/* style.css */
html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 1rem;
    background-color: #1a202c;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    color: #ccc;
}

h3 {
    font-weight: normal;
}

.main-container {
    max-width: 800px;
    margin: 0 auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
}

.background-top, .background-bottom {
    position: fixed;
    left: 0;
    right: 0;
    height: 7rem;
    background-color: #2d3748;
}

.background-top {
    top: 0;
}

.background-bottom {
    bottom: 0;
}

header {
    /*background-color: #2d3748;*/
    color: #ccc;
    padding: 0 40px;
    height: 7rem;
    text-align: center;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

main {
    flex-grow: 1;
    max-width: 96%;
    padding: 40px 40px;
    margin: 0 0;
    border-radius: 20px;
    position: relative;
    z-index: 1;
    /*background-color: #04484D;*/
    background-color: #63b3ed;
    border: 1px solid #ccc;
}

footer {
    background-color: #2d3748;
    color: #a0aec0;
    height: 7rem;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.b {
    color: coral;
}

.c {
    color: gold;
}

header .logo {
    font-size: 3rem;
    margin-top: -8px;
}

header h1 a {
    /*color: #ccc;*/
    /*color: #fff;*/
    text-decoration: none;
}

nav {width: 100%;
}

nav ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    gap: 30px;
}

nav ul li {
    margin: 0;
    font-size: 2rem;
}

nav ul li a {
    /*color: #a0aec0;*/
    color: #63b3ed;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.15s ease;
}

nav ul li a:hover {
    /*color: #63b3ed;*/
    /*color: #a0aec0;*/

    text-shadow:
            0.3px 0.3px 0 currentColor,
            -0.3px -0.3px 0 currentColor,
            -0.3px 0.3px 0 currentColor,
            0.3px -0.3px 0 currentColor;
}

h1 {
    color: #ccc;
    font-size: 2.6rem;
    font-weight: normal;
    margin: 0 0 1rem;
}

h2 {
    color: #ccc;
    font-size: 2rem;
    font-weight: normal;
    margin: 0 0 1rem;
}

h3 {
    color: #ccc;
    font-size: 1.6rem;
    margin: 0 0 1rem;
}

p {
    color: #e2e8f0;
    line-height: 1.8;
    margin-bottom: 20px;
}

a {
    color: #63b3ed;
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: #90cdf4;
}

li {
    margin-bottom: 1em;
}

/* ... предыдущие стили остаются без изменений ... */

/* Анимации */
@keyframes fadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

@keyframes expandMain {
    0% {
        padding: 40px 40px;
        margin: 0 0;
    }
    100% {
        padding: 60px 40px;
        margin: -20px 0;
    }
}

@keyframes changeBackground {
    /*0% { background-color: #04484D; }*/
    /*100% { background-color: #023033; }*/
    0% { background-color: #63b3ed; }
    100% { background-color: #034473; }
}

/* Применение анимаций */
.fade-in-1 {
    opacity: 0;
    animation: fadeIn 0.8s ease-in forwards;
}

main.fade-in-2 {
    animation: expandMain 0.3s ease-in forwards;
    animation-delay: .3s; /* Начинается после завершения первой анимации */
}

main.fade-in-3 {
    animation: changeBackground 0.3s ease-in forwards;
    animation-delay: 0.5s; /* Начинается после завершения второй анимации */
}

/* Чтобы анимации не конфликтовали друг с другом */
main.fade-in-2.fade-in-3 {
    animation:
            expandMain 0.3s ease-in forwards 0.5s,
            changeBackground 0.3s ease-in forwards 0.8s;
}

/* Отключение анимаций для мобильных устройств */
@media (max-width: 768px) {

    header {
        height: 2rem;
        padding: 0 40px 1.5em 40px;
    }
    nav ul li {
        font-size: 1.6rem;
    }
    footer {
        height: 2rem;
        padding: 1em 40px 0 40px;
    }

    .fade-in-1 {
        opacity: 1;
        animation: none;
    }

    main.fade-in-2,
    main.fade-in-3,
    main.fade-in-2.fade-in-3 {
        max-width: 96%;
        animation: none;
        padding: 20px 10px;
        margin: -20px 0;
        background-color: #034473;
    }
}

/* Fallback для браузеров без поддержки анимаций */
@supports not (animation-name: fadeIn) {
    .fade-in-1 {
        opacity: 1;
    }

    main, .fade-in-2, .fade-in-3 {
        padding: 60px 40px;
        margin: -20px 0;
        background-color: #034473;
    }
}