/* ==========================================================================
   QRİO — layout.css
   Шапка, мобильное меню, переключатель языка, подвал, страницы ошибок
   ========================================================================== */

/* ---------- Шапка ---------- */
.site-header {
    position: fixed;
    inset: 0 0 auto;
    z-index: 120;
    height: var(--header-h);
    transition:
        transform 0.5s var(--ease-out),
        background-color var(--t) ease,
        box-shadow var(--t) ease,
        height var(--t) var(--ease-out);
}

.site-header::before {
    content: "";
    position: absolute;
    inset: 0;
    z-index: -1;
    background: rgba(246, 244, 239, 0.78);
    -webkit-backdrop-filter: saturate(160%) blur(16px);
    backdrop-filter: saturate(160%) blur(16px);
    border-bottom: 1px solid rgba(16, 35, 27, 0.06);
    opacity: 0;
    transition: opacity var(--t) ease;
}

.site-header.is-scrolled::before {
    opacity: 1;
}

.site-header.is-hidden {
    transform: translateY(-100%);
}

.js .site-header__inner {
    animation: header-in 1s var(--ease-out) both 0.1s;
}

@keyframes header-in {
    from { opacity: 0; transform: translateY(-24px); }
    to { opacity: 1; transform: none; }
}

.site-header__inner {
    display: flex;
    align-items: center;
    gap: 32px;
    height: 100%;
}

.main-nav {
    margin-inline: auto;
}

.main-nav__list {
    display: flex;
    gap: 6px;
}

.main-nav__link {
    position: relative;
    display: block;
    padding: 10px 14px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--c-ink);
    border-radius: var(--r-pill);
    transition: color var(--t) ease, background-color var(--t) ease;
}

.main-nav__link::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 4px;
    width: 4px;
    height: 4px;
    margin-left: -2px;
    border-radius: 50%;
    background: var(--c-primary);
    transform: scale(0);
    transition: transform var(--t) var(--ease-spring);
}

.main-nav__link:hover,
.main-nav__link.is-active {
    background: rgba(16, 35, 27, 0.05);
}

.main-nav__link.is-active::after {
    transform: scale(1);
}

.site-header__actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* ---------- Переключатель языка ---------- */
.lang-switch {
    position: relative;
}

.lang-switch__btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 44px;
    padding-inline: 14px;
    border-radius: var(--r-pill);
    border: 1px solid var(--c-line-2);
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--c-ink);
    transition: border-color var(--t) ease, background-color var(--t) ease;
}

.lang-switch__btn:hover {
    background: var(--c-surface);
    border-color: var(--c-ink);
}

.lang-switch__btn .icon {
    width: 17px;
    height: 17px;
}

.lang-switch__chev {
    transition: transform var(--t) var(--ease-out);
}

.lang-switch.is-open .lang-switch__chev {
    transform: rotate(180deg);
}

.lang-switch__menu {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    min-width: 200px;
    padding: 8px;
    border-radius: var(--r);
    background: var(--c-surface);
    box-shadow: var(--sh-lg);
    border: 1px solid var(--c-line);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px) scale(0.98);
    transform-origin: top right;
    transition: all 0.3s var(--ease-out);
}

.lang-switch.is-open .lang-switch__menu {
    opacity: 1;
    visibility: visible;
    transform: none;
}

.lang-switch__item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--r-sm);
    font-size: 0.9375rem;
    color: var(--c-ink);
    transition: background-color var(--t-fast) ease;
}

.lang-switch__item:hover {
    background: var(--c-bg);
}

.lang-switch__item.is-active {
    background: var(--c-primary-soft);
    font-weight: 600;
}

.lang-switch__code {
    display: grid;
    place-items: center;
    width: 32px;
    height: 24px;
    border-radius: 6px;
    background: var(--c-bg-2);
    font-size: 0.6875rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

/* ---------- Бургер ---------- */
.burger {
    display: none;
    position: relative;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--c-primary);
    z-index: 120;
}

.burger__line {
    position: absolute;
    left: 14px;
    width: 18px;
    height: 2px;
    border-radius: 2px;
    background: #fff;
    transition: transform 0.45s var(--ease-out), opacity 0.3s ease, width 0.3s ease;
}

.burger__line:nth-child(1) { top: 16px; }
.burger__line:nth-child(2) { top: 22px; width: 12px; }
.burger__line:nth-child(3) { top: 28px; }

.burger[aria-expanded="true"] .burger__line:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.burger[aria-expanded="true"] .burger__line:nth-child(2) { opacity: 0; transform: translateX(-8px); }
.burger[aria-expanded="true"] .burger__line:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Мобильное меню ---------- */
.mobile-nav {
    position: fixed;
    inset: 0;
    z-index: 110;
    visibility: hidden;
    pointer-events: none;
}

.mobile-nav.is-open {
    visibility: visible;
    pointer-events: auto;
}

.mobile-nav__backdrop {
    position: absolute;
    inset: 0;
    background: rgba(16, 35, 27, 0.35);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    opacity: 0;
    transition: opacity 0.4s ease;
}

