/* ============================================================
   AI Chat Cloud - Chat Page Styles (chat.css)
   Sidebar, message area, input area, empty state, suggestions.
   ============================================================ */

.chat-page {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ---------------- Sidebar ---------------- */

.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  background: var(--glass-bg);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  border-right: 1px solid var(--glass-border);
  transition: width 0.3s var(--ease), transform 0.3s var(--ease);
  z-index: 50;
}
.sidebar.collapsed { width: 0; border-right: none; overflow: hidden; }

.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  gap: var(--space-3);
}
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--text);
  white-space: nowrap;
}
.sidebar-logo .logo-mark { width: 30px; height: 30px; }
.sidebar-logo .logo-mark svg { width: 18px; height: 18px; }

.sidebar-toggle {
  width: 32px; height: 32px;
  border-radius: var(--r-sm);
  display: flex; align-items: center; justify-content: center;
  color: var(--text-2);
  transition: all var(--dur) var(--ease);
}
.sidebar-toggle:hover { background: var(--surface-hover); color: var(--text); }
.sidebar-toggle svg { width: 20px; height: 20px; }

.new-chat-btn {
  margin: 0 var(--space-4) var(--space-3);
  padding: 12px 16px;
  border-radius: var(--r-md);
  background: var(--brand-gradient);
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  box-shadow: 0 4px 16px rgba(124, 58, 237, 0.3);
  transition: all var(--dur) var(--ease);
}
.new-chat-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 22px rgba(124, 58, 237, 0.45); }
.new-chat-btn svg { width: 18px; height: 18px; }

.sidebar-search {
  margin: 0 var(--space-4) var(--space-3);
  position: relative;
}
.sidebar-search .input {
  padding-left: 38px;
  padding-top: 9px;
  padding-bottom: 9px;
  font-size: 0.88rem;
}
.sidebar-search svg {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 16px;
  height: 16px;
  color: var(--text-3);
  pointer-events: none;
}

.chat-list-section {
  flex: 1;
  overflow-y: auto;
  padding: 0 var(--space-4) var(--space-3);
}
.list-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  padding: var(--space-3) var(--space-2) var(--space-2);
  display: flex;
  align-items: center;
  gap: 6px;
}
.list-label svg { width: 13px; height: 13px; }

.chat-list { list-style: none; }
.chat-item {
  display: flex;
  align-items: center;
  border-radius: var(--r-md);
  margin-bottom: 2px;
  transition: background var(--dur) var(--ease);
  position: relative;
}
.chat-item:hover { background: var(--surface-hover); }
.chat-item.active { background: var(--surface-2); }
.chat-item.active::before {
  content: '';
  position: absolute;
  left: 0; top: 25%; bottom: 25%;
  width: 3px;
  border-radius: var(--r-full);
  background: var(--brand-gradient);
}
.chat-item-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 10px 10px;
  text-align: left;
  min-width: 0;
  gap: 2px;
}
.chat-item-title {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
}
.chat-item-preview {
  font-size: 0.75rem;
  color: var(--text-3);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  width: 100%;
}
.pin-indicator { display: none; }
.pin-indicator.pinned {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 6px;
  flex-shrink: 0;
}
.chat-item-actions {
  display: flex;
  gap: 2px;
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
  padding-right: 6px;
}
.chat-item:hover .chat-item-actions,
.chat-item.active .chat-item-actions { opacity: 1; }
.chat-item-actions .icon-btn { width: 28px; height: 28px; }
.chat-item-actions .icon-btn svg { width: 15px; height: 15px; }
.chat-delete:hover { color: var(--danger); }
.chat-list-empty {
  padding: var(--space-4);
  text-align: center;
  color: var(--text-3);
  font-size: 0.85rem;
}

.sidebar-foot {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.foot-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 9px 10px;
  border-radius: var(--r-md);
  color: var(--text-2);
  font-size: 0.88rem;
  font-weight: 500;
  transition: all var(--dur) var(--ease);
}
.foot-link:hover { background: var(--surface-hover); color: var(--text); }
.foot-link svg { width: 18px; height: 18px; }
.foot-link.danger:hover { color: var(--danger); }
.foot-link .connection-status { margin-left: auto; padding: 4px 10px; font-size: 0.72rem; }

