:root {
  --paper: #f8faff;
  --paper-light: #ffffff;
  --ink: #405777;
  --muted: #8c9fc5;
  --gold: #bdcbea;
  --line: #eef3ff;
  --blue: #8c9fc5;
  --purple: #8c9fc5;
  --green: #8c9fc5;
  --shadow: 0 9px 30px #40577726;
  --serif: "Palatino Linotype", "Noto Serif SC", "Songti SC", "SimSun", serif;
  --sans: "Microsoft YaHei", "PingFang SC", sans-serif;
}
* {
  box-sizing: border-box;
}
html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
}
body {
  font: 14px/1.6 var(--sans);
  color: var(--ink);
  background: #dfe8fa;
}
button,
input,
select {
  font: inherit;
}
button,
a,
input {
  touch-action: manipulation;
}
button {
  cursor: pointer;
  color: inherit;
}
button {
  border: 0;
  background: none;
}
a {
  color: inherit;
  text-decoration: none;
}
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid #8c9fc5;
  outline-offset: 4px;
}
button:disabled {
  opacity: 0.45;
  cursor: default;
}
button svg,
span[data-icon] svg {
  width: 20px;
  height: 20px;
  display: block;
}
button {
  transition:
    background 0.18s,
    transform 0.18s,
    color 0.18s;
}
:where(button:hover:not(:disabled)) {
  color: #526b94;
}
button:active:not(:disabled) {
  transform: translateY(1px);
}
[hidden] {
  display: none !important;
}
.eyebrow {
  font-size: 10px;
  letter-spacing: 2px;
  font-weight: 600;
  color: #526b94;
}
.paper {
  background: linear-gradient(135deg, #fffffff7, #f8fafff7);
  border: 1px solid #dfe8fa;
  border-radius: 9px;
  box-shadow: var(--shadow);
  position: relative;
}
.paper:before {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid #dfe8fa2c;
  border-radius: 5px;
  pointer-events: none;
}
h1,
h2,
h3,
p {
  margin: 0;
}
.topbar {
  height: 86px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 36px;
  background: var(--paper);
  border-bottom: 1px solid #dfe8fa;
  box-shadow: 0 3px 18px #40577720;
  position: relative;
  z-index: 20;
  gap: 20px;
}
.brand {
  display: flex;
  gap: 13px;
  align-items: center;
  white-space: nowrap;
}
.brand-compass {
  font-size: 65px;
  line-height: 1;
  color: #526b94;
  text-shadow: 1px 1px #ffffff;
}
.brand strong {
  font: 600 27px/1.2 var(--serif);
  letter-spacing: 4px;
}
.brand small {
  display: block;
  font-size: 8px;
  letter-spacing: 2.5px;
  color: #526b94;
  margin-top: 6px;
}
.subjects {
  display: flex;
  padding: 5px;
  gap: 3px;
  border: 1px solid #eef3ff;
  background: #f8faff;
  border-radius: 7px;
}
.subjects button {
  padding: 9px 20px;
  font-size: 13px;
  border: 1px solid transparent;
  white-space: nowrap;
}
.subjects button.active {
  border-color: #dfe8fa;
  background: #ffffff;
  border-radius: 4px;
  box-shadow: 0 2px 5px #4057770d;
  color: #667a9d;
}
.subject-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  margin-right: 7px;
  vertical-align: 2px;
}
.physics {
  background: var(--blue);
}
.maths {
  background: var(--purple);
}
.chemistry {
  background: var(--green);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 19px;
}
.icon-button {
  padding: 10px;
}
.icon-button svg {
  width: 21px;
  height: 21px;
}
.header-divider {
  height: 22px;
  border-left: 1px solid var(--line);
}
.journal-button {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  white-space: nowrap;
}
.journal-button b {
  font-size: 10px;
  border: 1px solid #eef3ff;
  border-radius: 50%;
  width: 21px;
  height: 21px;
  line-height: 19px;
  color: #526b94;
  font-weight: 400;
}
.map-stage {
  height: calc(100dvh - 128px);
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: #bdcbea;
  touch-action: none;
  cursor: grab;
}
.map-stage.dragging {
  cursor: grabbing;
}
.world {
  width: 1600px;
  height: 1000px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform-origin: 50% 50%;
  will-change: transform;
  user-select: none;
}
.world-art {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}
