.ai-card {
  margin-top: 14px;
  border-radius: 10px;
  border: 1px solid var(--border2);
  background: var(--surface);
  overflow: hidden;
  transition: border-color 0.3s, box-shadow 0.3s;
  position: relative;
}

.ai-card--streaming {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border2));
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--accent) 10%, transparent);
}

.ai-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  background: var(--surface2);
  border-bottom: 1px solid var(--border);
  flex-wrap: nowrap;
}

.ai-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 500;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
  border-radius: 20px;
  padding: 3px 9px;
  white-space: nowrap;
}

.ai-badge i {
  font-size: 11px;
  animation: none;
}
.ai-card--streaming .ai-badge i {
  animation: ai-pulse 1.2s ease-in-out infinite;
}

@keyframes ai-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.55; transform: scale(0.9); }
}

.ai-model-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  color: var(--ink3);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  white-space: nowrap;
}

.ai-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.ai-quiz-btn, .ai-clear-btn, .ai-draw-btn {
  background: none;
  border: 1px solid transparent;
  color: var(--ink3);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: 0.2s;
  display: flex;
  align-items: center;
  gap: 4px;
}
.ai-quiz-btn:hover, .ai-clear-btn:hover, .ai-draw-btn:hover {
  background: var(--surface2);
  color: var(--ink2);
}
.ai-quiz-btn.active {
  background: color-mix(in srgb, var(--accent3) 15%, transparent);
  color: var(--accent3);
  border-color: color-mix(in srgb, var(--accent3) 30%, transparent);
}
.ai-draw-btn.active {
  background: color-mix(in srgb, #e02020 15%, transparent);
  color: #e02020;
  border-color: color-mix(in srgb, #e02020 30%, transparent);
}

.ai-explain-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  font-weight: 500;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 5px;
  padding: 5px 11px;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s, background 0.15s;
  white-space: nowrap;
}
.ai-explain-btn:hover { opacity: 0.88; }
.ai-explain-btn:active { transform: scale(0.96); }
.ai-explain-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}
.ai-card--streaming .ai-explain-btn,
.ai-card--loading .ai-explain-btn {
  background: var(--accent2);
}

.ai-spinner {
  width: 14px;
  height: 14px;
  border: 2px solid color-mix(in srgb, var(--accent) 30%, transparent);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: ai-spin 0.75s linear infinite;
  display: inline-block;
  flex-shrink: 0;
}
@keyframes ai-spin {
  to { transform: rotate(360deg); }
}

.ai-card-body {
  padding: 14px 16px;
  min-height: 56px;
  max-height: 350px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-family: 'DM Sans', sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink2);
}
.ai-card-body::-webkit-scrollbar {
  width: 6px;
}
.ai-card-body::-webkit-scrollbar-thumb {
  background: var(--border2);
  border-radius: 3px;
}

.ai-placeholder {
  color: var(--ink3);
  font-size: 14px;
  font-family: 'DM Sans', sans-serif;
  margin: 0;
}
.ai-placeholder strong { color: var(--ink2); font-weight: 500; }

.ai-stream-text {
  margin: 0;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.75;
  letter-spacing: 0.01em;
}
.ai-stream-text ul {
  margin: 10px 0 10px 24px;
  padding: 0;
}
.ai-stream-text li {
  margin-bottom: 6px;
}
.ai-stream-text li:last-child {
  margin-bottom: 0;
}
.ai-stream-text strong {
  font-weight: 600;
  color: var(--ink);
}
.ai-stream-text em {
  font-style: italic;
}

.ai-cursor {
  display: inline-block;
  color: var(--accent);
  font-weight: bold;
  animation: ai-blink 0.8s step-start infinite;
  margin-left: 1px;
  font-size: 15px;
  line-height: 1;
  vertical-align: middle;
}
@keyframes ai-blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.ai-error {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--accent2);
  font-size: 13px;
  font-family: 'JetBrains Mono', monospace;
  margin: 0;
}
.ai-error i { font-size: 14px; flex-shrink: 0; }

.ai-card--loading .ai-card-body::after {
  content: '';
  display: block;
  height: 13px;
  width: 75%;
  border-radius: 4px;
  background: var(--surface2);
  animation: ai-shimmer 1.4s infinite alternate;
  margin-top: 4px;
}
@keyframes ai-shimmer {
  0%   { opacity: 0.5; }
  100% { opacity: 1; }
}

