* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body, html {
    height: 100%;
    width: 100%;
    background-color: #000;
    color: #fff;
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    -webkit-tap-highlight-color: transparent;
}

#app {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    width: 100%;
    padding-top: 15vh;
}

#card-display {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    height: 70%;
    padding: 20px;
    padding-top: 0;
}

#card-number {
    font-size: 48px;
    font-weight: bold;
    text-align: center;
    word-break: break-all;
    letter-spacing: 4px;
}

#edit-container {
    display: flex;
    flex-direction: column;
    width: 80%;
    max-width: 400px;
    margin-bottom: 20px;
}

#card-input {
    padding: 15px;
    font-size: 18px;
    margin-bottom: 10px;
    border: none;
    border-radius: 5px;
}

#save-button {
    padding: 15px;
    background-color: #0066cc;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 18px;
    cursor: pointer;
}

#message {
    margin-top: 20px;
    color: #0f0;
    font-size: 16px;
    height: 20px;
}

/* 长按屏幕显示编辑界面 */
.editing #card-display {
    height: 30%;
}

.editing #edit-container {
    display: flex;
}

/* 默认隐藏编辑界面 */
#edit-container {
    display: none;
}