styles.css

:root {
  color-scheme: dark;
  --bg: #0b0e10;
  --surface: #101416;
  --surface-raised: #151a1d;
  --surface-soft: #191f22;
  --line: rgba(221, 229, 226, 0.12);
  --line-strong: rgba(221, 229, 226, 0.22);
  --text: #edf0eb;
  --muted: #8b9694;
  --muted-strong: #b3bcba;
  --accent: #ddbd79;
  --accent-soft: rgba(221, 189, 121, 0.12);
  --danger: #d5796f;
  --danger-soft: rgba(213, 121, 111, 0.12);
  --sidebar-width: 292px;
  --inspector-width: 356px;
  --topbar-height: 64px;
  font-family: "Segoe UI", "Microsoft YaHei UI", "PingFang SC", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
  background: var(--bg);
  color: var(--text);
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

button:focus-visible,
input:focus-visible,
.graph-viewport:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.topbar {
  position: relative;
  z-index: 30;
  height: var(--topbar-height);
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(190px, 1fr) minmax(280px, 430px) minmax(210px, var(--inspector-width));
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: rgba(11, 14, 16, 0.96);
}

.brand {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 0 22px;
  border-right: 1px solid var(--line);
}

.brand-mark {
  width: 25px;
  height: 27px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  align-items: end;
  gap: 2px;
  border-bottom: 1px solid var(--accent);
  padding-bottom: 3px;
}

.brand-mark i {
  display: block;
  width: 100%;
  background: var(--accent);
  opacity: 0.92;
}

.brand-mark i:nth-child(1) { height: 7px; }
.brand-mark i:nth-child(2) { height: 12px; }
.brand-mark i:nth-child(3) { height: 18px; }
.brand-mark i:nth-child(4) { height: 23px; }

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.brand-copy strong {
  font-family: "Microsoft YaHei UI", "PingFang SC", sans-serif;
  font-size: 15px;
  letter-spacing: 0.14em;
}

.brand-copy small {
  margin-top: 6px;
  color: var(--muted);
  font-size: 8px;
  letter-spacing: 0.16em;
}

.topbar-context {
  min-width: 0;
  padding: 0 24px;
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.topbar-context span {
  color: var(--muted);
  font-size: 11px;
}

.topbar-context strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 13px;
  font-weight: 550;
}

.mode-switch {
  height: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: stretch;
  border-right: 1px solid var(--line);
}

.mode-button {
  position: relative;
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 4px;
  padding: 0 15px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  text-align: left;
  cursor: pointer;
}

.mode-button:last-child {
  border-right: 0;
}

.mode-button::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: -1px;
  height: 1px;
  background: transparent;
  transition: background 180ms ease, box-shadow 180ms ease;
}

.mode-button span {
  color: inherit;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.mode-button small {
  color: #58625f;
  font-size: 8px;
  letter-spacing: 0.05em;
}

.mode-button:hover,
.mode-button.is-active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.018);
}

.mode-button.is-active::after {
  background: var(--accent);
  box-shadow: 0 0 11px rgba(221, 189, 121, 0.4);
}

.search-box {
  position: relative;
  height: 36px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 10px;
  border: 1px solid var(--line);
  background: var(--surface);
}

.search-box > svg {
  width: 16px;
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.6;
}

.search-box input {
  min-width: 0;
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-size: 12px;
}

.search-box input::placeholder {
  color: #65706e;
}

kbd {
  padding: 3px 5px;
  border: 1px solid var(--line);
  color: var(--muted);
  font: 9px/1 "Segoe UI", sans-serif;
}

.search-results {
  position: absolute;
  top: 42px;
  left: 0;
  right: 0;
  z-index: 50;
  max-height: 320px;
  overflow: auto;
  border: 1px solid var(--line-strong);
  background: #121719;
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.44);
}

.search-result {
  width: 100%;
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 10px;
  padding: 11px 12px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.search-result:hover {
  background: var(--accent-soft);
}

.search-result small {
  color: var(--accent);
  font-size: 9px;
  letter-spacing: 0.08em;
}

.search-result strong {
  font-size: 12px;
  font-weight: 550;
}

.topbar-actions {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 0 18px;
}

.icon-button,
.quiet-button {
  height: 34px;
  border: 1px solid var(--line);
  background: transparent;
  cursor: pointer;
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease;
}

.quiet-button {
  padding: 0 13px;
  color: var(--muted-strong);
  font-size: 11px;
}

.icon-button {
  width: 34px;
  display: grid;
  place-items: center;
}

.icon-button svg {
  width: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
}

.icon-button:hover,
.quiet-button:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.app-layout {
  height: calc(100svh - var(--topbar-height));
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr) var(--inspector-width);
}

.sidebar,
.inspector {
  min-height: 0;
  background: var(--surface);
}

.sidebar {
  overflow-y: auto;
  border-right: 1px solid var(--line);
}

.sidebar-section {
  padding: 22px;
  border-bottom: 1px solid var(--line);
}

.atlas-scope-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--line);
}

.atlas-scope-switch button {
  position: relative;
  min-height: 58px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 4px;
  padding: 0 18px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  text-align: left;
  cursor: pointer;
}

.atlas-scope-switch button:last-child {
  border-right: 0;
}

.atlas-scope-switch button::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: -1px;
  height: 1px;
  background: transparent;
}

.atlas-scope-switch span {
  color: currentColor;
  font-size: 10px;
  font-weight: 620;
}

.atlas-scope-switch small {
  color: #58625f;
  font-size: 8px;
}

.atlas-scope-switch button:hover,
.atlas-scope-switch button.is-active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.018);
}

.atlas-scope-switch button.is-active::after {
  background: var(--accent);
  box-shadow: 0 0 10px rgba(221, 189, 121, 0.35);
}

