/* ==========================================================================
   Variables & Theme
   ========================================================================== */
:root {
  /* Colors - Minimal Academic Theme */
  --bg-body: #ffffff;
  --bg-card: #fdfdfd;
  --bg-panel: #f8f9fa;
  --text-main: #1a1a1a;
  --text-muted: #555555;
  --text-light: #777777;

  --color-accent: #2c3e50;
  /* Deep blue/slate */
  --color-accent-light: #ecf0f1;
  --color-highlight: #e74c3c;
  /* Academic red for emphasis */
  --color-link: #2980b9;

  --border-light: #e0e0e0;
  --border-strong: #333333;

  /* Typography */
  --font-serif: 'Spectral', 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --spacing-unit: 1rem;
  --max-width: 800px;
  /* Standard reading width */
  --header-height: 60px;
}

/* ==========================================================================
   Reset & Base Styles
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-body);
  color: var(--text-main);
  font-family: var(--font-serif);
  line-height: 1.7;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--text-main);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  line-height: 1.3;
}

h1 {
  font-size: 2.5rem;
  margin-top: 0;
}

h2 {
  font-size: 1.8rem;
  border-bottom: 2px solid var(--text-main);
  padding-bottom: 0.5rem;
}

h3 {
  font-size: 1.4rem;
  color: var(--color-accent);
  font-style: italic;
}

h4 {
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-sans);
}

p {
  margin-bottom: 1.5rem;
  text-align: justify;
  /* Academic justification */
}

a {
  color: var(--color-link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

a:hover {
  border-bottom-color: var(--color-link);
}

code {
  font-family: var(--font-mono);
  background: var(--bg-panel);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  font-size: 0.9em;
}

ul,
ol {
  margin-bottom: 1.5rem;
  padding-left: 2rem;
}

/* ==========================================================================
   Layout
   ========================================================================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
  position: relative;
}

/* Progress Bar */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 4px;
  background: var(--color-accent);
  width: 0%;
  z-index: 1000;
  transition: width 0.1s;
}

/* ==========================================================================
   Components: TOC
   ========================================================================== */
.toc {
  display: none;
}

@media (min-width: 1200px) {
  .toc {
    display: block;
    position: fixed;
    top: 6rem;
    left: calc(50% - var(--max-width)/2 - 280px);
    width: 240px;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    padding-right: 2rem;
    height: calc(100vh - 10rem);
    overflow-y: auto;
  }

  .toc-title {
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-main);
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 1.5px;
    padding-bottom: 0.75rem;
    border-bottom: 2px solid var(--border-light);
  }

  .toc ul {
    list-style: none;
    padding: 0;
    margin: 0;
  }

  .toc li {
    margin-bottom: 0.75rem;
  }

  .toc a {
    color: var(--text-muted);
    display: block;
    line-height: 1.6;
    transition: all 0.2s ease;
    padding: 0.25rem 0;
    border-left: 2px solid transparent;
    padding-left: 0.75rem;
    margin-left: -0.75rem;
  }

  .toc a:hover {
    color: var(--color-accent);
    border-left-color: var(--color-accent);
    padding-left: 1rem;
    margin-left: -1rem;
  }

  .toc a.active {
    color: var(--color-accent);
    font-weight: 600;
    border-left-color: var(--color-accent);
  }

  /* Smooth scrollbar */
  .toc::-webkit-scrollbar {
    width: 4px;
  }

  .toc::-webkit-scrollbar-track {
    background: transparent;
  }

  .toc::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 2px;
  }

  .toc::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
  }
}

.report-header {
  text-align: center;
  margin-bottom: 4rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-light);
}

.journal-tag {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.authors,
.date {
  font-family: var(--font-sans);
  color: var(--text-muted);
  font-size: 1rem;
  margin: 0.5rem 0;
}

.abstract {
  background-color: var(--bg-panel);
  padding: 2rem;
  border-left: 4px solid var(--color-accent);
  margin-bottom: 3rem;
  font-size: 0.95rem;
}

