:root {
  --app-bg: #f7f8fb;
  --nav-bg: #f2f4f8;
  --surface: #ffffff;
  --surface-soft: #f7f9fd;
  --surface-hover: #eef4ff;
  --line: #e4e8f0;
  --line-strong: #cfd7e6;
  --text: #141820;
  --muted: #667085;
  --muted-2: #98a2b3;
  --accent: #2563eb;
  --accent-strong: #174fd2;
  --accent-soft: #e9f1ff;
  --green: #159a74;
  --green-soft: #e6f7f1;
  --amber: #b7791f;
  --amber-soft: #fff4da;
  --danger: #d64550;
  --danger-soft: #ffe9ec;
  --shadow: 0 18px 48px rgba(34, 50, 84, 0.12);
  --nav-width: 272px;
  --inspector-width: 360px;
  --radius: 8px;
  --composer-radius: 22px;
}

html[data-theme="dark"] {
  --app-bg: #111318;
  --nav-bg: #171a21;
  --surface: #1d212a;
  --surface-soft: #151922;
  --surface-hover: #202a3a;
  --line: #2b313d;
  --line-strong: #3a4352;
  --text: #f3f6fb;
  --muted: #adb7c8;
  --muted-2: #758195;
  --accent: #74a7ff;
  --accent-strong: #9cc0ff;
  --accent-soft: rgba(116, 167, 255, 0.14);
  --green: #7bd4ac;
  --green-soft: rgba(123, 212, 172, 0.12);
  --amber: #f0c46b;
  --amber-soft: rgba(240, 196, 107, 0.12);
  --danger: #ff7c89;
  --danger-soft: rgba(255, 124, 137, 0.12);
  --shadow: 0 22px 54px rgba(0, 0, 0, 0.26);
}

html[data-theme="blue"] {
  --app-bg: #eef6ff;
  --nav-bg: #e7f0fb;
  --surface: #fbfdff;
  --surface-soft: #f1f7ff;
  --surface-hover: #e4f0ff;
  --line: #d5e4f7;
  --line-strong: #aac5e8;
  --text: #102033;
  --muted: #52687f;
  --muted-2: #7d91a7;
  --accent: #0f78d4;
  --accent-strong: #075faf;
  --accent-soft: #e0f0ff;
  --green: #0b9272;
  --green-soft: #e3f7f0;
  --amber: #a76813;
  --amber-soft: #fff3d4;
  --danger: #c93f4d;
  --danger-soft: #ffe8eb;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
}

body {
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(255, 255, 255, 0)),
    var(--app-bg);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
  overflow: hidden;
}

button,
input,
textarea {
  font: inherit;
}

button {
  border: 0;
  cursor: pointer;
}

textarea,
input {
  color: var(--text);
}

.hidden {
  display: none !important;
}

.app-shell {
  display: grid;
  grid-template-columns: var(--nav-width) minmax(0, 1fr) var(--inspector-width);
  height: 100vh;
  min-height: 0;
  transition: grid-template-columns 0.2s ease;
}

.nav-panel {
  display: grid;
  grid-template-rows: auto auto auto minmax(0, 1fr) auto;
  gap: 14px;
  min-height: 0;
  padding: 18px 14px;
  background: var(--nav-bg);
  border-right: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 4px 8px;
}

.brand-logo {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 0 0 1px var(--line);
  background: var(--surface);
}

.brand-copy {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.brand-copy strong {
  font-size: 17px;
  line-height: 1.2;
}

.brand-copy span,
.section-kicker {
  color: var(--muted);
  font-size: 12px;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 9px;
  height: 42px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted-2);
}

.search-box input {
  min-width: 0;
  width: 100%;
  border: 0;
  outline: 0;
  background: transparent;
}

.nav-actions {
  display: grid;
  gap: 6px;
}

.nav-action,
.soft-button,
.tool-button,
.mini-button,
.plan-chip,
.icon-button,
.send-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 36px;
  border-radius: 8px;
  color: var(--text);
  background: transparent;
  transition: background 0.15s ease, color 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}

.nav-action {
  justify-content: flex-start;
  padding: 10px 12px;
  font-weight: 650;
}

.nav-action:hover,
.soft-button:hover,
.tool-button:hover,
.mini-button:hover,
.plan-chip:hover,
.icon-button:hover {
  background: var(--surface-hover);
}

