/* ============================================================
   视觉记号系统
   ------------------------------------------------------------
   这套配色不是从任何框架的默认调色板来的, 是从这个站自己的内容推出来的:

   · 底色取暖中性的近黑, 不取蓝灰 —— 蓝灰 slate 梯度是"通用深色技术站"
     最强的辨识特征, 换掉它比换任何单个色都管用。
   · 主强调色 = 测量网格的颜色。盒计数是本站的核心论点, 网格线、
     读数、拟合线共用一个色, 让"这是一台仪器"这件事由配色本身承载。
   · 第二色 = 与真值吻合时的绿。它只在"测准了"的场合出现, 是语义色不是装饰色。
   · 标题用衬线 —— 数学该读起来像纸, 不像应用界面。且全部走系统字体,
     不依赖任何 CDN 字体, 离线也不掉版。
   ============================================================ */
:root {
  --ground:   #14120f;   /* 纸背 */
  --panel:    #1c1a16;   /* 面板 */
  --panel-2:  #24211c;   /* 面板(浅一档) */
  --rule:     #38332b;   /* 细线 */
  --rule-2:   #4a4438;   /* 细线(强) */
  --ink:      #ece7dd;   /* 正文最亮 */
  --ink-2:    #b8b0a2;   /* 正文 */
  --ink-3:    #8a8377;   /* 次要/说明 */
  --measure:  #d97742;   /* 测量: 网格·读数·拟合线 */
  --measure-d:#b8683a;
  --truth:    #6f9068;   /* 与真值吻合 */
  --warn:     #c9973f;   /* 偏差已到量级 */
  --cool:     #6f8fa8;   /* 次要数据 */

  --serif: Georgia, 'Songti SC', 'Noto Serif CJK SC', 'Source Han Serif SC', 'STSong', serif;
  --sans:  system-ui, -apple-system, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --mono:  ui-monospace, SFMono-Regular, Menlo, Consolas, 'Liberation Mono', monospace;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* 旧变量层保留别名, 全部指向上面的记号, 避免两套并存 */
  --primary-color:   var(--measure);
  --secondary-color: var(--measure-d);
  --accent-color:    var(--truth);
  --bg-dark:         var(--ground);
  --bg-card:         var(--panel);
  --text-primary:    var(--ink);
  --text-secondary:  var(--ink-3);
  --border-color:    var(--rule);
}

body {
  font-family: var(--sans);
  background-color: var(--ground);
  /* 极淡的测量网格。盒计数是本站的核心论点, 让网格当页面的底纹,
     而不是随便找一张装饰性纹理。48px 一格, 透明度低到不干扰阅读。 */
  background-image:
    linear-gradient(to right,  rgba(217, 119, 66, .045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(217, 119, 66, .045) 1px, transparent 1px);
  background-size: 48px 48px;
  background-attachment: fixed;
  color: var(--ink-2);
  line-height: 1.7;
  overflow-x: hidden;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(20, 18, 15, 0.95);
  backdrop-filter: blur(10px);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo {
  width: 2.5rem;
  height: 2.5rem;
  background: var(--measure);
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: bold;
}

.title {
  font-size: 1.1rem;
  font-weight: 600;
}

.nav-links {
  display: flex;
  gap: 0.5rem;
}

.nav-btn {
  position: relative;
  padding: 0.5rem 0.85rem 0.6rem;
  background: transparent;
  border: none;
  border-bottom: 1px solid transparent;
  color: var(--ink-3);
  border-radius: 0;
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.nav-btn:hover { color: var(--ink); border-bottom-color: var(--rule-2); }

/* 当前项用一段实线标出, 像仪器面板上的刻度指示, 而不是填色胶囊 */
.nav-btn.active {
  color: var(--measure);
  border-bottom-color: var(--measure);
}
.nav-btn.active::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -1px;
  width: 1px; height: 5px;
  background: var(--measure);
  transform: translateX(-50%);
}

.mobile-menu-btn {
  display: none;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

.mobile-menu {
  display: none;
  position: fixed;
  top: 4.5rem;
  left: 0;
  right: 0;
  background: rgba(20, 18, 15, 0.98);
  backdrop-filter: blur(10px);
  flex-direction: column;
  padding: 1rem;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

main {
  padding-top: 4.5rem;
}

.section {
  display: none;
  padding: 4rem 2rem;
  min-height: calc(100vh - 4.5rem);
  animation: fadeIn 0.4s ease-out;
}

