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HTML

<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Secure Access Terminal</title>
    <link rel="stylesheet" href="styles.css">
</head>
<body>
    <div class="container">
        <header>
            <h1 class="glitch-title">ERROR: ACCESS DENIED</h1>
        </header>

<main>
            <section class="keypad-section">
                <div class="keypad-container">
                    <div class="pin-display">
                        <div class="pin-dots">
                            <span class="pin-dot"></span>
                            <span class="pin-dot"></span>
                            <span class="pin-dot"></span>
                            <span class="pin-dot"></span>
                        </div>
                    </div>
                    <div class="keypad-grid">
                        <button class="key" data-key="1">1</button>
                        <button class="key" data-key="2">2</button>
                        <button class="key" data-key="3">3</button>
                        <button class="key" data-key="4">4</button>
                        <button class="key" data-key="5">5</button>
                        <button class="key" data-key="6">6</button>
                        <button class="key" data-key="7">7</button>
                        <button class="key" data-key="8">8</button>
                        <button class="key" data-key="9">9</button>
                        <button class="key key-delete" data-key="delete">DEL</button>
                        <button class="key" data-key="0">0</button>
                        <button class="key key-unlock" data-key="unlock">UNLOCK</button>
                    </div>
                </div>
            </section>

<section class="log-section">
                <div class="log-container">
                    <div class="log-header">
                        <h2>CIPHER ATTEMPT LOG</h2>
                        <div class="attempts-counter">
                            <span class="attempts-text">ATTEMPTS REMAINING:</span>
                            <span class="attempts-number">5</span>
                        </div>
                    </div>
                    <div class="log-content" id="log-content">
                        <div class="log-placeholder">
                            <div class="scanner-line"></div>
                            <p>ENTER ACCESS CODE</p>
                            <p>5 ATTEMPTS BEFORE SECURITY LOCKDOWN</p>
                        </div>
                    </div>
                </div>
            </section>
        </main>

CSS

@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;700;900&family=Share+Tech+Mono&display=swap');

:root {
    --primary-color: #00ffd5;
    --secondary-color: #ff005b;
    --tertiary-color: #001eff;
    --background-dark: #0a0a14;
    --glass-bg: rgba(23, 25, 35, 0.65);
    --glass-border: rgba(255, 255, 255, 0.1);
    --neu-shadow-dark: rgba(0, 0, 0, 0.4);
    --neu-shadow-light: rgba(255, 255, 255, 0.05);
    --font-main: 'Orbitron', sans-serif;
    --font-mono: 'Share Tech Mono', monospace;
}

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

body, html {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--background-dark);
    color: var(--primary-color);
    font-family: var(--font-main);
}

.container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    perspective: 1000px;
    background: radial-gradient(circle at center, #1a1a2e, #0a0a14);
    overflow: hidden;
}

header {
    position: relative;
    padding: 20px 0;
    z-index: 10;
    width: 100%;
    text-align: center;
    animation: float 4s ease-in-out infinite;
}

.glitch-title {
    font-size: 3.5rem;
    font-weight: 900;
    letter-spacing: 3px;
    position: relative;
    animation: textShadow 1.6s infinite;
    text-shadow: 0 0 10px var(--primary-color), 
                 0 0 20px var(--primary-color),
                 0 0 30px var(--primary-color);
}

.glitch-title::before, .glitch-title::after {
    content: "ERROR: ACCESS DENIED";
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0.8;
}

.glitch-title::before {
    color: var(--secondary-color);
    animation: glitch 2s infinite;
    clip-path: polygon(0 0, 100% 0, 100% 45%, 0 45%);
    transform: translate(-2px, -2px);
}

.glitch-title::after {
    color: var(--tertiary-color);
    animation: glitch 2s infinite;
    clip-path: polygon(0 60%, 100% 60%, 100% 100%, 0 100%);
    transform: translate(2px, 2px);
}

main {
    display: flex;
    flex: 1;
    padding: 0 20px 30px;
    perspective: 1000px;
    z-index: 5;
    position: relative;
    margin: -35px auto;
}

