@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    /* Light Mode Colors */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --warning-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    
    --bg-light: #f8f9ff;
    --card-bg-light: rgba(255, 255, 255, 0.95);
    --text-primary-light: #1a202c;
    --text-secondary-light: #4a5568;
    --border-light: rgba(0, 0, 0, 0.08);
    --shadow-light: 0 10px 40px rgba(0, 0, 0, 0.08);
    
    /* Dark Mode Colors */
    --bg-dark: #0f1419;
    --card-bg-dark: rgba(26, 32, 44, 0.95);
    --text-primary-dark: #f7fafc;
    --text-secondary-dark: #cbd5e0;
    --border-dark: rgba(255, 255, 255, 0.1);
    --shadow-dark: 0 10px 40px rgba(0, 0, 0, 0.5);
    
    /* Semantic Colors */
    --accent-purple: #667eea;
    --accent-pink: #f093fb;
    --accent-blue: #4facfe;
    --accent-green: #00f2fe;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    overflow-x: hidden;
}

body.light-mode {
    background: var(--bg-light);
    background-image: 
        radial-gradient(at 0% 0%, rgba(102, 126, 234, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(240, 147, 251, 0.1) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(79, 172, 254, 0.1) 0px, transparent 50%);
    color: var(--text-primary-light);
}

body.dark-mode {
    background: var(--bg-dark);
    background-image: 
        radial-gradient(at 0% 0%, rgba(102, 126, 234, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(240, 147, 251, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(79, 172, 254, 0.15) 0px, transparent 50%);
    color: var(--text-primary-dark);
}

#app {
    max-width: 1600px;
    margin: 0 auto;
    padding: 20px;
}

.card {
    background: var(--card-bg-light);
    backdrop-filter: blur(20px);
    padding: 28px;
    border-radius: 20px;
    box-shadow: var(--shadow-light);
    margin-bottom: 24px;
    border: 1px solid var(--border-light);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity 0.3s;
}

.card:hover::before {
    opacity: 1;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.12);
}

body.dark-mode .card {
    background: var(--card-bg-dark);
    box-shadow: var(--shadow-dark);
    border: 1px solid var(--border-dark);
}

body.dark-mode .card:hover {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.6);
}

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0 20px 0;
}

header h1 {
    font-size: 3.5rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
    letter-spacing: -1px;
    animation: fadeInDown 0.8s ease-out;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.top-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.theme-switcher {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--card-bg-light);
    padding: 8px 16px;
    border-radius: 30px;
    border: 1px solid var(--border-light);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

body.dark-mode .theme-switcher {
    background: var(--card-bg-dark);
    border-color: var(--border-dark);
}

.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
}

.switch input { 
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: .4s;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: .4s;
}

input:checked + .slider {
  background-color: var(--primary-color);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.slider.round {
  border-radius: 34px;
}

.slider.round:before {
  border-radius: 50%;
}

.controls {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.controls .btn {
    padding: 12px 24px;
    border: none;
    border-radius: 12px;
    background: var(--primary-gradient);
    color: white;
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Inter', sans-serif;
}

.controls .btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(102, 126, 234, 0.5);
}

.controls .btn:active {
    transform: translateY(0);
}

.controls .btn i {
    font-size: 1.1em;
}

#add-process-form {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr auto;
    gap: 12px;
    margin-bottom: 20px;
}

#add-process-form input {
    padding: 14px 18px;
    border-radius: 12px;
    border: 2px solid var(--border-light);
    background: transparent;
    font-size: 0.95rem;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s;
    color: inherit;
}

#add-process-form input:focus {
    outline: none;
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

body.dark-mode #add-process-form input {
    border-color: var(--border-dark);
    background: rgba(255, 255, 255, 0.05);
}

body.dark-mode #add-process-form input:focus {
    border-color: var(--accent-purple);
}

.btn-add {
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    background: var(--success-gradient);
    color: white;
    cursor: pointer;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(79, 172, 254, 0.3);
}