.abstract h2 {
  font-size: 1rem;
  text-transform: uppercase;
  margin-top: 0;
  border: none;
  font-family: var(--font-sans);
  letter-spacing: 0.05em;
}

/* ==========================================================================
   Grids & Cards
   ========================================================================== */
.two-column-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

@media (min-width: 768px) {
  .two-column-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.info-card {
  border: 1px solid var(--border-light);
  padding: 1.5rem;
  border-radius: 4px;
  /* Minimal radius */
  background: var(--bg-card);
}

.info-card h4 {
  margin-top: 0;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 0.5rem;
}

.info-card ul {
  padding-left: 1.2rem;
  margin-bottom: 0;
}

.info-card li {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
}

/* ==========================================================================
   Visualizations & Canvas
   ========================================================================== */
.chart-container {
  position: relative;
  width: 100%;
  min-height: 400px;
  margin: 2rem 0;
  background: white;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  padding: 1rem;
}

.chart-container.tall {
  min-height: 500px;
}

.simulation-container,
.visual-pes {
  margin: 2.5rem 0;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 20px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.03);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.simulation-container.wide {
  margin-left: -2rem;
  margin-right: -2rem;
  width: calc(100% + 4rem);
}

canvas {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border-light);
  /* Frame the canvas */
  background: white;
}

.caption,
.reaction-caption {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1rem;
  text-align: center;
  border-top: 1px solid var(--border-light);
  padding-top: 0.5rem;
  width: 100%;
}

/* ==========================================================================
   Reaction Diagrams
   ========================================================================== */
.reaction-diagram {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 2rem 0;
  padding: 1rem;
  background: var(--bg-panel);
}

.reaction-step {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
  font-size: 1.2rem;
  font-family: var(--font-sans);
}

.molecule {
  font-weight: 500;
  padding: 0.25rem 0.5rem;
  border: 1px solid transparent;
}

.highlight-a {
  color: var(--color-highlight);
  border-bottom: 2px solid var(--color-highlight);
}

.highlight-b {
  color: var(--color-link);
  border-bottom: 2px solid var(--color-link);
}

.arrow {
  color: var(--text-muted);
}

.or {
  font-style: italic;
  color: var(--text-muted);
  margin: 0 1rem;
  font-size: 0.9rem;
}

/* ==========================================================================
   Comparisons (Earth vs Space)
   ========================================================================== */
.comparison-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin: 2rem 0;
}

@media (min-width: 768px) {
  .comparison-cards {
    grid-template-columns: 1fr 1fr;
  }
}

.comparison-card {
  border: 1px solid var(--border-light);
  border-radius: 4px;
}

.comparison-card.earth {
  border-top: 4px solid #2ecc71;
}

.comparison-card.space {
  border-top: 4px solid #3498db;
}

.comparison-header {
  padding: 1rem;
  background: var(--bg-panel);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}

.comparison-header h4 {
  margin: 0;
  font-size: 1rem;
}

.comparison-icon {
  font-size: 1.2rem;
}

.comparison-content {
  padding: 1rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.comparison-row {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--border-light);
}

.comparison-row:last-child {
  border-bottom: none;
}

.comparison-row.highlight {
  background: rgba(0, 0, 0, 0.02);
  font-weight: 600;
}

.quantum-text {
  color: var(--color-link);
  font-weight: bold;
}

/* ==========================================================================
   Math Blocks
   ========================================================================== */
.math-block {
  overflow-x: auto;
  padding: 1.5rem;
  background: white;
  /* Contrast against grey bg if any */
  text-align: center;
  margin: 1.5rem 0;
  font-family: 'Times New Roman', serif;
  font-size: 1.1rem;
}

.math-block.important {
  border: 1px solid var(--color-accent);
  border-left-width: 4px;
}

.math-block.highlight-bad {
  background-color: #fff5f5;
  border-left: 4px solid var(--color-highlight);
}

