:root{
  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;

  --color-bg: #ffffff;
  --color-text: #111111;
  --color-text-secondary: #444444;
  --color-text-muted: #666666;
  --color-border: #e6e6e6;

  --color-us: #1f5cff;
  --color-china: #d24040;

  --color-primary: #111111;
  --color-primary-dark: #000000;

  --nav-width: 72px;
  --layer-sidebar-width: 320px;
}

*{box-sizing:border-box;}
html,body{height:100%;}
body{
  margin:0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a{color:inherit; text-decoration:none;}
a:focus{outline:2px solid #000; outline-offset:2px;}

.content-wrapper{
  margin-left: var(--nav-width);
}

/* Sidebar dots nav */
.sidebar{
  position: fixed;
  top:0;
  left:0;
  width: var(--nav-width);
  height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  z-index: 50;
}
.sidebar-track{
  position:absolute;
  left:50%;
  transform: translateX(-50%);
  width:2px;
  height: calc(100vh - 80px);
  background: var(--color-border);
  top:40px;
}
.sidebar-progress{
  position:absolute;
  left:50%;
  transform: translateX(-50%);
  width:2px;
  height: 0;
  background: var(--color-text);
  top:40px;
}
.nav-dots{
  display:flex;
  flex-direction:column;
  gap:18px;
  position: relative;
}
.nav-dot{
  width:10px;
  height:10px;
  border-radius: 999px;
  border:1px solid var(--color-text);
  background: transparent;
  position: relative;
}
.nav-dot.active{background: var(--color-text);} 
.nav-dot .tooltip{
  position:absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  background: #fff;
  border: 1px solid var(--color-border);
  padding:6px 10px;
  font-size: 12px;
  white-space: nowrap;
  opacity:0;
  pointer-events:none;
}
.nav-dot:hover .tooltip{opacity:1;}

/* Top nav */
.top-nav{
  position: fixed;
  top:0;
  left:0;
  right:0;
  height: 60px;
  display:flex;
  align-items:center;
  justify-content: space-between;
  padding: 0 22px;
  background: rgba(255,255,255,0.96);
  border-bottom: 1px solid var(--color-border);
  transform: translateY(-100%);
  transition: transform 180ms ease;
  z-index: 40;
}
.top-nav.visible{transform: translateY(0);}
.top-nav-brand{
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: 0.02em;
}
.top-nav-links{display:flex; align-items:center; gap:18px;}
.top-nav-link{
  font-size: 13px;
  color: var(--color-text-secondary);
  cursor:pointer;
  user-select:none;
}
.top-nav-link:hover{color: var(--color-text);} 

.layer-dropdown{position:relative;}
.dropdown-trigger{
  display:flex;
  align-items:center;
  gap:8px;
}
.dropdown-trigger svg{width:16px; height:16px;}
.dropdown-menu{
  position:absolute;
  top: 36px;
  right: 0;
  min-width: 240px;
  background:#fff;
  border: 1px solid var(--color-border);
  padding: 8px;
  display:none;
}
.layer-dropdown.open .dropdown-menu{display:block;}
.dropdown-item{
  display:block;
  padding: 10px 10px;
  border-radius: 6px;
  font-size: 13px;
  color: var(--color-text-secondary);
}
.dropdown-item:hover{background:#f6f6f6; color: var(--color-text);} 

/* Title page */
.title-page{
  min-height: 100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 80px 20px;
}
.title-content{max-width: 900px; text-align:center; padding: 0 20px;}
.title-main{
  font-family: var(--font-serif);
  font-size: clamp(44px, 7vw, 84px);
  margin:0 0 18px;
  letter-spacing: -0.02em;
}
.title-subtitle{
  margin:0 auto 16px;
  max-width: 720px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  font-size: 16px;
}
.title-date{margin:0; color: var(--color-text-muted); font-size: 13px;}

.scroll-indicator{
  position:absolute;
  bottom: 34px;
  left: calc(var(--nav-width) + 50%);
  transform: translateX(-50%);
  width: 34px;
  height: 34px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
}
.scroll-arrow{
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--color-text);
  border-bottom: 2px solid var(--color-text);
  transform: rotate(45deg);
  margin-top: -2px;
}

