/* ==========================================================================
   Virtual Instrumentation Labs - Virtual Instrumentation Laboratory Design System
   Experiment: Differential Pressure (DP) Level Transmitter
   Aesthetic: Clean Engineering Laboratory (Dark Blue, Steel Slate & Medical Teal accents)
   ========================================================================== */

/* --- CSS Variables & Design Tokens --- */
:root {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-header: #0f172a;
    --bg-header-sub: #1e293b;
    --border-card: #e2e8f0;
    --border-focus: #0284c7;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-light: #f8fafc;

    --accent-blue: #0284c7;
    --accent-blue-hover: #0369a1;
    --accent-blue-light: #e0f2fe;
    
    --accent-emerald: #059669;
    --accent-emerald-hover: #047857;
    --accent-emerald-light: #d1fae5;

    --accent-purple: #7c3aed;
    --accent-purple-light: #f3e8ff;

    --accent-danger: #dc2626;
    --accent-danger-hover: #b91c1c;

    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    padding-bottom: 40px;
}

/* --- Header Layout --- */
.app-header {
    background: linear-gradient(135deg, var(--bg-header) 0%, var(--bg-header-sub) 100%);
    color: var(--text-light);
    padding: 16px 28px;
    box-shadow: var(--shadow-md);
    border-bottom: 3px solid var(--accent-blue);
}

.header-container {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.brand-title {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.brand-logo {
    font-size: 1.2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: #38bdf8;
}

.lab-badge {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: #94a3b8;
}

.experiment-info h1 {
    font-size: 1.35rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 2px;
}

.experiment-info .subtitle {
    font-size: 0.85rem;
    color: #cbd5e1;
}

.header-status {
    display: flex;
    align-items: center;
    gap: 16px;
    background: rgba(255, 255, 255, 0.06);
    padding: 8px 16px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: #22c55e;
    box-shadow: 0 0 8px #22c55e;
    animation: pulseGlow 2s infinite;
}

@keyframes pulseGlow {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.7; }
}

.loop-status-badge {
    font-size: 0.85rem;
    color: #cbd5e1;
    border-left: 1px solid rgba(255, 255, 255, 0.2);
    padding-left: 12px;
}

.loop-status-badge strong {
    font-family: var(--font-mono);
    color: #34d399;
    font-size: 0.95rem;
}

/* --- Main Layout Grid --- */
.lab-workspace {
    max-width: 1600px;
    margin: 24px auto 0 auto;
    padding: 0 24px;
}

.workspace-grid {
    display: grid;
    grid-template-columns: 1.35fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

@media (max-width: 1100px) {
    .workspace-grid {
        grid-template-columns: 1fr;
    }
}

/* --- Standard Card Components --- */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 20px;
    transition: box-shadow 0.2s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 14px;
    margin-bottom: 16px;
    border-bottom: 2px solid var(--bg-main);
}

.panel-header h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.panel-header .icon {
    font-size: 1.2rem;
}

.view-mode-badge, .mode-badge {
    font-size: 0.75rem;
    font-weight: 600;
    background-color: var(--accent-blue-light);
    color: var(--accent-blue-hover);
    padding: 4px 10px;
    border-radius: 20px;
}

/* --- Left Panel: SVG Engineering Viewport --- */
.panel-setup {
    display: flex;
    flex-direction: column;
}

.svg-viewport {
    background: radial-gradient(circle at center, #ffffff 0%, #f1f5f9 100%);
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 12px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 480px;
}

.svg-viewport svg {
    width: 100%;
    height: auto;
    max-height: 560px;
}

.interactive-valve {
    cursor: pointer;
    transition: transform 0.2s ease, fill 0.2s ease;
    transform-box: fill-box;
    transform-origin: center;
}

.interactive-valve:hover {
    transform: scale(1.18);
    filter: drop-shadow(0 0 4px rgba(0,0,0,0.25));
}

/* Pipe & Signal Line Flow Animations */
@keyframes flowDash {
    to {
        stroke-dashoffset: -28;
    }
}

.pulse-hp-line {
    animation: flowDash 1s linear infinite;
}

.pulse-gas-line {
    animation: flowDash 2s linear infinite;
}

.wire-signal-plus {
    stroke-dasharray: 8, 4;
    animation: flowDash 1.2s linear infinite;
}

.wire-signal-loop {
    stroke-dasharray: 8, 4;
    animation: flowDash 1.5s linear infinite;
}