.warning-text {
  background: #fff5f5;
  color: #c0392b;
  padding: 1rem;
  border-radius: 4px;
  border-left: 4px solid #c0392b;
}

.insight-box {
  background: #f0f7fb;
  border-left: 4px solid var(--color-link);
  padding: 1.5rem;
  margin: 2rem 0;
}

/* ==========================================================================
   Interactive Controls & Tables
   ========================================================================== */
.molecule-selector {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 1rem;
}

button {
  cursor: pointer;
  font-family: var(--font-sans);
}

.molecule-btn,
.sim-btn {
  background: white;
  border: 1px solid var(--border-strong);
  color: var(--text-main);
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
  transition: all 0.2s;
  border-radius: 2px;
}

.molecule-btn:hover,
.sim-btn:hover {
  background: var(--text-main);
  color: white;
}

.molecule-btn.active {
  background: var(--text-main);
  color: white;
}

.data-table-container {
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--border-light);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.data-table th,
.data-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

.data-table th {
  background: var(--bg-panel);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.5px;
}

.data-table tr.highlight-row {
  background-color: #f8f9fa;
  font-weight: 600;
}

.data-table tr.danger {
  background-color: #fef2f2;
  color: #c0392b;
}

.data-table tr.success {
  background-color: #f0fdf4;
  color: #166534;
}


/* ==========================================================================
   Simulation Panel Styling
   ========================================================================== */
.simulation-controls-panel {
  width: 100%;
  padding: 1rem;
  background: var(--bg-panel);
  margin-top: 1rem;
  border-top: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sim-control-row {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: center;
}

.sim-info {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 4px;
}

.legend-dot.white {
  background: #333;
  border: 1px solid #ccc;
}

/* Inverted for light mode visibility */
.legend-dot.gray {
  background: #7f8c8d;
}

.legend-dot.brown {
  background: #a0522d;
}

/* 3D Viewer special case */
#moleculeViewer3D {
  width: 100%;
  height: 350px;
  background: #f0f0f0;
  /* Light grey bg for 3D model */
  border: 1px solid var(--border-light);
}

.molecule-info {
  margin-top: 1rem;
  text-align: center;
  padding: 1rem;
  border: 1px solid var(--border-light);
  background: var(--bg-card);
}

.mol-props {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 1rem 0;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  flex-wrap: wrap;
}

.prop-label {
  display: block;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.element-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.element-card {
  border: 1px solid var(--border-light);
  padding: 1rem;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s;
  background: var(--bg-card);
}

.element-card:hover {
  border-color: var(--color-accent);
}

.element-symbol {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: bold;
  color: var(--color-accent);
}

.element-number {
  font-size: 0.8rem;
  color: var(--text-muted);
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
}

.element-card {
  position: relative;
}

/* For absolute positioning */

/* ==========================================================================
   Footer & Citations
   ========================================================================== */
section#references {
  margin-top: 4rem;
  border-top: 2px solid var(--text-main);
  padding-top: 2rem;
  font-size: 0.9rem;
}

section#references li {
  margin-bottom: 0.5rem;
  padding-left: 0.5rem;
}

/* ==========================================================================
   Simulation & Terminal Styles
   ========================================================================== */
.simulation-container,
.terminal-container,
.predictor-interface {
  position: relative;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  background: var(--bg-card);
  transition: all 0.3s ease;
  overflow: hidden;
}

/* Highlight interactive sections */
.simulation-container:hover,
.terminal-container:hover,
.predictor-interface:hover {
  border-color: var(--color-link);
  box-shadow: 0 8px 24px rgba(41, 121, 255, 0.12);
  transform: translateY(-2px);
}

.simulation-container::before,
.terminal-container::before,
.predictor-interface::before {
  content: "INTERACTIVE SIMULATION";
  position: absolute;
  top: 0;
  right: 0;
  background: var(--color-accent);
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-bottom-left-radius: 8px;
  z-index: 10;
  pointer-events: none;
  opacity: 0.9;
}