.primary-action {
  background: var(--surface);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02);
}

.history-section {
  min-height: 0;
  overflow: hidden;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: 8px;
}

.history-list {
  display: grid;
  align-content: start;
  gap: 4px;
  min-height: 0;
  overflow: auto;
  padding-right: 2px;
}

.history-item {
  display: grid;
  gap: 5px;
  width: 100%;
  padding: 10px 11px;
  border-radius: 8px;
  text-align: left;
  color: var(--text);
  background: transparent;
}

.history-item:hover,
.history-item.active {
  background: var(--surface);
}

.history-item strong,
.history-item span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.history-item strong {
  font-size: 13px;
}

.history-item span {
  color: var(--muted);
  font-size: 12px;
}

.empty-history {
  display: grid;
  gap: 4px;
  padding: 12px;
  color: var(--muted);
  background: var(--surface);
  border-radius: 8px;
}

.empty-history strong {
  color: var(--text);
}

.plan-dock {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.plan-dock div {
  display: grid;
  gap: 3px;
}

.chat-workspace {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  background:
    linear-gradient(180deg, var(--surface) 0%, var(--surface) 62%, var(--app-bg) 100%);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 72px;
  padding: 14px 28px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(18px);
}

.header-title {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.eyebrow {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
}

.app-header h1 {
  margin: 2px 0 0;
  font-size: 18px;
  line-height: 1.25;
}

.header-actions,
.composer-tools,
.message-actions,
.subscription-dock,
.tag-cloud {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.soft-button,
.tool-button,
.mini-button,
.plan-chip {
  border: 1px solid var(--line);
  background: var(--surface-soft);
  padding: 8px 11px;
  font-size: 13px;
  font-weight: 650;
}

.status-button.connected {
  border-color: color-mix(in srgb, var(--green) 35%, var(--line));
  color: var(--green);
  background: var(--green-soft);
}

.status-button.warning {
  border-color: color-mix(in srgb, var(--amber) 42%, var(--line));
  color: var(--amber);
  background: var(--amber-soft);
}

.icon-button,
.send-button {
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  background: var(--surface-soft);
}

.send-button {
  border-color: var(--accent);
  color: #ffffff;
  background: var(--accent);
}

.send-button:hover {
  background: var(--accent-strong);
}

.icon {
  display: inline-flex;
  width: 17px;
  height: 17px;
  align-items: center;
  justify-content: center;
  color: currentColor;
}

.icon svg {
  width: 17px;
  height: 17px;
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card-head strong {
  display: block;
  font-size: 13px;
}

.chat-panel {
  min-height: 0;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto auto;
  padding: 8px 0 22px;
}

.chat-status {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding: 6px 26px;
  color: var(--muted);
  font-size: 12px;
}

.chat-status span {
  padding: 5px 9px;
  border-radius: 999px;
  background: var(--surface-soft);
}

.messages {
  min-height: 0;
  overflow: auto;
  padding: 18px max(28px, calc((100% - 880px) / 2)) 16px;
}

.welcome-panel {
  min-height: 100%;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 16px;
  text-align: center;
}

.welcome-mark {
  display: grid;
  justify-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.welcome-mark img {
  width: 68px;
  height: 68px;
  object-fit: cover;
  border-radius: 16px;
  box-shadow: 0 0 0 1px var(--line), var(--shadow);
}

.welcome-panel h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.2;
}

.welcome-panel p {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.welcome-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  width: min(820px, 100%);
}

.welcome-feature-grid button {
  display: grid;
  gap: 6px;
  min-height: 112px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  text-align: left;
  color: var(--text);
  background: var(--surface);
  box-shadow: 0 10px 30px rgba(34, 50, 84, 0.08);
}

.welcome-feature-grid button:hover {
  border-color: color-mix(in srgb, var(--accent) 38%, var(--line));
  background: var(--surface-hover);
}

.welcome-feature-grid strong {
  font-size: 14px;
}

.welcome-feature-grid span {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.welcome-prompts {
  display: flex;
  justify-content: center;
  gap: 10px;
  flex-wrap: wrap;
  max-width: 720px;
}

.welcome-prompts button,
.quick-actions button {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  padding: 10px 14px;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02);
}

.welcome-prompts button:hover,
.quick-actions button:hover {
  border-color: var(--line-strong);
  background: var(--surface-hover);
}

