/* ==========================================================================
   Virtual Instrumentation Labs - Electromagnetic Flow Transmitter Experiment CSS
   Modern University Instrumentation Laboratory Design System
   ========================================================================== */

:root {
    /* Color Palette */
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-subtle: #f1f5f9;
    --navy-900: #0f172a;
    --navy-800: #1e293b;
    --navy-700: #334155;
    --navy-600: #475569;
    --navy-500: #64748b;
    --navy-400: #94a3b8;
    --navy-100: #f1f5f9;
    
    /* Brand & Accent Colors */
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --success: #10b981;
    --success-hover: #059669;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --warning: #f59e0b;
    --indigo: #6366f1;

    /* Borders & Shadows */
    --border-color: #e2e8f0;
    --border-dark: #cbd5e1;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
    --shadow-lg: 0 10px 25px rgba(15, 23, 42, 0.12);

    /* Fonts */
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-main);
    color: var(--navy-900);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* ==========================================================================
   APP HEADER
   ========================================================================== */
.app-header {
    background-color: var(--navy-900);
    color: #ffffff;
    padding: 0.85rem 1.5rem;
    border-bottom: 3px solid var(--primary);
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

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

.brand-logo {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary), #3b82f6);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    box-shadow: 0 0 12px rgba(37, 99, 235, 0.4);
}

.brand-text h1 {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: #ffffff;
    line-height: 1.1;
}

.brand-text .sub-title {
    font-size: 0.75rem;
    color: var(--navy-400);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.experiment-title-badge {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: rgba(255, 255, 255, 0.07);
    padding: 0.4rem 1rem;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.12);
}

.exp-code {
    background-color: var(--primary);
    color: #ffffff;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.experiment-title-badge h2 {
    font-size: 1.05rem;
    font-weight: 600;
    color: #f8fafc;
}

/* Status Indicator Pill */
.status-indicator-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background-color: rgba(16, 185, 129, 0.15);
    color: #34d399;
    border: 1px solid rgba(16, 185, 129, 0.3);
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--success);
    animation: pulse-dot 1.8s infinite;
}

@keyframes pulse-dot {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.3); opacity: 0.6; }
}

/* ==========================================================================
   Virtual Instrumentation Labs - Electromagnetic Flow Transmitter Experiment CSS
   ========================================================================== */
.workspace-grid {
    max-width: 1600px;
    margin: 1.25rem auto;
    padding: 0 1.25rem;
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 1.25rem;
    width: 100%;
}

@media (max-width: 1200px) {
    .workspace-grid {
        grid-template-columns: 1fr;
    }
}

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

.card-header {
    background-color: #ffffff;
    padding: 0.9rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.card-header.space-between {
    justify-content: space-between;
}

.card-title {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    color: var(--navy-900);
}

.card-title h3 {
    font-size: 1.05rem;
    font-weight: 700;
}

.subtitle {
    font-size: 0.8rem;
    color: var(--navy-500);
    margin-top: 0.15rem;
}

.badge {
    padding: 0.25rem 0.65rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-info {
    background-color: var(--primary-light);
    color: var(--primary);
    border: 1px solid rgba(37, 99, 235, 0.2);
}

/* ==========================================================================
   LEFT SIDE: SVG SETUP CANVAS
   ========================================================================== */
.setup-card {
    min-height: 640px;
}

.svg-canvas-container {
    flex: 1;
    background-color: #f8fafc;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    overflow: hidden;
}

#experiment-svg {
    width: 100%;
    height: 100%;
    max-height: 640px;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.04));
}

/* ==========================================================================
   RIGHT SIDE: EXPERIMENT CONTROLS
   ========================================================================== */
.controls-body {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
}

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

.control-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--navy-600);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.button-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.button-grid.single-col {
    grid-template-columns: 1fr;
}

/* Button UI Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.7rem 1rem;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 600;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    user-select: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    filter: grayscale(0.5);
}

.btn-success {
    background-color: var(--success);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
}

.btn-success:hover:not(:disabled) {
    background-color: var(--success-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.btn-danger {
    background-color: var(--danger);
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

.btn-secondary {
    background-color: var(--navy-100);
    color: var(--navy-800);
    border-color: var(--border-dark);
}

.btn-secondary:hover:not(:disabled) {
    background-color: #e2e8f0;
    color: var(--navy-900);
}

.btn-navy {
    background-color: var(--navy-800);
    color: #ffffff;
    width: 100%;
}

