/* =============================================================================
   Apolo — layout

   Três colunas em telas largas: navegação, conteúdo, sumário da página.
   O grid quebra em duas (sem sumário) e depois em uma (sidebar em drawer).
   ========================================================================== */

body {
    background-color: var(--surface-base);
    color: var(--text-base);
    font-family: var(--font-body);
    font-size: var(--fs-body);
    line-height: var(--lh-body);

    /* Malha de blueprint. Fixa, para não "andar" junto com o scroll. */
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: var(--grid-size) var(--grid-size);
    background-attachment: fixed;
}

/* ---- Topbar -------------------------------------------------------------- */

.topbar {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 40;
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 20px;
    background-color: var(--surface-raised);
    border-bottom: 1px solid var(--border-subtle);
}

.topbar__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.topbar__brand img {
    width: 28px;
    height: 28px;
}

.topbar__wordmark {
    font-family: var(--font-display);
    font-size: 18px;
    font-weight: 700;
    letter-spacing: .02em;
    color: var(--text-strong);
    line-height: 1;
}

.topbar__wordmark span {
    color: var(--accent);
}

.topbar__tagline {
    font-size: var(--fs-small);
    color: var(--text-faint);
    padding-left: 14px;
    margin-left: 4px;
    border-left: 1px solid var(--border-base);
    white-space: nowrap;
}

.topbar__spacer {
    flex: 1;
}

.topbar__actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

/* Botão hambúrguer — só aparece quando a sidebar virou drawer. */
.topbar__toggle {
    display: none;
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-base);
    border-radius: var(--radius-sm);
    color: var(--text-base);
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.topbar__toggle:hover {
    border-color: var(--accent-border);
    color: var(--accent);
}

/* ---- Shell --------------------------------------------------------------- */

.shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
    padding-top: var(--topbar-height);
}

/* ---- Sidebar ------------------------------------------------------------- */

.sidebar {
    position: fixed;
    top: var(--topbar-height);
    bottom: 0;
    left: 0;
    width: var(--sidebar-width);
    z-index: 30;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 22px 0 40px;
    background-color: var(--surface-raised);
    border-right: 1px solid var(--border-subtle);
}

.sidebar__group + .sidebar__group {
    margin-top: 22px;
}

.sidebar__group-title {
    padding: 0 22px 8px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .09em;
    text-transform: uppercase;
    color: var(--text-faint);
}

.sidebar__link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 7px 22px;
    font-size: 14.5px;
    color: var(--text-base);
    border-left: 2px solid transparent;
    transition: color var(--transition), background-color var(--transition);
}

.sidebar__link:hover {
    background-color: var(--surface-hover);
    color: var(--text-strong);
}

.sidebar__link.is-active {
    color: var(--accent);
    background-color: var(--accent-wash);
    border-left-color: var(--accent);
    font-weight: 500;
}

.sidebar__link-num {
    font-family: var(--font-mono);
    font-size: 11.5px;
    color: var(--text-faint);
    min-width: 18px;
}

.sidebar__link.is-active .sidebar__link-num {
    color: var(--accent);
}

/* Fecha o drawer ao clicar fora, no mobile. */
.sidebar__scrim {
    display: none;
    position: fixed;
    inset: var(--topbar-height) 0 0 0;
    z-index: 25;
    background-color: rgba(0, 0, 0, .55);
}

/* ---- Área de conteúdo ---------------------------------------------------- */

.content {
    grid-column: 2;
    min-width: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr) var(--toc-width);
    gap: 48px;
    padding: 40px 40px 96px;
}

.doc {
    min-width: 0;
    max-width: var(--measure);
}

/* ---- Sumário da página (TOC) -------------------------------------------- */

.toc {
    position: sticky;
    top: calc(var(--topbar-height) + 40px);
    align-self: start;
    max-height: calc(100vh - var(--topbar-height) - 80px);
    overflow-y: auto;
    font-size: var(--fs-small);
    line-height: 1.5;
}

.toc__title {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .09em;
    text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: 10px;
}

.toc__link {
    display: block;
    padding: 4px 0 4px 12px;
    color: var(--text-muted);
    border-left: 1px solid var(--border-base);
    transition: color var(--transition), border-color var(--transition);
}

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

.toc__link.is-active {
    color: var(--accent);
    border-left-color: var(--accent);
}

.toc:empty {
    display: none;
}

/* ---- Rodapé de navegação ------------------------------------------------- */

.doc-nav {
    display: flex;
    gap: 12px;
    margin-top: 56px;
    padding-top: 24px;
    border-top: 1px solid var(--border-subtle);
}

.doc-nav__link {
    flex: 1;
    padding: 14px 16px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius);
    background-color: var(--surface-card);
    transition: border-color var(--transition);
}

.doc-nav__link:hover {
    border-color: var(--accent-border);
}

.doc-nav__link--next {
    text-align: right;
}

.doc-nav__dir {
    display: block;
    font-size: 11px;
    letter-spacing: .07em;
    text-transform: uppercase;
    color: var(--text-faint);
    margin-bottom: 3px;
}

.doc-nav__title {
    font-size: 14.5px;
    color: var(--accent);
    font-weight: 500;
}

/* ---- Responsivo ---------------------------------------------------------- */

/* Some o sumário antes da sidebar: em 1200px a coluna de leitura já aperta. */
@media (max-width: 1279px) {
    .content {
        grid-template-columns: minmax(0, 1fr);
        gap: 0;
    }

    .toc {
        display: none;
    }
}

@media (max-width: 991px) {
    .shell {
        grid-template-columns: minmax(0, 1fr);
    }

    .content {
        grid-column: 1;
        padding: 28px 22px 80px;
    }

    .topbar__toggle {
        display: flex;
    }

    .topbar__tagline {
        display: none;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition);
        box-shadow: var(--shadow-float);
    }

    .sidebar.is-open {
        transform: translateX(0);
    }

    .sidebar.is-open ~ .sidebar__scrim,
    .sidebar__scrim.is-open {
        display: block;
    }
}

@media (max-width: 575px) {
    .content {
        padding: 22px 16px 72px;
    }

    .topbar {
        padding: 0 14px;
        gap: 10px;
    }

    .doc-nav {
        flex-direction: column;
    }

    .doc-nav__link--next {
        text-align: left;
    }
}