/* ==========================================================================
   PrayogSetu - Thermocouple Temperature Measurement Virtual Experiment
   ========================================================================== */

/* CSS Variables / Theme Tokens */
:root {
    --bg-main: #f1f5f9;
    --bg-card: #ffffff;
    --bg-header: #0f172a;
    --bg-header-card: #1e293b;
    
    --text-main: #334155;
    --text-heading: #0f172a;
    --text-muted: #64748b;
    --text-light: #f8fafc;

    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --primary-border: #bfdbfe;

    --secondary: #475569;
    --secondary-hover: #334155;

    --accent-cyan: #06b6d4;
    --accent-orange: #f97316;
    --accent-red: #ef4444;
    --accent-yellow: #eab308;
    --accent-green: #22c55e;

    --border-color: #e2e8f0;
    --border-dark: #cbd5e1;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05), 0 1px 2px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

/* Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.app-header {
    background-color: var(--bg-header);
    color: var(--text-light);
    padding: 0.85rem 1.5rem;
    box-shadow: var(--shadow-md);
    border-bottom: 3px solid var(--primary);
}

.header-container {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

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

.logo-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--primary), var(--accent-cyan));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: #ffffff;
    box-shadow: 0 0 12px rgba(37, 99, 235, 0.4);
}

.brand-title h1 {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: #ffffff;
}

.brand-title h1 span {
    color: var(--accent-cyan);
    font-weight: 500;
    font-size: 1rem;
    margin-left: 0.25rem;
}

.subtitle {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-weight: 400;
}

.experiment-badge-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.exp-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: #f1f5f9;
}

.badge {
    padding: 0.35rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.diploma-badge {
    background-color: rgba(37, 99, 235, 0.25);
    color: #93c5fd;
    border: 1px solid rgba(147, 197, 253, 0.3);
}

.badge-info {
    background-color: var(--primary-light);
    color: var(--primary);
    border: 1px solid var(--primary-border);
}

.status-header-pills {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.status-pill {
    background: var(--bg-header-card);
    border: 1px solid rgba(255,255,255,0.1);
    padding: 0.35rem 0.75rem;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 90px;
}

.pill-label {
    font-size: 0.68rem;
    color: var(--text-muted);
    text-transform: uppercase;
    font-weight: 600;
}

.pill-value {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-cyan);
}

.status-idle { color: #94a3b8; }
.status-heating { color: var(--accent-orange); }
.status-cooling { color: #38bdf8; }
.status-stable { color: var(--accent-green); }

/* Main Container Layout */
.main-container {
    max-width: 1600px;
    width: 100%;
    margin: 1.25rem auto;
    padding: 0 1.25rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

/* Card Styling */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card-header {
    padding: 0.85rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    background-color: #fafafa;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h2 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-heading);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-header h2 i {
    color: var(--primary);
}

.card-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.view-indicator-pill {
    background-color: var(--primary-light);
    color: var(--primary);
    border: 1px solid var(--primary-border);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-sm);
}

/* ============================================================
   SVG SETUP CARD - FULL WIDTH, LARGE
   ============================================================ */
.setup-card {
    width: 100%;
}

.svg-container {
    padding: 0.5rem;
    background-color: #f8fafc;
    display: flex;
    align-items: center;
    justify-content: center;
}

.svg-container svg {
    width: 100%;
    height: auto;
    min-height: 500px;
    max-height: 75vh;
    border-radius: var(--radius-md);
}

/* SVG Text & Labels */
.svg-label {
    font-family: var(--font-sans);
    font-size: 12px;
    fill: #475569;
}

.svg-label-bold {
    font-family: var(--font-sans);
    font-size: 12px;
    font-weight: 700;
    fill: #0f172a;
}

.svg-internal-label {
    font-family: var(--font-sans);
    font-size: 11px;
    font-weight: 600;
}

.svg-internal-label-bold {
    font-family: var(--font-sans);
    font-size: 11px;
    font-weight: 800;
}

/* SVG Animations */
.flame-off {
    display: none;
}

.flame-on {
    display: block;
}

@keyframes flameFlicker1 {
    0%, 100% { transform: scale(1) translateY(0); opacity: 0.95; }
    50% { transform: scale(1.05, 0.96) translateY(-2px); opacity: 0.85; }
}

@keyframes flameFlicker2 {
    0%, 100% { transform: scale(1) translateY(0); opacity: 0.9; }
    50% { transform: scale(0.95, 1.04) translateY(1px); opacity: 1; }
}

.flame-anim-1 {
    transform-origin: 0px 28px;
    animation: flameFlicker1 0.35s infinite ease-in-out;
}

.flame-anim-2 {
    transform-origin: 0px 28px;
    animation: flameFlicker2 0.25s infinite ease-in-out;
}