/* Splash Ripple Animation when Filling */
@keyframes rippleExpand {
    0% { transform: scale(0.6); opacity: 0.9; }
    50% { opacity: 0.6; }
    100% { transform: scale(1.4); opacity: 0; }
}

#svg-splash-group.active #splash-ellipse-1 {
    transform-box: fill-box;
    transform-origin: center;
    animation: rippleExpand 0.8s infinite ease-out;
}

#svg-splash-group.active #splash-ellipse-2 {
    transform-box: fill-box;
    transform-origin: center;
    animation: rippleExpand 0.8s 0.3s infinite ease-out;
}

/* --- Right Panel: Experiment Controls --- */
.panel-controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.controls-action-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.btn {
    font-family: var(--font-main);
    font-size: 0.9rem;
    font-weight: 600;
    padding: 11px 18px;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background-color: var(--accent-blue);
    color: #ffffff;
}

.btn-primary:hover {
    background-color: var(--accent-blue-hover);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: #e2e8f0;
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: #cbd5e1;
}

.btn-action {
    background-color: #0284c7;
    color: #ffffff;
}

.btn-action:hover {
    background-color: #0369a1;
}

.btn-action-drain {
    background-color: #e0f2fe;
    color: #0369a1;
    border: 1px solid #bae6fd;
}

.btn-action-drain:hover {
    background-color: #bae6fd;
}

.btn-danger {
    background-color: #fee2e2;
    color: var(--accent-danger);
}

.btn-danger:hover {
    background-color: #fca5a5;
}

.btn-sm {
    font-size: 0.8rem;
    padding: 6px 12px;
}

/* View Toggle Card */
.view-toggle-card {
    background-color: #f0f9ff;
    border: 1.5px stroke #bae6fd;
    border-radius: var(--radius-md);
    padding: 14px 18px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.toggle-info strong {
    font-size: 0.9rem;
    color: var(--text-primary);
    display: block;
}

.toggle-info p {
    font-size: 0.78rem;
    color: var(--text-muted);
}

.btn-toggle-view {
    background-color: #0f172a;
    color: #38bdf8;
    border: 1px solid #0284c7;
}

.btn-toggle-view:hover {
    background-color: #1e293b;
    box-shadow: 0 0 10px rgba(2, 132, 199, 0.3);
}

/* Tank Slider Control */
.slider-control-card {
    background-color: #f8fafc;
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 16px;
}

.slider-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

.slider-label-row label {
    font-size: 0.9rem;
    color: var(--text-primary);
}

.slider-val-display {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--accent-blue);
}

.custom-slider {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: #cbd5e1;
    outline: none;
    -webkit-appearance: none;
    margin-bottom: 12px;
}

.custom-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent-blue);
    cursor: pointer;
    border: 3px solid #ffffff;
    box-shadow: var(--shadow-md);
    transition: transform 0.15s ease;
}

.custom-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.slider-quick-buttons {
    display: flex;
    gap: 8px;
    justify-content: space-between;
}

.btn-step {
    flex: 1;
    background-color: #ffffff;
    border: 1px solid #cbd5e1;
    border-radius: var(--radius-sm);
    padding: 5px 0;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
}

.btn-step:hover {
    background-color: var(--accent-blue-light);
    color: var(--accent-blue);
    border-color: var(--accent-blue);
}

/* Digital Readouts Section */
.readouts-section-title {
    font-size: 0.82rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--text-muted);
    margin-top: 4px;
}

.readouts-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.readout-card {
    border-radius: var(--radius-md);
    padding: 14px 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    border: 1px solid var(--border-card);
}

.card-blue {
    background-color: #f0f9ff;
    border-color: #bae6fd;
}

.card-purple {
    background-color: #f5f3ff;
    border-color: #ddd6fe;
}

.card-emerald {
    background-color: #ecfdf5;
    border-color: #a7f3d0;
}

.readout-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.readout-value {
    font-family: var(--font-mono);
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-primary);
}

.readout-value .unit {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
}

.readout-sub {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Working Signal Flow Tracker */
.signal-flow-tracker {
    background-color: #f8fafc;
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 14px;
}

.tracker-header {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 10px;
}

.flow-steps {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4px;
}

.flow-step {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 6px 4px;
    background-color: #ffffff;
    border: 1px solid #e2e8f0;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.flow-step.active {
    background-color: var(--accent-blue-light);
    border-color: var(--accent-blue);
}

.step-num {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background-color: #cbd5e1;
    color: #ffffff;
    font-size: 0.65rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 3px;
}

.flow-step.active .step-num {
    background-color: var(--accent-blue);
}

.step-text {
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.flow-arrow {
    font-size: 0.75rem;
    color: #cbd5e1;
}