.section.active {
  display: block;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
  animation: slideDown 0.5s ease-out;
}

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

.section-header h2 {
  font-family: var(--serif);
  font-size: 2.35rem;
  font-weight: 400;
  letter-spacing: .01em;
  margin-bottom: .9rem;
  color: var(--ink);
}

.section-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* 旧的左文右图两栏首屏已废弃, 见文末 .hero-plate */

.hero-content {
  text-align: left;
  padding-right: 2rem;
}

.hero-content h1 {
  font-size: 2.75rem;
  margin-bottom: 1.5rem;
  line-height: 1.2;
}

.subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
  line-height: 1.6;
}

.cta-btn {
  padding: 1rem 2rem;
  background: var(--measure);
  color: white;
  border: none;
  border-radius: 2px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s, box-shadow 0.2s;
}

.cta-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(217, 119, 66, 0.3);
}

.disclaimer {
  margin-top: 2rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-style: italic;
}

.hero-visual {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

#three-container {
  width: 100%;
  height: 560px;
  border-radius: 2px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

#three-container canvas {
  display: block;
}

.three-controls {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1rem;
  pointer-events: auto;
  z-index: 10;
}

.param-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.param-group:last-child {
  margin-bottom: 0;
}

.param-group label {
  min-width: 80px;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.param-group input[type="range"] {
  flex: 1;
}

.param-group span {
  min-width: 50px;
  text-align: right;
  font-family: var(--mono);
  font-size: 0.875rem;
}

.control-btn {
  width: 100%;
  padding: 0.625rem 1rem;
  background: var(--measure);
  color: white;
  border: none;
  border-radius: 2px;
  cursor: pointer;
  font-size: 0.875rem;
  font-weight: 600;
  transition: opacity 0.2s;
  margin-top: 0.5rem;
}

.control-btn:hover {
  opacity: 0.9;
}

.interaction-hint {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.75rem;
}

.pattern-buttons {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.pattern-btn {
  padding: 0.5rem 1rem;
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: 2px;
  cursor: pointer;
  font-size: 0.875rem;
  transition: all 0.2s;
}

.pattern-btn.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.pattern-btn:hover {
  border-color: var(--primary-color);
  color: var(--text-primary);
}

.parameter-controls {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.param-group input[type="range"] {
  width: 120px;
}

.param-group span {
  color: var(--accent-color);
  font-weight: bold;
  min-width: 40px;
}

.interaction-hint {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
}

.control-btn {
  display: block;
  margin: 0 auto;
  padding: 0.5rem 1.5rem;
  background: transparent;
  border: 1px solid var(--rule-2);
  color: var(--ink-2);
  border-radius: 2px;
  cursor: pointer;
  font-size: 0.875rem;
  backdrop-filter: blur(4px);
}

.problems-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.problem-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  padding: 2rem;
  transition: transform 0.2s, border-color 0.2s;
}

.problem-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary-color);
}

.problem-icon {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.problem-card h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.problem-card .year {
  color: var(--accent-color);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

.problem-card p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.problem-card ul {
  list-style: none;
  padding-left: 0;
}

.problem-card li {
  color: var(--text-secondary);
  padding-left: 1.25rem;
  position: relative;
  margin-bottom: 0.5rem;
}

.problem-card li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-color);
}

.experiment-container {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.canvas-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  padding: 1rem;
}

#canvas2d {
  width: 100%;
  height: 400px;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.control-group {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  padding: 1rem;
}

.control-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.control-group input[type="range"] {
  width: 100%;
  margin-bottom: 0.5rem;
}

.control-group select {
  width: 100%;
  padding: 0.5rem;
  background: var(--bg-dark);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 0.25rem;
}

.stats {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem;
  background: var(--bg-card);
  border-radius: 2px;
}

.stat-label {
  color: var(--text-secondary);
}

.stat-value {
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--accent-color);
}

.definition-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  margin-bottom: 3rem;
}

.definition-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  padding: 2rem;
}

.definition-card h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  color: var(--accent-color);
}

.math-block {
  background: var(--bg-dark);
  border-radius: 2px;
  padding: 1rem;
  margin-top: 1rem;
}

.math-block p {
  margin-bottom: 0.5rem;
  font-family: var(--serif);
}

.delta-experiment {
  max-width: 800px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  padding: 2rem;
}

