/* ================================
   ОСНОВНЫЕ НАСТРОЙКИ
================================ */

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    background-color: #0b0b0b;
    color: #f5f5f5;
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;

    animation: pageAppear 1s ease forwards;
}


/* ================================
   АНИМАЦИЯ ПОЯВЛЕНИЯ СТРАНИЦЫ
================================ */

@keyframes pageAppear {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}


/* ================================
   HEADER
================================ */

header {
    background-color: #0b0b0b;
    padding: 70px 20px 40px;

    border-bottom: 1px solid #333;

    animation: slideDown 1s ease forwards;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

header h1 {
    margin: 0;

    font-size: 70px;
    font-weight: 400;
    letter-spacing: 12px;

    text-transform: uppercase;
}


/* ================================
   NAVIGATION
================================ */

nav {
    padding: 0;
    margin: 0;

    background-color: #0b0b0b;
}

nav ul {
    list-style-type: none;

    margin: 0;
    padding: 0;

    display: flex;
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;

    border-bottom: 1px solid #333;
}

nav ul li {
    margin: 0;
}

nav ul li a {
    display: block;

    padding: 22px 30px;

    color: #f5f5f5;
    background-color: transparent;

    text-decoration: none;

    font-family: Arial, Helvetica, sans-serif;
    font-size: 13px;

    letter-spacing: 2px;
    text-transform: uppercase;

    border: none;

    transition:
            color 0.4s ease,
            background-color 0.4s ease,
            transform 0.4s ease,
            letter-spacing 0.4s ease;
}


/* Наведение */

nav ul li a:hover {
    color: #000;
    background-color: #f5f5f5;

    letter-spacing: 3px;

    transform: translateY(-2px);
}


/* Нажатие */

nav ul li a:active {
    transform: scale(0.96);
}


/* ================================
   MAIN
================================ */

main {
    max-width: 1100px;

    margin: 70px auto;

    padding: 0 25px;
}


/* ================================
   SECTIONS
================================ */

section#Kast1,
section#Kast2,
section#Kast3,
section#Kast4,
section#Kast5,
section#Kast6,
section#Kast7,
section#Kast8 {

    margin: 30px 0;
    padding: 50px;

    background-color: #111;

    border: 1px solid #333;

    text-align: center;

    transition:
            transform 0.5s ease,
            border-color 0.5s ease,
            background-color 0.5s ease;

    animation: sectionAppear 1s ease forwards;
}


/* Hover для блоков */

section#Kast1:hover,
section#Kast2:hover,
section#Kast3:hover,
section#Kast4:hover,
section#Kast5:hover,
section#Kast6:hover,
section#Kast7:hover,
section#Kast8:hover {

    transform: translateY(-5px);

    border-color: #777;

    background-color: #151515;
}


@keyframes sectionAppear {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* ================================
   ЗАГОЛОВКИ
================================ */

h2 {
    margin-bottom: 25px;

    font-size: 38px;
    font-weight: 300;

    letter-spacing: 5px;
    text-transform: uppercase;
}

h3 {
    font-size: 24px;
    font-weight: 300;

    letter-spacing: 4px;
    text-transform: uppercase;
}

p {
    color: #aaa;

    font-size: 16px;
    line-height: 1.8;

    letter-spacing: 1px;
}


/* ================================
   IMAGE
================================ */

section img {
    max-width: 100%;
    width: 600px;

    display: block;

    margin: 30px auto;

    filter: grayscale(100%);

    transition:
            filter 0.7s ease,
            transform 0.7s ease;
}


/* При наведении картинка становится цветной */

section img:hover {
    filter: grayscale(0%);

    transform: scale(1.02);
}


/* ================================
   FOOTER
================================ */

footer {
    width: 100%;

    padding: 35px 10px;

    background-color: #0b0b0b;

    border-top: 1px solid #333;

    color: #777;

    font-size: 12px;

    letter-spacing: 3px;
    text-transform: uppercase;
}


/* ================================
   МОБИЛЬНАЯ ВЕРСИЯ
================================ */

@media (max-width: 700px) {

    header {
        padding: 50px 15px 30px;
    }

    header h1 {
        font-size: 40px;
        letter-spacing: 7px;
    }

    nav ul {
        flex-direction: column;
    }

    nav ul li a {
        padding: 18px;
    }

    main {
        margin: 40px auto;
        padding: 0 15px;
    }

    section#Kast1,
    section#Kast2,
    section#Kast3,
    section#Kast4,
    section#Kast5,
    section#Kast6,
    section#Kast7,
    section#Kast8 {
        padding: 30px 20px;
    }

    h2 {
        font-size: 27px;
    }
}
/* ================================
   PAGE TRANSITION
================================ */

#page-transition {

    position: fixed;

    top: 0;
    left: 0;

    width: 100%;
    height: 100%;

    background-color: #000;

    z-index: 9999;

    pointer-events: none;

    opacity: 0;

    transition: opacity 0.5s ease;
}

#page-transition.active {
    opacity: 1;
}