.keypad-section, .log-section {
    flex: 1;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
    animation: fadeIn 1.5s ease-out forwards;
}

.keypad-container {
    width: min(380px, 90%);
    padding: 30px;
    border-radius: 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 15px 35px var(--neu-shadow-dark),
                inset 0 1px 1px var(--neu-shadow-light),
                0 0 20px rgba(0, 255, 213, 0.2);
    transform-style: preserve-3d;
    animation: floatKeypad 6s ease-in-out infinite;
    position: relative;
    overflow: hidden;
}

.keypad-container::before {
    content: "";
    position: absolute;
    top: -100px;
    left: -100px;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(0, 255, 213, 0.1) 0%, transparent 70%);
    opacity: 0.5;
    animation: moveGlow 15s infinite alternate;
}

.pin-display {
    margin-bottom: 30px;
    height: 60px;
    background: rgba(10, 12, 18, 0.8);
    border-radius: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.5),
                0 1px 1px rgba(255, 255, 255, 0.05);
    position: relative;
}

.pin-dots {
    display: flex;
    justify-content: center;
    gap: 20px;
}

.pin-dot {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
    transition: all 0.3s ease;
}

.pin-dot.active {
    background: var(--primary-color);
    box-shadow: 0 0 10px var(--primary-color),
                0 0 20px var(--primary-color);
    animation: pulseDot 1.5s infinite;
}

.keypad-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 15px;
}

.key {
    height: clamp(50px, 10vh, 70px);
    border-radius: 15px;
    font-family: var(--font-main);
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    background: linear-gradient(145deg, #15152a, #1a1a33);
    border: none;
    box-shadow: 5px 5px 10px var(--neu-shadow-dark),
                -5px -5px 10px var(--neu-shadow-light);
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.2, 0.85, 0.45, 1);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.key::before {
    content: "";
    position: absolute;
    top: -10px;
    left: -10px;
    width: calc(100% + 20px);
    height: calc(100% + 20px);
    background: radial-gradient(circle at 50% 50%, rgba(0, 255, 213, 0.2), transparent 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

.key:hover {
    transform: translateY(-2px);
}

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

.key:active {
    transform: translateY(2px);
    box-shadow: 3px 3px 6px var(--neu-shadow-dark),
                -3px -3px 6px var(--neu-shadow-light),
                0 0 15px rgba(0, 255, 213, 0.3);
    background: linear-gradient(145deg, #14142a, #191932);
}

.key-delete {
    font-size: 1.2rem;
    color: var(--secondary-color);
}

.key-unlock {
    font-size: 1.2rem;
    color: #0f0;
}

.key-delete:active, .key-unlock:active {
    box-shadow: 3px 3px 6px var(--neu-shadow-dark),
                -3px -3px 6px var(--neu-shadow-light),
                0 0 15px rgba(255, 0, 89, 0.3);
}

.key.clicked {
    animation: keyPress 0.3s forwards;
}

.log-container {
    width: min(440px, 90%);  
    height: min(500px, 80vh);  
    padding: 30px;
    border-radius: 20px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 15px 35px var(--neu-shadow-dark),
                inset 0 1px 1px var(--neu-shadow-light),
                0 0 20px rgba(0, 255, 213, 0.2);
    display: flex;
    flex-direction: column;
    animation: floatLog 7s ease-in-out infinite;
    transform-style: preserve-3d;
}

.log-header {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid rgba(0, 255, 213, 0.3);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.log-header h2 {
    font-size: 1.8rem;
    letter-spacing: 2px;
    background: linear-gradient(90deg, var(--primary-color), #1ef3ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: pulse 3s infinite alternate;
}

.attempts-counter {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-family: var(--font-mono);
    font-size: 1.2rem;
}

.attempts-number {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    text-shadow: 0 0 10px var(--primary-color);
    animation: pulsate 2s infinite alternate;
}

.log-content {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    font-family: var(--font-mono);
    position: relative;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) rgba(0, 0, 0, 0.2);
}

