:root {
    --primary-color: #2563eb;
    --success-color: #16a34a;
    --danger-color: #dc2626;
    --warning-color: #f59e0b;
}

body {
    background-color: #f8fafc;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.main-content {
    padding-top: 70px;
}

.navbar-brand {
    font-size: 1.4rem;
}

.card {
    border: none;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border-radius: 12px;
}

.card-header {
    background: transparent;
    border-bottom: 1px solid #e5e7eb;
    font-weight: 600;
}

.stat-card {
    text-align: center;
    padding: 1.5rem;
}

.stat-card .stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-card .stat-label {
    color: #64748b;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

.btn-success {
    background-color: var(--success-color);
    border-color: var(--success-color);
}

.badge-win {
    background-color: var(--success-color);
    color: white;
}

.badge-loss {
    background-color: var(--danger-color);
    color: white;
}

.belt-white { background-color: #f1f5f9; color: #1e293b; }
.belt-grey { background-color: #94a3b8; color: white; }
.belt-yellow { background-color: #fbbf24; color: #1e293b; }
.belt-orange { background-color: #f97316; color: white; }
.belt-green { background-color: #22c55e; color: white; }
.belt-blue { background-color: #3b82f6; color: white; }
.belt-purple { background-color: #8b5cf6; color: white; }
.belt-brown { background-color: #78350f; color: white; }
.belt-black { background-color: #1e293b; color: white; }

.match-card {
    border-left: 4px solid transparent;
    margin-bottom: 0.75rem;
}

.match-card.win {
    border-left-color: var(--success-color);
}

.match-card.loss {
    border-left-color: var(--danger-color);
}

.quick-action-btn {
    padding: 1rem;
    font-size: 1.1rem;
    border-radius: 12px;
    margin-bottom: 0.5rem;
}

.form-control, .form-select {
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 1rem;
}

.form-control:focus, .form-select:focus {
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
    border-color: var(--primary-color);
}

.athlete-card {
    transition: transform 0.2s;
    cursor: pointer;
}

.athlete-card:hover {
    transform: translateY(-2px);
}

.progress-ring {
    width: 80px;
    height: 80px;
}

.chart-container {
    position: relative;
    height: 250px;
}

@media (max-width: 768px) {
    .stat-card .stat-value {
        font-size: 2rem;
    }
    
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .table-responsive {
        font-size: 0.875rem;
    }
    
    .btn {
        padding: 0.75rem 1rem;
    }
}

.login-container {
    max-width: 400px;
    margin: 80px auto;
}

.login-card {
    padding: 2rem;
}

.match-form-container {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.result-btn {
    width: 100%;
    padding: 1.5rem;
    font-size: 1.2rem;
    font-weight: 600;
    border-radius: 12px;
    margin-bottom: 0.5rem;
}

.result-btn.win {
    background-color: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.result-btn.loss {
    background-color: var(--danger-color);
    border-color: var(--danger-color);
    color: white;
}

.result-btn:hover {
    opacity: 0.9;
}

.method-btn {
    padding: 1rem;
    border-radius: 8px;
    border: 2px solid #e5e7eb;
    background: white;
    width: 100%;
    margin-bottom: 0.5rem;
    transition: all 0.2s;
}

.method-btn:hover, .method-btn.active {
    border-color: var(--primary-color);
    background-color: #eff6ff;
}

.insight-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 12px;
    padding: 1.5rem;
}

.insight-card h5 {
    opacity: 0.9;
    font-size: 0.875rem;
    text-transform: uppercase;
}

.insight-card .value {
    font-size: 2rem;
    font-weight: 700;
}