.delta-experiment h3 {
  margin-bottom: 1rem;
}

.delta-experiment p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

#deltaCanvas {
  width: 100%;
  height: 300px;
  margin-bottom: 1.5rem;
}

.delta-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.toggle-group {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
}

.toggle-btn {
  padding: 0.5rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  border-radius: 2px;
  cursor: pointer;
  transition: all 0.2s;
}

.toggle-btn.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.proof-steps {
  max-width: 900px;
  margin: 0 auto;
}

.proof-step {
  display: flex;
  gap: 2rem;
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.step-number {
  width: 3rem;
  height: 3rem;
  background: var(--measure);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
}

.step-content h3 {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.layer-content {
  color: var(--text-secondary);
}

.timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
  transform: translateX(-50%);
}

.timeline-item {
  display: flex;
  gap: 2rem;
  margin-bottom: 3rem;
  position: relative;
}

.timeline-item:nth-child(odd) {
  flex-direction: row-reverse;
}

.timeline-year {
  width: 100px;
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--accent-color);
  text-align: center;
  flex-shrink: 0;
}

.timeline-content {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  padding: 1.5rem;
  max-width: calc(50% - 1rem);
}

.timeline-content h3 {
  margin-bottom: 0.5rem;
}

.timeline-content p {
  color: var(--text-secondary);
}

.open-problems {
  max-width: 800px;
  margin: 3rem auto 0;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  padding: 2rem;
}

.open-problems h3 {
  margin-bottom: 1rem;
  color: var(--accent-color);
}

.open-problems ul {
  list-style: none;
  padding-left: 0;
}

.open-problems li {
  padding-left: 1.5rem;
  position: relative;
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
}

.open-problems li::before {
  content: '❓';
  position: absolute;
  left: 0;
}

.sources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.source-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  padding: 2rem;
}

.source-card h3 {
  margin-bottom: 1rem;
  color: var(--accent-color);
}

.source-card ul {
  list-style: none;
  padding-left: 0;
}

.source-card li {
  padding-left: 1.25rem;
  position: relative;
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.source-card li::before {
  content: '📄';
  position: absolute;
  left: 0;
}

.dimension-container,
.multi-scale-container,
.wave-packet-container {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  margin-bottom: 2rem;
}

.dimension-canvas-wrapper,
.scale-canvas-wrapper,
.wave-canvas-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  padding: 1rem;
}

/* #dimensionCanvas 已移出: 维数测量仪改用 .meter-panel canvas 的 1:1 规则,
   ID 选择器会以更高优先级压掉它 */
#scaleCanvas,
#waveCanvas {
  width: 100%;
  height: 400px;
}

.dimension-controls,
.scale-controls,
.wave-controls {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.dimension-stats,
.scale-stats,
.wave-stats {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.dimension-theory,
.scale-theory,
.wave-theory {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 2px;
  padding: 2rem;
}

.dimension-theory h3,
.scale-theory h3,
.wave-theory h3 {
  margin-bottom: 1rem;
  color: var(--accent-color);
}

.dimension-theory p,
.scale-theory p,
.wave-theory p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.dimension-theory code,
.scale-theory code,
.wave-theory code {
  background: var(--bg-dark);
  padding: 0.25rem 0.5rem;
  border-radius: 0.25rem;
  font-family: var(--mono);
}

footer {
  text-align: center;
  padding: 2rem;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 0.875rem;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .mobile-menu.active {
    display: flex;
  }
  
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 2rem;
    min-height: auto;
    padding: 2rem 0;
  }
  
  .hero-content {
    padding-right: 0;
  }
  
  .hero-content h1 {
    font-size: 2rem;
  }
  
  .hero-content p {
    font-size: 1rem;
  }
  
  #three-container {
    height: 350px;
  }
  
  .parameter-controls {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .param-group {
    width: 100%;
  }
  
  .param-group input[type="range"] {
    flex: 1;
  }
  
  .experiment-container {
    grid-template-columns: 1fr;
  }
  
  .proof-step {
    flex-direction: column;
  }
  
  .timeline::before {
    left: 50px;
  }
  
  .timeline-item {
    flex-direction: column !important;
    align-items: flex-start;
  }
  
  .timeline-year {
    width: 100px;
    text-align: left;
  }
  
  .timeline-content {
    max-width: 100%;
    margin-left: 120px;
  }
  
  .section-header h2 {
    font-size: 1.75rem;
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: 0.75rem 1rem;
  }
  