/* Heat Waves Drifting */
@keyframes waveDrift {
    0% { transform: translateY(0); opacity: 0.6; }
    100% { transform: translateY(-25px); opacity: 0; }
}

.heat-wave {
    animation: waveDrift 1.2s infinite linear;
}
.wave2 { animation-delay: 0.4s; }
.wave3 { animation-delay: 0.8s; }

/* Pulse Rings */
@keyframes ringExpand {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(1.1); opacity: 0; }
}

.pulse-ring-1 { transform-origin: 0px 95px; animation: ringExpand 1.5s infinite ease-out; }
.pulse-ring-2 { transform-origin: 0px 95px; animation: ringExpand 1.5s infinite ease-out 0.75s; }

/* ============================================================
   CONTROLS & READINGS ROW (below SVG, 2-column horizontal)
   ============================================================ */
.controls-readings-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
}

@media (max-width: 900px) {
    .controls-readings-row {
        grid-template-columns: 1fr;
    }
}

/* Controls Card Body */
.controls-card {
    padding: 1.25rem;
    gap: 1rem;
}

/* Action Buttons */
.button-group-primary {
    display: grid;
    grid-template-columns: 1fr 1fr 0.8fr;
    gap: 0.75rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 1.1rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: var(--font-sans);
}

.btn-lg {
    padding: 0.8rem 1.25rem;
    font-size: 0.95rem;
}

.btn-sm {
    padding: 0.35rem 0.7rem;
    font-size: 0.8rem;
}

.btn-primary {
    background-color: var(--primary);
    color: #ffffff;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.35);
}

.btn-warning {
    background-color: var(--accent-orange);
    color: #ffffff;
}

.btn-warning:hover:not(:disabled) {
    background-color: #ea580c;
}

.btn-secondary {
    background-color: var(--secondary);
    color: #ffffff;
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--secondary-hover);
}

.btn-outline {
    background-color: #ffffff;
    border-color: var(--border-dark);
    color: var(--text-main);
}

.btn-outline:hover:not(:disabled) {
    background-color: #f8fafc;
    border-color: var(--primary);
    color: var(--primary);
}

.btn-danger-outline {
    background-color: #ffffff;
    border-color: #fca5a5;
    color: #dc2626;
}

.btn-danger-outline:hover:not(:disabled) {
    background-color: #fef2f2;
    border-color: #dc2626;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-block {
    width: 100%;
}

.highlight-row {
    background-color: var(--primary-light);
    border: 1px solid var(--primary-border);
    padding: 0.75rem;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Control Group Structure */
.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-label {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-heading);
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.control-label i {
    color: var(--primary);
}

/* Thermocouple Selector Grid */
.tc-type-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.6rem;
}

.tc-type-btn {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 0.55rem 0.75rem;
    background-color: #ffffff;
    border: 1.5px solid var(--border-dark);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s ease;
    text-align: left;
}

.tc-type-btn .tc-name {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--text-heading);
}

.tc-type-btn .tc-mat {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.tc-type-btn:hover {
    border-color: var(--primary);
    background-color: #f8fafc;
}

.tc-type-btn.active {
    border-color: var(--primary);
    background-color: var(--primary-light);
    box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.2);
}

.tc-type-btn.active .tc-name {
    color: var(--primary);
}

/* Flame Segmented Control */
.segmented-control {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    background-color: #f1f5f9;
    padding: 0.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.segment-btn {
    padding: 0.45rem;
    font-size: 0.82rem;
    font-weight: 700;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.segment-btn.active {
    background-color: #ffffff;
    color: var(--accent-orange);
    box-shadow: var(--shadow-sm);
}

/* Range Slider */
.slider-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.slider-value-display {
    font-family: var(--font-mono);
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    background-color: var(--primary-light);
    padding: 0.2rem 0.6rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--primary-border);
}

.styled-slider {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: #cbd5e1;
    outline: none;
    accent-color: var(--primary);
    cursor: pointer;
}

.preset-pills {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 0.4rem;
    flex-wrap: wrap;
}

.preset-title {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
}

.preset-btn {
    background-color: #f1f5f9;
    border: 1px solid var(--border-dark);
    font-size: 0.73rem;
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-main);
    transition: all 0.15s ease;
}

.preset-btn:hover {
    background-color: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

/* Readings Card */
.readings-card {
    padding: 1.25rem;
    gap: 1rem;
}

.readings-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.reading-box {
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    padding: 0.85rem;
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.reading-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
}

.reading-value {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-heading);
}

.highlight-box {
    background-color: #fff7ed;
    border-color: #ffedd5;
}

.highlight-box .reading-value {
    color: #c2410c;
}

.highlight-box-voltage {
    background-color: #f0fdf4;
    border-color: #bbf7d0;
}

.voltage-text {
    color: #15803d !important;
}

.tc-info-panel {
    background-color: #fafafa;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.85rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    border-left: 4px solid var(--primary);
}

