Formulário de login HTML com estilo CSS neon

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>System Login</title>
    <style>
        :root {
            --neon-primary: #00ffff; /* Cyan */
            --neon-secondary: #ff00ff; /* Magenta */
            --dark-bg: #020216;
            --mid-bg: #05052a;
            --font-stack: 'Consolas', 'Monospace', sans-serif;
        }

body {
            background-color: var(--dark-bg);
            color: var(--neon-primary);
            font-family: var(--font-stack);
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
            overflow: hidden;
            letter-spacing: 1.5px;
        }

/* Subtle background grid effect */
        body::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: 
                linear-gradient(0deg, transparent 98%, rgba(0, 255, 255, 0.1) 100%),
                linear-gradient(90deg, transparent 98%, rgba(0, 255, 255, 0.1) 100%);
            background-size: 40px 40px;
            opacity: 0.3;
            pointer-events: none;
        }

.login-container {
            width: 380px;
            padding: 40px;
            background-color: var(--mid-bg);
            border: 2px solid var(--neon-primary);
            box-shadow: 
                0 0 15px var(--neon-primary), 
                0 0 30px rgba(0, 255, 255, 0.5);
            transition: all 0.5s ease;
            position: relative;
            z-index: 10;
        }
        
        .system-title {
            text-align: center;
            font-size: 1.5em;
            margin-bottom: 30px;
            text-shadow: 0 0 10px var(--neon-primary);
            color: var(--neon-primary);
            border-bottom: 1px solid rgba(0, 255, 255, 0.5);
            padding-bottom: 10px;
        }

.input-group {
            margin-bottom: 20px;
        }

label {
            display: block;
            margin-bottom: 8px;
            font-size: 0.9em;
            color: var(--neon-secondary);
            text-shadow: 0 0 5px rgba(255, 0, 255, 0.5);
        }

input {
            width: calc(100% - 20px);
            padding: 10px;
            background: rgba(0, 0, 0, 0.4);
            border: 1px solid var(--neon-primary);
            color: white;
            font-size: 1em;
            outline: none;
            box-shadow: inset 0 0 5px rgba(0, 255, 255, 0.3);
            transition: border 0.3s, box-shadow 0.3s;
        }

input:focus {
            border: 1px solid var(--neon-secondary);
            box-shadow: 0 0 15px var(--neon-secondary), inset 0 0 8px var(--neon-secondary);
        }

.login-button {
            width: 100%;
            padding: 15px;
            margin-top: 25px;
            background: var(--neon-primary);
            color: var(--dark-bg);
            border: none;
            cursor: pointer;
            font-weight: bold;
            text-transform: uppercase;
            font-size: 1.1em;
            box-shadow: 0 0 20px var(--neon-primary);
            transition: background 0.3s, box-shadow 0.3s;
        }

.login-button:hover {
            background: #99ffff;
            box-shadow: 0 0 30px #99ffff;
        }

.status-message {
            text-align: center;
            margin-top: 30px;
            font-size: 0.8em;
            color: var(--neon-secondary);
            text-shadow: 0 0 5px var(--neon-secondary);
            animation: blink 1.5s infinite alternate;
        }
        
        @keyframes blink {
            from { opacity: 0.7; }
            to { opacity: 1; }
        }
    </style>
</head>
<body>

<div class="login-container">
        <div class="system-title">
            ACCESS_FUTUR
        </div>
        <form class="login-form">
            <div class="input-group">
              <label for="id_matrix">Mail / Users:</label>
                <input type="text" id="id_matrix" required placeholder="Enter designation code">
            </div>
            <div class="input-group">
                <label for="auth_key">Password:</label>
                <input type="password" id="auth_key" required placeholder="Enter secure key">
            </div>
            <button type="submit" class="login-button">
                Log in
            </button>
            <div class="status-message">
                // SYSTEM STATUS: STANDBY_MODE [AWAITING INPUT]
            </div>
        </form>
    </div>

</body>
</html>

Formulário de login HTML com estilo CSS neon

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