  .section {
    padding: 2rem 1rem;
  }
  
  .hero-content h1 {
    font-size: 1.5rem;
  }
  
  #three-container {
    height: 300px;
  }
  
  .nav-btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
  }
  
  .pattern-buttons {
    gap: 0.25rem;
  }
  
  .pattern-btn {
    padding: 0.4rem 0.6rem;
    font-size: 0.75rem;
  }
  
  .param-group {
    flex-direction: column;
    gap: 0.25rem;
  }
  
  input[type="range"] {
    width: 100%;
  }
}

/* 触摸优化 */
@media (hover: none) {
  .nav-btn:hover {
    background: transparent;
    color: var(--ink-3);
    border-color: transparent;
  }
  
  /* 触屏下也保持刻度式指示, 不退回填色胶囊 */
  .nav-btn:active,
  .nav-btn.active {
    background: transparent;
    color: var(--measure);
    border-color: transparent;
    border-bottom-color: var(--measure);
  }
  
  .pattern-btn:hover {
    background: transparent;
  }
  
  .pattern-btn:active,
  .pattern-btn.active {
    background: var(--primary-color);
    color: white;
  }
}

/* 滚动条美化 */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}

/* 选中文字颜色 */
::selection {
  background: var(--primary-color);
  color: white;
}

/* 输入框样式 */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  background: var(--border-color);
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--primary-color);
  border-radius: 50%;
  cursor: pointer;
  transition: transform 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--primary-color);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}
/* GitHub star link — the visitor clicks it themselves */
.gh-star {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .45rem .85rem;
  margin-right: .75rem;
  border: 1px solid #4a4438;
  border-radius: .5rem;
  background: #1c2130;
  color: #b8b0a2;
  font-size: .82rem;
  text-decoration: none;
  transition: background .15s, border-color .15s, color .15s;
}
.gh-star:hover {
  background: #262c3d;
  border-color: #d97742;
  color: #fff;
}
.gh-star svg { flex: none; }
@media (max-width: 820px) { .gh-star span { display: none; } }

.hint {
  margin-top: .75rem;
  font-size: .78rem;
  line-height: 1.55;
  color: #8a8377;
}

/* Star prompt — appears once, after the visitor has actually explored. */
.star-prompt {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 999;
  width: min(21rem, calc(100vw - 3rem));
  padding: 1.1rem 1.2rem 1rem;
  border: 1px solid #4a4438;
  border-radius: .85rem;
  background: linear-gradient(180deg, #1b2030 0%, #171b28 100%);
  box-shadow: 0 18px 40px rgba(0, 0, 0, .45);
  animation: starPromptIn .35s ease-out;
}
@keyframes starPromptIn {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
.star-prompt[hidden] { display: none; }
.star-prompt-close {
  position: absolute; top: .45rem; right: .6rem;
  border: 0; background: none; color: #8a8377;
  font-size: 1.15rem; line-height: 1; cursor: pointer; padding: .2rem;
}
.star-prompt-close:hover { color: #b8b0a2; }
.star-prompt-title { font-size: .93rem; font-weight: 600; color: #ece7dd; margin-bottom: .4rem; }
.star-prompt-text  { font-size: .8rem; line-height: 1.6; color: #8a8377; margin: 0 0 .9rem; }
.star-prompt-actions { display: flex; align-items: center; gap: .6rem; }
.star-prompt-btn {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .45rem .8rem; border-radius: .5rem;
  background: #d97742; color: #fff; font-size: .82rem;
  text-decoration: none; transition: background .15s;
}
.star-prompt-btn:hover { background: #c06636; }
.star-prompt-later {
  border: 0; background: none; color: #8a8377;
  font-size: .8rem; cursor: pointer; padding: .45rem .2rem;
}
.star-prompt-later:hover { color: #8a8377; }

/* ============================================================
   维数测量仪
   ============================================================ */
.meter-lead {
  max-width: 78ch;
  margin: 0 auto 2rem;
  color: #b8b0a2;
  line-height: 1.85;
}
.meter-lead p { margin: 0 0 .85rem; }
.meter-lead em { color: #d8d1c4; font-style: italic; }
.meter-lead strong { color: #ece7dd; }