.info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.82rem;
}

.info-title {
    font-weight: 600;
    color: var(--text-muted);
}

.info-detail {
    font-weight: 700;
    color: var(--text-heading);
    font-family: var(--font-mono);
    font-size: 0.78rem;
}

/* Bottom Section Tabs */
.bottom-card {
    padding: 0;
}

.tabs-header {
    display: flex;
    background-color: #fafafa;
    border-bottom: 1px solid var(--border-color);
    overflow-x: auto;
}

.tab-btn {
    padding: 0.9rem 1.4rem;
    background: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.tab-btn:hover {
    color: var(--primary);
    background-color: rgba(37, 99, 235, 0.03);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background-color: #ffffff;
}

.tabs-body {
    padding: 1.25rem;
}

.tab-pane {
    display: none;
}

.tab-pane.active {
    display: block;
}

/* Observation Table Styles */
.table-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.action-left, .action-right {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.table-responsive {
    overflow-x: auto;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
    text-align: left;
}

.data-table th {
    background-color: #f1f5f9;
    color: var(--text-heading);
    padding: 0.75rem 1rem;
    font-weight: 700;
    border-bottom: 2px solid var(--border-dark);
}

.data-table td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
    font-family: var(--font-mono);
}

.data-table tbody tr:nth-child(even) {
    background-color: #fafafa;
}

.data-table tbody tr:hover {
    background-color: var(--primary-light);
}

.empty-table-msg {
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    padding: 2rem !important;
}

/* Graph Tab Styles */
.graph-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.chart-header h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-heading);
}

.chart-legend-info {
    display: flex;
    gap: 0.6rem;
}

.legend-chip {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 9999px;
}

.live-chip { background-color: var(--primary-light); color: var(--primary); border: 1px solid var(--primary-border); }
.ref-chip { background-color: #f1f5f9; color: var(--text-muted); border: 1px solid var(--border-dark); }

.chart-wrapper {
    height: 380px;
    width: 100%;
    position: relative;
}

/* Theory & Flow Steps */
.theory-container {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.theory-intro h3 {
    font-size: 1.1rem;
    color: var(--text-heading);
    margin-bottom: 0.5rem;
}

.flow-steps-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 0.75rem;
}

@media (max-width: 1100px) {
    .flow-steps-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 600px) {
    .flow-steps-grid {
        grid-template-columns: 1fr;
    }
}

.flow-card {
    background-color: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 0.85rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
}

.flow-card .step-num {
    position: absolute;
    top: -10px;
    left: 10px;
    width: 22px;
    height: 22px;
    background-color: var(--secondary);
    color: #ffffff;
    border-radius: 50%;
    font-size: 0.72rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
}

.flow-card .step-icon {
    font-size: 1.6rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.flow-card h4 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-heading);
    margin-bottom: 0.35rem;
}

.flow-card p {
    font-size: 0.73rem;
    color: var(--text-muted);
    line-height: 1.35;
}

.flow-card.active-step {
    border-color: var(--primary);
    background-color: var(--primary-light);
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.flow-card.active-step .step-num {
    background-color: var(--primary);
}

.theory-equation-box {
    background-color: #0f172a;
    color: #ffffff;
    padding: 1.25rem;
    border-radius: var(--radius-md);
    text-align: center;
}

.theory-equation-box h4 {
    font-size: 0.9rem;
    color: var(--accent-cyan);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.equation-display {
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 700;
    color: #fef08a;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.eq-sub {
    font-size: 0.82rem;
    color: #94a3b8;
    font-weight: 400;
}

/* Comparison Table */
.comparison-table th.highlight-column,
.comparison-table td.highlight-column {
    background-color: #eff6ff;
    border-left: 2px solid var(--primary-border);
    border-right: 2px solid var(--primary-border);
}

.section-desc {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

/* Footer */
.app-footer {
    text-align: center;
    padding: 1rem;
    background-color: var(--bg-header);
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    margin-top: auto;
}

/* ================= RESPONSIVE MEDIA QUERIES ================= */

/* Tablet */
@media screen and (max-width: 1024px) {
    .main-container {
        padding: 0 1rem;
        margin: 1rem auto;
        gap: 1rem;
    }
    .header-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    .status-header-pills {
        flex-wrap: wrap;
    }
    .controls-readings-row {
        grid-template-columns: 1fr;
    }
    .button-group-primary {
        grid-template-columns: 1fr 1fr;
    }
}

