/* Nimbus AI Chat Widget — CG-1310 Phase 4
   Dual-theme: marketing (glassmorphism) + dashboard (solid depth)
   Brand tokens: IBM Plex Sans, Inter, 8px grid, Coral/Grape accents
*/

/* ================================================================
   CSS Custom Properties (shared tokens)
   ================================================================ */
:root {
  --nimbus-font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --nimbus-font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --nimbus-radius-panel: 12px;
  --nimbus-radius-bubble: 8px;
  --nimbus-radius-input: 6px;
  --nimbus-radius-btn: 8px;
  --nimbus-transition: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --nimbus-coral: #F89389;
  --nimbus-grape: #5915B9;
  --nimbus-grape-light: #775FEC;
  --nimbus-error: #E5484D;
  --nimbus-white: #FFFFFF;
  --nimbus-z-fab: 9998;
  --nimbus-z-panel: 9999;
}


/* ================================================================
   FAB (Floating Action Button)
   ================================================================ */
.nimbus-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--nimbus-z-fab);
  transition: transform var(--nimbus-transition), box-shadow var(--nimbus-transition);
  color: var(--nimbus-white);
}

.nimbus-fab:hover {
  transform: scale(1.08);
}

.nimbus-fab:focus-visible {
  outline: 2px solid var(--nimbus-coral);
  outline-offset: 3px;
}

.nimbus-fab-icon--close {
  display: none;
}

.nimbus-fab.is-open .nimbus-fab-icon--chat {
  display: none;
}

.nimbus-fab.is-open .nimbus-fab-icon--close {
  display: block;
}

.nimbus-fab-pulse {
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  animation: nimbus-pulse 2s ease-in-out infinite;
  pointer-events: none;
}

@keyframes nimbus-pulse {
  0%, 100% { transform: scale(1); opacity: 0.4; }
  50% { transform: scale(1.15); opacity: 0; }
}


/* ================================================================
   Chat Panel
   ================================================================ */
.nimbus-chat-panel {
  position: fixed;
  bottom: 96px;
  right: 24px;
  width: 380px;
  max-height: calc(100vh - 120px);
  min-height: 420px;
  display: flex;
  flex-direction: column;
  font-family: var(--nimbus-font-sans);
  font-size: 14px;
  line-height: 1.5;
  z-index: var(--nimbus-z-panel);
  border-radius: var(--nimbus-radius-panel);
  overflow: hidden;
  transform: translateY(16px) scale(0.95);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--nimbus-transition), opacity var(--nimbus-transition);
}

.nimbus-chat-panel.is-open {
  transform: translateY(0) scale(1);
  opacity: 1;
  pointer-events: auto;
}


/* ================================================================
   Header
   ================================================================ */
.nimbus-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
}

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

.nimbus-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--nimbus-font-heading);
  font-weight: 600;
  font-size: 16px;
  color: var(--nimbus-white);
  background: linear-gradient(135deg, var(--nimbus-grape), var(--nimbus-grape-light));
  flex-shrink: 0;
}

.nimbus-header-title {
  display: block;
  font-family: var(--nimbus-font-heading);
  font-weight: 600;
  font-size: 15px;
  color: var(--nimbus-white);
}

.nimbus-header-subtitle {
  display: block;
  font-size: 12px;
  opacity: 0.7;
}

.nimbus-close-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  color: inherit;
  opacity: 0.6;
  transition: opacity var(--nimbus-transition);
}

.nimbus-close-btn:hover {
  opacity: 1;
}

.nimbus-close-btn:focus-visible {
  outline: 2px solid var(--nimbus-coral);
  outline-offset: 2px;
}


/* ================================================================
   Messages Area
   ================================================================ */
.nimbus-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
}

.nimbus-messages::-webkit-scrollbar {
  width: 4px;
}

.nimbus-messages::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 2px;
}

/* Message bubbles */
.nimbus-msg {
  max-width: 85%;
  padding: 10px 14px;
  border-radius: var(--nimbus-radius-bubble);
  word-wrap: break-word;
  overflow-wrap: break-word;
  animation: nimbus-msg-in 200ms ease-out;
}

@keyframes nimbus-msg-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.nimbus-msg--user {
  align-self: flex-end;
}

.nimbus-msg--bot {
  align-self: flex-start;
}
.nimbus-msg--bot p { margin: 0 0 8px 0; }
.nimbus-msg--bot p:last-child { margin-bottom: 0; }
.nimbus-msg--bot ul { margin: 4px 0 8px 16px; padding: 0; }
.nimbus-msg--bot li { margin-bottom: 2px; }

/* Welcome message */
.nimbus-welcome {
  align-self: flex-start;
  padding: 10px 14px;
  border-radius: var(--nimbus-radius-bubble);
  font-size: 14px;
}

