Fragmento de cargador animado CSS

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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Modern Animated Loader</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

body {
            background-color: #0a0a0a;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            overflow: hidden;
            font-family: 'Segoe UI', sans-serif;
        }

.loader-wrapper {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2rem;
        }

/* The Spinner */
        .spinner {
            position: relative;
            width: 120px;
            height: 120px;
        }

.spinner span {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            border: 4px solid transparent;
            border-radius: 50%;
        }

.spinner span:nth-child(1) {
            border-top-color: #00d2ff;
            animation: rotate 2s linear infinite;
        }

.spinner span:nth-child(2) {
            width: 80%;
            height: 80%;
            top: 10%;
            left: 10%;
            border-bottom-color: #3a7bd5;
            animation: rotate-reverse 1.5s linear infinite;
        }

.spinner span:nth-child(3) {
            width: 60%;
            height: 60%;
            top: 20%;
            left: 20%;
            border-right-color: #00d2ff;
            animation: rotate 1s linear infinite;
        }

/* Loading Text */
        .text {
            color: #ffffff;
            font-size: 14px;
            font-weight: 300;
            letter-spacing: 5px;
            text-transform: uppercase;
            animation: fade 2s ease-in-out infinite;
        }

/* Glow Effect */
        .glow {
            position: absolute;
            width: 100%;
            height: 100%;
            border-radius: 50%;
            box-shadow: 0 0 20px rgba(0, 210, 255, 0.2);
        }

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

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

@keyframes fade {
            0%, 100% { opacity: 0.3; transform: scale(0.95); }
            50% { opacity: 1; transform: scale(1); }
        }
    </style>
</head>
<body>

<div class="loader-wrapper">
        <div class="spinner">
            <div class="glow"></div>
            <span></span>
            <span></span>
            <span></span>
        </div>
        <div class="text">Loading</div>
    </div>

</body>
</html>

CSS