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

:root {
    /* Defense Department Color Scheme */
    --primary-color: #003366;        /* Navy Blue */
    --secondary-color: #C41E3A;      /* Red */
    --accent-color: #0066CC;         /* Bright Blue */
    --background-light: #F5F5F5;     /* Light Gray */
    --background-white: #FFFFFF;     /* White */
    --text-dark: #1a1a1a;            /* Almost Black */
    --text-medium: #4a4a4a;          /* Medium Gray */
    --border-color: #D1D5DB;         /* Light Border */
    --header-bg: #002447;            /* Dark Navy */
}

body {
    font-family: 'Arial', 'Helvetica Neue', sans-serif;
    background: var(--background-light);
    color: var(--text-dark);
    line-height: 1.6;
}

header {
    background: var(--header-bg);
    padding: 2rem;
    text-align: center;
    border-bottom: 4px solid var(--secondary-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: #FFFFFF;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

header p {
    color: #E0E0E0;
    font-size: 1.1rem;
}

#mainNav {
    background: var(--background-white);
    padding: 1rem;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 3px solid var(--primary-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}

.nav-btn {
    background: var(--background-white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    border-radius: 0;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-btn:hover {
    background: var(--primary-color);
    color: var(--background-white);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

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

main {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
    background: var(--background-white);
    box-shadow: 0 0 20px rgba(0,0,0,0.08);
}

.content-section {
    display: none;
    animation: fadeIn 0.5s;
    padding: 2rem;
    background: var(--background-white);
}

.content-section.active {
    display: block;
}

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

h2 {
    color: var(--primary-color);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    border-bottom: 3px solid var(--secondary-color);
    padding-bottom: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

h3 {
    color: var(--primary-color);
    margin: 1.5rem 0 1rem;
    font-size: 1.5rem;
    font-weight: 600;
    border-left: 4px solid var(--secondary-color);
    padding-left: 1rem;
}

h4 {
    color: var(--text-dark);
    margin: 1rem 0 0.5rem;
    font-weight: 600;
}

.prose-section {
    background: #F8F9FA;
    padding: 2rem;
    margin: 2rem 0;
    border-radius: 0;
    border-left: 5px solid var(--primary-color);
    border-right: 1px solid var(--border-color);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    line-height: 1.8;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.prose-section p {
    margin-bottom: 1.5rem;
    text-align: justify;
    font-size: 1.05rem;
    color: var(--text-dark);
}

.prose-section p:last-child {
    margin-bottom: 0;
}

.prose-section a {
    color: var(--accent-color);
    text-decoration: none;
    border-bottom: 1px solid var(--accent-color);
    transition: all 0.2s;
    font-weight: 500;
}

.prose-section a:hover {
    color: var(--secondary-color);
    border-bottom: 2px solid var(--secondary-color);
}

.caption {
    font-size: 0.9rem;
    font-style: italic;
    color: var(--text-medium);
    margin-top: 0.5rem;
    text-align: center;
}

.advantages-section {
    margin: 3rem 0;
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.advantage-card {
    background: #F0F4F8;
    padding: 1.5rem;
    border-radius: 0;
    border: 2px solid var(--primary-color);
    border-left: 5px solid var(--secondary-color);
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.advantage-card:hover {
    background: #E8EFF5;
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0,51,102,0.12);
}

.advantage-card h4 {
    color: var(--primary-color);
    margin-top: 0;
    font-size: 1.2rem;
    font-weight: 700;
}

.advantage-card p {
    color: var(--text-dark);
}

.references-section {
    background: #FAFBFC;
    padding: 2rem;
    margin: 3rem 0;
    border-radius: 0;
    border: 2px solid var(--border-color);
    border-left: 5px solid var(--secondary-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.references-section h3 {
    color: var(--primary-color);
    margin-top: 0;
    font-weight: 700;
}

.references-section ol {
    list-style-position: outside;
    padding-left: 2rem;
    color: var(--text-dark);
}

.references-section li {
    margin: 1rem 0;
    line-height: 1.6;
}

.references-section a {
    color: var(--accent-color);
    text-decoration: none;
    word-break: break-word;
    font-weight: 500;
}

.references-section a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

.intro-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.intro-card {
    background: var(--background-white);
    padding: 1.5rem;
    border-radius: 0;
    border: 2px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}