.btn-navy:hover:not(:disabled) {
    background-color: var(--navy-900);
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.25);
}

.btn-outline {
    background-color: transparent;
    color: var(--navy-700);
    border-color: var(--border-dark);
}

.btn-outline:hover {
    background-color: var(--navy-100);
}

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
}

.divider {
    border: 0;
    border-top: 1px solid var(--border-color);
}

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

.slider-val-badge {
    background-color: var(--primary);
    color: #ffffff;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.85rem;
    padding: 0.15rem 0.6rem;
    border-radius: 12px;
}

.custom-range {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: #e2e8f0;
    outline: none;
    transition: background 0.15s ease-in-out;
}

.custom-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: 3px solid #ffffff;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    transition: transform 0.1s ease;
}

.custom-range::-webkit-slider-thumb:hover {
    transform: scale(1.15);
}

.preset-btn-group {
    display: flex;
    gap: 0.4rem;
    margin-top: 0.25rem;
}

.btn-preset {
    flex: 1;
    padding: 0.35rem 0;
    background: var(--navy-100);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--navy-700);
    cursor: pointer;
    transition: all 0.15s ease;
}

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

/* Live Readings Card Box */
.readings-card {
    background: linear-gradient(145deg, #0f172a, #1e293b);
    border-radius: var(--radius-md);
    padding: 1rem;
    color: #ffffff;
    box-shadow: var(--shadow-md);
}

.readings-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 0.5rem;
}

.pulse-dot {
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    animation: pulse-dot 1.5s infinite;
}

.readings-header h4 {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--navy-400);
}

.readings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.metric-box {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
}

.metric-label {
    font-size: 0.7rem;
    color: var(--navy-400);
    font-weight: 500;
}

.metric-value {
    font-family: var(--font-mono);
    font-size: 1.15rem;
    font-weight: 700;
    color: #ffffff;
    margin-top: 0.1rem;
}

.metric-value small {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--navy-400);
}

.text-indigo { color: #818cf8 !important; }
.text-emerald { color: #34d399 !important; }

.formula-mini-box {
    margin-top: 0.85rem;
    background: rgba(0, 0, 0, 0.3);
    padding: 0.4rem 0.6rem;
    border-radius: 4px;
    font-size: 0.72rem;
    color: var(--navy-400);
    text-align: center;
}

.formula-mini-box code {
    font-family: var(--font-mono);
    color: #6ee7b7;
    font-weight: 600;
}

/* ==========================================================================
   BOTTOM PANEL CONTAINER & TABS
   ========================================================================== */
.bottom-panel-container {
    max-width: 1600px;
    margin: 0 auto 2rem auto;
    padding: 0 1.25rem;
    width: 100%;
}

.tab-navigation {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    background-color: transparent;
    border: none;
    border-bottom: 3px solid transparent;
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--navy-600);
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: -2px;
}

.tab-btn:hover {
    color: var(--primary);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
    background-color: var(--bg-card);
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
}

.tab-content-wrapper {
    width: 100%;
}

.tab-pane {
    display: none;
}

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

.panel-card {
    padding: 0.5rem;
}

.graph-wrapper {
    padding: 1rem;
    position: relative;
    width: 100%;
    min-height: 280px;
}

/* ==========================================================================
   OBSERVATION TABLE STYLES
   ========================================================================== */
.table-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.table-responsive {
    overflow-x: auto;
    padding: 0.75rem;
}

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

.lab-table th {
    background-color: var(--navy-900);
    color: #ffffff;
    font-weight: 600;
    padding: 0.75rem 1rem;
    font-size: 0.8rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.lab-table th:first-child { border-top-left-radius: 6px; }
.lab-table th:last-child { border-top-right-radius: 6px; }

.lab-table td {
    padding: 0.7rem 1rem;
    border-bottom: 1px solid var(--border-color);
    font-family: var(--font-mono);
    color: var(--navy-800);
}

.lab-table tbody tr:nth-child(even) {
    background-color: #f8fafc;
}

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

.table-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 12px;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
}

.tb-no-flow { background-color: #f1f5f9; color: var(--navy-600); }
.tb-low-flow { background-color: #e0f2fe; color: #0369a1; }
.tb-med-flow { background-color: #dcfce7; color: #15803d; }
.tb-high-flow { background-color: #fef3c7; color: #b45309; }
.tb-max-flow { background-color: #fee2e2; color: #b91c1c; }

/* ==========================================================================
   THEORY & WORKING PRINCIPLE SECTION
   ========================================================================== */
.theory-container {
    padding: 1.25rem;
}

