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

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #000000;
    color: white;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

#computerCanvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.music-btn {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1000;
    background: rgba(0, 255, 255, 0.3);
    border: 2px solid #00ffff;
    color: #00ffff;
    padding: 12px 25px;
    border-radius: 50px;
    cursor: pointer;
    font-size: 1.1em;
    font-weight: 700;
    transition: all 0.3s;
    backdrop-filter: blur(10px);
}

.music-btn:hover {
    background: #00ffff;
    color: #000;
    transform: scale(1.1);
    box-shadow: 0 0 30px rgba(0, 255, 255, 0.8);
}

.stars {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.star {
    position: absolute;
    width: 2px;
    height: 2px;
    background: white;
    border-radius: 50%;
    animation: twinkle 3s infinite;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.3; }
    50% { opacity: 1; }
}

.particle-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 2;
}

.particle {
    position: absolute;
    width: 6px;
    height: 6px;
    background: #00ffff;
    border-radius: 50%;
    box-shadow: 0 0 15px #00ffff;
    animation: float-up 12s infinite;
    opacity: 0;
}

@keyframes float-up {
    0% {
        transform: translateY(100vh) translateX(0) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100vh) translateX(100px) rotate(360deg);
        opacity: 0;
    }
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 30px;
    position: relative;
    z-index: 10;
}

.header {
    margin-bottom: 40px;
}

.counter {
    text-align: center;
    font-size: 2.2em;
    color: #00ffff;
    font-weight: 700;
    text-shadow: 
        0 0 20px rgba(0, 255, 255, 0.8),
        0 0 40px rgba(0, 255, 255, 0.5),
        0 0 60px rgba(0, 255, 255, 0.3);
    margin-bottom: 20px;
    animation: glow-pulse 2s ease-in-out infinite;
    letter-spacing: 3px;
}

@keyframes glow-pulse {
    0%, 100% {
        text-shadow: 
            0 0 20px rgba(0, 255, 255, 0.8),
            0 0 40px rgba(0, 255, 255, 0.5);
    }
    50% {
        text-shadow: 
            0 0 30px rgba(0, 255, 255, 1),
            0 0 60px rgba(0, 255, 255, 0.8),
            0 0 90px rgba(0, 255, 255, 0.5);
    }
}

.progress-bar {
    width: 100%;
    height: 12px;
    background: rgba(0, 255, 255, 0.15);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 
        inset 0 0 15px rgba(0, 255, 255, 0.4),
        0 0 20px rgba(0, 255, 255, 0.2);
    border: 2px solid rgba(0, 255, 255, 0.3);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #00ffff, #00ccff, #0099ff, #00ccff, #00ffff);
    background-size: 300% 100%;
    border-radius: 20px;
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 
        0 0 25px rgba(0, 255, 255, 0.9),
        inset 0 0 10px rgba(255, 255, 255, 0.5);
    animation: shimmer 3s infinite;
    position: relative;
    overflow: hidden;
}

.progress-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
    animation: slide-light 2s infinite;
}

@keyframes shimmer {
    0% { background-position: 0% 0; }
    100% { background-position: 300% 0; }
}

@keyframes slide-light {
    0% { left: -100%; }
    100% { left: 100%; }
}

.presentation-area {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    min-height: 70vh;
}

.computer-section {
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 1500px;
}

.computer-3d {
    position: relative;
    transform-style: preserve-3d;
    animation: computer-rotate 20s infinite;
}

@keyframes computer-rotate {
    0%, 100% {
        transform: rotateY(-15deg) rotateX(5deg);
    }
    50% {
        transform: rotateY(15deg) rotateX(-5deg);
    }
}

.monitor {
    position: relative;
    width: 500px;
    height: 350px;
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
    border-radius: 20px;
    padding: 20px;
    box-shadow: 
        0 30px 80px rgba(0, 0, 0, 0.8),
        0 0 50px rgba(0, 255, 255, 0.3),
        inset 0 0 30px rgba(0, 255, 255, 0.1);
    transform-style: preserve-3d;
    border: 3px solid rgba(0, 255, 255, 0.5);
}

.screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #001a1a, #003333);
    border-radius: 10px;
    position: relative;
    overflow: hidden;
    box-shadow: 
        inset 0 0 40px rgba(0, 255, 255, 0.3),
        0 0 30px rgba(0, 255, 255, 0.2);
}

.screen-content {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3em;
    color: #00ffff;
    text-shadow: 0 0 20px rgba(0, 255, 255, 0.8);
    animation: screen-flicker 5s infinite;
}

@keyframes screen-flicker {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.95; }
}