/* Terminal Specifics */
.terminal-container {
  background: #0f1218;
  color: #e8eaed;
  font-family: 'JetBrains Mono', monospace;
  padding: 0;
  min-height: 350px;
}

.terminal-header {
  background: #1a1d24;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid #333;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-dot.red {
  background: #ff5252;
}

.terminal-dot.yellow {
  background: #ffab00;
}

.terminal-dot.green {
  background: #00e676;
}

.terminal-title {
  margin-left: 1rem;
  font-size: 0.8rem;
  color: #9aa0a6;
}

.terminal {
  padding: 1rem;
  height: 300px;
  overflow-y: auto;
  font-size: 0.85rem;
  line-height: 1.4;
}

.terminal-line {
  margin-bottom: 0.3rem;
  display: flex;
  align-items: flex-start;
  font-family: 'JetBrains Mono', monospace;
}

.terminal-line.system {
  color: #9aa0a6;
}

.terminal-line.info {
  color: #00d4ff;
}

.terminal-line.data {
  color: #bdc1c6;
}

.terminal-line.warning {
  color: #ffab00;
}

.terminal-line.error {
  color: #ff5252;
}

.terminal-line.success {
  color: #00e676;
  font-weight: bold;
}

.terminal-line.result {
  color: #e040fb;
  font-weight: bold;
  border-left: 2px solid #e040fb;
  padding-left: 0.5rem;
}

.terminal-cursor {
  display: inline-block;
  color: #00e676;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* Quantum vs Classical Highlights */
.highlight-quantum {
  color: #2979ff;
  font-weight: bold;
}

.highlight-classical {
  color: #ff5252;
  font-weight: bold;
}

/* ==========================================================================
   New Sections: Results, Pathway, Predictor
   ========================================================================== */

/* Results Grid */
.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.result-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 1.5rem;
  text-align: center;
  border-radius: 4px;
}

.result-card.highlight {
  border-color: var(--color-link);
  background: #f0f7fb;
}

.result-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.result-value {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-main);
  font-family: var(--font-mono);
}

.result-unit {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 0.2rem;
}

/* Pathway Diagram */
.pathway-diagram {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 3rem 0;
  padding: 2rem;
  background: var(--bg-panel);
  border-radius: 8px;
}

.pathway-step {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.pathway-molecule {
  background: white;
  border: 1px solid var(--border-strong);
  padding: 0.8rem 1.2rem;
  font-weight: 600;
  border-radius: 4px;
  font-family: var(--font-mono);
}

.pathway-molecule.highlight {
  border-color: var(--color-link);
  color: var(--color-link);
  background: #f0f7fb;
}

.pathway-molecule.success {
  border-color: #27ae60;
  color: #27ae60;
  background: #f0fdf4;
}

.pathway-arrow {
  color: var(--text-muted);
  font-size: 0.9rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0 0.5rem;
}

.pathway-arrow::before {
  content: "→";
  font-size: 1.5rem;
  line-height: 1;
}

.tunneling-arrow {
  color: var(--color-link);
  font-weight: bold;
}

/* Predictor UI */
.predictor-guide {
  background: var(--bg-panel);
  padding: 2rem;
  border-radius: 8px;
  margin-bottom: 3rem;
}

.guide-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
  margin-top: 1.5rem;
}

.guide-step {
  position: relative;
  padding-left: 3.5rem;
}

.step-number {
  position: absolute;
  left: 0;
  top: 0;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--text-main);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-family: var(--font-mono);
}

.predictor-interface {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  padding: 2rem;
  border-radius: 8px;
}

@media (min-width: 900px) {
  .predictor-interface {
    grid-template-columns: 300px 1fr;
  }
}

.input-group {
  margin-bottom: 1.5rem;
}

.input-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  font-size: 0.9rem;
}

.input-group input,
.input-group select {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  font-family: var(--font-mono);
}

