body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

#particles-js {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 1;
}

.container {
    max-width: 800px;
    padding: 2rem;
    position: relative;
    z-index: 2;
}

.card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    border: none;
    padding: 2rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: translateX(-100%);
    transition: 0.5s;
}

.card:hover::before {
    transform: translateX(100%);
}

.card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.hello-world {
    font-size: 3.5rem;
    font-weight: 700;
    background: linear-gradient(45deg, #2193b0, #6dd5ed);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
    margin-bottom: 2rem;
    animation: fadeIn 1s ease-in;
    position: relative;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.hello-world::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: linear-gradient(45deg, #2193b0, #6dd5ed);
    border-radius: 3px;
}

.countdown {
    font-size: 1.2rem;
    color: #2c3e50;
    text-align: center;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    animation: slideUp 0.5s ease-out;
    position: relative;
    overflow: hidden;
}

.countdown::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.8) 0%, transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.countdown:hover::before {
    opacity: 1;
}

.countdown-number {
    font-weight: 600;
    color: #2193b0;
    padding: 0.2rem 0.5rem;
    background: rgba(33, 147, 176, 0.1);
    border-radius: 8px;
    margin: 0 0.2rem;
    transition: all 0.3s ease;
    display: inline-block;
}

.countdown-number:hover {
    transform: scale(1.1);
    background: rgba(33, 147, 176, 0.2);
}

@keyframes fadeIn {
    from { 
        opacity: 0;
        transform: translateY(-20px);
    }
    to { 
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.gradient-border {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
}

.gradient-border::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, #2193b0, #6dd5ed);
    z-index: -1;
    border-radius: 22px;
    animation: borderRotate 4s linear infinite;
}

@keyframes borderRotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.glow {
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from {
        box-shadow: 0 0 5px #fff,
                   0 0 10px #fff,
                   0 0 15px #2193b0,
                   0 0 20px #2193b0;
    }
    to {
        box-shadow: 0 0 10px #fff,
                   0 0 20px #fff,
                   0 0 30px #6dd5ed,
                   0 0 40px #6dd5ed;
    }
}