.scanlines {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        rgba(0, 255, 255, 0.03) 0px,
        rgba(0, 255, 255, 0.03) 1px,
        transparent 1px,
        transparent 2px
    );
    pointer-events: none;
    animation: scan 8s linear infinite;
}

@keyframes scan {
    0% { transform: translateY(0); }
    100% { transform: translateY(10px); }
}

.screen-glare {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 60%);
    animation: glare-move 10s infinite;
    pointer-events: none;
}

@keyframes glare-move {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(20%, 20%); }
}

.monitor-base {
    width: 150px;
    height: 80px;
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
    margin: 20px auto 0;
    border-radius: 10px;
    box-shadow: 
        0 10px 30px rgba(0, 0, 0, 0.8),
        inset 0 0 20px rgba(0, 255, 255, 0.1);
    border: 2px solid rgba(0, 255, 255, 0.3);
    position: relative;
}

.monitor-base::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 15px;
    background: rgba(0, 255, 255, 0.1);
    border-radius: 50%;
    filter: blur(10px);
}

.keyboard {
    width: 550px;
    height: 100px;
    background: linear-gradient(135deg, #1a1a1a, #2a2a2a);
    margin-top: 40px;
    border-radius: 15px;
    display: flex;
    gap: 15px;
    padding: 20px;
    box-shadow: 
        0 20px 50px rgba(0, 0, 0, 0.7),
        inset 0 0 30px rgba(0, 255, 255, 0.05);
    border: 2px solid rgba(0, 255, 255, 0.3);
}

.key {
    flex: 1;
    height: 60px;
    background: linear-gradient(135deg, #2a2a2a, #3a3a3a);
    border-radius: 8px;
    box-shadow: 
        0 5px 15px rgba(0, 0, 0, 0.5),
        inset 0 0 10px rgba(0, 255, 255, 0.1);
    border: 1px solid rgba(0, 255, 255, 0.4);
    animation: key-glow 2s infinite;
    animation-delay: var(--delay);
}

@keyframes key-glow {
    0%, 100% {
        box-shadow: 
            0 5px 15px rgba(0, 0, 0, 0.5),
            inset 0 0 10px rgba(0, 255, 255, 0.1);
    }
    50% {
        box-shadow: 
            0 5px 20px rgba(0, 255, 255, 0.4),
            inset 0 0 15px rgba(0, 255, 255, 0.3);
    }
}

.content-section {
    padding: 60px;
    background: linear-gradient(135deg, rgba(0, 20, 40, 0.9), rgba(10, 30, 50, 0.9));
    border-radius: 35px;
    border: 4px solid rgba(0, 255, 255, 0.5);
    backdrop-filter: blur(20px);
    box-shadow: 
        0 15px 60px rgba(0, 0, 0, 0.6),
        inset 0 0 50px rgba(0, 255, 255, 0.15),
        0 0 80px rgba(0, 255, 255, 0.3);
    min-height: 550px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.content-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(
        from 0deg,
        transparent,
        rgba(0, 255, 255, 0.1),
        transparent 30%
    );
    animation: rotate-gradient 8s linear infinite;
}

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

.content-section::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 255, 255, 0.3), transparent);
    animation: slide-shine 4s infinite;
}

@keyframes slide-shine {
    0% { left: -100%; }
    100% { left: 100%; }
}

.slide-container {
    position: relative;
    width: 100%;
    height: 100%;
    z-index: 2;
}

.slide {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0;
    transform: translateX(100%) scale(0.8) rotateY(45deg);
    transition: all 0.8s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.slide.active {
    opacity: 1;
    transform: translateX(0) scale(1) rotateY(0deg);
    position: relative;
}

.slide.prev {
    transform: translateX(-100%) scale(0.8) rotateY(-45deg);
}

.emoji {
    font-size: 6em;
    margin-bottom: 30px;
    display: block;
    animation: emoji-float 3s ease-in-out infinite;
    filter: drop-shadow(0 0 30px rgba(0, 255, 255, 0.6));
    position: relative;
}

.emoji::after {
    content: attr(data-emoji);
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
    filter: blur(20px);
    opacity: 0.5;
}

@keyframes emoji-float {
    0%, 100% {
        transform: translateY(0) rotate(0deg) scale(1);
    }
    25% {
        transform: translateY(-20px) rotate(-10deg) scale(1.1);
    }
    75% {
        transform: translateY(-20px) rotate(10deg) scale(1.1);
    }
}

h1 {
    font-size: 3.5em;
    color: #00ffff;
    margin-bottom: 25px;
    text-shadow: 
        0 0 20px rgba(0, 255, 255, 0.8),
        0 0 40px rgba(0, 255, 255, 0.6),
        0 0 60px rgba(0, 255, 255, 0.4),
        0 5px 10px rgba(0, 0, 0, 0.5);
    animation: title-glow 3s ease-in-out infinite;
    letter-spacing: 2px;
}