.message-row {
  display: flex;
  gap: 12px;
  margin: 0 auto 20px;
  max-width: 880px;
}

.message-row.user {
  justify-content: flex-end;
}

.message-avatar {
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: 50%;
  color: #ffffff;
  background: var(--accent);
  font-size: 12px;
  font-weight: 800;
}

.message-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.message-row.user .message-avatar {
  order: 2;
  background: var(--green);
}

.message-body-wrap {
  display: grid;
  gap: 8px;
  min-width: 0;
  max-width: min(800px, 82%);
}

.message-row.user .message-body-wrap {
  justify-items: end;
}

.message-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 12px;
}

.message-meta strong {
  color: var(--text);
}

.message-bubble {
  width: fit-content;
  max-width: 100%;
  padding: 2px 0;
  border-radius: 0;
  background: transparent;
  line-height: 1.72;
  word-break: break-word;
  white-space: normal;
  box-shadow: none;
}

.message-block {
  margin: 0 0 10px;
}

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

.message-table-wrap {
  max-width: 100%;
  margin: 10px 0;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.message-table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  font-size: 12px;
  line-height: 1.5;
}

.message-table th,
.message-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.message-table th {
  color: var(--text);
  background: var(--surface-soft);
  font-weight: 750;
}

.message-table tr:last-child td {
  border-bottom: 0;
}

.message-table code,
.message-block code {
  padding: 1px 5px;
  border-radius: 6px;
  color: var(--accent);
  background: var(--accent-soft);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.message-row.user .message-bubble {
  color: #ffffff;
  background: var(--accent);
  padding: 11px 14px;
  border-radius: 18px 18px 4px 18px;
  box-shadow: none;
  white-space: pre-wrap;
}

.message-row.pending .message-bubble {
  color: var(--muted);
}

.result-card {
  max-width: 100%;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 8px 22px rgba(34, 50, 84, 0.06);
}

.mini-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.mini-tile {
  display: grid;
  gap: 4px;
  min-width: 0;
  padding: 10px;
  border-radius: 8px;
  background: var(--surface-soft);
}

.mini-tile span,
.model-item span,
.anomaly-item span,
.card-head span,
.subscription-card p,
.workflow-step p,
.scenario-item p,
.graph-canvas p,
.report-preview p,
.report-preview li {
  color: var(--muted);
}

.mini-tile strong {
  overflow-wrap: anywhere;
  font-size: 13px;
}

.mini-formula,
.model-equation,
.report-formula {
  display: block;
  max-width: 100%;
  overflow-x: auto;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--accent);
  background: var(--surface-soft);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  line-height: 1.55;
  white-space: nowrap;
}

.message-actions {
  margin-top: 2px;
}

.report-card {
  display: grid;
  gap: 8px;
}

.report-card ul {
  margin: 0;
  padding-left: 18px;
}

.report-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.quick-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  width: min(880px, calc(100% - 52px));
  margin: 0 auto 12px;
}

.quick-actions button {
  font-size: 13px;
}

.composer {
  display: grid;
  gap: 10px;
  width: min(880px, calc(100% - 52px));
  margin: 0 auto;
  padding: 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--composer-radius);
  background: var(--surface);
  box-shadow: 0 18px 50px rgba(34, 50, 84, 0.14);
}

.composer textarea {
  width: 100%;
  min-height: 28px;
  max-height: 160px;
  resize: none;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  line-height: 1.65;
}

.composer-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.inspector-panel {
  min-width: 0;
  min-height: 0;
  overflow: auto;
  display: grid;
  align-content: start;
  gap: 12px;
  padding: 16px;
  border-left: 1px solid var(--line);
  background: color-mix(in srgb, var(--surface-soft) 92%, var(--surface));
  transition: opacity 0.2s ease, transform 0.2s ease;
}

body.inspector-closed .app-shell {
  grid-template-columns: var(--nav-width) minmax(0, 1fr) 0;
}

body.inspector-closed .inspector-panel {
  overflow: hidden;
  opacity: 0;
  padding-left: 0;
  padding-right: 0;
  transform: translateX(24px);
}

.inspector-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 3px 2px;
}

.inspector-head div {
  display: grid;
  gap: 3px;
}

.inspector-tabs {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.inspector-tabs button {
  display: inline-flex;
  min-width: 0;
  min-height: 34px;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: 7px;
  color: var(--muted);
  background: transparent;
  font-size: 12px;
  font-weight: 750;
}

