:root {
  --bg-primary: #0f1117;
  --bg-surface: #181b24;
  --bg-surface-elevated: #212532;
  --bg-bubble-user: #2d3345;
  --bg-bubble-bot: #1c202d;
  --border-color: #2e3547;
  --border-subtle: #242938;

  --text-primary: #f0f2f8;
  --text-secondary: #9aa2b6;
  --text-muted: #656d82;

  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Menlo, Consolas, monospace;

  /* Persona accents - Ada by default */
  --persona-accent: #ff2d60;
  --persona-accent-soft: rgba(255, 45, 96, 0.15);
  --persona-accent-glow: rgba(255, 45, 96, 0.35);

  --speed-fast: #10b981;
  --speed-medium: #f59e0b;
  --speed-slow: #ef4444;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --header-height: 64px;
  --hud-height: 48px;
}

/* Persona-specific theme overrides */
body[data-persona="reg"] {
  --persona-accent: #ff5500;
  --persona-accent-soft: rgba(255, 85, 0, 0.15);
  --persona-accent-glow: rgba(255, 85, 0, 0.35);
}

body[data-persona="nuno"] {
  --persona-accent: #8b5cf6;
  --persona-accent-soft: rgba(139, 92, 246, 0.15);
  --persona-accent-glow: rgba(139, 92, 246, 0.35);
}

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

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* App Shell */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 1200px;
  margin: 0 auto;
  background: var(--bg-surface);
  box-shadow: 0 0 60px rgba(0, 0, 0, 0.5);
  border-left: 1px solid var(--border-color);
  border-right: 1px solid var(--border-color);
  position: relative;
}

/* Top App Header */
.app-header {
  height: var(--header-height);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-surface);
  z-index: 20;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo-badge {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-md);
  background: var(--persona-accent-soft);
  color: var(--persona-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 18px;
  border: 1px solid var(--persona-accent);
  box-shadow: 0 0 12px var(--persona-accent-glow);
  transition: all 0.3s ease;
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.badge-beta {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: var(--radius-full);
  background: var(--persona-accent);
  color: #fff;
  letter-spacing: 0.5px;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Persona Selector Tabs */
.persona-selector {
  display: flex;
  background: var(--bg-surface-elevated);
  padding: 3px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
}

.persona-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.2s ease;
}

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

.persona-btn.active {
  background: var(--persona-accent);
  color: #fff;
  box-shadow: 0 2px 8px var(--persona-accent-glow);
}

/* Action Buttons */
.btn-icon-subtle {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-icon-subtle:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
}

/* Benchmark / Latency Telemetry HUD */
.latency-hud {
  min-height: var(--hud-height);
  padding: 8px 20px;
  background: var(--bg-surface-elevated);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 12px;
  z-index: 10;
}

.hud-left {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.metric-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

.metric-label {
  color: var(--text-muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.metric-value {
  font-weight: 700;
  color: var(--text-primary);
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.05);
}

.metric-value.fast { color: var(--speed-fast); }
.metric-value.medium { color: var(--speed-medium); }
.metric-value.slow { color: var(--speed-slow); }

.hud-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.config-select {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 11px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  outline: none;
  cursor: pointer;
}

/* Chat Main View */
.chat-window {
  flex: 1;
  overflow-y: auto;
  padding: 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  scroll-behavior: smooth;
}

/* Welcome Intro Banner */
.welcome-card {
  margin: 10px auto 20px;
  max-width: 680px;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
}

.welcome-persona-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  margin: 0 auto 14px;
  background: var(--persona-accent-soft);
  color: var(--persona-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 26px;
  border: 2px solid var(--persona-accent);
}

.welcome-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}

.welcome-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 20px;
}

.suggestion-chips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 10px;
  text-align: left;
}

.chip-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  font-size: 13px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chip-btn:hover {
  border-color: var(--persona-accent);
  transform: translateY(-1px);
  background: var(--persona-accent-soft);
}

/* Chat Messages */
.message-row {
  display: flex;
  gap: 12px;
  max-width: 820px;
  width: 100%;
}

.message-row.user {
  margin-left: auto;
  justify-content: flex-end;
}

.message-row.bot {
  margin-right: auto;
  justify-content: flex-start;
}

.message-avatar {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  background: var(--persona-accent);
  color: #fff;
}

.message-content-wrapper {
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.message-bubble {
  padding: 14px 18px;
  border-radius: var(--radius-lg);
  font-size: 14.5px;
  line-height: 1.6;
  word-break: break-word;
  position: relative;
}

.message-row.user .message-bubble {
  background: var(--bg-bubble-user);
  color: #ffffff;
  border-bottom-right-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.message-row.bot .message-bubble {
  background: var(--bg-bubble-bot);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
  border: 1px solid var(--border-color);
}

/* Typing / Cursor animation */
.streaming-cursor {
  display: inline-block;
  width: 7px;
  height: 15px;
  background: var(--persona-accent);
  margin-left: 4px;
  vertical-align: middle;
  animation: cursorBlink 0.8s infinite;
}

