/* =========================================================
   XEN A.I — Front-end Chat Widget Styles
   ========================================================= */

/* ── Root variables (overridden at runtime via JS) ─────── */
#xen-ai-widget {
  --xen-accent:       #4f46e5;
  --xen-accent-dark:  #4338ca;
  --xen-accent-rgb:   79, 70, 229;
  --xen-user-bubble:  #4f46e5;
  --xen-bot-bubble:   #f1f5f9;
  --xen-bot-text:     #1e293b;
  --xen-header-bg:    linear-gradient(135deg, #4f46e5, #7c3aed);
  --xen-win-radius:   18px;
  --xen-win-w:        360px;
  --xen-win-h:        520px;

  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2147483640;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: #1e293b;
}

/* ── Toggle button ──────────────────────────────────────── */
.xen-ai-toggle {
  width: 58px;
  height: 58px;
  border-radius: 50%;
  background: var(--xen-accent);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 24px rgba(var(--xen-accent-rgb), .45);
  transition: transform .2s ease, box-shadow .2s ease;
  position: relative;
  outline: none;
  animation: xen-pulse-btn 3s ease-in-out infinite;
}
.xen-ai-toggle:hover { transform: scale(1.08); }
.xen-ai-toggle:focus-visible {
  outline: 3px solid rgba(var(--xen-accent-rgb), .4);
  outline-offset: 3px;
}
.xen-ai-toggle svg { fill: #fff; display: block; }
.xen-toggle-logo { width: 26px; height: 26px; border-radius: 50%; object-fit: cover; display: block; }

@keyframes xen-pulse-btn {
  0%, 100% { box-shadow: 0 4px 24px rgba(var(--xen-accent-rgb), .45); }
  50%       { box-shadow: 0 4px 32px rgba(var(--xen-accent-rgb), .65), 0 0 0 10px rgba(var(--xen-accent-rgb), .08); }
}

/* ── Notification bubble ────────────────────────────────── */
.xen-ai-notification {
  position: absolute;
  bottom: 70px;
  right: 0;
  background: #fff;
  border-radius: 14px;
  padding: 10px 36px 10px 14px;
  box-shadow: 0 4px 20px rgba(0,0,0,.15);
  font-size: 0.85rem;
  white-space: nowrap;
  max-width: 240px;
  white-space: normal;
  display: none;
  animation: xen-slide-up .3s ease;
}
.xen-ai-notification::after {
  content: '';
  position: absolute;
  bottom: -7px;
  right: 22px;
  width: 14px;
  height: 14px;
  background: #fff;
  transform: rotate(45deg);
  box-shadow: 2px 2px 4px rgba(0,0,0,.06);
}
.xen-ai-notification-close {
  position: absolute;
  top: 6px;
  right: 8px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 0.75rem;
  color: #94a3b8;
  line-height: 1;
  padding: 2px;
}
.xen-ai-notification-close:hover { color: #64748b; }

/* ── Chat window ────────────────────────────────────────── */
.xen-ai-window {
  position: absolute;
  bottom: 72px;
  right: 0;
  width: var(--xen-win-w);
  height: var(--xen-win-h);
  background: #fff;
  border-radius: var(--xen-win-radius);
  box-shadow: 0 20px 60px rgba(0,0,0,.18), 0 4px 16px rgba(0,0,0,.08);
  display: none;
  flex-direction: column;
  overflow: hidden;
  transform-origin: bottom right;
}
.xen-ai-window.xen-open {
  display: flex;
  animation: xen-win-in .25s cubic-bezier(.34,1.56,.64,1) forwards;
}
.xen-ai-window.xen-closing {
  animation: xen-win-out .2s ease forwards;
}

@keyframes xen-win-in  { from { opacity:0; transform:scale(.85) translateY(20px); } to { opacity:1; transform:scale(1) translateY(0); } }
@keyframes xen-win-out { from { opacity:1; transform:scale(1) translateY(0); }       to { opacity:0; transform:scale(.85) translateY(20px); } }
@keyframes xen-slide-up { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:translateY(0); } }

