@font-face {
    font-family: 'Rampart One';
    src: url('/font/rampart/subset-RampartOne-Regular-3ba46102f011158deddf80bc71ce7c10.woff2') format('woff2');
    font-display: swap;
}

#navbar {
    position: sticky;
    top: 0;
    z-index: 40;
    --nav-ink-strong: rgba(0, 0, 0, 0.85);
    --nav-ink-outline: rgba(0, 0, 0, 0.65);
    --nav-hover-bg: rgba(0, 0, 0, 0.045);
    --nav-active-bg: rgba(0, 0, 0, 0.055);
    --nav-radius: 14px;
    --nav-radius-lg: 16px;
    background: color-mix(in srgb, var(--text-section-bg) 40%, #ffffff);
    border-bottom: 2px solid var(--nav-ink-strong);
    box-shadow: 0 10px 22px rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(10px);
}

#navbar .navbar-brand {
    align-items: center;
}

#navbar .navbar-item,
#navbar .navbar-link {
    border-radius: var(--nav-radius);
}

#navbar .navbar-item:focus-visible,
#navbar .navbar-link:focus-visible,
#navbar a.button:focus-visible {
    outline: 3px solid var(--nav-ink-outline);
    outline-offset: 2px;
}

#navbar .navbar-item:hover,
#navbar .navbar-link:hover {
    background: transparent;
}

#navbar .navbar-burger {
    border-radius: 14px;
}

#navbar .navbar-burger:hover {
    background: var(--nav-hover-bg);
}

#navbar .navbar-burger:focus-visible {
    outline: 3px solid var(--nav-ink-outline);
    outline-offset: 2px;
}

#navbar .navbar-item.has-dropdown.is-active > .navbar-link,
#navbar .navbar-item.has-dropdown.is-active > #dropdown-menu-link {
    background: var(--nav-active-bg);
}

.nav-brand-title {
    padding-left: 0.55rem;
    padding-right: 0.75rem;
}

.nav-brand-text {
    /* Keep brand text consistent with the site's base typography. */
    font-family: Montserrat, sans-serif;
    font-weight: 800;
    font-size: 1.05rem;
    letter-spacing: 0.01em;
    color: #1f1300;
}

@media screen and (min-width: 1030px) {
    #navbar {
        min-height: 4.25rem;
    }

    #navbar .navbar-start {
        gap: 0.35rem;
    }
}

.progress.custom-width {
    width: 200px;
}

.progress.is-bright-green {
    background-color: #e6f6e7;
    border-radius: 999px;
    border: 2px solid #363636;
    box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.75);
}

.progress.is-bright-green::-webkit-progress-bar {
    background-color: #e6f6e7;
}

.progress.is-bright-green::-webkit-progress-value {
    background-color: #3db147;
}

.progress.is-bright-green::-moz-progress-bar {
    background-color: #3db147;
}

.progress.is-bright-green::-ms-fill {
    background-color: #3db147;
}

.level {
    font-family: 'Rampart One', sans-serif;
    font-size: 28px;
    font-weight: bold;
}

#navbar .navbar-item:hover {
    color: inherit;
}

#navbar .navbar-link:hover {
    color: inherit;
}

#navbar .navbar-menu.is-active {
    background: color-mix(in srgb, var(--text-section-bg) 40%, #ffffff);
    border-top: 2px solid rgba(0, 0, 0, 0.12);
    padding-top: 0.35rem;
    padding-bottom: 0.6rem;
}

#navbar .navbar-dropdown {
    border: 2px solid var(--nav-ink-strong);
    border-radius: var(--nav-radius-lg);
    background: color-mix(in srgb, var(--text-section-bg) 14%, #ffffff);
    padding: 0.4rem;
    overflow: hidden;
}

#navbar .navbar-dropdown .navbar-item {
    border-radius: 12px;
}

#navbar .navbar-dropdown .navbar-item:hover {
    background: rgba(0, 0, 0, 0.04);
}

#navbar .navbar-end .buttons {
    gap: 0.55rem;
}

#navbar .navbar-end .buttons .button {
    border: 2px solid var(--nav-ink-strong);
    border-radius: var(--nav-radius);
    box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.22);
    font-weight: 800;
    transition: transform 0.18s ease-out, box-shadow 0.18s ease-out, background-color 0.18s ease-out;
}

#navbar .navbar-end .buttons .button:hover {
    transform: translateY(-1px);
    box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.22);
}

#navbar .navbar-end .buttons .button:active {
    transform: translateY(0);
    box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.22);
}

#navbar .navbar-end .buttons .button.is-light {
    background: rgba(255, 255, 255, 0.75);
    color: #1f1300;
}

#navbar .navbar-end .buttons .button.is-dark {
    background: #1f1f1f;
    color: #ffffff;
    border-color: #000000;
}

#navbar .navbar-end .buttons .button.button-premium {
    border-color: #000000;
}

.avatar-progress-level {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.avatar-progress-link {
    text-decoration: none;
    color: inherit;
}