/* --- Bottom Panel: Observation & Analytics --- */
.panel-observation {
    padding: 0;
    overflow: hidden;
}

.tab-navigation {
    display: flex;
    background-color: #f1f5f9;
    border-bottom: 1px solid var(--border-card);
    overflow-x: auto;
}

.tab-btn {
    font-family: var(--font-main);
    font-size: 0.88rem;
    font-weight: 600;
    padding: 14px 24px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    color: var(--text-muted);
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.5);
}

.tab-btn.active {
    color: var(--accent-blue);
    background-color: var(--bg-card);
    border-bottom-color: var(--accent-blue);
}

.tab-content {
    display: none;
    padding: 24px;
}

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

/* Observation Table Styles */
.table-actions {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

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

.obs-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    text-align: left;
}

.obs-table th {
    background-color: #f8fafc;
    color: var(--text-secondary);
    font-weight: 700;
    padding: 10px 14px;
    border-bottom: 2px solid var(--border-card);
}

.obs-table td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-card);
    color: var(--text-primary);
    font-family: var(--font-mono);
}

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

.obs-table tr:hover {
    background-color: var(--accent-blue-light);
}

/* Live Graphs Layout */
.graphs-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

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

.graph-card {
    background-color: #ffffff;
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 16px;
}

.graph-card h3 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.chart-container {
    position: relative;
    height: 280px;
    width: 100%;
}

/* Theory & Applications Layout */
.theory-grid, .applications-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

@media (max-width: 900px) {
    .theory-grid, .applications-grid {
        grid-template-columns: 1fr;
    }
}

.theory-card, .app-card {
    background-color: #f8fafc;
    border: 1px solid var(--border-card);
    border-radius: var(--radius-md);
    padding: 18px;
}

.theory-card h3, .app-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.formula-box {
    background-color: #0f172a;
    color: #38bdf8;
    font-family: var(--font-mono);
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    text-align: center;
    margin: 12px 0;
    font-size: 1rem;
}

.theory-card ul, .app-card ul {
    padding-left: 20px;
    margin-top: 8px;
}

.theory-card li, .app-card li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

/* Footer */
.app-footer {
    max-width: 1600px;
    margin: 24px auto 0 auto;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
}

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

/* Tablet */
@media screen and (max-width: 1024px) {
    .workspace-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    .bottom-section {
        grid-template-columns: 1fr;
    }
    .app-wrapper {
        padding: 0 12px;
        gap: 1rem;
    }
    .app-header-content {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Mobile Portrait */
@media screen and (max-width: 767px) and (orientation: portrait) {
    .workspace-grid {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }
    .bottom-section {
        display: flex;
        flex-direction: column;
    }
    .reading-grid {
        grid-template-columns: 1fr;
    }
    .action-buttons {
        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;
    }
    .app-wrapper {
        padding: 0 6px;
        gap: 8px;
    }
    .app-header {
        padding: 8px 12px;
    }
}

/* Mobile Landscape */
@media screen and (max-width: 950px) and (orientation: landscape) {
    .workspace-grid {
        display: grid;
        grid-template-columns: 1.2fr 0.8fr;
        gap: 10px;
    }
    .bottom-section {
        grid-template-columns: 1fr 1fr;
    }
    .app-wrapper {
        padding: 0 8px;
        gap: 8px;
    }
}

/* ==========================================================================
   DARK THEME STYLING & PROFESSIONAL LABORATORY PALETTE
   ========================================================================== */
html[data-theme="dark"],
html.dark {
    --bg-main: #080d18;
    --bg-card: #0f172a;
    --bg-header: #0b1329;
    --bg-header-sub: #060913;
    --border-card: #1e293b;
    --border-focus: #38bdf8;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-light: #f8fafc;
    --accent-blue: #38bdf8;
    --accent-blue-hover: #0284c7;
    --accent-blue-light: rgba(56, 189, 248, 0.15);
    color-scheme: dark;
}

html[data-theme="dark"] body,
html.dark body {
    background-color: var(--bg-main) !important;
    color: var(--text-primary) !important;
}

/* Card Containers in Dark Mode */
html[data-theme="dark"] .card,
html.dark .card {
    background-color: #0f172a !important;
    border-color: #1e293b !important;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3) !important;
}

html[data-theme="dark"] .panel-header,
html.dark .panel-header {
    border-bottom-color: #1e293b !important;
}

html[data-theme="dark"] .panel-header h2,
html.dark .panel-header h2 {
    color: #f1f5f9 !important;
}

