:root {
    --kaash-green: #7ED321;
    --kaash-dark: #0a0a0a;
    --kaash-gray: #1a1a1a;
    --kaash-blue: #00D4FF;
    --kaash-purple: #9B59B6;
    --kaash-neon-pink: #FF2A92;
    --kaash-cyber-yellow: #F7FF00;
    --gradient-tech: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-energy: linear-gradient(135deg, #7ED321 0%, #00D4FF 100%);
    --gradient-neon: linear-gradient(135deg, #FF2A92 0%, #F7FF00 50%, #00D4FF 100%);
    --gradient-cyber: linear-gradient(45deg, #7ED321, #00D4FF, #FF2A92, #F7FF00);
    --shadow-glow: 0 0 20px rgba(126, 211, 33, 0.3);
    --shadow-neon: 0 0 30px rgba(255, 42, 146, 0.4);
    --shadow-cyber: 0 0 40px rgba(0, 212, 255, 0.3);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Rajdhani', sans-serif;
    background: var(--kaash-dark);
    color: #ffffff;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(126, 211, 33, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 42, 146, 0.05) 0%, transparent 50%);
    pointer-events: none;
    z-index: -2;
}

.stars, .twinkling {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    display: block;
    z-index: -1;
}

.stars {
    background: #000 url('data:image/svg+xml;base64,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') repeat;
    animation: move-twink-back 200s linear infinite;
}

.twinkling {
    background: transparent url('data:image/svg+xml;base64,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') repeat;
    animation: move-twink-back 100s linear infinite;
}

@keyframes move-twink-back {
    from { background-position: 0 0; }
    to { background-position: -10000px 5000px; }
}


.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(126, 211, 33, 0.2);
    z-index: 1000;
    transition: all 0.3s ease;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 40px;
    filter: drop-shadow(var(--shadow-glow));
    transition: transform 0.3s ease;
}

.logo img:hover {
    transform: scale(1.1) rotate(5deg);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--kaash-green);
    text-shadow: 0 0 10px var(--kaash-green);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-energy);
    transition: width 0.3s ease;
}

.nav-link:hover::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background-color: var(--kaash-green);
    margin: 3px 0;
    transition: 0.3s;
}

.hero {
    position: relative;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    overflow: hidden;
}

.hero-logo {
    position: absolute;
    top: 15%;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1;
    filter: drop-shadow(0 0 40px rgba(126, 211, 33, 0.8));
}

.hero-logo img {
    width: 300px;
    height: auto;
    animation: float 6s ease-in-out infinite, glow-pulse 3s ease-in-out infinite alternate;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes glow-pulse {
    0% { filter: drop-shadow(0 0 40px rgba(126, 211, 33, 0.8)); }
    100% { filter: drop-shadow(0 0 60px rgba(126, 211, 33, 1)) drop-shadow(0 0 80px rgba(0, 212, 255, 0.5)); }
}

.hero-content {
    z-index: 2;
    max-width: 800px;
    margin-top: 200px;
    padding: 2rem;
}

.glitch {
    font-family: 'Orbitron', monospace;
    font-size: 4rem;
    font-weight: 900;
    text-transform: uppercase;
    color: #ffffff;
    text-shadow: 
        0 0 20px var(--kaash-green),
        0 0 40px var(--kaash-green),
        0 0 60px var(--kaash-green);
    animation: glitch 2s infinite;
    margin-bottom: 1rem;
}

@keyframes glitch {
    0%, 100% { transform: translate(0); }
    20% { transform: translate(-2px, 2px); }
    40% { transform: translate(-2px, -2px); }
    60% { transform: translate(2px, 2px); }
    80% { transform: translate(2px, -2px); }
}

.hero-tagline {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--kaash-green);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.typing-text {
    border-right: 3px solid var(--kaash-green);
    animation: typing 4s steps(40) infinite, blink-caret 0.75s step-end infinite;
    white-space: nowrap;
    overflow: hidden;
}