.avatar-progress-link:hover {
    color: inherit;
}

.avatar-progress-level img {
    object-fit: contain;
}

.progress-container {
    position: relative;
}

.level-container {
    margin-left: 0.5rem;
}

.progress-hover-wrapper {
    position: relative;
    display: inline-block;
}

.progress-hover-wrapper:hover::before {
    content: attr(data-hover) '%';
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    width: 100%;
    pointer-events: none;
}

.color-selector {
    display: flex;
    gap: 5px;
    align-items: center;
}

.color-option {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(0, 0, 0, 0.7);
    border-radius: 50%;
    cursor: pointer;
    transition: transform 0.2s;
    box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.45);
}

.color-option:hover {
    transform: scale(1.2);
}

.color-option:focus-visible {
    outline: 3px solid rgba(0, 0, 0, 0.65);
    outline-offset: 2px;
}

.color-option[data-color="#fde3ab"] {
    background-color: #fde3ab;
}

.color-option[data-color="#cbe1fd"] {
    background-color: #cbe1fd;
}

.color-option[data-color="#bde7d8"] {
    background-color: #bde7d8;
}

.color-option[data-color="#efdaef"] {
    background-color: #efdaef;
}

.color-option[data-color="#dedddd"] {
    background-color: #dedddd;
}

.lang-toggle {
    display: inline-block;
    position: relative;
    vertical-align: middle;
}

.lang-toggle input {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.lang-toggle input:focus-visible + label {
    outline: 2px solid #485fc7;
    outline-offset: 2px;
}

.lang-toggle label {
    box-sizing: border-box;
    display: flex;
    align-items: center;
    position: relative;
    width: 124px;
    background: rgba(0, 0, 0, 0.48);
    border-radius: 50px;
    cursor: pointer;
    transition: background 0.3s, box-shadow 0.3s;
    backdrop-filter: blur(8px);
    border: 2px solid rgba(0, 0, 0, 0.55);
    height: 38px;
    overflow: hidden;
}

.flag {
    z-index: 2;
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 0;
    min-width: 0;
    width: 50%;
}

.lang-flag-img {
    width: 20px;
    height: 14px;
    filter: grayscale(1) contrast(1.05);
    opacity: 0.55;
}

.lang-code {
    font-size: 0.78rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    color: rgba(255, 255, 255, 0.72);
}

.toggle {
    position: absolute;
    top: 0;
    left: 0;
    width: 50%;
    height: 100%;
    background: var(--text-section-bg, #fde3ab);
    border-radius: 999px;
    transition: transform 0.3s ease-in-out, background 0.3s;
    box-shadow: inset 2px 2px 4px rgba(0, 0, 0, 0.12),
    inset -2px -2px 4px rgba(255, 255, 255, 0.8),
    0 3px 6px rgba(0, 0, 0, 0.1);
    z-index: 1;
}

.lang-toggle input:checked + label .toggle {
    transform: translateX(100%);
}

/* Active side (highlighted) gets dark text + full-color flag. */
.lang-toggle input:not(:checked) + label .flag.ru .lang-flag-img,
.lang-toggle input:checked + label .flag.en .lang-flag-img {
    opacity: 0.95;
    filter: grayscale(0) contrast(1);
}

.lang-toggle input:not(:checked) + label .flag.ru .lang-code,
.lang-toggle input:checked + label .flag.en .lang-code {
    color: #1f1300;
}

/* Inactive side stays muted. */
.lang-toggle input:checked + label .flag.ru .lang-code,
.lang-toggle input:not(:checked) + label .flag.en .lang-code {
    color: rgba(255, 255, 255, 0.72);
}

/* SIDEBAR STYLE START */
.sidenav {
    height: 100%;
    width: 0;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #1f1f1f;
    overflow-x: hidden;
    padding-top: 70px;
    transition: 0.1s;
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.3);
}

.sidenav a {
    padding: 12px 9px;
    text-decoration: none;
    color: #fff;
    display: block;
    transition: background-color 0.3s, color 0.3s;
    font-size: 16px;
    border-radius: 8px;
    margin: 5px 5px;
    background-color: #2b2b2b;
}

.sidenav a:hover {
    color: #1f1f1f;
    background-color: #f9a826;
}

main {
    transition: margin-left .1s;
}

#courseSideNav p {
    padding: 20px 9px;
    font-weight: bold;
    font-size: 18px;
    color: #f9a826;
    margin: 10px 5px;
    border-bottom: 2px solid #f9a826;
}

#sidenavToggleArrow {
    position: fixed;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    cursor: pointer;
    transition: margin-left .1s;
}

.sb-checkbox-round {
    display: flex;
    align-items: center;
    margin-right: 10px;
}

.sb-checkbox-round a {
    flex: 1;
    margin-right: 8px;
}

.sb-checkbox-round input[type="checkbox"] {
    display: none;
}

.sb-task-check {
    position: relative;
    width: 25px;
    height: 25px;
    border-radius: 50%;
    background-color: #2b2b2b;
    box-shadow: inset 0 0 0 2px #f9a826;
    flex-shrink: 0;
    transition: background-color 0.3s;
    overflow: hidden;
}