.theory-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

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

.theory-section {
    background-color: var(--bg-card-subtle);
    padding: 1.25rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.theory-section.full-width {
    grid-column: 1 / -1;
}

.section-badge {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--primary);
    background-color: var(--primary-light);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    margin-bottom: 0.5rem;
}

.theory-section h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--navy-900);
    margin-bottom: 0.5rem;
}

.theory-section p {
    font-size: 0.9rem;
    color: var(--navy-700);
    line-height: 1.6;
    margin-bottom: 0.85rem;
}

/* Equation Display Card */
.equation-card {
    background-color: #ffffff;
    border: 2px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 1rem;
    margin: 1rem 0;
    box-shadow: var(--shadow-sm);
}

.main-equation {
    font-family: var(--font-mono);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-hover);
    text-anchor: middle;
    text-align: center;
    margin-bottom: 0.75rem;
}

.equation-legend ul {
    list-style: none;
    font-size: 0.85rem;
    color: var(--navy-700);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem;
}

.code-math {
    background-color: var(--navy-900);
    color: #34d399;
    font-family: var(--font-mono);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    margin: 0.75rem 0;
    text-align: center;
}

/* Process Stepper */
.process-stepper {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    margin-top: 0.75rem;
}

.step-item {
    display: flex;
    gap: 0.85rem;
    align-items: flex-start;
    background-color: #ffffff;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
}

.step-num {
    width: 28px;
    height: 28px;
    background-color: var(--primary);
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.step-content strong {
    display: block;
    font-size: 0.9rem;
    color: var(--navy-900);
}

.step-content p {
    font-size: 0.82rem;
    color: var(--navy-600);
    margin-bottom: 0;
}

.theory-subgrid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.theory-subgrid h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--navy-900);
    margin-bottom: 0.5rem;
}

.theory-subgrid ul {
    padding-left: 1.2rem;
    font-size: 0.88rem;
    color: var(--navy-700);
    line-height: 1.6;
}

.theory-subgrid li {
    margin-bottom: 0.4rem;
}

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

/* Tablet */
@media screen and (max-width: 1024px) {
    .workspace-grid {
        grid-template-columns: 1fr;
        padding: 0 1rem;
        margin: 1rem auto;
        gap: 1rem;
    }
    .header-container, .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }
    .bottom-grid, .theory-subgrid {
        grid-template-columns: 1fr;
    }
}

/* Mobile Portrait */
@media screen and (max-width: 767px) and (orientation: portrait) {
    .workspace-grid {
        display: flex;
        flex-direction: column;
        padding: 0 0.5rem;
        margin: 0.5rem auto;
        gap: 0.75rem;
    }
    .bottom-grid {
        display: flex;
        flex-direction: column;
    }
    .theory-subgrid {
        grid-template-columns: 1fr;
    }
    .svg-viewport svg {
        width: 100%;
        height: auto;
        max-height: 50vh;
    }
    /* Touch-friendly targets */
    .btn, button, select, input[type="range"], .tab-btn {
        min-height: 44px;
        font-size: 16px !important;
    }
    .action-buttons {
        flex-direction: column;
    }
    .app-header, .lab-header {
        padding: 0.6rem 0.75rem;
    }
}

/* Mobile Landscape */
@media screen and (max-width: 950px) and (orientation: landscape) {
    .workspace-grid {
        display: grid;
        grid-template-columns: 1.2fr 0.8fr;
        gap: 0.75rem;
        padding: 0 0.5rem;
        margin: 0.5rem auto;
    }
    .bottom-grid {
        grid-template-columns: 1fr 1fr;
    }
}

/* ==========================================================================
   PrayogSetu Flow Transmitter — Black / Dark Mode Theme Overrides
   ========================================================================== */

html[data-theme="dark"],
html.dark {
    --bg-main: #080d18;
    --bg-card: #0f172a;
    --bg-card-subtle: #141e33;
    --border-color: #1e293b;
    --border-dark: #334155;
    --navy-900: #f8fafc;
    --navy-800: #e2e8f0;
    --navy-700: #cbd5e1;
    --navy-600: #94a3b8;
    --navy-500: #64748b;
    --navy-400: #94a3b8;
    --navy-100: #141e33;
}

html[data-theme="dark"] body,
html.dark body {
    background-color: #080d18;
    color: #f8fafc;
}