.log-content::-webkit-scrollbar {
    width: 8px;
}

.log-content::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 4px;
}

.log-content::-webkit-scrollbar-thumb {
    background-color: var(--primary-color);
    border-radius: 4px;
}

.log-placeholder {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: rgba(255, 255, 255, 0.6);
    position: relative;
    overflow: hidden;
}

.log-placeholder p {
    font-size: 1.2rem;
    margin: 5px 0;
    text-align: center;
    letter-spacing: 1px;
}

.scanner-line {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--primary-color);
    box-shadow: 0 0 10px var(--primary-color), 0 0 20px var(--primary-color);
    animation: scanLine 2s linear infinite;
}

.log-entry {
    margin-bottom: 15px;
    padding: 10px 15px;
    background: rgba(10, 15, 20, 0.6);
    border-left: 3px solid var(--primary-color);
    border-radius: 5px;
    animation: fadeInUp 0.5s forwards;
    position: relative;
    overflow: hidden;
}

.log-entry::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 255, 213, 0.1), transparent);
    transform: translateX(-100%);
    animation: scan 2s ease-in-out infinite;
}

.log-entry.error {
    border-left-color: var(--secondary-color);
    background: rgba(20, 0, 10, 0.6);
}

.log-entry.success {
    border-left-color: #0f0;
    background: rgba(0, 20, 10, 0.6);
}

.log-entry .timestamp {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 5px;
}

.log-entry .code {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.log-entry .digit {
    width: 30px;
    height: 30px;
    display: flex;
    justify-content: center;
    align-items: center;
    border-radius: 5px;
    font-weight: bold;
    background: rgba(255, 255, 255, 0.1);
}

.log-entry .digit.correct {
    background: rgba(0, 255, 0, 0.2);
    color: #0f0;
    box-shadow: 0 0 5px #0f0;
    animation: pulse 2s infinite alternate;
}

.log-entry .digit.wrong-position {
    background: rgba(255, 255, 0, 0.2);
    color: #ff0;
    box-shadow: 0 0 5px #ff0;
}

.log-entry .digit.wrong {
    background: rgba(255, 0, 0, 0.2);
    color: #f55;
    box-shadow: 0 0 5px #f55;
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at center, transparent 40%, rgba(0, 0, 0, 0.5) 100%);
    pointer-events: none;
    z-index: 2;
}

.scanlines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, 
        rgba(255, 255, 255, 0) 0%, 
        rgba(255, 255, 255, 0.01) 50%, 
        rgba(255, 255, 255, 0) 100%);
    background-size: 100% 4px;
    pointer-events: none;
    z-index: 3;
    animation: scanlines 1s steps(60) infinite;
    opacity: 0.2;
}

.glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(0, 255, 213, 0.1), transparent 70%);
    pointer-events: none;
    z-index: 1;
    animation: pulseGlow 8s ease-in-out infinite alternate;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

@keyframes floatKeypad {
    0%, 100% { transform: translateY(0) rotateX(5deg); }
    50% { transform: translateY(-15px) rotateX(2deg); }
}

@keyframes floatLog {
    0%, 100% { transform: translateY(0) rotateY(-5deg); }
    50% { transform: translateY(-10px) rotateY(-2deg); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

@keyframes pulsate {
    0% { text-shadow: 0 0 5px var(--primary-color); }
    100% { text-shadow: 0 0 20px var(--primary-color), 0 0 30px var(--primary-color); }
}

@keyframes pulseDot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(0.8); }
}

@keyframes scanLine {
    0% { top: 0; }
    100% { top: 100%; }
}

@keyframes scan {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

@keyframes fadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

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

@keyframes keyPress {
    0% { transform: scale(1); }
    50% { transform: scale(0.95); background: linear-gradient(145deg, #1a1a33, #15152a); }
    100% { transform: scale(1); }
}

