:root {
    --bg-dark: #0f172a;
    --panel-dark: rgba(15, 23, 42, 0.7);
    --accent-cyan: #06b6d4;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-green: #10b981;
    --accent-pink: #ec4899;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: rgba(255, 255, 255, 0.1);
    --card-glass: rgba(30, 41, 59, 0.7);
    --hover-glass: rgba(255, 255, 255, 0.05);
}

#phet-stage {
    position: absolute;
    top: 0;
    left: 0;
    width: 1280px;
    height: 720px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-dark);
    transform-origin: top left;
    touch-action: none;
    /* Force zero-latency for Bionic Scaling */
}

/* --- PREMIUM SCIENCE-SIM NAVIGATION --- */
.sim-nav {
    position: relative !important;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.6rem 2rem;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 200;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.sim-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 700;
    text-decoration: none;
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--accent-cyan);
}

.logo-thin {
    font-weight: 300;
}

.nav-breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.nav-breadcrumbs a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

.nav-breadcrumbs a:hover {
    color: var(--accent-cyan);
}

.nav-breadcrumbs .sep {
    font-weight: 300;
    color: var(--text-muted);
}

.nav-breadcrumbs .current {
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-back {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.5rem 1.2rem;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.2s;
    border: 1px solid var(--border-color);
}

.nav-back:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.sim-page {
    background-color: var(--bg-dark);
    margin: 0;
    padding: 0;
    overflow: hidden;
    touch-action: none;
}

.sim-main {
    flex: 1;
    padding: 20px;
    overflow: hidden;
    display: flex;
    background: radial-gradient(circle at center, #1e293b 0%, #0f172a 100%);
    position: relative;
    box-shadow: inset 0 0 50px rgba(0, 0, 0, 0.3);
}

.simulator-container {
    display: grid;
    grid-template-columns: 350px 1fr;
    gap: 1.5rem;
    width: 100%;
    height: 100%;
    margin: 0;
    overflow: hidden;
}

/* Panel Styling */
.controls-panel,
.viz-panel {
    background: var(--card-glass);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-cyan) transparent;
}

.controls-panel::-webkit-scrollbar,
.viz-panel::-webkit-scrollbar {
    width: 4px;
}
.controls-panel::-webkit-scrollbar-track,
.viz-panel::-webkit-scrollbar-track {
    background: transparent;
}
.controls-panel::-webkit-scrollbar-thumb,
.viz-panel::-webkit-scrollbar-thumb {
    background: rgba(6, 182, 212, 0.3);
    border-radius: 10px;
}

.panel-header {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.panel-header i {
    color: var(--accent-cyan);
    font-size: 1.5rem;
}

.panel-header h2 {
    font-size: 1.4rem;
    font-weight: 700;
}

/* Control Elements */
.control-group {
    margin-bottom: 1.2rem;
}

.control-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

#algorithm-select,
#time-quantum,
#arrival-time,
#burst-time,
#priority-value {
    width: 100%;
    padding: 0.8rem;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: white;
    font-family: inherit;
    transition: all 0.3s ease;
}

#algorithm-select:focus,
#time-quantum:focus {
    border-color: var(--accent-cyan);
    outline: none;
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.2);
}

/* Process Form */
.add-process-form {
    background: rgba(15, 23, 42, 0.3);
    border: 1px dashed var(--border-color);
    padding: 1rem;
    border-radius: 15px;
    margin-bottom: 1.5rem;
}

.add-process-form h3 {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.8rem;
    margin-bottom: 0.8rem;
}

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

.btn-action {
    width: 100%;
    background: linear-gradient(135deg, #06b6d4, #3b82f6);
    color: white;
    border: none;
    padding: 0.8rem;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-action:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(6, 182, 212, 0.3);
}

/* Simulation Controls */
.simulation-controls {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    margin-bottom: 1.5rem;
}

.btn-sim-control {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.05);
    color: white;
    font-size: 1.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-sim-control:hover {
    background: var(--accent-cyan);
    border-color: var(--accent-cyan);
    transform: scale(1.1);
}

#play-pause-btn.playing {
    background: var(--accent-pink);
    border-color: var(--accent-pink);
}

