:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --secondary: #9333ea;
    --accent: #10b981;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
}

.portal-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.portal-header {
    text-align: center;
    margin-bottom: 4rem;
}

.portal-title {
    font-size: 3.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
}

.portal-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    align-items: start;
}

.category-card {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 2.5rem 1.5rem;
    text-align: left;
    border: 1px solid var(--border);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    overflow: hidden;
    height: 100%;
}

.category-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(to right, var(--primary), var(--secondary));
    transform: scaleX(0);
    transition: transform 0.4s ease;
    transform-origin: left;
}

.category-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

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

.card-header {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.card-icon {
    font-size: 2.5rem;
    background: #f1f5f9;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    transition: all 0.4s ease;
    flex-shrink: 0;
}

.category-card:hover .card-icon {
    background: var(--primary);
    color: white;
}

.card-title {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.event-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

.event-list li {
    color: var(--text-muted);
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-left: 0.5rem;
    border-left: 2px solid transparent;
    transition: all 0.2s;
}

.category-card:hover .event-list li {
    border-left-color: var(--primary);
    color: var(--text-main);
    padding-left: 0.75rem;
}

.event-list li::before {
    content: '•';
    color: var(--primary);
    font-weight: bold;
}

.btn-arrow {
    margin-top: auto;
    font-weight: 600;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap 0.3s ease;
}

.category-card:hover .btn-arrow {
    gap: 0.8rem;
}

@media (max-width: 768px) {
    .portal-title {
        font-size: 2.25rem;
    }

    .category-grid {
        grid-template-columns: 1fr;
    }
}