.meter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-bottom: 1.25rem;
}
@media (max-width: 860px) { .meter-grid { grid-template-columns: 1fr; } }

.meter-panel {
  background: #1c1a16;
  border: 1px solid #38332b;
  border-radius: 2px;
  padding: 1rem 1rem 1.1rem;
}
.panel-title {
  font-size: .82rem;
  letter-spacing: .04em;
  color: #8a8377;
  margin-bottom: .7rem;
  font-family: var(--mono);
}
.meter-panel canvas {
  display: block;
  width: 100%;
  /* 集合本身是正方形网格; 用宽矩形画布会让左右各留一大块空白 */
  aspect-ratio: 1 / 1;
  height: auto;
  min-height: 300px;
  border-radius: 2px;
  background: #14120f;
}
.panel-note {
  margin: .7rem 0 0;
  font-size: .84rem;
  line-height: 1.65;
  color: #8a8377;
  min-height: 2.6em;
}

.meter-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.6rem;
  align-items: flex-end;
  padding: 1rem 1.15rem;
  background: #1c1a16;
  border: 1px solid #38332b;
  border-radius: 2px;
  margin-bottom: 1.1rem;
}
.meter-controls .control-group { display: flex; flex-direction: column; gap: .4rem; }
.meter-controls label { font-size: .82rem; color: #8a8377; }
.meter-controls select {
  background: #14120f;
  color: #d8d1c4;
  border: 1px solid #4a4438;
  border-radius: 2px;
  padding: .45rem .6rem;
  font-size: .88rem;
  min-width: 15rem;
}
.check-inline {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-size: .88rem;
  color: #b8b0a2;
  cursor: pointer;
}

.meter-readout {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: .75rem;
  margin-bottom: 1.1rem;
}
@media (max-width: 760px) { .meter-readout { grid-template-columns: repeat(2, 1fr); } }
.readout-item {
  background: #1c1a16;
  border: 1px solid #38332b;
  border-radius: 2px;
  padding: .8rem .9rem;
  text-align: center;
}
.readout-item.accent { border-color: #d97742; }
.readout-label { display: block; font-size: .76rem; color: #8a8377; margin-bottom: .35rem; }
.readout-value {
  display: block;
  font-size: 1.28rem;
  font-family: var(--mono);
  color: #d8d1c4;
}
.readout-value.good { color: #6f9068; }
.readout-value.warn { color: #c9973f; }
.readout-value.bad  { color: #d97742; }

.verdict-card {
  border-radius: 2px;
  padding: 1.05rem 1.25rem;
  margin-bottom: 2.2rem;
  line-height: 1.8;
  font-size: .95rem;
  border-left: 4px solid;
  background: #1c1a16;
  color: #b8b0a2;
}
.verdict-card.good { border-color: #6f9068; }
.verdict-card.warn { border-color: #c9973f; }
.verdict-card.bad  { border-color: #d97742; }
.verdict-card strong { color: #ece7dd; }
.verdict-card em { font-style: italic; color: #d8d1c4; }

.meter-theory { max-width: 82ch; margin: 0 auto; color: #b8b0a2; line-height: 1.85; }
.meter-theory h3 {
  color: #ece7dd;
  font-size: 1.12rem;
  margin: 2rem 0 .8rem;
  padding-bottom: .45rem;
  border-bottom: 1px solid #38332b;
}
.meter-theory h3:first-child { margin-top: 0; }
.meter-theory p { margin: 0 0 .9rem; }
.meter-theory strong { color: #ece7dd; }
.meter-theory em { font-style: italic; color: #d8d1c4; }
.math-line {
  text-align: center;
  padding: .9rem;
  margin: 1rem 0;
  background: #14120f;
  border: 1px solid #38332b;
  border-radius: 2px;
}
.finding-list { margin: 0 0 1rem; padding-left: 1.3rem; }
.finding-list li { margin-bottom: .5rem; }
.caveat {
  font-size: .89rem;
  color: #8a8377;
  background: #14120f;
  border: 1px solid #38332b;
  border-radius: 2px;
  padding: .85rem 1rem;
}