.context-section {
  padding-top: 27px;
}

.eyebrow {
  margin: 0 0 7px;
  color: var(--accent);
  font-size: 9px;
  font-weight: 650;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.context-section h1 {
  margin: 0;
  font-size: 25px;
  font-weight: 520;
  letter-spacing: 0.02em;
}

.context-section > p:not(.eyebrow),
.section-note {
  color: var(--muted);
  font-size: 11px;
  line-height: 1.75;
}

.context-section > p:not(.eyebrow) {
  margin: 12px 0 18px;
}

.context-meta {
  display: flex;
  gap: 20px;
  color: var(--muted);
  font-size: 10px;
}

.context-meta b {
  margin-right: 3px;
  color: var(--text);
  font-size: 15px;
  font-weight: 520;
}

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}

.section-heading h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 560;
}

.text-button {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 10px;
  cursor: pointer;
}

.text-button:hover {
  color: var(--accent);
}

.section-note {
  margin: 10px 0 14px;
}

.axiom-list,
.filter-list {
  display: flex;
  flex-direction: column;
}

.axiom-row,
.filter-row {
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--line);
}

.axiom-row:first-child,
.filter-row:first-child {
  border-top: 0;
}

.axiom-row span,
.filter-row span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--muted-strong);
  font-size: 11px;
}

.switch {
  position: relative;
  width: 30px;
  height: 17px;
  flex: 0 0 auto;
  padding: 0;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  background: #242b2d;
  cursor: pointer;
  transition: background 180ms ease, border-color 180ms ease;
}

.switch::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--muted);
  transition: transform 180ms ease, background 180ms ease;
}

.switch[aria-checked="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.switch[aria-checked="true"]::after {
  transform: translateX(13px);
  background: var(--accent);
}

.filter-button {
  width: 19px;
  height: 19px;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  padding: 0;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: transparent;
  cursor: pointer;
}

.filter-button::after {
  content: "";
  width: 8px;
  height: 4px;
  border-left: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-1px) rotate(-45deg);
}

.filter-button[aria-checked="true"] {
  border-color: var(--accent);
  background: var(--accent);
  color: #17130b;
}

.integrity-section {
  border-bottom: 0;
}

.integrity-row {
  display: grid;
  grid-template-columns: 10px 1fr;
  gap: 11px;
  align-items: start;
}

.integrity-light {
  width: 7px;
  height: 7px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(221, 189, 121, 0.55);
}

.integrity-row strong {
  font-size: 11px;
  font-weight: 570;
}

.integrity-row p {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.55;
}

.integrity-section.is-broken .integrity-light {
  background: var(--danger);
  box-shadow: 0 0 12px rgba(213, 121, 111, 0.5);
}

.workspace {
  min-width: 0;
  min-height: 0;
  display: grid;
  grid-template-rows: 58px minmax(0, 1fr);
  background: var(--bg);
}

.workspace-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 20px;
  border-bottom: 1px solid var(--line);
}

.workspace-heading h2 {
  margin: 0;
  font-size: 13px;
  font-weight: 540;
}

.legend {
  display: flex;
  align-items: center;
  gap: 17px;
  color: var(--muted);
  font-size: 9px;
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.legend-line {
  width: 18px;
  height: 1px;
  background: var(--accent);
}

.legend-node {
  width: 9px;
  height: 9px;
  border: 1px solid var(--accent);
  background: var(--accent-soft);
}

.legend-node.unavailable {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.graph-viewport {
  position: relative;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  cursor: grab;
  touch-action: none;
  background-color: #0b0e10;
  background-image: radial-gradient(rgba(213, 223, 219, 0.14) 0.65px, transparent 0.65px);
  background-size: 20px 20px;
}

.graph-viewport.is-dragging {
  cursor: grabbing;
}

.graph-world {
  position: absolute;
  left: 0;
  top: 0;
  width: 1780px;
  height: 1040px;
  transform-origin: 0 0;
  will-change: transform;
}

.floor-layer,
.edge-layer,
.node-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.floor-line {
  position: absolute;
  left: 35px;
  right: 35px;
  border-top: 1px solid rgba(221, 229, 226, 0.085);
}

.floor-line span {
  position: absolute;
  left: 0;
  top: -23px;
  color: #56605e;
  font-size: 10px;
  letter-spacing: 0.12em;
}

.edge-path {
  fill: none;
  stroke: rgba(185, 197, 193, 0.23);
  stroke-width: 1.3;
  vector-effect: non-scaling-stroke;
  transition: stroke 220ms ease, opacity 220ms ease, stroke-width 220ms ease;
}

.edge-path.is-related {
  stroke: var(--accent);
  stroke-width: 1.7;
  opacity: 0.94;
}

.edge-path.is-dimmed {
  opacity: 0.08;
}

.edge-path.is-invalid {
  stroke: var(--danger);
  stroke-dasharray: 5 6;
  opacity: 0.28;
}

.knowledge-node {
  --delay: 0ms;
  position: absolute;
  width: 188px;
  min-height: 78px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  gap: 7px;
  padding: 12px 13px 11px;
  border: 1px solid rgba(221, 229, 226, 0.2);
  border-radius: 0;
  background: rgba(18, 23, 25, 0.96);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.16);
  opacity: 0;
  animation: node-arrive 540ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
  animation-delay: var(--delay);
  transition: opacity 220ms ease, border-color 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

@keyframes node-arrive {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.knowledge-node:hover {
  border-color: rgba(221, 189, 121, 0.65);
  background: #171d1f;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.28);
  z-index: 2;
}

.knowledge-node.is-selected {
  border-color: var(--accent);
  background: #1b1c18;
  box-shadow: 0 0 0 1px rgba(221, 189, 121, 0.18), 0 18px 44px rgba(0, 0, 0, 0.34);
  z-index: 3;
}

.knowledge-node.is-related:not(.is-selected) {
  border-color: rgba(221, 189, 121, 0.45);
}

