:root {
  --bg: #0f1419;
  --card: #1a2332;
  --text: #e7ecf3;
  --muted: #8b9bb4;
  --accent: #4cc2ff;
  --border: #2a3a52;
}

* {
  box-sizing: border-box;
}
body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  max-width: min(1540px, 100%);
  margin: 0 auto;
  padding: 1.25rem;
}

.top h1 {
  margin: 0 0 0.25rem;
  font-size: 1.35rem;
}
.sub {
  color: var(--muted);
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
}
.health {
  font-size: 0.85rem;
  color: var(--accent);
  min-height: 1.2em;
}
.health.bad {
  color: #ff6b6b;
}

.tabs {
  display: flex;
  gap: 0.35rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}
.tabs button {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.5rem 0.85rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.9rem;
}
.tabs button.active {
  border-color: var(--accent);
  color: var(--accent);
}

.panel {
  display: none;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
}
.panel.active {
  display: block;
}

/* --- Coding / Canvas (Gemini-style split) --- */
.panel-canvas.active {
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
  min-height: min(calc(100vh - 6rem), 920px);
  max-height: calc(100vh - 3.5rem);
}
.canvas-topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(13, 18, 24, 0.6);
}
.canvas-topbar-title {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}
.canvas-badge {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 0.2rem 0.45rem;
  border-radius: 6px;
}
.canvas-model {
  font-size: 0.82rem;
  color: var(--muted);
}
.canvas-topbar-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem 1rem;
}
.canvas-inline {
  margin-top: 0 !important;
  font-size: 0.78rem;
}

.code-system-banner {
  border-bottom: 1px solid var(--border);
  background: rgba(13, 18, 24, 0.85);
}
.code-system-banner > summary {
  cursor: pointer;
  padding: 0.55rem 1rem;
  font-weight: 600;
  font-size: 0.88rem;
}
.code-system-summary-hint {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.8rem;
}
.code-system-banner-body {
  padding: 0 1rem 0.85rem;
}
.code-system-textarea {
  width: 100%;
  min-height: 140px;
  max-height: 360px;
  margin: 0;
  padding: 0.65rem 0.75rem;
  font-family: ui-monospace, SFMono-Regular, monospace;
  font-size: 0.8rem;
  line-height: 1.45;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0a0e14;
  color: var(--text);
  resize: vertical;
}
.code-system-banner-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}
.code-system-banner-actions button {
  margin-top: 0;
}
.codemesh-help {
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--muted);
  margin: 0 0 0.65rem;
}
.codemesh-help code {
  font-size: 0.72rem;
}

.code-canvas-layout {
  display: grid;
  grid-template-columns: minmax(280px, 1fr) minmax(360px, 1.2fr);
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
  border-radius: 0 0 10px 10px;
}
@media (max-width: 960px) {
  .code-canvas-layout {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(0, 44vh) minmax(0, 52vh);
  }
}

.code-canvas-chat {
  display: flex;
  flex-direction: column;
  min-height: 0;
  border-right: 1px solid var(--border);
  background: #0d1218;
}
@media (max-width: 960px) {
  .code-canvas-chat {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
}

.code-thread-tall {
  flex: 1 1 auto;
  min-height: 120px;
  max-height: min(40vh, 480px);
  border-radius: 0;
  border: none;
  margin-top: 0;
  overflow-y: auto;
}

.code-composer {
  padding: 0.75rem 1rem 1rem;
  border-top: 1px solid var(--border);
  background: var(--card);
}
.code-composer textarea {
  margin-top: 0;
}
.code-composer button {
  margin-top: 0.65rem;
}

.code-canvas-side {
  display: flex;
  flex-direction: column;
  min-height: 0;
  background: #080c11;
}

.canvas-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border);
  background: #0a0e14;
}
.canvas-side-title {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--text);
  margin-right: 0.25rem;
}
.canvas-segment {
  display: inline-flex;
  border: 1px solid var(--border);
  border-radius: 999px;
  overflow: hidden;
  background: #0d1218;
}
.canvas-segment-btn {
  margin: 0 !important;
  width: auto !important;
  padding: 0.35rem 0.85rem !important;
  font-size: 0.78rem !important;
  font-weight: 600 !important;
  border: none !important;
  border-radius: 0 !important;
  background: transparent !important;
  color: var(--muted) !important;
  cursor: pointer;
}
.canvas-segment-btn:hover {
  filter: brightness(1.15);
}
.canvas-segment-btn.active {
  background: #1e3a5f !important;
  color: var(--accent) !important;
}
.canvas-toolbar-spacer {
  flex: 1;
  min-width: 0.5rem;
}
.btn-canvas-tool {
  padding: 0.35rem 0.65rem !important;
  font-size: 0.78rem !important;
}

.canvas-body {
  flex: 1 1 auto;
  min-height: 0;
  max-height: min(72vh, 820px);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}
.canvas-pane {
  display: none;
  flex: 1 1 auto;
  flex-direction: column;
  min-height: 0;
  max-height: 100%;
  overflow: hidden;
}
.canvas-pane.active {
  display: flex;
}

.canvas-preview-viewport {
  position: relative;
  flex: 1 1 auto;
  min-height: 200px;
  max-height: min(62vh, 720px);
  width: 100%;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
@media (max-width: 960px) {
  .canvas-preview-viewport {
    max-height: min(48vh, 560px);
  }
}