/* ---------------- Main Chat Area ---------------- */

.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  position: relative;
}

.chat-topbar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--border);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}
.topbar-title {
  font-weight: 600;
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}
.model-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: var(--r-full);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-2);
  font-family: var(--font-mono);
}
.model-badge::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.topbar-actions { display: flex; gap: var(--space-2); }

/* Mobile sidebar toggle in topbar */
.mobile-menu-btn { display: none; }

/* ---------------- Messages ---------------- */

.messages-scroll {
  flex: 1;
  overflow-y: auto;
  scroll-behavior: smooth;
  padding: var(--space-6) var(--space-5);
}
.messages-inner {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.message {
  display: flex;
  gap: var(--space-3);
  animation: fadeInUp 0.4s var(--ease) both;
  max-width: 100%;
}
.message-user { flex-direction: row-reverse; }
.message-avatar {
  width: 36px; height: 36px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.message-assistant .message-avatar {
  background: var(--brand-gradient);
  color: #fff;
  box-shadow: var(--glow);
}
.message-user .message-avatar {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-2);
}
.message-avatar svg { width: 20px; height: 20px; }

.message-content {
  min-width: 0;
  max-width: calc(100% - 52px);
  display: flex;
  flex-direction: column;
}
.message-user .message-content { align-items: flex-end; }

.message-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: 4px;
}
.message-name { font-size: 0.8rem; font-weight: 700; color: var(--text); }
.message-time { font-size: 0.72rem; color: var(--text-3); }

.message-body {
  padding: 12px 16px;
  border-radius: var(--r-md);
  font-size: 0.95rem;
  line-height: 1.65;
  word-wrap: break-word;
  overflow-wrap: break-word;
}
.message-assistant .message-body {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top-left-radius: 4px;
}
.message-user .message-body {
  background: var(--brand-gradient);
  color: #fff;
  border-top-right-radius: 4px;
}
.message-user .message-body a { color: #fff; text-decoration: underline; }

/* Markdown inside messages */
.message-body p { margin-bottom: var(--space-3); }
.message-body p:last-child { margin-bottom: 0; }
.message-body h1, .message-body h2, .message-body h3,
.message-body h4, .message-body h5, .message-body h6 {
  margin: var(--space-4) 0 var(--space-2);
  font-weight: 700;
  line-height: 1.3;
}
.message-body h1 { font-size: 1.5rem; }
.message-body h2 { font-size: 1.3rem; }
.message-body h3 { font-size: 1.15rem; }
.message-body h4 { font-size: 1.05rem; }
.message-body ul, .message-body ol { margin: var(--space-3) 0; padding-left: var(--space-5); }
.message-body li { margin-bottom: 6px; }
.message-body blockquote {
  border-left: 3px solid var(--accent);
  padding: var(--space-2) var(--space-4);
  margin: var(--space-3) 0;
  background: var(--surface-2);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  color: var(--text-2);
}
.message-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: var(--space-4) 0;
}
.message-body table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-3) 0;
  font-size: 0.88rem;
}
.message-body th, .message-body td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}
.message-body th { background: var(--surface-2); font-weight: 700; }
.message-body a { color: var(--accent); text-decoration: underline; }

/* Streaming cursor */
.message.streaming .message-body::after {
  content: '▋';
  display: inline-block;
  margin-left: 2px;
  color: var(--accent);
  animation: blink 1s steps(2) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.message.error .message-body {
  border-color: rgba(239, 68, 68, 0.4);
  background: rgba(239, 68, 68, 0.08);
}

/* Message actions */
.message-actions {
  display: flex;
  gap: var(--space-1);
  margin-top: 6px;
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
  flex-wrap: wrap;
}
.message:hover .message-actions { opacity: 1; }
.msg-action-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: var(--r-sm);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-3);
  transition: all var(--dur) var(--ease);
}
.msg-action-btn:hover { background: var(--surface-hover); color: var(--text); }
.msg-action-btn svg { width: 14px; height: 14px; }
.msg-delete:hover { color: var(--danger); }