.world:after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    #eef3ff33 0%,
    transparent 35%,
    transparent 80%,
    #4057770d
  );
  z-index: 1;
}
.world-edges {
  position: absolute;
  inset: 0;
  width: 1600px;
  height: 1000px;
  z-index: 3;
  pointer-events: none;
  overflow: visible;
}
.relation-path {
  fill: none;
  stroke: #eef3ff;
  stroke-width: 3;
  filter: drop-shadow(0 1px 4px #667a9d);
  opacity: 0.94;
  pointer-events: stroke;
  cursor: pointer;
}
.relation-path.prep {
  stroke-dasharray: 7 7;
  stroke-width: 2;
}
.relation-path.route-path {
  stroke: #ffffff;
  stroke-width: 3;
  stroke-dasharray: 5 8;
}
.edge-label {
  font-size: 14px;
  fill: #ffffff;
  paint-order: stroke;
  stroke: #405777d9;
  stroke-width: 5px;
  stroke-linejoin: round;
  letter-spacing: 1px;
}
.island-name {
  position: absolute;
  text-align: center;
  z-index: 4;
  pointer-events: none;
  text-shadow:
    0 2px 12px #f8faff,
    1px 1px 2px #ffffff,
    0 0 20px #f8faff;
}
.island-name > span {
  font: 9px/1 var(--sans);
  letter-spacing: 3px;
  color: #405777;
}
.island-name h2 {
  font: 600 33px/1.7 var(--serif);
  letter-spacing: 7px;
  color: #405777;
}
.island-name p {
  font-size: 11px;
  letter-spacing: 3px;
  color: #667a9d;
}
.maths-name {
  left: 210px;
  top: 110px;
}
.physics-name {
  left: 1080px;
  top: 68px;
}
.chemistry-name {
  left: 660px;
  top: 890px;
}
.harbor-label {
  position: absolute;
  left: 735px;
  top: 506px;
  z-index: 4;
  color: #ffffff;
  font: 15px var(--serif);
  letter-spacing: 3px;
  text-shadow: 0 1px 6px #405777;
}
.map-intro {
  position: absolute;
  left: 34px;
  top: 27px;
  z-index: 5;
  pointer-events: none;
  text-shadow:
    0 1px 10px #f8faff,
    0 0 20px #f8faff;
}
.map-intro .eyebrow {
  color: #667a9d;
  font-size: 9px;
  letter-spacing: 2.7px;
}
.map-intro h1 {
  font: 500 26px/1.6 var(--serif);
  letter-spacing: 2px;
  color: #405777;
}
.map-intro p {
  color: #667a9d;
  font-size: 11px;
  margin-top: 2px;
  letter-spacing: 1px;
}
.map-view-switch {
  display: flex;
  gap: 4px;
  position: absolute;
  left: 50%;
  top: 23px;
  transform: translateX(-50%);
  z-index: 6;
  background: #f8faffed;
  border: 1px solid #dfe8fa;
  padding: 4px;
  border-radius: 6px;
  box-shadow: 0 3px 16px #40577715;
}
.map-view-switch button {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border-radius: 3px;
  font-size: 11px;
  color: #526b94;
}
.map-view-switch svg {
  width: 15px;
  height: 15px;
}
.map-view-switch .active {
  color: #667a9d;
  background: #eef3ff;
}
.map-tools {
  display: flex;
  position: absolute;
  right: 28px;
  top: 26px;
  gap: 8px;
  z-index: 6;
}
.paper-tool {
  display: flex;
  align-items: center;
  gap: 7px;
  background: #f8faffe8;
  border: 1px solid #dfe8fa;
  border-radius: 5px;
  padding: 9px 12px;
  font-size: 11px;
  box-shadow: 0 3px 15px #4057771a;
}
.paper-tool svg {
  width: 16px;
  height: 16px;
}
.paper-tool[aria-pressed="true"] {
  background: #eef3ff;
  color: #667a9d;
}
.map-node {
  --node-color: #526b94;
  position: absolute;
  z-index: 5;
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 100px;
  transform: translate(-50%, -50%);
  padding: 4px;
  filter: drop-shadow(0 2px 3px #40577740);
}
.map-node:hover {
  z-index: 9;
}
.node-pin {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: 2px solid #f8faff;
  background: var(--node-color);
  border-radius: 50%;
  box-shadow:
    0 0 0 3px #40577766,
    0 5px 0 #40577755;
  transition:
    transform 0.2s,
    box-shadow 0.2s;
  color: #ffffff;
}
.node-pin svg {
  width: 14px;
  height: 14px;
}
.map-node:hover .node-pin {
  transform: translateY(-5px);
  box-shadow:
    0 0 0 5px #f8faff77,
    0 8px 0 #40577733;
}
.node-label {
  margin-top: 9px;
  padding: 3px 10px;
  color: #405777;
  font: 600 13px/1.7 var(--serif);
  letter-spacing: 1px;
  background: #ffffffed;
  border: 1px solid #dfe8fa;