/* Mobile Portrait */
@media screen and (max-width: 767px) and (orientation: portrait) {
    .main-container {
        padding: 0 0.5rem;
        margin: 0.5rem auto;
        gap: 0.75rem;
    }
    .controls-readings-row {
        display: flex;
        flex-direction: column;
    }
    .button-group-primary {
        grid-template-columns: 1fr;
    }
    .svg-container svg {
        width: 100%;
        height: auto;
        max-height: 50vh;
    }
    /* Touch-friendly targets */
    .btn, button, select, input[type="range"] {
        min-height: 44px;
        font-size: 16px !important;
    }
    .tab-btn {
        min-height: 44px;
        padding: 10px 14px;
    }
    .app-header {
        padding: 0.6rem 0.75rem;
    }
    .brand-name {
        font-size: 1.1rem;
    }
    .exp-info h2 {
        font-size: 0.95rem;
    }
    .status-pill {
        min-width: 70px;
    }
}

/* Mobile Landscape */
@media screen and (max-width: 950px) and (orientation: landscape) {
    .controls-readings-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
    }
    .main-container {
        padding: 0 0.5rem;
        margin: 0.5rem auto;
        gap: 0.75rem;
    }
}

/* ==========================================================================
   THEME COMPATIBILITY: LIGHT & DARK MODES FOR THERMOCOUPLE SIMULATOR
   ========================================================================== */

/* Prevent any background grids */
html, body, .svg-container, #apparatus-svg {
    background-image: none !important;
}

/* --------------------------------------------------------------------------
   HIGH PRIORITY SVG DISPLAY VALUES (Prevent theme.css from making them black)
   -------------------------------------------------------------------------- */
#svg-digital-temp-text,
.digital-temp-val {
    fill: #38bdf8 !important;
    font-weight: 700 !important;
}

#svg-digital-temp-f,
.digital-temp-f {
    fill: #0ea5e9 !important;
    font-weight: 600 !important;
}

.digital-screen-pv {
    fill: #94a3b8 !important;
    font-weight: 700 !important;
}

.digital-screen-sub {
    fill: #94a3b8 !important;
}

.temp-indicator-title {
    fill: #e2e8f0 !important;
    font-weight: 700 !important;
}

#svg-mv-digital-text,
.meter-digital-mv-val {
    fill: #22c55e !important;
    font-weight: 700 !important;
}

#svg-plate-temp-text {
    fill: #38bdf8 !important;
    font-weight: 600 !important;
}

.cold-junc-title {
    fill: #ffffff !important;
    font-weight: 700 !important;
}

.cold-junc-sub {
    fill: #38bdf8 !important;
    font-weight: 600 !important;
}

.cold-junc-terminal-sym {
    fill: #ffffff !important;
    font-weight: 800 !important;
}

.meter-title-text {
    fill: #ffffff !important;
    font-weight: 700 !important;
}

/* --------------------------------------------------------------------------
   LIGHT THEME OVERRIDES (html[data-theme="light"], html.light)
   -------------------------------------------------------------------------- */
html[data-theme="light"],
html.light,
html:not([data-theme="dark"]) {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --border-color: #e2e8f0;
    --text-main: #1e293b;
    --text-heading: #0f172a;
    --text-muted: #64748b;
}

html[data-theme="light"] body,
html.light body,
html:not([data-theme="dark"]) body {
    background-color: #f8fafc !important;
    color: #1e293b !important;
}

/* SVG in Light Mode */
html[data-theme="light"] .svg-backdrop,
html.light .svg-backdrop,
html:not([data-theme="dark"]) .svg-backdrop {
    fill: #ffffff !important;
}

html[data-theme="light"] .lab-bench-surface,
html.light .lab-bench-surface,
html:not([data-theme="dark"]) .lab-bench-surface {
    fill: #f1f5f9 !important;
    stroke: #cbd5e1 !important;
}

html[data-theme="light"] .lab-bench-top,
html.light .lab-bench-top,
html:not([data-theme="dark"]) .lab-bench-top {
    fill: #e2e8f0 !important;
}

html[data-theme="light"] .lab-bench-trim,
html.light .lab-bench-trim,
html:not([data-theme="dark"]) .lab-bench-trim {
    stroke: #cbd5e1 !important;
}

html[data-theme="light"] .inst-label-badge,
html.light .inst-label-badge,
html:not([data-theme="dark"]) .inst-label-badge {
    fill: #ffffff !important;
    stroke: #cbd5e1 !important;
}

html[data-theme="light"] #probe-ext-text,
html.light #probe-ext-text,
html:not([data-theme="dark"]) #probe-ext-text {
    fill: #0f172a !important;
    font-weight: 700 !important;
}

html[data-theme="light"] .cold-junc-box,
html.light .cold-junc-box,
html:not([data-theme="dark"]) .cold-junc-box {
    fill: #ffffff !important;
    stroke: #cbd5e1 !important;
}

html[data-theme="light"] .cold-junc-header,
html.light .cold-junc-header,
html:not([data-theme="dark"]) .cold-junc-header {
    fill: #1e293b !important;
}

html[data-theme="light"] .cold-junc-chamber,
html.light .cold-junc-chamber,
html:not([data-theme="dark"]) .cold-junc-chamber {
    fill: #e0f2fe !important;
    stroke: #38bdf8 !important;
}

