/* ==========================================================================
   Shart AI Chat Widget — Sprint 2
   Matches Shart brand identity: #21708f color family, RTL, Mobile-First
   ========================================================================== */

/* --------------------------------------------------
   CSS Variables (aligned with design-tokens.css)
-------------------------------------------------- */
:root {
  --ai-primary:       #21708f;
  --ai-primary-dark:  #163D4D;
  --ai-primary-light: #e9f1f4;
  --ai-primary-mid:   #377e9a;
  --ai-white:         #ffffff;
  --ai-text:          #0D2A35;
  --ai-text-muted:    #3A6478;
  --ai-border:        #bcd4dd;
  --ai-surface:       #f4f9fb;
  --ai-error:         #EF4444;
  --ai-error-bg:      #FEF2F2;
  --ai-shadow:        0 8px 40px rgba(13, 42, 53, 0.18);
  --ai-radius-panel:  16px;
  --ai-radius-bubble: 14px;
  --ai-z-widget:      9999;
  --ai-panel-w:       360px;
  --ai-panel-h:       520px;
  --ai-btn-size:      58px;
  --ai-font:          'IBM Plex Sans Arabic', sans-serif;
  --ai-transition:    0.28s cubic-bezier(0.34, 1.2, 0.64, 1);
}

/* --------------------------------------------------
   Widget Root Container (Right side of screen, opposite WhatsApp on Left)
-------------------------------------------------- */
.shart-ai-widget {
  position: fixed;
  bottom: 28px;
  right: 28px;
  left: auto;
  z-index: var(--ai-z-widget);
  font-family: var(--ai-font);
  direction: rtl;
  text-align: right;
}

/* Ensure right side in RTL mode */
[dir="rtl"] .shart-ai-widget {
  right: 28px;
  left: auto;
}

/* --------------------------------------------------
   Floating Trigger Button
-------------------------------------------------- */
.shart-ai-trigger {
  position: relative;
  width: var(--ai-btn-size);
  height: var(--ai-btn-size);
  border-radius: 50%;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, var(--ai-primary) 0%, var(--ai-primary-dark) 100%);
  color: var(--ai-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(33, 112, 143, 0.45);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  outline: none;
}

.shart-ai-trigger:hover {
  transform: scale(1.08);
  box-shadow: 0 6px 28px rgba(33, 112, 143, 0.60);
}

.shart-ai-trigger:focus-visible {
  outline: 3px solid var(--ai-primary-light);
  outline-offset: 3px;
}

.shart-ai-trigger:active {
  transform: scale(0.96);
}

/* Pulse Ring */
.shart-ai-pulse {
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px solid rgba(33, 112, 143, 0.5);
  animation: shartAiPulse 2.5s ease-out infinite;
  pointer-events: none;
}

@keyframes shartAiPulse {
  0%   { transform: scale(1);    opacity: 0.8; }
  70%  { transform: scale(1.5);  opacity: 0;   }
  100% { transform: scale(1.5);  opacity: 0;   }
}

/* Icon States */
.shart-ai-trigger-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  transition: opacity 0.2s ease, transform 0.25s var(--ai-transition);
}

.shart-ai-icon-close {
  opacity: 0;
  transform: rotate(-90deg) scale(0.6);
}

.shart-ai-icon-open {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* When panel is open — swap icons */
.shart-ai-widget.is-open .shart-ai-icon-open {
  opacity: 0;
  transform: rotate(90deg) scale(0.6);
}

.shart-ai-widget.is-open .shart-ai-icon-close {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

/* Pulse stops when open */
.shart-ai-widget.is-open .shart-ai-pulse {
  animation: none;
  opacity: 0;
}

/* Sparkle Badge on AI Trigger */
.shart-ai-badge-sparkle {
  position: absolute;
  top: -4px;
  right: -4px;
  background: linear-gradient(135deg, #F59E0B, #FBBF24);
  color: #0D2A35;
  font-size: 10px;
  font-weight: 800;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.6);
  border: 1.5px solid var(--ai-white);
  animation: shartAiSparkleFloat 2s ease-in-out infinite alternate;
}

@keyframes shartAiSparkleFloat {
  0% { transform: translateY(0) scale(1); }
  100% { transform: translateY(-3px) scale(1.15); filter: drop-shadow(0 0 6px rgba(251, 191, 36, 0.8)); }
}

.shart-ai-modern-icon {
  filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.2));
}

/* Tooltip */
.shart-ai-trigger-tooltip {
  position: absolute;
  bottom: 115%;
  right: 0;
  background: var(--ai-primary-dark);
  color: var(--ai-white);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 10px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transform: translateY(4px);
  transition: all 0.22s ease;
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--ai-font);
  box-shadow: 0 4px 16px rgba(13, 42, 53, 0.25);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.shart-ai-trigger-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  right: 20px;
  border: 5px solid transparent;
  border-top-color: var(--ai-primary-dark);
}

.shart-ai-trigger:hover .shart-ai-trigger-tooltip,
.shart-ai-trigger:focus .shart-ai-trigger-tooltip {
  opacity: 1;
  transform: translateY(0);
}