@keyframes glitch {
    0% { transform: translate(0); }
    20% { transform: translate(-3px, 3px); }
    40% { transform: translate(-3px, -3px); }
    60% { transform: translate(3px, 3px); }
    80% { transform: translate(3px, -3px); }
    100% { transform: translate(0); }
}

@keyframes textShadow {
    0% { text-shadow: 0.4389924193300864px 0 1px rgba(0, 255, 213, 0.5), 
                     -0.4389924193300864px 0 1px rgba(255, 0, 91, 0.3), 
                     0 0 3px; }
    5% { text-shadow: 2.7928974010788217px 0 1px rgba(0, 255, 213, 0.5), 
                     -2.7928974010788217px 0 1px rgba(255, 0, 91, 0.3), 
                     0 0 3px; }
    10% { text-shadow: 0.02956275843481219px 0 1px rgba(0, 255, 213, 0.5), 
                      -0.02956275843481219px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    15% { text-shadow: 0.40218538552878136px 0 1px rgba(0, 255, 213, 0.5), 
                      -0.40218538552878136px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    20% { text-shadow: 3.4794037899852017px 0 1px rgba(0, 255, 213, 0.5), 
                      -3.4794037899852017px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    25% { text-shadow: 1.6125630401149584px 0 1px rgba(0, 255, 213, 0.5), 
                      -1.6125630401149584px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    30% { text-shadow: 0.7015590085143956px 0 1px rgba(0, 255, 213, 0.5), 
                      -0.7015590085143956px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    35% { text-shadow: 3.896914047650351px 0 1px rgba(0, 255, 213, 0.5), 
                      -3.896914047650351px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    40% { text-shadow: 3.870905614848819px 0 1px rgba(0, 255, 213, 0.5), 
                      -3.870905614848819px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    45% { text-shadow: 2.231056963361899px 0 1px rgba(0, 255, 213, 0.5), 
                      -2.231056963361899px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    50% { text-shadow: 0.08084290417898504px 0 1px rgba(0, 255, 213, 0.5), 
                      -0.08084290417898504px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    55% { text-shadow: 2.3758461067427543px 0 1px rgba(0, 255, 213, 0.5), 
                      -2.3758461067427543px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    60% { text-shadow: 2.202193051050636px 0 1px rgba(0, 255, 213, 0.5), 
                      -2.202193051050636px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    65% { text-shadow: 2.8638780614874975px 0 1px rgba(0, 255, 213, 0.5), 
                      -2.8638780614874975px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    70% { text-shadow: 0.48874025155497314px 0 1px rgba(0, 255, 213, 0.5), 
                      -0.48874025155497314px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    75% { text-shadow: 1.8948491305757957px 0 1px rgba(0, 255, 213, 0.5), 
                      -1.8948491305757957px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    80% { text-shadow: 0.0833037308038857px 0 1px rgba(0, 255, 213, 0.5), 
                      -0.0833037308038857px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    85% { text-shadow: 0.09769827255241735px 0 1px rgba(0, 255, 213, 0.5), 
                      -0.09769827255241735px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    90% { text-shadow: 3.443339761481782px 0 1px rgba(0, 255, 213, 0.5), 
                      -3.443339761481782px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    95% { text-shadow: 2.1841838852799786px 0 1px rgba(0, 255, 213, 0.5), 
                      -2.1841838852799786px 0 1px rgba(255, 0, 91, 0.3), 
                      0 0 3px; }
    100% { text-shadow: 2.6208764473832513px 0 1px rgba(0, 255, 213, 0.5), 
                       -2.6208764473832513px 0 1px rgba(255, 0, 91, 0.3), 
                       0 0 3px; }
}

@keyframes scanlines {
    from { background-position: 0 0; }
    to { background-position: 0 100%; }
}

@keyframes pulseGlow {
    0% { opacity: 0.3; }
    50% { opacity: 0.6; }
    100% { opacity: 0.3; }
}

@keyframes moveGlow {
    0% { transform: translate(0, 0); }
    25% { transform: translate(250px, 100px); }
    50% { transform: translate(100px, 250px); }
    75% { transform: translate(300px, 0); }
    100% { transform: translate(0, 200px); }
}