html[data-theme="light"] .cold-junc-temp-text,
html.light .cold-junc-temp-text,
html:not([data-theme="dark"]) .cold-junc-temp-text {
    fill: #0284c7 !important;
    font-weight: 700 !important;
}

html[data-theme="light"] .temp-indicator-casing,
html.light .temp-indicator-casing,
html:not([data-theme="dark"]) .temp-indicator-casing {
    fill: #1e293b !important;
    stroke: #0f172a !important;
}

html[data-theme="light"] .temp-indicator-header,
html.light .temp-indicator-header,
html:not([data-theme="dark"]) .temp-indicator-header {
    fill: #0f172a !important;
}

html[data-theme="light"] .digital-screen-bg,
html.light .digital-screen-bg,
html:not([data-theme="dark"]) .digital-screen-bg {
    fill: #020617 !important;
    stroke: #334155 !important;
}

html[data-theme="light"] .meter-outer-casing,
html.light .meter-outer-casing,
html:not([data-theme="dark"]) .meter-outer-casing {
    fill: #ffffff !important;
    stroke: #cbd5e1 !important;
}

html[data-theme="light"] .meter-top-bar,
html.light .meter-top-bar,
html:not([data-theme="dark"]) .meter-top-bar {
    fill: #1e293b !important;
}

html[data-theme="light"] .meter-dial-face,
html.light .meter-dial-face,
html:not([data-theme="dark"]) .meter-dial-face {
    fill: #f8fafc !important;
    stroke: #cbd5e1 !important;
}

html[data-theme="light"] .meter-dial-arc,
html.light .meter-dial-arc,
html:not([data-theme="dark"]) .meter-dial-arc {
    stroke: #334155 !important;
}

html[data-theme="light"] #meter-ticks line,
html.light #meter-ticks line,
html:not([data-theme="dark"]) #meter-ticks line {
    stroke: #0f172a !important;
}

html[data-theme="light"] #meter-ticks text,
html.light #meter-ticks text,
html:not([data-theme="dark"]) #meter-ticks text {
    fill: #0f172a !important;
    font-weight: 600 !important;
}

html[data-theme="light"] .meter-unit-label,
html.light .meter-unit-label,
html:not([data-theme="dark"]) .meter-unit-label {
    fill: #64748b !important;
}

html[data-theme="light"] .meter-digital-screen-bg,
html.light .meter-digital-screen-bg,
html:not([data-theme="dark"]) .meter-digital-screen-bg {
    fill: #0f172a !important;
    stroke: #334155 !important;
}

/* UI Cards & Controls in Light Mode */
html[data-theme="light"] .card,
html.light .card,
html:not([data-theme="dark"]) .card {
    background-color: #ffffff !important;
    border-color: #e2e8f0 !important;
    color: #1e293b !important;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03) !important;
}

html[data-theme="light"] .card-header,
html.light .card-header,
html:not([data-theme="dark"]) .card-header {
    border-bottom-color: #e2e8f0 !important;
}

html[data-theme="light"] .card-header h2,
html.light .card-header h2,
html:not([data-theme="dark"]) .card-header h2 {
    color: #0f172a !important;
}

html[data-theme="light"] .tc-type-btn,
html.light .tc-type-btn,
html:not([data-theme="dark"]) .tc-type-btn {
    background-color: #f8fafc !important;
    border-color: #cbd5e1 !important;
    color: #1e293b !important;
}

html[data-theme="light"] .tc-type-btn:hover,
html.light .tc-type-btn:hover,
html:not([data-theme="dark"]) .tc-type-btn:hover {
    border-color: #2563eb !important;
    background-color: #eff6ff !important;
}

html[data-theme="light"] .tc-type-btn.active,
html.light .tc-type-btn.active,
html:not([data-theme="dark"]) .tc-type-btn.active {
    background-color: #eff6ff !important;
    border-color: #2563eb !important;
}

html[data-theme="light"] .tc-type-btn .tc-name,
html.light .tc-type-btn .tc-name,
html:not([data-theme="dark"]) .tc-type-btn .tc-name {
    color: #0f172a !important;
}

html[data-theme="light"] .segmented-control,
html.light .segmented-control,
html:not([data-theme="dark"]) .segmented-control {
    background-color: #f1f5f9 !important;
    border-color: #cbd5e1 !important;
}

html[data-theme="light"] .segment-btn,
html.light .segment-btn,
html:not([data-theme="dark"]) .segment-btn {
    color: #64748b !important;
}

html[data-theme="light"] .segment-btn.active,
html.light .segment-btn.active,
html:not([data-theme="dark"]) .segment-btn.active {
    background-color: #ffffff !important;
    color: #2563eb !important;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1) !important;
}