/* Stack section */
.stack-section{
  padding: 84px 20px 90px;
  border-top: 1px solid var(--color-border);
}
.stack-title{
  font-family: var(--font-serif);
  font-size: 40px;
  margin: 0 0 10px;
  text-align:center;
}
.stack-description{
  margin: 0 auto 36px;
  max-width: 780px;
  text-align:center;
  color: var(--color-text-secondary);
  line-height: 1.7;
}
.stack-container{
  max-width: 1120px;
  margin: 0 auto;
  display:grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  padding: 0 10px;
}
.layer-card{
  position: relative;
  border: 1px solid var(--color-border);
  padding: 18px 18px;
  display:grid;
  grid-template-columns: 72px 1fr auto auto;
  align-items:center;
  gap: 18px;
  background: #fff;
}
.layer-card:hover{border-color:#bdbdbd;}

.layer-thumb{
  width: 72px;
  height: 56px;
  border: 1px solid var(--color-border);
  background: #fff;
}
.layer-info{min-width: 0;}
.layer-name{
  font-family: var(--font-serif);
  margin:0 0 6px;
  font-size: 22px;
}
.layer-measure{margin:0; color: var(--color-text-muted); font-size: 13px; line-height: 1.4;}
.layer-preview{
  display:flex;
  align-items:flex-end;
  gap: 6px;
  height: 54px;
  flex: 0 0 auto;
}
.mini-bar{
  width: 12px;
  border-radius: 2px;
  background: #999;
}
.mini-bar.us{background: var(--color-us);} 
.mini-bar.china{background: var(--color-china);} 

.layer-leader{
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  white-space: nowrap;
  flex: 0 0 auto;
}
.layer-leader.us{color: var(--color-us);} 
.layer-leader.china{color: var(--color-china);} 

/* Summary */
.summary-section{
  padding: 84px 20px 90px;
  border-top: 1px solid var(--color-border);
}
.summary-header{text-align:center; max-width: 820px; margin: 0 auto;}
.summary-title{font-family: var(--font-serif); font-size: 40px; margin:0 0 10px;}
.summary-subtitle{margin:0 0 28px; color: var(--color-text-secondary); line-height: 1.7;}

.score-totals{
  display:flex;
  justify-content:center;
  gap: 18px;
  flex-wrap: wrap;
  margin: 0 auto 26px;
}
.score-card{
  border: 1px solid var(--color-border);
  padding: 18px 18px;
  min-width: 240px;
  text-align:center;
}
.score-number{
  font-family: var(--font-serif);
  font-size: 56px;
  line-height: 1;
  margin-bottom: 10px;
}
.score-number.us{color: var(--color-us);} 
.score-number.china{color: var(--color-china);} 
.score-label{color: var(--color-text-muted); font-size: 13px;}

/* Contributors */
.contributors-section{
  padding: 84px 20px 110px;
  border-top: 1px solid var(--color-border);
}
.contributors-title{font-family: var(--font-serif); font-size: 40px; text-align:center; margin:0 0 24px;}
.contributors-grid{display:flex; justify-content:center; flex-wrap:wrap; gap:10px;}
.contributor-tag{
  border: 1px solid var(--color-border);
  padding: 10px 12px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* Layer pages */
/* OLD LAYER SIDEBAR STYLES - DEPRECATED (using new sidebar from sidebar_fourth.css) */
.layer-page{display:none;} /* Hidden - using .layer-layout now */
.layer-sidebar{display:none;} /* Hidden - using .layer-sidebar-new now */
.layer-feed{display:none;} /* Hidden - using .layer-content-new now */
.sidebar-content{display:none;}
.layer-title{display:none;}
.layer-navigation{display:none;}
.nav-btn{display:none;}
.measure-section{display:none;}
.measure-label{display:none;}
.measure-value{display:none;}
.podium-container{display:none;}
.podium-title{display:none;}
.podium{display:none;}
.podium-column{display:none;}
.podium-score{display:none;}
.podium-bar{display:none;}
.podium-label{display:none;}
.podium-footer{display:none;}
.podium-note{display:none;}
.feed-header{display:none;}
.feed-title{display:none;}
.feed-description{margin:0; color: var(--color-text-secondary); line-height: 1.8;}

/* Layer editorial content (inside the main feed) */
.layer-hero{
  padding: 10px 0 22px;
  border-bottom: 1px solid var(--color-border);
}
.layer-hero__title{
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 500;
  margin: 0 0 8px;
}
.layer-hero__lede{
  margin: 0;
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 820px;
}

