/* Základní nastavení */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f5f7fa;
    color: #222;
    line-height: 1.6;
}


/* Navigace */

header {
    background: #111827;
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar {
    max-width: 1100px;
    margin: auto;
    padding: 18px 25px;

    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: #38bdf8;
    font-size: 25px;
}

.nav-links {
    display: flex;
    gap: 25px;
    list-style: none;
}

.nav-links a {
    color: white;
    text-decoration: none;
    transition: 0.3s;
}

.nav-links a:hover {
    color: #38bdf8;
}


/* Úvodní sekce */

.hero {
    min-height: 90vh;

    display: flex;
    justify-content: center;
    align-items: center;

    text-align: center;

    padding: 40px 20px;

    background:
        linear-gradient(
            135deg,
            #0f172a,
            #1e3a8a
        );

    color: white;
}

.hero-content {
    max-width: 700px;
}

.small-text {
    color: #38bdf8;
    font-weight: bold;
    margin-bottom: 10px;
}

.hero h2 {
    font-size: 60px;
    line-height: 1.1;
    margin-bottom: 20px;
}

.hero p {
    font-size: 19px;
    color: #dbeafe;
    margin-bottom: 30px;
}


/* Tlačítka */

.button,
button {
    display: inline-block;

    background: #38bdf8;
    color: #082f49;

    border: none;
    border-radius: 8px;

    padding: 13px 25px;

    font-size: 16px;
    font-weight: bold;

    text-decoration: none;
    cursor: pointer;

    transition: 0.3s;
}

.button:hover,
button:hover {
    background: #7dd3fc;
    transform: translateY(-2px);
}


/* Obecné sekce */

.section {
    max-width: 1100px;
    margin: auto;
    padding: 90px 25px;
    text-align: center;
}

.section h2 {
    font-size: 38px;
    margin-bottom: 20px;
}

.section > p {
    max-width: 650px;
    margin: auto;
}


/* Karty */

.dark {
    max-width: none;
    background: #111827;
    color: white;
}

.cards {
    max-width: 1100px;
    margin: 40px auto 0;

    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.card {
    background: #1f2937;
    padding: 35px 25px;
    border-radius: 12px;

    transition: 0.3s;
}

.card:hover {
    transform: translateY(-8px);
    background: #263449;
}

.card h3 {
    color: #38bdf8;
    margin-bottom: 10px;
}


/* Kontakt */

.contact {
    text-align: center;
}

form {
    max-width: 600px;
    margin: 30px auto 0;

    display: flex;
    flex-direction: column;
    gap: 15px;
}

input,
textarea {
    width: 100%;

    padding: 15px;

    border: 1px solid #d1d5db;
    border-radius: 8px;

    font-family: inherit;
    font-size: 16px;

    outline: none;
}

input:focus,
textarea:focus {
    border-color: #38bdf8;
}

textarea {
    min-height: 150px;
    resize: vertical;
}


/* Patička */

footer {
    background: #0f172a;
    color: #94a3b8;

    text-align: center;
    padding: 25px;
}


/* Mobilní zařízení */

@media (max-width: 700px) {

    .navbar {
        flex-direction: column;
        gap: 15px;
    }

    .nav-links {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .hero h2 {
        font-size: 40px;
    }

    .hero p {
        font-size: 16px;
    }

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

    .section {
        padding: 60px 20px;
    }
}