html[data-theme="light"] .reading-box,
html.light .reading-box,
html:not([data-theme="dark"]) .reading-box {
    background-color: #f8fafc !important;
    border-color: #e2e8f0 !important;
}

html[data-theme="light"] .reading-box .reading-label,
html.light .reading-box .reading-label,
html:not([data-theme="dark"]) .reading-box .reading-label {
    color: #64748b !important;
}

html[data-theme="light"] .reading-box .reading-value,
html.light .reading-box .reading-value,
html:not([data-theme="dark"]) .reading-box .reading-value {
    color: #0f172a !important;
}

html[data-theme="light"] .reading-box.highlight-box,
html.light .reading-box.highlight-box,
html:not([data-theme="dark"]) .reading-box.highlight-box {
    background-color: #eff6ff !important;
    border-color: #93c5fd !important;
}

html[data-theme="light"] .reading-box.highlight-box .reading-value,
html.light .reading-box.highlight-box .reading-value,
html:not([data-theme="dark"]) .reading-box.highlight-box .reading-value {
    color: #1d4ed8 !important;
}

html[data-theme="light"] .reading-box.highlight-box-voltage,
html.light .reading-box.highlight-box-voltage,
html:not([data-theme="dark"]) .reading-box.highlight-box-voltage {
    background-color: #f0fdf4 !important;
    border-color: #86efac !important;
}

html[data-theme="light"] .reading-box.highlight-box-voltage .reading-value,
html.light .reading-box.highlight-box-voltage .reading-value,
html:not([data-theme="dark"]) .reading-box.highlight-box-voltage .reading-value {
    color: #15803d !important;
}

html[data-theme="light"] .tc-info-panel,
html.light .tc-info-panel,
html:not([data-theme="dark"]) .tc-info-panel {
    background-color: #f8fafc !important;
    border-color: #e2e8f0 !important;
}

html[data-theme="light"] .info-title,
html.light .info-title,
html:not([data-theme="dark"]) .info-title {
    color: #64748b !important;
}

html[data-theme="light"] .info-detail,
html.light .info-detail,
html:not([data-theme="dark"]) .info-detail {
    color: #0f172a !important;
}

html[data-theme="light"] .tabs-header,
html.light .tabs-header,
html:not([data-theme="dark"]) .tabs-header {
    background-color: #f8fafc !important;
    border-bottom-color: #e2e8f0 !important;
}

html[data-theme="light"] .tab-btn,
html.light .tab-btn,
html:not([data-theme="dark"]) .tab-btn {
    color: #64748b !important;
}

html[data-theme="light"] .tab-btn.active,
html.light .tab-btn.active,
html:not([data-theme="dark"]) .tab-btn.active {
    color: #2563eb !important;
    border-bottom-color: #2563eb !important;
    background-color: transparent !important;
}

html[data-theme="light"] .data-table,
html.light .data-table,
html:not([data-theme="dark"]) .data-table {
    border-color: #e2e8f0 !important;
}

html[data-theme="light"] .data-table th,
html.light .data-table th,
html:not([data-theme="dark"]) .data-table th {
    background-color: #f1f5f9 !important;
    color: #334155 !important;
    border-color: #e2e8f0 !important;
}

html[data-theme="light"] .data-table td,
html.light .data-table td,
html:not([data-theme="dark"]) .data-table td {
    color: #1e293b !important;
    border-color: #e2e8f0 !important;
}

html[data-theme="light"] .data-table tbody tr:hover,
html.light .data-table tbody tr:hover,
html:not([data-theme="dark"]) .data-table tbody tr:hover {
    background-color: #f8fafc !important;
}

html[data-theme="light"] .flow-card,
html.light .flow-card,
html:not([data-theme="dark"]) .flow-card {
    background-color: #f8fafc !important;
    border-color: #e2e8f0 !important;
    color: #1e293b !important;
}

html[data-theme="light"] .flow-card h4,
html.light .flow-card h4,
html:not([data-theme="dark"]) .flow-card h4 {
    color: #0f172a !important;
}

html[data-theme="light"] .flow-card p,
html.light .flow-card p,
html:not([data-theme="dark"]) .flow-card p {
    color: #64748b !important;
}

html[data-theme="light"] .flow-card.active-step,
html.light .flow-card.active-step,
html:not([data-theme="dark"]) .flow-card.active-step {
    border-color: #2563eb !important;
    background-color: #eff6ff !important;
}

html[data-theme="light"] .theory-equation-box,
html.light .theory-equation-box,
html:not([data-theme="dark"]) .theory-equation-box {
    background-color: #f8fafc !important;
    border-color: #e2e8f0 !important;
}

