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:root {
  --app-topbar-height: 0px;
  --font-hans: "Source Han Sans SC";
  --ink: #111418;
  --paper: #f1f3f2;
  --muted: #9aa1a4;
  --panel: #161b21;
  --panel-2: #242a31;
  --signal: #f05443;
  --cyan: #62d8ff;
  --amber: #ffcc66;
  --line: rgba(255, 255, 255, 0.16);

  /* 亮色主题 token（试点：学习主页，后续逐页替换硬编码颜色） */
  /* 中性层次：页面底 → 卡片 → 内嵌块 */
  --bg-page: #f5f7fb;
  --bg-card: #ffffff;
  --bg-inset: #f8fafc;
  --bg-inset-strong: #f1f5f9;
  --border-default: #dbe3ef;
  --border-subtle: #e2e8f0;
  --border-strong: #cbd5e1;
  /* 文本层次 */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-faint: #94a3b8;
  /* 主题蓝：仅用于可交互元素（按钮、链接、选中态） */
  --accent: #2563eb;
  --accent-strong: #1d4ed8;
  --accent-soft: #eff6ff;
  --accent-wash: #f8fbff;
  --accent-border: #bfdbfe;
  --focus-ring: 0 0 0 3px rgba(37, 99, 235, 0.16);
  /* 语义色：仅用于状态表达（完成/进行中/异常） */
  --success: #16a34a;
  --success-strong: #15803d;
  --success-soft: #f0fdf4;
  --warning: #b45309;
  --warning-soft: #fffbeb;
  --danger: #dc2626;
  --danger-strong: #991b1b;
  --danger-soft: #fef2f2;
  /* 卡片投影 */
  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.05), 0 8px 24px rgba(15, 23, 42, 0.04);
  --shadow-card-hover: 0 2px 4px rgba(15, 23, 42, 0.06), 0 12px 28px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-hans), "Microsoft YaHei UI", "Noto Sans SC", "PingFang SC", sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
textarea {
  font: inherit;
}

math-field::part(menu-toggle),
math-field::part(virtual-keyboard-toggle),
body > .ML__keyboard {
  display: none !important;
}

.app-shell {
  min-height: 100vh;
  background: #080b0f;
}

.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--app-topbar-height);
  padding: 18px 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(10, 13, 16, 0.86);
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.brand strong {
  font-size: 18px;
  letter-spacing: 0;
}

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

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.nav-link,
.command-button {
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--paper);
  cursor: pointer;
  padding: 10px 14px;
}

.nav-link:hover,
.command-button:hover {
  border-color: var(--cyan);
}

.command-button.primary {
  border-color: var(--signal);
  background: var(--signal);
  color: white;
}

.command-button:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.page {
  width: min(1440px, 100%);
  margin: 0 auto;
  padding: 32px 28px 56px;
}

.terminal {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  grid-gap: 28px;
  gap: 28px;
  align-items: stretch;
}

.terminal-main,
.terminal-panel,
.lesson-shell,
.dev-panel {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(17, 20, 24, 0.82);
}

.terminal-main {
  min-height: 520px;
  padding: 36px;
  position: relative;
  overflow: hidden;
}

.terminal-main::before {
  content: "";
  position: absolute;
  inset: auto -10% 42px 14%;
  height: 5px;
  background: var(--signal);
  transform: skewX(-28deg);
}

.eyebrow {
  color: var(--cyan);
  font-size: 13px;
  font-weight: 700;
}

h1,
h2,
h3 {
  margin: 0;
  letter-spacing: 0;
}

h1 {
  margin-top: 18px;
  font-size: 68px;
  line-height: 0.96;
}

.terminal-main p,
.terminal-panel p,
.lesson-copy {
  color: #cdd3d5;
  line-height: 1.75;
}

.terminal-panel {
  padding: 28px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-gap: 12px;
  gap: 12px;
  margin-top: 24px;
}

.metric {
  border-left: 3px solid var(--signal);
  background: rgba(255, 255, 255, 0.05);
  padding: 16px;
}

.metric strong {
  display: block;
  font-size: 28px;
}

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

.status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 86px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  padding: 7px 10px;
  font-size: 12px;
}

.status-pill.ready {
  border-color: var(--signal);
  color: var(--paper);
}

.map-viewport {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 6px;
  background:
    radial-gradient(circle at 10% 30%, rgba(98, 216, 255, 0.14), transparent 30%),
    linear-gradient(180deg, #293037, #161b20);
}

.stage-map {
  display: block;
  min-width: 1200px;
  width: 100%;
  height: auto;
}

