:root {
    --primary: #6b7280;
    --primary-dark: #4b5563;
    --bg-light: #f9fafb;
    --border: #e5e7eb;
    --shadow: rgba(0, 0, 0, 0.05);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
    min-height: 100vh;
}

.loader {
    width: 40px;
    height: 40px;
    border: 2px solid #f3f4f6;
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
    margin: 40px auto;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.card-hover {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-hover:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
}

.status-badge {
    transition: all 0.2s ease;
    font-weight: 500;
    font-size: 0.6875rem;
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
}

.status-not-started {
    background-color: #f8fafc;
    color: #64748b;
    border: 1px solid #e2e8f0;
}

.status-in-progress {
    background-color: #fef9e7;
    color: #a16207;
    border: 1px solid #fde047;
}

.status-completed {
    background-color: #f0fdf4;
    color: #166534;
    border: 1px solid #86efac;
}

.course-completed {
    opacity: 0.7;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.course-completed .course-title {
    text-decoration: line-through;
    opacity: 0.6;
}

.details-panel {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.details-panel.expanded {
    max-height: 500px;
    opacity: 1;
}

.filter-btn {
    transition: all 0.2s ease;
    border-radius: 9999px;
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 500;
    border: 1px solid transparent;
}

.filter-btn:hover {
    transform: translateY(-1px);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 2px 8px 0 rgba(107, 114, 128, 0.3);
}

.search-input {
    transition: all 0.2s ease;
}

.search-input:focus {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px -2px rgba(0, 0, 0, 0.05);
}

.phase-header {
    background: linear-gradient(135deg, #ffffff 0%, #f9fafb 100%);
    border: 1px solid var(--border);
    border-radius: 0.75rem;
    padding: 1rem;
    margin-bottom: 1.5rem;
    position: relative;
    overflow: hidden;
}

.phase-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.progress-ring {
    transform: rotate(-90deg);
}

.progress-ring-circle {
    stroke-dasharray: 251.2;
    stroke-dashoffset: 251.2;
    transition: stroke-dashoffset 0.5s ease-in-out;
}

.area-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.625rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.area-hr { background: #f1f5f9; color: #475569; }
.area-tech { background: #f0f9ff; color: #0369a1; }
.area-fintech { background: #f0fdf4; color: #166534; }
.area-security { background: #fef2f2; color: #b91c1c; }
.area-compliance { background: #faf5ff; color: #7c3aed; }
.area-communication { background: #fff7ed; color: #c2410c; }

@media (max-width: 768px) {
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .filter-btn {
        text-align: center;
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(15px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.no-results {
    text-align: center;
    padding: 3rem 1rem;
    color: #9ca3af;
}

.no-results svg {
    margin: 0 auto 0.75rem;
    opacity: 0.5;
}