/* Unified CSS Styles for Material MAP */

/* Light Theme (Default) */
:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-tertiary: #eef1f5;
  --bg-elevated: #ffffff;
  --text-primary: #24292f;
  --text-secondary: #57606a;
  --text-tertiary: #6e7781;
  --accent-primary: #0969da;
  --accent-hover: #0550ae;
  --border-primary: #d0d7de;
  --border-secondary: #d8dee4;
  --table-header-bg: #f6f8fa;
  --table-row-bg: #ffffff;
  --table-row-alt-bg: #f6f8fa;
  --table-row-hover: #eef1f5;
  --input-bg: #ffffff;
  --input-border: #d0d7de;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
  
  /* Warning/Disclaimer */
  --warning-bg: #fff3cd;
  --warning-text: #856404;
  --warning-border: #ffeaa7;
  
  /* Legacy compatibility */
  --bg-color: #ffffff;
  --text-color: #24292f;
  --text-muted: #6e7781;
  --border-color: #d0d7de;
  --card-bg: #ffffff;
  --nav-bg: #24292f;
  --nav-text: #ffffff;
  --link-color: #0969da;
  --link-hover: #0550ae;
  --accent-color: #0969da;
  --code-bg: #f6f8fa;
  --code-text: #24292f;
  --code-header-bg: #f8f9fa;
  --shadow-color: rgba(0, 0, 0, 0.12);
}

/* Dark Theme (Matrix Green) */
.dark-theme {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1f242c;
  --bg-elevated: #13171d;
  --text-primary: #adbac7;
  --text-secondary: #768390;
  --text-tertiary: #545d68;
  --accent-primary: #539bf5;
  --accent-hover: #4489da;
  --border-primary: #444c56;
  --border-secondary: #373e47;
  --table-header-bg: #1c2128;
  --table-row-bg: #22272e;
  --table-row-alt-bg: #1c2128;
  --table-row-hover: #2d333b;
  --input-bg: #1c2128;
  --input-border: #444c56;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.45);
  
  /* Warning/Disclaimer */
  --warning-bg: #2d2a1e;
  --warning-text: #e2b340;
  --warning-border: #4d452d;

  /* Legacy compatibility */
  --bg-color: #0d1117;
  --text-color: #adbac7;
  --text-muted: #768390;
  --border-color: #444c56;
  --card-bg: #22272e;
  --nav-bg: #1c2128;
  --nav-text: #adbac7;
  --link-color: #539bf5;
  --link-hover: #4489da;
  --accent-color: #539bf5;
  --code-bg: #1c2128;
  --code-text: #adbac7;
  --code-header-bg: #1c2128;
  --shadow-color: rgba(0, 0, 0, 0.45);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 6px;
  transition: color 0.2s ease, background-color 0.2s ease;
  flex-shrink: 0;
  margin: 0;
}

.theme-toggle-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-secondary);
}

.theme-toggle-btn svg {
  width: 20px;
  height: 20px;
}

/* BETA Watermark Styles */
.beta-watermark {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) rotate(-45deg);
  font-size: 180px;
  font-weight: 900;
  color: rgba(255, 152, 0, 0.08);
  pointer-events: none;
  z-index: 9999;
  user-select: none;
  letter-spacing: 20px;
  text-transform: uppercase;
  font-family: 'Inter', sans-serif;
}

/* EOS_JWL Visualization Styles */
.jwl-visualization-container {
  margin: 20px 0;
  padding: 15px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

.jwl-visualization-header {
  margin-bottom: 15px;
}

.jwl-visualization-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 15px 0;
}

/* JWL Equation Styles */
.loading-row {
  cursor: wait !important;
  opacity: 0.7;
}

.jwl-equation {
  font-size: 18px;
  font-weight: normal;
  font-family: 'Fira Code', 'Courier New', monospace;
  text-align: center;
  padding: 15px;
  margin: 15px 0;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
  line-height: 1.4;
  color: var(--text-primary);
}

.equation-label {
  color: var(--text-primary);
}

.equation-plus {
  color: var(--text-primary);
  margin: 0 8px;
}

.jwl-term-1 {
  color: #58a6ff;
}

.jwl-term-2 {
  color: #ff7b72;
}

.jwl-term-3 {
  color: #79c0ff;
}

/* Responsive design for equation and mobile layout */
@media (max-width: 768px) {
  .jwl-equation, .johnson-cook-equation, .power-law-equation {
    font-size: 16px;
  }
  
  /* Stack columns vertically on mobile */
  .material-content-layout {
    flex-direction: column !important;
    gap: 20px !important;
  }
  
  .material-data-column,
  .material-visualization-column {
    max-width: 100% !important;
    min-width: auto !important;
    flex: none !important;
  }
  
  .jwl-chart, .johnson-cook-chart, .power-law-chart, .analytical-chart {
    height: 350px;
    width: 100% !important;
    max-width: 100% !important;
    min-width: auto !important;
    box-sizing: border-box !important;
  }
  
  .analytical-equation {
    font-size: 14px;
  }
  
  /* Ensure all chart containers are responsive */
  .curves-chart,
  div[id*="chart"],
  div[class*="chart"] {
    width: 100% !important;
    max-width: 100% !important;
    min-width: auto !important;
    box-sizing: border-box !important;
    overflow: hidden !important;
  }
  
  /* Handle Plotly graphs specifically */
  .plotly-graph-div {
    width: 100% !important;
    max-width: 100% !important;
    min-width: auto !important;
    box-sizing: border-box !important;
  }
  