.stage-node {
  transition: transform 160ms ease;
}

.stage-node:hover {
  transform: translateY(-4px);
}

.stage-node rect {
  stroke-width: 3;
}

.stage-node.available rect,
.stage-node.cleared rect,
.stage-node.perfect rect {
  fill: #f4f6f4;
  stroke: var(--signal);
}

.stage-node.locked rect,
.stage-node.placeholder rect {
  fill: #5b6166;
  stroke: #777f85;
}

.stage-node text {
  fill: var(--ink);
  font-size: 34px;
  font-weight: 800;
  text-anchor: middle;
  dominant-baseline: central;
}

.stage-node.locked text,
.stage-node.placeholder text {
  fill: #d6dadb;
}

.map-toolbar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 18px;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--muted);
  font-size: 13px;
}

.lesson-shell {
  min-height: 650px;
  display: grid;
  grid-template-rows: 1fr auto;
  overflow: hidden;
}

.lesson-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
  grid-gap: 20px;
  gap: 20px;
  padding: 28px;
  background:
    linear-gradient(135deg, rgba(98, 216, 255, 0.12), transparent 40%),
    #111418;
}

.dialogue-area,
.board-area {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.055);
  padding: 24px;
}

.speaker {
  color: var(--amber);
  font-weight: 800;
  margin-bottom: 14px;
}

.operation-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: flex-end;
  border-top: 1px solid var(--line);
  padding: 18px;
  background: rgba(0, 0, 0, 0.22);
}

.answer-area {
  width: 100%;
  min-height: 180px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #0c0f12;
  color: var(--paper);
  padding: 14px;
}

.lesson-page {
  width: 100%;
  max-width: none;
  height: 100vh;
  overflow: hidden;
  padding: 0;
}

.stage-map-page {
  width: 100%;
  height: 100vh;
  overflow: hidden;
}

.vn-shell {
  width: 100%;
  height: 100%;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #050608;
  overflow: hidden;
}

.vn-stage {
  position: relative;
  width: min(100vw, 1920px);
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #050608;
  isolation: isolate;
}

@media (min-aspect-ratio: 16 / 9) {
  .vn-stage {
    width: auto;
    height: 100%;
    max-width: 100%;
  }
}

.vn-background {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  -webkit-user-select: none;
     -moz-user-select: none;
          user-select: none;
}

.vn-character-layer {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.vn-character {
  position: absolute;
  object-fit: contain;
  -webkit-user-select: none;
     -moz-user-select: none;
          user-select: none;
  filter: drop-shadow(0 22px 34px rgba(0, 0, 0, 0.48));
}

.vn-blackboard {
  position: absolute;
  z-index: 2;
  border: 2px solid rgba(215, 229, 220, 0.6);
  background: rgba(19, 37, 31, 0.9);
  box-shadow: inset 0 0 0 4px rgba(255, 255, 255, 0.05), 0 18px 38px rgba(0, 0, 0, 0.38);
  color: #f0f6e6;
  line-height: 1.55;
  overflow: auto;
  overflow-wrap: anywhere;
  padding: 30px 34px;
  white-space: pre-wrap;
}

.vn-blackboard-upperright {
  top: 20px;
  right: 54px;
}

.vn-blackboard-upperleft {
  top: 20px;
  left: 54px;
}

.vn-blackboard-lowerright {
  right: 54px;
  bottom: 430px;
}

.vn-blackboard-lowerleft {
  left: 54px;
  bottom: 430px;
}

.vn-blackboard-center {
  top: 16%;
  left: 50%;
  transform: translateX(-50%);
}

.vn-dialogue-layer {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 3;
  height: 37.8556%;
  background:
    linear-gradient(180deg, rgba(8, 12, 18, 0.2), rgba(8, 12, 18, 0.86) 42%, rgba(8, 12, 18, 0.96)),
    url("/assets/lhgf/LocalTemporaryAssets/lhgf-dialog-gradient.png") center / 100% 100% no-repeat;
  border-top: 1px solid rgba(255, 255, 255, 0.22);
  box-shadow: 0 -24px 38px rgba(0, 0, 0, 0.34);
  padding: 42px 92px 96px;
}

.vn-speaker {
  position: absolute;
  top: 22px;
  left: 92px;
  min-width: 180px;
  border-left: 5px solid #f05443;
  background: rgba(3, 6, 10, 0.72);
  color: #f5d37a;
  font-size: 26px;
  font-weight: 800;
  letter-spacing: 0;
  padding: 8px 18px;
}

.vn-dialogue-text {
  max-width: 1360px;
  min-height: 150px;
  margin-top: 58px;
  color: #f2f5f1;
  font-size: 34px;
  line-height: 1.62;
  overflow-wrap: anywhere;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.7);
  white-space: pre-wrap;
}