.ai-msg {
  display: flex;
  flex-direction: column;
  max-width: 95%;
  overflow-wrap: break-word;
}
.ai-msg-user {
  align-self: flex-end;
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
  padding: 8px 14px;
  border-radius: 12px 12px 0 12px;
}
.ai-msg-user .ai-stream-text {
  font-size: 14px;
}
.ai-msg-assistant {
  align-self: flex-start;
  background: var(--surface2);
  border: 1px solid var(--border);
  padding: 10px 14px;
  border-radius: 12px 12px 12px 0;
}
.ai-msg-error {
  align-self: flex-start;
  background: rgba(212,112,112,0.15);
  padding: 8px 14px;
  border-radius: 12px;
  border: 1px solid rgba(212,112,112,0.3);
}

.ai-chat-bar {
  display: flex;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  background: var(--surface2);
  align-items: center;
}

.ai-chat-input {
  flex: 1;
  border: 1px solid var(--border2);
  border-radius: 6px;
  padding: 8px 12px;
  background: var(--surface);
  color: var(--ink);
  font-family: 'DM Sans', sans-serif;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}
.ai-chat-input:focus {
  border-color: var(--accent);
}

.ai-send-btn, .ai-mic-btn {
  background: none;
  border: none;
  color: var(--ink3);
  cursor: pointer;
  border-radius: 6px;
  padding: 8px 10px;
  font-size: 14px;
  transition: 0.2s;
}
.ai-send-btn:hover, .ai-mic-btn:hover {
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}
.ai-mic-btn.recording {
  color: #e02020;
  animation: pulse-red 1.2s infinite alternate;
  background: rgba(224,32,32,0.1);
}

@keyframes pulse-red {
  0% { opacity: 0.6; transform: scale(0.95); }
  100% { opacity: 1; transform: scale(1.05); }
}

.ai-speaker-btn {
  background: none;
  border: 1px solid transparent;
  color: var(--ink3);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: 0.2s;
  display: flex;
  align-items: center;
  gap: 4px;
}
.ai-speaker-btn:hover {
  background: var(--surface2);
  color: var(--ink2);
}
.ai-speaker-btn.active {
  color: var(--accent);
}

.ai-highlight-pulse {
  animation: ai-glow 1.5s ease-in-out infinite alternate;
  outline: 2px solid var(--accent) !important;
  outline-offset: 2px;
  border-radius: 4px;
  transition: all 0.3s ease;
  scroll-margin: 50px;
}
@keyframes ai-glow {
  0% { box-shadow: 0 0 5px color-mix(in srgb, var(--accent) 40%, transparent); }
  100% { box-shadow: 0 0 20px color-mix(in srgb, var(--accent) 80%, transparent); }
}

.ai-annotation-overlay {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: color-mix(in srgb, var(--surface) 90%, transparent);
  backdrop-filter: blur(8px);
  border: 1px solid var(--accent);
  color: var(--ink);
  font-family: 'DM Sans', sans-serif;
  font-size: 14px;
  padding: 8px 16px;
  border-radius: 20px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.15);
  z-index: 1000;
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: slide-down 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.ai-annotation-overlay i {
  color: var(--accent);
  font-size: 16px;
}
@keyframes slide-down {
  from { top: -20px; opacity: 0; transform: translateX(-50%) scale(0.9); }
  to { top: 20px; opacity: 1; transform: translateX(-50%) scale(1); }
}
.ai-annotation-fade-out {
  animation: fade-out 0.4s ease-in forwards;
}
@keyframes fade-out {
  from { opacity: 1; transform: translateX(-50%) scale(1); }
  to { opacity: 0; transform: translateX(-50%) scale(0.9); top: 10px; }
}

.ai-thought-process {
  font-size: 13px;
  color: var(--ink3);
  background: var(--surface2);
  border-left: 3px solid color-mix(in srgb, var(--accent) 50%, transparent);
  margin: 12px 0;
  padding: 8px 12px;
  border-radius: 6px;
}
.ai-thought-process summary {
  cursor: pointer;
  font-weight: 500;
  user-select: none;
  color: var(--accent);
  outline: none;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
}
.ai-thought-process summary:hover {
  text-decoration: underline;
}
.ai-thought-process .content {
  margin-top: 8px;
  white-space: pre-wrap;
  line-height: 1.5;
  font-family: 'DM Sans', sans-serif;
  color: var(--ink2);
}