  /* Equations should wrap properly on mobile */
  .jwl-equation,
  .johnson-cook-equation,
  div[class*="equation"] {
    font-size: 14px !important;
    overflow-x: auto !important;
    word-wrap: break-word !important;
    white-space: normal !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
  }
  
  .johnson-cook-parameters {
    flex-direction: column;
    gap: 10px;
  }
}

/* Material content layout for two-column design */
.material-content-layout {
  display: flex;
  gap: 30px;
  margin-top: 15px;
}

.material-data-column {
  flex: 1;
  min-width: 0; /* Allows flex item to shrink below content width */
  max-width: 50%; /* Ensure it doesn't exceed half the container width */
  overflow: hidden; /* Prevent content overflow */
  box-sizing: border-box;
}

.material-visualization-column {
  flex: 1;
  min-width: 0; /* Allows flex item to shrink below content width */
  max-width: 50%; /* Ensure it doesn't exceed half the container width */
  overflow: hidden; /* Prevent content overflow */
  box-sizing: border-box;
}

.jwl-chart {
  width: 100%;
  height: 400px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

/* Generic JSON-driven Analytical Visualization Styles */
.analytical-visualization-container {
  margin: 20px 0;
  padding: 15px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

.analytical-equation {
  font-size: 18px;
  font-weight: normal;
  font-family: 'Fira Code', 'Courier New', monospace;
  text-align: center;
  padding: 15px;
  margin: 15px 0;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
  line-height: 1.4;
  color: var(--text-primary);
}

.analytical-chart {
  width: 100%;
  height: 400px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

/* Johnson-Cook Visualization Styles */
.johnson-cook-visualization-container {
  margin: 20px 0;
  padding: 15px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

.johnson-cook-visualization-header {
  margin-bottom: 15px;
}

.johnson-cook-visualization-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 15px 0;
}

/* Swift Law Visualization Styles */
.swift-law-visualization-container {
  margin: 20px 0;
  padding: 15px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

.swift-law-visualization-header {
  margin-bottom: 15px;
}

.swift-law-visualization-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 15px 0;
}

/* Swift Law Equation Styles */
.swift-law-equation {
  font-size: 18px;
  font-weight: normal;
  font-family: 'Fira Code', 'Courier New', monospace;
  text-align: center;
  padding: 15px;
  margin: 15px 0;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
  line-height: 1.4;
  color: var(--text-primary);
}

/* Swift Law Container Content Styles */
.swift-law-visualization-container pre {
  margin: 0;
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  white-space: pre;
  overflow-x: auto;
  padding: 1rem;
  background-color: var(--bg-tertiary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

/* Ensure code content in Swift Law containers uses monospace */
.swift-law-visualization-container pre,
.swift-law-visualization-container code {
  font-family: 'Fira Code', 'Courier New', monospace;
  font-size: 14px;
  line-height: 1.5;
}

/* Power Law Plasticity Visualization Styles */
.power-law-visualization-container {
  margin: 20px 0;
  padding: 15px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

.power-law-visualization-header {
  margin-bottom: 15px;
}

.power-law-visualization-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 15px 0;
}

/* Power Law Equation Styles */
.power-law-equation {
  font-size: 18px;
  font-weight: normal;
  font-family: 'Fira Code', 'Courier New', monospace;
  text-align: center;
  padding: 15px;
  margin: 15px 0;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
  line-height: 1.4;
  color: var(--text-primary);
}

/* Johnson-Cook Equation Styles */
.johnson-cook-equation {
  font-size: 18px;
  font-weight: normal;
  font-family: 'Fira Code', 'Courier New', monospace;
  text-align: center;
  padding: 15px;
  margin: 15px 0;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
  line-height: 1.4;
  color: var(--text-primary);
}

.equation-multiply {
  color: var(--text-primary);
  margin: 0 8px;
}

.jc-term-1 {
  color: #0066ff;
}

.jc-term-2 {
  color: #ff0000;
}

.jc-term-3 {
  color: #00cc00;
}

/* Johnson-Cook Parameters Display */
.johnson-cook-parameters {
  font-size: 14px;
  text-align: center;
  padding: 10px;
  margin: 10px 0;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 15px;
}

.param-label {
  color: var(--text-primary);
  font-weight: 600;
}

.param-value {
  color: #495057;
  font-family: 'Fira Code', 'Courier New', monospace;
  font-weight: 500;
}

.johnson-cook-chart {
  width: 100%;
  height: 400px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

/* EOS_GRUNEISEN Visualization Styles */
.gruneisen-visualization-container {
  margin: 20px 0;
  padding: 15px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

.gruneisen-visualization-header {
  margin-bottom: 15px;
}

.gruneisen-visualization-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 15px 0;
}

/* Gruneisen Equation Styles */
.gruneisen-equation {
  font-size: 18px;
  font-weight: normal;
  font-family: 'Fira Code', 'Courier New', monospace;
  text-align: center;
  padding: 15px;
  margin: 15px 0;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
  line-height: 1.4;
  color: var(--text-primary);
}

.gruneisen-term {
  color: var(--text-primary);
}

.gruneisen-thermal {
  color: var(--text-primary);
}

.gruneisen-chart {
  width: 100%;
  height: 400px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

/* Navigation Menu - GitHub Style */
.nav-menu {
    background-color: var(--bg-elevated);
    border-bottom: 1px solid var(--border-primary);
    padding: 0;
    margin: 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    padding: 0.75rem 2rem;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-brand {
    color: var(--accent-primary);
    font-size: 1.5rem;
    font-weight: 600;
    text-decoration: none;
    padding: 0;
}

.nav-brand:hover {
    color: var(--accent-hover);
    text-decoration: none;
}

.nav-links {
    display: flex;
    list-style: none;
    margin: 0 2rem 0 auto;
    padding: 0;
    gap: 2rem;
}

