/* Basic styling */
:root {
    --bg-color: #000000;         /* Black background */
    --text-color: #ecf0f1;       /* Light text for readability */
    --card-bg: #1a1a1a;          /* Dark gray for link background */
    --link-highlight: #39FF14;   /* Lime green for hover and highlights */
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
    overflow-x: hidden; /* Prevent horizontal overflow on smaller screens */
    position: relative;
}

.container {
    text-align: center;
    width: 100%;
    max-width: 900px;
    position: relative;
    z-index: 1; /* Ensure content is on top of background animations */
}

header h1 {
    font-size: 5em;
    margin-bottom: 1em;
    color: var(--link-highlight);
    text-shadow: 0 0 15px var(--link-highlight);
    animation: pulse 4s infinite alternate;
}

header h2 {
    font-size: 3em;
    margin-top: -1em;
    margin-bottom: 1em;
    color: var(--link-highlight);
    text-shadow: 0 0 15px var(--link-highlight);
    animation: pulse 4s infinite alternate;
}

@keyframes pulse {
    from { text-shadow: 0 0 10px var(--link-highlight); }
    to { text-shadow: 0 0 25px var(--link-highlight), 0 0 50px var(--link-highlight); }
}

.links-grid {
    display: grid;
    /* This makes the grid flexible, showing as many columns as possible
       until the screen is too small, then stacking them. */
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.link-item {
    background-color: var(--card-bg);
    color: var(--text-color);
    text-decoration: none;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, background-color 0.3s ease;
    display: grid; /*Use grid for easier centering */
    place-items: center; /*Center content horizontally and vertically */
    min-height: 120px;
    text-align: center; /* Center text within the link item */
    flex-direction: column; /*Stack image and text */
}

.link-item:hover {
    transform: translateY(-5px);
    background-color: var(--link-highlight);
    color: var(--bg-color);
}

.link-icon {
    width: 64px; /* Adjust size as needed */
    height: auto;
    max-width: 100%;
    max-height: 100%;
    margin-bottom: 10px; /*Space between icon and text */
}

.link-text {
    font-size: 1.5em;
    font-weight: bold;
    /* Wrap text if it's too long for smaller screens */
    word-wrap: break-word;
}

/* Background decorations */
.stars {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(1px 1px at 20% 30%, var(--link-highlight), transparent),
        radial-gradient(1.5px 1.5px at 65% 80%, var(--link-highlight), transparent),
        radial-gradient(2px 2px at 80% 10%, var(--link-highlight), transparent),
        radial-gradient(1px 1px at 10% 90%, var(--link-highlight), transparent),
        radial-gradient(2.5px 2.5px at 50% 50%, var(--link-highlight), transparent),
        radial-gradient(1px 1px at 90% 40%, var(--link-highlight), transparent),
        radial-gradient(1.5px 1.5px at 35% 20%, var(--link-highlight), transparent);
    background-repeat: repeat;
    background-size: 150px 150px, 200px 200px, 250px 250px;
    animation: twinkling 25s infinite alternate, random-move 50s infinite linear;
    opacity: 1;
    filter: brightness(1.5) contrast(1.2);
}

@keyframes twinkling {
    0% { background-position: 0 0, 0 0, 0 0; opacity: 1; }
    50% { background-position: 200px 200px, -150px -150px, 100px 100px; opacity: 0.9; }
    100% { background-position: 400px 400px, -300px -300px, 200px 200px; opacity: 1; }
}

@keyframes random-move {
    0% { transform: translate(0, 0); }
    25% { transform: translate(-5%, 10%); }
    50% { transform: translate(5%, -15%); }
    75% { transform: translate(-10%, 5%); }
    100% { transform: translate(0, 0); }
}

.moon {
    position: absolute;
    top: 10%;
    right: 15%;
    width: 150px;
    height: 150px;
    background-color: #333333;
    border-radius: 50%;
    box-shadow: 0 0 40px 10px var(--link-highlight);
    animation: moon-pulse 5s infinite alternate;
}

@keyframes moon-pulse {
    0% { transform: scale(1); box-shadow: 0 0 40px 10px var(--link-highlight); }
    100% { transform: scale(1.05); box-shadow: 0 0 60px 15px var(--link-highlight); }
}

/* ============================
   Responsive adjustments
   ============================ */

/*
  This media query targets tablet-sized screens.
  It reduces the heading size and repositions the moon slightly
  to prevent overlap on medium-sized viewports.
*/
@media (max-width: 900px) {
    header h1 {
        font-size: 4em;
    }

    header h2 {
        font-size: 2.5em;
    }

    .moon {
        width: 120px;
        height: 120px;
        top: 8%;
        right: 12%;
    }

    .link-text {
        font-size: 1.2em; /* Smaller font size for link text */
    }
}

/*
  This media query targets mobile-sized screens.
  It makes the link grid a single column, further reduces text sizes,
  and adjusts the moon for optimal display on small devices.
*/
@media (max-width: 600px) {
    body {
        padding: 10px;
    }

    header h1 {
        font-size: 2.5em; /* Smaller heading for phones */
        margin-bottom: 0.5em;
    }

    header h2 {
        font-size: 1em; /* Smaller heading for phones */
        margin-bottom: 0.5em;
    }
    
    .links-grid {
        grid-template-columns: 1fr; /* Single column layout for phones */
        gap: 15px; /* Reduce gap between links */
    }

    .link-item {
        min-height: 80px; /* Smaller button height on phones */
        padding: 15px;
    }

    .link-text {
        font-size: 1.1em; /* Further reduced font size for legibility */
    }

    .moon {
        width: 60px;
        height: 60px;
        top: 5%;
        right: 5%;
        box-shadow: 0 0 20px 5px var(--link-highlight); /* Smaller glow */
    }

    @keyframes moon-pulse {
        0% { transform: scale(1); box-shadow: 0 0 20px 5px var(--link-highlight); }
        100% { transform: scale(1.05); box-shadow: 0 0 30px 8px var(--link-highlight); }
    }
}