.btn-add:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(79, 172, 254, 0.4);
}

.input-section, .simulation-section, .explanation-section {
    margin-bottom: 20px;
}

.list-group {
    margin-top: 16px;
    display: grid;
    gap: 12px;
}

.list-group-item {
    padding: 16px 20px;
    border: 2px solid var(--border-light);
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: grab;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(10px);
}

.list-group-item:hover {
    transform: translateX(8px);
    border-color: var(--accent-purple);
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.2);
}

.list-group-item:active {
    cursor: grabbing;
}

body.dark-mode .list-group-item {
    border-color: var(--border-dark);
    background: linear-gradient(135deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
}

.delete-btn {
    background: var(--secondary-gradient);
    color: white;
    border: none;
    border-radius: 8px;
    width: 32px;
    height: 32px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    transition: all 0.3s;
    box-shadow: 0 2px 8px rgba(245, 87, 108, 0.3);
}

.delete-btn:hover {
    transform: scale(1.1) rotate(90deg);
    box-shadow: 0 4px 15px rgba(245, 87, 108, 0.5);
}

.gantt-chart-container {
    position: relative;
    margin-bottom: 20px;
}

.gantt-chart {
    height: 80px;
    border: 2px solid var(--border-light);
    margin-bottom: 16px;
    position: relative;
    background: linear-gradient(180deg, rgba(0,0,0,0.02) 0%, rgba(0,0,0,0.04) 100%);
    border-radius: 12px;
    overflow: hidden;
}

body.dark-mode .gantt-chart {
    border-color: var(--border-dark);
    background: linear-gradient(180deg, rgba(255,255,255,0.02) 0%, rgba(255,255,255,0.04) 100%);
}

.gantt-timeline {
    display: flex;
    justify-content: space-between;
    padding: 0 12px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary-light);
}

body.dark-mode .gantt-timeline {
    color: var(--text-secondary-dark);
}

.gantt-bar {
    position: absolute;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 8px;
    margin: 4px;
    height: calc(100% - 8px);
}

.gantt-bar:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.25);
    z-index: 10;
}

.gantt-bar span {
    padding: 0 12px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.metrics {
    font-size: 0.95rem;
}

.metrics table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 16px;
    border-radius: 12px;
    overflow: hidden;
}

.metrics th, .metrics td {
    padding: 14px 16px;
    text-align: left;
}

.metrics thead {
    background: var(--primary-gradient);
    color: white;
}

.metrics th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.metrics tbody tr {
    background: rgba(0, 0, 0, 0.02);
    transition: all 0.2s;
}

body.dark-mode .metrics tbody tr {
    background: rgba(255, 255, 255, 0.03);
}

.metrics tbody tr:hover {
    background: rgba(102, 126, 234, 0.1);
    transform: scale(1.01);
}

.metrics tbody tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.04);
}

body.dark-mode .metrics tbody tr:nth-child(even) {
    background: rgba(255, 255, 255, 0.05);
}

.improvement {
    margin-top: 16px;
    padding: 16px 20px;
    background: linear-gradient(135deg, rgba(0, 242, 254, 0.1) 0%, rgba(79, 172, 254, 0.1) 100%);
    border-left: 4px solid var(--accent-blue);
    border-radius: 12px;
    animation: slideInRight 0.5s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

#game-section {
    margin-top: 20px;
    padding: 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
    background-color: #f9f9f9;
}

.hidden {
    display: none;
}

#level-selection {
    margin-top: 20px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.level-btn {
    padding: 12px 24px;
    border: 2px solid var(--border-light);
    border-radius: 12px;
    background: transparent;
    color: inherit;
    cursor: pointer;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.level-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--warning-gradient);
    transition: left 0.3s;
    z-index: -1;
}

.level-btn:hover::before {
    left: 0;
}

.level-btn:hover {
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(250, 112, 154, 0.4);
}

body.dark-mode .level-btn {
    border-color: var(--border-dark);
}

/* Algorithm Insights Panel */
#insights-container {
    margin-top: 20px;
    padding: 24px;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.1);
}