.knowledge-node.is-dimmed {
  opacity: 0.2 !important;
}

.knowledge-node.is-hidden {
  opacity: 0 !important;
  pointer-events: none;
}

.knowledge-node.is-invalid {
  border-color: rgba(213, 121, 111, 0.52);
  background:
    repeating-linear-gradient(-45deg, rgba(213, 121, 111, 0.035) 0 5px, transparent 5px 10px),
    rgba(18, 23, 25, 0.95);
}

.knowledge-node.is-invalid .node-title {
  color: #a99895;
}

.knowledge-node.is-disabled-root {
  border-style: dashed;
}

.node-topline {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.node-code,
.node-type {
  font-size: 8px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.node-code {
  color: var(--accent);
}

.node-type {
  color: #66716f;
}

.node-title {
  font-size: 12px;
  font-weight: 550;
  line-height: 1.42;
}

.node-foot {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #66716f;
  font-size: 8px;
}

.node-foot .support-count {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.node-foot .support-count::before {
  content: "";
  width: 10px;
  height: 1px;
  background: currentColor;
}

.knowledge-node.is-invalid .node-code,
.knowledge-node.is-invalid .node-foot {
  color: var(--danger);
}

.canvas-vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  box-shadow: inset 0 0 90px rgba(0, 0, 0, 0.45);
}

.canvas-controls {
  position: absolute;
  right: 16px;
  bottom: 16px;
  height: 32px;
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
  background: rgba(15, 19, 21, 0.9);
  backdrop-filter: blur(10px);
}

.canvas-controls button {
  width: 32px;
  height: 100%;
  border: 0;
  background: transparent;
  color: var(--muted-strong);
  cursor: pointer;
}

.canvas-controls button:hover {
  color: var(--accent);
}

.canvas-controls output {
  width: 48px;
  color: var(--muted);
  font-size: 9px;
  text-align: center;
}

.canvas-hint {
  position: absolute;
  left: 17px;
  bottom: 9px;
  margin: 0;
  color: #5b6563;
  font-size: 9px;
  letter-spacing: 0.05em;
  pointer-events: none;
}

.inspector {
  position: relative;
  overflow: hidden;
  border-left: 1px solid var(--line);
}

.inspector-scroll {
  height: 100%;
  overflow-y: auto;
  padding: 26px 25px 32px;
}

.inspector-kicker {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 27px;
  color: var(--muted);
  font-size: 9px;
  letter-spacing: 0.11em;
}

.status-badge {
  padding: 4px 7px;
  border: 1px solid var(--line);
  color: var(--muted-strong);
  letter-spacing: 0;
}

.status-badge.is-invalid {
  border-color: rgba(213, 121, 111, 0.4);
  background: var(--danger-soft);
  color: var(--danger);
}

.inspector h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 520;
  line-height: 1.35;
  letter-spacing: 0.01em;
}

.claim {
  margin: 15px 0 0;
  color: var(--muted-strong);
  font-family: "STSong", "Songti SC", "SimSun", serif;
  font-size: 15px;
  line-height: 1.85;
}

.inspector-divider {
  height: 1px;
  margin: 26px 0 22px;
  background: var(--line);
}

.inspector-section {
  margin-top: 25px;
}

.detail-label {
  margin-bottom: 10px;
  color: var(--muted);
  font-size: 9px;
  font-weight: 650;
  letter-spacing: 0.13em;
}

.inspector-section > p {
  margin: 0;
  color: var(--muted-strong);
  font-size: 11px;
  line-height: 1.75;
}

.dependency-list {
  display: flex;
  flex-direction: column;
}

.dependency-item {
  width: 100%;
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr) 13px;
  align-items: center;
  gap: 8px;
  padding: 10px 0;
  border: 0;
  border-top: 1px solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.dependency-item:first-child {
  border-top: 0;
}

.dependency-item small {
  color: var(--accent);
  font-size: 8px;
  letter-spacing: 0.07em;
}

.dependency-item span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--muted-strong);
  font-size: 10px;
}

.dependency-item svg {
  width: 12px;
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.5;
}

.dependency-item:hover span,
.dependency-item:hover svg {
  color: var(--text);
  stroke: var(--accent);
}

.empty-detail {
  margin: 0;
  color: #65706e;
  font-size: 10px;
}

.proof-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: proof;
}

.proof-list li {
  position: relative;
  min-height: 33px;
  padding: 0 0 13px 28px;
  color: var(--muted-strong);
  font-family: "STSong", "Songti SC", "SimSun", serif;
  font-size: 11px;
  line-height: 1.65;
  counter-increment: proof;
}

.proof-list li::before {
  content: counter(proof, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  color: var(--accent);
  font: 8px/1.5 "Segoe UI", sans-serif;
}

.proof-list li:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 8px;
  top: 16px;
  bottom: 1px;
  width: 1px;
  background: var(--line);
}

.impact-section {
  padding-top: 17px;
  border-top: 1px solid var(--line);
}

.source-note {
  display: grid;
  grid-template-columns: 17px 1fr;
  gap: 10px;
  margin-top: 27px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.source-note svg {
  width: 16px;
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.25;
}

.source-note p {
  margin: 0;
  color: #687270;
  font-size: 9px;
  line-height: 1.65;
}

.panel-close {
  position: absolute;
  z-index: 5;
  top: 5px;
  right: 7px;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 25px;
  cursor: pointer;
}

.mobile-search-section {
  position: relative;
  padding: 14px 18px 16px;
  border-bottom: 1px solid var(--line);
}

.mobile-search-box {
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 12px;
  border: 1px solid var(--line-strong);
  background: #0d1113;
}

.mobile-search-box svg,
.install-app-button svg {
  width: 18px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.55;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.mobile-search-box input {
  min-width: 0;
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-size: 14px;
}

.mobile-search-box input::placeholder {
  color: #64706d;
}

.mobile-search-results {
  margin-top: 8px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #121719;
}