@media (max-width: 200px) {
    main {
        flex-direction: column;
        padding: 0 20px 20px;
    }

.keypad-section, .log-section {
        padding: 10px;
    }

.glitch-title {
        font-size: 2.5rem;
    }
}

JS

const PIN_LENGTH = 4;
const MAX_ATTEMPTS = 5;
const CORRECT_PIN = (() => {
  const digits = new Set();
  while (digits.size < 4) { digits.add(Math.floor(Math.random() * 10));
  }
  return Array.from(digits).join('');
})();

const pinDots = document.querySelectorAll('.pin-dot');
const keys = document.querySelectorAll('.key');
const attemptsCounter = document.querySelector('.attempts-number');
const logContent = document.getElementById('log-content');
const container = document.querySelector('.container');

let currentPin = '';
let attemptsRemaining = MAX_ATTEMPTS;
let isLocked = false;

function init() {
    addEventListeners();
    animateElements();
}

function addEventListeners() {
    keys.forEach(key => {
        key.addEventListener('click', () => handleKeyPress(key));

key.addEventListener('mouseenter', () => {
            playSound('hover');
        });
    });

document.addEventListener('keydown', (e) => {
        if (e.code === 'Space') {
            toggleBackgroundAudio();
        }
    });
}

function handleKeyPress(key) {
    if (isLocked) return;

key.classList.add('clicked');
    setTimeout(() => key.classList.remove('clicked'), 300);

playSound('keypress');

const keyValue = key.getAttribute('data-key');

switch (keyValue) {
        case 'delete':
            deleteLastDigit();
            break;
        case 'unlock':
            attemptUnlock();
            break;
        default:

if (currentPin.length < PIN_LENGTH) {
                addDigit(keyValue);
            }
    }
}

function addDigit(digit) {
    if (currentPin.length < PIN_LENGTH) {
        currentPin += digit;
        updatePinDisplay();

if (currentPin.length === PIN_LENGTH) {
            setTimeout(attemptUnlock, 500);
        }
    }
}

function deleteLastDigit() {
    if (currentPin.length > 0) {
        currentPin = currentPin.slice(0, -1);
        updatePinDisplay();
    }
}

function attemptUnlock() {
    if (currentPin.length !== PIN_LENGTH) {
        shakeEffect('.pin-display');
        playSound('error');
        return;
    }

attemptsRemaining--;
    attemptsCounter.textContent = attemptsRemaining;

const isCorrect = checkPin(currentPin);

if (isCorrect) {
        handleSuccessfulUnlock();
    } else {
        handleFailedAttempt();
    }

currentPin = '';
    updatePinDisplay();
}

function checkPin(pin) {
    return pin === CORRECT_PIN;
}

function getPinFeedback(enteredPin) {
    const feedback = [];

for (let i = 0; i < PIN_LENGTH; i++) {
        if (i < enteredPin.length) {
            const digit = enteredPin[i];

if (digit === CORRECT_PIN[i]) {
                feedback.push('correct');
            } else if (CORRECT_PIN.includes(digit)) {
                feedback.push('wrong-position');
            } else {
                feedback.push('wrong');
            }
        } else {
            feedback.push('empty');
        }
    }

return feedback;
}

function handleSuccessfulUnlock() {
    playSound('success');

addLogEntry({
        message: 'ACCESS GRANTED - DECRYPTION SUCCESSFUL',
        pin: currentPin,
        feedback: getPinFeedback(currentPin),
        type: 'success'
    });

container.classList.add('access-granted');

document.body.style.animation = 'pulseSuccess 0.5s 3';

setTimeout(() => {
        alert('Access granted! System unlocked.');
        resetSystem();
    }, 1500);
}

function handleFailedAttempt() {
    playSound('error');
    shakeEffect('.keypad-container');

addLogEntry({
        message: `INVALID PIN - ATTEMPT ${MAX_ATTEMPTS - attemptsRemaining} OF ${MAX_ATTEMPTS}`,
        pin: currentPin,
        feedback: getPinFeedback(currentPin),
        type: 'error'
    });

