.mope-chat {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-raised: #ffffff;
  --card: #ffffff;
  --border: #fee2e2;
  --border-strong: #fecaca;
  --text: #111827;
  --text-muted: #6b7280;
  --accent: #dc2626;
  --accent-hover: #ef4444;
  --green: #16a34a;
  --yellow: #f59e0b;
  --red: #dc2626;
  --purple: #7c3aed;
  --button-text: #ffffff;
  --surface-hover: rgba(220, 38, 38, 0.04);
  --surface-hover-strong: rgba(220, 38, 38, 0.08);
  --accent-soft: rgba(220, 38, 38, 0.08);
  --accent-soft-strong: rgba(220, 38, 38, 0.16);
  --danger-soft: rgba(220, 38, 38, 0.10);
  --shadow-soft: 0 14px 40px rgba(15, 23, 42, 0.07);
  --shadow-card: 0 8px 24px rgba(15, 23, 42, 0.05);

  --text-primary: var(--text);
  --text-secondary: var(--text-muted);
  --border-color: var(--border);
  --bg-secondary: var(--surface);
  --accent-blue: var(--accent);

  --phase-starting: var(--accent);
  --phase-diverging: var(--yellow);
  --phase-closing: var(--green);
  --phase-done: var(--purple);

  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

.mope-chat.mope-chat-dark {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-raised: #111827;
  --card: #0f172a;
  --border: rgba(30, 64, 175, 0.45);
  --border-strong: rgba(59, 130, 246, 0.45);
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #60a5fa;
  --green: #10b981;
  --yellow: #f59e0b;
  --red: #f43f5e;
  --purple: #8b5cf6;
  --button-text: #ffffff;
  --surface-hover: rgba(255, 255, 255, 0.03);
  --surface-hover-strong: rgba(255, 255, 255, 0.06);
  --accent-soft: rgba(59, 130, 246, 0.14);
  --accent-soft-strong: rgba(59, 130, 246, 0.22);
  --danger-soft: rgba(244, 63, 94, 0.12);
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.28);
  --shadow-card: 0 12px 28px rgba(0, 0, 0, 0.22);
}

.mope-chat,
.mope-chat * {
  box-sizing: border-box;
}

.mope-chat {
  color: var(--text);
  min-height: 100%;
  transition: background 0.2s ease, color 0.2s ease;
}

.mope-chat input,
.mope-chat textarea,
.mope-chat select,
.mope-chat button {
  font: inherit;
}

.mope-chat p,
.mope-chat h1,
.mope-chat h2,
.mope-chat h3,
.mope-chat h4,
.mope-chat pre {
  margin-top: 0;
}

.mope-chat ::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
.mope-chat ::-webkit-scrollbar-track {
  background: var(--surface);
}
.mope-chat ::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
.mope-chat ::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Idle: centered form */
.mope-chat.app-idle {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 96px);
  padding: 36px 40px 42px;
  background:
    radial-gradient(circle at top center, var(--accent-soft) 0, transparent 34%),
    var(--bg);
}

.mope-chat.app-idle-scroll {
  align-items: flex-start;
  overflow-y: auto;
}

/* Running / done: two-column */
.mope-chat.app-running {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 96px);
  overflow: hidden;
  background: var(--surface-raised);
  border-radius: 18px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-card);
}

.mope-chat .app-header {
  background: color-mix(in srgb, var(--surface) 92%, var(--accent) 8%);
  border-bottom: 1px solid var(--border);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.mope-chat .app-header-logo {
  font-weight: 700;
  font-size: 15px;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.mope-chat .app-header-task {
  flex: 1;
  color: var(--text-muted);
  font-size: 13px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.mope-chat .app-body {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.mope-chat .app-sidebar {
  width: 250px;
  flex-shrink: 0;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 96%, var(--accent) 4%);
}

.mope-chat .app-main {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  background: var(--bg);
}

.mope-chat .app-progress-sidebar {
  width: 320px;
  flex-shrink: 0;
  overflow-y: auto;
  border-left: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 96%, var(--accent) 4%);
}

.mope-chat .app-side-panel {
  position: relative;
  transition: width 0.22s ease, background 0.2s ease;
}