.layer-formulas{
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
  max-width: 900px;
}
.layer-formula{
  border: 1px solid var(--color-border);
  background: #fff;
  padding: 12px 14px;
}
.layer-formula__title{
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}
.layer-formula__text{
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin: 0;
}

.layer-section{
  padding: 22px 0;
  border-bottom: 1px solid var(--color-border);
}
.layer-section__title{
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 500;
  margin: 0 0 10px;
}
.layer-section__text{
  margin: 0;
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 900px;
}

.layer-grid-2{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 14px;
}
.layer-card-min{
  border: 1px solid var(--color-border);
  background: #fff;
  padding: 14px;
}
.layer-card-min__title{
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 500;
  margin: 0 0 6px;
}
.layer-card-min__body{
  margin: 0;
  color: var(--color-text-secondary);
  line-height: 1.7;
  font-size: 14px;
}

.layer-callout{
  margin-top: 14px;
  border-left: 3px solid var(--color-border);
  padding: 10px 14px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.layer-callout__link{
  text-decoration: underline;
  text-underline-offset: 3px;
}

.layer-callout__link:hover{
  color: var(--color-text);
}

@media (max-width: 860px){
  .layer-formulas{grid-template-columns: 1fr;}
  .layer-grid-2{grid-template-columns: 1fr;}
}

.feed-item{border-top: 1px solid var(--color-border); padding: 18px 0;}
.feed-item h3{margin: 0 0 8px; font-size: 18px; font-weight: 600;}
.feed-item p{margin:0; color: var(--color-text-secondary); line-height: 1.8;}
.feed-meta{display:flex; gap: 10px; margin-top: 10px; font-size: 12px; color: var(--color-text-muted); align-items:center;}
.feed-tag{border: 1px solid var(--color-border); padding: 4px 8px; font-size: 11px; color: var(--color-text-secondary);} 

.isotype-section{border-top: 1px solid var(--color-border); padding-top: 22px; margin-top: 22px;}
.isotype-title{margin:0 0 6px; font-size: 14px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--color-text-muted);} 
.isotype-subtitle{margin:0; color: var(--color-text-secondary); font-size: 13px;}
.isotype-grid{display:flex; flex-wrap:wrap; gap: 6px;}
.isotype-legend{margin-top: 14px; font-size: 12px; color: var(--color-text-muted);} 
.legend-item{display:flex; align-items:center; gap: 10px; justify-content:flex-start;}
.legend-icon{width: 22px; height: 22px;}

/* Collapsed layer sidebar */
body.sidebar-collapsed .layer-sidebar{
  width: 0;
  padding: 18px 0;
  overflow: hidden;
  border-right: 1px solid var(--color-border);
}
body.sidebar-collapsed .layer-feed{max-width: 1060px;}

/* Responsive */
@media (max-width: 980px){
  .stack-container{grid-template-columns: 1fr;}
  .layer-card{
    grid-template-columns: 64px 1fr;
    grid-template-rows: auto auto;
    align-items: start;
  }
  .layer-thumb{width: 64px; height: 48px;}
  .layer-preview{grid-column: 2; justify-self: start;}
  .layer-leader{grid-column: 2; justify-self: start; margin-top: 2px;}
}



/* Footer */
.site-footer{
  border-top: 1px solid var(--color-border);
  padding: 40px 22px 60px;
}
.footer-content{
  max-width: 1100px;
  margin: 0 auto;
  display:flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
  text-align: center;
}
.footer-brand{
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: 0.02em;
}
.footer-links{
  display:flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content:center;
}
.footer-link{
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  border-bottom: 1px solid transparent;
}
.footer-link:hover{border-bottom-color: currentColor;}
.footer-copy{
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.mobile-overlay{display:none;}

/* ============================================================
   EDIT MODE
   ============================================================ */

/* Edit toggle button */
.edit-toggle {
    position: fixed;
    bottom: 32px;
    right: 32px;
    padding: 14px 28px;
    background-color: var(--color-text);
    color: #ffffff;
    border: none;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    z-index: 1000;
    transition: background-color 0.15s ease;
}

.edit-toggle:hover {
    background-color: #000000;
}

.edit-toggle--active {
    background-color: var(--color-primary);
}

.edit-toggle--active:hover {
    background-color: var(--color-primary-dark);
}

/* Editable elements */
.editable {
    cursor: pointer;
    position: relative;
    transition: outline 0.1s ease;
}

