/* ==========================================================================
   Web Chat - NVIDIA Free Gateway
   ========================================================================== */

.chat-layout {
  display: flex;
  height: calc(100vh - 64px);
  overflow: hidden;
}

/* ---------- Sidebar phiên chat ---------- */
.chat-sidebar {
  width: 270px;
  flex-shrink: 0;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  padding: 16px 12px;
  gap: 12px;
  overflow: hidden;
}

.chat-sidebar-header {
  padding: 0 2px;
}

.chat-sidebar-header .btn {
  width: 100%;
}

.session-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.session-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 11px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  color: var(--text-muted);
  font-size: 0.85rem;
}

.session-item:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
}

.session-item.active {
  background: var(--primary-soft);
  border-color: var(--primary-border);
  color: var(--primary-dark);
  font-weight: 600;
}

:root[data-theme="dark"] .session-item.active {
  color: var(--primary);
}

.session-item .session-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.session-item .session-delete {
  opacity: 0;
  border: none;
  background: transparent;
  color: var(--text-sub);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 2px 6px;
  border-radius: 6px;
  flex-shrink: 0;
}

.session-item:hover .session-delete {
  opacity: 1;
}

.session-item .session-delete:hover {
  color: var(--danger);
  background: rgba(239, 68, 68, 0.1);
}

.chat-sidebar-footer {
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
  font-size: 0.72rem;
  color: var(--text-sub);
  text-align: center;
  line-height: 1.6;
}

/* ---------- Khung chat chính ---------- */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--bg-page);
}

.chat-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 22px;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-header);
  backdrop-filter: blur(10px);
  flex-wrap: wrap;
}

.model-selector-container {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.model-dropdown {
  min-width: 260px;
  padding: 7px 12px;
  font-size: 0.85rem;
}

.chat-topbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.model-speed-badge {
  font-size: 0.76rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 7px;
}

/* ---------- Vùng tin nhắn ---------- */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 26px 22px;
  scroll-behavior: smooth;
}

.chat-messages-inner {
  max-width: 860px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.chat-empty-state {
  max-width: 620px;
  margin: 8vh auto 0;
  text-align: center;
  animation: tabFade 0.3s ease;
}

.chat-empty-state .empty-logo {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  margin-bottom: 18px;
}

.chat-empty-state h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.chat-empty-state p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 24px;
}

.suggestion-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.suggestion-chip {
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-muted);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.suggestion-chip:hover {
  border-color: var(--primary-border);
  background: var(--primary-soft);
  color: var(--primary-dark);
}

:root[data-theme="dark"] .suggestion-chip:hover {
  color: var(--primary);
}

/* ---------- Bong bóng tin nhắn ---------- */
.msg-wrapper {
  display: flex;
  gap: 13px;
  animation: tabFade 0.25s ease;
}

.msg-avatar {
  width: 36px;
  height: 36px;
  border-radius: 11px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
}

.msg-assistant .msg-avatar {
  background: var(--primary-soft);
  border-color: var(--primary-border);
}

.msg-content-col {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.msg-role-name {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-sub);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.msg-user {
  flex-direction: row-reverse;
}

.msg-user .msg-content-col {
  align-items: flex-end;
}

.msg-bubble {
  padding: 13px 17px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  line-height: 1.7;
  word-break: break-word;
  max-width: 100%;
}

.msg-user .msg-bubble {
  background: var(--primary-gradient);
  color: #fff;
  border-bottom-right-radius: 4px;
  max-width: 85%;
}

.msg-user .msg-bubble a {
  color: #fff;
  text-decoration: underline;
}

.msg-assistant .msg-bubble {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-top-left-radius: 4px;
  box-shadow: var(--shadow-sm);
}

.msg-attachment-img {
  max-width: 240px;
  max-height: 200px;
  border-radius: 10px;
  display: block;
  margin-bottom: 8px;
  border: 1px solid var(--border-color);
}

.msg-attachment-file {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  background: rgba(0, 0, 0, 0.08);
  padding: 4px 10px;
  border-radius: 7px;
  margin-bottom: 8px;
  margin-right: 6px;
}

:root[data-theme="dark"] .msg-attachment-file {
  background: rgba(255, 255, 255, 0.1);
}

.msg-footer {
  display: flex;
  gap: 8px;
}

.btn-msg-action {
  border: none;
  background: transparent;
  color: var(--text-sub);
  font-size: 0.74rem;
  cursor: pointer;
  padding: 3px 8px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all var(--transition-fast);
}

.btn-msg-action:hover {
  color: var(--text-main);
  background: var(--bg-card-hover);
}

/* ---------- Markdown nội dung ---------- */
.msg-bubble p {
  margin: 0 0 10px;
}

.msg-bubble p:last-child {
  margin-bottom: 0;
}

.msg-bubble ul, .msg-bubble ol {
  margin: 6px 0 10px;
  padding-left: 22px;
}

.msg-bubble li {
  margin-bottom: 4px;
}

.msg-bubble h1, .msg-bubble h2, .msg-bubble h3, .msg-bubble h4 {
  margin: 14px 0 8px;
  font-size: 1.02rem;
}

