/* Chat mode — theme-aware middle pane (light / soft / dark / glass) */

#chatRoot {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  --chat-panel-bg: var(--surface, #fff);
  --chat-panel-border: var(--border, #ddd);
  --chat-list-bg: transparent;
  --chat-compose-bg: var(--surface-muted, #fafafa);
  --chat-input-bg: var(--surface, #fff);
  --chat-input-border: color-mix(in srgb, var(--border, #cbd5e1) 85%, transparent);
  --chat-bubble-other: var(--surface-muted, #f1f5f9);
  --chat-bubble-mine: color-mix(in srgb, var(--accent, #0078d4) 16%, var(--surface, #fff));
  --chat-bubble-mine-border: color-mix(in srgb, var(--accent, #0078d4) 28%, transparent);
  --chat-meta: var(--text-muted, #64748b);
  --chat-empty: var(--text-muted, #64748b);
  --chat-lock-bg: color-mix(in srgb, #f97316 12%, var(--surface-muted, #fff7ed));
  --chat-lock-border: color-mix(in srgb, #f97316 35%, var(--border, #fed7aa));
  --chat-lock-text: color-mix(in srgb, #9a3412 85%, var(--text, #7c2d12));
}

.chat-mode-hint {
  font-size: 12px;
  color: var(--text-muted, #64748b);
  margin: 0 0 8px;
  line-height: 1.4;
}

.chat-main-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

#chatRoot .main-content {
  gap: 8px;
  padding: 0 0 8px;
  box-sizing: border-box;
}

.chat-room-panel {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  min-width: 0;
  border: 1px solid var(--chat-panel-border);
  border-radius: 6px;
  background: var(--chat-panel-bg);
  box-sizing: border-box;
  overflow: hidden;
  color: var(--text, inherit);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04);
}

.chat-room-empty {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  color: var(--chat-empty);
  text-align: center;
  font-size: 14px;
}

.chat-message-list {
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--chat-list-bg);
}

.chat-message {
  max-width: min(92%, 520px);
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--chat-bubble-other);
  border: 1px solid color-mix(in srgb, var(--chat-panel-border) 70%, transparent);
  align-self: flex-start;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.chat-message--mine {
  background: var(--chat-bubble-mine);
  border-color: var(--chat-bubble-mine-border);
}

.chat-message__meta {
  font-size: 11px;
  color: var(--chat-meta);
  margin-bottom: 4px;
  letter-spacing: 0.01em;
}

.chat-message__body {
  font-size: 14px;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text, inherit);
}

.chat-compose {
  display: flex;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--chat-panel-border);
  background: var(--chat-compose-bg);
  flex-shrink: 0;
}

.chat-compose textarea {
  flex: 1;
  min-height: 44px;
  max-height: 120px;
  resize: vertical;
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--chat-input-border);
  border-radius: 8px;
  background: var(--chat-input-bg);
  color: var(--text, inherit);
  box-sizing: border-box;
}

.chat-compose textarea::placeholder {
  color: var(--text-muted, #94a3b8);
}

.chat-compose textarea:focus {
  outline: 2px solid color-mix(in srgb, var(--accent, #0078d4) 45%, transparent);
  outline-offset: 1px;
  border-color: color-mix(in srgb, var(--accent, #0078d4) 40%, var(--chat-input-border));
}

.chat-lock-banner {
  padding: 10px 12px;
  background: var(--chat-lock-bg);
  border-bottom: 1px solid var(--chat-lock-border);
  color: var(--chat-lock-text);
  font-size: 13px;
  flex-shrink: 0;
}

.chat-lock-form {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 8px;
}

.chat-lock-form input[type="password"] {
  min-width: 160px;
  padding: 6px 8px;
  border: 1px solid var(--chat-input-border);
  border-radius: 6px;
  background: var(--chat-input-bg);
  color: var(--text, inherit);
}

.chat-detail-section {
  margin-bottom: 14px;
}

.chat-detail-section h4 {
  margin: 0 0 6px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted, #64748b);
}