.editable:hover {
    outline: 3px dashed var(--color-primary);
    outline-offset: 8px;
}

/* Edit overlay */
.edit-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease;
}

.edit-overlay--open {
    opacity: 1;
    visibility: visible;
}

/* Edit panel */
.edit-panel {
    position: fixed;
    top: 0;
    right: 0;
    width: 480px;
    max-width: 100vw;
    height: 100vh;
    background-color: #ffffff;
    border-left: 1px solid var(--color-border);
    z-index: 1002;
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.2s ease;
}

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

.edit-panel__header {
    padding: 28px 32px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.edit-panel__title {
    font-family: var(--font-sans);
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-text);
}

.edit-panel__close {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--color-text-light);
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.edit-panel__close:hover {
    color: var(--color-text);
}

.edit-panel__body {
    flex: 1;
    padding: 32px;
    overflow-y: auto;
}

.edit-panel__footer {
    padding: 24px 32px;
    border-top: 1px solid var(--color-border);
    display: flex;
    gap: 12px;
}

/* Form elements */
.form-group {
    margin-bottom: 28px;
}

.form-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 10px;
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--color-border);
    font-family: var(--font-sans);
    font-size: 1rem;
    color: var(--color-text);
    background-color: #ffffff;
    transition: border-color 0.15s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-textarea {
    min-height: 120px;
    resize: vertical;
    line-height: 1.6;
}

.form-row {
    display: flex;
    gap: 20px;
}

.form-row .form-group {
    flex: 1;
}

.form-hint {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: 8px;
}

/* Buttons */
.btn {
    padding: 14px 28px;
    border: none;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.btn--primary {
    background-color: var(--color-primary);
    color: #ffffff;
    flex: 1;
}

.btn--primary:hover {
    background-color: var(--color-primary-dark);
}

.btn--secondary {
    background-color: var(--color-bg);
    color: var(--color-text);
}

.btn--secondary:hover {
    background-color: var(--color-border);
}

.btn--danger {
    background-color: #dc3545;
    color: #ffffff;
}

.btn--danger:hover {
    background-color: #c82333;
}

.btn--small {
    padding: 10px 18px;
    font-size: 0.9rem;
}

/* List items in edit panel */
.edit-list {
    list-style: none;
    margin-bottom: 16px;
}

.edit-list__item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 18px;
    background-color: var(--color-bg);
    margin-bottom: 8px;
    font-size: 1rem;
}

.edit-list__item-name {
    color: var(--color-text);
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 100px;
    right: 32px;
    padding: 16px 32px;
    background-color: var(--color-text);
    color: #ffffff;
    font-size: 1rem;
    z-index: 1003;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.2s ease, transform 0.2s ease;
}

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

/* Color input */
.form-color {
    width: 60px;
    height: 44px;
    padding: 4px;
    border: 2px solid var(--color-border);
    cursor: pointer;
    background: #ffffff;
}

.form-color:focus {
    outline: none;
    border-color: var(--color-primary);
}

/* ------------------------------------------------------------
   UTILITY
   ------------------------------------------------------------ */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Embedded metric explorers inside layer pages */
.layer-embed{
  margin-top: 24px;
  border: 1px solid var(--color-border);
  background: #fff;
}
.layer-embed__header{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
}
.layer-embed__title{
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.layer-embed__open{
  font-size: 12px;
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.layer-embed__open:hover{border-bottom-color: var(--color-text);}
.layer-embed__frame{
  width: 100%;
  height: min(78vh, 820px);
  border: 0;
  display: block;
  background: #fff;
}

/* ------------------------------------------------------------
   STACK FLOW DIAGRAM
   ------------------------------------------------------------ */
.stack-flow-container {
  max-width: 1400px;
  margin: 60px auto;
  padding: 0 40px;
}

.stack-flow-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 60px;
  margin-bottom: 80px;
}

.stack-flow-row--inputs {
  gap: 80px;
  margin-bottom: 60px;
}

.stack-flow-row--pipeline {
  gap: 40px;
  margin-bottom: 60px;
}

.stack-flow-row--foundation {
  justify-content: center;
  margin-bottom: 80px;
}

/* Critical Minerals - absolute positioned closer to pipeline */
.stack-flow-item--critical {
  position: absolute !important;
  bottom: 20px;
  left: 160px;
}