.nav-links li {
    margin: 0;
}

.nav-links a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0;
    transition: color 0.2s ease;
    font-weight: 400;
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: var(--accent-primary);
    text-decoration: none;
}

.nav-links a.active {
    color: var(--text-primary);
    font-weight: 500;
}

/* Dropdown menu styles */
.nav-links li {
    position: relative;
}

.nav-dropdown {
    position: relative;
    padding-bottom: 0;
}

.nav-dropdown::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 10px;
    z-index: 999;
}

.nav-dropdown > a {
    display: flex;
    align-items: center;
    gap: 5px;
}

.nav-dropdown > a::after {
    content: '▼';
    font-size: 0.7em;
    transition: transform 0.3s ease;
}

.nav-dropdown:hover > a::after {
    transform: rotate(-180deg);
}

.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 0px);
    left: 0;
    background-color: var(--bg-elevated);
    min-width: 220px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    list-style: none;
    margin: 0;
    padding: 0.5rem 0;
    z-index: 1000;
}

.nav-dropdown:hover .nav-dropdown-menu {
    display: block;
}

.nav-dropdown-menu li {
    margin: 0;
}

.nav-dropdown-menu a {
    display: block;
    padding: 0.625rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: background-color 0.2s ease;
    font-weight: 400;
    font-size: 0.875rem;
}

.nav-dropdown-menu a:hover {
    background-color: var(--bg-secondary);
    color: var(--accent-primary);
}

.nav-dropdown-menu li:last-child a {
    border-bottom: none;
}

/* Mobile menu toggle */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 10px;
}

/* Mobile responsive */
@media (max-width: 768px) {
    .nav-container {
        flex-wrap: wrap;
        padding: 0 15px;
    }

    .theme-toggle-btn {
        order: -1;
    }

    .nav-toggle {
        display: block;
    }
    
    .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        background-color: var(--bg-elevated);
        position: absolute;
        top: 100%;
        left: 0;
        box-shadow: var(--shadow);
        /* Fix for mobile scrolling */
        max-height: calc(100vh - 60px);
        overflow-y: auto;
        overflow-x: hidden;
        -webkit-overflow-scrolling: touch;
        overscroll-behavior: contain;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links a {
        padding: 15px 20px;
        border-top: 1px solid var(--border-primary);
    }
    
    /* Mobile dropdown styles */
    .nav-dropdown-menu {
        position: static;
        display: none;
        background-color: var(--bg-secondary);
        box-shadow: none;
        width: 100%;
        border: none;
        border-radius: 0;
        margin: 0;
    }
    
    .nav-dropdown.active .nav-dropdown-menu {
        display: block;
    }
    
    .nav-dropdown > a::after {
        margin-left: auto;
    }
    
    .nav-dropdown-menu a {
        padding-left: 40px;
        border-top: 1px solid var(--border-primary);
    }
    
    /* Drill-down navigation on mobile */
    .nav-links.drill-down-active > li:not(.nav-dropdown.active) {
        display: none;
    }
    
    .nav-links.drill-down-active .nav-dropdown.active > a {
        display: none;
    }
    
    .nav-back-btn {
        display: block;
        width: 100%;
        padding: 15px 20px;
        background-color: var(--bg-tertiary);
        color: var(--text-primary);
        border: none;
        border-top: 1px solid var(--border-primary);
        text-align: left;
        font-size: 1rem;
        font-weight: 600;
        cursor: pointer;
        transition: background-color 0.3s ease;
    }
    
    .nav-back-btn:hover {
        background-color: var(--bg-secondary);
        color: var(--accent-primary);
    }
    
    .nav-links.drill-down-active .nav-dropdown-menu a {
        padding-left: 20px;
    }
}

/* Prevent body scroll when mobile menu is open */
body.nav-menu-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
}

/* Global styles */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.6;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

/* General link styles */
a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color 0.2s ease;
}

a:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* Container styles - unified for .container and .main-container */
.container,
.main-container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
    background: transparent;
    border-radius: 0;
    box-shadow: none;
    min-height: auto;
}

/* Headings */
h1 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    text-align: left;
    font-weight: 600;
}

h2 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem 0;
    color: var(--text-primary);
    font-weight: 600;
}

/* Page Title Section */
.page-title {
    margin-bottom: 2rem;
}

.page-title h1 {
    margin-bottom: 0.5rem;
}

.page-title p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin: 0;
}

/* Filters Section */
.filters,
#loading {
    background-color: var(--bg-elevated);
    color: var(--text-primary);
    padding: 10px;
    border-radius: 4px;
    border: 1px solid var(--border-primary);
}

.clear-button {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.clear-button:hover {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.dark-theme .js-plotly-plot .main-svg {
    background: transparent !important;
}

.dark-theme .js-plotly-plot .bg {
    fill: transparent !important;
}

.filters-container {
    background: var(--bg-elevated);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-group label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Form elements */
.input-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}



.input-item {
    display: flex;
    flex-direction: column;
}

label {
    font-weight: 500;
    margin-bottom: 5px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

input, select, input[type="text"], input[type="number"] {
    padding: 0.625rem 0.75rem;
    background: var(--input-bg);
    border: 1px solid var(--input-border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.95rem;
    transition: border-color 0.2s ease;
}

input:focus, select:focus, input[type="text"]:focus, input[type="number"]:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: none;
}

.unit-selector {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

/* Results display */
.results {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.result-item {
    background: var(--bg-tertiary);
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid var(--accent-primary);
}

