/* ================================================================
   Layout — Base design system shared across all pages
   ================================================================ */

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

.doc-body {
    font-family: var(--toddyi-font-doc);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    min-height: var(--toddyi-size-100vh);
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    position: relative;
}

.doc-bg {
    position: fixed;
    inset: 0;
    z-index: -2;
    background-color: var(--bg);
    background-image:
        linear-gradient(
            180deg,
            color-mix(in srgb, var(--bg) 84%, transparent) 0%,
            color-mix(in srgb, var(--bg) 76%, transparent) var(--toddyi-size-100pct)
        ),
        url('../../docs-bg.webp');
    background-size: cover;
    background-position: center top;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

.doc-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.22;
    background-image:
        linear-gradient(var(--toddyi-grid-line) var(--toddyi-size-1px), transparent var(--toddyi-size-1px)),
        linear-gradient(90deg, var(--toddyi-grid-line) var(--toddyi-size-1px), transparent var(--toddyi-size-1px));
    background-size: var(--toddyi-size-48px) var(--toddyi-size-48px);
    mask-image: linear-gradient(180deg, black, transparent 85%);
}

/* --- Site Header --- */
.site-header {
    background: var(--toddyi-gradient-header);
    padding: 0;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
    box-shadow: 0 var(--toddyi-size-8px) var(--toddyi-size-32px) color-mix(in srgb, var(--toddyi-primary-dark) 25%, transparent);
}

.site-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 70% var(--toddyi-size-80pct) at var(--toddyi-size-80pct) 40%, color-mix(in srgb, var(--toddyi-secondary) 28%, transparent), transparent 55%),
        radial-gradient(circle at 15% 85%, color-mix(in srgb, var(--toddyi-accent-cyan) var(--toddyi-size-12pct), transparent), transparent 40%);
    pointer-events: none;
}

.site-header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--toddyi-size-1px);
    background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--toddyi-secondary) 60%, transparent), transparent);
}

.site-header__inner {
    position: relative;
    z-index: 1;
    max-width: var(--toddyi-size-980px);
    margin: 0 auto;
    padding: var(--toddyi-size-40px) var(--toddyi-size-28px) var(--toddyi-size-36px);
    text-align: center;
}

.site-header__brand {
    display: inline-flex;
    flex-direction: column;
    gap: var(--toddyi-size-6px);
    text-decoration: none;
    color: inherit;
}

.site-header__org {
    font-size: var(--toddyi-size-0-72rem);
    font-weight: 700;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    color: color-mix(in srgb, var(--text-on-dark) 70%, transparent);
}

.site-header__title {
    font-size: clamp(var(--toddyi-size-2rem), var(--toddyi-size-5vw), var(--toddyi-size-2-75rem));
    font-weight: 900;
    letter-spacing: var(--toddyi-size-0-08em);
    color: var(--text-on-dark);
    text-shadow: 0 var(--toddyi-size-2px) var(--toddyi-size-24px) var(--toddyi-app-shadow);
    line-height: 1.1;
}

.site-header__tagline {
    margin-top: var(--toddyi-size-12px);
    font-size: var(--toddyi-size-0-88rem);
    font-weight: 500;
    color: color-mix(in srgb, var(--text-on-dark) 82%, transparent);
    letter-spacing: 0.04em;
}

/* Legacy header (terms/privacy if any inline) */
header:not(.site-header) {
    background: var(--toddyi-gradient-header);
    padding: var(--toddyi-size-52px) var(--toddyi-size-24px) var(--toddyi-size-44px);
    text-align: center;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

header:not(.site-header) h1 {
    font-size: var(--toddyi-size-2-6rem);
    font-weight: 900;
    letter-spacing: 0.13em;
    text-transform: uppercase;
    color: var(--text-on-dark);
    position: relative;
    z-index: 1;
}

/* --- Language Nav --- */
.lang-nav {
    background: color-mix(in srgb, var(--surface) 92%, transparent);
    backdrop-filter: blur(var(--toddyi-size-12px));
    border-bottom: var(--toddyi-size-1px) solid var(--border);
    display: flex;
    justify-content: flex-end;
    padding: var(--toddyi-size-8px) var(--toddyi-size-16px);
    position: sticky;
    top: 0;
    z-index: 200;
    box-shadow: var(--shadow-sm);
    flex-shrink: 0;
}

