.agent-buffer {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--bg-primary);
  contain: strict;
  will-change: transform;
}

/* ── Messages Container ── */

.messages-container {
  flex: 1;
  overflow-y: overlay;
  padding: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
}

.empty-chat {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 12px;
  color: var(--text-faint);
  position: relative;
}

/* Warm accent glow behind the hero heading */
.empty-chat::before {
  content: '';
  position: absolute;
  width: 320px;
  height: 200px;
  background: radial-gradient(ellipse, rgba(196, 168, 130, 0.07) 0%, transparent 70%);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -55%);
  pointer-events: none;
  animation: warmPulse 4s ease-in-out infinite;
}

.empty-chat .hero-heading {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  margin: 0;
  position: relative;
  z-index: 1;
}

.empty-chat .hero-subtitle {
  font-size: 14px;
  color: var(--text-tertiary);
  margin: 0;
  max-width: 400px;
  text-align: center;
  line-height: 1.6;
  position: relative;
  z-index: 1;
}

.empty-chat p {
  font-size: 14px;
  margin: 0;
}

.no-model-prompt {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  z-index: 1;
}

.no-model-btn {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  font-size: 12px;
}

.no-model-btn:hover {
  background: var(--bg-hover);
}

/* ── Message Groups ── */

.message-group {
  display: flex;
  flex-direction: column;
  animation: fadeIn 0.3s ease;
}

.message-timestamp {
  font-size: 11px;
  color: var(--text-faint);
  text-align: center;
  padding: 20px 0 6px 0;
}

/* ── Messages ── */

.message {
  display: flex;
  flex-direction: column;
  padding: 20px 0;
  max-width: 100%;
}

.message.user {
  background: transparent;
  padding: 20px 0;
}

.message.assistant {
  background: var(--bg-secondary);
  padding: 24px 0;
}

.message.assistant.streaming {
  background: var(--bg-secondary);
  border-left: 2px solid var(--accent);
  animation: glowPulse 2s ease-in-out infinite;
  will-change: border-color, opacity;
}

.message.system {
  background: transparent;
  text-align: center;
  padding: 12px 0;
}

.message-content {
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.7;
  word-wrap: break-word;
  max-width: 680px;
  margin: 0 auto;
  width: 100%;
  padding: 0 48px;
}

.message.user .message-content {
  color: var(--text-primary);
}

.message.assistant .message-content {
  color: var(--text-secondary);
}

.message-content p {
  margin: 0 0 10px 0;
}

.message-content p:last-child {
  margin-bottom: 0;
}

/* Typography in messages */

.message-content h1,
.message-content h2,
.message-content h3,
.message-content h4,
.message-content h5,
.message-content h6 {
  margin: 20px 0 8px 0;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.message-content h1 { font-size: 18px; }
.message-content h2 { font-size: 16px; }
.message-content h3 { font-size: 15px; }

.message-content strong {
  color: var(--text-primary);
  font-weight: 600;
}

.message-content code {
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: 'SF Mono', 'Monaco', 'Menlo', 'Consolas', monospace;
  font-size: 12.5px;
  color: var(--accent);
}

.message-content pre {
  background: var(--bg-tertiary);
  padding: 0;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 12px 0;
  border: 1px solid var(--border-color);
  position: relative;
}

.message-content pre code {
  display: block;
  background: transparent;
  padding: 16px;
  color: var(--text-secondary);
  font-size: 13px;
  border-radius: 0;
  line-height: 1.55;
}

/* Language indicator on code blocks */
.message-content pre::before {
  content: '';
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-border), transparent);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.message-content ul,
.message-content ol {
  margin: 8px 0 8px 20px;
  padding: 0;
}

.message-content li {
  margin: 6px 0;
  color: var(--text-secondary);
}

.message-content li::marker {
  color: var(--text-faint);
}

.message-content blockquote {
  border-left: 2px solid var(--accent);
  padding-left: 16px;
  margin: 12px 0;
  color: var(--text-tertiary);
}

.system-message {
  font-size: 12px;
  color: var(--text-faint);
  font-style: italic;
  white-space: pre-wrap;
}

.system-message.system-error {
  color: #e5534b;
  font-weight: 500;
  font-style: normal;
  background: rgba(229, 83, 75, 0.08);
  border: 1px solid rgba(229, 83, 75, 0.2);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.5;
}

.system-message.system-retry {
  color: var(--accent);
  font-style: normal;
  font-size: 12px;
  animation: pulse 1.5s ease-in-out infinite;
}

/* ── Send Error Banner ── */

.send-error-banner {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 48px;
  background: rgba(229, 83, 75, 0.06);
  border-top: 1px solid rgba(229, 83, 75, 0.15);
  max-width: calc(680px + 96px);
  margin: 0 auto;
  width: 100%;
  animation: fadeIn 0.3s ease;
}

.send-error-text {
  flex: 1;
  font-size: 12px;
  color: #e5534b;
  line-height: 1.5;
  white-space: pre-wrap;
}

.send-error-dismiss {
  background: none;
  border: none;
  color: #e5534b;
  cursor: pointer;
  font-size: 14px;
  padding: 0 4px;
  opacity: 0.6;
  transition: opacity 0.2s ease;
  flex-shrink: 0;
  line-height: 1;
}

.send-error-dismiss:hover {
  opacity: 1;
}

/* ── Assistant Loading ── */

.message.assistant.streaming.waiting {
  animation: none;
}

.assistant-loading {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-faint);
  font-size: 13px;
}