#codePreviewFrame {
  flex: 1 1 auto;
  width: 100%;
  min-height: 0;
  height: 100%;
  max-height: 100%;
  border: 0;
  background: #0f0f0f;
}

#canvasCodePane.canvas-pane.active {
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

.canvas-empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1.5rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
  pointer-events: none;
}
.canvas-empty[hidden] {
  display: none !important;
}

.code-preview-fill {
  flex: 0 1 auto;
  margin: 0;
  min-height: 0;
  max-height: min(62vh, 720px);
  overflow: auto;
  border-radius: 0;
  border: none;
  border-top: 1px solid var(--border);
}
@media (max-width: 960px) {
  .code-preview-fill {
    max-height: min(48vh, 560px);
  }
}

.canvas-export {
  border-top: 1px solid var(--border);
  padding: 0.35rem 0.75rem 0.65rem;
  font-size: 0.8rem;
  color: var(--muted);
}
.canvas-export summary {
  cursor: pointer;
  color: var(--text);
  font-weight: 500;
}
.canvas-export .codemesh-row label {
  margin-top: 0.5rem;
}
.canvas-export .codemesh-actions {
  margin-top: 0.5rem;
}

.code-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 0.5rem;
  align-items: start;
}
@media (max-width: 900px) {
  .code-split {
    grid-template-columns: 1fr;
  }
}
.code-split-col label:first-child {
  margin-top: 0;
}
.code-preview {
  margin: 0;
  margin-top: 0.35rem;
  padding: 0.75rem;
  min-height: 160px;
  max-height: 420px;
  overflow: auto;
  background: #0a0e14;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-family: ui-monospace, monospace;
  font-size: 0.82rem;
  line-height: 1.4;
  white-space: pre-wrap;
  word-break: break-word;
}
.codemesh-row input[type='url'],
.codemesh-row input[type='text'] {
  margin-top: 0.35rem;
}
.codemesh-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.5rem;
}
.codemesh-actions button {
  margin-top: 0;
  width: auto;
}
.code-toolbar {
  margin-top: 0.5rem;
}

label {
  display: block;
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--muted);
}
label.inline {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
}
select,
textarea,
button {
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.5rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #0d1218;
  color: var(--text);
  font: inherit;
}
select {
  max-width: 100%;
}
button {
  margin-top: 1rem;
  background: linear-gradient(180deg, #2a5080, #1e3a5f);
  border-color: #3d6dad;
  cursor: pointer;
  font-weight: 600;
}
button:hover {
  filter: brightness(1.08);
}
button.btn-secondary {
  width: auto;
  display: inline-block;
  margin-top: 0;
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 500;
  background: #2a3544;
  border-color: var(--border);
}
.chat-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.75rem;
}
.chat-hint {
  font-size: 0.75rem;
  color: var(--muted);
  flex: 1;
  min-width: 200px;
}
.chat-thread {
  margin-top: 0.5rem;
  min-height: 120px;
  max-height: 420px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  padding: 0.75rem;
  background: #0d1218;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.chat-msg {
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  max-width: 94%;
  font-size: 0.9rem;
  line-height: 1.45;
  white-space: pre-wrap;
  word-break: break-word;
}
.chat-msg-user {
  align-self: flex-end;
  background: #1a3352;
  border: 1px solid #3d6dad;
}
.chat-msg-assistant {
  align-self: flex-start;
  background: #121a24;
  border: 1px solid var(--border);
}
.chat-msg-meta {
  font-size: 0.7rem;
  color: var(--muted);
  margin-bottom: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.chat-msg-loading {
  color: var(--muted);
  font-style: italic;
}
.hint {
  font-size: 0.8rem;
  color: var(--muted);
  margin: 0.5rem 0 0;
}

.out {
  margin-top: 1rem;
  padding: 0.75rem;
  background: #0d1218;
  border-radius: 6px;
  border: 1px solid var(--border);
  white-space: pre-wrap;
  word-break: break-word;
  font-size: 0.85rem;
  max-height: 420px;
  overflow: auto;
}

.preview {
  margin-top: 1rem;
}
.preview img,
.preview video {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
}
.preview-item {
  display: inline-block;
  vertical-align: top;
  margin: 0 0.75rem 0.75rem 0;
  max-width: 100%;
}
.preview-actions {
  margin-top: 0.4rem;
}
.preview-actions button,
.preview-item button.btn-small {
  width: auto;
  margin-top: 0;
  display: inline-block;
}

.grounding-box {
  margin-top: 0.75rem;
  padding: 0.65rem 0.75rem;
  font-size: 0.8rem;
  background: #0d1218;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
}
.grounding-box[hidden] {
  display: none !important;
}
.grounding-title {
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.35rem;
}
.grounding-queries {
  margin-bottom: 0.5rem;
  font-size: 0.78rem;
}
.grounding-sources {
  margin: 0;
  padding-left: 1.1rem;
}
.grounding-sources a {
  color: var(--accent);
}
.chat-msg .grounding-box {
  margin-top: 0.6rem;
  max-width: 100%;
}

code {
  background: #0d1218;
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-size: 0.88em;
}