.inspector-tabs button.active {
  color: var(--accent);
  background: var(--accent-soft);
}

.inspector-view {
  display: none;
}

.inspector-view.active {
  display: grid;
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.metric,
.inspector-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.metric {
  display: grid;
  gap: 5px;
  min-width: 0;
  padding: 11px;
}

.metric span {
  color: var(--muted);
  font-size: 12px;
}

.metric strong {
  overflow-wrap: anywhere;
  font-size: 17px;
}

.inspector-card {
  display: grid;
  gap: 10px;
  padding: 12px;
}

.inspector-panel .inspector-view {
  display: none;
}

.inspector-panel .inspector-view.active {
  display: grid;
}

.card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.card-head span {
  font-size: 12px;
}

.dataset-card textarea {
  min-height: 180px;
}

.inspector-card textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 8px;
  outline: 0;
  padding: 10px;
  background: var(--surface-soft);
  line-height: 1.55;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 12px;
}

.inspector-card textarea:focus {
  border-color: var(--accent);
}

.chart {
  min-height: 230px;
  overflow: hidden;
  border-radius: 8px;
  background: var(--surface-soft);
}

.chart svg {
  width: 100%;
  height: 230px;
  display: block;
}

.chart text {
  fill: var(--muted);
  font-size: 11px;
}

.chart-grid {
  stroke: var(--line);
  stroke-width: 1;
}

.chart-grid.subtle {
  opacity: 0.7;
}

.chart-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 3;
}

.chart-point {
  fill: var(--green);
  stroke: var(--surface);
  stroke-width: 2;
}

.chart-label {
  font-weight: 700;
}

.model-grid,
.physics-list,
.anomaly-list,
.workflow-list,
.scenario-list,
.subscription-cards {
  display: grid;
  gap: 8px;
}

.model-item,
.physics-item,
.anomaly-item,
.workflow-step,
.scenario-item,
.subscription-card {
  border-radius: 8px;
  background: var(--surface-soft);
}

.model-item {
  display: grid;
  gap: 10px;
  padding: 11px;
  border: 1px solid transparent;
}

.model-item.selected {
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  background: var(--accent-soft);
}

.model-main,
.model-score,
.subscription-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.model-main {
  justify-content: flex-start;
}

.model-main div {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.model-main span:not(.rank-badge),
.model-score span,
.model-stats,
.model-item p {
  font-size: 12px;
}

.rank-badge {
  display: inline-grid;
  place-items: center;
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  border-radius: 8px;
  color: var(--accent);
  background: var(--surface);
  font-size: 12px;
  font-weight: 800;
}

.model-score strong {
  color: var(--green);
}

.model-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  color: var(--muted);
}

.model-stats span {
  padding: 4px 7px;
  border-radius: 999px;
  background: var(--surface);
}

.model-item p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.physics-item,
.anomaly-item,
.workflow-step,
.scenario-item {
  padding: 10px;
}

.physics-item {
  border-left: 3px solid var(--green);
}

.physics-item.high,
.physics-item.critical {
  border-left-color: var(--danger);
  background: var(--danger-soft);
}

.physics-item.medium {
  border-left-color: var(--amber);
  background: var(--amber-soft);
}

.physics-item p,
.anomaly-item p,
.workflow-step p,
.scenario-item p {
  margin: 5px 0 0;
  font-size: 12px;
  line-height: 1.55;
}

.anomaly-item {
  border-left: 3px solid var(--amber);
}

.anomaly-item.high {
  border-left-color: var(--danger);
  background: var(--danger-soft);
}

.anomaly-item.stable {
  border-left-color: var(--green);
  background: var(--green-soft);
}

.report-preview {
  display: grid;
  gap: 8px;
  line-height: 1.65;
}

.report-preview h3,
.report-preview h4,
.report-preview p,
.report-preview ul,
.report-preview ol {
  margin: 0;
}

.report-preview h3 {
  font-size: 16px;
}

.report-preview h4 {
  margin-top: 4px;
  font-size: 13px;
}

.report-preview ul,
.report-preview ol {
  padding-left: 19px;
}

.report-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

.report-metrics span {
  padding: 5px 8px;
  border-radius: 999px;
  color: var(--accent);
  background: var(--accent-soft);
  font-size: 12px;
}