.loading-dots {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.loading-dots span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.25;
  animation: loadingDot 1s ease-in-out infinite;
}

.loading-dots span:nth-child(2) {
  animation-delay: 0.2s;
}

.loading-dots span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes loadingDot {
  0%, 100% { opacity: 0.25; transform: translateY(0); }
  50% { opacity: 1; transform: translateY(-2px); }
}

/* ── Tool Block ── */

.tool-block {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin: 10px 0;
  overflow: hidden;
  animation: slideIn 0.25s ease;
}

.tool-block.running {
  border-color: var(--accent-border);
  animation: slideIn 0.25s ease, glowPulse 2.5s ease-in-out infinite;
  will-change: border-color, opacity;
}

.tool-block.completed {
  border-color: var(--border-color);
}

.tool-block.error {
  border-color: rgba(229, 83, 75, 0.3);
}

.tool-block-header {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 12px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 13px;
  text-align: left;
  transition: background 0.2s ease;
}

.tool-block-header:hover {
  background: rgba(255, 255, 255, 0.03);
}

.tool-block-chevron {
  color: var(--text-faint);
  font-size: 11px;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.tool-block-chevron.expanded {
  transform: rotate(90deg);
}

.tool-block-name {
  font-family: 'SF Mono', 'Monaco', 'Menlo', 'Consolas', monospace;
  color: var(--accent);
  font-weight: 600;
  font-size: 12px;
  flex-shrink: 0;
}

.tool-block-param {
  color: var(--text-faint);
  font-family: 'SF Mono', 'Monaco', 'Menlo', 'Consolas', monospace;
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.tool-block-status {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.tool-block-status.running {
  color: var(--accent);
  animation: pulse 1.5s ease-in-out infinite;
}

.tool-block-status.completed {
  color: #6bc46d;
}

.tool-block-status.error {
  color: #e5534b;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.tool-block-body {
  border-top: 1px solid var(--border-color);
  max-height: 300px;
  overflow-y: overlay;
}

.tool-block-body pre {
  margin: 0;
  padding: 12px;
  background: transparent;
  border: none;
  border-radius: 0;
}

.tool-block-body pre::before {
  display: none;
}

.tool-block-body code {
  font-family: 'SF Mono', 'Monaco', 'Menlo', 'Consolas', monospace;
  font-size: 12px;
  color: var(--text-tertiary);
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-all;
}

/* ── Thinking Block ── */

.thinking-block {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  margin: 10px 0;
  overflow: hidden;
}

.thinking-block-header {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 12px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  text-align: left;
}

.thinking-block-header:hover {
  background: rgba(255, 255, 255, 0.03);
}

.thinking-block-chevron {
  color: var(--text-faint);
  font-size: 11px;
  transition: transform 0.2s ease;
  flex-shrink: 0;
}

.thinking-block-chevron.expanded {
  transform: rotate(90deg);
}

.thinking-block-label {
  color: var(--text-tertiary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.thinking-block-label.streaming {
  color: var(--accent);
  animation: pulse 1.5s ease-in-out infinite;
}

.thinking-block-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
  border-top: 0 solid var(--border-color);
}

.thinking-block-body.expanded {
  max-height: 260px;
  overflow-y: auto;
  border-top-width: 1px;
}

.thinking-block-content {
  margin: 0;
  padding: 12px;
  font-family: 'SF Mono', 'Monaco', 'Menlo', 'Consolas', monospace;
  font-size: 12px;
  line-height: 1.55;
  color: var(--text-tertiary);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ── Input Area ── */

.input-area {
  padding: 16px 48px 28px 48px;
  background: var(--bg-primary);
  display: flex;
  align-items: flex-end;
  max-width: calc(680px + 96px);
  margin: 0 auto;
  width: 100%;
}

.input-pill {
  display: flex;
  flex-direction: column;
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 18px;
  padding: 4px 4px 4px 8px;
  transition: border-color 0.2s ease, box-shadow 0.25s ease;
}

.input-pill .model-badge {
  padding: 2px 10px;
  background: transparent;
  border: none;
  color: var(--text-faint);
  font-size: 11px;
  font-family: 'SF Mono', Monaco, Menlo, Consolas, monospace;
  cursor: pointer;
  text-align: left;
  transition: color 0.2s ease;
  align-self: flex-start;
  margin: 4px 0 0 4px;
}

.input-pill .model-badge:hover {
  color: var(--accent);
}

.input-pill-row {
  display: flex;
  align-items: flex-end;
  gap: 4px;
}

.input-pill textarea {
  flex: 1;
  min-height: 36px;
  max-height: 50vh;
  padding: 7px 8px;
  font-size: 14px;
  font-family: inherit;
  resize: none;
  overflow-y: auto;
  line-height: 1.5;
  background: transparent;
  border: none;
  color: var(--text-primary);
}

.input-pill textarea:focus {
  outline: none;
  border: none;
  box-shadow: none;
}

.input-pill textarea::placeholder {
  color: var(--text-faint);
}

.input-pill .send-btn {
  padding: 0;
  background: var(--accent);
  color: var(--bg-primary);
  font-weight: 600;
  border-radius: 50%;
  font-size: 16px;
  width: 36px;
  height: 36px;
  min-width: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  flex-shrink: 0;
  align-self: flex-end;
  margin-bottom: 2px;
}

.input-pill .send-btn:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: var(--glow);
}

.input-pill .send-btn:active:not(:disabled) {
  transform: scale(0.92);
}

.input-pill .send-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}