.result-name {
    font-weight: bold;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.result-value {
    font-size: 18px;
    color: var(--accent-primary);
    font-family: 'Fira Code', 'Courier New', monospace;
}

.result-value a {
    color: var(--accent-primary);
    text-decoration: underline;
    word-break: break-all;
}

/* Component Classes */
.disclaimer-box {
    margin-bottom: 30px;
    padding: 20px;
    background-color: var(--warning-bg);
    border-radius: 8px;
    border: 1px solid var(--warning-border);
    border-left: 4px solid var(--warning-border);
}

.disclaimer-box h3 {
    margin: 0 0 10px 0;
    color: var(--warning-text);
    font-size: 18px;
}

.disclaimer-box p {
    margin: 0 0 10px 0;
    color: var(--warning-text);
    line-height: 1.6;
    font-size: 14px;
}

.disclaimer-box a {
    color: var(--warning-text);
    text-decoration: underline;
}

.disclaimer-box strong {
    color: var(--warning-text);
}

.formula-info {
    text-align: center;
    margin-bottom: 30px;
    padding: 20px;
    background-color: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-primary);
    border-left: 4px solid var(--accent-primary);
}

.formula-info h2 {
    margin: 0;
    color: var(--text-primary);
    font-size: 24px;
}

.formula-info .formula-text {
    font-size: 18px;
    font-weight: bold;
    margin: 15px 0;
    color: var(--text-primary);
    font-family: 'Times New Roman', serif;
}

.formula-info .formula-description {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.result-value a:hover {
    color: #2980b9;
    text-decoration: underline;
}

/* Result groups */
.result-group {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 25px;
    border: 1px solid var(--border-secondary);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.result-group-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 15px 0;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent-primary);
    display: flex;
    align-items: center;
}

.result-group-title::before {
    content: "■";
    margin-right: 8px;
    font-size: 18px;
    color: var(--accent-primary);
}

/* Specific icons for each group */
.result-group:nth-child(1) .result-group-title::before {
    content: "E"; /* Elastic Characteristics */
    font-weight: bold;
    background: var(--accent-primary);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.result-group:nth-child(2) .result-group-title::before {
    content: "S"; /* Strength */
    font-weight: bold;
    background: #e74c3c;
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.result-group:nth-child(3) .result-group-title::before {
    content: "G"; /* Fracture Energy */
    font-weight: bold;
    background: #f39c12;
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.result-group:nth-child(4) .result-group-title::before {
    content: "W"; /* Crack Opening */
    font-weight: bold;
    background: #9b59b6;
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
}

.result-group .result-item {
    margin-bottom: 10px;
    background: var(--bg-primary);
    border-left: 3px solid #3498db;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

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

/* Override grid layout for grouped results */
.results.grouped {
    display: block;
}

/* Table styles - GitHub Style */
.table-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    overflow: hidden;
    margin-top: 20px;
}

.table-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.table-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.badge {
    background: var(--accent-primary);
    color: #ffffff;
    padding: 0.375rem 0.75rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 0;
    font-size: 1rem;
    text-align: left;
    background: var(--table-row-bg);
    table-layout: auto;
}

thead {
    background: var(--table-header-bg);
}

th, td {
    padding: 0.875rem 1.5rem;
    border-bottom: 1px solid var(--border-secondary);
    text-align: left;
}

th {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    vertical-align: top;
}

/* Remove DataTables sorting indicators */
table.dataTable thead th,
table.dataTable thead td {
    cursor: default !important;
}

table.dataTable thead th:before,
table.dataTable thead th:after,
table.dataTable thead td:before,
table.dataTable thead td:after {
    display: none !important;
}

/* Fix table alignment issues */
table.dataTable {
    width: 100% !important;
    table-layout: fixed;
}

table.dataTable thead th,
table.dataTable tbody td {
    box-sizing: border-box;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

/* Ensure proper column widths */
#materials-table th:nth-child(1),
#materials-table td:nth-child(1) {
    width: 35% !important;
}

#materials-table th:nth-child(2),
#materials-table td:nth-child(2) {
    width: 25% !important;
}

#materials-table th:nth-child(3),
#materials-table td:nth-child(3) {
    width: 40% !important;
}

td {
    vertical-align: top;
    color: var(--text-primary);
}

tbody tr {
    background: var(--table-row-bg);
    border-bottom: 1px solid var(--border-secondary);
    transition: background 0.2s ease;
}

tbody tr:nth-child(even) {
    background: var(--table-row-alt-bg);
}

tbody tr:hover {
    background: var(--table-row-hover);
}

td.model-name {
    color: var(--accent-primary);
    font-weight: 500;
}

td.secondary {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Specific styles for Applications column in materials table */
#materials-table td ul {
    margin: 0;
    padding-left: 1.2em;
    vertical-align: top;
    text-align: left;
}

#materials-table td li {
    margin: 0;
    padding: 0;
    vertical-align: top;
}

#materials-table tbody tr:not(.child) {
    cursor: pointer;
}

.table-container {
    overflow-x: auto;
    margin-top: 20px;
}

.table-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

/* Header count styles */
.header-count {
    font-weight: normal;
    color: #ffffff;
    font-size: 0.9em;
    opacity: 0.8;
}

/* Chart styles */
.chart-container {
    margin-top: 20px;
    text-align: center;
    overflow: hidden;
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    position: relative;
    padding: 15px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 4px;
}

/* Plotly modebar positioning fix */
.chart-container .modebar {
    position: absolute !important;
    top: 5px !important;
    right: 5px !important;
    width: auto !important;
    max-width: calc(100% - 10px) !important;
    overflow: hidden !important;
    z-index: 1000 !important;
    box-sizing: border-box !important;
}