.mobile-search-results[hidden] {
  display: none;
}

.mobile-install-section {
  gap: 10px;
}

.install-app-button {
  width: 100%;
  min-height: 66px;
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  border: 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--accent);
  text-align: left;
  cursor: pointer;
}

.install-app-button span {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.install-app-button strong {
  color: var(--muted-strong);
  font-size: 11px;
  font-weight: 580;
}

.install-app-button small {
  color: #65706d;
  font-size: 9px;
  line-height: 1.5;
}

.install-app-button i {
  font-size: 17px;
  font-style: normal;
}

.install-app-button:hover,
.install-app-button.is-installed {
  background: var(--accent-soft);
}

.install-app-button:hover strong,
.install-app-button.is-installed strong {
  color: var(--accent);
}

.autosave-note {
  margin: 14px 0 0;
  display: flex;
  align-items: center;
  gap: 8px;
  color: #66716f;
  font-size: 9px;
  line-height: 1.5;
}

.autosave-note i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px rgba(221, 189, 121, 0.42);
}

.app-toast {
  position: fixed;
  z-index: 80;
  left: 50%;
  bottom: max(20px, env(safe-area-inset-bottom));
  width: min(calc(100vw - 32px), 430px);
  padding: 13px 16px;
  border: 1px solid rgba(221, 189, 121, 0.38);
  background: rgba(19, 24, 26, 0.97);
  color: var(--muted-strong);
  font-size: 11px;
  line-height: 1.55;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 14px);
  transition: opacity 180ms ease, transform 240ms cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.42);
}

.app-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.app-toast.is-error {
  border-color: rgba(213, 121, 111, 0.45);
  color: #dda39c;
}

.mobile-only,
.mobile-backdrop {
  display: none;
}

.is-hidden {
  display: none !important;
}

/* Build mode */

.build-route-intro {
  padding-top: 27px;
}

.build-route-intro h1 {
  margin: 0;
  font-size: 25px;
  font-weight: 520;
}

.build-route-intro > p:not(.eyebrow) {
  margin: 12px 0 17px;
  color: var(--muted);
  font-size: 11px;
  line-height: 1.75;
}

.route-progress {
  width: 100%;
  height: 2px;
  overflow: hidden;
  background: rgba(221, 229, 226, 0.1);
}

.route-progress i {
  display: block;
  width: 8.33%;
  height: 100%;
  background: var(--accent);
  transition: width 500ms cubic-bezier(0.22, 1, 0.36, 1);
}

.route-progress-copy {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 9px;
}

.route-section {
  padding-bottom: 12px;
}

.route-list {
  margin-top: 9px;
}

.route-item {
  min-height: 57px;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) 15px;
  align-items: center;
  gap: 8px;
  border-top: 1px solid var(--line);
}

.route-item:first-child {
  border-top: 0;
}

.route-index {
  color: #626d6a;
  font-size: 9px;
  letter-spacing: 0.08em;
}

.route-item div {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.route-item strong {
  overflow: hidden;
  color: var(--muted-strong);
  font-size: 11px;
  font-weight: 540;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.route-item small {
  color: #5e6966;
  font-size: 9px;
}

.route-item > i {
  color: #58625f;
  font-size: 10px;
  font-style: normal;
  text-align: right;
}

.route-item.is-complete .route-index,
.route-item.is-complete > i,
.route-item.is-active .route-index {
  color: var(--accent);
}

.route-item.is-active {
  position: relative;
}

.route-item.is-active::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 17px;
  bottom: 17px;
  width: 1px;
  background: var(--accent);
}

.route-item.is-active strong {
  color: var(--text);
}

.route-item.is-locked {
  opacity: 0.52;
}

.route-item.is-new {
  animation: route-unlock 700ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes route-unlock {
  0% { opacity: 0.35; transform: translateY(5px); }
  55% { background: var(--accent-soft); }
  100% { opacity: 1; transform: translateY(0); background: transparent; }
}

.unlocked-list {
  display: flex;
  flex-direction: column;
  margin-top: 10px;
}

.unlocked-list span {
  padding: 10px 0;
  border-top: 1px solid var(--line);
  color: var(--muted-strong);
  font-size: 10px;
}

.unlocked-list span:first-child {
  border-top: 0;
}

.unlocked-list b {
  margin-right: 7px;
  color: var(--accent);
  font-size: 8px;
  font-weight: 600;
}

.build-session-section {
  border-bottom: 0;
}

.build-session-meta {
  display: flex;
  gap: 18px;
  color: var(--muted);
  font-size: 9px;
}

.build-session-meta b {
  margin-right: 3px;
  color: var(--text);
  font-size: 13px;
  font-weight: 520;
}

.build-workspace-heading h2 {
  max-width: 520px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.build-stage-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 9px;
}

.stage-status-light {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px rgba(221, 189, 121, 0.5);
}

.construction-stage {
  position: relative;
  min-height: 0;
  display: grid;
  grid-template-rows: 50px minmax(0, 1fr) 70px;
  overflow: hidden;
  background-color: #0b0e10;
  background-image: radial-gradient(rgba(213, 223, 219, 0.12) 0.65px, transparent 0.65px);
  background-size: 20px 20px;
}

.construction-instruction {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(11, 14, 16, 0.88);
}

.construction-instruction span {
  color: var(--accent);
  font-size: 8px;
  font-weight: 650;
  letter-spacing: 0.12em;
}

.construction-instruction strong {
  overflow: hidden;
  color: var(--muted-strong);
  font-size: 10px;
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.construction-board {
  position: relative;
  min-height: 0;
  overflow: hidden;
}

#constructionSvg {
  width: 100%;
  height: 100%;
  min-height: 410px;
  display: block;
  cursor: crosshair;
}

.construction-axis {
  stroke: rgba(221, 229, 226, 0.055);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.given-segment,
.constructed-segment {
  fill: none;
  stroke-linecap: round;
  vector-effect: non-scaling-stroke;
}

