body {
    display: flex;
    flex-direction: column; 
    justify-content: space-between; 
    align-items: center;
    min-height: 100vh; 
    margin: 0;
    background-color: #111;
    color: #fff;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    text-align: center;
}

.container {
    padding: 20px;
    flex-grow: 1; 
    display: flex;
    flex-direction: column;
    justify-content: center; 
    align-items: center;
    width: 100%;
}

.time-display {
    /* 💥 核心修复：确保 font-size 是 8rem */
    font-size: 8rem; 
    font-weight: 300;
    letter-spacing: -3px;
    white-space: nowrap; 
}

.info-line {
    font-size: 1.5rem;
    margin-top: 10px;
}

.accuracy-note {
    margin-top: 50px;
    font-size: 0.8rem;
    color: #aaa;
}

footer {
    width: 100%;
    padding: 10px 0;
    font-size: 0.8rem;
    color: #aaa;
    display: flex;
    justify-content: center;
}

footer a {
    color: #88f; 
    text-decoration: none; 
}

footer a:hover {
    text-decoration: underline; 
}