.matrix-wrap { overflow-x: auto; margin: 1rem 0; }
.bias-matrix {
  width: 100%;
  min-width: 32rem;
  border-collapse: collapse;
  font-size: .89rem;
  font-family: var(--mono);
}
.bias-matrix th, .bias-matrix td {
  padding: .55rem .7rem;
  text-align: right;
  border-bottom: 1px solid #38332b;
}
.bias-matrix th:first-child, .bias-matrix td:first-child {
  text-align: left;
  font-family: inherit;
}
.bias-matrix thead th { color: #8a8377; font-weight: 500; border-bottom-color: #4a4438; }
.bias-matrix td.ok  { color: #6f9068; }
.bias-matrix td.mid { color: #c9973f; }
.bias-matrix td.bad { color: #d97742; }
.bias-matrix tr.highlight td { background: rgba(217,119,66,.09); }
.bias-matrix tr.highlight td:first-child { color: #ece7dd; font-weight: 600; }
.matrix-read { font-size: .91rem; color: #8a8377; }
.matrix-read strong { color: #d8d1c4; }

.scale-compare { margin: 1.1rem 0 1.3rem; }
.compare-row {
  display: grid;
  grid-template-columns: 16rem 1fr 4rem;
  align-items: center;
  gap: .9rem;
  margin-bottom: .6rem;
  font-size: .89rem;
}
@media (max-width: 700px) { .compare-row { grid-template-columns: 1fr; gap: .3rem; } }
.compare-label { color: #8a8377; }
.compare-bar { height: 12px; background: #14120f; border-radius: 6px; overflow: hidden; }
.compare-bar > span { display: block; height: 100%; background: #6f9068; }
.compare-bar.wide > span { background: #d97742; }
.compare-num {
  font-family: var(--mono);
  color: #d8d1c4;
  text-align: right;
}

/* ============================================================
   致谢与延伸阅读
   ============================================================ */
.credits-block {
  max-width: 82ch;
  margin: 2.5rem auto 0;
  color: #b8b0a2;
  line-height: 1.85;
}
.credits-block h3 {
  color: #ece7dd;
  font-size: 1.12rem;
  margin: 2rem 0 .8rem;
  padding-bottom: .45rem;
  border-bottom: 1px solid #38332b;
}
.credits-block > p { margin: 0 0 1rem; }
.credits-block strong { color: #ece7dd; }
.credits-block em { font-style: italic; color: #d8d1c4; }

.credit-list { display: flex; flex-direction: column; gap: 1rem; margin-bottom: 1.5rem; }
.credit-item {
  background: #1c1a16;
  border: 1px solid #38332b;
  border-left: 3px solid #6f9068;
  border-radius: 2px;
  padding: 1rem 1.15rem;
}
.credit-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem;
  margin-bottom: .55rem;
}
.credit-head a { color: #ece7dd; font-weight: 600; text-decoration: none; font-size: 1rem; }
.credit-head a:hover { color: #d97742; text-decoration: underline; }
.credit-tag {
  font-size: .72rem;
  padding: .15rem .55rem;
  border-radius: 999px;
  background: rgba(217,119,66,.16);
  color: #d97742;
  border: 1px solid rgba(217,119,66,.4);
  white-space: nowrap;
}
.credit-item p { margin: 0 0 .6rem; font-size: .92rem; }
.credit-item p:last-child { margin-bottom: 0; }
.credit-item a { color: #6f8fa8; }
.credit-note {
  font-size: .88rem;
  color: #8a8377;
  background: #14120f;
  border-radius: 2px;
  padding: .7rem .85rem;
}
.jump-link { color: #d97742; text-decoration: none; border-bottom: 1px dashed rgba(217,119,66,.55); }
.jump-link:hover { border-bottom-style: solid; }

.sources-grid .source-card ul li { margin-bottom: .6rem; line-height: 1.7; }
.sources-grid .source-card a { color: #6f8fa8; }

/* 三维面板: 方向覆盖度量 */
.gap-meter {
  margin-top: .9rem;
  padding: .75rem .9rem;
  background: #14120f;
  border: 1px solid #38332b;
  border-left: 3px solid #d97742;
  border-radius: 2px;
}
.gap-head { display: flex; align-items: baseline; justify-content: space-between; gap: .8rem; }
.gap-label { font-size: .82rem; color: #8a8377; }
.gap-value {
  font-size: 1.35rem;
  font-family: var(--mono);
  color: #d97742;
}
.gap-note { margin: .45rem 0 0; font-size: .81rem; line-height: 1.6; color: #8a8377; }