.given-segment {
  stroke: rgba(237, 240, 235, 0.78);
  stroke-width: 2;
}

.constructed-segment {
  stroke: var(--accent);
  stroke-width: 2;
  stroke-dasharray: 680;
  animation: draw-geometry 520ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.construction-circle {
  fill: none;
  stroke: rgba(221, 189, 121, 0.72);
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
  stroke-dasharray: 1900;
  animation: draw-geometry 720ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes draw-geometry {
  from { stroke-dashoffset: 1900; opacity: 0.25; }
  to { stroke-dashoffset: 0; opacity: 1; }
}

.construction-point {
  cursor: pointer;
}

.construction-point .point-hit {
  fill: transparent;
  stroke: none;
  pointer-events: all;
}

.construction-point .point-halo,
.construction-point .point-core,
.construction-point .point-label,
.construction-point .point-coordinate {
  pointer-events: none;
}

.construction-point .point-halo {
  fill: transparent;
  stroke: transparent;
  stroke-width: 1;
  transition: fill 150ms ease, stroke 150ms ease;
}

.construction-point:hover .point-halo,
.construction-point.is-pending .point-halo {
  fill: rgba(221, 189, 121, 0.1);
  stroke: rgba(221, 189, 121, 0.48);
}

.construction-point .point-core {
  fill: var(--text);
}

.construction-point.is-new .point-core {
  fill: var(--accent);
  animation: point-arrive 500ms cubic-bezier(0.2, 1.4, 0.4, 1) both;
}

@keyframes point-arrive {
  from { r: 1; opacity: 0; }
  60% { r: 7; opacity: 1; }
  to { r: 4.5; opacity: 1; }
}

.point-label {
  fill: var(--text);
  font: 600 15px/1 "Segoe UI", sans-serif;
  pointer-events: none;
}

.point-coordinate {
  fill: #66716f;
  font: 9px/1 "Segoe UI", sans-serif;
  letter-spacing: 0.08em;
  pointer-events: none;
}

.intersection-ghost {
  cursor: pointer;
  animation: ghost-pulse 1.8s ease-in-out infinite;
}

.intersection-ghost circle {
  fill: rgba(221, 189, 121, 0.12);
  stroke: var(--accent);
  stroke-width: 1.4;
  vector-effect: non-scaling-stroke;
}

.intersection-ghost text {
  fill: var(--accent);
  font: 9px/1 "Segoe UI", sans-serif;
  letter-spacing: 0.08em;
  pointer-events: none;
}

@keyframes ghost-pulse {
  0%, 100% { opacity: 0.55; }
  50% { opacity: 1; }
}

.construction-note {
  fill: #596360;
  font: 9px/1.5 "Segoe UI", sans-serif;
  letter-spacing: 0.06em;
}

.build-toast {
  position: absolute;
  left: 50%;
  bottom: 18px;
  z-index: 5;
  max-width: calc(100% - 40px);
  padding: 9px 13px;
  border: 1px solid var(--line-strong);
  background: rgba(17, 22, 24, 0.94);
  color: var(--muted-strong);
  font-size: 10px;
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 8px);
  transition: opacity 180ms ease, transform 180ms ease;
}

.build-toast.is-visible {
  opacity: 1;
  transform: translate(-50%, 0);
}

.build-toast.is-error {
  border-color: rgba(213, 121, 111, 0.4);
  color: var(--danger);
}

.completion-mark {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 4;
  width: 170px;
  height: 170px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(221, 189, 121, 0.54);
  border-radius: 50%;
  background: rgba(11, 14, 16, 0.84);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -50%) scale(0.72) rotate(-8deg);
}

.completion-mark::before,
.completion-mark::after {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(221, 189, 121, 0.22);
  border-radius: 50%;
}

.completion-mark::after {
  inset: -14px;
  border-style: dashed;
}

.completion-mark span {
  color: var(--accent);
  font-size: 9px;
  letter-spacing: 0.14em;
}

.completion-mark strong {
  margin-top: 7px;
  font-family: "STSong", "Songti SC", "SimSun", serif;
  font-size: 20px;
  font-weight: 500;
}

.completion-mark.is-visible {
  animation: completion-arrive 900ms cubic-bezier(0.2, 1.2, 0.35, 1) both;
}

@keyframes completion-arrive {
  0% { opacity: 0; transform: translate(-50%, -50%) scale(0.72) rotate(-8deg); }
  65% { opacity: 1; transform: translate(-50%, -50%) scale(1.04) rotate(1deg); }
  100% { opacity: 1; transform: translate(-50%, -50%) scale(1) rotate(0); }
}

.construction-toolbar {
  position: relative;
  z-index: 4;
  display: flex;
  align-items: stretch;
  justify-content: center;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  background: rgba(14, 18, 20, 0.97);
}

.construction-tool {
  min-width: 118px;
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  grid-template-rows: 1fr 1fr;
  align-items: end;
  column-gap: 9px;
  padding: 11px 15px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  text-align: left;
  cursor: pointer;
  transition: background 150ms ease, color 150ms ease;
}

.construction-tool svg {
  grid-row: 1 / 3;
  align-self: center;
  width: 21px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.construction-tool span {
  align-self: end;
  color: var(--muted-strong);
  font-size: 10px;
}

.construction-tool small {
  align-self: start;
  color: #5b6663;
  font-size: 8px;
}

.construction-tool:hover:not(:disabled),
.construction-tool.is-active {
  background: var(--accent-soft);
  color: var(--accent);
}

.construction-tool.is-active {
  box-shadow: inset 0 1px var(--accent);
}

.construction-tool.is-active span {
  color: var(--accent);
}

.construction-tool:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

.construction-tool.utility-tool {
  min-width: 72px;
  grid-template-columns: 20px 1fr;
  grid-template-rows: 1fr;
  align-items: center;
}

