/* Chapter 7 Specific Styles */
.champion-header {
    background: linear-gradient(135deg, #FFD700 0%, #FF8C00 50%, #C73E1D 100%);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    margin: 2rem 0;
    position: relative;
    overflow: hidden;
    color: white;
}

.champion-header::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: repeating-linear-gradient(
        45deg,
        rgba(255,255,255,0.1) 0px,
        rgba(255,255,255,0.1) 2px,
        transparent 2px,
        transparent 20px
    );
    animation: shine 3s linear infinite;
}

@keyframes shine {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}

.champion-header h2 {
    font-size: 2.5em;
    margin-bottom: 10px;
    position: relative;
    z-index: 1;
    color: white !important;
}

.champion-header p {
    font-size: 1.2em;
    position: relative;
    z-index: 1;
    opacity: 0.9;
    color: white !important;
}

.trophy-icon {
    font-size: 2em;
    margin-bottom: 15px;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.xgboost-demo {
    background: linear-gradient(135deg, #fff7ed 0%, #fed7aa 100%);
    border: 2px solid #FF8C00;
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
    position: relative;
}

.xgboost-demo::before {
    content: "XGBoost Optimization Playground";
    position: absolute;
    top: -12px;
    left: 20px;
    background: #FF8C00;
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
}

.comparison-champion {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.method-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    border: 2px solid #e2e8f0;
    transition: all 0.3s ease;
    position: relative;
}

.method-card.winner {
    border-color: #FFD700;
    background: linear-gradient(135deg, rgba(255,215,0,0.1), rgba(255,140,0,0.1));
    transform: scale(1.02);
}

.method-card.winner::before {
    content: "👑";
    position: absolute;
    top: -10px;
    right: 15px;
    background: #FFD700;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
}

.method-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.method-card h4 {
    color: #2c3e50 !important;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.performance-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin: 15px 0;
}

.metric {
    text-align: center;
    padding: 0.75rem;
    background: #f8fafc;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
}

.metric-value {
    font-size: 1.3rem;
    font-weight: bold;
    color: #C73E1D;
}

.metric-value.winner {
    color: #FFD700;
}

.metric-label {
    font-size: 0.8rem;
    color: #64748b;
    margin-top: 5px;
}

.hyperparameter-playground {
    background: #f8fafc;
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
}

.parameter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.parameter-control {
    background: white;
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid #e2e8f0;
}

.parameter-control label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #374151;
}

.parameter-control input[type="range"] {
    width: 100%;
    margin: 0.5rem 0;
}

.control-value {
    display: inline-block;
    background: #FF8C00;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: bold;
    margin-left: 0.5rem;
}

.optimization-dashboard {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.dashboard-panel {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    border: 1px solid #e2e8f0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.dashboard-panel h4 {
    color: #2c3e50 !important;
    margin-bottom: 1rem;
}

.feature-importance-viz {
    height: 300px;
    margin: 1.5rem 0;
}

.real-world-showcase {
    background: linear-gradient(135deg, #e3f2fd 0%, #f3e5f5 100%);
    border: 2px solid #FF8C00;
    border-radius: 12px;
    padding: 2rem;
    margin: 2rem 0;
}

.success-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin: 1.5rem 0;
}

.stat-item {
    text-align: center;
    padding: 1rem;
    background: rgba(255,255,255,0.8);
    border-radius: 8px;
    border: 1px solid rgba(255,140,0,0.3);
}

.stat-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: #C73E1D;
}

.stat-label {
    font-size: 0.9rem;
    color: #666;
    margin-top: 5px;
}

.when-to-use {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin: 2rem 0;
}

.use-case-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.use-case-card.perfect-for {
    border-left: 4px solid #28a745;
}

.use-case-card.avoid-when {
    border-left: 4px solid #dc3545;
}

.use-case-card h4 {
    color: #2c3e50 !important;
    margin-bottom: 1rem;
}

.use-case-card.perfect-for h4 {
    color: #28a745 !important;
}

.use-case-card.avoid-when h4 {
    color: #dc3545 !important;
}

@media (max-width: 768px) {
    .comparison-champion {
        grid-template-columns: 1fr;
    }
    
    .optimization-dashboard {
        grid-template-columns: 1fr;
    }
    
    .parameter-grid {
        grid-template-columns: 1fr;
    }
    
    .when-to-use {
        grid-template-columns: 1fr;
    }
    
    .champion-header h2 {
        font-size: 2rem;
    }
}