@keyframes typing {
    0%, 90%, 100% { width: 100%; }
    10% { width: 0; }
}

@keyframes blink-caret {
    from, to { border-color: transparent; }
    50% { border-color: var(--kaash-green); }
}

.hero-description {
    font-size: 1.2rem;
    margin-bottom: 3rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.6;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    position: relative;
    padding: 1rem 2rem;
    text-decoration: none;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border: none;
    cursor: pointer;
    overflow: hidden;
    transition: all 0.3s ease;
    border-radius: 5px;
    display: inline-block;
    background: transparent;
}

.btn-primary {
    background: var(--gradient-energy);
    color: var(--kaash-dark);
    box-shadow: var(--shadow-glow);
}

.btn-secondary {
    border: 2px solid var(--kaash-green);
    color: var(--kaash-green);
}

.btn-outline {
    border: 2px solid var(--kaash-blue);
    color: var(--kaash-blue);
}

.btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 40px rgba(126, 211, 33, 0.5);
    filter: brightness(1.1);
}

.btn-primary:hover {
    box-shadow: var(--shadow-glow), var(--shadow-cyber);
}

.btn-secondary:hover {
    box-shadow: var(--shadow-neon);
    border-color: var(--kaash-neon-pink);
    color: var(--kaash-neon-pink);
}

.btn-outline:hover {
    box-shadow: var(--shadow-cyber);
    background: rgba(0, 212, 255, 0.1);
}

.btn-effect {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.6s ease;
}

.btn:hover .btn-effect {
    left: 100%;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    border-radius: inherit;
    padding: 2px;
    background: var(--gradient-cyber);
    background-size: 200% 200%;
    animation: gradientShift 3s ease-in-out infinite;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.3s ease;
}

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

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    color: var(--kaash-green);
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    animation: scroll-bounce 2s infinite;
}

@keyframes scroll-bounce {
    0%, 100% { transform: rotate(45deg) translateY(0); }
    50% { transform: rotate(45deg) translateY(10px); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 5rem 0;
}

h2 {
    font-family: 'Orbitron', monospace;
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--kaash-green);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 2rem;
}

.feature-list {
    list-style: none;
    margin-top: 2rem;
}

.feature-list li {
    padding: 1rem 0;
    border-bottom: 1px solid rgba(126, 211, 33, 0.2);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.feature-icon {
    font-size: 1.5rem;
    filter: drop-shadow(0 0 10px var(--kaash-green));
}

.about-visual {
    display: flex;
    justify-content: center;
}

.tech-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 300px;
}

.tech-item {
    background: linear-gradient(135deg, rgba(126, 211, 33, 0.1), rgba(0, 212, 255, 0.1));
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    border: 1px solid rgba(126, 211, 33, 0.3);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.tech-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow);
}

.pulse-dot {
    width: 10px;
    height: 10px;
    background: var(--kaash-green);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.5); opacity: 0.5; }
}

.videos {
    background: linear-gradient(135deg, rgba(10, 10, 10, 0.8), rgba(26, 26, 26, 0.8));
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.video-placeholder {
    background: var(--gradient-tech);
    border-radius: 15px;
    padding: 3rem;
    text-align: center;
    color: white;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.video-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.topic-card {
    background: linear-gradient(135deg, rgba(126, 211, 33, 0.1), rgba(0, 212, 255, 0.1));
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    border: 1px solid rgba(126, 211, 33, 0.3);
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.topic-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: conic-gradient(from 0deg, var(--kaash-green), var(--kaash-blue), var(--kaash-neon-pink), var(--kaash-cyber-yellow), var(--kaash-green));
    animation: rotate 4s linear infinite;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.topic-card::after {
    content: '';
    position: absolute;
    inset: 2px;
    background: linear-gradient(135deg, rgba(10, 10, 10, 0.9), rgba(26, 26, 26, 0.9));
    border-radius: 13px;
    z-index: -1;
}

.topic-card:hover {
    transform: translateY(-15px) rotateY(8deg) rotateX(5deg);
    box-shadow: var(--shadow-glow), var(--shadow-neon), var(--shadow-cyber);
}