/* Ensure Plotly chart respects container boundaries */
.chart-container .plotly-graph-div {
    width: 100% !important;
    max-width: 100% !important;
    overflow: hidden !important;
    box-sizing: border-box !important;
}

#stressStrainChart,
#johnsonCookChart,
#mooneyRivlinChart,
#plotlyReference,
#chartSvg {
    border: 1px solid var(--border-primary);
    border-radius: 4px;
    background: var(--bg-primary);
    width: 100% !important;
    max-width: 100%;
    box-sizing: border-box;
}

/* Button styles - Unified copy-button style */
.btn,
button:not(.theme-toggle-btn):not(.nav-toggle) {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.btn:hover,
button:not(.theme-toggle-btn):not(.nav-toggle):hover {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.export-btn {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-top: 15px;
    margin-bottom: 10px;
}

.export-btn:hover {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* Code block styles - unified from index.html */
.code-container {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    margin: 20px auto;
    overflow: hidden;
    box-sizing: border-box;
    text-align: left;
    width: 750px !important; /* ~90 characters at 8px each + padding */
    max-width: 100%;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--code-header-bg);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    font-weight: bold;
    font-size: 1rem;
}

.code-header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.unit-system-selector {
    padding: 4px 8px;
    border-radius: 4px;
    border: 1px solid var(--border-primary);
    font-size: 0.85rem;
    background-color: var(--input-bg);
    color: var(--text-primary);
    cursor: pointer;
    max-width: 250px;
}

.unit-system-selector:hover {
    border-color: var(--accent-primary);
}

.unit-system-selector:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(83, 155, 245, 0.2);
}

.code-title {
    font-family: 'Fira Code', 'Courier New', monospace;
}

.copy-button {
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.copy-button:hover {
    background: var(--bg-tertiary);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.code-container pre {
    margin: 0;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    white-space: pre;
    overflow-x: auto;
    padding: 1rem;
    background-color: var(--bg-primary);
}

/* Collapsible sections */
.collapsible-header {
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: color 0.3s ease;
    margin: 0 0 15px 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.collapsible-header:hover {
    color: var(--accent-primary);
}

.collapsible-header::before {
    content: '▼';
    font-size: 14px;
    transition: transform 0.3s ease;
    color: #666;
}

.collapsible-header.collapsed::before {
    transform: rotate(-90deg);
}

.collapsible-content {
    transition: all 0.3s ease;
    overflow: hidden;
}

.collapsible-content.collapsed {
    max-height: 0;
    opacity: 0;
    margin: 0;
    padding: 0;
}

/* Filters container styles */
.filters-container {
    width: 100%;
    margin: 20px auto;
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    align-items: flex-end;
    padding: 20px;
    background-color: var(--bg-elevated);
    border-radius: 8px;
    border: 1px solid var(--border-primary);
    box-sizing: border-box;
}

.filter-group {
    display: flex;
    flex-direction: column;
    min-width: 150px;
    flex: 1; /* Allow groups to grow and shrink */
    max-width: 100%; /* Prevent overflow */
    box-sizing: border-box;
}

.filter-group.filter-physical,
.filter-group.filter-eos {
    flex: 1;
}

.filter-group.filter-material {
    flex: 1.5;
}

.filter-count {
    font-weight: normal;
    color: #6c757d;
    font-size: 0.8rem;
}

.filter-select {
    padding: 8px 12px;
    border: 1px solid var(--border-primary);
    border-radius: 4px;
    background-color: var(--input-bg);
    color: var(--text-primary);
    font-size: 0.9rem;
    min-height: 120px;
    max-height: 200px;
    overflow-y: auto;
    width: 100%;
    box-sizing: border-box;
}

.filter-select:focus {
    outline: none;
    border-color: #4169E1;
    box-shadow: 0 0 0 2px rgba(65, 105, 225, 0.2);
}

.filter-select option {
    padding: 4px 8px;
}

.filter-select option:checked {
    background-color: #4169E1;
    color: white;
}

.filter-actions {
    display: flex;
    align-items: flex-end;
    height: 100%;
}

.btn.clear-button,
button.clear-button {
    padding: 0.4rem 0.8rem;
    background: var(--bg-elevated);
    color: var(--text-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    min-width: 80px;
    height: 120px; /* Match filter-select min-height */
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.btn.clear-button span,
button.clear-button span {
    display: block;
}

.btn.clear-button:hover,
button.clear-button:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.btn.clear-button:active,
button.clear-button:active {
    background: var(--bg-secondary);
}

/* Reference block styles */
.reference-block {
    word-wrap: break-word;
    overflow-wrap: break-word;
    text-overflow: ellipsis;
    max-width: 1200px;
    text-align: left;
    overflow: hidden;
    margin: 0.5em 0;
    padding: 0.5em;
    background-color: var(--bg-secondary);
    border-radius: 4px;
    border-left: 4px solid var(--accent-primary);
}

.reference-block a {
    color: var(--link-color);
    text-decoration: none;
}

.reference-block a:hover {
    text-decoration: underline;
}

/* URL, Units and comments block styles */
.url-block, .units-block, .comments-block {
    word-wrap: break-word;
    overflow-wrap: break-word;
    text-overflow: ellipsis;
    max-width: 1200px;
    text-align: left;
    overflow: hidden;
    margin: 0.5em 0;
    padding: 0.5em;
    background-color: var(--bg-secondary);
    border-radius: 4px;
    border-left: 4px solid var(--accent-primary);
}

.units-info {
    font-family: 'Fira Code', monospace;
    color: var(--accent-primary);
    font-weight: 600;
}