.sb-checkbox-round input[type="checkbox"]:checked + .sb-task-check {
    background-color: #f9a826;
}

.sb-checkbox-round input[type="checkbox"]:checked + .sb-task-check::before {
    content: '';
    position: absolute;
    --t: 5px;
    --r: 3px;
    --w: 22px;
    --h: 13px;
    --c: #1f1f1f;
    width: var(--w);
    height: var(--h);
    border-bottom-left-radius: var(--r);
    background:
            radial-gradient(farthest-side at top right, transparent 97%, var(--c) 100%) bottom calc(var(--t) - 1.2px) left calc(var(--t) - 1.2px) / calc(var(--t) * 0.8) calc(var(--t) * 0.8),
            radial-gradient(farthest-side, var(--c) 99%, transparent 100%) top left / var(--t) var(--t),
            radial-gradient(farthest-side, var(--c) 99%, transparent 100%) bottom right / var(--t) var(--t),
            linear-gradient(var(--c), var(--c)) left bottom / var(--t) calc(100% - var(--t) / 2),
            linear-gradient(var(--c), var(--c)) left bottom / calc(100% - var(--t) / 2) var(--t);
    background-repeat: no-repeat;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.44) rotate(-45deg);
}

#dropdown-menu-link i {
    padding: 0.65rem 0.75rem;
}

#navbar #dropdown-menu-link::after {
    border-color: #4a4a4a;
}

#navbar #dropdown-menu-link:focus {
    color: #4a4a4a;
}

/* FOOTER STYLE START */
.site-footer {
    background: color-mix(in srgb, var(--text-section-bg) 55%, #ffffff);
    background:
        radial-gradient(900px 320px at 90% 0%, rgba(255, 255, 255, 0.55) 0%, rgba(255, 255, 255, 0) 72%),
        linear-gradient(
            180deg,
            color-mix(in srgb, var(--text-section-bg) 58%, #ffffff) 0%,
            color-mix(in srgb, var(--text-section-bg) 70%, #ffffff) 100%
        );
    border-top: 2px solid rgba(0, 0, 0, 0.85);
    padding-top: 2.25rem;
    padding-bottom: 2.75rem;
}

.site-footer-inner {
    padding: 0;
}

.site-footer-columns {
    margin: 0;
}

.site-footer .social-links {
    display: flex;
    justify-content: center;
    gap: 0.85rem;
}

.site-footer .a-contact {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 46px;
    height: 46px;
    border-radius: 999px;
    border: 2px solid rgba(0, 0, 0, 0.85);
    background: rgba(255, 255, 255, 0.75);
    color: #1f1300;
    box-shadow: 5px 5px 0 rgba(0, 0, 0, 0.22);
    transition: transform 0.18s ease-out, box-shadow 0.18s ease-out, background-color 0.18s ease-out;
}

.site-footer .a-contact:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 7px 7px 0 rgba(0, 0, 0, 0.22);
}

.site-footer .a-contact:active {
    transform: translateY(0);
    box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.22);
}

.site-footer .a-contact:focus-visible {
    outline: 3px solid rgba(0, 0, 0, 0.65);
    outline-offset: 3px;
}

.site-footer .feedback-button {
    border: 2px solid rgba(0, 0, 0, 0.85);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.8);
    color: #1f1300;
    font-weight: 800;
    box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.22);
    padding: 0.85rem 1.15rem;
    transition: transform 0.18s ease-out, box-shadow 0.18s ease-out, background-color 0.18s ease-out;
}

.site-footer .feedback-button:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.22);
}

.site-footer .feedback-button:active {
    transform: translateY(0);
    box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.22);
}

.site-footer .feedback-button:focus-visible {
    outline: 3px solid rgba(0, 0, 0, 0.65);
    outline-offset: 3px;
}

.site-footer .footer-text {
    font-size: 0.95rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    color: rgba(31, 19, 0, 0.7);
}

@media screen and (max-width: 768px) {
    .site-footer-inner {
        padding: 1.05rem 0.95rem;
    }

    .site-footer .feedback-button {
        width: 100%;
        justify-content: center;
    }
}

@media screen and (max-width: 1023px) {
    /* On mobile the dropdown is an accordion inside the burger menu. Keep it in-flow:
       no popover shadow/positioning that could overlap other items. */
    #navbar .navbar-item.has-dropdown .navbar-dropdown {
        display: none;
        position: static;
        box-shadow: none;
        margin-top: 0.35rem;
    }

    #navbar .navbar-item.has-dropdown.is-active .navbar-dropdown {
        display: block;
    }

    #navbar .navbar-end .buttons .button {
        width: 100%;
        justify-content: center;
    }
}

@media (prefers-reduced-motion: reduce) {
    .site-footer .a-contact,
    .site-footer .feedback-button {
        transition: none;
    }

    .site-footer .a-contact:hover,
    .site-footer .feedback-button:hover {
        transform: none;
        box-shadow: inherit;
    }
}