/* ============================================================
   证明地图 — 图示板
   ============================================================ */
.proof-board {
  max-width: 62rem;
  margin: 0 auto 2rem;
  background: #1c1a16;
  border: 1px solid #38332b;
  border-radius: 2px;
  padding: 1.2rem 1.4rem 1.4rem;
}
.board-title {
  font-size: 1rem;
  color: #ece7dd;
  font-weight: 600;
  margin-bottom: .9rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid #38332b;
}
.proof-svg {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 1rem;
  background: #14120f;
  border-radius: 2px;
  padding: .4rem 0;
}
.proof-svg text { font-family: var(--sans); }
.svg-cap   { font-size: 14px; fill: #d8d1c4; font-weight: 600; }
.svg-sub   { font-size: 12.5px; fill: #b8b0a2; }
.svg-tiny  { font-size: 11.5px; fill: #8a8377; }
.svg-num   { font-size: 13px; fill: #d97742; font-family: var(--mono); }
.svg-eq    { font-size: 13.5px; fill: #d8d1c4; font-family: var(--mono); }
.svg-box-t { font-size: 14.5px; fill: #ece7dd; font-weight: 600; }
.svg-cite  { font-size: 11px; fill: #8a8377; font-family: var(--mono); }

.proof-board .layer-content { color: #b8b0a2; line-height: 1.85; }
.proof-board .layer-content p { margin: 0 0 .8rem; }
.proof-board .layer-content p:last-child { margin-bottom: 0; }
.proof-board .layer-content strong { color: #ece7dd; }
.proof-caveat {
  font-size: .88rem;
  color: #8a8377;
  background: #14120f;
  border-radius: 2px;
  padding: .8rem .95rem;
}
.proof-caveat strong { color: #b8b0a2 !important; }

/* ============================================================
   仪表化: 覆盖若干沿用应用界面语汇的地方
   ============================================================ */

/* 标题层级统一走衬线; 正文与读数不变(读数是等宽) */
h1, h2, h3, .board-title, .panel-title, .credit-head a {
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: .01em;
}
h1 { letter-spacing: 0; }
.board-title, .panel-title { font-size: 1.02rem; }

/* 面板: 方角 + 细线, 去掉卡片投影 */
.meter-panel, .proof-board, .credit-item, .readout-item, .verdict-card,
.source-card, .definition-card, .problem-card, .meter-controls {
  box-shadow: none;
  border-radius: 2px;
  background: var(--panel);
  border: 1px solid var(--rule);
}

/* 按钮: 键帽而非填色药丸 */
.cta-btn, .control-btn, .pattern-btn, .toggle-btn, .gh-star {
  border-radius: 2px;
  font-family: var(--sans);
  letter-spacing: .02em;
}
.pattern-btn, .toggle-btn {
  background: transparent;
  border: 1px solid var(--rule-2);
  color: var(--ink-3);
}
.pattern-btn:hover, .toggle-btn:hover { color: var(--ink); border-color: var(--ink-3); }
.pattern-btn.active, .toggle-btn.active {
  background: transparent;
  border-color: var(--measure);
  color: var(--measure);
}

/* 读数一律等宽, 并让数字对齐 */
.readout-value, .stat-value, .gap-value, .compare-num, .bias-matrix td {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
}

/* 导航条: 一条实线把它和内容分开, 像面板的上沿 */
.navbar {
  border-bottom: 1px solid var(--rule);
  background: rgba(20, 18, 15, .93);
  backdrop-filter: blur(6px);
}

/* 章节标题下的小注: 用刻度线起头 */
.section-header p {
  color: var(--ink-3);
  font-size: .95rem;
}
.section-header {
  border-bottom: 1px solid var(--rule);
  padding-bottom: 1.2rem;
  margin-bottom: 2.2rem;
}

/* 正文可读性: 暖白而非纯白, 行距放宽 */
p { color: var(--ink-2); }
strong { color: var(--ink); }
a { color: var(--measure); }
a:hover { color: var(--ink); }

/* ============================================================
   首屏 — 图版式(plate)布局
   ------------------------------------------------------------
   不用"左边一段话 + 右边一张图"的通栏首屏: 那是产品落地页的语汇。
   这里按论文里一幅图版的结构排 —— 标题、状态读数、装置本体、
   横向控制轨、图注。装置横贯整幅, 因为它是主角而不是配图。
   ============================================================ */
.hero-plate {
  max-width: 74rem;
  margin: 0 auto;
  padding: 1rem 0 2rem;
}