  border-radius: 3px;
  white-space: nowrap;
  box-shadow: 0 2px 5px #40577730;
}
.map-node.minor .node-pin {
  width: 18px;
  height: 18px;
  opacity: 0.85;
}
.map-node.minor .node-label {
  display: none;
}
.map-node.minor:hover .node-label,
.map-node.minor:focus-visible .node-label {
  display: block;
  position: absolute;
  top: 23px;
}
.map-node.experiment .node-pin {
  width: 43px;
  height: 43px;
  background: linear-gradient(140deg, #eef3ff, #bdcbea);
  color: #667a9d;
  border: 3px solid #f8faff;
  box-shadow:
    0 0 0 5px #dfe8fa44,
    0 5px 0 #667a9d70;
}
.map-node.experiment .node-pin svg {
  width: 21px;
  height: 21px;
}
.map-node.experiment .node-label {
  background: #ffffff;
  font-size: 15px;
  padding: 4px 15px;
  color: #667a9d;
}
.map-node.selected .node-pin {
  box-shadow:
    0 0 0 7px #f8faff70,
    0 0 25px #f8faff;
}
.map-node.visited:after {
  content: "";
  width: 5px;
  height: 12px;
  background: #dfe8fa;
  position: absolute;
  right: 35px;
  top: 0;
  clip-path: polygon(0 0, 100% 0, 75% 70%, 0 70%);
}
.map-node.verified .node-pin {
  background: #8c9fc5;
}
.map-node.filtered-out {
  opacity: 0.12;
  pointer-events: none;
}
.world.relations-on .world-art {
  filter: saturate(0.7) brightness(0.91);
}
.world.history-mode .world-art {
  filter: sepia(0.35) saturate(0.8);
}
.quest-card {
  position: absolute;
  left: 28px;
  bottom: 27px;
  z-index: 8;
  width: 355px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 19px 20px;
  background: #fffffff5;
}
.quest-emblem {
  color: #526b94;
  border: 1px solid #dfe8fa;
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}
.quest-emblem svg {
  width: 30px !important;
  height: 30px !important;
}
.quest-card .eyebrow {
  font-size: 9px;
  letter-spacing: 2px;
}
.quest-card h3 {
  font: 600 17px/1.8 var(--serif);
  letter-spacing: 0.4px;
}
.quest-card p {
  font-size: 10px;
  color: #526b94;
}
.quest-card > button {
  margin-left: auto;
  padding: 7px;
  color: #526b94;
}
.node-panel {
  position: absolute;
  right: 28px;
  top: 100px;
  width: 290px;
  max-height: calc(100% - 205px);
  z-index: 10;
  overflow: auto;
  animation: panel-in 0.3s ease;
}
.panel-close {
  position: absolute;
  right: 10px;
  top: 10px;
  background: #f8faffee;
  width: 27px;
  height: 27px;
  display: grid;
  place-items: center;
  z-index: 2;
  border-radius: 50%;
}
.panel-close svg {
  width: 15px;
  height: 15px;
}
.panel-art {
  height: 125px;
  overflow: hidden;
  position: relative;
  background: #f8faff;
}
.panel-art img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.35);
  filter: saturate(0.8);
}
.panel-art:after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, #f8faff, transparent 55%);
}
.panel-tag {
  position: absolute;
  bottom: 5px;
  left: 22px;
  font-size: 10px;
  letter-spacing: 2px;
  color: #526b94;
  z-index: 1;
}
.panel-content {
  padding: 10px 22px 21px;
}
.panel-content h2 {
  font: 600 26px/1.5 var(--serif);
  letter-spacing: 2px;
  margin-bottom: 6px;
}
.panel-question {
  font-size: 12px;
  color: #526b94;
  margin-bottom: 15px;
}
.panel-description {
  font-size: 12px;
  color: #526b94;
  line-height: 1.9;
  margin-bottom: 16px;
}
.primary-button {
  width: 100%;
  border: 1px solid #bdcbea;
  border-radius: 5px;
  background: linear-gradient(160deg, #eef3ff, #dfe8fa);
  box-shadow:
    inset 0 1px #f8faff,
    0 3px 7px #667a9d1a;
  padding: 11px 15px;
  color: #667a9d;
  display: flex;
  gap: 9px;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
}
.primary-button:hover {
  background: linear-gradient(160deg, #eef3ff, #dfe8fa);
}
.primary-button svg {
  width: 16px;
  height: 16px;
}
.secondary-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px 12px;
  width: 100%;
  font-size: 11px;
  border: 1px solid #eef3ff;
  border-radius: 4px;
  margin-top: 8px;
  background: #ffffff4d;
}
.secondary-button svg {
  width: 15px;