#insights-container h3 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.insights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin-top: 16px;
}

.insight-card {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 16px;
    padding: 20px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.insight-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--primary-gradient);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.insight-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.2);
    border-color: rgba(102, 126, 234, 0.4);
}

.insight-card:hover::before {
    transform: scaleX(1);
}

.insight-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
    display: block;
}

.insight-card h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 10px;
    font-weight: 600;
}

.insight-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
    margin: 0;
}

#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
}

.modal {
    display: block;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--card-bg-light);
    margin: 10% auto;
    padding: 40px;
    border: none;
    width: 90%;
    max-width: 600px;
    border-radius: 24px;
    text-align: center;
    box-shadow: 0 20px 80px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

body.dark-mode .modal-content {
    background: var(--card-bg-dark);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.close-btn {
    color: var(--text-secondary-light);
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 28px;
    font-weight: normal;
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s;
}

body.dark-mode .close-btn {
    color: var(--text-secondary-dark);
}

.close-btn:hover {
    background: rgba(0, 0, 0, 0.1);
    transform: rotate(90deg);
}

body.dark-mode .close-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.story-text {
    margin: 30px 0;
    line-height: 2;
    font-size: 1.05rem;
    color: var(--text-secondary-light);
}

body.dark-mode .story-text {
    color: var(--text-secondary-dark);
}

.modal-content h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

#start-game-btn {
    margin-top: 20px;
    padding: 12px 30px;
    font-size: 1.1em;
    background: linear-gradient(135deg, #4CAF50, #45a049);
}

.speed-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin: 16px 0;
    padding: 16px;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

#speed-slider {
    width: 200px;
    height: 6px;
    border-radius: 10px;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

#speed-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-gradient);
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    transition: all 0.3s ease;
}

#speed-slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

#speed-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-gradient);
    cursor: pointer;
    border: none;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
    transition: all 0.3s ease;
}

#speed-slider::-moz-range-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.progress-container {
    width: 100%;
    height: 12px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 20px;
    margin: 16px 0;
    overflow: hidden;
    box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.1);
}

.progress-bar {
    height: 100%;
    background: var(--success-gradient);
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 20px;
    position: relative;
    overflow: hidden;
}

.progress-bar::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.log-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.btn-small {
    padding: 5px 10px;
    border: none;
    border-radius: 4px;
    background-color: #2196F3;
    color: white;
    cursor: pointer;
    font-size: 0.9em;
}

.btn-small:hover {
    background-color: #0b7dda;
}

#explanation-log {
    max-height: 300px;
    overflow-y: auto;
    padding: 20px;
    border-radius: 16px;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.1);
}

#explanation-log::-webkit-scrollbar {
    width: 8px;
}

#explanation-log::-webkit-scrollbar-track {
    background: rgba(102, 126, 234, 0.05);
    border-radius: 10px;
}

#explanation-log::-webkit-scrollbar-thumb {
    background: var(--primary-gradient);
    border-radius: 10px;
}

body.dark-mode #explanation-log {
    background: rgba(255, 255, 255, 0.03);
    border-color: rgba(102, 126, 234, 0.2);
}

.log-entry {
    margin: 8px 0;
    padding: 12px 16px;
    border-left: 4px solid #4CAF50;
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.05) 0%, rgba(69, 160, 73, 0.05) 100%);
    border-radius: 8px;
    color: var(--text-primary);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

body.dark-mode .log-entry {
    background: rgba(76, 175, 80, 0.1);
}

.log-entry.warning {
    border-left-color: #ff9800;
    background: linear-gradient(135deg, rgba(255, 152, 0, 0.05) 0%, rgba(255, 140, 0, 0.05) 100%);
}

body.dark-mode .log-entry.warning {
    background: rgba(255, 152, 0, 0.1);
}

.log-entry.success {
    border-left-color: #4CAF50;
}

.btn-predict {
    margin: 12px;
    padding: 20px 40px;
    border: none;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 600;
    font-size: 1.2rem;
    font-family: 'Inter', sans-serif;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    position: relative;
    border: 2px solid rgba(102, 126, 234, 0.2);
}

