:root {
    --rsys-mark: #e6380d;
    --rsys-mark-dark: #ca2800;
    --rsys-glass: rgba(255, 255, 255, 0.08);
    --rsys-glass-strong: rgba(255, 255, 255, 0.16);
    --rsys-glass-border: rgba(255, 255, 255, 0.25);
    --rsys-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    --rsys-font: "Roboto", sans-serif;
}

*,
pre {
    font-family: var(--rsys-font);
}

html {
    scroll-behavior: smooth;
}

.nav-shell {
    position: absolute;
    z-index: 1000;
}

nav {
    margin: 0 auto !important;
}

.navbar-collapse,
.bg-menu {
    transition: 1s;
}

.bg-menu {
    background: var(--rsys-glass);
    border: 1px solid var(--rsys-glass-border);
    box-shadow: var(--rsys-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.nav-link {
    margin-right: 10px;
}

.nav-link:hover {
    text-decoration: underline;
}

.btn-mark,
.bg-mark {
    background-color: var(--rsys-mark) !important;
}

.btn-mark {
    box-shadow: var(--rsys-shadow), inset 0 1px 0 rgba(255, 255, 255, 0.2);
    transition: 0.3s;
}

.btn-mark:hover {
    background-color: var(--rsys-mark-dark) !important;
    border-color: #ffffff;
}

.language-switcher {
    position: relative;
}

.language-toggle,
.language-option {
    display: flex;
    align-items: center;
}

.language-toggle {
    gap: 8px;
    min-height: 40px;
    padding: 7px 12px;
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    font-size: 14px;
    line-height: 1;
    transition: 0.2s;
}

.language-toggle:hover,
.language-toggle:focus {
    border-color: #ffffff;
    background: var(--rsys-glass-strong);
}

.language-toggle img,
.language-option img {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    object-fit: cover;
}

.language-menu {
    min-width: 210px;
    max-height: 320px;
    overflow-y: auto;
    padding: 8px;
    border-radius: 8px;
}

.language-option {
    gap: 10px;
    min-height: 40px;
    border-radius: 6px;
}

.language-option.active,
.language-option:active {
    background-color: var(--rsys-mark);
}

header {
    height: 920px;
    padding-top: 30%;
    background-image: url("image/head.webp");
    background-position: center center;
    background-size: cover;
    color: #ffffff;
}

header h1 {
    min-height: 125px;
    margin-top: 10px;
    font-size: 52px;
    font-weight: 200;
}

.itag {
    position: relative;
    height: 22px;
    margin-top: -4px;
    margin-right: 6px;
}

section {
    padding-top: 100px;
    padding-bottom: 100px;
}

section h1,
h2,
h3 {
    font-weight: 200;
}

section h3 {
    margin: 0;
    padding: 0;
    font-size: 20px;
}

.bg-case,
.bg-pytania,
.bg-wdrozenia {
    background-position: center center;
    background-size: cover;
}

.bg-case {
    background-image: url("image/case.webp");
}

.bg-pytania {
    background-image: url("image/pytania.webp");
}

.bg-wdrozenia {
    background-image: url("image/wdrozenia.webp");
}

.text-justify {
    text-align: justify;
}

.logo-slider img {
    height: 24px;
    margin-left: 30px;
}

.logo-track,
.logo-track2,
.logo-track3,
.logo-track4,
.logo-track5 {
    width: max-content;
    animation-name: scroll;
    animation-timing-function: linear;
    animation-iteration-count: infinite;
}

.logo-track,
.logo-track4,
.logo-track5 {
    animation-duration: 80s;
}

.logo-track2 {
    animation-duration: 85s;
}

.logo-track3 {
    animation-duration: 95s;
}

@keyframes scroll {
    from {
        transform: translateX(0);
    }

    to {
        transform: translateX(-50%);
    }
}

.bg-case img {
    position: relative;
    top: 0;
    opacity: 0.8;
    box-shadow: var(--rsys-shadow);
    transition: 0.4s;
}

.bg-case img:hover {
    top: -5px;
    opacity: 1;
}

.accordion-item {
    overflow: hidden;
    margin-bottom: 10px;
    border: none;
    border-radius: 10px;
}

.accordion-collapse {
    transition: height 0.4s ease, opacity 0.15s ease;
}

.accordion-body {
    opacity: 0;
    transform: translateY(-6px);
    transition: all 0.15s ease;
}

.accordion-collapse.show .accordion-body {
    opacity: 1;
    transform: translateY(0);
}

.accordion-button {
    transition: background-color 0.1s ease, box-shadow 0.1s ease;
}

.accordion-button:not(.collapsed) {
    background-color: var(--rsys-mark);
    color: #ffffff;
    box-shadow: none;
}

.dane {
    font-size: 16px;
}

.dane div {
    margin-top: 14px;
    margin-bottom: 16px;
}

.social a {
    text-decoration: none;
}

.social img {
    height: 40px;
    margin-right: 10px;
    padding: 3px;
    border: 1px solid #333333;
    border-radius: 50px;
    box-shadow: 0 0 6px 2px rgba(0, 0, 0, 0.2);
    opacity: 0.6;
    transition: 0.5s;
}

.social img:hover {
    opacity: 1;
}