  height: 15px;
}
.panel-relations {
  border-top: 1px solid #eef3ff;
  margin-top: 16px;
  padding-top: 13px;
}
.panel-relations > span {
  font-size: 9px;
  letter-spacing: 2px;
  color: #697891;
}
.related-node {
  display: flex;
  align-items: center;
  gap: 7px;
  width: 100%;
  padding: 7px 0 0;
  font-size: 11px;
  text-align: left;
  color: #526b94;
}
.related-node svg {
  width: 13px;
  height: 13px;
  margin-left: auto;
}
.related-node .subject-dot {
  margin: 0;
}
.navigation-tools {
  display: flex;
  align-items: center;
  gap: 16px;
  position: absolute;
  right: 29px;
  bottom: 26px;
  z-index: 8;
}
.compass-reset {
  width: 66px;
  height: 75px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #f8faff;
  text-shadow: 0 1px 4px #405777;
}
.compass-reset small {
  font: 10px var(--serif);
}
.compass-reset > span {
  font: 74px/0.8 var(--serif);
  filter: drop-shadow(0 2px 2px #667a9d);
}
.zoom-controls {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 4px;
}
.zoom-controls button {
  height: 31px;
  width: 34px;
  font-size: 22px;
  line-height: 1;
}
.zoom-controls span {
  font-size: 9px;
  color: #697891;
  border-block: 1px solid #eef3ff;
  padding: 3px 0;
  width: 30px;
  text-align: center;
}
.map-hint {
  position: absolute;
  bottom: 23px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 7px;
  align-items: center;
  font-size: 10px;
  letter-spacing: 1px;
  color: #ffffff;
  text-shadow: 0 1px 5px #405777;
  z-index: 6;
  white-space: nowrap;
}
.map-hint svg {
  width: 13px;
  height: 13px;
}
.bottom-bar {
  height: 42px;
  background: var(--paper);
  border-top: 1px solid #dfe8fa;
  display: flex;
  align-items: center;
  padding: 0 33px;
  gap: 9px;
  font-size: 10px;
  color: #526b94;
  position: relative;
  z-index: 15;
}
.live-dot {
  width: 5px;
  height: 5px;
  background: #bdcbea;
  border-radius: 50%;
}
.exploration-progress {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
  margin-right: 34px;
}
.progress-track {
  width: 110px;
  height: 3px;
  background: #eef3ff;
}
.progress-track i {
  height: 100%;
  background: #bdcbea;
  display: block;
  transition: width 0.4s;
}
.bottom-bar > button {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 10px;
}
.bottom-bar svg {
  width: 13px;
  height: 13px;
}
.search-popover {
  position: fixed;
  top: 75px;
  right: 35px;
  width: 390px;
  z-index: 40;
  padding: 16px;
}
.search-popover label {
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 12px;
}
.search-popover input {
  width: 100%;
  border: 0;
  outline: none;
  background: none;
  font-size: 12px;
}
.search-popover kbd {
  font: 9px var(--sans);
  color: #697891;
}
.search-result {
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
  width: 100%;
  padding: 12px 5px;
  border-bottom: 1px solid #eef3ff80;
}
.search-result small {
  margin-left: auto;
  color: #697891;
  font-size: 10px;
}
.search-empty {
  padding: 20px 6px;
  color: #526b94;
  font-size: 12px;
}
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  background: #40577780;
  backdrop-filter: blur(6px);
  padding: 28px;
}
.modal {
  max-width: 760px;
  width: 100%;
  max-height: 90dvh;
  overflow: auto;
  padding: 34px 40px;
  box-shadow: 0 20px 90px #25334f50;
}
.modal h2 {
  font: 600 28px/1.5 var(--serif);
  letter-spacing: 2px;
}
.modal .modal-close {
  position: absolute;
  right: 20px;
  top: 20px;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
}
.modal-eyebrow {
  font-size: 10px;
  letter-spacing: 2px;
  color: #526b94;
  margin-bottom: 9px;
}
.modal-subtitle {
  font-size: 12px;
  color: #526b94;
  margin: 5px 0 23px;
}
.reading-section {
  margin: 22px 0;
}
.reading-section h3 {
  font: 600 17px/1.6 var(--serif);
  margin-bottom: 8px;
}
.reading-section p {
  font-size: 13px;
  color: #526b94;
  line-height: 2;
}
.boundary-note {
  background: #f8faff;
  padding: 13px 17px;