if (attemptsRemaining <= 0) {
        setTimeout(lockSystem, 500);
    }
}

function lockSystem() {
    isLocked = true;

const lockMessage = 'SECURITY BREACH DETECTED - SYSTEM LOCKED';
    addLogEntry({
        message: lockMessage,
        type: 'error',
        isLockout: true
    });

playSound('lockdown');

shakeEffect('.keypad-container', 10);
    shakeEffect('.log-container', 10);

container.classList.add('system-locked');

setTimeout(() => {
        alert('Too many failed attempts. System locked!');
        resetSystem();
    }, 3000);
}

function resetSystem() {

currentPin = '';
    attemptsRemaining = MAX_ATTEMPTS;
    isLocked = false;

updatePinDisplay();
    attemptsCounter.textContent = attemptsRemaining;
    container.classList.remove('system-locked', 'access-granted');

if (logContent.querySelector('.log-placeholder')) {
        return; 
    }

logContent.innerHTML = `
        <div class="log-placeholder">
            <div class="scanner-line"></div>
            <p>ENTER ACCESS CODE</p>
            <p>5 ATTEMPTS BEFORE SECURITY LOCKDOWN</p>
        </div>
    `;

playSound('reset');
}

function addLogEntry(entry) {

const placeholder = logContent.querySelector('.log-placeholder');
    if (placeholder) {
        logContent.removeChild(placeholder);
    }

const logEntry = document.createElement('div');
    logEntry.className = `log-entry ${entry.type || ''}`;

const now = new Date();
    const timestamp = `${now.getHours().toString().padStart(2, '0')}:${now.getMinutes().toString().padStart(2, '0')}:${now.getSeconds().toString().padStart(2, '0')}.${now.getMilliseconds().toString().padStart(3, '0')}`;

let logHTML = `<div class="timestamp">[${timestamp}]</div>`;
    logHTML += `<div class="message">${entry.message}</div>`;

if (entry.pin && entry.feedback) {
        logHTML += '<div class="code">';

for (let i = 0; i < PIN_LENGTH; i++) {
            if (i < entry.pin.length) {
                const digitClass = entry.feedback[i];
                logHTML += `<div class="digit ${digitClass}">${entry.pin[i]}</div>`;
            } else {
                logHTML += `<div class="digit">-</div>`;
            }
        }

logHTML += '</div>';
    }

if (entry.isLockout) {
        logHTML += `
            <div class="lockout-animation">
                <div class="lockout-text">SYSTEM LOCKDOWN</div>
            </div>
        `;
    }

logEntry.innerHTML = logHTML;
    logContent.appendChild(logEntry);

logContent.scrollTop = logContent.scrollHeight;
}

function shakeEffect(selector, intensity = 5) {
    const element = document.querySelector(selector);
    element.style.animation = `shake 0.5s cubic-bezier(.36,.07,.19,.97) both`;
    element.style.transform = `translate3d(0, 0, 0)`;

let style = document.getElementById('shake-style');
    if (!style) {
        style = document.createElement('style');
        style.id = 'shake-style';
        document.head.appendChild(style);
    }

style.innerHTML = keyframes;

setTimeout(() => {
        element.style.animation = '';
    }, 500);
}

function playSound(type) {

if (!window.audioContext) {
        window.audioContext = new (window.AudioContext || window.webkitAudioContext)();
    }

const context = window.audioContext;

const oscillator = context.createOscillator();
    const gain = context.createGain();

oscillator.connect(gain);
    gain.connect(context.destination);

switch (type) {
        case 'keypress':
            oscillator.type = 'sine';
            oscillator.frequency.setValueAtTime(880, context.currentTime);
            oscillator.frequency.exponentialRampToValueAtTime(440, context.currentTime + 0.1);
            gain.gain.setValueAtTime(0.2, context.currentTime);
            gain.gain.exponentialRampToValueAtTime(0.01, context.currentTime + 0.1);
            oscillator.start(context.currentTime);
            oscillator.stop(context.currentTime + 0.1);
            break;