/* Suggestion chips */
.nimbus-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  align-self: flex-start;
}

.nimbus-chip {
  padding: 6px 14px;
  border-radius: 9999px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.05);
  color: inherit;
  font-family: var(--nimbus-font-sans);
  font-size: 13px;
  cursor: pointer;
  transition: background var(--nimbus-transition), border-color var(--nimbus-transition);
  white-space: nowrap;
}

.nimbus-chip:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
}

.nimbus-chip:focus-visible {
  outline: 2px solid var(--nimbus-coral);
  outline-offset: 2px;
}

/* Escalation card */
.nimbus-escalation-card {
  align-self: flex-start;
  padding: 12px 16px;
  border-radius: var(--nimbus-radius-bubble);
  border-left: 3px solid var(--nimbus-coral);
  font-size: 13px;
  background: rgba(248, 147, 137, 0.08);
}

.nimbus-escalation-card strong {
  display: block;
  margin-bottom: 4px;
  color: var(--nimbus-coral);
}


/* ================================================================
   Typing Indicator
   ================================================================ */
.nimbus-typing {
  display: none;
  padding: 0 16px 8px;
  gap: 4px;
  align-items: center;
}

.nimbus-typing[aria-hidden="false"] {
  display: flex;
}

.nimbus-typing-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  animation: nimbus-dot-bounce 1.2s ease-in-out infinite;
}

.nimbus-typing-dot:nth-child(2) { animation-delay: 0.15s; }
.nimbus-typing-dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes nimbus-dot-bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-4px); opacity: 1; }
}


/* ================================================================
   Identity Capture Card
   ================================================================ */
.nimbus-identity-card {
  display: none;
  padding: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
}

.nimbus-identity-card[aria-hidden="false"] {
  display: block;
}

.nimbus-identity-message {
  font-size: 13px;
  margin: 0 0 12px;
  opacity: 0.9;
  line-height: 1.5;
}

.nimbus-identity-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nimbus-input {
  width: 100%;
  padding: 8px 12px;
  border-radius: var(--nimbus-radius-input);
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.05);
  color: inherit;
  font-family: var(--nimbus-font-sans);
  font-size: 13px;
  transition: border-color var(--nimbus-transition);
  box-sizing: border-box;
}

.nimbus-input:focus {
  outline: none;
  border-color: var(--nimbus-coral);
}

.nimbus-input::placeholder {
  opacity: 0.5;
}

.nimbus-privacy-notice {
  font-size: 11px;
  opacity: 0.6;
  margin: 0;
  line-height: 1.4;
}

.nimbus-privacy-notice a {
  color: var(--nimbus-coral);
  text-decoration: underline;
}

.nimbus-identity-actions {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.nimbus-btn {
  padding: 8px 16px;
  border-radius: var(--nimbus-radius-btn);
  border: none;
  font-family: var(--nimbus-font-sans);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity var(--nimbus-transition), transform var(--nimbus-transition);
}

.nimbus-btn:hover {
  opacity: 0.9;
}

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

.nimbus-btn:focus-visible {
  outline: 2px solid var(--nimbus-coral);
  outline-offset: 2px;
}

.nimbus-btn--primary {
  background: var(--nimbus-coral);
  color: #1a1a2e;
}

.nimbus-btn--dismiss {
  background: transparent;
  color: inherit;
  opacity: 0.6;
  border: 1px solid rgba(255, 255, 255, 0.15);
}


/* ================================================================
   Input Area
   ================================================================ */
.nimbus-input-area {
  padding: 12px 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
}

.nimbus-input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 8px;
}

.nimbus-textarea {
  flex: 1;
  resize: none;
  padding: 8px 12px;
  border-radius: var(--nimbus-radius-input);
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.05);
  color: inherit;
  font-family: var(--nimbus-font-sans);
  font-size: 14px;
  line-height: 1.5;
  max-height: 120px;
  overflow-y: auto;
  transition: border-color var(--nimbus-transition);
  box-sizing: border-box;
}

.nimbus-textarea:focus {
  outline: none;
  border-color: var(--nimbus-coral);
}

.nimbus-textarea::placeholder {
  opacity: 0.5;
}

.nimbus-textarea:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.nimbus-send-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--nimbus-radius-btn);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: opacity var(--nimbus-transition), transform var(--nimbus-transition);
  color: var(--nimbus-white);
}

.nimbus-send-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.nimbus-send-btn:not(:disabled):hover {
  transform: scale(1.05);
}

.nimbus-send-btn:focus-visible {
  outline: 2px solid var(--nimbus-coral);
  outline-offset: 2px;
}

.nimbus-branding {
  display: block;
  text-align: center;
  font-size: 10px;
  opacity: 0.35;
  margin-top: 8px;
}