/* --------------------------------------------------------------------------
   DARK THEME OVERRIDES (html[data-theme="dark"], html.dark)
   -------------------------------------------------------------------------- */
html[data-theme="dark"],
html.dark {
    --bg-main: #0b0f19;
    --bg-card: #111827;
    --border-color: #1f2937;
    --text-main: #cbd5e1;
    --text-heading: #f8fafc;
    --text-muted: #94a3b8;
}

html[data-theme="dark"] body,
html.dark body {
    background-color: #0b0f19 !important;
    color: #cbd5e1 !important;
}

/* SVG in Dark Mode */
html[data-theme="dark"] .svg-backdrop,
html.dark .svg-backdrop {
    fill: #0b0f19 !important;
}

html[data-theme="dark"] .lab-bench-surface,
html.dark .lab-bench-surface {
    fill: #131b2e !important;
    stroke: #1e293b !important;
}

html[data-theme="dark"] .lab-bench-top,
html.dark .lab-bench-top {
    fill: #0f172a !important;
}

html[data-theme="dark"] .lab-bench-trim,
html.dark .lab-bench-trim {
    stroke: #334155 !important;
}

html[data-theme="dark"] .inst-label-badge,
html.dark .inst-label-badge {
    fill: #1e293b !important;
    stroke: #334155 !important;
}

html[data-theme="dark"] #probe-ext-text,
html.dark #probe-ext-text {
    fill: #f1f5f9 !important;
    font-weight: 700 !important;
}

html[data-theme="dark"] .cold-junc-box,
html.dark .cold-junc-box {
    fill: #1e293b !important;
    stroke: #334155 !important;
}

html[data-theme="dark"] .cold-junc-header,
html.dark .cold-junc-header {
    fill: #0f172a !important;
}

html[data-theme="dark"] .cold-junc-chamber,
html.dark .cold-junc-chamber {
    fill: #082f49 !important;
    stroke: #0284c7 !important;
}

html[data-theme="dark"] .cold-junc-temp-text,
html.dark .cold-junc-temp-text {
    fill: #38bdf8 !important;
    font-weight: 700 !important;
}

html[data-theme="dark"] .temp-indicator-casing,
html.dark .temp-indicator-casing {
    fill: #1e293b !important;
    stroke: #334155 !important;
}

html[data-theme="dark"] .temp-indicator-header,
html.dark .temp-indicator-header {
    fill: #0f172a !important;
}

html[data-theme="dark"] .digital-screen-bg,
html.dark .digital-screen-bg {
    fill: #020617 !important;
    stroke: #1e293b !important;
}

html[data-theme="dark"] .meter-outer-casing,
html.dark .meter-outer-casing {
    fill: #1e293b !important;
    stroke: #334155 !important;
}

html[data-theme="dark"] .meter-top-bar,
html.dark .meter-top-bar {
    fill: #0f172a !important;
}

html[data-theme="dark"] .meter-dial-face,
html.dark .meter-dial-face {
    fill: #0f172a !important;
    stroke: #334155 !important;
}

html[data-theme="dark"] .meter-dial-arc,
html.dark .meter-dial-arc {
    stroke: #475569 !important;
}

html[data-theme="dark"] #meter-ticks line,
html.dark #meter-ticks line {
    stroke: #94a3b8 !important;
}

html[data-theme="dark"] #meter-ticks text,
html.dark #meter-ticks text {
    fill: #cbd5e1 !important;
    font-weight: 600 !important;
}

html[data-theme="dark"] .meter-unit-label,
html.dark .meter-unit-label {
    fill: #94a3b8 !important;
}

html[data-theme="dark"] .meter-digital-screen-bg,
html.dark .meter-digital-screen-bg {
    fill: #020617 !important;
    stroke: #334155 !important;
}

html[data-theme="dark"] .svg-label,
html.dark .svg-label {
    fill: #94a3b8 !important;
}

html[data-theme="dark"] .svg-label-bold,
html.dark .svg-label-bold {
    fill: #e2e8f0 !important;
}

/* UI Cards & Controls in Dark Mode */
html[data-theme="dark"] .card,
html.dark .card {
    background-color: #111827 !important;
    border-color: #1f2937 !important;
    color: #cbd5e1 !important;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3) !important;
}

html[data-theme="dark"] .card-header,
html.dark .card-header {
    border-bottom-color: #1f2937 !important;
}

html[data-theme="dark"] .card-header h2,
html.dark .card-header h2 {
    color: #f8fafc !important;
}

html[data-theme="dark"] .tc-type-btn,
html.dark .tc-type-btn {
    background-color: #1e293b !important;
    border-color: #334155 !important;
    color: #cbd5e1 !important;
}

html[data-theme="dark"] .tc-type-btn:hover,
html.dark .tc-type-btn:hover {
    border-color: #3b82f6 !important;
    background-color: #1e3a5f !important;
}

html[data-theme="dark"] .tc-type-btn.active,
html.dark .tc-type-btn.active {
    background-color: #1e3a8a !important;
    border-color: #60a5fa !important;
}