.input-hint {
  display: block;
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 0.3rem;
}

.btn-primary {
  background: var(--color-accent);
  color: white;
  border: none;
  padding: 0.8rem 1.5rem;
  border-radius: 4px;
  font-family: var(--font-sans);
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  transition: background 0.2s;
}

.btn-primary:hover {
  background: #1a252f;
}

.abundance-bars {
  min-height: 200px;
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-panel);
  border-radius: 4px;
  margin-top: 1rem;
}

.molecule-btn:hover,
.sim-btn:hover {
  background: var(--text-main);
  color: white;
}

.molecule-btn.active {
  background: var(--text-main);
  color: white;
}

.data-table-container {
  overflow-x: auto;
  margin: 2rem 0;
  border: 1px solid var(--border-light);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-sans);
  font-size: 0.9rem;
}

.data-table th,
.data-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-light);
}

.data-table th {
  background: var(--bg-panel);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.5px;
}

.data-table tr.highlight-row {
  background-color: #f8f9fa;
  font-weight: 600;
}

.data-table tr.danger {
  background-color: #fef2f2;
  color: #c0392b;
}

.data-table tr.success {
  background-color: #f0fdf4;
  color: #166534;
}


/* ==========================================================================
   Simulation Panel Styling
   ========================================================================== */
.simulation-controls-panel {
  width: 100%;
  padding: 1rem;
  background: var(--bg-panel);
  margin-top: 1rem;
  border-top: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.sim-control-row {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: center;
}

.sim-info {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.legend-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  margin-right: 4px;
}

.legend-dot.white {
  background: #333;
  border: 1px solid #ccc;
}

/* Inverted for light mode visibility */
.legend-dot.gray {
  background: #7f8c8d;
}

.legend-dot.brown {
  background: #a0522d;
}

/* 3D Viewer special case */
#moleculeViewer3D {
  width: 100%;
  height: 350px;
  background: #f0f0f0;
  /* Light grey bg for 3D model */
  border: 1px solid var(--border-light);
}

.molecule-info {
  margin-top: 1rem;
  text-align: center;
  padding: 1rem;
  border: 1px solid var(--border-light);
  background: var(--bg-card);
}

.mol-props {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 1rem 0;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  flex-wrap: wrap;
}

.prop-label {
  display: block;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.element-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin: 2rem 0;
}

.element-card {
  border: 1px solid var(--border-light);
  padding: 1rem;
  text-align: center;
  cursor: pointer;
  transition: transform 0.2s;
  background: var(--bg-card);
}

.element-card:hover {
  border-color: var(--color-accent);
}

.element-symbol {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: bold;
  color: var(--color-accent);
}

.element-number {
  font-size: 0.8rem;
  color: var(--text-muted);
  position: absolute;
  top: 0.5rem;
  left: 0.5rem;
}

.element-card {
  position: relative;
}

/* For absolute positioning */

/* ==========================================================================
   Footer & Citations
   ========================================================================== */
section#references {
  margin-top: 4rem;
  border-top: 2px solid var(--text-main);
  padding-top: 2rem;
  font-size: 0.9rem;
}

section#references li {
  margin-bottom: 0.5rem;
  padding-left: 0.5rem;
}

/* ==========================================================================
   Simulation & Terminal Styles
   ========================================================================== */
.simulation-container,
.terminal-container,
.predictor-interface {
  position: relative;
  border: 1px solid var(--border-light);
  border-radius: 8px;
  background: var(--bg-card);
  transition: all 0.3s ease;
  overflow: hidden;
}

/* Highlight interactive sections */
.simulation-container:hover,
.terminal-container:hover,
.predictor-interface:hover {
  border-color: var(--color-link);
  box-shadow: 0 8px 24px rgba(41, 121, 255, 0.12);
  transform: translateY(-2px);
}