.btn-predict:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
    background: rgba(102, 126, 234, 0.1);
    border-color: rgba(102, 126, 234, 0.4);
}

.btn-predict.selected {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.5);
    transform: translateY(-3px) scale(1.05);
}

.btn-predict.selected::before {
    content: '✓';
    position: absolute;
    top: 8px;
    right: 12px;
    font-size: 1.2rem;
    font-weight: bold;
}

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

/* Mobile Responsiveness */
@media screen and (max-width: 768px) {
    #app {
        padding: 10px;
    }
    
    .simulation-section {
        flex-direction: column;
    }
    
    .algorithm-container {
        width: 100%;
    }
    
    #add-process-form {
        flex-direction: column;
    }
    
    .controls {
        flex-wrap: wrap;
    }
    
    .controls .btn {
        margin: 5px;
        padding: 8px 12px;
        font-size: 0.9em;
    }
    
    .modal-content {
        width: 95%;
        margin: 10% auto;
    }
}

/* Dashboard Styles */
.stats-dashboard {
    margin: 24px 0;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}

.stat-card {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    padding: 24px;
    border-radius: 16px;
    text-align: center;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.2);
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.3);
}

.stat-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.stat-value {
    font-size: 2rem;
    font-weight: bold;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

#performance-chart {
    width: 100%;
    height: 200px;
    border-radius: 16px;
    background: rgba(102, 126, 234, 0.05);
    padding: 16px;
}

.btn-docs {
    background: var(--success-gradient) !important;
    margin-right: 16px;
}

.btn-docs:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(79, 172, 254, 0.4);
}

/* Challenge Section Polish */
#challenge {
    padding: 24px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-radius: 20px;
    margin-bottom: 24px;
    border: 2px solid rgba(102, 126, 234, 0.1);
}

.challenge-question {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 24px;
}

.prediction-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

#level-selection {
    padding: 20px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    margin-bottom: 20px;
}

#level-selection p {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
    text-align: center;
}

/* Quiz Styling */
#quiz {
    padding: 24px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-radius: 20px;
    margin-top: 24px;
}

.quiz-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 20px;
}

.quiz-option {
    padding: 16px 24px;
    border: none;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: 2px solid rgba(102, 126, 234, 0.2);
}

.quiz-option:hover:not(:disabled) {
    background: rgba(102, 126, 234, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.quiz-option:disabled {
    cursor: not-allowed;
    opacity: 0.9;
}

.quiz-option:active:not(:disabled) {
    transform: translateY(0);
}

/* Examples Section */
.examples-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    margin: 16px 0;
    padding: 16px;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.examples-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.example-buttons {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
}

.example-btn {
    padding: 10px 20px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(79, 172, 254, 0.1) 0%, rgba(0, 242, 254, 0.1) 100%);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border: 2px solid rgba(79, 172, 254, 0.3);
}

.example-btn:hover {
    background: var(--success-gradient);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(79, 172, 254, 0.4);
}

.example-btn:active {
    transform: translateY(0);
}

/* Mode Selector */
.mode-selector {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin: 16px 0;
    padding: 16px;
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.mode-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
}

.mode-buttons {
    display: flex;
    gap: 12px;
}

.mode-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 12px;
    background: rgba(102, 126, 234, 0.1);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.mode-btn i {
    margin-right: 8px;
}

.mode-btn:hover {
    background: rgba(102, 126, 234, 0.2);
    transform: translateY(-2px);
}

.mode-btn.active {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

.mode-btn:active {
    transform: translateY(0);
}

/* Real-time indicator */
.realtime-indicator {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 20px;
    background: var(--warning-gradient);
    color: white;
    border-radius: 12px;
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(250, 112, 154, 0.4);
    animation: pulse 2s infinite;
    z-index: 1000;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.9; }
}