.topic-card:hover::before {
    opacity: 1;
}

.topic-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 20px var(--kaash-green));
}

.topic-card h3 {
    color: var(--kaash-green);
    margin-bottom: 1rem;
    font-family: 'Orbitron', monospace;
}

.topic-stats {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(126, 211, 33, 0.3);
}

.stat {
    background: var(--gradient-energy);
    color: var(--kaash-dark);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.contact {
    background: var(--kaash-gray);
    text-align: center;
}

.contact-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.8);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.social-link {
    display: inline-block;
    padding: 1rem 2rem;
    background: var(--gradient-energy);
    color: var(--kaash-dark);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.social-link:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: var(--shadow-glow);
}

.footer {
    background: var(--kaash-dark);
    padding: 2rem 0;
    border-top: 1px solid rgba(126, 211, 33, 0.2);
}

.footer-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.footer-logo img {
    height: 30px;
    filter: grayscale(1) brightness(0.5);
    transition: all 0.3s ease;
}

.footer-logo img:hover {
    filter: none;
    transform: scale(1.1);
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background: rgba(10, 10, 10, 0.95);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        backdrop-filter: blur(10px);
        padding: 2rem 0;
        height: calc(100vh - 70px);
        overflow-y: auto;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-menu li {
        margin: 1.5rem 0;
    }

    .hero {
        padding: 0 1rem;
        min-height: 100vh;
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
        padding: 1rem;
    }

    .glitch {
        font-size: clamp(2rem, 8vw, 3rem);
        line-height: 1.2;
        margin-bottom: 1rem;
        word-break: break-word;
        hyphens: auto;
    }

    .hero-tagline {
        font-size: clamp(0.9rem, 4vw, 1.2rem);
        margin-bottom: 1.5rem;
        word-break: break-word;
    }

    .typing-text {
        white-space: normal;
        word-wrap: break-word;
        border-right: none;
        animation: none;
    }

    .hero-description {
        font-size: clamp(1rem, 4vw, 1.1rem);
        margin-bottom: 2rem;
        line-height: 1.5;
        padding: 0 1rem;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
        width: 100%;
    }

    .btn {
        width: 100%;
        max-width: 280px;
        padding: 1.2rem;
        font-size: 0.9rem;
    }

    h2 {
        font-size: clamp(1.8rem, 6vw, 2.2rem);
        margin-bottom: 2rem;
        word-break: break-word;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .about-text p {
        font-size: 1rem;
        line-height: 1.7;
    }

    .feature-list li {
        padding: 0.8rem 0;
        flex-direction: column;
        text-align: center;
        gap: 0.5rem;
    }

    .feature-icon {
        font-size: 1.2rem;
    }

    .tech-grid {
        grid-template-columns: 1fr 1fr;
        gap: 1rem;
        max-width: 100%;
    }

    .tech-item {
        padding: 1.5rem 1rem;
        font-size: 0.9rem;
    }

    .video-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .topics-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .topic-card {
        padding: 1.5rem;
        text-align: center;
    }

    .topic-icon {
        font-size: 2.5rem;
    }

    .social-links {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }

    .social-link {
        width: 100%;
        max-width: 250px;
        padding: 1rem;
        text-align: center;
    }


    /* Optimalize animace na mobilu */
    * {
        animation-duration: 0.6s !important;
        transition-duration: 0.3s !important;
    }

    .stars, .twinkling {
        animation-duration: 300s !important;
    }

    /* Mobile optimalizace hero sekce */
    .hero-logo {
        top: 10%;
        transform: translateX(-50%) scale(0.7);
    }
    
    .hero-logo img {
        width: 200px;
        animation-duration: 4s;
    }
    
    .hero-content {
        margin-top: 150px;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 1rem;
    }

    .hero-content {
        padding: 1rem;
    }

    .glitch {
        font-size: 2rem;
    }

    .container {
        padding: 0 1rem;
    }

    section {
        padding: 3rem 0;
    }
}