.simulation-container::before,
.terminal-container::before,
.predictor-interface::before {
  content: "INTERACTIVE SIMULATION";
  position: absolute;
  top: 0;
  right: 0;
  background: var(--color-accent);
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  padding: 3px 10px;
  border-bottom-left-radius: 8px;
  z-index: 10;
  pointer-events: none;
  opacity: 0.9;
}

/* Terminal Specifics */
.terminal-container {
  background: #0f1218;
  color: #e8eaed;
  font-family: 'JetBrains Mono', monospace;
  padding: 0;
  min-height: 350px;
}

.terminal-header {
  background: #1a1d24;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid #333;
}

.terminal-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.terminal-dot.red {
  background: #ff5252;
}

.terminal-dot.yellow {
  background: #ffab00;
}

.terminal-dot.green {
  background: #00e676;
}

.terminal-title {
  margin-left: 1rem;
  font-size: 0.8rem;
  color: #9aa0a6;
}

.terminal {
  padding: 1rem;
  height: 300px;
  overflow-y: auto;
  font-size: 0.85rem;
  line-height: 1.4;
}

.terminal-line {
  margin-bottom: 0.3rem;
  display: flex;
  align-items: flex-start;
  font-family: 'JetBrains Mono', monospace;
}

.terminal-line.system {
  color: #9aa0a6;
}

.terminal-line.info {
  color: #00d4ff;
}

.terminal-line.data {
  color: #bdc1c6;
}

.terminal-line.warning {
  color: #ffab00;
}

.terminal-line.error {
  color: #ff5252;
}

.terminal-line.success {
  color: #00e676;
  font-weight: bold;
}

.terminal-line.result {
  color: #e040fb;
  font-weight: bold;
  border-left: 2px solid #e040fb;
  padding-left: 0.5rem;
}

.terminal-cursor {
  display: inline-block;
  color: #00e676;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* Quantum vs Classical Highlights */
.highlight-quantum {
  color: #2979ff;
  font-weight: bold;
}

.highlight-classical {
  color: #ff5252;
  font-weight: bold;
}

/* FIX: Ensure 3D Viewer stays in container */
#moleculeViewer3D {
  position: relative !important;
  z-index: 1;
}

/* Terminal Specifics (Rebranded to Math Log) */
.terminal-container {
  background: #fdfdfd;
  /* Paper white */
  color: var(--text-main);
  font-family: var(--font-serif);
  padding: 0;
  min-height: 400px;
  border: 1px solid var(--border-light);
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.02);
}

.terminal-header {
  background: #f0f7fb;
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}

.terminal-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  opacity: 0.6;
}

.terminal-dot.red {
  background: #ff5252;
}

.terminal-dot.yellow {
  background: #ffab00;
}

.terminal-dot.green {
  background: #00e676;
}

.terminal-title {
  margin-left: 1rem;
  font-size: 0.85rem;
  font-family: var(--font-sans);
  color: var(--text-muted);
  font-weight: 500;
  letter-spacing: 0.5px;
}

.terminal {
  padding: 2rem;
  height: 350px;
  /* Taller for math */
  overflow-y: auto;
  font-size: 1.1rem;
  /* Larger for legible math */
  line-height: 1.6;
}

/* Math Log Lines */
.terminal-line {
  margin-bottom: 1rem;
  display: block;
  /* Centered math */
  text-align: center;
  opacity: 0;
  animation: fadeIn 0.4s ease forwards;
}

.terminal-line.header {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
  display: inline-block;
  padding-bottom: 2px;
}

/* Specific math colors */
.terminal-line.math {
  color: var(--text-main);
}

.terminal-line.result {
  color: var(--color-link);
  font-size: 1.2rem;
  margin: 1.5rem 0;
}

.terminal-line.final {
  color: #00a86b;
  font-size: 1.4rem;
  font-weight: bold;
  padding: 10px;
  background: rgba(0, 168, 107, 0.05);
  border-radius: 8px;
}

/* Remove old cursor */
.terminal-cursor {
  display: none;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(5px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}