/* Reset e base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #ffffff;
    color: #333333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 60px 20px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.3rem;
    font-weight: 500;
    margin-bottom: 8px;
    opacity: 0.95;
}

.description {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Main content */
main {
    padding: 60px 20px;
    min-height: 60vh;
}

/* Cards grid */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
    margin-top: 20px;
}

/* Card styling */
.card {
    background: #ffffff;
    border: 1px solid #e5e7eb;
    border-radius: 12px;
    padding: 24px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    min-height: 180px;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.12);
    border-color: #667eea;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: #1f2937;
    margin-bottom: 12px;
}

.card-description {
    font-size: 0.95rem;
    color: #6b7280;
    margin-bottom: 20px;
    flex-grow: 1;
}

.card-button {
    display: inline-block;
    background: #667eea;
    color: white;
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-weight: 500;
    text-align: center;
    transition: background 0.3s ease;
}

.card-button:hover {
    background: #5568d3;
}

/* Footer */
footer {
    background-color: #f9fafb;
    border-top: 1px solid #e5e7eb;
    padding: 30px 20px;
    text-align: center;
    color: #6b7280;
    font-size: 0.9rem;
}

/* Responsive design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .description {
        font-size: 1rem;
    }

    .cards-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    main {
        padding: 40px 20px;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1025px) {
    .cards-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}