  color: #526b94;
  font-size: 11px;
  border-left: 2px solid #bdcbea;
}
.quiz-box {
  background: #f8faff;
  border: 1px solid #eef3ff;
  border-radius: 6px;
  padding: 20px;
  margin-top: 23px;
}
.quiz-box h3 {
  font-size: 13px;
  margin-bottom: 13px;
}
.quiz-option {
  display: block;
  width: 100%;
  padding: 11px 13px;
  border: 1px solid #eef3ff;
  background: #ffffff;
  border-radius: 4px;
  text-align: left;
  font-size: 12px;
  margin-top: 7px;
}
.quiz-option.correct {
  border-color: #7c9b76;
  background: #e5eedf;
  color: #42603d;
}
.quiz-option.wrong {
  border-color: #ba8c75;
  background: #f0e0d5;
}
.quiz-feedback {
  font-size: 12px;
  margin-top: 13px;
  color: #526b94;
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 24px 0;
}
.stat {
  padding: 16px;
  background: #f8faff;
  text-align: center;
  border-radius: 5px;
}
.stat strong {
  font: 32px var(--serif);
  display: block;
  color: #526b94;
}
.stat span {
  font-size: 11px;
  color: #697891;
}
.journal-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}
.journal-place {
  text-align: left;
  padding: 13px;
  border: 1px solid #eef3ff;
  background: #ffffff55;
  border-radius: 4px;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.journal-place small {
  margin-left: auto;
  font-size: 10px;
  color: #697891;
}
.route-card {
  border: 1px solid #eef3ff;
  padding: 16px;
  margin-top: 10px;
  border-radius: 5px;
  display: flex;
  gap: 15px;
  align-items: center;
}
.route-card > span {
  font: 26px var(--serif);
  color: #697891;
}
.route-card h3 {
  font-size: 13px;
}
.route-card p {
  font-size: 11px;
  color: #697891;
  margin-top: 3px;
}
.route-card button {
  margin-left: auto;
  white-space: nowrap;
  color: #526b94;
  font-size: 12px;
}
.danger-button {
  font-size: 11px;
  color: #526b94;
  margin-top: 25px;
  border-bottom: 1px solid #dfe8fa;
}
.place-index {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.place-index h3 {
  font: 20px var(--serif);
  margin-bottom: 12px;
}
.place-index button {
  display: block;
  width: 100%;
  font-size: 11px;
  text-align: left;
  padding: 9px;
  border-bottom: 1px solid #eef3ff;
}
.history-story {
  padding: 17px 0;
  border-bottom: 1px solid #eef3ff;
}
.history-story small {
  color: #526b94;
  font-size: 10px;
  letter-spacing: 1px;
}
.history-story h3 {
  font: 600 19px var(--serif);
  margin: 6px 0;
}
.history-story p {
  font-size: 12px;
  line-height: 1.9;
  color: #526b94;
}
.toast {
  position: fixed;
  bottom: 60px;
  left: 50%;
  transform: translate(-50%, 15px);
  z-index: 100;
  background: #405777f5;
  color: #ffffff;
  padding: 12px 23px;
  border: 1px solid #dfe8fa55;
  border-radius: 5px;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.2s,
    transform 0.2s;
  max-width: 90%;
  font-size: 12px;
}
.toast.show {
  opacity: 1;
  transform: translate(-50%, 0);
}
.map-loading {
  position: absolute;
  inset: 0;
  z-index: 12;
  background: #eef3ff;
  display: grid;
  place-content: center;
  text-align: center;
  color: #526b94;
  transition: opacity 0.5s;
}
.map-loading.finished {
  opacity: 0;
  pointer-events: none;
}
.loading-compass {
  font: 90px var(--serif);
  color: #697891;
  animation: loading-turn 4s linear infinite;
}
.map-loading p {
  font: 16px var(--serif);
  letter-spacing: 3px;
}
.experiment-modal {
  width: 1160px;
  max-width: calc(100vw - 55px);
  height: min(760px, 90dvh);
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.experiment-header {
  padding: 18px 27px;
  border-bottom: 1px solid #eef3ff;
  display: flex;
  align-items: center;
  gap: 17px;
  flex-shrink: 0;
}
.experiment-header h2 {
  font-size: 22px;
}
.experiment-header .modal-eyebrow {
  margin: 0;
}
.experiment-header .modal-close {
  position: static;
  margin-left: auto;
}
.experiment-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  flex: 1;
  min-height: 0;
}