.intro-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0,51,102,0.15);
    border-top-color: var(--secondary-color);
}

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

.intro-card li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-dark);
}

.intro-card li:last-child {
    border-bottom: none;
}

.intro-card h3 {
    color: var(--primary-color);
    font-weight: 700;
    border-left: none;
    padding-left: 0;
}

.intro-card p {
    color: var(--text-dark);
}

.theory-block {
    background: var(--background-white);
    padding: 2rem;
    margin: 2rem 0;
    border-radius: 0;
    border: 1px solid var(--border-color);
    border-left: 5px solid var(--accent-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.theory-block > p {
    color: var(--text-dark);
}

.equation-explanation {
    background: #F0F7FF;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border: 2px solid var(--accent-color);
    border-left: 5px solid var(--primary-color);
}

.equation-explanation h4 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    font-size: 1.1rem;
}

.equation-explanation p {
    margin: 1rem 0;
    color: var(--text-dark);
    line-height: 1.7;
}

.equation-explanation ul {
    margin: 1rem 0;
    padding-left: 2rem;
}

.equation-explanation li {
    margin: 0.75rem 0;
    color: var(--text-dark);
    line-height: 1.6;
}

.equation-explanation strong {
    color: var(--primary-color);
}

.equation-explanation em {
    color: var(--secondary-color);
    font-style: italic;
}

.formula {
    background: #F8F9FA;
    padding: 1.5rem;
    margin: 1rem 0;
    border-radius: 0;
    border: 2px solid var(--border-color);
    text-align: center;
    font-size: 1.2rem;
    overflow-x: auto;
}

.interactive-calc {
    background: #F0F7FF;
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0;
    border: 2px solid var(--accent-color);
    border-top: 4px solid var(--primary-color);
}

.interactive-calc label {
    display: block;
    margin: 1rem 0;
    color: var(--text-dark);
    font-weight: 500;
}

.interactive-calc input {
    margin-left: 1rem;
    padding: 0.5rem;
    border-radius: 0;
    border: 2px solid var(--border-color);
    background: var(--background-white);
    color: var(--text-dark);
    width: 100px;
    font-weight: 500;
}

.interactive-calc input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.interactive-calc h5 {
    color: var(--primary-color);
    margin: 1rem 0 0.5rem;
    font-weight: 600;
}

.comparison-calc {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin: 1rem 0;
}

.calc-column {
    background: var(--background-white);
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-top: 3px solid var(--primary-color);
}

.calc-column h5 {
    color: var(--primary-color);
    margin-top: 0;
    font-weight: 700;
    text-align: center;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.result-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin: 1rem 0;
}

.result-col {
    background: #F8F9FA;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-left: 4px solid var(--accent-color);
}

.result-col h5 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 0.75rem;
    font-weight: 700;
}

.result-col p {
    margin: 0.5rem 0;
    color: var(--text-dark);
}

.result-summary {
    background: #F0F7FF;
    padding: 1rem;
    margin-top: 1rem;
    border: 2px solid var(--accent-color);
    border-left: 5px solid var(--secondary-color);
}

.result-summary p {
    margin: 0.5rem 0;
    color: var(--text-dark);
}

.result-summary strong {
    color: var(--primary-color);
}

.result-summary hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 0.75rem 0;
}

.toggle-group {
    background: #F8F9FA;
    padding: 1rem;
    margin: 1rem 0;
    border: 1px solid var(--border-color);
}

.toggle-group h5 {
    color: var(--primary-color);
    margin: 0 0 0.75rem 0;
    font-weight: 700;
}

.toggle-group label {
    display: block;
    margin: 0.5rem 0;
    color: var(--text-dark);
    font-weight: 500;
    cursor: pointer;
}

.toggle-group input[type="checkbox"],
.toggle-group input[type="radio"] {
    margin-right: 0.5rem;
    accent-color: var(--secondary-color);
    cursor: pointer;
}

.toggle-group label:hover {
    color: var(--primary-color);
}

.comparison-btn {
    display: inline-block;
    margin: 0.5rem 0.5rem 0.5rem 0;
    padding: 0.5rem 1rem;
    background: var(--background-white);
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    border-radius: 0;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
    font-size: 0.9rem;
}

