/* 
 * Neural Network Playground - Modern Scientific Aesthetic 
 */

:root {
    --bg-primary: #0f172a;
    --bg-surface: #1e293b;
    --bg-surface-elevated: #334155;
    --border-color: #334155;
    --border-subtle: #475569;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-blue: #3b82f6;
    --accent-orange: #f97316;
    --accent-emerald: #10b981;
    --accent-indigo: #6366f1;
    --accent-amber: #f59e0b;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.25);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -2px rgba(0, 0, 0, 0.25);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header & Top Bar */
.playground-header {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 50;
}

.brand-section {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-title {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #60a5fa, #a855f7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-badge {
    font-size: 0.75rem;
    background: rgba(99, 102, 241, 0.15);
    color: #818cf8;
    padding: 3px 8px;
    border-radius: 9999px;
    border: 1px solid rgba(99, 102, 241, 0.3);
    font-weight: 600;
}

.task-progress-tracker {
    display: flex;
    align-items: center;
    gap: 16px;
}

.task-badge-pill {
    font-size: 0.85rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
}

.badge-practice {
    color: #60a5fa;
    border-color: rgba(96, 165, 250, 0.4);
}

.badge-test {
    color: #f59e0b;
    border-color: rgba(245, 158, 11, 0.5);
    background: rgba(245, 158, 11, 0.1);
}

/* Task Banner */
.task-banner-container {
    background: linear-gradient(180deg, rgba(30, 41, 59, 0.8) 0%, rgba(15, 23, 42, 0.8) 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(8px);
}

.task-banner-content h2 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.task-banner-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.task-banner-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.status-badge {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 9999px;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.3s ease;
}

.status-pending {
    background: rgba(148, 163, 184, 0.1);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.status-achieved {
    background: rgba(16, 185, 129, 0.2);
    color: #34d399;
    border: 1px solid #10b981;
    animation: pulseAchieved 2s infinite;
}

@keyframes pulseAchieved {
    0%, 100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    50% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: #ffffff;
    font-weight: 600;
    font-size: 0.85rem;
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.4);
}

/* Controls Bar */
.playground-toolbar {
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    padding: 10px 24px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 20px;
}

.playback-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-control {
    background: var(--bg-surface-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
    padding: 7px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

.btn-control:hover {
    background: #475569;
    border-color: #64748b;
}

.btn-control.btn-active-running {
    background: #ea580c;
    border-color: #f97316;
    color: #ffffff;
}

.epoch-display {
    display: flex;
    flex-direction: column;
    margin-left: 8px;
    padding-right: 16px;
    border-right: 1px solid var(--border-color);
}

.metric-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 600;
}

.metric-val {
    font-size: 1.1rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
}

.hyperparameter-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.param-select {
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    outline: none;
    cursor: pointer;
}

.param-select:focus {
    border-color: var(--accent-blue);
}

/* Main Studio Layout */
.playground-studio {
    display: grid;
    grid-template-columns: 240px 180px 1fr 340px;
    gap: 16px;
    padding: 20px 24px;
    flex: 1;
    overflow-x: auto;
}

.studio-panel {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    flex-direction: column;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.panel-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

/* Data Panel */
.dataset-picker-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    margin-bottom: 16px;
}

.dataset-picker-btn {
    background: var(--bg-surface-elevated);
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    padding: 10px 6px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.dataset-picker-btn:hover {
    border-color: var(--border-subtle);
    color: var(--text-primary);
}

.dataset-picker-btn.active {
    border-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.15);
    color: #ffffff;
}

.dataset-icon-svg {
    width: 32px;
    height: 32px;
}

.slider-group {
    margin-top: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.custom-range {
    width: 100%;
    accent-color: var(--accent-blue);
}

/* Features Column */
.features-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.feature-toggle-btn {
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    padding: 8px 10px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s;
}

.feature-toggle-btn:hover {
    border-color: #64748b;
    color: var(--text-primary);
}

.feature-toggle-btn.active {
    background: rgba(59, 130, 246, 0.2);
    border-color: var(--accent-blue);
    color: #93c5fd;
}

/* Network Graph Panel */
.network-architecture-panel {
    position: relative;
    overflow: hidden;
}

.layer-top-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-icon-subtle {
    background: var(--bg-surface-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    width: 24px;
    height: 24px;
    border-radius: 4px;
    font-size: 0.85rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-icon-subtle:hover {
    background: #475569;
}

.graph-wrapper {
    position: relative;
    flex: 1;
    min-height: 420px;
    display: flex;
}

#network-graph-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

#network-graph-container {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    width: 100%;
    z-index: 20;
}

.network-layer-column {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 80px;
}

.layer-header {
    text-align: center;
    margin-bottom: 12px;
    min-height: 40px;
}

.layer-title {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.layer-count {
    font-size: 0.65rem;
    color: var(--text-muted);
}

.neuron-controls {
    display: flex;
    gap: 4px;
    margin-top: 4px;
}

.layer-nodes-container {
    display: flex;
    flex-direction: column;
    gap: 16px;
    justify-content: center;
    flex: 1;
}

.network-node-card {
    background: #0f172a;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-sm);
    padding: 3px;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    box-shadow: var(--shadow-sm);
}

.node-thumb-canvas {
    border-radius: 4px;
    background: #000;
}

.node-bias-badge {
    font-size: 0.6rem;
    color: var(--text-muted);
    margin-top: 2px;
    font-variant-numeric: tabular-nums;
}

.input-feature-preview {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.15);
    border-radius: 4px;
    border: 1px dashed rgba(99, 102, 241, 0.4);
}

.feature-label {
    font-size: 0.7rem;
    font-weight: 700;
    color: #a5b4fc;
}

/* Output Panel */
.output-heatmap-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#main-heatmap-canvas {
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    background: #000;
}

.output-metrics-card {
    width: 100%;
    margin-top: 14px;
    background: var(--bg-surface-elevated);
    border-radius: var(--radius-sm);
    padding: 10px 14px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.metric-box {
    display: flex;
    flex-direction: column;
}

.color-legend-bar {
    width: 100%;
    margin-top: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.legend-gradient {
    flex: 1;
    height: 8px;
    margin: 0 8px;
    border-radius: 4px;
    background: linear-gradient(to right, #ea580c, #f8fafc, #2563eb);
}

/* Generic Rules Reference Panel (Group B) */
.rules-reference-panel {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: var(--radius-md);
    margin: 0 24px 20px 24px;
    overflow: hidden;
}

.rules-panel-header {
    padding: 12px 16px;
    background: #334155;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 0.9rem;
    color: #93c5fd;
}

.rules-panel-content {
    padding: 16px;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.rules-panel-content.collapsed {
    display: none;
}

.rule-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
}

.rule-card h4 {
    color: var(--text-primary);
    margin-bottom: 6px;
    font-size: 0.85rem;
}