.experiment-stage {
  position: relative;
  background: #f8faff;
  min-height: 0;
  overflow: hidden;
}
.experiment-stage canvas {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
}
.experiment-side {
  padding: 22px 23px;
  overflow-y: auto;
  border-left: 1px solid #eef3ff;
  background: #f8faff;
}
.experiment-side h3 {
  font: 600 19px var(--serif);
  margin-bottom: 5px;
}
.experiment-side p {
  font-size: 11px;
  color: #697891;
  line-height: 1.8;
}
.control-group {
  margin: 22px 0;
}
.control-group label {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  margin-bottom: 9px;
  align-items: center;
}
.control-group label > span {
  color: #526b94;
  font-variant-numeric: tabular-nums;
}
.control-group input[type="range"] {
  width: 100%;
  accent-color: #526b94;
  height: 5px;
  cursor: pointer;
}
.control-group input[type="number"] {
  width: 66px;
  background: #ffffff;
  border: 1px solid #eef3ff;
  padding: 3px 6px;
  border-radius: 3px;
  font-size: 11px;
  color: #526b94;
}
.pill-row {
  display: flex;
  gap: 7px;
  flex-wrap: wrap;
  margin: 10px 0;
}
.pill {
  border: 1px solid #dfe8fa;
  border-radius: 4px;
  padding: 6px 10px;
  font-size: 11px;
}
.pill.active {
  background: #eef3ff;
  border-color: #697891;
  color: #667a9d;
}
.experiment-feedback {
  padding: 12px;
  background: #f8faff;
  border-left: 2px solid #bdcbea;
  font-size: 11px;
  line-height: 1.9;
  margin: 17px 0;
  color: #526b94;
}
.experiment-feedback.success {
  background: #e0ead9;
  border-color: #8b9c6e;
  color: #56704d;
}
.experiment-side .quiz-box {
  padding: 12px;
  margin-top: 17px;
}
.experiment-side .quiz-box h3 {
  font: 12px var(--sans);
}
.experiment-side .quiz-option {
  font-size: 10px;
  padding: 8px;
}
.experiment-side .quiz-feedback {
  font-size: 10px;
}
.experiment-return {
  display: flex;
  align-items: center;
  gap: 6px;
  justify-content: center;
  font-size: 11px;
  margin-top: 15px;
  width: 100%;
  color: #526b94;
}
.stage-caption {
  position: absolute;
  top: 20px;
  left: 25px;
  z-index: 2;
  font: 11px var(--sans);
  letter-spacing: 1px;
  color: #697891;
  pointer-events: none;
}
.stage-formula {
  position: absolute;
  bottom: 23px;
  left: 0;
  width: 100%;
  text-align: center;
  font:
    italic 24px Georgia,
    var(--serif);
  color: #526b94;
  pointer-events: none;
}
.atom-picker {
  display: flex;
  gap: 9px;
  margin: 17px 0;
}
.atom-picker button {
  width: 39px;
  height: 39px;
  border: 2px solid transparent;
  border-radius: 50%;
  font: 600 16px Georgia;
  box-shadow: 0 3px 5px #40577720;
}
.atom-picker button.active {
  outline: 2px solid #bdcbea;
  outline-offset: 3px;
}
.atom-C {
  background: #667a9d;
  color: #ffffff;
}
.atom-N {
  background: #bdcbea;
  color: #ffffff;
}
.atom-O {
  background: #8c9fc5;
  color: #ffffff;
}
.atom-H {
  background: #ffffff;
  color: #526b94;
}
.molecule-instructions {
  position: absolute;
  bottom: 18px;
  left: 0;
  width: 100%;
  text-align: center;
  font-size: 11px;
  color: #697891;
  pointer-events: none;
}
.molecule-shape {
  position: absolute;
  right: 20px;
  top: 18px;
  padding: 8px 13px;
  border: 1px solid #eef3ff;
  background: #ffffff99;
  border-radius: 4px;
  color: #526b94;
  font-size: 11px;
}
.route-banner {
  font-size: 11px;
  color: #526b94;
  padding: 10px;
  border: 1px solid #eef3ff;
  background: #f8faff;
  margin-bottom: 14px;
}
.route-navigation {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}
.route-navigation button {
  padding: 7px 12px;
  border: 1px solid #dfe8fa;
  border-radius: 3px;
  font-size: 10px;
}
.mobile-note {
  display: none;
}
.history-pin .node-pin {
  background: #bdcbea;
}
.index-empty {
  font-size: 12px;
  color: #526b94;
  padding: 12px;
}
.progress-info {
  font-size: 11px;
  color: #526b94;
  margin-top: 22px;
}
.history-mode .island-name {
  filter: sepia(0.3);
}