.plan-chip {
  min-height: 32px;
  padding: 7px 10px;
  font-size: 12px;
}

.plan-chip.active,
.mini-button:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.block-button {
  width: 100%;
}

.subscription-card {
  display: grid;
  gap: 8px;
  padding: 10px;
}

.subscription-card.active {
  box-shadow: inset 0 0 0 1px var(--accent);
}

.subscription-card p {
  margin: 0;
  font-size: 12px;
  line-height: 1.55;
}

.tag-cloud span {
  padding: 6px 9px;
  border-radius: 999px;
  color: var(--accent);
  background: var(--accent-soft);
  font-size: 12px;
}

.graph-canvas {
  display: grid;
  gap: 8px;
}

.graph-canvas svg {
  width: 100%;
  height: 220px;
  display: block;
  border-radius: 8px;
  background: var(--surface-soft);
}

.graph-canvas line {
  stroke: color-mix(in srgb, var(--accent) 42%, transparent);
  stroke-width: 2;
}

.graph-node circle {
  fill: var(--surface);
  stroke: var(--line-strong);
  stroke-width: 1.2;
}

.graph-node.core circle {
  fill: var(--accent-soft);
  stroke: var(--accent);
}

.graph-node.result circle {
  fill: var(--green-soft);
  stroke: var(--green);
}

.graph-node.signal circle {
  fill: var(--amber-soft);
  stroke: var(--amber);
}

.graph-node text {
  fill: var(--muted);
  font-size: 10px;
}

.graph-node.core text,
.graph-node.result text {
  font-weight: 800;
}

.empty-note {
  display: grid;
  min-height: 96px;
  place-items: center;
  color: var(--muted);
  border-radius: 8px;
  background: var(--surface-soft);
  font-size: 13px;
}

.report-modal {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(17, 24, 39, 0.48);
  backdrop-filter: blur(10px);
}

.report-modal-panel {
  display: grid;
  gap: 14px;
  width: min(960px, 100%);
  max-height: 88vh;
  overflow: auto;
  padding: 18px;
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.modal-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 50;
  max-width: 360px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  background: var(--surface);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.mobile-only {
  display: none;
}

@media (max-width: 1380px) {
  :root {
    --nav-width: 260px;
    --inspector-width: 370px;
  }
}

@media (max-width: 1180px) {
  .app-shell {
    grid-template-columns: var(--nav-width) minmax(0, 1fr);
  }

  .inspector-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 30;
    width: min(var(--inspector-width), 92vw);
    transform: translateX(105%);
    box-shadow: var(--shadow);
  }

  body.inspector-open .inspector-panel {
    transform: translateX(0);
    opacity: 1;
  }

  body.inspector-closed .app-shell {
    grid-template-columns: var(--nav-width) minmax(0, 1fr);
  }

  body.inspector-closed .inspector-panel {
    padding: 16px;
    transform: translateX(105%);
  }

  .mobile-only {
    display: inline-flex;
  }
}

@media (max-width: 900px) {
  body {
    overflow: auto;
  }

  .app-shell {
    grid-template-columns: 1fr;
    min-height: 100vh;
    height: auto;
  }

  .nav-panel {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 35;
    width: min(var(--nav-width), 88vw);
    transform: translateX(-105%);
    transition: transform 0.2s ease;
    box-shadow: var(--shadow);
  }

  body.nav-open .nav-panel {
    transform: translateX(0);
  }

  .chat-workspace {
    min-height: 100vh;
  }

  .app-header {
    padding-left: 16px;
    padding-right: 16px;
  }

  .welcome-feature-grid,
  .metrics-grid,
  .mini-grid {
    grid-template-columns: 1fr;
  }

  .header-actions {
    justify-content: flex-end;
  }

  .messages {
    padding-left: 16px;
    padding-right: 16px;
  }

  .message-body-wrap {
    max-width: calc(100% - 46px);
  }

  .quick-actions,
  .composer {
    width: calc(100% - 32px);
  }
}

@media (max-width: 620px) {
  .app-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .header-actions,
  .composer-toolbar {
    width: 100%;
    justify-content: space-between;
  }

  .composer-tools {
    max-width: calc(100% - 50px);
    overflow-x: auto;
    flex-wrap: nowrap;
  }

  .welcome-panel {
    align-content: start;
    padding-top: 44px;
  }
}