.comparison-btn:hover {
    background: var(--accent-color);
    color: white;
}

.planck-controls,
.atmosphere-controls {
    margin-top: 1rem;
}

.atmos-result {
    background: var(--background-white);
    padding: 1rem;
    margin-top: 1rem;
    border: 2px solid var(--border-color);
    border-left: 5px solid var(--accent-color);
}

.atmos-result p {
    margin: 0.5rem 0;
    color: var(--text-dark);
}

.atmos-result strong {
    color: var(--primary-color);
}

.interactive-calc button,
button.primary-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 0;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    margin-top: 1rem;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.interactive-calc button:hover,
button.primary-btn:hover {
    background: var(--secondary-color);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

button.secondary-btn {
    background: var(--background-white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.75rem 1.5rem;
    border-radius: 0;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    margin-left: 1rem;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.johnson-table {
    width: 100%;
    max-width: 900px;
    margin: 1rem 0;
    border-collapse: collapse;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}

.johnson-table th,
.johnson-table td {
    padding: 1rem;
    border: 1px solid var(--border-color);
    text-align: left;
}

.johnson-table th {
    background: var(--primary-color);
    color: white;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.johnson-table td {
    background: var(--background-white);
    color: var(--text-dark);
}

.johnson-table td:nth-child(2) {
    text-align: center;
    font-weight: bold;
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.johnson-table tr:nth-child(even) td {
    background: #F8F9FA;
}

.johnson-table tr:hover td {
    background: #E8F0FE;
}

.hardware-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

#three-container {
    background: #E8EFF5;
    border-radius: 0;
    height: 500px;
    border: 3px solid var(--primary-color);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
}

.controls-panel {
    background: var(--background-white);
    padding: 1.5rem;
    border-radius: 0;
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.controls-panel h3 {
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
    color: var(--primary-color);
    border-bottom: 1px solid rgba(255, 69, 0, 0.3);
    padding-bottom: 0.3rem;
}

.controls-panel h3:first-child {
    margin-top: 0;
}

#component-info {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

#component-info button {
    flex: 1;
    padding: 0.75rem;
    background: var(--background-white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: 0;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

#component-info button:hover {
    background: var(--primary-color);
    color: white;
}

button.explode-btn {
    background: var(--secondary-color);
    font-weight: bold;
    color: white;
    border: none;
}

button.explode-btn:hover {
    background: #A01829;
}

.component-toggles {
    background: #F0F4F8;
    padding: 1rem;
    border-radius: 0;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
}

.component-toggles label {
    display: flex;
    align-items: center;
    padding: 0.5rem;
    margin: 0.3rem 0;
    cursor: pointer;
    border-radius: 0;
    transition: background 0.2s;
    color: var(--text-dark);
    font-weight: 500;
}

.component-toggles label:hover {
    background: #E8EFF5;
}

.component-toggles input[type="checkbox"] {
    margin-right: 0.75rem;
    cursor: pointer;
    width: 18px;
    height: 18px;
    accent-color: var(--secondary-color);
}

.focus-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.focus-buttons button {
    padding: 0.5rem;
    background: var(--background-white);
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
    border-radius: 0;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.85rem;
    font-weight: 600;
}

.focus-buttons button:hover {
    background: var(--accent-color);
    color: white;
}

#component-details {
    background: #F0F7FF;
    padding: 1rem;
    border-radius: 0;
    border: 2px solid var(--accent-color);
    border-left: 4px solid var(--primary-color);
    margin-top: 1rem;
}

#component-details h4 {
    color: var(--primary-color);
    margin-top: 0;
}

#component-details ul {
    color: var(--text-dark);
}

#component-details li {
    margin: 0.5rem 0;
}

.hardware-specs {
    margin-top: 2rem;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 1rem;
}

.spec-card {
    background: var(--background-white);
    padding: 1.5rem;
    border-radius: 0;
    border: 2px solid var(--border-color);
    border-top: 4px solid var(--accent-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.spec-card h4 {
    color: var(--primary-color);
    font-weight: 700;
}

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

.spec-card li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-dark);
}

.spec-card li:last-child {
    border-bottom: none;
}

.dataset-controls {
    background: #FAFBFC;
    padding: 2rem;
    border-radius: 0;
    margin-bottom: 2rem;
    border: 2px solid var(--border-color);
    border-left: 5px solid var(--primary-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.advanced-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.control-group {
    margin: 1.5rem 0;
}

