* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-family: Arial, sans-serif;
    background: #f1f5f9;
}

.card {
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 30px;
    text-align: center;
}
h1 {
    font-size: 42px;
    margin-bottom: 20px;
}

h2 {
    font-size: 28px;
    margin-bottom: 20px;
}

input {
    width: 90%;
    max-width: 500px;
    height: 65px;
    padding: 15px;
    border: 2px solid #ccc;
    border-radius: 10px;
    font-size: 20px;
    text-align: center;
}

button {
    width: 90%;
    max-width: 500px;
    height: 65px;
    margin-top: 20px;
    border: none;
    border-radius: 10px;
    background: red;
    color: white;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
}

.background-images {
    position: fixed;
    inset: 0;
    display: flex;
    z-index: -1;
    overflow: hidden;
}

.background-images img {
    width: 33.33%;
    height: 100%;
    object-fit: cover;
    opacity: 0.15;
}

.notice {
    margin-top: 25px;
    font-size: 13px;
}

.reward-image {
    width: 200px;
    height: auto;
    display: block;
    margin: 15px auto;
}

.share-progress {
    width: 90%;
    max-width: 500px;
    margin-top: 20px;
}

.progress-bar {
    width: 100%;
    height: 18px;
    background: #ddd;
    border-radius: 20px;
    overflow: hidden;
}

#progressFill {
    width: 0%;
    height: 100%;
    background: red;
    transition: width 0.3s;
}

#shareCount {
    font-weight: bold;
    margin-top: 8px;
}

#claimButton {
    background: white;
    color: #555;
    border: 2px solid #ccc;
    cursor: not-allowed;
}

#claimButton.unlocked {
    background: red;
    color: white;
    cursor: pointer;
}

#shareButton.disabled {
    background: white;
    color: #999;
    border: 2px solid #ddd;
    cursor: not-allowed;
}