/* ===================================
   SCALER PERSONA CHAT — STYLESHEET
   =================================== */

:root {
  /* Core palette */
  --bg-primary: #0a0b0f;
  --bg-secondary: #111318;
  --bg-card: #161922;
  --bg-hover: #1e2230;
  --bg-input: #1a1d28;

  /* Persona accent colors */
  --anshuman-primary: #6366f1;
  --anshuman-glow: rgba(99, 102, 241, 0.25);
  --anshuman-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);

  --abhimanyu-primary: #14b8a6;
  --abhimanyu-glow: rgba(20, 184, 166, 0.25);
  --abhimanyu-gradient: linear-gradient(135deg, #14b8a6, #06b6d4);

  --kshitij-primary: #f59e0b;
  --kshitij-glow: rgba(245, 158, 11, 0.25);
  --kshitij-gradient: linear-gradient(135deg, #f59e0b, #ef4444);

  /* Active persona (defaults to anshuman) */
  --persona-primary: var(--anshuman-primary);
  --persona-glow: var(--anshuman-glow);
  --persona-gradient: var(--anshuman-gradient);

  /* Text */
  --text-primary: #f0f2f8;
  --text-secondary: #8b91a8;
  --text-muted: #545869;

  /* Borders */
  --border-subtle: rgba(255, 255, 255, 0.06);
  --border-active: rgba(255, 255, 255, 0.12);

  /* Shadows */
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px var(--persona-glow);

  /* Layout */
  --sidebar-width: 300px;
  --border-radius: 16px;
  --border-radius-sm: 10px;
  --border-radius-xs: 6px;

  /* Transitions */
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Persona theme classes */
.theme-anshuman { --persona-primary: var(--anshuman-primary); --persona-glow: var(--anshuman-glow); --persona-gradient: var(--anshuman-gradient); }
.theme-abhimanyu { --persona-primary: var(--abhimanyu-primary); --persona-glow: var(--abhimanyu-glow); --persona-gradient: var(--abhimanyu-gradient); }
.theme-kshitij { --persona-primary: var(--kshitij-primary); --persona-glow: var(--kshitij-glow); --persona-gradient: var(--kshitij-gradient); }

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

html, body {
  height: 100%;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
}

/* ===== BACKGROUND BLOBS ===== */
.bg-blob {
  position: fixed;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.08;
  pointer-events: none;
  z-index: 0;
  transition: background 0.5s ease;
}
.blob-1 {
  width: 600px; height: 600px;
  background: var(--persona-primary);
  top: -200px; left: -100px;
}
.blob-2 {
  width: 400px; height: 400px;
  background: var(--persona-primary);
  bottom: -100px; right: 200px;
  opacity: 0.05;
}
.blob-3 {
  width: 300px; height: 300px;
  background: #8b5cf6;
  top: 50%; right: -100px;
  opacity: 0.04;
}

/* ===== APP WRAPPER ===== */
.app-wrapper {
  display: flex;
  height: 100vh;
  position: relative;
  z-index: 1;
}

/* ===== SIDEBAR ===== */
.sidebar {
  width: var(--sidebar-width);
  min-width: var(--sidebar-width);
  background: var(--bg-secondary);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform var(--transition);
  z-index: 100;
}

.sidebar-header {
  padding: 28px 24px 20px;
  border-bottom: 1px solid var(--border-subtle);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.logo-icon {
  font-size: 22px;
  filter: drop-shadow(0 0 8px var(--persona-primary));
  transition: filter var(--transition);
}
.logo-text {
  font-size: 18px;
  font-weight: 800;
  background: var(--persona-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  transition: background var(--transition);
}
.sidebar-tagline {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 400;
}

/* ===== PERSONA NAV ===== */
.persona-nav {
  flex: 1;
  padding: 20px 16px;
  overflow-y: auto;
}
.nav-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 12px;
  padding: 0 8px;
}

.persona-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 12px;
  border-radius: var(--border-radius-sm);
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  color: var(--text-secondary);
  text-align: left;
  transition: all var(--transition);
  position: relative;
  margin-bottom: 6px;
}
.persona-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--border-subtle);
}
.persona-btn.active {
  background: var(--bg-hover);
  border-color: var(--border-active);
  color: var(--text-primary);
  box-shadow: 0 0 0 1px var(--border-subtle) inset;
}
.persona-btn .active-dot {
  display: none;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--persona-primary);
  box-shadow: 0 0 8px var(--persona-primary);
  margin-left: auto;
  flex-shrink: 0;
}
.persona-btn.active .active-dot { display: block; }