.msg-bubble code {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  background: var(--bg-code);
  border: 1px solid var(--border-color);
  padding: 1.5px 6px;
  border-radius: 5px;
}

.msg-user .msg-bubble code {
  background: rgba(255, 255, 255, 0.18);
  border-color: rgba(255, 255, 255, 0.25);
}

.msg-bubble pre {
  position: relative;
  background: var(--bg-code);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 34px 14px 13px;
  overflow-x: auto;
  margin: 10px 0;
}

.msg-bubble pre code {
  background: transparent;
  border: none;
  padding: 0;
  font-size: 0.8rem;
  line-height: 1.65;
  display: block;
}

.pre-lang-tag {
  position: absolute;
  top: 8px;
  left: 14px;
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-sub);
}

.pre-copy-btn {
  position: absolute;
  top: 5px;
  right: 7px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-muted);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 6px;
  cursor: pointer;
}

.pre-copy-btn:hover {
  color: var(--text-main);
}

.msg-bubble table {
  border-collapse: collapse;
  width: 100%;
  margin: 10px 0;
  font-size: 0.84rem;
}

.msg-bubble th, .msg-bubble td {
  border: 1px solid var(--border-color);
  padding: 7px 11px;
  text-align: left;
}

.msg-bubble th {
  background: var(--bg-card-hover);
  font-weight: 700;
}

.msg-bubble blockquote {
  border-left: 3px solid var(--primary);
  padding: 2px 0 2px 14px;
  margin: 10px 0;
  color: var(--text-muted);
}

/* ---------- Khối suy luận (reasoning) ---------- */
.reasoning-block {
  margin-bottom: 10px;
  border: 1px dashed var(--border-color);
  border-radius: 9px;
  overflow: hidden;
}

.reasoning-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  border: none;
  background: var(--bg-card-hover);
  color: var(--text-sub);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
}

.reasoning-content {
  padding: 9px 13px;
  font-size: 0.8rem;
  color: var(--text-muted);
  font-style: italic;
  white-space: pre-wrap;
  max-height: 220px;
  overflow-y: auto;
  border-top: 1px dashed var(--border-color);
}

/* ---------- Con trỏ đang gõ ---------- */
.typing-cursor {
  display: inline-block;
  width: 8px;
  height: 16px;
  background: var(--primary);
  vertical-align: text-bottom;
  margin-left: 2px;
  border-radius: 2px;
  animation: blink 0.85s infinite;
}

.thinking-dots {
  display: inline-flex;
  gap: 5px;
  padding: 6px 2px;
}

.thinking-dots span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--primary);
  animation: dotPulse 1.2s infinite;
}

.thinking-dots span:nth-child(2) { animation-delay: 0.18s; }
.thinking-dots span:nth-child(3) { animation-delay: 0.36s; }

@keyframes dotPulse {
  0%, 70%, 100% { opacity: 0.25; transform: scale(0.85); }
  35% { opacity: 1; transform: scale(1); }
}

/* ---------- Khung nhập liệu ---------- */
.chat-input-area {
  padding: 14px 22px 20px;
}

.chat-input-container {
  max-width: 860px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 12px 14px 10px;
  transition: border var(--transition-fast);
}

.chat-input-container:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.attachment-tray {
  display: flex;
  gap: 9px;
  flex-wrap: wrap;
  margin-bottom: 4px;
}

.attachment-tray:empty {
  display: none;
}

.attachment-item {
  position: relative;
  width: 64px;
  height: 64px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  overflow: hidden;
}

.attachment-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.attachment-remove {
  position: absolute;
  top: 3px;
  right: 3px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  border: none;
  background: rgba(0, 0, 0, 0.65);
  color: #fff;
  font-size: 0.65rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chat-textarea {
  width: 100%;
  border: none !important;
  background: transparent !important;
  box-shadow: none !important;
  resize: none;
  min-height: 44px;
  max-height: 200px;
  padding: 8px 4px;
  font-size: 0.94rem;
}

.chat-input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-top: 6px;
}

.chat-input-footer .input-hint {
  font-size: 0.72rem;
  color: var(--text-sub);
}

.chat-action-btns {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-send {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  border: none;
  background: var(--primary-gradient);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  box-shadow: 0 2px 10px rgba(118, 185, 0, 0.35);
}

.btn-send:hover:not(:disabled) {
  filter: brightness(1.07);
  transform: translateY(-1px);
}

.btn-send:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-send.btn-stop {
  background: var(--danger);
  box-shadow: 0 2px 10px rgba(239, 68, 68, 0.35);
}

/* ---------- Modal cài đặt chat ---------- */
.settings-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 16px;
}

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .chat-sidebar {
    display: none;
  }
  .model-dropdown {
    min-width: 180px;
  }
}