.world-art.fallback-art {
  opacity: 0.9;
}
body.dragging * {
  cursor: grabbing !important;
}
.map-intro h1,
.map-intro p {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.map-intro .eyebrow {
  font-size: 9px;
  letter-spacing: 2px;
  color: #667a9d;
}
.map-intro:after {
  content: "世界全图 · 自由探索";
  display: block;
  font-size: 11px;
  letter-spacing: 2px;
  color: #667a9d;
  margin-top: 5px;
}
.chemistry-name {
  top: 850px;
}
.accessible-bonds {
  display: flex;
  gap: 5px;
  align-items: center;
  flex-wrap: wrap;
  margin: 10px 0;
}
.accessible-bonds select {
  width: 90px;
  border: 1px solid #eef3ff;
  border-radius: 3px;
  background: #ffffff;
  padding: 4px;
  font-size: 10px;
}
.accessible-bonds button {
  font-size: 10px;
  border: 1px solid #eef3ff;
  padding: 4px 7px;
  border-radius: 3px;
}
.molecule-controls-label {
  font-size: 10px;
  color: #526b94;
  margin-top: 12px;
}
.map-node.minor .node-pin svg {
  width: 9px;
  height: 9px;
}
@keyframes panel-in {
  from {
    opacity: 0;
    transform: translateX(12px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}
@keyframes loading-turn {
  to {
    transform: rotate(360deg);
  }
}
@media (min-width: 1650px) {
  .node-panel {
    width: 320px;
    top: 130px;
  }
  .panel-art {
    height: 150px;
  }
  .panel-content {
    padding: 12px 25px 25px;
  }
  .panel-content h2 {
    font-size: 29px;
  }
  .panel-description {
    font-size: 13px;
  }
  .map-intro {
    top: 35px;
    left: 40px;
  }
  .map-intro h1 {
    font-size: 30px;
  }
  .quest-card {
    left: 36px;
    bottom: 35px;
  }
}
@media (max-width: 1100px) {
  .topbar {
    padding: 0 20px;
    gap: 12px;
  }
  .brand strong {
    font-size: 23px;
  }
  .brand-compass {
    font-size: 53px;
  }
  .brand small {
    font-size: 7px;
    letter-spacing: 1.6px;
  }
  .subjects button {
    padding: 9px 13px;
  }
  .header-actions {
    gap: 9px;
  }
  .journal-button > span:not([data-icon]) {
    display: none;
  }
  .map-intro h1 {
    font-size: 21px;
  }
  .map-intro p {
    font-size: 10px;
  }
  .map-view-switch {
    left: 54%;
  }
  .map-tools .paper-tool span:not([data-icon]) {
    display: none;
  }
  .node-panel {
    width: 255px;
    right: 20px;
    top: 96px;
  }
  .panel-art {
    height: 100px;
  }
  .panel-content {
    padding: 8px 17px 16px;
  }
  .panel-content h2 {
    font-size: 23px;
  }
  .quest-card {
    width: 310px;
    padding: 14px;
    left: 20px;
  }
  .quest-card h3 {
    font-size: 15px;
  }
  .map-hint {
    display: none;
  }
  .experiment-body {
    grid-template-columns: minmax(0, 1fr) 270px;
  }
  .experiment-side {
    padding: 18px;
  }
  .panel-relations {
    margin-top: 10px;
    padding-top: 10px;
  }
}
@media (max-width: 700px) {
  .topbar {
    height: 116px;
    flex-wrap: wrap;
    align-content: center;
    row-gap: 9px;
    padding: 9px 16px;
  }
  .brand {
    gap: 8px;
  }
  .brand-compass {
    font-size: 42px;
  }
  .brand strong {
    font-size: 22px;
  }
  .brand small {
    font-size: 6px;
    margin-top: 3px;
  }
  .header-actions {
    margin-left: auto;
  }
  .subjects {
    order: 3;
    width: 100%;
    justify-content: center;
    padding: 2px;
  }
  .subjects button {
    flex: 1;
    padding: 5px 9px;
    font-size: 11px;
  }
  .subjects button:first-child {
    flex: 1.3;
  }
  .journal-button {
    gap: 6px;
  }
  .header-divider {
    display: none;
  }
  .map-stage {
    height: calc(100dvh - 152px);
  }
  .map-intro {
    left: 17px;
    top: 16px;
  }
  .map-intro h1 {
    font-size: 19px;
  }
  .map-intro p {
    display: none;
  }
  .map-intro .eyebrow {
    font-size: 7px;
    letter-spacing: 1.6px;
  }
  .map-view-switch {
    top: 80px;
    left: 16px;
    transform: none;
    padding: 3px;
  }
  .map-view-switch button {
    padding: 6px 10px;
    font-size: 10px;
  }
  .map-tools {
    top: 18px;
    right: 15px;