.vn-next {
  position: absolute;
  right: 86px;
  bottom: 78px;
  width: 54px;
  height: 54px;
  border: 0;
  background: transparent;
  cursor: pointer;
  opacity: 0.36;
  padding: 0;
}

.vn-next.ready {
  opacity: 1;
  animation: vn-next-pulse 980ms ease-in-out infinite alternate;
}

.vn-next img {
  width: 100%;
  height: 100%;
}

.vn-open-layer,
.vn-result-layer,
.vn-missing-report {
  position: absolute;
  z-index: 5;
  color: #f2f5f1;
}

.vn-open-layer {
  top: 12%;
  left: 50%;
  width: min(1040px, 82%);
  transform: translateX(-50%);
  border: 1px solid rgba(255, 255, 255, 0.24);
  background: rgba(8, 12, 16, 0.9);
  box-shadow: 0 28px 60px rgba(0, 0, 0, 0.52);
  padding: 34px;
}

.vn-open-header span,
.vn-result-layer span,
.vn-missing-report span,
.vn-overlay-header span {
  color: #62d8ff;
  font-size: 14px;
  font-weight: 800;
}

.vn-open-header h2 {
  margin-top: 12px;
  font-size: 30px;
  line-height: 1.45;
}

.vn-open-rubric {
  color: #cdd3d5;
  line-height: 1.7;
}

.vn-open-textarea {
  width: 100%;
  min-height: 260px;
  resize: vertical;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 4px;
  background: #0c0f12;
  color: #f2f5f1;
  line-height: 1.7;
  padding: 16px;
}

.vn-open-actions {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 14px;
  margin-top: 18px;
}

.vn-pending {
  color: #ffcc66;
  font-weight: 800;
}

.vn-overlay {
  position: absolute;
  inset: 0;
  z-index: 8;
  display: grid;
  place-items: center;
  background: rgba(2, 5, 8, 0.68);
}

.vn-overlay-panel {
  width: min(880px, 84%);
  max-height: 72%;
  overflow: auto;
  border: 1px solid rgba(255, 255, 255, 0.26);
  background: rgba(12, 16, 20, 0.96);
  color: #f2f5f1;
  padding: 26px;
}

.vn-overlay-panel.compact {
  width: min(520px, 84%);
}

.vn-overlay-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.vn-record-list {
  display: grid;
  grid-gap: 14px;
  gap: 14px;
}

.vn-record-list article {
  border-left: 3px solid #f05443;
  background: rgba(255, 255, 255, 0.05);
  padding: 14px 16px;
}

.vn-record-list strong {
  color: #f5d37a;
}

.vn-record-list p,
.vn-warning-list p {
  margin: 8px 0 0;
  color: #cdd3d5;
  line-height: 1.65;
}

.vn-warning-list {
  margin-top: 18px;
}

.vn-result-layer,
.vn-missing-report {
  top: 28%;
  left: 50%;
  width: min(720px, 82%);
  transform: translateX(-50%);
  background: rgba(8, 12, 16, 0.86);
  border: 1px solid rgba(255, 255, 255, 0.24);
  padding: 34px;
}

.vn-result-layer h1,
.vn-missing-report h1 {
  margin: 12px 0;
  font-size: 56px;
}

.vn-result-layer p,
.vn-missing-report p {
  color: #cdd3d5;
  line-height: 1.65;
}

@keyframes vn-next-pulse {
  from {
    transform: translateX(0);
  }

  to {
    transform: translateX(8px);
  }
}

.dev-panel {
  padding: 24px;
}

.warning-list {
  display: grid;
  grid-gap: 10px;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.warning-list li {
  border-left: 3px solid var(--amber);
  background: rgba(255, 204, 102, 0.08);
  padding: 12px 14px;
}

@media (max-width: 860px) {
  h1 {
    font-size: 44px;
  }

  .terminal,
  .lesson-stage {
    grid-template-columns: 1fr;
  }

  .vn-stage {
    width: 100%;
    min-height: calc(100vh - var(--app-topbar-height));
    aspect-ratio: auto;
  }

  .vn-character {
    display: none;
  }

  .vn-blackboard {
    top: 18px;
    right: 18px;
    left: 18px;
    width: auto !important;
    height: 38%;
    font-size: 22px !important;
    padding: 18px;
  }

  .vn-dialogue-layer {
    height: 42%;
    padding: 58px 20px 92px;
  }

  .vn-speaker {
    left: 20px;
    font-size: 18px;
  }

  .vn-dialogue-text {
    font-size: 22px;
    min-height: 120px;
  }

  .vn-open-layer {
    top: 16px;
    width: calc(100% - 28px);
    padding: 20px;
  }

}