/* Faraday's Law Virtual Physics Laboratory - Style System */

:root {
    --bg-main: #0b0f19;
    --bg-card: #151c2c;
    --bg-card-hover: #1e273e;
    --bg-input: #0f1422;
    --border-color: #27344d;
    --border-highlight: #3b82f6;
    
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --text-dim: #64748b;
    
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --secondary: #64748b;
    --secondary-hover: #475569;
    --accent: #8b5cf6;
    --accent-hover: #7c3aed;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;

    --north-pole: #ef4444;
    --south-pole: #3b82f6;
    --coil-copper: #d97706;
    --field-line: #a855f7;

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

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
}

html:not(.dark), html[data-theme="light"] {
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --bg-card-hover: #f1f5f9;
    --bg-input: #ffffff;
    --border-color: #e2e8f0;
    --border-highlight: #2563eb;
    --text-main: #0f172a;
    --text-muted: #475569;
    --text-dim: #64748b;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05);
}

html:not(.dark) .canvas-container, html[data-theme="light"] .canvas-container {
    background: #ffffff;
    border-color: #cbd5e1;
}

html:not(.dark) .canvas-drag-hint, html[data-theme="light"] .canvas-drag-hint {
    background: rgba(255, 255, 255, 0.88);
    color: #475569;
    border: 1px solid #cbd5e1;
}

* {
    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;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--bg-card);
    padding: 16px 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
}

.brand {
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: rgba(59, 130, 246, 0.15);
    border: 1px solid var(--primary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
}

.brand-text .org-name {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--primary);
    display: block;
}

.brand-text .lab-title {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-main);
    margin: 0;
}

.header-actions {
    display: flex;
    gap: 12px;
}

/* Mode Bar */
.mode-bar {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--bg-card);
    padding: 12px 20px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.mode-label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-muted);
}

.mode-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.mode-btn {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.mode-num {
    background: rgba(255, 255, 255, 0.1);
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
}

.mode-btn:hover {
    background: var(--bg-card-hover);
    color: var(--text-main);
}

.mode-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
    box-shadow: 0 0 12px rgba(59, 130, 246, 0.4);
}

.mode-btn.active .mode-num {
    background: rgba(255, 255, 255, 0.25);
}

/* Workspace Layout */
.lab-workspace {
    display: grid;
    grid-template-columns: 2.2fr 1fr;
    gap: 20px;
}

/* Generic Card */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-md);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-color);
}

.card-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Hero Section */
.hero-section {
    grid-column: 1 / 2;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.dot-indicator {
    width: 10px;
    height: 10px;
    background-color: var(--success);
    border-radius: 50%;
    display: inline-block;
}

.dot-indicator.pulse {
    box-shadow: 0 0 8px var(--success);
    animation: pulse-glow 2s infinite;
}

@keyframes pulse-glow {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.2); }
}

.motion-status-badge {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: var(--radius-sm);
}

/* Canvas Container */
.canvas-container {
    position: relative;
    width: 100%;
    background: #090d16;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

#experimentCanvas {
    display: block;
    width: 100%;
    height: auto;
    max-height: 420px;
    cursor: grab;
}

#experimentCanvas:active {
    cursor: grabbing;
}

.canvas-drag-hint {
    position: absolute;
    bottom: 10px;
    right: 12px;
    font-size: 0.75rem;
    color: var(--text-dim);
    background: rgba(15, 20, 34, 0.75);
    backdrop-filter: blur(4px);
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: 6px;
    pointer-events: none;
}

/* Action Controls Bar */
.experiment-controls-bar {
    display: flex;
    justify-content: center;
    background: var(--bg-input);
    padding: 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.action-btn-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

/* Buttons */
.btn {
    font-family: var(--font-sans);
    font-size: 0.88rem;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-action {
    padding: 10px 20px;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

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

.btn-action.primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 0 12px rgba(59, 130, 246, 0.4);
}

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

.btn-action.accent:hover {
    background: var(--accent-hover);
    box-shadow: 0 0 12px rgba(139, 92, 246, 0.4);
}

.btn-action.warning {
    background: var(--warning);
    color: #0f1422;
}

.btn-action.warning:hover {
    background: #d97706;
}

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

.btn-action.secondary:hover {
    background: var(--secondary-hover);
}

.btn-secondary {
    background: var(--bg-input);
    border-color: var(--border-color);
    color: var(--text-main);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--text-dim);
}

.btn-outline {
    background: transparent;
    border-color: var(--border-color);
    color: var(--text-muted);
}

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

.btn-outline.danger:hover {
    border-color: var(--danger);
    color: var(--danger);
}

.btn-sm {
    padding: 4px 10px;
    font-size: 0.78rem;
}

/* Control Panel */
.control-panel {
    grid-column: 2 / 3;
}

.controls-grid {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    background: var(--bg-input);
    padding: 12px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.control-label-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.control-label-row label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-main);
}

.value-badge {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--primary);
    background: rgba(59, 130, 246, 0.12);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

input[type="range"] {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
    accent-color: var(--primary);
}

.slider-ticks {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-dim);
    font-family: var(--font-mono);
}

