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

html, body {
    height: 100%;
}

body {
    font-size: 18px;
    font-family: sans-serif;
    margin: 0;
    padding: 0;
    overflow: auto;
}

.content {
    min-height: 100%;
    display: flex;
    flex-direction: column;
}

a {
    text-decoration: none;
}

a:hover {
    color: white;
}

a:visited,
a:link {
    color: #dbe2ef;
}

.header {
    position: fixed;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    height: 90px;
    background: #112d4e;
    color: #dbe2ef;
    top: 0;
    left: 0;
    padding: 0 20px;
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    width: 60px;
    height: 60px;
    border-radius: 15px;
}

.header h1 {
    font-size: 1.5em;
    margin-left: 20px;
}

.menu {
    display: flex;
    align-items: center;
    list-style: none;
}

.menu li {
    margin-left: 20px;
    position: relative;
}

.features-menu {
    display: none;
    flex-direction: column;
    background: #b2d6ff;
    border-radius: 5px;
    position: absolute;
    top: 40px;
    left: 0;
    z-index: 1;
    padding: 10px 0;
}

.features-menu a {
    color: #112d4e;
}

.dropdown:hover .features-menu {
    display: flex;
}

.features-menu li {
    padding: 10px 20px;
    text-align: center;
    border-bottom: 1px solid #fff;
}

.features-menu li:last-child {
    border-bottom: none;
}

.sad {
    flex: 1;
    padding-top: 150px;
    color: #00264d;
    text-align: center;
    padding-bottom: 110px;
}

.footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background-color: #00264d;
    color: #b2d6ff;
}

.social-container {
    display: flex;
    align-items: center;
}

.social {
    display: flex;
    align-items: center;
    margin-right: 20px;
}

.social h2, .social h1 {
    margin-left: 10px;
}

.contact-info {
    text-align: right;
    margin-left: auto;
}

/* Мобильные устройства до 400px */
@media (max-width: 400px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
        padding: 10px;
        height: auto;
    }

    .logo {
        display: flex;
        align-items: center;
        margin-bottom: 10px;
    }

    .logo img {
        width: 45px;
        height: 45px;
        margin-left: 0;
        margin-right: 10px;
    }

    .header h1 {
        margin: 0;
        font-size: 1.2em;
        white-space: nowrap;
    }

    .menu {
        display: flex;
        flex-wrap: wrap;
        justify-content: flex-start;
        width: 100%;
        margin-left: 0;
        gap: 5px;
        padding-left: 10px;
        font-size: smaller;
    }

    .menu > li {
        margin-right: 0;
    }

    .dropdown .features-menu {
        position: absolute;
        top: 100%;
        left: 0;
        background: #b2d6ff;
        border-radius: 5px;
        display: none;
        flex-direction: column;
        justify-content: center;
        z-index: 1000;
        padding: 10px 0;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    }

    .dropdown:hover .features-menu {
        display: flex;
        flex-direction: column;
    }

    .sad h1 {
        font-size: smaller;
    }

    .sad img {
        width: 90%;
        height: auto;
    }

    .footer {
        flex-direction: column;
        text-align: center;
        font-size: smaller;
        padding-bottom: 120px;
        flex-shrink: 0;
    }

    .contact-info {
        text-align: center;
        margin-top: 10px;
    }
}

/* Устройства от 400px до 767px */
@media (min-width: 400px) and (max-width: 767px) {
    .header {
        flex-direction: column;
        align-items: flex-start;
        padding: 10px;
        height: auto;
    }

    .logo {
        display: flex;
        align-items: center;
        margin-bottom: 10px;
    }

    .logo img {
        width: 45px;
        height: 45px;
    }

    .header h1 {
        margin-left: 10px;
        font-size: 1em;
        white-space: nowrap;
    }

    .menu {
        flex-wrap: wrap;
        justify-content: flex-start;
        width: 100%;
        gap: 8px;
        font-size: 0.85em;
        padding-left: 10px;
    }

    .dropdown .features-menu {
        position: static;
        background: #b2d6ff;
        display: none;
    }

    .dropdown:hover .features-menu {
        display: flex;
        flex-direction: column;
    }

    .sad img {
        width: 90%;
        height: auto;
    }

    .footer {
        flex-direction: column;
        text-align: center;
        font-size: smaller;
        padding-bottom: 120px;
        flex-shrink: 0;
    }

    .contact-info {
        text-align: center;
        margin-top: 10px;
    }
}

/* Планшеты */
@media (min-width: 768px) and (max-width: 1023px) {
    .text-container h2 {
        font-size: 2em;
    }

    .footer {
        margin-top: 350px;
    }

    .sad img {
        width: 80%;
        height: auto;
    }
}

/* Маленькие десктопы */
@media (min-width: 1024px) and (max-width: 1365px) {
    .text-container h2 {
        font-size: 2.5em;
    }
}

/* Большие экраны */
@media (min-width: 1366px) {
    .text-container h2 {
        font-size: 3em;
    }
}