/* ================================================================
   THEME: Marketing (glassmorphism, coral accents)
   ================================================================ */
.nimbus-theme-marketing .nimbus-fab {
  background: var(--nimbus-coral);
  box-shadow: 0 4px 16px rgba(248, 147, 137, 0.4);
}

.nimbus-theme-marketing .nimbus-fab-pulse {
  background: var(--nimbus-coral);
}

.nimbus-theme-marketing .nimbus-chat-panel {
  background: rgba(44, 15, 91, 0.35);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(89, 21, 185, 0.15);
  color: #D1CDD9;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.nimbus-theme-marketing .nimbus-header-subtitle {
  color: #D1CDD9;
}

.nimbus-theme-marketing .nimbus-msg--user {
  background: rgba(248, 147, 137, 0.15);
  color: #D1CDD9;
}

.nimbus-theme-marketing .nimbus-msg--bot,
.nimbus-theme-marketing .nimbus-welcome {
  background: rgba(255, 255, 255, 0.05);
  color: #D1CDD9;
}

.nimbus-theme-marketing .nimbus-send-btn {
  background: var(--nimbus-coral);
  border-radius: 9999px;
}

.nimbus-theme-marketing .nimbus-typing-dot {
  background: rgba(209, 205, 217, 0.5);
}


/* ================================================================
   THEME: Dashboard (solid depth, grape/periwinkle accents)
   ================================================================ */
.nimbus-theme-dashboard .nimbus-fab {
  background: linear-gradient(135deg, var(--nimbus-grape), var(--nimbus-grape-light));
  box-shadow: 0 4px 16px rgba(89, 21, 185, 0.4);
}

.nimbus-theme-dashboard .nimbus-fab-pulse {
  background: var(--nimbus-grape);
}

.nimbus-theme-dashboard .nimbus-chat-panel {
  background: #2C0F5B;
  border: 1px solid rgba(89, 21, 185, 0.25);
  color: #B8BFFF;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.nimbus-theme-dashboard .nimbus-header-subtitle {
  color: #B8BFFF;
}

.nimbus-theme-dashboard .nimbus-msg--user {
  background: rgba(89, 21, 185, 0.35);
  color: #B8BFFF;
}

.nimbus-theme-dashboard .nimbus-msg--bot,
.nimbus-theme-dashboard .nimbus-welcome {
  background: rgba(255, 255, 255, 0.1);
  color: #B8BFFF;
}

.nimbus-theme-dashboard .nimbus-send-btn {
  background: linear-gradient(135deg, var(--nimbus-grape), var(--nimbus-grape-light));
}

.nimbus-theme-dashboard .nimbus-typing-dot {
  background: var(--nimbus-coral);
}

@keyframes nimbus-dot-bounce-coral {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-4px); opacity: 1; }
}

.nimbus-theme-dashboard .nimbus-typing-dot {
  animation-name: nimbus-dot-bounce-coral;
}

.nimbus-theme-dashboard .nimbus-btn--primary {
  background: linear-gradient(135deg, var(--nimbus-grape), var(--nimbus-grape-light));
  color: var(--nimbus-white);
}


/* ================================================================
   Mobile Responsive — full-screen below 640px
   ================================================================ */
@media (max-width: 640px) {
  .nimbus-fab {
    bottom: 16px;
    right: 16px;
    width: 48px;
    height: 48px;
  }

  .nimbus-chat-panel {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100vh;
    height: 100dvh;        /* dynamic viewport — shrinks when keyboard opens */
    max-height: none;
    min-height: 0;
    border-radius: 0;
    bottom: 0;
    right: 0;
  }

  .nimbus-chat-panel.is-open {
    transform: translateY(0) scale(1);
  }

  .nimbus-fab.is-open {
    display: none;
  }
}


/* ================================================================
   Approaching limit / disabled states
   ================================================================ */
.nimbus-limit-warning {
  padding: 10px 14px;
  border-radius: var(--nimbus-radius-bubble);
  background: rgba(248, 147, 137, 0.1);
  border: 1px solid rgba(248, 147, 137, 0.2);
  font-size: 13px;
  align-self: center;
  text-align: center;
}

.nimbus-input-disabled-msg {
  text-align: center;
  font-size: 12px;
  opacity: 0.6;
  padding: 8px 0;
}


/* ================================================================
   Reduced Motion
   ================================================================ */
@media (prefers-reduced-motion: reduce) {
  .nimbus-chat-panel,
  .nimbus-fab,
  .nimbus-msg,
  .nimbus-btn,
  .nimbus-send-btn,
  .nimbus-input,
  .nimbus-textarea {
    transition: none;
  }

  .nimbus-fab-pulse,
  .nimbus-typing-dot {
    animation: none;
  }

  .nimbus-msg {
    animation: none;
  }
}