/* Window header */
.xen-ai-win-header {
  background: var(--xen-header-bg);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.xen-ai-win-identity { display: flex; align-items: center; gap: 10px; }
.xen-ai-win-header-actions { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.xen-ai-win-avatar {
  width: 38px;
  height: 38px;
  background: rgba(255,255,255,.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
  overflow: hidden;
}
.xen-ai-win-avatar.xen-avatar-img { background: transparent; }
.xen-ai-win-avatar img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; display: block; }
.xen-ai-win-identity strong { display: block; color: #fff; font-size: 0.95rem; }
.xen-ai-win-status { display: flex; align-items: center; gap: 5px; color: rgba(255,255,255,.8); font-size: 0.72rem; }
.xen-ai-online-dot {
  width: 7px;
  height: 7px;
  background: #4ade80;
  border-radius: 50%;
  animation: xen-blink 2s ease-in-out infinite;
}
@keyframes xen-blink { 0%,100%{opacity:1} 50%{opacity:.4} }

.xen-ai-win-close {
  background: rgba(255,255,255,.15);
  border: none;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  cursor: pointer;
  color: #fff;
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background .15s;
}
.xen-ai-win-close:hover { background: rgba(255,255,255,.3); }

/* Messages area */
.xen-ai-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
}
.xen-ai-messages::-webkit-scrollbar       { width: 4px; }
.xen-ai-messages::-webkit-scrollbar-track { background: transparent; }
.xen-ai-messages::-webkit-scrollbar-thumb { background: #e2e8f0; border-radius: 4px; }

/* Message bubbles */
.xen-ai-message {
  display: flex;
  gap: 8px;
  max-width: 88%;
  animation: xen-msg-in .2s ease;
}
@keyframes xen-msg-in { from { opacity:0; transform:translateY(6px); } to { opacity:1; transform:translateY(0); } }

.xen-ai-message.user {
  align-self: flex-end;
  flex-direction: row-reverse;
}
.xen-ai-message.assistant { align-self: flex-start; }

.xen-ai-msg-avatar {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--xen-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  flex-shrink: 0;
  margin-top: 2px;
  overflow: hidden;
}
.xen-ai-msg-avatar.xen-avatar-img { background: transparent; }
.xen-ai-msg-avatar img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; display: block; }

.xen-ai-msg-bubble {
  padding: 10px 14px;
  border-radius: 16px;
  font-size: 0.875rem;
  line-height: 1.55;
  word-break: break-word;
  white-space: pre-wrap;
}
.xen-ai-message.user      .xen-ai-msg-bubble { background: var(--xen-user-bubble); color: #fff; border-bottom-right-radius: 4px; }
.xen-ai-message.assistant .xen-ai-msg-bubble { background: var(--xen-bot-bubble);  color: var(--xen-bot-text); border-bottom-left-radius: 4px; }

/* Typing indicator */
.xen-ai-typing {
  display: none;
  padding: 0 16px 12px;
  flex-shrink: 0;
}
.xen-ai-typing-inner {
  background: var(--xen-bot-bubble);
  border-radius: 16px;
  border-bottom-left-radius: 4px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 10px 14px;
}
.xen-ai-typing-inner span {
  width: 7px;
  height: 7px;
  background: #94a3b8;
  border-radius: 50%;
  animation: xen-dot-bounce 1.2s ease-in-out infinite;
}
.xen-ai-typing-inner span:nth-child(2) { animation-delay: .2s; }
.xen-ai-typing-inner span:nth-child(3) { animation-delay: .4s; }
@keyframes xen-dot-bounce { 0%,80%,100%{transform:scale(1)} 40%{transform:scale(1.4)} }

/* ── Pro: Topic quick-menu chips ────────────────────────── */
.xen-ai-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 8px 12px 6px;
  border-top: 1px solid #f1f5f9;
  background: #fafbff;
  flex-shrink: 0;
}
.xen-ai-topics-label {
  width: 100%;
  font-size: 0.7rem;
  font-weight: 600;
  color: #94a3b8;
  text-transform: uppercase;
  letter-spacing: .06em;
  margin-bottom: 2px;
}
.xen-ai-topic-chip {
  background: rgba(var(--xen-accent-rgb), .08);
  color: var(--xen-accent);
  border: 1px solid rgba(var(--xen-accent-rgb), .2);
  border-radius: 20px;
  padding: 4px 12px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  transition: background .15s, transform .1s;
  white-space: nowrap;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
}
.xen-ai-topic-chip:hover {
  background: rgba(var(--xen-accent-rgb), .16);
  transform: translateY(-1px);
}