.construction-tool.utility-tool svg {
  grid-row: 1;
  width: 17px;
}

.construction-tool.utility-tool span {
  align-self: center;
}

.tool-divider {
  width: 18px;
  flex: 0 0 auto;
  border-right: 1px solid var(--line);
}

.requirement-list {
  display: flex;
  flex-direction: column;
}

.requirement-list > div {
  min-height: 41px;
  display: grid;
  grid-template-columns: 16px minmax(0, 1fr);
  align-items: center;
  gap: 9px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 10px;
  line-height: 1.5;
  transition: color 180ms ease;
}

.requirement-list > div:first-child {
  border-top: 0;
}

.requirement-list i {
  width: 13px;
  height: 13px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  font-size: 8px;
  font-style: normal;
}

.requirement-list > div.is-met {
  color: var(--muted-strong);
}

.requirement-list > div.is-met i {
  border-color: var(--accent);
  background: var(--accent);
  color: #16120a;
}

.requirement-list > div.is-met i::after {
  content: "✓";
}

.hint-section {
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.hint-copy {
  min-height: 53px;
}

.secondary-action,
.primary-action {
  width: 100%;
  min-height: 39px;
  padding: 0 14px;
  cursor: pointer;
}

.secondary-action {
  margin-top: 12px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--muted-strong);
  font-size: 10px;
}

.secondary-action:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.primary-action {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #17130b;
  font-size: 10px;
  font-weight: 650;
}

.primary-action:hover {
  background: #eccd8d;
}

.primary-action.is-shaking {
  animation: validation-shake 360ms ease;
}

@keyframes validation-shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  50% { transform: translateX(5px); }
  75% { transform: translateX(-3px); }
}

.build-validation-section {
  margin-top: 27px;
  padding-top: 19px;
  border-top: 1px solid var(--line);
}

.build-validation-section > p {
  margin: 10px 0 0;
  color: #66716f;
  font-size: 9px;
  line-height: 1.6;
}

.build-complete-section {
  margin-top: 24px;
  padding: 20px 0;
  border-top: 1px solid rgba(221, 189, 121, 0.35);
  border-bottom: 1px solid rgba(221, 189, 121, 0.35);
  animation: complete-panel-arrive 500ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes complete-panel-arrive {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.build-complete-section h3 {
  margin: 0;
  font-family: "STSong", "Songti SC", "SimSun", serif;
  font-size: 20px;
  font-weight: 500;
}

.build-complete-section > p:not(.eyebrow) {
  margin: 10px 0 16px;
  color: var(--muted-strong);
  font-size: 10px;
  line-height: 1.7;
}

.build-inspector.is-complete .status-badge {
  border-color: rgba(221, 189, 121, 0.45);
  background: var(--accent-soft);
  color: var(--accent);
}

.build-inspector.is-placed .status-badge {
  background: var(--accent);
  color: #17130b;
}

body.mode-build .search-box {
  visibility: hidden;
}

/* Offline challenge flow */

.offline-stage {
  grid-template-rows: 50px minmax(0, 1fr) 78px;
}

.offline-board {
  isolation: isolate;
}

.offline-prompt {
  position: absolute;
  z-index: 3;
  top: 24px;
  left: 26px;
  max-width: 390px;
  pointer-events: none;
}

.offline-prompt h3 {
  margin: 0;
  max-width: 380px;
  font-family: "STSong", "Songti SC", "SimSun", serif;
  font-size: 24px;
  font-weight: 500;
  line-height: 1.45;
}

.offline-prompt > p:last-child {
  margin: 9px 0 0;
  max-width: 350px;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.7;
}

.offline-board #constructionSvg {
  min-height: 390px;
}

.marker-example circle {
  fill: var(--accent);
  filter: drop-shadow(0 0 10px rgba(221, 189, 121, 0.42));
}

.marker-example > text {
  fill: var(--text);
  font: 600 15px/1 "Segoe UI", "Microsoft YaHei UI", sans-serif;
}

.marker-example .marker-note {
  fill: var(--muted);
  font-size: 10px;
  font-weight: 400;
}

.expression-card rect {
  fill: rgba(16, 20, 22, 0.9);
  stroke: rgba(221, 229, 226, 0.17);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
  transition: fill 260ms ease, stroke 260ms ease, opacity 260ms ease;
}

.expression-index {
  fill: var(--accent);
  font: 650 11px/1 "Segoe UI", sans-serif;
  letter-spacing: 0.12em;
}

.expression-copy {
  fill: var(--text);
  font: 500 18px/1 "STSong", "Songti SC", "SimSun", serif;
}

.expression-note {
  fill: #606b68;
  font: 9px/1 "Segoe UI", "Microsoft YaHei UI", sans-serif;
  letter-spacing: 0.04em;
}

.expression-card.is-answer rect {
  fill: rgba(221, 189, 121, 0.1);
  stroke: var(--accent);
  animation: expression-answer 520ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.expression-card.is-answer .expression-note {
  fill: var(--accent);
}

.expression-card.is-rejected {
  opacity: 0.42;
}

.expression-check {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  vector-effect: non-scaling-stroke;
  stroke-dasharray: 32;
  animation: expression-check 500ms 260ms both;
}

@keyframes expression-answer {
  from { opacity: 0.35; transform: translateY(7px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes expression-check {
  from { stroke-dashoffset: 32; }
  to { stroke-dashoffset: 0; }
}

.unknown-point {
  opacity: 0.54;
  animation: unknown-breathe 2.6s ease-in-out infinite;
}

.unknown-point circle {
  fill: rgba(221, 189, 121, 0.05);
  stroke: rgba(221, 189, 121, 0.34);
  stroke-width: 1;
  stroke-dasharray: 3 5;
  vector-effect: non-scaling-stroke;
}

.unknown-point text {
  fill: var(--accent);
  font: 400 16px/1 "STSong", "Songti SC", serif;
  text-anchor: middle;
}