.chat-link-row {
  display: flex;
  gap: 6px;
  align-items: stretch;
}

.chat-link-row input {
  flex: 1;
  min-width: 0;
  font-size: 12px;
  padding: 6px 8px;
  border: 1px solid var(--chat-input-border);
  border-radius: 6px;
  background: var(--chat-input-bg);
  color: var(--text, inherit);
}

.chat-detail-lock label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  margin-bottom: 8px;
  color: var(--text, inherit);
}

#chatRoot .archive-tree .chat-tree-hub {
  font-weight: 600;
}

#chatRoot .archive-tree .chat-tree-room {
  padding-left: 18px;
}

#chatRoot .archive-tree li.selected > .tree-row {
  background: color-mix(in srgb, var(--accent, #0078d4) 14%, transparent);
}

#chatRoot .archive-tree .tree-row--locked::after {
  content: " 🔒";
  font-size: 11px;
}

/* ========== Dark + soft themes ========== */

html[data-theme="dark"] #chatRoot,
html[data-theme="soft"] #chatRoot {
  --chat-panel-bg: var(--surface);
  --chat-compose-bg: var(--surface-muted);
  --chat-input-bg: #14171f;
  --chat-bubble-other: #252830;
  --chat-bubble-mine: color-mix(in srgb, var(--accent) 22%, #1c1f28);
  --chat-bubble-mine-border: color-mix(in srgb, var(--accent) 38%, var(--border));
  --chat-lock-bg: color-mix(in srgb, #ea580c 18%, var(--surface-muted));
  --chat-lock-border: color-mix(in srgb, #ea580c 40%, var(--border));
  --chat-lock-text: #fdba74;
}

html[data-theme="dark"] #chatRoot .chat-room-panel,
html[data-theme="soft"] #chatRoot .chat-room-panel {
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.04) inset;
}

html[data-theme="dark"] #chatRoot .chat-compose textarea,
html[data-theme="soft"] #chatRoot .chat-compose textarea,
html[data-theme="dark"] #chatRoot .chat-lock-form input[type="password"],
html[data-theme="soft"] #chatRoot .chat-lock-form input[type="password"],
html[data-theme="dark"] #chatRoot .chat-link-row input,
html[data-theme="soft"] #chatRoot .chat-link-row input {
  caret-color: var(--text);
}

/* ========== Glass theme ========== */

html[data-theme="glass"] #chatRoot {
  --chat-panel-bg: rgba(255, 255, 255, 0.07);
  --chat-panel-border: var(--glass-edge, rgba(255, 255, 255, 0.22));
  --chat-list-bg: rgba(255, 255, 255, 0.03);
  --chat-compose-bg: rgba(255, 255, 255, 0.05);
  --chat-input-bg: rgba(255, 255, 255, 0.06);
  --chat-input-border: var(--glass-edge, rgba(255, 255, 255, 0.2));
  --chat-bubble-other: rgba(255, 255, 255, 0.08);
  --chat-bubble-mine: color-mix(in srgb, var(--accent) 28%, rgba(255, 255, 255, 0.1));
  --chat-bubble-mine-border: color-mix(in srgb, var(--accent) 45%, rgba(255, 255, 255, 0.2));
  --chat-lock-bg: rgba(234, 88, 12, 0.12);
  --chat-lock-border: rgba(251, 146, 60, 0.35);
  --chat-lock-text: #fed7aa;
}

html[data-theme="glass"] #chatRoot .chat-room-panel {
  backdrop-filter: blur(14px) saturate(1.25);
  -webkit-backdrop-filter: blur(14px) saturate(1.25);
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.1) inset,
    0 8px 28px rgba(0, 0, 0, 0.28);
}

html[data-theme="glass"] #chatRoot .chat-message {
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

html[data-theme="glass"] #chatRoot .chat-compose {
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* High-contrast a11y view */
html[data-a11y-view="contrast"] #chatRoot .chat-message {
  border-width: 2px;
}

html[data-a11y-view="contrast"] #chatRoot .chat-compose textarea:focus {
  outline-width: 3px;
}