:root {
    --aqua: #01ebeb;
    --black: #000000;
    --bg-opacity: 0.7;
}

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

body {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, var(--aqua), var(--black));
    background-size: 300% 300%;
    animation: bgShift 12s ease infinite;
    color: #fff;
}

@keyframes bgShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 20px;
    text-shadow: 0 0 10px var(--aqua);
    letter-spacing: 1px;
}

.clock {
    padding: 30px 50px;
    background: rgba(0, 0, 0, var(--bg-opacity));
    border-radius: 20px;
    font-size: 64px;
    font-weight: bold;
    letter-spacing: 3px;
    text-align: center;
    box-shadow: 0 0 25px var(--aqua), inset 0 0 10px var(--black);
    text-shadow: 0 0 10px var(--aqua), 0 0 15px var(--aqua);
    animation: pulseGlow 4s infinite alternate;
    transition: all 0.3s ease-in-out;
}

@keyframes pulseGlow {
    0% {
    box-shadow: 0 0 20px var(--aqua), inset 0 0 10px var(--black);
    }
    100% {
    box-shadow: 0 0 35px var(--aqua), inset 0 0 15px var(--aqua);
    }
}

@media (max-width: 600px) {
    .clock {
    font-size: 36px;
    padding: 20px 30px;
    }
    .title {
    font-size: 20px;
    }
}