body {
    background-color: #ffffff;
    color: #000000;
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
}

.ctf-container {
    max-width: 1400px;
    /* increased width */
    margin: 30px auto;
    padding: 20px;
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
}

.page-heading {
    font-size: 36px;
    margin: 0;
    color: #222;
}

/* New flex container for header */
.ctf-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

/* "View Leaderboard" link stays same but no margin top now */
.leaderboard-link {
    padding: 12px 22px;
    background-color: royalblue;
    color: gold;
    text-decoration: none;
    border-radius: 6px;
    border: 2px solid #CD7F32;
    font-weight: bold;
    transition: background-color 0.2s ease, color 0.2s ease;
    white-space: nowrap;
}

.leaderboard-link:hover {
    background-color: #f6cd02;
    color: #fff;
}

/* Grid container */
.ctf-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    /* 3 columns */
    gap: 30px;
    justify-items: stretch;
    width: 100%;
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 10px;
}

/* Make card links block for full clickability */
.ctf-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
}

.ctf-card {
    background-color: #f9f9f9;
    border: 1px solid #ccc;
    border-radius: 10px;
    padding: 40px 30px;
    /* bigger padding for bigger cards */
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    text-align: left;
    width: 100%;
    box-sizing: border-box;
    min-height: 220px;
    /* bigger height */
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.ctf-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.12);
}

.ctf-card h3 {
    font-size: 28px;
    margin-bottom: 15px;
    color: #222;
}

.ctf-card p {
    font-size: 18px;
    margin: 8px 0;
    color: #333;
}

.no-ctf-message {
    text-align: center;
    font-size: 20px;
    color: gray;
    margin-top: 60px;
}

/* Dark mode styles (unchanged except margin bottom fix) */
body.dark-mode {
    background-color: #121212;
    color: #e0e0e0;
}

body.dark-mode .ctf-container {
    background-color: #121212;
}

body.dark-mode .page-heading {
    color: #e0e0e0;
}

body.dark-mode .ctf-card {
    background-color: #1f1f1f;
    border: 1px solid #333;
    box-shadow: 0 6px 15px rgba(255, 255, 255, 0.05);
}

body.dark-mode .ctf-card h3,
body.dark-mode .ctf-card p {
    color: #e0e0e0;
}

body.dark-mode .leaderboard-link {
    background-color: #3700b3;
    color: #f2f2f2;
    border-color: #bb86fc;
}

body.dark-mode .leaderboard-link:hover {
    background-color: #bb86fc;
    color: #121212;
}

body.dark-mode .no-ctf-message {
    color: #aaaaaa;
}

/* Responsive grid for smaller screens */
@media (max-width: 980px) {
    .ctf-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .ctf-grid {
        grid-template-columns: 1fr;
    }

    /* stack header elements vertically on small screens */
    .ctf-header {
        flex-direction: column;
        align-items: center;
        gap: 15px;
        margin-bottom: 30px;
    }
}