:root {
    --bg-color: #121212;
    --text-color: #ffffff;
    --clock-border-color: #888;
    --am-bg-color: #34495e;
    --pm-bg-color: #1a2531;
    --hour-hand-color: #ffffff;
    --minute-hand-color: #ffffff;
    --second-hand-color: #e74c3c;
    --center-dot-color: #ffffff;
    --tick-color: #cccccc;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
}

.clock-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px 60px;
    justify-items: center;
    width: 100%;
    max-width: 900px;
}

.clock-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.utc-wrapper {
    grid-column: 1 / -1; /* Span all columns */
    justify-self: center;
}

.clock {
    width: 180px;
    height: 180px;
    border: 4px solid var(--clock-border-color);
    border-radius: 50%;
    position: relative;
    transition: background-color 0.5s ease;
}

.tick {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 2px;
    height: 10px;
    background-color: var(--tick-color);
    transform-origin: 50% 0;
}

.clock .tick:nth-child(5) { transform: translate(-50%, -50%) rotate(0deg) translateY(-80px); width: 4px; height: 15px;}
.clock .tick:nth-child(6) { transform: translate(-50%, -50%) rotate(30deg) translateY(-80px); }
.clock .tick:nth-child(7) { transform: translate(-50%, -50%) rotate(60deg) translateY(-80px); }
.clock .tick:nth-child(8) { transform: translate(-50%, -50%) rotate(90deg) translateY(-80px); width: 4px; height: 15px;}
.clock .tick:nth-child(9) { transform: translate(-50%, -50%) rotate(120deg) translateY(-80px); }
.clock .tick:nth-child(10) { transform: translate(-50%, -50%) rotate(150deg) translateY(-80px); }
.clock .tick:nth-child(11) { transform: translate(-50%, -50%) rotate(180deg) translateY(-80px); width: 4px; height: 15px;}
.clock .tick:nth-child(12) { transform: translate(-50%, -50%) rotate(210deg) translateY(-80px); }
.clock .tick:nth-child(13) { transform: translate(-50%, -50%) rotate(240deg) translateY(-80px); }
.clock .tick:nth-child(14) { transform: translate(-50%, -50%) rotate(270deg) translateY(-80px); width: 4px; height: 15px;}
.clock .tick:nth-child(15) { transform: translate(-50%, -50%) rotate(300deg) translateY(-80px); }
.clock .tick:nth-child(16) { transform: translate(-50%, -50%) rotate(330deg) translateY(-80px); }


.clock.am {
    background-color: var(--am-bg-color);
}

.clock.pm {
    background-color: var(--pm-bg-color);
}

.city-name {
    margin-top: 15px;
    font-size: 1.2em;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.city-name .dst {
    color: #e74c3c;
    margin-left: 5px;
}

.center-dot {
    width: 10px;
    height: 10px;
    background-color: var(--center-dot-color);
    border-radius: 50%;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 10;
}

.hand {
    --rotation: 0;
    position: absolute;
    bottom: 50%;
    left: 50%;
    transform-origin: bottom;
    transform: translateX(-50%) rotate(calc(var(--rotation) * 1deg));
    border-radius: 4px;
}

.hour-hand {
    width: 5px;
    height: 50px;
    background-color: var(--hour-hand-color);
}

.minute-hand {
    width: 3px;
    height: 70px;
    background-color: var(--minute-hand-color);
}

.second-hand {
    width: 2px;
    height: 80px;
    background-color: var(--second-hand-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .clock-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px 40px;
    }
    .utc-wrapper {
        grid-column: 1 / -1;
    }
    .clock {
        width: 150px;
        height: 150px;
    }
    .clock .tick:nth-child(5) { transform: translate(-50%, -50%) rotate(0deg) translateY(-65px); width: 3px; height: 12px;}
    .clock .tick:nth-child(6) { transform: translate(-50%, -50%) rotate(30deg) translateY(-65px); }
    .clock .tick:nth-child(7) { transform: translate(-50%, -50%) rotate(60deg) translateY(-65px); }
    .clock .tick:nth-child(8) { transform: translate(-50%, -50%) rotate(90deg) translateY(-65px); width: 3px; height: 12px;}
    .clock .tick:nth-child(9) { transform: translate(-50%, -50%) rotate(120deg) translateY(-65px); }
    .clock .tick:nth-child(10) { transform: translate(-50%, -50%) rotate(150deg) translateY(-65px); }
    .clock .tick:nth-child(11) { transform: translate(-50%, -50%) rotate(180deg) translateY(-65px); width: 3px; height: 12px;}
    .clock .tick:nth-child(12) { transform: translate(-50%, -50%) rotate(210deg) translateY(-65px); }
    .clock .tick:nth-child(13) { transform: translate(-50%, -50%) rotate(240deg) translateY(-65px); }
    .clock .tick:nth-child(14) { transform: translate(-50%, -50%) rotate(270deg) translateY(-65px); width: 3px; height: 12px;}
    .clock .tick:nth-child(15) { transform: translate(-50%, -50%) rotate(300deg) translateY(-65px); }
    .clock .tick:nth-child(16) { transform: translate(-50%, -50%) rotate(330deg) translateY(-65px); }

    .hour-hand { height: 40px; }
    .minute-hand { height: 60px; }
    .second-hand { height: 65px; }
}

@media (max-width: 480px) {
    .clock-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .utc-wrapper {
        grid-column: auto;
    }
    .clock {
        width: 200px;
        height: 200px;
    }
    .clock .tick:nth-child(5) { transform: translate(-50%, -50%) rotate(0deg) translateY(-90px); width: 4px; height: 15px;}
    .clock .tick:nth-child(6) { transform: translate(-50%, -50%) rotate(30deg) translateY(-90px); }
    .clock .tick:nth-child(7) { transform: translate(-50%, -50%) rotate(60deg) translateY(-90px); }
    .clock .tick:nth-child(8) { transform: translate(-50%, -50%) rotate(90deg) translateY(-90px); width: 4px; height: 15px;}
    .clock .tick:nth-child(9) { transform: translate(-50%, -50%) rotate(120deg) translateY(-90px); }
    .clock .tick:nth-child(10) { transform: translate(-50%, -50%) rotate(150deg) translateY(-90px); }
    .clock .tick:nth-child(11) { transform: translate(-50%, -50%) rotate(180deg) translateY(-90px); width: 4px; height: 15px;}
    .clock .tick:nth-child(12) { transform: translate(-50%, -50%) rotate(210deg) translateY(-90px); }
    .clock .tick:nth-child(13) { transform: translate(-50%, -50%) rotate(240deg) translateY(-90px); }
    .clock .tick:nth-child(14) { transform: translate(-50%, -50%) rotate(270deg) translateY(-90px); width: 4px; height: 15px;}
    .clock .tick:nth-child(15) { transform: translate(-50%, -50%) rotate(300deg) translateY(-90px); }
    .clock .tick:nth-child(16) { transform: translate(-50%, -50%) rotate(330deg) translateY(-90px); }

    .hour-hand { height: 55px; }
    .minute-hand { height: 80px; }
    .second-hand { height: 90px; }
    .city-name {
        font-size: 1.3em;
    }
}