.comments-info {
    color: var(--text-secondary);
    font-style: italic;
}

/* About page styles */
.about-section {
    margin: 0 auto;
    max-width: 800px;
    padding: 1em;
}

.about-section h1 {
    font-size: 2em;
    font-weight: bold;
    margin-bottom: 1em;
}

.about-section p {
    text-align: justify;
    line-height: 1.6;
}

.back-link {
    margin-top: 20px;
    text-align: center;
}

.back-link a {
    display: inline-block;
    margin-top: 2em;
    padding: 0.5em 1em;
    background-color: #4169E1;
    color: white;
    border-radius: 5px;
    text-decoration: none;
    font-size: 1em;
    transition: background-color 0.2s ease;
}

.back-link a:hover {
    background-color: #27408B;
}

.about-link {
    margin-top: 30px;
    text-align: center;
}

.about-link p {
    margin: 10px 0;
}

/* Utility classes */
.hidden {
    display: none !important;
}

/* Responsive styles */
@media (max-width: 768px) {
    .input-group {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    

    
    .results {
        grid-template-columns: 1fr;
    }
    
    .filters-container {
        flex-direction: column;
        align-items: stretch;
        padding: 15px;
        gap: 15px;
        margin: 20px 10px; /* Add horizontal margin to prevent overflow */
        width: calc(100% - 20px); /* Ensure container fits within viewport */
        box-sizing: border-box;
    }
    
    .filter-group {
        min-width: auto;
        width: 100%; /* Take full width of container */
        max-width: 100%; /* Prevent overflow */
        box-sizing: border-box;
    }
    
    .filter-select {
        width: 100%; /* Take full width of filter group */
        max-width: 100%; /* Prevent overflow */
        box-sizing: border-box;
    }
    
    .clear-button {
        min-height: 44px; /* Improve touch target size */
        padding: 12px 20px;
        height: auto;
        width: 100%;
        flex-direction: row;
        gap: 5px;
    }

    .clear-button span {
        display: inline;
    }
    
    /* Mobile-specific container adjustments */
    .container,
    .main-container {
        margin: 10px;
        padding: 15px;
        border-radius: 8px;
    }
    
    /* DataTables mobile improvements */
    .dataTables_wrapper {
        font-size: 14px;
    }
    
    .dataTables_wrapper .dataTables_length,
    .dataTables_wrapper .dataTables_filter {
        margin-bottom: 10px;
    }
    
    .dataTables_wrapper .dataTables_info,
    .dataTables_wrapper .dataTables_paginate {
        margin-top: 10px;
    }
    
    /* Responsive table wrapper */
    .dataTables_wrapper .dataTables_scroll {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    /* Mobile table styling */
    table.dataTable {
        font-size: 14px;
    }
    
    table.dataTable th,
    table.dataTable td {
        padding: 8px 4px;
        word-wrap: break-word;
        max-width: 200px;
    }
    
    /* Responsive details styling */
    table.dataTable.dtr-inline.collapsed > tbody > tr > td.dtr-control:before,
    table.dataTable.dtr-inline.collapsed > tbody > tr > th.dtr-control:before {
        background-color: var(--accent-primary);
        border: 2px solid white;
        border-radius: 14px;
        box-shadow: 0 0 3px #444;
        box-sizing: content-box;
        color: white;
        content: '+';
        display: block;
        font-family: 'Courier New', Courier, monospace;
        font-size: 14px;
        font-weight: bold;
        height: 14px;
        line-height: 14px;
        margin-left: -10px;
        margin-top: -10px;
        text-align: center;
        text-indent: 0 !important;
        width: 14px;
    }
    
    table.dataTable.dtr-inline.collapsed > tbody > tr.parent > td.dtr-control:before,
    table.dataTable.dtr-inline.collapsed > tbody > tr.parent > th.dtr-control:before {
        content: '-';
        background-color: #d33333;
    }
}

@media (max-width: 600px) {
    body {
        font-size: 0.9rem;
    }

    h1 {
        font-size: 1.5rem;
        margin-bottom: 20px;
    }
    
    /* Responsive chart styles */
    .chart-container {
        margin-top: 10px;
        overflow-x: hidden;
    }
    
    /* More compact modebar on mobile */
    .chart-container .modebar {
        right: 2px !important;
        top: 2px !important;
        max-width: calc(100% - 4px) !important;
    }
    
    /* Hide some modebar buttons on very small screens */
    .chart-container .modebar .modebar-group:last-child {
        display: none !important;
    }
    
    /* Make header boxes more compact on mobile */
    .material-visualization-column > div:first-child,
    .material-data-column > div:first-child {
        margin: 10px 0 !important;
        padding: 10px !important;
        font-size: 18px !important;
        word-wrap: break-word;
        overflow-wrap: break-word;
    }
    
    #stressStrainChart,
    #johnsonCookChart,
    #mooneyRivlinChart,
    #chartSvg {
        max-width: 100%;
        height: auto;
    }

    th, td {
        padding: 6px 4px;
        font-size: 0.85rem;
    }

    .code-container {
        margin: 15px 0;
    }
    
    .code-header {
        padding: 0.5rem;
        font-size: 0.9rem;
        flex-wrap: wrap;
        gap: 6px;
    }

    .code-title {
        font-size: 0.75rem;
        word-break: break-all;
        min-width: 0;
        flex: 1 1 100%;
    }

    .card-unit-select,
    .copy-button {
        flex-shrink: 0;
    }
    
    .code-container pre {
        padding: 0.75rem;
        font-size: 12px;
    }
    
    /* Additional mobile improvements for very small screens */
    .container,
    .main-container {
        margin: 5px;
        padding: 10px;
        border-radius: 6px;
    }
    