html[data-theme="dark"] .tc-type-btn .tc-name,
html.dark .tc-type-btn .tc-name {
    color: #f8fafc !important;
}

html[data-theme="dark"] .segmented-control,
html.dark .segmented-control {
    background-color: #0f172a !important;
    border-color: #334155 !important;
}

html[data-theme="dark"] .segment-btn,
html.dark .segment-btn {
    color: #94a3b8 !important;
}

html[data-theme="dark"] .segment-btn.active,
html.dark .segment-btn.active {
    background-color: #2563eb !important;
    color: #ffffff !important;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4) !important;
}

html[data-theme="dark"] .reading-box,
html.dark .reading-box {
    background-color: #0f172a !important;
    border-color: #1e293b !important;
}

html[data-theme="dark"] .reading-box .reading-label,
html.dark .reading-box .reading-label {
    color: #94a3b8 !important;
}

html[data-theme="dark"] .reading-box .reading-value,
html.dark .reading-box .reading-value {
    color: #f8fafc !important;
}

html[data-theme="dark"] .reading-box.highlight-box,
html.dark .reading-box.highlight-box {
    background-color: rgba(37, 99, 235, 0.15) !important;
    border-color: rgba(37, 99, 235, 0.4) !important;
}

html[data-theme="dark"] .reading-box.highlight-box .reading-value,
html.dark .reading-box.highlight-box .reading-value {
    color: #60a5fa !important;
}

html[data-theme="dark"] .reading-box.highlight-box-voltage,
html.dark .reading-box.highlight-box-voltage {
    background-color: rgba(34, 197, 94, 0.15) !important;
    border-color: rgba(34, 197, 94, 0.4) !important;
}

html[data-theme="dark"] .reading-box.highlight-box-voltage .reading-value,
html.dark .reading-box.highlight-box-voltage .reading-value {
    color: #4ade80 !important;
}

html[data-theme="dark"] .tc-info-panel,
html.dark .tc-info-panel {
    background-color: #0f172a !important;
    border-color: #1e293b !important;
}

html[data-theme="dark"] .info-title,
html.dark .info-title {
    color: #94a3b8 !important;
}

html[data-theme="dark"] .info-detail,
html.dark .info-detail {
    color: #f1f5f9 !important;
}

html[data-theme="dark"] .tabs-header,
html.dark .tabs-header {
    background-color: #0f172a !important;
    border-bottom-color: #1f2937 !important;
}

html[data-theme="dark"] .tab-btn,
html.dark .tab-btn {
    color: #94a3b8 !important;
}

html[data-theme="dark"] .tab-btn.active,
html.dark .tab-btn.active {
    color: #60a5fa !important;
    border-bottom-color: #60a5fa !important;
    background-color: transparent !important;
}

html[data-theme="dark"] .data-table,
html.dark .data-table {
    border-color: #1f2937 !important;
}

html[data-theme="dark"] .data-table th,
html.dark .data-table th {
    background-color: #0f172a !important;
    color: #e2e8f0 !important;
    border-color: #1f2937 !important;
}

html[data-theme="dark"] .data-table td,
html.dark .data-table td {
    color: #cbd5e1 !important;
    border-color: #1f2937 !important;
}

html[data-theme="dark"] .data-table tbody tr:hover,
html.dark .data-table tbody tr:hover {
    background-color: #1e293b !important;
}

html[data-theme="dark"] .flow-card,
html.dark .flow-card {
    background-color: #0f172a !important;
    border-color: #1e293b !important;
    color: #cbd5e1 !important;
}

html[data-theme="dark"] .flow-card h4,
html.dark .flow-card h4 {
    color: #f8fafc !important;
}

html[data-theme="dark"] .flow-card p,
html.dark .flow-card p {
    color: #94a3b8 !important;
}

html[data-theme="dark"] .flow-card.active-step,
html.dark .flow-card.active-step {
    border-color: #3b82f6 !important;
    background-color: rgba(59, 130, 246, 0.12) !important;
}

html[data-theme="dark"] .theory-equation-box,
html.dark .theory-equation-box {
    background-color: #0f172a !important;
    border-color: #1e293b !important;
}

html[data-theme="dark"] .chart-header h3,
html.dark .chart-header h3,
html[data-theme="dark"] .theory-intro h3,
html.dark .theory-intro h3 {
    color: #f8fafc !important;
}

html[data-theme="dark"] .theory-intro p,
html.dark .theory-intro p {
    color: #cbd5e1 !important;
}

html[data-theme="dark"] .btn-outline,
html.dark .btn-outline {
    background-color: #1e293b !important;
    border-color: #334155 !important;
    color: #f8fafc !important;
}

html[data-theme="dark"] .btn-outline:hover,
html.dark .btn-outline:hover {
    background-color: #334155 !important;
    border-color: #475569 !important;
}