/* =========================================================================
   TheSSS AI — layout
   Page frame shared by every page: container, sections, site header and
   site footer. Breakpoints: 640px (sm), 1024px (lg, desktop navigation).
   ========================================================================= */

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

.container--narrow {
    max-width: calc(var(--container-narrow) + 2 * var(--gutter));
}

/* --- Sections ------------------------------------------------------------- */
.section {
    position: relative;
    padding-block: var(--section-space);
}

.section--flush-top {
    padding-top: 0;
}

.section--subtle {
    background: var(--color-bg-subtle);
    border-block: 1px solid var(--color-border);
}

/* Dark band; also add .theme-ink so the content inside uses dark tokens */
.section--ink {
    background:
        radial-gradient(60% 80% at 85% 0%, rgba(214, 58, 196, 0.18), transparent 70%),
        radial-gradient(50% 70% at 0% 100%, rgba(99, 102, 241, 0.2), transparent 70%),
        #100d22;
    border-block: 1px solid var(--color-border);
    color: var(--color-text);
    isolation: isolate;
}

/* --- Site header ------------------------------------------------------------ */
.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    background: var(--color-header-bg);
    -webkit-backdrop-filter: saturate(160%) blur(14px);
    backdrop-filter: saturate(160%) blur(14px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--duration) ease, box-shadow var(--duration) ease;
}

.site-header.is-scrolled,
.site-header.is-open {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.site-header__inner {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    height: var(--header-h);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    flex-shrink: 0;
    color: var(--color-text);
    text-decoration: none;
}

.brand:hover {
    color: var(--color-text);
}

.brand__mark {
    width: 34px;
    height: 34px;
}

.brand__word {
    font-family: var(--font-display);
    font-size: 1.375rem;
    font-weight: var(--weight-black);
    letter-spacing: -0.03em;
    line-height: 1;
    background: linear-gradient(95deg, #f72c8f 0%, #c13be0 60%, #8e3bea 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.site-nav {
    display: flex;
    flex: 1;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-5);
}

.site-nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    margin-inline: auto;
}

.site-nav__links a {
    display: block;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 0.9375rem;
    font-weight: var(--weight-medium);
    text-decoration: none;
    transition: color var(--duration-fast) ease, background-color var(--duration-fast) ease;
}

/* aria-current="page" on the section's own page, "true" on pages below it */
.site-nav__links a:hover,
.site-nav__links a[aria-current] {
    color: var(--color-text);
    background: var(--color-accent-soft);
}

.site-nav__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.site-header .nav-toggle {
    display: none;
    margin-left: auto;
}

@media (max-width: 1023.98px) {
    .site-header .nav-toggle {
        display: inline-grid;
    }

    .site-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-4);
        padding: var(--space-4) var(--gutter) var(--space-5);
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-md);
        max-height: calc(100dvh - var(--header-h));
        overflow-y: auto;
    }

    .site-header:not(.is-open) .site-nav {
        display: none;
    }

    .site-nav__links {
        flex-direction: column;
        align-items: stretch;
        margin-inline: 0;
    }

    .site-nav__links a {
        padding: var(--space-3);
        font-size: var(--text-md);
    }

    .site-nav__actions {
        flex-wrap: wrap;
        padding-top: var(--space-4);
        border-top: 1px solid var(--color-border);
    }

    .site-nav__actions .btn {
        flex: 1;
    }
}

/* --- Site footer ------------------------------------------------------------ */
.site-footer {
    padding-block: var(--space-8) var(--space-6);
    background: var(--color-bg-subtle);
    border-top: 1px solid var(--color-border);
    font-size: var(--text-sm);
    color: var(--color-text-muted);
}

.site-footer__grid {
    display: grid;
    gap: var(--space-7) var(--space-6);
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.site-footer__about {
    grid-column: 1 / -1;
    max-width: 22rem;
}

.site-footer__about p {
    margin-block: var(--space-4) var(--space-5);
}

.site-footer h2 {
    margin-bottom: var(--space-4);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: var(--weight-medium);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-subtle);
}

.site-footer__links {
    display: grid;
    gap: var(--space-3);
}

.site-footer__links a {
    color: var(--color-text-muted);
    text-decoration: none;
}

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

.social-links {
    display: flex;
    gap: var(--space-2);
}

.site-footer__bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--space-3);
    margin-top: var(--space-8);
    padding-top: var(--space-5);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-subtle);
}

.site-footer__bottom a {
    color: inherit;
}

@media (min-width: 640px) {
    .site-footer__grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

@media (min-width: 1024px) {
    .site-footer__grid {
        grid-template-columns: 1.6fr repeat(4, minmax(0, 1fr));
    }

    .site-footer__about {
        grid-column: auto;
    }
}