/* Hide tooltip when panel is open */
.shart-ai-widget.is-open .shart-ai-trigger-tooltip {
  display: none;
}

.shart-ai-online-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10B981;
  display: inline-block;
  flex-shrink: 0;
  animation: shartAiOnlinePulse 2s ease infinite;
}

@keyframes shartAiOnlinePulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

/* --------------------------------------------------
   Chat Panel (Anchored to Right Corner)
-------------------------------------------------- */
.shart-ai-panel {
  position: absolute;
  bottom: calc(var(--ai-btn-size) + 14px);
  right: 0;
  left: auto;
  width: var(--ai-panel-w);
  max-height: var(--ai-panel-h);
  background: var(--ai-white);
  border-radius: var(--ai-radius-panel);
  box-shadow: var(--ai-shadow);
  display: flex;
  flex-direction: column;
  overflow: hidden;

  /* Hidden state */
  opacity: 0;
  transform: translateY(20px) scale(0.95);
  pointer-events: none;
  transform-origin: bottom right;
  transition:
    opacity var(--ai-transition),
    transform var(--ai-transition);
}

.shart-ai-widget.is-open .shart-ai-panel {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}

/* --------------------------------------------------
   Panel Header
-------------------------------------------------- */
.shart-ai-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 16px;
  background: linear-gradient(135deg, var(--ai-primary) 0%, var(--ai-primary-dark) 100%);
  color: var(--ai-white);
  flex-shrink: 0;
}

.shart-ai-header-avatar {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255,255,255,0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.shart-ai-header-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.shart-ai-header-name {
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.shart-ai-header-status {
  font-size: 0.72rem;
  opacity: 0.85;
  display: flex;
  align-items: center;
  gap: 5px;
}

.shart-ai-status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10B981;
  display: inline-block;
  animation: shartAiOnlinePulse 2s ease infinite;
}

.shart-ai-close-btn {
  background: rgba(255,255,255,0.15);
  border: none;
  border-radius: 50%;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--ai-white);
  transition: background 0.2s;
  flex-shrink: 0;
}

.shart-ai-close-btn:hover {
  background: rgba(255,255,255,0.28);
}

.shart-ai-close-btn:focus-visible {
  outline: 2px solid rgba(255,255,255,0.8);
  outline-offset: 2px;
}

/* --------------------------------------------------
   Messages Area
-------------------------------------------------- */
.shart-ai-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
  overscroll-behavior: contain;
  -webkit-overflow-scrolling: touch;
}

/* Custom scrollbar */
.shart-ai-messages::-webkit-scrollbar { width: 4px; }
.shart-ai-messages::-webkit-scrollbar-track { background: transparent; }
.shart-ai-messages::-webkit-scrollbar-thumb {
  background: var(--ai-border);
  border-radius: 4px;
}

/* --------------------------------------------------
   Message Bubbles
-------------------------------------------------- */
.shart-ai-msg {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  max-width: 92%;
  animation: shartAiMsgIn 0.25s ease-out;
}

@keyframes shartAiMsgIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* Bot messages — align right (RTL) */
.shart-ai-msg--bot {
  align-self: flex-start;
  flex-direction: row;
}

/* User messages — align left (RTL) */
.shart-ai-msg--user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.shart-ai-msg-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--ai-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--ai-primary);
}

.shart-ai-msg-bubble {
  padding: 10px 13px;
  border-radius: var(--ai-radius-bubble);
  font-size: 0.84rem;
  line-height: 1.6;
  max-width: 100%;
  word-break: break-word;
  overflow-wrap: break-word;
}

/* Bot bubble */
.shart-ai-msg--bot .shart-ai-msg-bubble {
  background: var(--ai-surface);
  color: var(--ai-text);
  border-radius: var(--ai-radius-bubble) var(--ai-radius-bubble) var(--ai-radius-bubble) 4px;
}

/* User bubble */
.shart-ai-msg--user .shart-ai-msg-bubble {
  background: linear-gradient(135deg, var(--ai-primary) 0%, var(--ai-primary-dark) 100%);
  color: var(--ai-white);
  border-radius: var(--ai-radius-bubble) var(--ai-radius-bubble) 4px var(--ai-radius-bubble);
}

/* Markdown-like formatting in bot bubbles */
.shart-ai-msg--bot .shart-ai-msg-bubble p {
  margin: 0 0 6px 0;
}
.shart-ai-msg--bot .shart-ai-msg-bubble p:last-child {
  margin-bottom: 0;
}
.shart-ai-msg--bot .shart-ai-msg-bubble strong {
  color: var(--ai-primary);
  font-weight: 600;
}
.shart-ai-msg--bot .shart-ai-msg-bubble ul,
.shart-ai-msg--bot .shart-ai-msg-bubble ol {
  padding-right: 18px;
  padding-left: 0;
  margin: 6px 0;
}
.shart-ai-msg--bot .shart-ai-msg-bubble li {
  margin-bottom: 3px;
}

/* --------------------------------------------------
   Typing Indicator
-------------------------------------------------- */
.shart-ai-loading {
  padding: 0 14px 4px;
  flex-shrink: 0;
}

