/* Reset & fonts */
body, html {
    margin: 0;
    padding: 0;
    font-family: 'Roboto', sans-serif;
    height: 100%;
    overflow: hidden;
    background: linear-gradient(to bottom, #0f2027, #203a43, #2c5364);
    color: #fff;
    position: relative;
}

canvas#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

header {
    text-align: center;
    padding: 50px 20px 30px 20px;
    position: relative;
    z-index: 1;
}

header h1 {
    font-size: 3rem;
    margin: 0;
}

header p {
    font-size: 1.2rem;
    color: #ccc;
    margin-top: 10px;
}

main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 1;
    height: calc(100% - 180px); /* leave space for header/footer */
}

.button-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 25px;
    width: 90%;
    max-width: 1000px;
}

.hub-button {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 25px;
    background-color: rgba(255,255,255,0.1);
    color: #fff;
    font-size: 1.2rem;
    text-decoration: none;
    border-radius: 15px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    backdrop-filter: blur(5px);
    text-align: center;
}

.hub-button:hover {
    background-color: rgba(255,255,255,0.2);
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 10px 20px rgba(0,0,0,0.5);
}

footer {
    text-align: center;
    padding: 20px;
    color: #aaa;
    font-size: 0.9rem;
    position: relative;
    z-index: 1;
}

#info-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 45px;

    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.08);

    display: flex;
    justify-content: space-around;
    align-items: center;

    font-family: 'Roboto', sans-serif;
    font-size: 14px;
    color: white;

    border-top: 1px solid rgba(255, 255, 255, 0.15);
    z-index: 9999;
}