@keyframes unknown-breathe {
  0%, 100% { opacity: 0.38; }
  50% { opacity: 0.8; }
}

.reference-circle.circle-a {
  animation-delay: 40ms;
}

.reference-circle.circle-b {
  animation-delay: 260ms;
}

.reference-edge.edge-a {
  animation-delay: 520ms;
}

.reference-edge.edge-b {
  animation-delay: 680ms;
}

.reference-caption {
  fill: var(--accent);
  font: 10px/1.5 "Segoe UI", sans-serif;
  letter-spacing: 0.05em;
  animation: caption-arrive 600ms 760ms both;
}

.reference-caption.is-muted {
  fill: #5d6865;
  animation-delay: 0ms;
}

@keyframes caption-arrive {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.offline-phase-rail {
  position: absolute;
  z-index: 3;
  left: 26px;
  right: 26px;
  bottom: 18px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
}

.offline-phase-rail span {
  position: relative;
  padding-top: 10px;
  color: #56605e;
  font-size: 9px;
  letter-spacing: 0.03em;
}

.offline-phase-rail span::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 320ms ease;
}

.offline-phase-rail b {
  margin-right: 6px;
  font-size: 8px;
  font-weight: 550;
}

.offline-phase-rail span.is-current {
  color: var(--text);
}

.offline-phase-rail span.is-current::before,
.offline-phase-rail span.is-complete::before {
  width: 72%;
}

.offline-phase-rail span.is-current b,
.offline-phase-rail span.is-complete {
  color: var(--accent);
}

.offline-actions {
  position: relative;
  z-index: 4;
  display: flex;
  align-items: stretch;
  justify-content: center;
  overflow-x: auto;
  border-top: 1px solid var(--line);
  background: rgba(14, 18, 20, 0.97);
}

.offline-action {
  min-width: 172px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  padding: 0 18px;
  border: 0;
  border-right: 1px solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.offline-action[hidden] {
  display: none;
}

.offline-board .construction-point {
  cursor: default;
}

.offline-action span {
  color: #5d6765;
  font-size: 8px;
  letter-spacing: 0.08em;
}

.offline-action strong {
  color: var(--muted-strong);
  font-size: 10px;
  font-weight: 550;
}

.offline-action:hover:not(:disabled) {
  background: var(--accent-soft);
}

.offline-action:hover:not(:disabled) strong {
  color: var(--accent);
}

.offline-action.primary {
  box-shadow: inset 0 1px var(--accent);
  background: rgba(221, 189, 121, 0.055);
}

.offline-action.primary strong {
  color: var(--accent);
}

.offline-action.reset {
  min-width: 104px;
}

.offline-action:disabled {
  opacity: 0.36;
  cursor: not-allowed;
}

.self-check-intro {
  margin-bottom: 9px !important;
}

.self-check-list {
  display: flex;
  flex-direction: column;
}

.self-check-item {
  padding: 12px 0;
  border-top: 1px solid var(--line);
}

.self-check-item:first-child {
  border-top: 0;
}

.self-check-item p {
  margin: 0;
  color: var(--muted-strong);
  font-family: "STSong", "Songti SC", "SimSun", serif;
  font-size: 11px;
  line-height: 1.6;
}

.self-check-item p b {
  margin-right: 7px;
  color: var(--accent);
  font: 8px/1 "Segoe UI", sans-serif;
}

.self-check-item button {
  margin-top: 9px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 9px;
  cursor: pointer;
}

.self-check-item button:hover {
  color: var(--accent);
}

.self-check-item span {
  display: block;
  margin-top: 8px;
  padding-left: 16px;
  border-left: 1px solid var(--accent);
  color: var(--muted-strong);
  font-size: 10px;
  line-height: 1.7;
  animation: answer-arrive 320ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.self-check-item span[hidden] {
  display: none;
}

@keyframes answer-arrive {
  from { opacity: 0; transform: translateY(5px); }
  to { opacity: 1; transform: translateY(0); }
}

.reference-proof-section {
  margin-top: 25px;
  padding-top: 19px;
  border-top: 1px solid rgba(221, 189, 121, 0.34);
  animation: complete-panel-arrive 500ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

.reference-proof-section h3 {
  margin: 0 0 16px;
  font-family: "STSong", "Songti SC", "SimSun", serif;
  font-size: 18px;
  font-weight: 500;
  line-height: 1.5;
}

.assessment-section {
  margin-top: 25px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.assessment-section > p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 9px;
  line-height: 1.65;
}

.assessment-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.assessment-options button {
  min-height: 64px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 5px;
  padding: 9px 10px;
  border: 0;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.assessment-options button:hover:not(:disabled),
.assessment-options button.is-selected {
  background: var(--accent-soft);
}

.assessment-options button.is-selected {
  box-shadow: inset 0 0 0 1px var(--accent);
}

.assessment-options button:disabled {
  opacity: 0.36;
  cursor: not-allowed;
}

.assessment-options strong {
  color: var(--muted-strong);
  font-size: 10px;
  font-weight: 560;
}

.assessment-options span {
  color: #626c69;
  font-size: 8px;
}

.wing-jump-section {
  padding-top: 17px;
  padding-bottom: 17px;
}

.wing-jump {
  width: 100%;
  min-height: 50px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0;
  border: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.wing-jump span {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.wing-jump strong {
  color: var(--muted-strong);
  font-size: 10px;
  font-weight: 560;
}

.wing-jump small {
  color: #5f6967;
  font-size: 8px;
}

.wing-jump i {
  color: var(--accent);
  font-size: 15px;
  font-style: normal;
  transition: transform 180ms ease;
}

.wing-jump:hover strong {
  color: var(--accent);
}

.wing-jump:hover i {
  transform: translateX(4px);
}

@media (max-width: 1180px) {
  :root {
    --sidebar-width: 260px;
    --inspector-width: 318px;
  }