.control-group select {
    padding: 0.5rem;
    border: 2px solid var(--border-color);
    border-radius: 0;
    background: var(--background-white);
    color: var(--text-dark);
    font-weight: 500;
    min-width: 200px;
    cursor: pointer;
}

.control-group select:focus {
    outline: none;
    border-color: var(--accent-color);
}

.button-group {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

.control-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
    font-weight: 600;
}

.control-group input[type="range"] {
    width: 100%;
    max-width: 400px;
    margin-right: 1rem;
}

.dataset-display {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.image-viewer {
    background: var(--background-white);
    padding: 1.5rem;
    border-radius: 0;
    border: 3px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

#thermal-canvas {
    display: block;
    max-width: 100%;
    border: 1px solid rgba(255, 69, 0, 0.5);
    image-rendering: pixelated;
}

.colorbar {
    display: flex;
    margin-top: 1rem;
    align-items: center;
}

.colorbar-labels {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 240px;
    margin-left: 1rem;
}

.data-stats {
    background: #F8F9FA;
    padding: 1.5rem;
    border-radius: 0;
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.data-stats h3 {
    color: var(--primary-color);
    border-left: none;
    padding-left: 0;
}

#stats-display p {
    margin: 0.5rem 0;
    color: var(--text-dark);
}

#stats-display strong {
    color: var(--primary-color);
}

.presets {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.presets button {
    background: var(--background-white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 1rem 1.5rem;
    border-radius: 0;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.presets button:hover {
    background: var(--primary-color);
    color: white;
}

.presets button:active,
.presets button.active {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
    color: white;
}

.analysis-container {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.analysis-viewer {
    background: var(--background-white);
    padding: 1.5rem;
    border-radius: 0;
    border: 3px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

#analysis-canvas {
    display: block;
    max-width: 100%;
    border: 1px solid rgba(255, 69, 0, 0.5);
    margin-bottom: 1rem;
}

.processing-chain {
    display: flex;
    justify-content: space-around;
    margin-top: 1rem;
}

.process-step {
    padding: 0.75rem 1rem;
    background: var(--background-white);
    border-radius: 0;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid var(--border-color);
    color: var(--text-dark);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
}

.process-step:hover {
    background: #E8F0FE;
    border-color: var(--accent-color);
}

.process-step.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.analysis-controls {
    background: #FAFBFC;
    padding: 1.5rem;
    border-radius: 0;
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.tool-section {
    margin: 1.5rem 0;
    padding: 1rem;
    background: #F0F4F8;
    border-radius: 0;
    border: 1px solid var(--border-color);
}

.tool-section h4 {
    color: var(--primary-color);
    font-weight: 700;
}

.tool-section button {
    margin: 0.5rem 0.5rem 0.5rem 0;
    padding: 0.5rem 1rem;
    background: var(--background-white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: 0;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
}

.tool-section button:hover {
    background: var(--primary-color);
    color: white;
}

.tool-section label {
    display: block;
    margin: 1rem 0;
}

.tool-section input[type="range"] {
    width: 100%;
    max-width: 300px;
}

button.reset-btn {
    width: 100%;
    margin-top: 1rem;
    padding: 0.75rem;
    background: var(--text-medium);
    color: white;
    border: none;
    border-radius: 0;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

button.reset-btn:hover {
    background: var(--text-dark);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

#detection-results {
    color: var(--text-dark);
}

#detection-results strong {
    color: var(--primary-color);
}

#detection-results p {
    margin: 0.5rem 0;
}

.analysis-results {
    background: #F8F9FA;
    padding: 1.5rem;
    border-radius: 0;
    margin-top: 2rem;
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.analysis-results h3 {
    color: var(--primary-color);
}

.simulation-container {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.sim-viewer {
    background: var(--background-white);
    padding: 1.5rem;
    border-radius: 0;
    border: 3px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

#sim-canvas {
    display: block;
    max-width: 100%;
    border: 1px solid rgba(255, 69, 0, 0.5);
    margin-bottom: 1rem;
}

