body {
    font-family: sans-serif;
    background-color: #f4f7f6;
}

.leaderboard-container {
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
}

.leaderboard-container h1 {
    text-align: center;
    color: #333;
    font-weight: 700;
    margin-bottom: 10px;
}

.leaderboard-container h1 .fa-trophy {
    color: #f1c40f;
}

.leaderboard-container .subtitle {
    text-align: center;
    color: #777;
    margin-bottom: 30px;
}

.leaderboard-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.rank-item {
    display: flex;
    align-items: center;
    padding: 15px;
    background-color: #fff;
    border-radius: 10px;
    border: 1px solid #eee;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.rank-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.rank-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: #888;
    width: 50px;
    text-align: center;
}

.rank-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    margin-left: 15px;
    margin-right: 20px;
    border: 2px solid #eee;
}

.rank-user {
    flex-grow: 1;
}

.rank-user .user-name {
    font-weight: 600;
    color: #333;
    margin: 0;
}

.rank-user .user-email {
    font-size: 0.85rem;
    color: #999;
    margin: 0;
}

.rank-score {
    font-size: 1.6rem;
    font-weight: 700;
    color: #512da8;
    display: flex;
    align-items: center;
    gap: 10px;
}

.rank-item:nth-child(1) {
    background: linear-gradient(135deg, #fffbeb, #fff);
    border-color: #f1c40f;
}
.rank-item:nth-child(2) {
    background: linear-gradient(135deg, #f8f9fa, #fff);
    border-color: #c0c0c0;
}
.rank-item:nth-child(3) {
    background: linear-gradient(135deg, #fff6f2, #fff);
    border-color: #cd7f32;
}

.rank-score .fa-medal {
    font-size: 2rem;
}

.rank-item:nth-child(1) .fa-medal { color: #f1c40f; }
.rank-item:nth-child(2) .fa-medal { color: #c0c0c0; }
.rank-item:nth-child(3) .fa-medal { color: #cd7f32; }

/* Loading Spinner */
.loading-spinner {
    border: 5px solid #f3f3f3;
    border-top: 5px solid #512da8;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 50px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hidden {
    display: none;
}