/* ═══════════════════════════════════════════════════════════════
   VisionTact AI Assistant — Chatbot Widget Styles
   Professional, embeddable chat UI
   ═══════════════════════════════════════════════════════════════ */

/* ── CSS Custom Properties ──────────────────────────────────── */
:root {
  /* Brand colours */
  --vt-primary:       #2563eb;
  --vt-primary-dark:  #1d4ed8;
  --vt-primary-light: #eff6ff;
  --vt-accent:        #0ea5e9;

  /* Neutrals */
  --vt-white:         #ffffff;
  --vt-bg:            #f8fafc;
  --vt-border:        #e2e8f0;
  --vt-surface:       #ffffff;
  --vt-text-primary:  #0f172a;
  --vt-text-secondary:#64748b;
  --vt-text-muted:    #94a3b8;

  /* Status */
  --vt-success:       #10b981;
  --vt-error:         #ef4444;
  --vt-warning:       #f59e0b;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.05);
  --shadow-md:  0 4px 16px rgba(0,0,0,.10), 0 2px 6px rgba(0,0,0,.06);
  --shadow-lg:  0 20px 48px rgba(0,0,0,.14), 0 8px 16px rgba(0,0,0,.08);

  /* Layout */
  --widget-width:  380px;
  --widget-height: 580px;
  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  16px;
  --radius-xl:  20px;
  --radius-full: 9999px;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --text-xs:  0.75rem;
  --text-sm:  0.8125rem;
  --text-base:0.9375rem;

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

/* ── Reset ───────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font-sans);
  background: #f1f5f9;
  min-height: 100vh;
}

.hidden { display: none !important; }

/* ── Floating Toggle Button ──────────────────────────────────── */
.chat-toggle {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--vt-primary), var(--vt-accent));
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  z-index: 9999;
  transition: transform var(--transition), box-shadow var(--transition);
  color: var(--vt-white);
}

.chat-toggle:hover {
  transform: scale(1.08);
  box-shadow: 0 24px 56px rgba(37,99,235,.35);
}

.chat-toggle:active { transform: scale(0.96); }

.chat-toggle svg {
  width: 24px;
  height: 24px;
  transition: opacity var(--transition), transform var(--transition);
}

/* ── Chat Window ─────────────────────────────────────────────── */
.chat-window {
  position: fixed;
  bottom: 92px;
  right: 24px;
  width: var(--widget-width);
  height: var(--widget-height);
  background: var(--vt-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  z-index: 9998;
  overflow: hidden;
  border: 1px solid var(--vt-border);
  animation: slideUp 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(24px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0)    scale(1);    }
}

/* ── Header ──────────────────────────────────────────────────── */
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: linear-gradient(135deg, var(--vt-primary), #1e40af);
  color: var(--vt-white);
  flex-shrink: 0;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,.20);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.avatar svg { width: 18px; height: 18px; color: var(--vt-white); }

.assistant-name {
  font-size: var(--text-base);
  font-weight: 600;
  letter-spacing: -0.01em;
  display: block;
}

.assistant-status {
  font-size: var(--text-xs);
  opacity: 0.85;
  display: flex;
  align-items: center;
  gap: 5px;
  margin-top: 1px;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-full);
  background: var(--vt-success);
  box-shadow: 0 0 0 2px rgba(16,185,129,.3);
  animation: pulse 2s infinite;
  transition: background 0.3s;
}

.status-dot.offline {
  background: #ef4444;
  box-shadow: 0 0 0 2px rgba(239,68,68,.3);
  animation: none;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 2px rgba(16,185,129,.3); }
  50%       { box-shadow: 0 0 0 5px rgba(16,185,129,.1); }
}

.header-actions {
  display: flex;
  gap: 4px;
}

.btn-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: none;
  background: rgba(255,255,255,.12);
  color: var(--vt-white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

.btn-icon:hover  { background: rgba(255,255,255,.22); }
.btn-icon:active { background: rgba(255,255,255,.30); }
.btn-icon svg    { width: 16px; height: 16px; }

/* ── Messages Area ───────────────────────────────────────────── */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
  background: var(--vt-bg);
}

.chat-messages::-webkit-scrollbar { width: 4px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background: var(--vt-border); border-radius: 4px; }

/* ── Message Bubbles ─────────────────────────────────────────── */
.message-row {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  animation: fadeIn 0.18s ease;
}

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

.message-row.user  { flex-direction: row-reverse; }
.message-row.bot   { flex-direction: row; }

.message-avatar {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
}

.message-row.bot  .message-avatar { background: linear-gradient(135deg, var(--vt-primary), var(--vt-accent)); color: white; }
.message-row.user .message-avatar { background: var(--vt-border); color: var(--vt-text-secondary); }

.message-bubble {
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  line-height: 1.45;
  position: relative;
}

