggle:hover {
  border-color: rgba(255, 255, 255, 0.2);
  color: var(--text-primary);
}

.compare-toggle.active {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.2), rgba(6, 182, 212, 0.2));
  border-color: var(--accent);
  color: #67e8f9;
  box-shadow: 0 0 12px var(--glow-purple);
}

.compare-toggle:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* Comparison grid */
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  width: 100%;
  animation: messageSlideIn 0.3s ease-out;
}

.compare-card {
  background: var(--bg-message-assistant);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 0.75rem;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.compare-card-header {
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  color: #67e8f9;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.compare-response {
  padding: 0.75rem;
  font-size: 0.85rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
  flex: 1;
  max-height: 300px;
  overflow-y: auto;
}

.compare-response::-webkit-scrollbar {
  width: 4px;
}

.compare-response::-webkit-scrollbar-thumb {
  background: rgba(139, 92, 246, 0.3);
  border-radius: 2px;
}

.compare-error {
  color: #fca5a5;
}

.compare-metrics {
  padding: 0.5rem 0.75rem;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.compare-metrics .metrics-row {
  font-size: 0.68rem;
}

@media (max-width: 640px) {
  .compare-grid {
    grid-template-columns: 1fr;
  }
  .compare-response {
    max-height: 200px;
  }
}

/* Metrics section labels */
.metrics-section-label {
  font-size: 0.65rem;
  color: rgba(255, 255, 255, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 0.3rem;
  margin-bottom: 0.1rem;
  padding-bottom: 0.15rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.metrics-section-label:first-child {
  margin-top: 0;
}

/* Quality scores */
.quality-score {
  color: #a78bfa;
}

/* Tab navigation */
.tab-nav {
  display: flex;
  gap: 0;
  margin-top: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.tab-btn {
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-secondary);
  font-family: inherit;
  font-size: 0.8rem;
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}

.tab-btn:hover {
  color: var(--text-primary);
}

.tab-btn.active {
  color: #67e8f9;
  border-bottom-color: #67e8f9;
}

/* Tab panels */
.tab-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

.tab-panel.active {
  display: flex;
}

/* Evaluation tab */
.eval-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.eval-loading {
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.eval-iframe {
  display: none;
  flex: 1;
  width: 100%;
  border: none;
  background: #fff;
  border-radius: 0 0 0.5rem 0.5rem;
}