/* One control that opens the list, rather than fifteen links across the bar.
   `position: relative` is what the panel below is positioned against. (#261) */
.lang-menu {
    position: relative;
}

.lang-menu__summary {
    display: inline-flex;
    align-items: center;
    gap: var(--toddyi-size-6px);
    cursor: pointer;
    list-style: none;
    color: var(--text-muted);
    font-size: var(--toddyi-size-0-78rem);
    font-weight: 600;
    letter-spacing: 0.04em;
    padding: var(--toddyi-size-6px) var(--toddyi-size-18px);
    border-radius: var(--toddyi-size-99px);
    border: var(--toddyi-size-1px) solid var(--border);
    transition: all var(--transition);
}

/* Safari draws its own disclosure triangle through `list-style: none`. */
.lang-menu__summary::-webkit-details-marker {
    display: none;
}

.lang-menu__summary:hover,
.lang-menu[open] > .lang-menu__summary {
    background: color-mix(in srgb, var(--primary) 10%, var(--surface));
    color: var(--primary);
    border-color: color-mix(in srgb, var(--primary) 25%, var(--border));
}

.lang-menu__chevron {
    display: inline-block;
    font-size: var(--toddyi-size-0-78rem);
    line-height: 1;
    transition: transform var(--transition);
}

.lang-menu[open] .lang-menu__chevron {
    transform: rotate(180deg);
}

.lang-menu__list {
    position: absolute;
    inset-inline-end: 0;
    top: calc(var(--toddyi-size-100pct) + var(--toddyi-size-8px));
    margin: 0;
    padding: var(--toddyi-size-6px);
    list-style: none;
    background: var(--surface);
    border: var(--toddyi-size-1px) solid var(--border);
    border-radius: var(--toddyi-size-12px);
    box-shadow: var(--shadow-sm);
    /* Fifteen entries are taller than a short viewport. */
    max-height: var(--toddyi-size-70vh);
    overflow-y: auto;
    min-width: var(--toddyi-size-200px);
    z-index: 210;
}

.lang-menu__link {
    display: block;
    padding: var(--toddyi-size-8px) var(--toddyi-size-14px);
    border-radius: var(--toddyi-size-8px);
    color: var(--text-muted);
    text-decoration: none;
    font-size: var(--toddyi-size-0-78rem);
    font-weight: 600;
    white-space: nowrap;
    transition: all var(--transition);
}

.lang-menu__link:hover {
    background: color-mix(in srgb, var(--primary) 10%, var(--surface));
    color: var(--primary);
}

.lang-menu__link.is-active {
    background: var(--toddyi-gradient-primary);
    color: var(--text-on-dark);
}

@media (prefers-reduced-motion: reduce) {
    .lang-menu__summary,
    .lang-menu__chevron,
    .lang-menu__link {
        transition: none;
    }
}

/* Icons from shared/brand/icons.json, the set the application draws. Sized in
   em so one rule serves the 40px feature cards and the 68px page badges, both
   of which already set a font-size. (#272) */
.icon {
    inline-size: var(--toddyi-size-1em);
    block-size: var(--toddyi-size-1em);
    stroke-width: 1.5;
    flex: none;
}

.icon--inline {
    inline-size: var(--toddyi-size-1rem);
    block-size: var(--toddyi-size-1rem);
    vertical-align: -0.15em;
    margin-inline-start: var(--toddyi-size-6px);
}

/* --- Main Content Box --- */
.box {
    max-width: var(--toddyi-size-900px);
    margin: 0 auto;
    width: var(--toddyi-size-100pct);
    padding: var(--toddyi-size-48px) var(--toddyi-size-28px) var(--toddyi-size-80px);
    flex: 1;
}

.box > main {
    background: var(--surface);
    border: var(--toddyi-size-1px) solid var(--border);
    border-radius: calc(var(--radius) + var(--toddyi-size-2px));
    box-shadow: var(--shadow-lg);
    padding: var(--toddyi-size-32px);
}

.box:has(.toddyi-page) > main {
    background: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
}