.stack-flow-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  cursor: pointer;
  transition: transform 0.2s ease, opacity 0.2s ease;
  position: relative;
}

.stack-flow-item:hover {
  transform: translateY(-4px);
}

.stack-flow-item--conceptual {
  opacity: 0.5;
  cursor: default;
}

.stack-flow-item--conceptual:hover {
  transform: none;
}

.stack-flow-item--flanking {
  opacity: 0.85;
}

.stack-flow-item--foundation {
  width: 160px;
}

.stack-flow-icon {
  width: 80px;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-border);
  border-radius: 12px;
  background: #ffffff;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.stack-flow-item:hover .stack-flow-icon {
  border-color: var(--color-text);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.stack-flow-icon img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
}

.stack-flow-placeholder-icon {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.05em;
}

.stack-flow-label {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  text-align: center;
  max-width: 140px;
  line-height: 1.3;
  color: var(--color-text);
}

/* Layer popup */
.layer-popup {
  position: fixed;
  background: #ffffff;
  border: 2px solid var(--color-text);
  border-radius: 12px;
  padding: 24px;
  min-width: 320px;
  max-width: 420px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  z-index: 1000;
  pointer-events: none;
}

.layer-popup-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.layer-popup-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0;
  color: var(--color-text);
}

.layer-popup-measure {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.4;
}

.layer-popup-scores {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 8px 0;
}

.popup-score {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px;
  border-radius: 6px;
  background: #f9f9f9;
}

.popup-score--us {
  border-left: 3px solid var(--color-us);
}

.popup-score--china {
  border-left: 3px solid var(--color-china);
}

.popup-score-label {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.popup-score-value {
  font-family: var(--font-sans);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-text);
}

.layer-popup-description {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin: 8px 0 0;
}

.layer-popup-hint {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 8px;
  font-style: italic;
}

/* SVG ARROW STRATEGY
   All arrows drawn using SVG for perfect positioning
   Box dimensions: 80px icon + 12px gap + 40px label = 132px total
   Margins: 10px from box edges
*/

.stack-flow-container {
  position: relative;
}

/* SVG overlay for all arrows - hidden */
.arrow-svg {
  display: none;
}

/* Responsive adjustments - maintain arrow positioning at all breakpoints */
@media (max-width: 1400px) {
  .stack-flow-row {
    gap: 50px;
  }

  .stack-flow-row--inputs {
    gap: 60px;
  }

  .stack-flow-row--pipeline {
    gap: 35px;
  }

  /* Horizontal arrows: 35px gap - 20px margins = 15px */
  .stack-flow-row--pipeline .stack-flow-item:not(:last-child)::after {
    width: 15px;
  }

  .stack-flow-row--pipeline .stack-flow-item:not(:last-child)::before {
    left: calc(100% + 25px);
  }
}

@media (max-width: 1200px) {
  .stack-flow-container {
    padding: 0 20px;
  }

  .stack-flow-row {
    gap: 40px;
  }

  .stack-flow-row--inputs {
    gap: 50px;
  }

  .stack-flow-row--pipeline {
    gap: 30px;
  }

  /* Horizontal arrows: 30px gap - 20px margins = 10px */
  .stack-flow-row--pipeline .stack-flow-item:not(:last-child)::after {
    width: 10px;
  }

  .stack-flow-row--pipeline .stack-flow-item:not(:last-child)::before {
    left: calc(100% + 20px);
  }
}

@media (max-width: 1024px) {
  .stack-flow-row {
    gap: 30px;
  }

  .stack-flow-row--inputs {
    gap: 40px;
  }

  .stack-flow-row--pipeline {
    gap: 25px;
  }

  /* Horizontal arrows: 25px gap - 20px margins = 5px */
  .stack-flow-row--pipeline .stack-flow-item:not(:last-child)::after {
    width: 5px;
  }

  .stack-flow-row--pipeline .stack-flow-item:not(:last-child)::before {
    left: calc(100% + 15px);
  }
}

@media (max-width: 900px) {
  /* Hide arrows when layout wraps */
  .stack-flow-item::after,
  .stack-flow-item::before {
    display: none !important;
  }

  .stack-flow-row {
    flex-wrap: wrap;
    gap: 30px;
  }

  .stack-flow-icon {
    width: 70px;
    height: 70px;
  }

  .stack-flow-label {
    font-size: 0.85rem;
  }
}