    gap: 5px;
  }
  .paper-tool {
    padding: 8px;
  }
  .quest-card {
    left: 14px;
    bottom: 17px;
    width: 245px;
    padding: 12px;
    gap: 9px;
  }
  .quest-card .quest-emblem {
    width: 32px;
    height: 32px;
  }
  .quest-card .quest-emblem svg {
    width: 23px !important;
    height: 23px !important;
  }
  .quest-card .eyebrow {
    font-size: 8px;
  }
  .quest-card h3 {
    font-size: 12px;
  }
  .quest-card p {
    display: none;
  }
  .quest-card > button {
    padding: 0;
  }
  .navigation-tools {
    right: 13px;
    bottom: 16px;
    gap: 0;
  }
  .compass-reset {
    width: 46px;
    height: 54px;
  }
  .compass-reset > span {
    font-size: 51px;
  }
  .zoom-controls button {
    width: 27px;
    height: 25px;
    font-size: 19px;
  }
  .zoom-controls span {
    font-size: 8px;
    width: 24px;
  }
  .bottom-bar {
    height: 36px;
    padding: 0 15px;
    font-size: 8px;
  }
  .bottom-bar > span:nth-child(2) {
    display: none;
  }
  .exploration-progress {
    margin-left: 0;
    margin-right: auto;
    gap: 9px;
  }
  .progress-track {
    width: 65px;
  }
  .bottom-bar > button {
    font-size: 9px;
  }
  .node-panel {
    right: 13px;
    left: 13px;
    top: auto;
    bottom: 104px;
    width: auto;
    max-height: 46%;
    display: grid;
    grid-template-columns: 95px minmax(0, 1fr);
  }
  .node-panel .panel-art {
    height: 100%;
    min-height: 140px;
    border-radius: 8px 0 0 8px;
  }
  .panel-art img {
    object-fit: cover;
  }
  .panel-art:after {
    background: linear-gradient(90deg, transparent, #f8faff);
  }
  .panel-tag {
    left: 7px;
    font-size: 8px;
    bottom: 12px;
    letter-spacing: 1px;
  }
  .panel-content {
    padding: 14px;
  }
  .panel-content h2 {
    font-size: 20px;
    margin-bottom: 2px;
  }
  .panel-question {
    font-size: 10px;
    margin-bottom: 8px;
  }
  .panel-description,
  .panel-relations {
    display: none;
  }
  .panel-content .primary-button {
    padding: 7px;
    font-size: 11px;
  }
  .panel-content .secondary-button {
    padding: 6px;
    font-size: 10px;
    margin-top: 5px;
  }
  .panel-close {
    right: 5px;
    top: 5px;
  }
  .search-popover {
    top: 112px;
    left: 12px;
    right: 12px;
    width: auto;
  }
  .modal-backdrop {
    padding: 13px;
  }
  .modal {
    padding: 27px 21px;
    max-height: 90dvh;
  }
  .modal h2 {
    font-size: 24px;
  }
  .modal .modal-close {
    right: 12px;
    top: 12px;
  }
  .journal-list {
    grid-template-columns: 1fr;
  }
  .place-index {
    grid-template-columns: 1fr;
  }
  .place-index h3 {
    margin: 15px 0 5px;
  }
  .place-index button {
    padding: 10px;
  }
  .experiment-modal {
    max-width: 100%;
    height: 90dvh;
    padding: 0;
  }
  .experiment-header {
    padding: 15px;
    gap: 10px;
  }
  .experiment-header h2 {
    font-size: 17px;
  }
  .experiment-header .modal-eyebrow {
    font-size: 8px;
  }
  .experiment-body {
    display: flex;
    flex-direction: column;
    overflow: auto;
  }
  .experiment-stage {
    height: 310px;
    flex-shrink: 0;
    min-height: 310px;
  }
  .experiment-side {
    border-left: 0;
    border-top: 1px solid #eef3ff;
    overflow: visible;
    padding: 20px;
  }
  .stage-formula {
    font-size: 19px;
  }
  .stage-caption {
    left: 15px;
    top: 14px;
    font-size: 9px;
  }
  .mobile-note {
    display: block !important;
    font-size: 10px;
    color: #526b94;
    margin-top: 8px;
  }
  .map-node.minor .node-label {
    font-size: 11px;
  }
  .toast {
    bottom: 49px;
    font-size: 11px;
    width: max-content;
    max-width: 90%;
  }
  .route-card {
    padding: 12px;
  }
  .route-card p {
    font-size: 10px;
  }
  .route-card h3 {
    font-size: 12px;
  }
  .route-card button {
    font-size: 10px;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *:before,
  *:after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}