@keyframes title-glow {
    0%, 100% {
        transform: scale(1);
        text-shadow: 
            0 0 20px rgba(0, 255, 255, 0.8),
            0 0 40px rgba(0, 255, 255, 0.6);
    }
    50% {
        transform: scale(1.05);
        text-shadow: 
            0 0 30px rgba(0, 255, 255, 1),
            0 0 60px rgba(0, 255, 255, 0.8),
            0 0 90px rgba(0, 255, 255, 0.6);
    }
}

h2 {
    font-size: 2.6em;
    color: #00ffff;
    margin-bottom: 25px;
    text-shadow: 
        0 0 15px rgba(0, 255, 255, 0.6),
        0 3px 6px rgba(0, 0, 0, 0.4);
    letter-spacing: 1px;
}

.content {
    font-size: 1.5em;
    line-height: 1.9;
    color: #ffffff;
    margin-top: 20px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
    padding: 20px;
    background: rgba(0, 255, 255, 0.05);
    border-radius: 15px;
    border-left: 4px solid rgba(0, 255, 255, 0.5);
}

.extra-info {
    font-size: 1.25em;
    line-height: 1.8;
    color: #cccccc;
    margin-top: 25px;
    font-style: italic;
    padding: 20px;
    background: rgba(0, 255, 255, 0.08);
    border-radius: 15px;
    border-left: 4px solid rgba(0, 255, 255, 0.6);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.floating-icons {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.float-icon {
    position: absolute;
    font-size: 2em;
    opacity: 0.3;
    animation: float-random 15s infinite;
}

@keyframes float-random {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    25% {
        transform: translate(50px, -50px) rotate(90deg);
    }
    50% {
        transform: translate(-30px, 30px) rotate(180deg);
    }
    75% {
        transform: translate(40px, -20px) rotate(270deg);
    }
}

.navigation {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 70px;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 15px;
    background: linear-gradient(135deg, rgba(0, 255, 255, 0.4), rgba(0, 200, 200, 0.4));
    border: 4px solid #00ffff;
    color: #00ffff;
    padding: 22px 55px;
    font-size: 1.5em;
    cursor: pointer;
    border-radius: 60px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    box-shadow: 
        0 8px 30px rgba(0, 255, 255, 0.5),
        inset 0 0 20px rgba(0, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.nav-btn:hover::before {
    width: 400px;
    height: 400px;
}

.nav-btn:hover:not(:disabled) {
    background: linear-gradient(135deg, #00ffff, #00ccff);
    color: #000000;
    transform: translateY(-8px) scale(1.08);
    box-shadow: 
        0 15px 50px rgba(0, 255, 255, 0.7),
        0 0 40px rgba(0, 255, 255, 1),
        inset 0 0 30px rgba(255, 255, 255, 0.3);
}

.nav-btn:active:not(:disabled) {
    transform: translateY(-4px) scale(1.04);
}

.nav-btn:disabled {
    opacity: 0.2;
    cursor: not-allowed;
    transform: none;
}

.arrow {
    font-size: 1.3em;
    transition: transform 0.4s;
    display: inline-block;
}

.nav-btn:hover .arrow {
    transform: scale(1.5);
    animation: arrow-bounce 0.6s infinite;
}

@keyframes arrow-bounce {
    0%, 100% { transform: translateX(0) scale(1.5); }
    50% { transform: translateX(5px) scale(1.5); }
}

@media (max-width: 1200px) {
    .presentation-area {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .monitor {
        width: 400px;
        height: 280px;
    }

    .keyboard {
        width: 450px;
    }

    h1 { font-size: 2.8em; }
    h2 { font-size: 2.2em; }
    .content { font-size: 1.3em; }
    .extra-info { font-size: 1.15em; }
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    .content-section {
        padding: 40px;
        min-height: 450px;
    }

    .monitor {
        width: 320px;
        height: 220px;
    }

    .keyboard {
        width: 350px;
        height: 80px;
    }

    .key {
        height: 40px;
    }

    h1 { font-size: 2.2em; }
    h2 { font-size: 1.8em; }
    .content { font-size: 1.15em; }
    .extra-info { font-size: 1em; }
    .emoji { font-size: 4.5em; }
    .nav-btn {
        padding: 18px 40px;
        font-size: 1.2em;
    }
    .counter { font-size: 1.8em; }
}