/* ── Pro: KB topic panel ────────────────────────────────── */

/* Toggle button in header */
.xen-ai-kb-toggle {
  background: rgba(255,255,255,.15);
  border: none;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  cursor: pointer;
  display: none; /* shown via JS when Pro active */
  align-items: center;
  justify-content: center;
  transition: background .15s, transform .15s;
  flex-shrink: 0;
  outline: none;
}
.xen-ai-kb-toggle:hover,
.xen-ai-kb-toggle-active { background: rgba(255,255,255,.35); }
.xen-ai-kb-toggle:focus-visible { outline: 2px solid rgba(255,255,255,.6); }
.xen-ai-kb-toggle svg { fill: #fff; display: block; }

@keyframes xen-kb-pulse {
  0%, 100% { transform: scale(1); }
  45%       { transform: scale(1.3); }
}
.xen-ai-kb-toggle-pulse { animation: xen-kb-pulse .45s ease 2; }

/* Panel */
.xen-ai-kb-panel {
  border-bottom: 1px solid #e8edf4;
  background: #f8faff;
  flex-shrink: 0;
  max-height: 210px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.xen-ai-kb-panel-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px 5px;
  flex-shrink: 0;
  border-bottom: 1px solid #edf1f7;
}
.xen-ai-kb-panel-title {
  font-size: 0.78rem;
  font-weight: 700;
  color: #475569;
  flex-shrink: 0;
}
.xen-ai-kb-panel-subtitle {
  font-size: 0.7rem;
  color: #94a3b8;
  margin-left: auto;
  font-style: italic;
  text-align: right;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 55%;
}
.xen-ai-kb-list {
  overflow-y: auto;
  padding: 4px 8px 6px;
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.xen-ai-kb-list::-webkit-scrollbar       { width: 3px; }
.xen-ai-kb-list::-webkit-scrollbar-track { background: transparent; }
.xen-ai-kb-list::-webkit-scrollbar-thumb { background: #e2e8f0; border-radius: 3px; }
.xen-ai-kb-item {
  background: none;
  border: none;
  border-radius: 7px;
  padding: 6px 10px;
  font-size: 0.82rem;
  font-family: inherit;
  color: #334155;
  cursor: pointer;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 7px;
  transition: background .12s, color .12s;
  width: 100%;
}
.xen-ai-kb-item::before {
  content: '›';
  color: var(--xen-accent);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1;
  flex-shrink: 0;
}
.xen-ai-kb-item:hover {
  background: rgba(var(--xen-accent-rgb), .08);
  color: var(--xen-accent);
}
.xen-ai-kb-empty {
  font-size: 0.8rem;
  color: #94a3b8;
  padding: 6px 10px;
  font-style: italic;
  margin: 0;
}

/* Input row */
.xen-ai-input-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid #f1f5f9;
  flex-shrink: 0;
}
.xen-ai-user-input {
  flex: 1;
  border: 1px solid #e2e8f0;
  border-radius: 12px;
  padding: 9px 12px;
  font-size: 0.875rem;
  resize: none;
  outline: none;
  font-family: inherit;
  transition: border-color .15s, box-shadow .15s;
  max-height: 100px;
  overflow-y: auto;
  line-height: 1.5;
}
.xen-ai-user-input:focus {
  border-color: var(--xen-accent);
  box-shadow: 0 0 0 3px rgba(var(--xen-accent-rgb), .1);
}
.xen-ai-send-btn {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: var(--xen-accent);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background .15s, transform .1s;
}
.xen-ai-send-btn:hover   { background: var(--xen-accent-dark); }
.xen-ai-send-btn:active  { transform: scale(.92); }
.xen-ai-send-btn:disabled { opacity: .5; cursor: not-allowed; }
.xen-ai-send-btn svg { fill: #fff; }

/* Window footer */
.xen-ai-win-footer {
  text-align: center;
  padding: 6px;
  font-size: 0.68rem;
  color: #94a3b8;
  border-top: 1px solid #f8fafc;
  flex-shrink: 0;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 420px) {
  #xen-ai-widget { bottom: 12px; right: 12px; }
  .xen-ai-window { width: calc(100vw - 24px); right: 0; }
}