/* Dashboard Panel */
.dashboard-card {
    grid-column: 1 / 3;
}

.live-tag {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.8px;
    color: var(--success);
    background: rgba(16, 185, 129, 0.12);
    border: 1px solid rgba(16, 185, 129, 0.3);
    padding: 3px 8px;
    border-radius: var(--radius-sm);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 12px;
}

.metric-box {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.metric-box.highlight-blue {
    border-color: rgba(59, 130, 246, 0.4);
    background: rgba(59, 130, 246, 0.05);
}

.metric-box.highlight-purple {
    border-color: rgba(168, 85, 247, 0.4);
    background: rgba(168, 85, 247, 0.05);
}

.metric-box.highlight-green {
    border-color: rgba(16, 185, 129, 0.4);
    background: rgba(16, 185, 129, 0.05);
}

.metric-box.highlight-amber {
    border-color: rgba(245, 158, 11, 0.4);
    background: rgba(245, 158, 11, 0.05);
}

.metric-label {
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--text-muted);
}

.metric-value-row {
    display: flex;
    align-items: baseline;
    gap: 4px;
}

.metric-num {
    font-family: var(--font-mono);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-main);
}

.metric-unit {
    font-size: 0.8rem;
    color: var(--text-dim);
}

/* Real-Time Graphs */
.graphs-card {
    grid-column: 1 / 3;
}

.graphs-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.graph-container {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.graph-title-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.graph-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.graph-curr-val {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
}

.graph-container canvas {
    width: 100%;
    height: 180px;
    background: #090d16;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    display: block;
}

/* Verification Panel */
.verification-card {
    grid-column: 1 / 3;
}

.verification-status {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 700;
    padding: 4px 14px;
    border-radius: var(--radius-sm);
    letter-spacing: 0.5px;
}

.verification-status.verified {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid var(--success);
    color: var(--success);
}

.verification-status.unverified {
    background: rgba(100, 116, 139, 0.15);
    border: 1px solid var(--secondary);
    color: var(--text-dim);
}

.verification-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
}

.ver-box {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.ver-label {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.ver-val {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-main);
}

.ver-val.highlight {
    color: var(--primary);
}

.ver-footnote {
    margin-top: 12px;
    font-size: 0.85rem;
    color: var(--text-muted);
    background: rgba(15, 20, 34, 0.6);
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--primary);
}

.formula-inline {
    font-family: var(--font-mono);
    color: var(--primary);
}

/* Observation Table */
.table-card {
    grid-column: 1 / 3;
}

.table-actions {
    display: flex;
    gap: 10px;
}

.table-responsive {
    overflow-x: auto;
    max-height: 320px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

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

.data-table th {
    background: var(--bg-input);
    color: var(--text-muted);
    font-weight: 600;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1;
}

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

.data-table tbody tr:hover {
    background: var(--bg-card-hover);
}

.empty-table-msg {
    text-align: center;
    padding: 24px;
    color: var(--text-dim);
    font-size: 0.9rem;
}

/* Guided Procedure */
.procedure-card {
    grid-column: 1 / 3;
}

.step-counter {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--primary);
    background: rgba(59, 130, 246, 0.12);
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.procedure-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 12px;
}

.proc-step {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px;
    display: flex;
    gap: 12px;
    align-items: flex-start;
    transition: all 0.2s ease;
}

.proc-step.active {
    border-color: var(--primary);
    background: rgba(59, 130, 246, 0.06);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.2);
}

.step-num {
    width: 24px;
    height: 24px;
    background: var(--border-color);
    color: var(--text-muted);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.78rem;
    font-weight: 700;
    flex-shrink: 0;
}

.proc-step.active .step-num {
    background: var(--primary);
    color: #ffffff;
}

.step-content {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.4;
}

.proc-step.active .step-content {
    color: var(--text-main);
}

/* Theory Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.modal-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.modal-content {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 680px;
    max-height: 85vh;
    overflow-y: auto;
    padding: 24px;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 12px;
}

.modal-header h2 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-main);
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover {
    color: var(--danger);
}

.modal-body h3 {
    font-size: 0.95rem;
    color: var(--primary);
    margin-top: 14px;
    margin-bottom: 6px;
}

.modal-body p, .modal-body li {
    font-size: 0.88rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.modal-body ul, .modal-body ol {
    margin-left: 20px;
    margin-bottom: 10px;
}

.equation-box {
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 10px 16px;
    font-family: var(--font-mono);
    font-size: 1.05rem;
    color: var(--success);
    text-align: center;
    margin: 8px 0;
}

/* Footer */
.app-footer {
    text-align: center;
    padding: 16px;
    color: var(--text-dim);
    font-size: 0.8rem;
    border-top: 1px solid var(--border-color);
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
    .lab-workspace {
        grid-template-columns: 1fr;
    }
    
    .hero-section, .control-panel, .dashboard-card, .graphs-card, .verification-card, .table-card, .procedure-card {
        grid-column: 1 / -1;
    }
    
    .graphs-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .app-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .header-actions {
        width: 100%;
        justify-content: space-between;
    }
    
    .action-btn-group {
        flex-direction: column;
        width: 100%;
    }
    
    .btn-action {
        width: 100%;
        justify-content: center;
    }
    
    .procedure-list {
        grid-template-columns: 1fr;
    }
}