/* SVG Viewport & Canvas in Dark Mode */
html[data-theme="dark"] .svg-viewport,
html.dark .svg-viewport {
    background: radial-gradient(circle at center, #0b1326 0%, #060a12 100%) !important;
    border-color: #1e293b !important;
    box-shadow: inset 0 0 35px rgba(0, 0, 0, 0.6) !important;
}

/* Technical Background Grid Lines */
html[data-theme="dark"] .svg-tech-grid line,
html.dark .svg-tech-grid line {
    stroke: rgba(255, 255, 255, 0.04) !important;
}

/* Tank Interior Sight Glass */
html[data-theme="dark"] .tank-sight-glass,
html.dark .tank-sight-glass {
    fill: #090e1a !important;
    stroke: #1e293b !important;
}

/* Tank Calibration Scale Markings & Text */
html[data-theme="dark"] .tank-scale-line,
html.dark .tank-scale-line {
    stroke: #64748b !important;
}

html[data-theme="dark"] .tank-scale-mark,
html.dark .tank-scale-mark {
    stroke: #94a3b8 !important;
}

html[data-theme="dark"] .tank-scale-text,
html.dark .tank-scale-text {
    fill: #cbd5e1 !important;
}

/* Flange and Manifold Labels */
html[data-theme="dark"] .flange-label,
html.dark .flange-label {
    fill: #94a3b8 !important;
}

html[data-theme="dark"] .manifold-label,
html.dark .manifold-label {
    fill: #cbd5e1 !important;
}

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

html[data-theme="dark"] .label-badge-text,
html.dark .label-badge-text {
    fill: #f8fafc !important;
}

html[data-theme="dark"] .label-badge-dark-box,
html.dark .label-badge-dark-box {
    fill: #141e33 !important;
    stroke: #334155 !important;
}

html[data-theme="dark"] .label-badge-dark-text,
html.dark .label-badge-dark-text {
    fill: #38bdf8 !important;
}

html[data-theme="dark"] .label-text-direct,
html.dark .label-text-direct {
    fill: #cbd5e1 !important;
}

/* Cutaway Internal View Shell */
html[data-theme="dark"] .tx-cutaway-shell,
html.dark .tx-cutaway-shell {
    fill: #0f172a !important;
    stroke: #38bdf8 !important;
    opacity: 0.95 !important;
}

/* View Toggle Card in Dark Mode */
html[data-theme="dark"] .view-toggle-card,
html.dark .view-toggle-card {
    background-color: #141e33 !important;
    border: 1px solid #1e293b !important;
}

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

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

html[data-theme="dark"] .btn-toggle-view,
html.dark .btn-toggle-view {
    background-color: #1e293b !important;
    color: #38bdf8 !important;
    border-color: #38bdf8 !important;
}

html[data-theme="dark"] .btn-toggle-view:hover,
html.dark .btn-toggle-view:hover {
    background-color: #25334d !important;
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.3) !important;
}

/* Slider Control Card in Dark Mode */
html[data-theme="dark"] .slider-control-card,
html.dark .slider-control-card {
    background-color: #141e33 !important;
    border-color: #1e293b !important;
}

html[data-theme="dark"] .slider-label-row label,
html.dark .slider-label-row label {
    color: #f8fafc !important;
}

html[data-theme="dark"] .slider-val-display,
html.dark .slider-val-display {
    color: #38bdf8 !important;
}

html[data-theme="dark"] .custom-slider,
html.dark .custom-slider {
    background: #1e293b !important;
}

html[data-theme="dark"] .custom-slider::-webkit-slider-thumb,
html.dark .custom-slider::-webkit-slider-thumb {
    background: #38bdf8 !important;
    border-color: #0f172a !important;
}

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

html[data-theme="dark"] .btn-step:hover,
html.dark .btn-step:hover {
    background-color: rgba(56, 189, 248, 0.15) !important;
    color: #38bdf8 !important;
    border-color: #38bdf8 !important;
}

/* Readout Cards in Dark Mode */
html[data-theme="dark"] .readout-card,
html.dark .readout-card {
    border-color: #1e293b !important;
}

html[data-theme="dark"] .card-blue,
html.dark .card-blue {
    background-color: rgba(56, 189, 248, 0.08) !important;
    border-color: rgba(56, 189, 248, 0.25) !important;
}

html[data-theme="dark"] .card-purple,
html.dark .card-purple {
    background-color: rgba(168, 85, 247, 0.08) !important;
    border-color: rgba(168, 85, 247, 0.25) !important;
}

html[data-theme="dark"] .card-emerald,
html.dark .card-emerald {
    background-color: rgba(16, 185, 129, 0.08) !important;
    border-color: rgba(16, 185, 129, 0.25) !important;
}

