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

html {
    background: #ffffff;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    color: #000000;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    text-align: center;
}

.clock-wrapper {
    padding: 40px;
}

.clock-content {
    position: relative;
}

.time-display {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 9rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    color: #000000;
    margin-bottom: 24px;
}

.period {
    font-size: 2.2rem;
    font-weight: 400;
    color: #666666;
    margin-bottom: 36px;
}

.date-display {
    font-size: 1.6rem;
    font-weight: 400;
    color: #333333;
    margin-bottom: 12px;
}

.day-display {
    font-size: 1.3rem;
    font-weight: 400;
    color: #666666;
}

/* Responsive Design */
@media (max-width: 768px) {
    .time-display {
        font-size: 2rem;
    }

    .period {
        font-size: 0.7rem;
    }

    .date-display {
        font-size: 0.55rem;
    }

    .day-display {
        font-size: 0.5rem;
    }
}

@media (max-width: 480px) {
    .time-display {
        font-size: 1.5rem;
    }

    .period {
        font-size: 0.6rem;
        margin-bottom: 16px;
    }

    .date-display {
        font-size: 0.5rem;
    }

    .day-display {
        font-size: 0.45rem;
    }
}