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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --bg-color: #ecf0f1;
    --text-color: #2c3e50;
    --card-bg: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 8px 12px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    max-width: 900px;
    width: 100%;
    background: var(--card-bg);
    border-radius: 20px;
    padding: 60px 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* Header */
header {
    text-align: center;
    margin-bottom: 60px;
}

header h1 {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 10px;
    letter-spacing: -1px;
}

.tagline {
    font-size: 1.2rem;
    color: #7f8c8d;
    font-weight: 300;
}

/* Main content */
main {
    margin-bottom: 40px;
}

.intro {
    text-align: center;
    margin-bottom: 50px;
}

.intro p {
    font-size: 1.1rem;
    color: #555;
}

/* Links section */
.links h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.link-card {
    background: var(--bg-color);
    padding: 30px 20px;
    border-radius: 12px;
    text-align: center;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    border: 2px solid transparent;
}

.link-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
    border-color: var(--secondary-color);
}

.link-card h3 {
    font-size: 1.3rem;
    margin-bottom: 8px;
    color: var(--secondary-color);
}

.link-card p {
    font-size: 0.9rem;
    color: #7f8c8d;
}

/* Footer */
footer {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid #ddd;
    color: #7f8c8d;
    font-size: 0.9rem;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 40px 30px;
    }

    header h1 {
        font-size: 2.2rem;
    }

    .tagline {
        font-size: 1rem;
    }

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

@media (max-width: 480px) {
    .container {
        padding: 30px 20px;
    }

    header h1 {
        font-size: 1.8rem;
    }
}