* {
    box-sizing: border-box;
}

:root {
    --bg-color: #B58863;
    --box-bg: #F0D9B5;
    --accent-color: #81b64c;
    --text-color: black;
    --text-secondary: #3a3a3a;
    --border-radius: 8px;
    --transition: all 0.2s ease;
}

body {
    margin: 0;
    font-family: 'Microsoft JhengHei', 'PingFang TC', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh
}

.homepage {
    background-color: var(--box-bg);
    padding: 40px;
    border-radius: 12px;
    width: 100%;
    max-width: 400px;
    text-align: center;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
}

h1 {
    color: green;
    margin-bottom: 30px;
}

.input-box {
    margin-bottom: 20px;
    text-align: left;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: gray;
}

input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 2px solid black;
    border-radius: 6px;
    transition: border-color 0.3s;
    font-size: 16px;
}

input[type="text"]:focus {
    border-color: blue;
    outline: none;
}

.start-button {
    width: 100%;
    padding: 15px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 18px;
    font-weight: bold;
    margin-top: 20px;
    transition: background-color 0.3s, opacity 0.3s;
}

.start-button:hover:not(:disabled) {
    background-color: #6da040;
    transform: translateY(-2px);
}

.start-button:disabled {
    background-color: gray;
    cursor: not-allowed;
    opacity: 0.6;
}