    .filters-container {
        padding: 10px;
        gap: 10px;
        margin: 15px 5px; /* Reduce margins for very small screens */
        width: calc(100% - 10px); /* Adjust width for smaller margins */
    }
    
    .filter-group {
        width: 100%;
        max-width: 100%;
    }
    
    .filter-select {
        min-height: 100px;
        max-height: 150px;
        font-size: 0.85rem;
        width: 100%;
        max-width: 100%;
    }
    
    .clear-button {
        min-height: 44px; /* Ensure touch target size on small screens */
        padding: 12px 16px;
        height: auto;
        width: 100%;
        flex-direction: row;
        gap: 5px;
    }

    .clear-button span {
        display: inline;
    }
    
    /* DataTables mobile pagination */
    .dataTables_wrapper .dataTables_paginate .paginate_button {
        padding: 0.3em 0.6em;
        margin-left: 1px;
        font-size: 0.85rem;
    }
    
    /* Mobile search and length controls */
    .dataTables_wrapper .dataTables_filter input {
        width: 100%;
        max-width: none;
        margin-left: 0;
        margin-top: 5px;
    }
    
    .dataTables_wrapper .dataTables_length select {
        width: auto;
        min-width: 60px;
    }
    
    /* Responsive table improvements */
    table.dataTable th,
    table.dataTable td {
        max-width: 150px;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    
    /* Applications column specific styling */
    #materials-table td ul {
        padding-left: 1em;
        margin: 0;
    }
    
    #materials-table td li {
        font-size: 0.8rem;
        line-height: 1.3;
    }
}

/* Touch-friendly improvements */
@media (hover: none) and (pointer: coarse) {
    /* Touch device specific styles */
    .nav-links a {
        padding: 18px 20px;
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    
    .nav-toggle {
        padding: 15px;
        min-height: 44px;
        min-width: 44px;
    }
    
    .clear-button {
        padding: 12px 20px;
        min-height: 44px;
        box-sizing: border-box;
    }
    
    .dataTables_wrapper .dataTables_paginate .paginate_button {
        min-height: 44px;
        min-width: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
    
    /* Larger touch targets for table controls */
    table.dataTable.dtr-inline.collapsed > tbody > tr > td.dtr-control:before,
    table.dataTable.dtr-inline.collapsed > tbody > tr > th.dtr-control:before {
        width: 20px;
        height: 20px;
        line-height: 20px;
        font-size: 16px;
        margin-left: -12px;
        margin-top: -12px;
    }
}

/* DEFINE_CURVE Visualization Styles */
.curves-visualization-container {
  margin: 20px 0;
  padding: 15px;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

.curves-visualization-header {
  margin-bottom: 15px;
}

.curves-visualization-header h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 15px 0;
}

.curves-chart {
  width: 100%;
  min-height: 400px;
  background-color: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
}

/* Data table transition rows */
.transition-row {
  background-color: var(--accent-secondary) !important;
  color: var(--text-primary);
}

/* Individual curve chart container */
.curve-chart-container {
  margin: 20px 0;
  border: 1px solid var(--border-primary);
  border-radius: 4px;
  background: var(--bg-primary);
  overflow: hidden;
}

.curve-chart-header {
  background: var(--bg-secondary);
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-primary);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 14px;
}

/* Responsive curve charts */
@media (max-width: 768px) {
  .curves-chart {
    min-height: 300px;
  }
  
  .curve-chart-container {
    margin: 15px 0;
  }
  
  .curve-chart-header {
    padding: 10px 12px;
    font-size: 13px;
  }
}

/* FEM Parameters Section Styles */
.section-container {
  margin: 20px 0;
  background: var(--bg-primary);
  border: 1px solid var(--border-primary);
  border-radius: 4px;
  overflow: hidden;
}

.section-header {
  background: var(--bg-secondary);
  color: var(--text-primary);
  padding: 15px 20px;
  cursor: pointer;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.3s ease;
}

.section-header:hover {
  background: var(--bg-tertiary);
}

.section-header h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.collapse-icon {
  font-size: 12px;
  transition: transform 0.3s ease;
}

.section-header.collapsed .collapse-icon {
  transform: rotate(-90deg);
}

.section-content {
  max-height: 500px;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}

.section-content.expanded {
  padding: 20px;
}

.section-content.collapsed {
  max-height: 0;
  padding: 0 20px;
}

/* Responsive adjustments for FEM section */
@media (max-width: 768px) {
  .section-header {
    padding: 12px 15px;
  }
  
  .section-header h3 {
    font-size: 14px;
  }
  
  .section-content.expanded {
    padding: 15px;
  }
}

/* Chemistry Mechanism Styles */
.app-tag {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  background-color: #e3f2fd;
  color: #1976d2;
  border-radius: 4px;
  font-size: 0.85rem;
  font-weight: 500;
}

.mechanism-info {
  padding: 0.5rem 0;
}

.mechanism-info strong {
  font-size: 1.05rem;
  color: #333;
}

.mechanism-details {
  color: #666;
  font-size: 0.9rem;
}

.mechanism-details p {
  margin: 0.25rem 0;
  line-height: 1.4;
}

.reference-text {
  display: block;
  font-style: italic;
  color: #666;
  margin-top: 0.5rem;
  line-height: 1.4;
}

.reference-text a {
  color: #1976d2;
  text-decoration: none;
  font-style: italic;
}

.reference-text a:hover {
  text-decoration: underline;
  color: #0d47a1;
}

.mechanism-expanded {
  padding: 1.5rem;
  background-color: #fafafa;
}

/* Card & Panel Components - GitHub Style */
.card,
.feature-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    padding: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover,
.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.panel {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    padding: 1.5rem;
}