.mope-chat .app-side-panel.collapsed {
  width: 44px;
  overflow: hidden;
}

.mope-chat .app-side-toggle {
  position: sticky;
  top: 10px;
  z-index: 2;
  width: 28px;
  height: 28px;
  min-width: 28px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-raised);
  color: var(--text-muted);
  box-shadow: var(--shadow-card);
}

.mope-chat .app-side-toggle:hover:not(:disabled) {
  color: var(--accent);
  border-color: var(--border-strong);
  background: var(--surface-hover-strong);
  transform: translateY(-1px);
}

.mope-chat .app-side-toggle-left {
  float: right;
  margin: 10px 10px 0 0;
}

.mope-chat .app-side-toggle-right {
  float: left;
  margin: 10px 0 0 10px;
}

.mope-chat .app-side-panel.collapsed .app-side-toggle-left,
.mope-chat .app-side-panel.collapsed .app-side-toggle-right {
  float: none;
  margin: 10px auto 0;
}

/* Buttons */
.mope-chat button {
  cursor: pointer;
  border: none;
  border-radius: 10px;
  padding: 8px 16px;
  font-size: 13px;
  font-family: inherit;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s, background 0.15s, border-color 0.15s, color 0.15s;
}

.mope-chat button:hover:not(:disabled) {
  transform: translateY(-1px);
}

.mope-chat button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.mope-chat .btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: var(--button-text);
  font-weight: 600;
  box-shadow: 0 10px 22px var(--accent-soft-strong);
}

.mope-chat .btn-primary:hover:not(:disabled) {
  opacity: 0.85;
}

.mope-chat .btn-danger {
  background: transparent;
  color: var(--red);
  border: 1px solid var(--red);
}

.mope-chat .btn-danger:hover:not(:disabled) {
  background: var(--danger-soft);
}

.mope-chat .btn-secondary {
  background: var(--surface-raised);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.mope-chat .btn-secondary:hover:not(:disabled) {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--surface-hover);
}

.mope-chat .btn-ghost {
  background: transparent;
  color: var(--text-muted);
  padding: 4px 8px;
  font-size: 12px;
}

.mope-chat .btn-ghost:hover {
  color: var(--text);
}

/* Badges */
.mope-chat .badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.mope-chat .badge-starting { background: color-mix(in srgb, var(--accent) 15%, transparent); color: var(--accent); }
.mope-chat .badge-diverging { background: color-mix(in srgb, var(--yellow) 15%, transparent); color: var(--yellow); }
.mope-chat .badge-closing { background: color-mix(in srgb, var(--green) 15%, transparent); color: var(--green); }
.mope-chat .badge-done { background: color-mix(in srgb, var(--purple) 15%, transparent); color: var(--purple); }
.mope-chat .badge-default { background: color-mix(in srgb, var(--text-muted) 15%, transparent); color: var(--text-muted); }

/* Spinner */
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.mope-chat .spinner {
  display: inline-block;
  animation: spin 1s linear infinite;
}

/* Reference cite */
.mope-chat .ref-cite {
  display: inline-block;
  background: var(--accent-soft-strong);
  color: var(--accent);
  border-radius: 4px;
  padding: 0 3px;
  font-family: 'SFMono-Regular', Consolas, monospace;
  font-size: 11px;
  cursor: pointer;
  position: relative;
}

.mope-chat .ref-cite:hover::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 4px 8px;
  border-radius: 4px;
  font-size: 11px;
  white-space: nowrap;
  z-index: 100;
  font-family: inherit;
  pointer-events: none;
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Error banner */
.mope-chat .error-banner {
  background: var(--danger-soft);
  border: 1px solid var(--red);
  border-radius: 6px;
  padding: 8px 12px;
  color: var(--red);
  font-size: 13px;
  margin-bottom: 12px;
}

@media (max-width: 1200px) {
  .mope-chat .app-progress-sidebar {
    width: 260px;
  }
}

@media (max-width: 960px) {
  .mope-chat .app-body {
    flex-direction: column;
  }

  .mope-chat .app-sidebar,
  .mope-chat .app-progress-sidebar {
    width: 100%;
    border-right: none;
    border-left: none;
    border-bottom: 1px solid var(--border);
    max-height: 260px;
  }

  .mope-chat .app-main {
    padding: 14px;
  }
}