/* Avatars */
.persona-avatar {
  width: 40px; height: 40px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 700;
  flex-shrink: 0;
  letter-spacing: 0.02em;
}
.anshuman-avatar {
  background: var(--anshuman-gradient);
  color: #fff;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
}
.abhimanyu-avatar {
  background: var(--abhimanyu-gradient);
  color: #fff;
  box-shadow: 0 4px 12px rgba(20, 184, 166, 0.35);
}
.kshitij-avatar {
  background: var(--kshitij-gradient);
  color: #fff;
  box-shadow: 0 4px 12px rgba(245, 158, 11, 0.35);
}

.persona-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow: hidden;
}
.persona-name {
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.persona-role {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===== SIDEBAR FOOTER ===== */
.sidebar-footer {
  padding: 20px 16px;
  border-top: 1px solid var(--border-subtle);
}
.api-key-section {}
.api-key-label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.key-icon { margin-right: 4px; }
.api-key-input-wrapper {
  display: flex;
  gap: 8px;
}
.api-key-input-wrapper input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-xs);
  color: var(--text-primary);
  font-size: 12px;
  padding: 8px 10px;
  outline: none;
  font-family: 'Inter', monospace;
  transition: border-color var(--transition);
  min-width: 0;
}
.api-key-input-wrapper input:focus {
  border-color: var(--persona-primary);
}
.api-key-input-wrapper input::placeholder { color: var(--text-muted); }
#save-key-btn {
  padding: 8px 12px;
  background: var(--persona-gradient);
  border: none;
  border-radius: var(--border-radius-xs);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: opacity var(--transition), transform var(--transition);
}
#save-key-btn:hover { opacity: 0.9; transform: translateY(-1px); }
#save-key-btn:active { transform: translateY(0); }
.api-key-hint {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 6px;
}

/* ===== MOBILE SIDEBAR TOGGLE ===== */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 16px; left: 16px;
  z-index: 200;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}
.sidebar-toggle span {
  display: block;
  width: 20px; height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== MAIN CHAT AREA ===== */
.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

/* ===== CHAT HEADER ===== */
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: rgba(10, 11, 15, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  flex-shrink: 0;
}
.chat-header-persona {
  display: flex;
  align-items: center;
  gap: 14px;
}
.header-avatar {
  width: 44px; height: 44px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
  box-shadow: var(--shadow-glow);
  transition: box-shadow var(--transition);
}
.header-persona-info {}
.header-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}
.header-role {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}
.online-badge {
  display: flex;
  align-items: center;
  gap: 5px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.2);
  border-radius: 20px;
  padding: 4px 10px;
  font-size: 11px;
  color: #10b981;
  font-weight: 500;
}
.online-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 6px #10b981;
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.clear-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius-xs);
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  transition: all var(--transition);
  font-family: 'Inter', sans-serif;
}
.clear-btn:hover {
  border-color: #ef4444;
  color: #ef4444;
  background: rgba(239, 68, 68, 0.08);
}

/* ===== MESSAGES CONTAINER ===== */
.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  scroll-behavior: smooth;
}
.messages-container::-webkit-scrollbar { width: 4px; }
.messages-container::-webkit-scrollbar-track { background: transparent; }
.messages-container::-webkit-scrollbar-thumb { background: var(--border-subtle); border-radius: 2px; }

/* ===== WELCOME SCREEN ===== */
.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 40px 20px;
  max-width: 600px;
  margin: auto;
  animation: fadeInUp 0.4s ease;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.welcome-avatar {
  width: 80px; height: 80px;
  border-radius: 24px;
  font-size: 28px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 8px 32px var(--persona-glow);
  margin-bottom: 20px;
  transition: all var(--transition);
}
.welcome-title {
  font-size: 26px;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 10px;
}
.welcome-title span {
  background: var(--persona-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.welcome-subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 460px;
  margin-bottom: 32px;
}

/* ===== CHIPS ===== */
.chips-section {}
.chips-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.chips-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}
.chip {
  padding: 8px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: 'Inter', sans-serif;
  text-align: left;
  line-height: 1.4;
}
.chip:hover {
  background: var(--bg-hover);
  border-color: var(--persona-primary);
  color: var(--persona-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--persona-glow);
}

/* ===== MESSAGES ===== */
.message {
  display: flex;
  gap: 12px;
  animation: slideIn 0.25s ease;
  max-width: 760px;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.message.user-message {
  flex-direction: row-reverse;
  align-self: flex-end;
}
.message.ai-message {
  align-self: flex-start;
}

.msg-avatar {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}
.user-avatar-bubble {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--bg-hover);
  border: 1px solid var(--border-active);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}
.msg-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: calc(100% - 50px);
}
.msg-sender {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.user-message .msg-sender { text-align: right; color: var(--text-muted); }
.msg-bubble {
  padding: 14px 18px;
  border-radius: 16px;
  font-size: 14px;
  line-height: 1.7;
  word-break: break-word;
}
.ai-message .msg-bubble {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  border-radius: 4px 16px 16px 16px;
}
.user-message .msg-bubble {
  background: var(--persona-gradient);
  color: #fff;
  border-radius: 16px 4px 16px 16px;
  box-shadow: 0 4px 12px var(--persona-glow);
}
.msg-time {
  font-size: 10px;
  color: var(--text-muted);
}
.user-message .msg-time { text-align: right; }