.sim-controls-inline {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
}

.sim-controls-inline button {
    flex: 1;
    padding: 0.75rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sim-controls-inline button:hover {
    background: var(--secondary-color);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.sim-controls {
    background: #FAFBFC;
    padding: 1.5rem;
    border-radius: 0;
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.sim-param {
    margin: 1.5rem 0;
    padding: 1rem;
    background: #F0F4F8;
    border-radius: 0;
    border: 1px solid var(--border-color);
}

.sim-param h4 {
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 1rem;
}

.sim-param label {
    display: block;
    margin: 1rem 0;
}

.sim-param label {
    color: var(--text-dark);
    font-weight: 500;
}

.sim-param input,
.sim-param select {
    margin-left: 1rem;
    padding: 0.5rem;
    border-radius: 0;
    border: 2px solid var(--border-color);
    background: var(--background-white);
    color: var(--text-dark);
    font-weight: 500;
}

.sim-param input:focus,
.sim-param select:focus {
    outline: none;
    border-color: var(--accent-color);
}

#sim-metrics {
    background: #F0F7FF;
    padding: 1rem;
    border-radius: 0;
    border: 2px solid var(--accent-color);
}

#sim-metrics p {
    margin: 0.75rem 0;
    font-size: 1.1rem;
    color: var(--text-dark);
}

#sim-metrics strong {
    color: var(--primary-color);
}

#sim-metrics span {
    color: var(--secondary-color);
    font-weight: 700;
}

.performance-calc {
    background: #F8F9FA;
    padding: 2rem;
    border-radius: 0;
    margin-top: 2rem;
    border: 2px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.calc-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.calc-inputs label {
    display: flex;
    flex-direction: column;
}

.calc-inputs input {
    margin-top: 0.5rem;
    padding: 0.5rem;
    border-radius: 0;
    border: 2px solid var(--border-color);
    background: var(--background-white);
    color: var(--text-dark);
    font-weight: 500;
}

.calc-inputs input:focus {
    outline: none;
    border-color: var(--accent-color);
}

#range-result {
    background: #F0F7FF;
    padding: 1.5rem;
    margin-top: 1rem;
    border-radius: 0;
    border: 2px solid var(--accent-color);
    border-left: 5px solid var(--secondary-color);
    font-size: 1.1rem;
    color: var(--text-dark);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

#range-result strong {
    color: var(--primary-color);
}

#range-result hr {
    border-color: var(--border-color);
}

#range-result span {
    color: var(--secondary-color);
}

footer {
    background: var(--header-bg);
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
    border-top: 4px solid var(--secondary-color);
    color: #E0E0E0;
}

canvas {
    max-width: 100%;
    height: auto;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .hardware-container,
    .dataset-display,
    .analysis-container,
    .simulation-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .nav-btn {
        padding: 0.5rem 1rem;
        font-size: 0.9rem;
    }

    main {
        padding: 0 1rem;
    }

    .intro-grid {
        grid-template-columns: 1fr;
    }

    .calc-inputs {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   STEEL INSPECTION SECTION STYLES
   ============================================ */

.steel-fundamentals {
    margin: 2rem 0;
}

.fundamentals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.fundamental-card {
    background: var(--background-light);
    padding: 1.5rem;
    border-left: 5px solid var(--secondary-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.fundamental-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.fundamental-card .formula {
    background: var(--background-white);
    padding: 1rem;
    margin: 1rem 0;
    border: 1px solid var(--border-color);
    text-align: center;
}

.fundamental-card .small-text {
    font-size: 0.9rem;
    color: var(--text-medium);
    margin-top: 0.5rem;
}

.compact-list {
    margin-left: 1rem;
    font-size: 0.95rem;
}

.compact-list li {
    margin: 0.3rem 0;
}

.defect-showcase {
    display: grid;
    grid-template-columns: 200px 1fr 300px;
    gap: 1.5rem;
    margin-top: 1.5rem;
    min-height: 400px;
}

.defect-type-selector {
    background: var(--background-light);
    padding: 1rem;
    border-right: 3px solid var(--primary-color);
}

.defect-type-selector h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

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

.defect-btn {
    background: var(--background-white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.75rem;
    cursor: pointer;
    font-weight: 600;
    text-align: left;
    transition: all 0.2s;
    border-radius: 0;
}

