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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: #0d0d0d;
    color: #f0f0f0;
    padding: 40px;
}

h1 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2.8rem;
    font-weight: 700;
    color: #00ffff;
    border: 1px solid #ff0000;
    border-radius: 10px;
    background-color: #2c2c2c69;
}

body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        radial-gradient(circle at 25% 25%, #5500ff 0%, transparent 40%),
        radial-gradient(circle at 75% 25%, #ff007f 0%, transparent 40%),
        radial-gradient(circle at 50% 75%, #00e5ff 0%, transparent 40%);
    filter: blur(100px);
    z-index: -1;
    animation: aurora 15s linear infinite;
}


.div-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    width: 100%;
}

.border-card {
    background-color: #2c2c2c;
    border-radius: 15px;
    padding: 25px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    border: 1px solid #ff0000;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.border-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.border-card h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: #4ee4e4;
    border-bottom: 1px solid #5500ff;
    padding-bottom: 10px;
}

.border-preview {
    width: 150px;
    height: 150px;
    border: 1px solid #ff0000;
    background-color: #5500ff;
}

.border-1 {
    border-radius: 0;
}
.border-2 {
    border-radius: 20px;
}
.border-3 {
    border-radius: 50%;
}
.border-4 {
    border-radius: 25% 10%;
}
.border-5 {
    border-radius: 10% 30% 50% 70%;
}
.border-6 {
    border-radius: 50px 0;
}
.border-7 {
    border-radius: 10% /50%;
}
.border-8 {
    border-top-left-radius: 30px;
}
.border-9 {
    border-top-right-radius: 50%;
}
.border-10 {
    border-bottom-right-radius: 100%;
}
.border-11 {
    border-bottom-left-radius: 50% 20%;
}
.border-12 {
    border-radius: 0 50% 50% 50%;
}

code {
    font-family: 'Fira Code', 'Courier New', Courier, monospace;
    background-color: #1e1e1e;
    color: #4ee4e4;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #ff0000;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-size: 0.9rem;
    line-height: 1.5;
}

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