.mobile-nav.is-open .mobile-nav__backdrop {
    opacity: 1;
}

.mobile-nav__panel {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    padding: calc(var(--header-h) + 24px) var(--gutter) calc(24px + env(safe-area-inset-bottom));
    background: var(--c-bg);
    clip-path: circle(0 at calc(100% - 39px) 34px);
    transition: clip-path 0.7s var(--ease-in-out);
    overflow-y: auto;
}

.mobile-nav.is-open .mobile-nav__panel {
    clip-path: circle(150% at calc(100% - 39px) 34px);
}

.mobile-nav__list {
    display: grid;
    gap: 4px;
}

.mobile-nav__li {
    overflow: hidden;
    border-bottom: 1px solid var(--c-line);
}

.mobile-nav__link {
    display: flex;
    align-items: baseline;
    gap: 16px;
    padding: 16px 0;
    font-size: clamp(1.75rem, 8vw, 2.25rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--c-ink);
    transform: translateY(100%);
    transition: transform 0.7s var(--ease-out);
}

.mobile-nav__num {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--c-accent);
    letter-spacing: 0;
}

.mobile-nav.is-open .mobile-nav__link {
    transform: none;
}

.mobile-nav.is-open .mobile-nav__li:nth-child(1) .mobile-nav__link { transition-delay: 0.20s; }
.mobile-nav.is-open .mobile-nav__li:nth-child(2) .mobile-nav__link { transition-delay: 0.26s; }
.mobile-nav.is-open .mobile-nav__li:nth-child(3) .mobile-nav__link { transition-delay: 0.32s; }
.mobile-nav.is-open .mobile-nav__li:nth-child(4) .mobile-nav__link { transition-delay: 0.38s; }
.mobile-nav.is-open .mobile-nav__li:nth-child(5) .mobile-nav__link { transition-delay: 0.44s; }

.mobile-nav__langs,
.mobile-nav__actions {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.5s ease, transform 0.6s var(--ease-out);
}

.mobile-nav.is-open .mobile-nav__langs,
.mobile-nav.is-open .mobile-nav__actions {
    opacity: 1;
    transform: none;
    transition-delay: 0.5s;
}

.mobile-nav__langs {
    display: flex;
    gap: 8px;
    margin-top: 28px;
}

.mobile-nav__lang {
    flex: 1;
    display: grid;
    place-items: center;
    height: 46px;
    border-radius: var(--r-sm);
    border: 1px solid var(--c-line-2);
    font-weight: 700;
    font-size: 0.875rem;
    color: var(--c-ink);
}

.mobile-nav__lang.is-active {
    background: var(--c-primary);
    border-color: var(--c-primary);
    color: #fff;
}

.mobile-nav__actions {
    display: grid;
    gap: 10px;
    margin-top: auto;
    padding-top: 28px;
}

/* ---------- Подвал ---------- */
.site-footer {
    padding-top: 80px;
    background: var(--c-bg-2);
}

.site-footer__inner {
    display: grid;
    grid-template-columns: 1.6fr repeat(3, 1fr) auto;
    gap: 40px;
    padding-bottom: 56px;
}

.site-footer__tagline {
    margin-top: 12px;
    color: var(--c-muted);
    font-size: var(--fs-sm);
}

.site-footer__title {
    font-size: var(--fs-sm);
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 18px;
}

.site-footer__links {
    display: grid;
    gap: 10px;
}

.site-footer__links a {
    position: relative;
    font-size: var(--fs-sm);
    color: var(--c-muted);
    transition: color var(--t) ease;
}

.site-footer__links a:hover {
    color: var(--c-ink);
}

.site-footer__social {
    display: flex;
    gap: 10px;
    align-self: start;
}

.site-footer__bottom {
    font-size: var(--fs-sm);
    color: var(--c-muted);
}

.site-footer__bottom p {
    padding-block: 24px;
    border-top: 1px solid var(--c-line-2);
}

/* ---------- Страница ошибки ---------- */
.error-page {
    display: grid;
    min-height: 80vh;
    place-items: center;
    padding-top: var(--header-h);
    text-align: center;
}

.error-page__inner {
    display: grid;
    justify-items: center;
    gap: 18px;
}

.error-page__code {
    font-size: clamp(6rem, 20vw, 12rem);
    font-weight: 800;
    letter-spacing: -0.06em;
    line-height: 1;
    color: var(--c-primary);
}

/* ==========================================================================
   Адаптив
   ========================================================================== */
@media (max-width: 1180px) {
    .main-nav__link {
        padding-inline: 10px;
    }

    .site-header__login {
        display: none;
    }
}

@media (max-width: 1023px) {
    .main-nav,
    .site-header__cta {
        display: none;
    }

    .burger {
        display: block;
    }

    .site-header__actions {
        margin-left: auto;
    }

    .site-footer__inner {
        grid-template-columns: repeat(3, 1fr);
    }

    .site-footer__brand {
        grid-column: 1 / -1;
    }

    .site-footer__social {
        grid-column: 1 / -1;
    }
}

@media (max-width: 767px) {
    .site-header .lang-switch {
        display: none;
    }

    .site-footer {
        padding-top: 56px;
    }

    .site-footer__inner {
        grid-template-columns: 1fr 1fr;
        gap: 32px 20px;
    }
}