/* Speed Slider */
.speed-control {
    margin-bottom: 1.5rem;
}

.speed-control label {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: block;
    margin-bottom: 0.5rem;
}

#speed-range {
    width: 100%;
    accent-color: var(--accent-cyan);
}

/* Process List */
.processes-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.processes-table th {
    text-align: left;
    color: var(--text-muted);
    padding: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.processes-table td {
    padding: 0.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.btn-delete {
    background: none;
    border: none;
    color: #ef4444;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.3s;
}

.btn-delete:hover {
    opacity: 1;
}

/* Right Panel: Visualization */
.viz-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* CPU Core */
.viz-header {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: 1.5rem;
}

.cpu-card {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.cpu-core {
    width: 150px;
    height: 150px;
    background: radial-gradient(circle at 30% 30%, #334155, #0f172a);
    border-radius: 20px;
    position: relative;
    padding: 15px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
    margin-bottom: 1rem;
    border: 2px solid #334155;
}

.core-inner {
    width: 100%;
    height: 100%;
    background: #1e293b;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    font-family: 'Space Grotesk', sans-serif;
}

.core-inner span {
    font-weight: 700;
    color: var(--accent-cyan);
    margin-bottom: 10px;
}

.progress-bar-container {
    width: 80%;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(to right, var(--accent-cyan), var(--accent-blue));
    transition: width 0.3s ease;
}

.cpu-stats {
    display: flex;
    width: 100%;
    justify-content: space-around;
}

.stat-box {
    text-align: center;
}

.stat-box .label {
    display: block;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.stat-box .value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* Educational Insight */
.educational-insight {
    background: rgba(6, 182, 212, 0.05);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 20px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    position: relative;
}

.educational-insight::before {
    content: '💡';
    font-size: 1.5rem;
    margin-right: 1rem;
}

#insight-text {
    font-style: italic;
    color: #e2e8f0;
    font-size: 1.05rem;
    line-height: 1.5;
}

/* Section Labels */
.section-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 700;
    letter-spacing: 2px;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

/* Ready Queue */
.ready-queue {
    min-height: 70px;
    background: rgba(15, 23, 42, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    display: flex;
    align-items: center;
    padding: 1rem;
    gap: 0.8rem;
    overflow-x: auto;
}

.queue-item {
    min-width: 60px;
    height: 50px;
    background: var(--panel-dark);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    animation: slideInRight 0.3s ease;
}

@keyframes slideInRight {
    from {
        transform: translateX(50px);
        opacity: 0;
    }

    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Gantt Chart */
.gantt-chart-wrapper {
    background: rgba(15, 23, 42, 0.3);
    border-radius: 15px;
    padding: 1.5rem 1rem;
    overflow-x: auto;
}

.gantt-chart {
    display: flex;
    height: 40px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 5px;
    margin-bottom: 5px;
    min-width: 600px;
}

.gantt-block {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 800;
    color: white;
    border-right: 1px solid rgba(0, 0, 0, 0.1);
    transition: width 0.3s ease;
    overflow: hidden;
    white-space: nowrap;
}

.gantt-timeline {
    display: flex;
    min-width: 600px;
    position: relative;
    height: 20px;
}

.timeline-mark {
    position: absolute;
    font-size: 0.7rem;
    color: var(--text-muted);
    transform: translateX(-50%);
}

/* Analytics Table */
.analytics-table-wrapper {
    overflow-x: auto;
}

.analytics-table {
    width: 100%;
    border-collapse: collapse;
}

.analytics-table th {
    text-align: left;
    padding: 0.8rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
}

.analytics-table td {
    padding: 0.8rem;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.average-row {
    background: rgba(6, 182, 212, 0.05);
    font-weight: 700;
    color: var(--accent-cyan);
}

/* Process Colors */
.p-color-0 {
    background: #3b82f6;
}

.p-color-1 {
    background: #10b981;
}

.p-color-2 {
    background: #8b5cf6;
}

.p-color-3 {
    background: #f59e0b;
}

.p-color-4 {
    background: #ec4899;
}

.p-color-5 {
    background: #06b6d4;
}

.p-color-6 {
    background: #f43f5e;
}

.p-color-7 {
    background: #84cc16;
}

.p-idle {
    background: #334155;
    opacity: 0.3;
}

/* Responsive */