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

body {
    font-family: 'Courier New', monospace;
    background: #0a0a0a;
    min-height: 100vh;
    padding: 20px;
    color: #00ff00;
    overflow-x: hidden;
    position: relative;
}

/* Matrix rain effect background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 1px,
            rgba(0, 255, 0, 0.03) 1px,
            rgba(0, 255, 0, 0.03) 2px
        );
    pointer-events: none;
    z-index: 0;
}

/* Glowing text effect */
@keyframes glow {
    0%, 100% {
        text-shadow: 0 0 5px #00ff00, 0 0 10px #00ff00, 0 0 20px #00ff00;
    }
    50% {
        text-shadow: 0 0 10px #00ff00, 0 0 20px #00ff00, 0 0 40px #00ff00;
    }
}

@keyframes glitch {
    0%, 100% {
        transform: translate(0);
        filter: hue-rotate(0deg);
    }
    20% {
        transform: translate(-2px, 2px);
        filter: hue-rotate(90deg);
    }
    40% {
        transform: translate(-2px, -2px);
        filter: hue-rotate(180deg);
    }
    60% {
        transform: translate(2px, 2px);
        filter: hue-rotate(270deg);
    }
    80% {
        transform: translate(2px, -2px);
        filter: hue-rotate(360deg);
    }
}

@keyframes scanline {
    0% {
        transform: translateY(-100%);
    }
    100% {
        transform: translateY(100%);
    }
}

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }
    51%, 100% {
        opacity: 0;
    }
}

.scanline {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        transparent,
        rgba(0, 255, 0, 0.1),
        transparent
    );
    animation: scanline 3s linear infinite;
    pointer-events: none;
    z-index: 1000;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

header {
    text-align: center;
    color: #00ff00;
    margin-bottom: 40px;
    padding: 30px;
    background: rgba(0, 20, 0, 0.8);
    border: 2px solid #00ff00;
    border-radius: 0;
    position: relative;
    overflow: hidden;
}

header::before {
    content: '>>> ACCESSING SYSTEM <<<';
    position: absolute;
    top: 5px;
    left: 10px;
    font-size: 0.8em;
    color: #00ff00;
    animation: blink 1s infinite;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    animation: glow 2s ease-in-out infinite, headerGlitch 3s ease-in-out infinite;
    text-transform: uppercase;
    letter-spacing: 3px;
    position: relative;
}

@keyframes headerGlitch {
    0%, 90%, 100% {
        transform: translate(0);
        text-shadow: 0 0 5px #00ff00, 0 0 10px #00ff00;
    }
    92% {
        transform: translate(-2px, 1px);
        text-shadow: 2px 0 #ff0000, -2px 0 #00ffff;
    }
    94% {
        transform: translate(2px, -1px);
        text-shadow: -2px 0 #ff0000, 2px 0 #00ffff;
    }
    96% {
        transform: translate(-1px, 2px);
        text-shadow: 1px 0 #ff0000, -1px 0 #00ffff;
    }
    98% {
        transform: translate(1px, -2px);
        text-shadow: -1px 0 #ff0000, 1px 0 #00ffff;
    }
}

header p {
    font-size: 1.2em;
    opacity: 0.9;
    text-shadow: 0 0 10px #00ff00;
}

.game-section {
    margin-bottom: 40px;
}

.safe-container {
    background: rgba(0, 20, 0, 0.9);
    border: 3px solid #00ff00;
    border-radius: 0;
    padding: 40px;
    box-shadow: 0 0 30px rgba(0, 255, 0, 0.3), inset 0 0 30px rgba(0, 255, 0, 0.1);
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

.safe-container::before {
    content: '⚠ ENCRYPTED SYSTEM ⚠';
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: #0a0a0a;
    color: #00ff00;
    padding: 5px 20px;
    border: 2px solid #00ff00;
    font-size: 0.9em;
    animation: blink 1.5s infinite;
}

.safe-door {
    animation: fadeIn 0.5s ease-in;
}

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

/* Terminal typing effect */
@keyframes typing {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

.safe-display {
    text-align: center;
    margin-bottom: 30px;
}

.target-number {
    font-size: 3em;
    font-weight: bold;
    color: #00ff00;
    margin-bottom: 15px;
    animation: glow 1.5s ease-in-out infinite, numberPulse 2s ease-in-out infinite;
    text-shadow: 0 0 20px #00ff00;
    position: relative;
}