.shart-ai-loading[hidden] {
  display: none;
}

.shart-ai-typing {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 10px 14px !important;
}

.shart-ai-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ai-primary-mid);
  animation: shartAiTyping 1.2s ease infinite;
  flex-shrink: 0;
}

.shart-ai-dot:nth-child(2) { animation-delay: 0.2s; }
.shart-ai-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes shartAiTyping {
  0%, 60%, 100% { transform: translateY(0);    opacity: 0.4; }
  30%            { transform: translateY(-5px); opacity: 1;   }
}

/* --------------------------------------------------
   Error Banner
-------------------------------------------------- */
.shart-ai-error {
  margin: 0 14px 8px;
  padding: 8px 12px;
  background: var(--ai-error-bg);
  border: 1px solid #FECACA;
  border-radius: 8px;
  color: var(--ai-error);
  font-size: 0.78rem;
  display: flex;
  align-items: center;
  gap: 7px;
  animation: shartAiMsgIn 0.2s ease-out;
  flex-shrink: 0;
}

.shart-ai-error[hidden] {
  display: none;
}

/* --------------------------------------------------
   Input Area
-------------------------------------------------- */
.shart-ai-input-area {
  border-top: 1px solid var(--ai-border);
  padding: 12px 14px 10px;
  flex-shrink: 0;
  background: var(--ai-white);
}

.shart-ai-form {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.shart-ai-input-wrap {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--ai-surface);
  border: 1.5px solid var(--ai-border);
  border-radius: 12px;
  padding: 8px 10px;
  transition: border-color 0.2s;
}

.shart-ai-input-wrap:focus-within {
  border-color: var(--ai-primary);
  background: #fff;
}

.shart-ai-input {
  flex: 1;
  border: none;
  background: transparent;
  resize: none;
  font-family: var(--ai-font);
  font-size: 0.84rem;
  color: var(--ai-text);
  line-height: 1.5;
  outline: none;
  min-height: 22px;
  max-height: 100px;
  overflow-y: auto;
  direction: auto;
}

.shart-ai-input::placeholder {
  color: var(--ai-text-muted);
  opacity: 0.7;
}

/* Hide scrollbar in textarea */
.shart-ai-input::-webkit-scrollbar { width: 3px; }
.shart-ai-input::-webkit-scrollbar-thumb { background: var(--ai-border); }

.shart-ai-send {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  border: none;
  background: var(--ai-primary);
  color: var(--ai-white);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.2s, transform 0.15s, opacity 0.2s;
  transform: rotate(180deg); /* Send icon points left in RTL */
}

[dir="rtl"] .shart-ai-send {
  transform: rotate(180deg);
}

.shart-ai-send:hover:not(:disabled) {
  background: var(--ai-primary-dark);
  transform: rotate(180deg) scale(1.08);
}

.shart-ai-send:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.shart-ai-send:focus-visible {
  outline: 2px solid var(--ai-primary);
  outline-offset: 2px;
}

/* Disclaimer */
.shart-ai-disclaimer {
  font-size: 0.7rem;
  color: var(--ai-text-muted);
  text-align: center;
  margin: 8px 0 0;
  line-height: 1.4;
}

.shart-ai-disclaimer-link {
  color: var(--ai-primary);
  text-decoration: none;
  font-weight: 500;
}

.shart-ai-disclaimer-link:hover {
  text-decoration: underline;
}

/* --------------------------------------------------
   Mobile Responsive (<= 480px)
-------------------------------------------------- */
@media (max-width: 480px) {
  :root {
    --ai-panel-w:  100vw;
    --ai-panel-h:  100svh;  /* full screen on mobile */
    --ai-btn-size: 52px;
  }

  .shart-ai-widget {
    bottom: 16px;
    right: 16px;
    left: auto;
  }

  .shart-ai-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-width: 100%;
    height: 100svh;
    max-height: 100svh;
    border-radius: 0;
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
    transform-origin: bottom center;
  }

  /* Slide up on mobile */
  .shart-ai-panel {
    transform: translateY(100%);
    opacity: 1;
    transition: transform 0.32s cubic-bezier(0.34, 1.1, 0.64, 1);
  }

  .shart-ai-widget.is-open .shart-ai-panel {
    transform: translateY(0);
    opacity: 1;
  }

  /* Prevent body scroll when chat is open on mobile */
  body.shart-ai-panel-open {
    overflow: hidden;
  }
}

/* --------------------------------------------------
   Small tablets (481px–768px) — compact panel
-------------------------------------------------- */
@media (min-width: 481px) and (max-width: 768px) {
  :root {
    --ai-panel-w: 320px;
    --ai-panel-h: 480px;
  }
}

/* --------------------------------------------------
   High contrast / reduced motion
-------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .shart-ai-pulse,
  .shart-ai-dot,
  .shart-ai-online-dot,
  .shart-ai-status-dot {
    animation: none;
  }

  .shart-ai-panel,
  .shart-ai-trigger,
  .shart-ai-trigger-icon {
    transition: none;
  }
}