/* Message text formatting */
.msg-bubble strong { font-weight: 700; }
.msg-bubble em { font-style: italic; }
.msg-bubble p { margin: 0 0 8px; }
.msg-bubble p:last-child { margin-bottom: 0; }
.msg-bubble ul, .msg-bubble ol { padding-left: 20px; margin: 6px 0; }
.msg-bubble li { margin: 4px 0; }
.msg-bubble code {
  background: rgba(255,255,255,0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
}

/* ===== TYPING INDICATOR ===== */
.typing-indicator {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 0 24px 12px;
  animation: fadeIn 0.2s ease;
}
.typing-indicator.visible { display: flex; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.typing-avatar {
  width: 36px; height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}
.typing-bubble {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 12px 16px;
}
.typing-bubble .dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--persona-primary);
  animation: bounce-dot 1.2s infinite ease-in-out;
}
.typing-bubble .dot:nth-child(1) { animation-delay: 0s; }
.typing-bubble .dot:nth-child(2) { animation-delay: 0.2s; }
.typing-bubble .dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes bounce-dot {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.5; }
  40% { transform: translateY(-6px); opacity: 1; }
}
.typing-text {
  font-size: 12px;
  color: var(--text-muted);
  font-style: italic;
}

/* ===== ERROR BANNER ===== */
.error-banner {
  display: none;
  align-items: center;
  gap: 10px;
  margin: 0 24px 12px;
  padding: 12px 16px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--border-radius-sm);
  font-size: 13px;
  color: #fca5a5;
  animation: fadeIn 0.2s ease;
}
.error-banner.visible { display: flex; }
.error-icon { font-size: 16px; }
.error-banner span:nth-child(2) { flex: 1; }
.error-close {
  background: none;
  border: none;
  color: #fca5a5;
  cursor: pointer;
  font-size: 14px;
  padding: 2px 6px;
  border-radius: 4px;
  transition: background var(--transition);
}
.error-close:hover { background: rgba(239, 68, 68, 0.2); }

/* ===== INPUT AREA ===== */
.input-area {
  padding: 16px 24px 20px;
  background: rgba(10, 11, 15, 0.8);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--border-subtle);
  flex-shrink: 0;
}
.input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--border-radius);
  padding: 12px 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.input-wrapper:focus-within {
  border-color: var(--persona-primary);
  box-shadow: 0 0 0 3px var(--persona-glow);
}

#message-input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 14px;
  font-family: 'Inter', sans-serif;
  line-height: 1.6;
  resize: none;
  max-height: 140px;
  overflow-y: auto;
}
#message-input::placeholder { color: var(--text-muted); }
#message-input::-webkit-scrollbar { width: 2px; }
#message-input::-webkit-scrollbar-thumb { background: var(--border-subtle); }

.send-btn {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--persona-gradient);
  border: none;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition);
  box-shadow: 0 2px 8px var(--persona-glow);
}
.send-btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px var(--persona-glow);
}
.send-btn:active:not(:disabled) { transform: translateY(0); }
.send-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  box-shadow: none;
}

.input-hint {
  font-size: 10px;
  color: var(--text-muted);
  text-align: center;
  margin-top: 8px;
}

/* ===== OVERLAY ===== */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 90;
  backdrop-filter: blur(2px);
}
.sidebar-overlay.visible { display: block; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    transform: translateX(-100%);
    z-index: 100;
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 40px rgba(0,0,0,0.5);
  }
  .sidebar-toggle { display: flex; }
  .chat-area { width: 100%; }
  .chat-header { padding: 12px 16px 12px 60px; }
  .messages-container { padding: 16px; }
  .input-area { padding: 12px 16px 16px; }
  .welcome-screen { padding: 24px 12px; }
  .welcome-title { font-size: 20px; }
  .online-badge { display: none; }
  .chips-grid { gap: 6px; }
  .chip { font-size: 12px; padding: 7px 12px; }
  .message { max-width: 100%; }
}

@media (max-width: 480px) {
  .header-name { font-size: 14px; }
  .header-role { display: none; }
  .clear-btn span { display: none; }
}

/* ===== ANIMATIONS ===== */
@keyframes shimmer {
  0% { background-position: -200% center; }
  100% { background-position: 200% center; }
}

.persona-btn.active::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  border-radius: 0 2px 2px 0;
  background: var(--persona-gradient);
}