@keyframes numberPulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

.target-number .label {
    font-size: 0.4em;
    color: #00ff00;
    margin-right: 10px;
    text-transform: uppercase;
}

.instruction {
    color: #00ff00;
    font-size: 1.1em;
    padding: 15px;
    background: rgba(0, 50, 0, 0.5);
    border: 1px solid #00ff00;
    border-radius: 0;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 0 10px rgba(0, 255, 0, 0.3);
}

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

.input-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.input-group input {
    width: 100px;
    padding: 15px;
    font-size: 1.2em;
    border: 2px solid #00ff00;
    border-radius: 0;
    text-align: center;
    transition: all 0.3s ease;
    background: rgba(0, 20, 0, 0.8);
    color: #00ff00;
    font-family: 'Courier New', monospace;
    text-transform: uppercase;
}

.input-group input:focus {
    outline: none;
    border-color: #00ff00;
    box-shadow: 0 0 20px rgba(0, 255, 0, 0.5);
    animation: glow 1s ease-in-out infinite, inputFocus 0.3s ease-out;
}

@keyframes inputFocus {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.02);
    }
    100% {
        transform: scale(1);
    }
}

.multiply {
    font-size: 2em;
    color: #00ff00;
    font-weight: bold;
    text-shadow: 0 0 10px #00ff00;
}

.btn-check {
    width: 100%;
    padding: 15px;
    font-size: 1.2em;
    background: rgba(0, 50, 0, 0.8);
    color: #00ff00;
    border: 2px solid #00ff00;
    border-radius: 0;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-family: 'Courier New', monospace;
    position: relative;
    overflow: hidden;
}

.btn-check::before {
    content: '█';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.btn-check:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 255, 0, 0.5);
    background: rgba(0, 80, 0, 0.9);
    animation: buttonPulse 0.5s ease-in-out infinite;
}

@keyframes buttonPulse {
    0%, 100% {
        box-shadow: 0 0 30px rgba(0, 255, 0, 0.5);
    }
    50% {
        box-shadow: 0 0 50px rgba(0, 255, 0, 0.8);
    }
}

.btn-check:active {
    transform: translateY(0);
}

.result {
    text-align: center;
    padding: 20px;
    border-radius: 0;
    margin-top: 20px;
    font-size: 1.2em;
    font-weight: bold;
    display: none;
    font-family: 'Courier New', monospace;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.result.success {
    display: block;
    background: rgba(0, 50, 0, 0.8);
    color: #00ff00;
    border: 2px solid #00ff00;
    animation: glow 1s ease-in-out infinite;
    box-shadow: 0 0 20px rgba(0, 255, 0, 0.5);
}

.result.error {
    display: block;
    background: rgba(50, 0, 0, 0.8);
    color: #ff0000;
    border: 2px solid #ff0000;
    animation: glitch 0.3s ease-in-out infinite;
    box-shadow: 0 0 20px rgba(255, 0, 0, 0.5);
}

.safe-opened {
    text-align: center;
    animation: openSafe 0.8s ease-in-out;
}

@keyframes openSafe {
    0% {
        transform: scale(0.8);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

.success-message {
    padding: 40px;
    position: relative;
}

.success-message::before {
    content: '████████████████████████████████████████';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: #00ff00;
    animation: scanline 2s linear infinite;
}

.success-message h2 {
    color: #00ff00;
    font-size: 2.5em;
    margin-bottom: 20px;
    animation: glow 1s ease-in-out infinite;
    text-transform: uppercase;
    letter-spacing: 3px;
}

.success-message p {
    font-size: 1.3em;
    color: #00ff00;
    margin-bottom: 30px;
    text-shadow: 0 0 10px #00ff00;
}

/* Hacking animation for success */
@keyframes hackSuccess {
    0% {
        content: 'ACCESSING...';
    }
    25% {
        content: 'DECRYPTING...';
    }
    50% {
        content: 'BYPASSING...';
    }
    75% {
        content: 'UNLOCKING...';
    }
    100% {
        content: 'ACCESS GRANTED';
    }
}

/* 3D Safe Opening Animation */
@keyframes safeDoorOpen {
    0% {
        transform: perspective(1000px) rotateY(0deg);
        opacity: 1;
    }
    50% {
        transform: perspective(1000px) rotateY(-45deg);
        opacity: 0.8;
    }
    100% {
        transform: perspective(1000px) rotateY(-90deg);
        opacity: 0;
    }
}