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

.defect-btn.active {
    background: var(--primary-color);
    color: var(--background-white);
    border-left: 5px solid var(--secondary-color);
}

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

.defect-canvas-container {
    text-align: center;
}

.defect-canvas-container h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

#steel-thermal-canvas {
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    display: block;
    margin: 0 auto;
}

.temp-scale-horizontal {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.temp-label-cold,
.temp-label-hot {
    font-weight: 600;
    color: var(--text-medium);
    font-size: 0.9rem;
}

#steel-colorbar {
    border: 1px solid var(--border-color);
}

.defect-profile {
    text-align: center;
}

.defect-profile h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

#steel-profile-canvas {
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.defect-description {
    background: var(--background-light);
    padding: 1.5rem;
    border-left: 5px solid var(--accent-color);
}

#defect-info h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

#defect-info p {
    margin-bottom: 0.8rem;
    line-height: 1.7;
}

#defect-info strong {
    color: var(--secondary-color);
}

.steel-simulator {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 2rem;
    margin-top: 1.5rem;
}

.sim-controls-steel {
    background: var(--background-light);
    padding: 1.5rem;
    border-left: 5px solid var(--primary-color);
}

.sim-controls-steel h4 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

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

.steel-canvas-wrapper {
    position: relative;
}

.steel-canvas-wrapper h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

#steel-sim-canvas {
    border: 2px solid var(--border-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    width: 100%;
}

.detection-overlay {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
}

.inspection-results {
    background: var(--background-light);
    padding: 1.5rem;
    border-left: 5px solid var(--accent-color);
}

.inspection-results h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.instruction-text {
    color: var(--text-medium);
    font-style: italic;
}

.inspection-result {
    padding: 1.5rem;
    border-radius: 0;
    margin-bottom: 1.5rem;
}

.inspection-result.detectable {
    background: #E8F5E9;
    border: 2px solid #4CAF50;
    border-left: 5px solid #2E7D32;
}

.inspection-result.not-detectable {
    background: #FFEBEE;
    border: 2px solid #F44336;
    border-left: 5px solid #C62828;
}

.inspection-result h5 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.success-msg {
    color: #2E7D32;
    font-weight: 600;
    background: #C8E6C9;
    padding: 0.75rem;
    margin-top: 1rem;
    border-left: 4px solid #4CAF50;
}

.warning-msg {
    color: #D84315;
    font-weight: 600;
    background: #FFE0B2;
    padding: 0.75rem;
    margin-top: 1rem;
    border-left: 4px solid #FF6F00;
}

.physics-analysis {
    background: var(--background-white);
    padding: 1rem;
    border: 1px solid var(--border-color);
    margin-top: 1rem;
}

.physics-analysis h5 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.emissivity-calc {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 1.5rem 0;
}

.emissivity-calc h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.info-box {
    background: #FFF9E6;
    padding: 1rem;
    border-left: 4px solid #FF8800;
    border-radius: 0;
}

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

.decay-controls {
    margin-top: 1.5rem;
}

.decay-controls label {
    display: block;
    margin-bottom: 1rem;
    font-weight: 600;
}

#decay-analysis {
    background: var(--background-light);
    padding: 1rem;
    margin-top: 1.5rem;
    border-left: 4px solid var(--accent-color);
}

.comparison-section {
    margin: 3rem 0;
}

.comparison-table {
    width: 100%;
    margin-top: 1.5rem;
    border-collapse: collapse;
    background: var(--background-white);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.comparison-table thead {
    background: var(--primary-color);
    color: var(--background-white);
}

.comparison-table th,
.comparison-table td {
    padding: 1rem;
    text-align: left;
    border: 1px solid var(--border-color);
}

.comparison-table th {
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.comparison-table tbody tr:nth-child(even) {
    background: var(--background-light);
}

.comparison-table tbody tr:hover {
    background: #E8F0FE;
}

.steel-calc-inputs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin: 1.5rem 0;
}

.calc-section {
    background: var(--background-light);
    padding: 1.5rem;
    border-left: 4px solid var(--accent-color);
}

.calc-section h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.calc-section label {
    display: block;
    margin-bottom: 1rem;
    font-weight: 500;
}

.calc-section input {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.3rem;
    border: 2px solid var(--border-color);
    background: var(--background-white);
    font-size: 0.95rem;
}