.plate-head { margin-bottom: 1.6rem; }
.plate-label {
  font-family: var(--mono);
  font-size: .74rem;
  letter-spacing: .18em;
  color: var(--ink-3);
  margin: 0 0 .9rem;
}
.plate-head h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.9rem, 4.2vw, 3rem);
  line-height: 1.25;
  color: var(--ink);
  margin: 0 0 .8rem;
}
.plate-head .subtitle {
  font-size: 1.02rem;
  color: var(--ink-2);
  /* ch 以 "0" 的宽度为准, 而 CJK 字宽约为其两倍 —— 用 ch 限宽会把中文行
     截得过早(54ch 时"完整维数"被单独甩到次行)。这里按实际字号给绝对宽度。 */
  max-width: 46em;
  margin: 0;
}

/* 状态读数条: 把首屏的空白换成真信息 */
.plate-status {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--rule);
  border-radius: 2px;
  margin-bottom: 1.6rem;
  background: var(--panel);
}
@media (max-width: 760px) { .plate-status { grid-template-columns: repeat(2, 1fr); } }
.status-cell {
  padding: .8rem 1rem;
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: .18rem;
}
.status-cell:last-child { border-right: none; }
@media (max-width: 760px) {
  .status-cell:nth-child(2n) { border-right: none; }
  .status-cell:nth-child(-n+2) { border-bottom: 1px solid var(--rule); }
}
.status-k { font-family: var(--mono); font-size: .74rem; color: var(--ink-3); letter-spacing: .08em; }
.status-v { font-family: var(--mono); font-size: 1.24rem; color: var(--ink); }
.status-v.ok { color: var(--truth); }
.status-v.open { color: var(--measure); }
.status-n { font-size: .78rem; color: var(--ink-3); }

/* 装置本体 */
.plate-figure { margin: 0; }
.figure-frame {
  position: relative;
  border: 1px solid var(--rule);
  border-radius: 2px;
  background: var(--panel);
  padding: 1.6rem 1rem .6rem;
}
.frame-tag {
  position: absolute;
  top: .5rem; left: .8rem;
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--ink-3);
}
#three-container { width: 100%; height: 460px; }
.figure-frame .interaction-hint {
  text-align: center;
  font-size: .78rem;
  color: var(--ink-3);
  margin: .5rem 0 0;
}

/* 横向控制轨: 仪器面板下沿那一条 */
.plate-rail {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .9rem 1.8rem;
  padding: .85rem 1rem;
  border: 1px solid var(--rule);
  border-top: none;
  background: var(--panel-2);
}
.rail-group { display: flex; align-items: center; gap: .6rem; }
.rail-k { font-family: var(--mono); font-size: .76rem; color: var(--ink-3); letter-spacing: .05em; white-space: nowrap; }
.rail-v { font-family: var(--mono); font-size: .88rem; color: var(--measure); min-width: 3.2em; }
.plate-rail .pattern-buttons { display: flex; gap: .4rem; flex-wrap: wrap; }
.plate-rail .pattern-btn { padding: .3rem .6rem; font-size: .8rem; }
.plate-rail input[type=range] { width: 8rem; }
.plate-rail .control-btn { width: auto; margin: 0; padding: .32rem .8rem; font-size: .8rem; }

/* 图注 */
.plate-caption {
  border: 1px solid var(--rule);
  border-top: none;
  padding: .9rem 1rem 1rem;
  background: var(--panel);
}
.caption-reading { display: flex; align-items: baseline; gap: .7rem; }
.reading-k { font-family: var(--mono); font-size: .78rem; color: var(--ink-3); letter-spacing: .06em; }
.reading-v { font-family: var(--mono); font-size: 1.5rem; color: var(--measure); }
.reading-note { margin: .35rem 0 0; font-size: .84rem; color: var(--ink-2); line-height: 1.65; }
.plate-caption .disclaimer {
  margin: .7rem 0 0;
  padding-top: .7rem;
  border-top: 1px solid var(--rule);
  font-size: .8rem;
  color: var(--ink-3);
  font-style: normal;
}

.hero-plate .cta-btn {
  margin-top: 1.6rem;
  padding: .65rem 1.5rem;
  background: transparent;
  border: 1px solid var(--measure);
  color: var(--measure);
  font-size: .95rem;
}
.hero-plate .cta-btn:hover { background: var(--measure); color: var(--ground); }