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

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

html[data-theme="dark"] .readout-sub,
html.dark .readout-sub {
    color: #64748b !important;
}

/* Signal Flow Tracker in Dark Mode */
html[data-theme="dark"] .signal-flow-tracker,
html.dark .signal-flow-tracker {
    background-color: #141e33 !important;
    border-color: #1e293b !important;
}

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

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

html[data-theme="dark"] .flow-step.active,
html.dark .flow-step.active {
    background-color: rgba(56, 189, 248, 0.15) !important;
    border-color: #38bdf8 !important;
}

html[data-theme="dark"] .step-num,
html.dark .step-num {
    background-color: #334155 !important;
    color: #f8fafc !important;
}

html[data-theme="dark"] .flow-step.active .step-num,
html.dark .flow-step.active .step-num {
    background-color: #38bdf8 !important;
    color: #0f172a !important;
}

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

html[data-theme="dark"] .flow-arrow,
html.dark .flow-arrow {
    color: #475569 !important;
}

/* Button & Badges Overrides in Dark Mode */
html[data-theme="dark"] .btn-secondary,
html.dark .btn-secondary {
    background-color: #1e293b !important;
    color: #f1f5f9 !important;
    border: 1px solid #334155 !important;
}

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

html[data-theme="dark"] .btn-action-drain,
html.dark .btn-action-drain {
    background-color: rgba(2, 132, 199, 0.2) !important;
    color: #38bdf8 !important;
    border: 1px solid #0284c7 !important;
}

html[data-theme="dark"] .btn-action-drain:hover,
html.dark .btn-action-drain:hover {
    background-color: rgba(2, 132, 199, 0.35) !important;
}

html[data-theme="dark"] .view-mode-badge,
html[data-theme="dark"] .mode-badge,
html.dark .view-mode-badge,
html.dark .mode-badge {
    background-color: rgba(56, 189, 248, 0.15) !important;
    color: #38bdf8 !important;
}

/* Bottom Panel: Tabs, Table, Graphs, Theory in Dark Mode */
html[data-theme="dark"] .panel-observation,
html.dark .panel-observation {
    background-color: #0f172a !important;
    border-color: #1e293b !important;
}

html[data-theme="dark"] .tab-navigation,
html.dark .tab-navigation {
    background-color: #090e1a !important;
    border-bottom-color: #1e293b !important;
}

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

html[data-theme="dark"] .tab-btn:hover,
html.dark .tab-btn:hover {
    color: #f1f5f9 !important;
    background-color: rgba(255, 255, 255, 0.04) !important;
}

html[data-theme="dark"] .tab-btn.active,
html.dark .tab-btn.active {
    color: #38bdf8 !important;
    background-color: #0f172a !important;
    border-bottom-color: #38bdf8 !important;
}

html[data-theme="dark"] .obs-table th,
html.dark .obs-table th {
    background-color: #131d31 !important;
    color: #93c5fd !important;
    border-bottom-color: #1e293b !important;
}

html[data-theme="dark"] .obs-table td,
html.dark .obs-table td {
    border-bottom-color: #1e293b !important;
    color: #cbd5e1 !important;
}

html[data-theme="dark"] .obs-table tr:nth-child(even),
html.dark .obs-table tr:nth-child(even) {
    background-color: #131d31 !important;
}

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

html[data-theme="dark"] .graph-card,
html.dark .graph-card {
    background-color: #141e33 !important;
    border-color: #1e293b !important;
}

html[data-theme="dark"] .graph-card h3,
html.dark .graph-card h3 {
    color: #f1f5f9 !important;
}

html[data-theme="dark"] .theory-card,
html[data-theme="dark"] .app-card,
html.dark .theory-card,
html.dark .app-card {
    background-color: #141e33 !important;
    border-color: #1e293b !important;
}

html[data-theme="dark"] .theory-card h3,
html[data-theme="dark"] .app-card h3,
html.dark .theory-card h3,
html.dark .app-card h3 {
    color: #38bdf8 !important;
}

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

html[data-theme="dark"] .formula-box,
html.dark .formula-box {
    background-color: #090e1a !important;
    border: 1px solid #1e293b !important;
    color: #38bdf8 !important;
}

html[data-theme="dark"] .app-footer,
html.dark .app-footer {
    color: #64748b !important;
}