.calc-section input:focus {
    outline: none;
    border-color: var(--accent-color);
}

#defect-calc-result .result-summary {
    background: var(--background-light);
    padding: 2rem;
    margin-top: 1.5rem;
    border-left: 5px solid var(--primary-color);
}

.calc-result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.calc-result-item {
    background: var(--background-white);
    padding: 1rem;
    border: 2px solid var(--border-color);
    text-align: center;
}

.calc-result-item strong {
    color: var(--primary-color);
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.calc-result-item p {
    margin: 0.3rem 0;
}

.detection-verdict {
    padding: 1.5rem;
    margin: 1.5rem 0;
    border-radius: 0;
}

.verdict-pass {
    background: #E8F5E9;
    border: 3px solid #4CAF50;
    border-left: 6px solid #2E7D32;
}

.verdict-fail {
    background: #FFEBEE;
    border: 3px solid #F44336;
    border-left: 6px solid #C62828;
}

.detection-verdict h5 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.recommendations {
    background: var(--background-white);
    padding: 1rem;
    border: 1px solid var(--border-color);
    margin-top: 1rem;
}

.recommendations h5 {
    color: var(--primary-color);
    margin-bottom: 0.8rem;
}

.recommendations ul {
    margin-left: 1.5rem;
}

.recommendations li {
    margin: 0.5rem 0;
    line-height: 1.6;
}

.physics-note {
    background: #E3F2FD;
    padding: 1rem;
    margin-top: 1rem;
    border-left: 4px solid var(--accent-color);
    font-size: 0.95rem;
}

.application-examples {
    margin: 3rem 0;
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.example-card {
    background: var(--background-white);
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-top: 5px solid var(--primary-color);
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
}

.example-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.example-card h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.example-card p {
    margin-bottom: 0.8rem;
    line-height: 1.6;
}

.timeline-section {
    margin-top: 1.5rem;
}

.timeline-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.timeline-item:last-child {
    border-bottom: none;
}

.timeline-year {
    background: var(--primary-color);
    color: var(--background-white);
    padding: 1rem;
    text-align: center;
    font-weight: 700;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.timeline-content {
    background: var(--background-light);
    padding: 1.5rem;
    border-left: 4px solid var(--secondary-color);
}

.timeline-content strong {
    color: var(--primary-color);
    font-size: 1.1rem;
    display: block;
    margin-bottom: 0.8rem;
}

.limitation-card {
    border-top: 5px solid var(--secondary-color);
}

.case-study {
    margin: 3rem 0;
    background: var(--background-light);
    padding: 2rem;
    border: 3px solid var(--primary-color);
    border-radius: 0;
}

.case-study h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
    text-align: center;
    border-bottom: 2px solid var(--secondary-color);
    padding-bottom: 0.5rem;
}

.case-study-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.case-scenario,
.case-solution,
.case-results {
    background: var(--background-white);
    padding: 1.5rem;
    border-left: 5px solid var(--accent-color);
}

.case-study h4 {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.case-study p {
    margin-bottom: 0.8rem;
    line-height: 1.7;
}

.practical-guidance {
    margin: 3rem 0;
}

.guidance-content {
    background: var(--background-light);
    padding: 2rem;
    border-left: 6px solid var(--primary-color);
    margin-top: 1.5rem;
}

.guidance-content p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
    text-align: justify;
}

.comparison-btn {
    background: var(--background-white);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.6rem 1.2rem;
    margin: 0.3rem;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
}

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

/* Responsive adjustments for steel section */
@media (max-width: 1024px) {
    .defect-showcase {
        grid-template-columns: 1fr;
    }
    
    .steel-simulator {
        grid-template-columns: 1fr;
    }
    
    .steel-calc-inputs {
        grid-template-columns: 1fr;
    }
    
    .case-study-content {
        grid-template-columns: 1fr;
    }
    
    .timeline-item {
        grid-template-columns: 100px 1fr;
        gap: 1rem;
    }
}

@media (max-width: 768px) {
    .fundamentals-grid {
        grid-template-columns: 1fr;
    }
    
    .examples-grid {
        grid-template-columns: 1fr;
    }
    
    .emissivity-calc {
        grid-template-columns: 1fr;
    }
}