@keyframes cursorBlink {
  0%, 100% { opacity: 0; }
  50% { opacity: 1; }
}

/* Per-Message Telemetry Footer */
.message-footer-stats {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  padding: 0 4px;
}

.copy-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
  transition: all 0.2s;
}

.copy-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.08);
}

/* Product Cards Container */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin-top: 10px;
}

.product-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: all 0.2s ease;
}

.product-card:hover {
  border-color: var(--persona-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.product-thumb {
  width: 100%;
  height: 120px;
  object-fit: cover;
  background: #111;
}

.product-info {
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.product-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
  line-height: 1.3;
}

.product-price {
  font-size: 13px;
  font-weight: 700;
  color: var(--persona-accent);
  margin-top: auto;
  margin-bottom: 10px;
}

.product-cta-btn {
  display: block;
  text-align: center;
  background: var(--persona-accent);
  color: #fff;
  text-decoration: none;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: opacity 0.2s ease;
}

.product-cta-btn:hover {
  opacity: 0.9;
}

/* Input Area */
.chat-input-container {
  padding: 16px 20px 20px;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  position: relative;
  z-index: 20;
}

.input-box-wrapper {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 8px 12px;
  display: flex;
  align-items: flex-end;
  gap: 10px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
  transition: border-color 0.2s ease;
}

.input-box-wrapper:focus-within {
  border-color: var(--persona-accent);
}

.chat-textarea {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14.5px;
  resize: none;
  max-height: 140px;
  min-height: 24px;
  line-height: 1.5;
  padding: 6px 4px;
}

.chat-textarea::placeholder {
  color: var(--text-muted);
}

.btn-mic {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.1rem;
  transition: all 0.2s ease;
}

.btn-mic:hover {
  color: var(--text-primary);
  border-color: var(--persona-accent);
  transform: scale(1.05);
}

.btn-mic.recording {
  background: #ef4444;
  color: #fff;
  border-color: #ef4444;
  animation: pulseMic 1.2s infinite;
}

.btn-mic.active {
  background: #10b981;
  color: #fff;
  border-color: #059669;
  animation: pulseLive 1.5s infinite;
}

.btn-mic.speaking {
  background: #3b82f6;
  color: #fff;
  border-color: #2563eb;
  animation: pulseSpeaking 1.2s infinite;
}

.btn-mic.bot-speaking {
  background: #8b5cf6;
  color: #fff;
  border-color: #7c3aed;
  animation: pulseBotSpeak 1.4s infinite;
}

@keyframes pulseSpeaking {
  0% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(59, 130, 246, 0); }
  100% { box-shadow: 0 0 0 0 rgba(59, 130, 246, 0); }
}

@keyframes pulseBotSpeak {
  0% { box-shadow: 0 0 0 0 rgba(139, 92, 246, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(139, 92, 246, 0); }
  100% { box-shadow: 0 0 0 0 rgba(139, 92, 246, 0); }
}

@keyframes pulseLive {
  0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

@keyframes pulseMic {
  0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.6); }
  70% { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.btn-send {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: var(--persona-accent);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s ease;
}

.btn-send:disabled {
  background: var(--bg-surface);
  color: var(--text-muted);
  cursor: not-allowed;
  border: 1px solid var(--border-color);
}

.btn-send:not(:disabled):hover {
  transform: scale(1.05);
  box-shadow: 0 0 12px var(--persona-accent-glow);
}

/* Diagnostics Modal / Drawer */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 20px;
  backdrop-filter: blur(4px);
}

.modal-overlay.open {
  display: flex;
}

.modal-content {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 800px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h3 {
  font-size: 16px;
  font-weight: 700;
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 20px;
  cursor: pointer;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  font-family: var(--font-mono);
  font-size: 12px;
}

.json-box {
  background: var(--bg-primary);
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 250px;
  overflow-y: auto;
  margin-bottom: 16px;
  color: #a5b4fc;
}

/* Markdown styling inside bubbles */
.message-bubble p { margin-bottom: 8px; }
.message-bubble p:last-child { margin-bottom: 0; }
.message-bubble strong { font-weight: 700; color: #fff; }
.message-bubble ul, .message-bubble ol { margin: 8px 0 8px 20px; }
.message-bubble li { margin-bottom: 4px; }
.message-bubble a { color: var(--persona-accent); text-decoration: underline; }
.message-bubble code {
  background: rgba(0, 0, 0, 0.3);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12.5px;
}

/* Mobile Adjustments */
@media (max-width: 768px) {
  .app-header { padding: 0 12px; }
  .latency-hud { padding: 6px 12px; }
  .chat-window { padding: 16px 12px; }
  .chat-input-container { padding: 10px 12px 14px; }
  .hud-left { gap: 10px; }
  .metric-label { font-size: 10px; }
  .metric-value { font-size: 11px; }
  .brand-title { display: none; }
}