@keyframes safeReveal {
    0% {
        transform: scale(0.5);
        opacity: 0;
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Safe 3D Container */
.safe-3d-container {
    perspective: 1000px;
    position: relative;
}

.safe-door-3d {
    transform-style: preserve-3d;
    transition: transform 1s ease-in-out;
}

.safe-door-3d.opening {
    animation: safeDoorOpen 1s ease-in-out forwards;
}

.safe-content-3d {
    transform-style: preserve-3d;
    opacity: 0;
    transform: translateZ(-50px);
}

.safe-content-3d.revealed {
    animation: safeReveal 0.5s ease-out 0.5s forwards;
}

/* Lock Mechanism Animation */
@keyframes unlockMechanism {
    0% {
        transform: rotate(0deg);
    }
    25% {
        transform: rotate(-15deg);
    }
    50% {
        transform: rotate(15deg);
    }
    75% {
        transform: rotate(-5deg);
    }
    100% {
        transform: rotate(0deg);
    }
}

.lock-mechanism {
    animation: unlockMechanism 0.5s ease-in-out;
}

/* Digital Rain Effect */
@keyframes digitalRain {
    0% {
        transform: translateY(-100%);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(100vh);
        opacity: 0;
    }
}

.digital-rain {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.rain-drop {
    position: absolute;
    color: #00ff00;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    animation: digitalRain linear infinite;
    text-shadow: 0 0 5px #00ff00;
}

.btn-new {
    padding: 15px 40px;
    font-size: 1.2em;
    background: rgba(0, 50, 0, 0.8);
    color: #00ff00;
    border: 2px solid #00ff00;
    border-radius: 0;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-family: 'Courier New', monospace;
}

.btn-new:hover {
    background: rgba(0, 80, 0, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 255, 0, 0.5);
    animation: glow 1s ease-in-out infinite;
}

.info-section {
    background: rgba(0, 20, 0, 0.9);
    border: 2px solid #00ff00;
    border-radius: 0;
    padding: 40px;
    box-shadow: 0 0 30px rgba(0, 255, 0, 0.3);
    position: relative;
}

.info-section::before {
    content: '/// CLASSIFIED DATA ///';
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: #0a0a0a;
    color: #00ff00;
    padding: 5px 20px;
    border: 2px solid #00ff00;
    font-size: 0.9em;
    animation: blink 2s infinite;
}

.info-section h2 {
    color: #00ff00;
    margin-bottom: 30px;
    text-align: center;
    font-size: 2em;
    animation: glow 2s ease-in-out infinite;
    text-transform: uppercase;
    letter-spacing: 3px;
}

.info-card {
    background: rgba(0, 30, 0, 0.8);
    padding: 25px;
    border-radius: 0;
    margin-bottom: 20px;
    border-left: 4px solid #00ff00;
    border-top: 1px solid #00ff00;
    border-bottom: 1px solid #00ff00;
    position: relative;
}

.info-card::before {
    content: '>';
    position: absolute;
    left: -15px;
    top: 25px;
    color: #00ff00;
    font-size: 1.5em;
    animation: blink 1s infinite;
}

.info-card h3 {
    color: #00ff00;
    margin-bottom: 15px;
    font-size: 1.4em;
    text-transform: uppercase;
    letter-spacing: 2px;
    text-shadow: 0 0 10px #00ff00;
}

.info-card p {
    line-height: 1.6;
    color: #00ff00;
    margin-bottom: 15px;
    opacity: 0.9;
}

.info-card ul {
    list-style: none;
    padding-left: 0;
}

.info-card li {
    padding: 10px 0;
    border-bottom: 1px solid rgba(0, 255, 0, 0.3);
    line-height: 1.6;
    color: #00ff00;
    opacity: 0.9;
}

.info-card li::before {
    content: '>> ';
    color: #00ff00;
    font-weight: bold;
}

.info-card li:last-child {
    border-bottom: none;
}

.info-card strong {
    color: #00ff00;
    text-shadow: 0 0 5px #00ff00;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }

    .safe-container {
        padding: 20px;
    }

    .target-number {
        font-size: 2em;
    }

    .input-group {
        flex-direction: column;
    }

    .input-group input {
        width: 100%;
    }

    .multiply {
        transform: rotate(90deg);
    }

    .info-section {
        padding: 20px;
    }
}