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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #050505 0%, #0d0d0d 100%);
    color: #d8d8d8;
    line-height: 1.6;
    min-height: 100vh;
}

header {
    background-color: #000000;
    padding: 3rem 2rem;
    text-align: center;
    border-bottom: 2px solid #505050;
}

header h1 {
    font-size: 2.5rem;
    color: #b0b0b0;
    margin-bottom: 0.5rem;
    letter-spacing: 2px;
}

.subtitle {
    color: #808080;
    font-size: 1.1rem;
    font-weight: 300;
}

nav {
    background-color: #0a0a0a;
    padding: 1rem 2rem;
    display: flex;
    gap: 2rem;
    justify-content: center;
    border-bottom: 1px solid #505050;
}

nav a {
    color: #808080;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-left: 2px solid transparent;
    border-right: 2px solid transparent;
}

nav a:hover {
    border-left: 2px solid #808080;
    border-right: 2px solid #808080;
    color: #b8b8b8;
}

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

.hero {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background-color: #151515;
    border-left: 4px solid #505050;
    border-right: 4px solid #303030;
}

.hero h2 {
    font-size: 2rem;
    color: #b0b0b0;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.1rem;
    color: #999999;
}

.blocks {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.block {
    background-color: #151515;
    padding: 2rem;
    border-left: 4px solid #505050;
    border-top: 1px solid #303030;
    border-right: 1px solid #1a1a1a;
    border-bottom: 1px solid #1a1a1a;
}

.block h3 {
    color: #b0b0b0;
    margin-bottom: 1rem;
    font-size: 1.4rem;
}

.block p {
    color: #a8a8a8;
    text-align: justify;
    line-height: 1.8;
}

.odkaz {
    display: inline;
}

.odkaz a {
    color: #a8a8a8;
    text-decoration: none;
    border-bottom: 1px solid #505050;
}

.odkaz a:hover {
    color: #d0d0d0;
    border-bottom: 1px solid #808080;
}

footer {
    background-color: #000000;
    color: #606060;
    text-align: center;
    padding: 2rem;
    margin-top: 3rem;
    border-top: 2px solid #505050;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    nav {
        flex-direction: column;
        gap: 0.5rem;
    }

    nav a {
        text-align: center;
    }

    .blocks {
        grid-template-columns: 1fr;
    }

    main {
        padding: 1rem;
    }
}