/* Cards & Headers */
html[data-theme="dark"] .card,
html.dark .card {
    background-color: #0f172a !important;
    border-color: #1e293b !important;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.4) !important;
}

html[data-theme="dark"] .card-header,
html.dark .card-header {
    background-color: #131d31 !important;
    border-bottom: 1px solid #1e293b !important;
    color: #f8fafc !important;
}

html[data-theme="dark"] .card-title,
html.dark .card-title,
html[data-theme="dark"] .card-title h3,
html.dark .card-title h3 {
    color: #f8fafc !important;
}

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

/* SVG Canvas Viewport & Bench Blueprint */
html[data-theme="dark"] .svg-canvas-container,
html.dark .svg-canvas-container {
    background: radial-gradient(circle at center, #0b1326 0%, #060a12 100%) !important;
    border-color: #1e293b !important;
}

html[data-theme="dark"] .svg-bg-rect,
html.dark .svg-bg-rect {
    fill: #0b1324 !important;
}

html[data-theme="dark"] #lab-grid path,
html.dark #lab-grid path {
    stroke: rgba(255, 255, 255, 0.05) !important;
}

/* SVG Equipment Text Labels */
html[data-theme="dark"] .svg-equipment-label,
html.dark .svg-equipment-label {
    fill: #cbd5e1 !important;
}

/* Fluid Velocity Mini Badge */
html[data-theme="dark"] .velocity-badge-rect,
html.dark .velocity-badge-rect {
    fill: #141e33 !important;
    stroke: #38bdf8 !important;
}

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

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

/* Buttons & Controls */
html[data-theme="dark"] .btn-secondary,
html.dark .btn-secondary {
    background-color: #1e293b !important;
    color: #cbd5e1 !important;
    border-color: #334155 !important;
}

html[data-theme="dark"] .btn-secondary:hover:not(:disabled),
html.dark .btn-secondary:hover:not(:disabled) {
    background-color: #334155 !important;
    color: #ffffff !important;
}

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

html[data-theme="dark"] .btn-navy:hover:not(:disabled),
html.dark .btn-navy:hover:not(:disabled) {
    background-color: #263550 !important;
    border-color: #38bdf8 !important;
}

html[data-theme="dark"] .btn-preset,
html.dark .btn-preset {
    background: #141e33 !important;
    border: 1px solid #1e293b !important;
    color: #94a3b8 !important;
}

html[data-theme="dark"] .btn-preset:hover,
html.dark .btn-preset:hover {
    background: #1e293b !important;
    color: #f8fafc !important;
    border-color: #38bdf8 !important;
}

html[data-theme="dark"] .btn-preset.active,
html.dark .btn-preset.active {
    background: #0284c7 !important;
    color: #ffffff !important;
    border-color: #0284c7 !important;
}

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

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

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

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

/* Readings Card */
html[data-theme="dark"] .readings-card,
html.dark .readings-card {
    background: linear-gradient(145deg, #0b1324, #141e33) !important;
    border: 1px solid #1e293b !important;
}

html[data-theme="dark"] .metric-box,
html.dark .metric-box {
    background: rgba(255, 255, 255, 0.03) !important;
    border-color: rgba(255, 255, 255, 0.07) !important;
}

/* Tabs */
html[data-theme="dark"] .tab-navigation,
html.dark .tab-navigation {
    border-bottom-color: #1e293b !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 {
    background-color: #0f172a !important;
    color: #38bdf8 !important;
    border-bottom-color: #38bdf8 !important;
}

/* Observation Table */
html[data-theme="dark"] .lab-table th,
html.dark .lab-table th {
    background-color: #141e33 !important;
    color: #38bdf8 !important;
    border-bottom: 1px solid #1e293b !important;
}

html[data-theme="dark"] .lab-table td,
html.dark .lab-table td {
    background-color: #0f172a !important;
    color: #cbd5e1 !important;
    border-bottom: 1px solid #1e293b !important;
}

html[data-theme="dark"] .lab-table tbody tr:nth-child(even) td,
html.dark .lab-table tbody tr:nth-child(even) td {
    background-color: #0d1526 !important;
}

html[data-theme="dark"] .lab-table tbody tr:hover td,
html.dark .lab-table tbody tr:hover td {
    background-color: #17243e !important;
}

/* Theory & Equations */
html[data-theme="dark"] .theory-section,
html.dark .theory-section {
    background-color: #141e33 !important;
    border-color: #1e293b !important;
}

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

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

html[data-theme="dark"] .equation-card,
html.dark .equation-card {
    background-color: #0b1324 !important;
    border-color: #38bdf8 !important;
}