.realtime-indicator::before {
    content: '🔴';
    margin-right: 8px;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* Process execution highlight */
.gantt-bar.executing {
    animation: executing-pulse 1s infinite, glow-pulse 2s infinite;
    border: 3px solid #4CAF50;
    box-shadow: 0 0 20px rgba(76, 175, 80, 0.6);
    position: relative;
    overflow: visible;
}

.gantt-bar.executing::before {
    content: '⚙️';
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.2rem;
    animation: spin 2s linear infinite;
}

@keyframes executing-pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.02); }
}

@keyframes glow-pulse {
    0%, 100% { box-shadow: 0 0 20px rgba(76, 175, 80, 0.6); }
    50% { box-shadow: 0 0 30px rgba(76, 175, 80, 0.9); }
}

@keyframes spin {
    from { transform: translateX(-50%) rotate(0deg); }
    to { transform: translateX(-50%) rotate(360deg); }
}

/* Timeline marker */
.timeline-marker {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, #ff6b6b, #ee5a6f);
    box-shadow: 0 0 15px rgba(255, 107, 107, 0.8);
    z-index: 10;
    transition: left 0.3s ease;
    animation: marker-glow 1.5s infinite;
}

.timeline-marker::before {
    content: '▼';
    position: absolute;
    top: -22px;
    left: 50%;
    transform: translateX(-50%);
    color: #ff6b6b;
    font-size: 1.2rem;
    animation: bounce 1s infinite;
}

.timeline-marker::after {
    content: '';
    position: absolute;
    top: 0;
    left: -5px;
    width: 13px;
    height: 100%;
    background: rgba(255, 107, 107, 0.1);
    filter: blur(8px);
}

@keyframes marker-glow {
    0%, 100% { box-shadow: 0 0 15px rgba(255, 107, 107, 0.8); }
    50% { box-shadow: 0 0 25px rgba(255, 107, 107, 1); }
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-5px); }
}

/* Flowchart Visualization */
.flowchart-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    padding: 32px 16px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    border-radius: 20px;
    margin: 24px 0;
    flex-wrap: wrap;
}

.flow-step {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 16px;
    text-align: center;
    min-width: 180px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    border: 2px solid rgba(102, 126, 234, 0.2);
    transition: all 0.3s ease;
}

.flow-step:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(102, 126, 234, 0.3);
    border-color: rgba(102, 126, 234, 0.4);
}

.flow-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.flow-step h3 {
    margin: 12px 0 8px 0;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: 1.1rem;
}

.flow-step p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0;
    line-height: 1.5;
}

.flow-arrow {
    font-size: 2rem;
    color: var(--accent-primary);
    font-weight: bold;
    animation: pulse-arrow 2s infinite;
}

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

/* Comparison Section */
.comparison-highlight {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 24px;
    align-items: center;
    margin-top: 24px;
}

.comparison-card {
    background: rgba(255, 255, 255, 0.05);
    padding: 24px;
    border-radius: 16px;
    border: 2px solid rgba(240, 147, 251, 0.3);
}

.comparison-card.highlight-sjf {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border: 2px solid rgba(102, 126, 234, 0.5);
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.2);
}

.comparison-card h3 {
    margin-top: 0;
    color: var(--text-primary);
    font-size: 1.2rem;
    margin-bottom: 16px;
}

.comparison-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.comparison-card li {
    padding: 8px 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

.vs-divider {
    font-size: 2rem;
    font-weight: bold;
    background: var(--warning-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    padding: 16px;
    border-radius: 50%;
    background-color: rgba(250, 112, 154, 0.1);
}

@media screen and (max-width: 968px) {
    .flowchart-container {
        flex-direction: column;
    }
    
    .flow-arrow {
        transform: rotate(90deg);
    }
    
    .comparison-highlight {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .vs-divider {
        text-align: center;
    }
}