.message-content {
  flex: 1;
  min-width: 0;
  max-width: 82%;
}

.message-row.user .message-content { max-width: 82%; }

.message-row.user .message-bubble {
  background: linear-gradient(135deg, var(--vt-primary), var(--vt-primary-dark));
  color: var(--vt-white);
  border-bottom-right-radius: 4px;
}

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

/* Markdown-like formatting inside bot bubbles */
.message-bubble p   { margin: 0 0 4px; }
.message-bubble p:last-child { margin-bottom: 0; }
.message-bubble ul,
.message-bubble ol  { padding-left: 18px; margin: 2px 0 4px; }
.message-bubble li  { margin-bottom: 2px; }
.message-bubble strong { font-weight: 600; }
.message-bubble code {
  background: #f1f5f9;
  padding: 2px 5px;
  border-radius: 4px;
  font-family: 'Menlo', 'Consolas', monospace;
  font-size: 0.85em;
}

.message-time {
  font-size: 10px;
  color: var(--vt-text-muted);
  margin-top: 4px;
  text-align: right;
}

.message-row.bot .message-time { text-align: left; padding-left: 36px; }
.message-row.user .message-time { padding-right: 36px; }

/* Sources */
.message-sources {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px solid var(--vt-border);
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.source-tag {
  font-size: 10px;
  background: var(--vt-primary-light);
  color: var(--vt-primary);
  border-radius: var(--radius-sm);
  padding: 2px 7px;
  font-weight: 500;
}

/* ── Typing Indicator ────────────────────────────────────────── */
.typing-indicator .message-bubble {
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 5px;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-full);
  background: var(--vt-text-muted);
  animation: bounce 1.4s infinite ease-in-out;
}

.dot:nth-child(1) { animation-delay: 0s; }
.dot:nth-child(2) { animation-delay: 0.2s; }
.dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 80%, 100% { transform: scale(0.7); opacity: 0.5; }
  40%           { transform: scale(1.1); opacity: 1; }
}

/* ── Welcome Message ─────────────────────────────────────────── */
.welcome-card {
  background: linear-gradient(135deg, var(--vt-primary-light), #e0f2fe);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-lg);
  padding: 16px;
  text-align: center;
}

.welcome-card h3 {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--vt-text-primary);
  margin-bottom: 6px;
}

.welcome-card p {
  font-size: var(--text-sm);
  color: var(--vt-text-secondary);
  line-height: 1.5;
}

/* ── Suggestions ─────────────────────────────────────────────── */
.suggestions {
  padding: 0 16px 10px;
  background: var(--vt-bg);
  flex-shrink: 0;
}

.suggestions-label {
  font-size: var(--text-xs);
  color: var(--vt-text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 8px;
}

.suggestions-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.suggestion-chip {
  font-size: var(--text-xs);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  border: 1px solid var(--vt-border);
  background: var(--vt-white);
  color: var(--vt-primary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-sans);
  font-weight: 500;
}

.suggestion-chip:hover {
  background: var(--vt-primary);
  color: var(--vt-white);
  border-color: var(--vt-primary);
  transform: translateY(-1px);
}

/* ── Input Area ──────────────────────────────────────────────── */
.chat-input-area {
  padding: 12px 16px;
  background: var(--vt-white);
  border-top: 1px solid var(--vt-border);
  flex-shrink: 0;
}

.input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--vt-bg);
  border: 1.5px solid var(--vt-border);
  border-radius: var(--radius-lg);
  padding: 8px 8px 8px 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.input-wrapper:focus-within {
  border-color: var(--vt-primary);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}

.user-input {
  flex: 1;
  border: none;
  background: transparent;
  resize: none;
  font-size: var(--text-sm);
  font-family: var(--font-sans);
  color: var(--vt-text-primary);
  line-height: 1.5;
  max-height: 120px;
  outline: none;
  scrollbar-width: thin;
}

.user-input::placeholder { color: var(--vt-text-muted); }

.btn-send {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: none;
  background: var(--vt-primary);
  color: var(--vt-white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition);
}

.btn-send:hover:not(:disabled) { background: var(--vt-primary-dark); transform: scale(1.05); }
.btn-send:disabled { background: var(--vt-border); cursor: not-allowed; color: var(--vt-text-muted); }
.btn-send svg { width: 16px; height: 16px; }

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

.input-hint a { color: var(--vt-primary); text-decoration: none; }
.input-hint a:hover { text-decoration: underline; }

/* ── Error Toast ─────────────────────────────────────────────── */
.error-toast {
  position: fixed;
  bottom: 92px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--vt-error);
  color: var(--vt-white);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--text-sm);
  font-family: var(--font-sans);
  box-shadow: var(--shadow-md);
  z-index: 10000;
  animation: fadeIn 0.2s ease;
  max-width: 320px;
}

.error-toast svg { width: 16px; height: 16px; flex-shrink: 0; }

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 480px) {
  .chat-window {
    width: 100vw;
    height: 100dvh;
    bottom: 0;
    right: 0;
    border-radius: 0;
    border: none;
  }

  .chat-toggle {
    bottom: 16px;
    right: 16px;
  }
}