/* Page shell: container, header, navigation, language menu, footer. */

.container {
    width: 100%;
    max-width: calc(var(--content-max) + var(--gutter) * 2);
    margin-inline: auto;
    padding-inline: var(--gutter);
}

@media (min-width: 1100px) {
    :root { --gutter: 48px; }
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(13, 14, 16, 0.92);
    border-bottom: 1px solid var(--line);
}
@supports (backdrop-filter: blur(1px)) {
    /* The one translucent surface: content scrolling under the bar stays legible. */
    .site-header { background: rgba(13, 14, 16, 0.78); backdrop-filter: blur(12px); }
}

.site-header__bar {
    display: flex;
    align-items: center;
    gap: 32px;
    height: var(--header-h);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 44px;
    color: var(--text);
    text-decoration: none;
    font-weight: 800;
    font-size: 18px;
    letter-spacing: -0.02em;
    flex-shrink: 0;
}
.brand:hover { text-decoration: none; }
.brand__mark { width: 28px; height: 28px; border-radius: 7px; object-fit: contain; }

.site-nav { flex: 1; }
.site-nav__list { display: flex; gap: 2px; }
.site-nav__link {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    padding: 0 12px;
    color: var(--muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    border-radius: var(--radius-sm);
    transition: color 150ms var(--ease), background-color 150ms var(--ease);
}
.site-nav__link:hover { color: var(--text); background: var(--panel); }
.site-nav__link[aria-current="page"] { color: var(--text); }

.site-header__tools { display: flex; align-items: center; gap: 8px; margin-left: auto; }

.show-sm { display: none; }

.nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: var(--control);
    color: var(--text);
    border: 1px solid var(--line-2);
    border-radius: var(--radius-sm);
}
.nav-toggle__bars,
.nav-toggle__bars::before,
.nav-toggle__bars::after {
    display: block;
    width: 16px;
    height: 2px;
    background: currentColor;
    border-radius: 1px;
    transition: transform 150ms var(--ease);
}
.nav-toggle__bars { position: relative; }
.nav-toggle__bars::before,
.nav-toggle__bars::after { content: ""; position: absolute; left: 0; }
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

/* Language menu */
.lang { position: relative; }
.lang__button {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 44px;
    padding: 0 10px;
    color: var(--muted);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    list-style: none;
    transition: color 150ms var(--ease), background-color 150ms var(--ease);
}
.lang__button::-webkit-details-marker { display: none; }
.lang__button:hover,
.lang[open] .lang__button { color: var(--text); background: var(--panel); }
.lang__icon { flex-shrink: 0; }
.lang__code { font-family: var(--font-mono); font-size: 13px; }

.lang__menu {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    z-index: 60;
    min-width: 200px;
    padding: 6px;
    background: var(--panel);
    border: 1px solid var(--line-2);
    border-radius: var(--radius);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
}
.lang__option {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    min-height: 44px;
    padding: 0 12px;
    color: var(--text);
    text-decoration: none;
    font-size: 15px;
    border-radius: var(--radius-sm);
}
.lang__option:hover { background: var(--panel-2); text-decoration: none; }
.lang__option[aria-current="true"] { color: var(--accent); }
.lang__tick { color: var(--accent); }

@media (max-width: 960px) {
    .js .nav-toggle { display: inline-flex; }
    .site-header__bar { gap: 12px; }

    .js .site-nav {
        display: none;
        position: absolute;
        left: 0; right: 0;
        top: var(--header-h);
        padding: 8px var(--gutter) 20px;
        background: var(--bg);
        border-bottom: 1px solid var(--line);
    }
    .js .site-nav.is-open { display: block; }
    .site-nav__list { flex-direction: column; gap: 0; }
    .site-nav__link {
        width: 100%;
        min-height: 52px;
        padding: 0 4px;
        font-size: 17px;
        border-radius: 0;
        border-bottom: 1px solid var(--line);
    }
    .site-nav__link:hover { background: transparent; }
    .site-nav__link[aria-current="page"] { color: var(--accent); }
}

@media (max-width: 560px) {
    .hide-sm { display: none; }
    .show-sm { display: inline; }
    .lang__code { display: none; }
}

/* Footer */
.site-footer {
    margin-top: 120px;
    background: var(--bg-2);
    border-top: 1px solid var(--line);
}
.site-footer__inner {
    display: grid;
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 2fr);
    gap: 40px 64px;
    padding-block: 56px 32px;
}
.site-footer__note { margin-top: 14px; color: var(--muted); font-size: 14px; max-width: 32ch; }

.site-footer__cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.site-footer__col { display: flex; flex-direction: column; align-items: flex-start; }
.site-footer__head { font-size: 13px; font-weight: 600; letter-spacing: 0; color: var(--faint); margin-bottom: 8px; }
.site-footer__col a {
    display: inline-flex;
    align-items: center;
    min-height: 36px;
    color: var(--muted);
    text-decoration: none;
    font-size: 14px;
}
.site-footer__col a:hover { color: var(--text); }
.site-footer__col a[aria-current="page"] { color: var(--text); }
.site-footer__meta { color: var(--faint); font-size: 13px; margin-top: 4px; }

.site-footer__legal {
    grid-column: 1 / -1;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 8px 24px;
    padding-top: 24px;
    border-top: 1px solid var(--line);
    color: var(--faint);
    font-size: 13px;
}
.site-footer__credit a { color: var(--muted); }
.site-footer__credit a:hover { color: var(--text); }

@media (max-width: 760px) {
    .site-footer { margin-top: 80px; }
    .site-footer__inner { grid-template-columns: 1fr; }
    .site-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .site-footer__col a { min-height: 44px; }
}