  .topbar {
    grid-template-columns: var(--sidebar-width) minmax(150px, 1fr) minmax(250px, 330px) var(--inspector-width);
  }

  .mode-button {
    padding-left: 11px;
    padding-right: 11px;
  }

  .brand,
  .sidebar-section {
    padding-left: 18px;
    padding-right: 18px;
  }

  .inspector-scroll {
    padding-left: 21px;
    padding-right: 21px;
  }
}

@media (max-width: 900px) {
  :root {
    --topbar-height: calc(58px + env(safe-area-inset-top));
  }

  .mobile-only {
    display: grid;
  }

  .topbar {
    grid-template-columns: minmax(150px, 1fr) minmax(190px, 0.9fr) auto;
    padding-top: env(safe-area-inset-top);
  }

  .brand {
    border-right: 0;
  }

  .search-box,
  .quiet-button {
    display: none;
  }

  .mode-switch {
    grid-column: 2;
    border-left: 1px solid var(--line);
  }

  .topbar-actions {
    grid-column: 3;
    gap: 6px;
    padding: 0 7px;
  }

  .topbar-actions .icon-button {
    width: 44px;
    height: 44px;
  }

  .app-layout {
    grid-template-columns: 1fr;
  }

  .workspace {
    grid-column: 1;
  }

  .construction-stage {
    grid-template-rows: 46px minmax(0, 1fr) 66px;
  }

  .offline-stage {
    grid-template-rows: 46px minmax(0, 1fr) 72px;
  }

  .construction-tool {
    min-width: 110px;
  }

  .offline-action {
    min-width: 158px;
  }

  .sidebar,
  .inspector {
    position: fixed;
    z-index: 45;
    top: var(--topbar-height);
    bottom: 0;
    width: min(88vw, 340px);
    transition: transform 260ms cubic-bezier(0.22, 1, 0.36, 1);
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }

  .sidebar {
    left: 0;
    padding-top: 48px;
    padding-bottom: env(safe-area-inset-bottom);
    transform: translateX(-102%);
    box-shadow: 20px 0 70px rgba(0, 0, 0, 0.36);
  }

  .inspector {
    right: 0;
    transform: translateX(102%);
    box-shadow: -20px 0 70px rgba(0, 0, 0, 0.36);
  }

  .sidebar.is-open,
  .inspector.is-open {
    transform: translateX(0);
  }

  .mobile-backdrop {
    position: fixed;
    inset: var(--topbar-height) 0 0;
    z-index: 40;
    background: rgba(0, 0, 0, 0.38);
  }

  .mobile-backdrop.is-visible {
    display: block;
  }

  .inspector-close {
    position: absolute;
    z-index: 2;
    top: 12px;
    right: 13px;
    width: 44px;
    height: 44px;
    border: 0;
    background: transparent;
    color: var(--muted);
    font-size: 25px;
    cursor: pointer;
  }

  .mobile-search-section .search-result {
    min-height: 48px;
  }
}

@media (max-width: 620px) {
  .topbar {
    grid-template-columns: auto minmax(128px, 1fr) auto;
  }

  .brand {
    padding: 0 10px 0 max(10px, env(safe-area-inset-left));
  }

  .brand-copy {
    display: none;
  }

  .mode-button {
    padding: 0 9px;
    align-items: center;
    text-align: center;
  }

  .mode-button small {
    display: none;
  }

  .workspace {
    grid-template-rows: 52px minmax(0, 1fr);
  }

  .sidebar {
    width: min(92vw, 380px);
    padding-left: env(safe-area-inset-left);
  }

  .inspector {
    top: auto;
    left: 0;
    right: 0;
    width: 100%;
    height: min(82svh, 720px);
    padding-bottom: env(safe-area-inset-bottom);
    border-top: 1px solid rgba(221, 189, 121, 0.34);
    transform: translateY(102%);
    box-shadow: 0 -24px 70px rgba(0, 0, 0, 0.5);
  }

  .inspector::before {
    content: "";
    position: absolute;
    z-index: 2;
    top: 9px;
    left: 50%;
    width: 38px;
    height: 3px;
    border-radius: 3px;
    background: rgba(221, 229, 226, 0.24);
    transform: translateX(-50%);
  }

  .inspector.is-open {
    transform: translateY(0);
  }

  .inspector-scroll {
    padding-top: 56px;
    padding-bottom: calc(28px + env(safe-area-inset-bottom));
  }

  .inspector-close {
    top: 8px;
    right: max(7px, env(safe-area-inset-right));
  }

  .workspace-heading {
    padding: 0 13px;
  }

  .legend span:not(:first-child) {
    display: none;
  }

  .build-workspace-heading h2 {
    max-width: 240px;
  }

  .build-stage-status {
    display: none;
  }

  .construction-instruction {
    padding: 0 12px;
  }

  .construction-instruction span {
    display: none;
  }

  #constructionSvg {
    min-height: 360px;
  }

  .offline-prompt {
    top: 18px;
    left: 18px;
    right: 18px;
  }

  .offline-prompt h3 {
    font-size: 20px;
  }

  .offline-phase-rail {
    left: 17px;
    right: 17px;
    bottom: 12px;
  }

  .offline-phase-rail span {
    font-size: 0;
  }

  .offline-phase-rail b {
    font-size: 8px;
  }

  .offline-actions {
    justify-content: flex-start;
    padding-bottom: env(safe-area-inset-bottom);
    scroll-snap-type: x proximity;
  }

  .offline-action {
    min-width: 150px;
    padding: 0 14px;
    scroll-snap-align: start;
  }

  .construction-toolbar {
    justify-content: flex-start;
  }

  .construction-tool {
    min-width: 101px;
    padding-left: 11px;
    padding-right: 11px;
  }

  .construction-tool.utility-tool {
    min-width: 68px;
  }

  .canvas-hint {
    display: none;
  }

  .app-toast {
    bottom: calc(14px + env(safe-area-inset-bottom));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}