case 'error':
            oscillator.type = 'sawtooth';
            oscillator.frequency.setValueAtTime(300, context.currentTime);
            oscillator.frequency.setValueAtTime(280, context.currentTime + 0.1);
            oscillator.frequency.setValueAtTime(260, context.currentTime + 0.2);
            gain.gain.setValueAtTime(0.3, context.currentTime);
            gain.gain.exponentialRampToValueAtTime(0.01, context.currentTime + 0.3);
            oscillator.start(context.currentTime);
            oscillator.stop(context.currentTime + 0.3);
            break;

case 'success':
            oscillator.type = 'sine';
            oscillator.frequency.setValueAtTime(440, context.currentTime);
            oscillator.frequency.setValueAtTime(554, context.currentTime + 0.1);
            oscillator.frequency.setValueAtTime(659, context.currentTime + 0.2);
            gain.gain.setValueAtTime(0.3, context.currentTime);
            gain.gain.exponentialRampToValueAtTime(0.01, context.currentTime + 0.3);
            oscillator.start(context.currentTime);
            oscillator.stop(context.currentTime + 0.3);
            break;

case 'lockdown':
            oscillator.type = 'triangle';
            oscillator.frequency.setValueAtTime(180, context.currentTime);
            oscillator.frequency.setValueAtTime(150, context.currentTime + 0.1);
            oscillator.frequency.setValueAtTime(120, context.currentTime + 0.2);
            oscillator.frequency.setValueAtTime(100, context.currentTime + 0.3);
            gain.gain.setValueAtTime(0.4, context.currentTime);
            gain.gain.exponentialRampToValueAtTime(0.01, context.currentTime + 0.4);
            oscillator.start(context.currentTime);
            oscillator.stop(context.currentTime + 0.4);
            break;

case 'hover':
            oscillator.type = 'sine';
            oscillator.frequency.setValueAtTime(1760, context.currentTime);
            gain.gain.setValueAtTime(0.05, context.currentTime);
            gain.gain.exponentialRampToValueAtTime(0.01, context.currentTime + 0.05);
            oscillator.start(context.currentTime);
            oscillator.stop(context.currentTime + 0.05);
            break;

case 'reset':
            oscillator.type = 'sine';
            oscillator.frequency.setValueAtTime(659, context.currentTime);
            oscillator.frequency.setValueAtTime(554, context.currentTime + 0.1);
            oscillator.frequency.setValueAtTime(440, context.currentTime + 0.2);
            gain.gain.setValueAtTime(0.2, context.currentTime);
            gain.gain.exponentialRampToValueAtTime(0.01, context.currentTime + 0.3);
            oscillator.start(context.currentTime);
            oscillator.stop(context.currentTime + 0.3);
            break;
    }
}

let backgroundAudio = null;

function createBackgroundAudio() {
    if (!window.audioContext) {
        window.audioContext = new (window.AudioContext || window.webkitAudioContext)();
    }

const context = window.audioContext;

const bufferSize = 2 * context.sampleRate;
    const noiseBuffer = context.createBuffer(1, bufferSize, context.sampleRate);
    const output = noiseBuffer.getChannelData(0);

for (let i = 0; i < bufferSize; i++) {
        output[i] = Math.random() * 2 - 1;
    }

const noise = context.createBufferSource();
    noise.buffer = noiseBuffer;
    noise.loop = true;

const filter = context.createBiquadFilter();
    filter.type = 'lowpass';
    filter.frequency.value = 400;

const gain = context.createGain();
    gain.gain.value = 0.03;

noise.connect(filter);
    filter.connect(gain);
    gain.connect(context.destination);

noise.start(0);

return {
        noise,
        gain,
        filter,
        isPlaying: true
    };
}

function animateElements() {

document.addEventListener('click', () => {
        if (!backgroundAudio) {
            backgroundAudio = createBackgroundAudio();
        }
    }, { once: true });
}

init();

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