.coin-choice {
    display: flex;
    gap: 80px;
    margin-top: 25px;
    justify-content: center;
    align-items: flex-start;
}

.coin-option {
    text-align: center;
    cursor: pointer;
    position: relative;
    width: 240px;
}

/* Hide radio button completely from layout */
.coin-option input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.coin-card {
    position: relative;
    display: flex;
    justify-content: center;
}

.coin-card img {
    border: 5px solid transparent;
    border-radius: 50%;
    transition: all 0.25s ease;
}

/* Hover */
.coin-option:hover img {
    transform: scale(1.06);
}

/* Selected highlight */
.coin-option input[type="radio"]:checked + .coin-card img {
    border: 6px solid #28a745;
    box-shadow: 0 0 25px rgba(40, 167, 69, 0.7);
    transform: scale(1.1);
}

/* Checkmark */
.checkmark {
    position: absolute;
    top: 10px;
    right: 10px;
    background: #28a745;
    color: white;
    font-size: 24px;
    font-weight: bold;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.6);
    transition: all 0.2s ease;
}

.coin-option input[type="radio"]:checked + .coin-card .checkmark {
    opacity: 1;
    transform: scale(1);
}

.coin-label {
    margin-top: 12px;
    font-weight: 600;
    font-size: 18px;
    display: flex;
    align-items: center;      /* vertical center */
    justify-content: center;  /* horizontal center */
}
/* Increase overall text size */
body {
    font-size: 18px;   /* try 18–20px */
    line-height: 1.6;
}

/* Paragraphs */
p {
    font-size: 1.05em;
}

/* Form labels */
.otree-form label {
    font-size: 1.1em;
}

/* Radio / checkbox text */
.otree-form .controls {
    font-size: 1.1em;
}

/* Buttons */
.btn {
    font-size: 1.1em;
    padding: 10px 18px;
}

/* Confetti */

#confetti-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 9999;
}

.confetti {
    position: absolute;
    top: -10px;
    width: 10px;
    height: 14px;
    opacity: 0.9;
    animation: fall 4s linear forwards;
}

@keyframes fall {
    0% {
        transform: translateY(0) rotate(0deg);
    }
    100% {
        transform: translateY(100vh) rotate(720deg);
    }
}