/* Typing indicator */
.typing-indicator {
  display: none;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
}
.typing-indicator .message-avatar {
  width: 36px; height: 36px;
  background: var(--brand-gradient);
  color: #fff;
}
.typing-dots { display: inline-flex; gap: 5px; padding: 12px 16px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--r-md); }
.typing-dots span {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--text-3);
  animation: typingBounce 1.2s infinite;
}
.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* Scroll-to-bottom button */
.scroll-bottom-btn {
  position: absolute;
  bottom: 140px;
  left: 50%;
  transform: translateX(-50%);
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
  display: none;
  align-items: center;
  justify-content: center;
  color: var(--text);
  z-index: 20;
  animation: scaleIn 0.2s var(--ease);
}
.scroll-bottom-btn svg { width: 20px; height: 20px; }

/* ---------------- Empty State ---------------- */

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-6);
  gap: var(--space-4);
}
.empty-icon {
  width: 80px; height: 80px;
  border-radius: var(--r-xl);
  background: var(--brand-gradient-soft);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  animation: floatY 4s ease-in-out infinite;
}
@keyframes floatY {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.empty-icon svg { width: 40px; height: 40px; }
.empty-state h2 { font-size: 1.6rem; font-weight: 700; }
.empty-state p { color: var(--text-2); max-width: 420px; }

.prompt-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
  margin-top: var(--space-4);
  max-width: 600px;
}
.suggestion-chip {
  padding: 10px 16px;
  border-radius: var(--r-md);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-2);
  font-size: 0.88rem;
  text-align: left;
  transition: all var(--dur) var(--ease);
  max-width: 280px;
}
.suggestion-chip:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

/* ---------------- Input Area ---------------- */

.input-area {
  padding: var(--space-4) var(--space-5) var(--space-5);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
}
.input-inner {
  max-width: 820px;
  margin: 0 auto;
}
.input-box {
  display: flex;
  align-items: flex-end;
  gap: var(--space-2);
  padding: 8px;
  border-radius: var(--r-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.input-box:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}
.input-tools { display: flex; gap: 2px; }
.input-tools .icon-btn { width: 36px; height: 36px; }
.input-tools .icon-btn svg { width: 19px; height: 19px; }

#prompt-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.5;
  resize: none;
  max-height: 200px;
  padding: 8px 4px;
  font-family: inherit;
}
#prompt-input::placeholder { color: var(--text-3); }

.send-btn {
  width: 40px; height: 40px;
  border-radius: var(--r-md);
  background: var(--brand-gradient);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(124, 58, 237, 0.35);
  transition: all var(--dur) var(--ease);
}
.send-btn:hover { transform: scale(1.05); }
.send-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.send-btn svg { width: 20px; height: 20px; }

.stop-btn {
  width: 40px; height: 40px;
  border-radius: var(--r-md);
  background: var(--danger);
  color: #fff;
  display: none;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 14px rgba(239, 68, 68, 0.35);
}
.stop-btn:hover { transform: scale(1.05); }
.stop-btn svg { width: 18px; height: 18px; }

.input-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-2);
  padding: 0 4px;
  font-size: 0.75rem;
  color: var(--text-3);
}
.input-meta .counters { display: flex; gap: var(--space-4); font-family: var(--font-mono); }
.input-hint kbd {
  display: inline-block;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.7rem;
}

/* ---------------- Sidebar Overlay (mobile) ---------------- */

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: 40;
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.sidebar-overlay.active { opacity: 1; }

/* ---------------- Responsive ---------------- */

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: var(--sidebar-w);
    transform: translateX(-100%);
    border-right: 1px solid var(--glass-border);
  }
  .sidebar.mobile-open { transform: translateX(0); }
  .sidebar.collapsed { width: var(--sidebar-w); }
  .sidebar-overlay.active { display: block; }
  .mobile-menu-btn { display: flex; }
  .messages-scroll { padding: var(--space-4); }
  .input-area { padding: var(--space-3) var(--space-4) var(--space-4); }
  .message-content { max-width: calc(100% - 48px); }
  .chat-topbar { padding: var(--space-3) var(--space-4); }
  .topbar-actions .icon-btn { width: 32px; height: 32px; }
}

@media (max-width: 480px) {
  .message-actions { opacity: 1; }
  .input-meta { flex-direction: column; gap: var(--space-1); align-items: flex-start; }
}