.panel h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

/* Grid Layouts */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    text-align: center;
    padding: 2rem 0;
}

.stat-value {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.two-column {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

/* Info Box */
.info-box {
    background: var(--bg-tertiary);
    border-left: 4px solid var(--accent-primary);
    border-radius: 6px;
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
}

.info-box p {
    margin: 0.5rem 0;
    color: var(--text-primary);
}

/* Reference Box */
.reference-box {
    margin-top: 2.5rem;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border-radius: 8px;
    border: 1px solid var(--border-primary);
}

.reference-box h3 {
    margin-top: 0;
    color: var(--text-primary);
}

.reference-box p {
    margin: 0.625rem 0;
    line-height: 1.6;
}

.reference-box a {
    color: var(--accent-primary);
    text-decoration: none;
}

.reference-box h4 {
    margin-top: 1.25rem;
    margin-bottom: 0.625rem;
    color: var(--text-secondary);
    font-size: 1.1em;
}

.reference-box a:hover {
    text-decoration: underline;
}

.reference-box .reference-note {
    font-size: 0.9em;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Input Hint */
.input-hint {
    color: var(--text-tertiary);
    font-size: 0.85em;
    margin-top: 4px;
    display: block;
}

/* Footer */
footer {
    margin-top: 4rem;
    padding: 2rem;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-primary);
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .two-column,
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .container,
    .main-container {
        padding: 0 1rem;
    }
    
    .nav-container {
        padding: 1rem;
    }
    
    .filters,
    .filters-container {
        grid-template-columns: 1fr;
    }
}

/* ============================================================
   MOBILE RESPONSIVE ENHANCEMENTS
   Global base resets + breakpoints: 480px, 375px
   Touch target enforcement
   ============================================================ */

/* Global box-sizing (safe: only sets it where not yet set by cascade) */
*,
*::before,
*::after {
    box-sizing: border-box;
}

/* Remove tap highlight on touch devices */
* {
    -webkit-tap-highlight-color: transparent;
}

/* Media elements stay within their containers */
img,
video,
canvas {
    max-width: 100%;
    height: auto;
}

/* Code blocks: scroll horizontally instead of breaking layout */
pre,
code {
    overflow-x: auto;
    word-break: normal;
    word-wrap: normal;
}

/* ---- Extended touch-friendly improvements (pointer: coarse) ---- */
@media (hover: none) and (pointer: coarse) {
    .theme-toggle-btn {
        min-height: 44px;
        min-width: 44px;
        padding: 10px;
    }

    .units-toggle {
        min-height: 44px;
        padding: 10px 16px;
        font-size: 1rem;
    }

    .section-header {
        min-height: 44px;
    }

    /* Prevent iOS from zooming into focused inputs */
    select,
    input[type='text'],
    input[type='number'],
    input[type='email'],
    input[type='search'] {
        font-size: 16px;
        min-height: 44px;
    }

    button:not(.theme-toggle-btn):not(.nav-toggle):not(.clear-button):not(.nav-back-btn) {
        min-height: 44px;
    }

    /* Paginate buttons already covered at 44px above — reinforce box model */
    .dataTables_wrapper .dataTables_paginate .paginate_button {
        box-sizing: border-box;
    }
}

/* ---- Large phones (≤ 480px) ---- */
@media (max-width: 480px) {
    body {
        font-size: 0.875rem;
    }

    .beta-watermark {
        font-size: 56px;
        letter-spacing: 4px;
    }

    .jwl-equation {
        font-size: 13px;
        padding: 10px;
        overflow-x: auto;
        white-space: nowrap;
    }

    .curves-chart {
        min-height: 260px;
    }

    .material-content-layout {
        flex-direction: column !important;
        gap: 12px !important;
    }

    .material-data-column,
    .material-visualization-column {
        max-width: 100% !important;
        min-width: auto !important;
        flex: none !important;
    }

    .code-container pre {
        font-size: 10px;
        padding: 8px;
    }

    .units-panel {
        padding: 12px;
    }

    .units-grid {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    #materialsTable_wrapper,
    .dataTables_scrollBody {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .nav-brand {
        font-size: 1.1rem;
    }

    .section-content.expanded {
        padding: 12px;
    }

    .curve-chart-container {
        margin: 10px 0;
    }

    .jwl-visualization-container,
    .analytical-visualization-container,
    .johnson-cook-visualization-container,
    .swift-law-visualization-container,
    .power-law-visualization-container,
    .gruneisen-visualization-container,
    .curves-visualization-container {
        padding: 10px;
        margin: 12px 0;
    }
}

/* ---- Small phones (≤ 375px) ---- */
@media (max-width: 375px) {
    body {
        font-size: 0.8125rem;
    }

    h1 {
        font-size: 1.25rem;
    }

    h2 {
        font-size: 1.1rem;
    }

    .beta-watermark {
        display: none;
    }

    .nav-brand {
        font-size: 1rem;
    }

    .nav-container {
        padding: 0 10px;
    }

    th,
    td {
        padding: 4px 3px;
        font-size: 0.75rem;
    }

    .units-panel {
        padding: 8px;
    }

    .units-grid {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .filter-select {
        min-height: 80px;
        max-height: 120px;
    }

    .code-container pre {
        font-size: 9px;
        padding: 6px;
    }

    .jwl-equation {
        font-size: 11px;
    }

    footer {
        padding: 1rem;
        font-size: 0.75rem;
    }

    .section-content.expanded {
        padding: 10px;
    }

    .input-with-units {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
    }

    .unit-selector {
        min-width: 100%;
        max-width: 100%;
    }
}