* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
body {
    min-height: 100vh;
    font-family: Arial, sans-serif;
    background: #1a1a2e;
    color: #e0e0e0;
}
header {
    background: #16213e;
    padding: 1.2rem 2rem;
    border-bottom: 2px solid #00d4aa;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.site-title {
    font-size: 1.4rem;
    color: #00d4aa;
    font-weight: bold;
    text-decoration: none;
}
nav a {
    color: #e0e0e0;
    text-decoration: none;
    margin-left: 1.2rem;
    padding: 0.4rem 1rem;
    border-radius: 4px;
    transition: background 0.2s;
    display: inline-block;
}
nav a:hover {
    background: rgba(0, 212, 170, 0.2);
}
main {
    max-width: 960px;
    margin: 0 auto;
    padding: 3rem 2rem;
}
.hero {
    text-align: center;
    margin-bottom: 2.5rem;
}
.hero h1 {
    font-size: 3rem;
    color: #00d4aa;
    margin-bottom: 0.8rem;
}
.hero p {
    font-size: 1.2rem;
    opacity: 0.8;
}
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}
.card {
    background: #16213e;
    border: 1px solid rgba(0, 212, 170, 0.25);
    border-radius: 8px;
    padding: 1.5rem;
}
.card h2 {
    color: #00d4aa;
    font-size: 1.15rem;
    margin-bottom: 0.8rem;
}
.card p {
    font-size: 0.95rem;
    line-height: 1.6;
    opacity: 0.8;
}