:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --text-color: #ecf0f1;
    --bg-color: #2c3e50;
    --clock-bg: rgba(0, 0, 0, 0.7);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    transition: background 0.5s ease;
    overflow: hidden;
}

#particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.container {
    position: relative;
    z-index: 10;
    width: 90%;
    max-width: 600px;
    padding: 2rem;
    background: var(--clock-bg);
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    text-align: center;
    backdrop-filter: blur(10px);
}

.clock #time {
    font-size: 4rem;
    font-weight: 300;
    margin-bottom: 0.5rem;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.clock #date {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    opacity: 0.85;
}

.clock #timezone {
    font-size: 0.9rem;
    padding: 0.3rem 0.8rem;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    display: inline-block;
    margin-bottom: 1.2rem;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-top: 1rem;
}

.control-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--text-color);
    padding: 0.6rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.3s ease, transform 0.2s ease;
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-2px);
}

/* Responsive */
@media (max-width: 600px) {
    .clock #time {
        font-size: 3rem;
    }

    .control-btn {
        font-size: 0.85rem;
        padding: 0.5rem 0.8rem;
    }
}