/* ============================================================
   LAYOUT SHELL
   ============================================================ */

.page {
    max-width: var(--measure);
    padding: calc(var(--unit) * 3) calc(var(--unit) * 1.5) calc(var(--unit) * 6);
}

@media (max-width: 600px) {
    .page {
        padding: calc(var(--unit) * 2) var(--unit) calc(var(--unit) * 4);
    }
}

/* ── Site header ── */

.site-header {
    margin-bottom: calc(var(--unit) * 3);
    padding-bottom: var(--unit);
    border-bottom: 1px solid var(--color-rule);
}

.site-header .wordmark {
    font-family: var(--font-mono);
    font-size: var(--text-small);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-ink);
    text-decoration: none;
    line-height: var(--unit);
    display: inline-block;
}

.site-header nav {
    display: flex;
    gap: calc(var(--unit) * 1);
    margin-top: 0;
}

.site-header nav a {
    font-family: var(--font-mono);
    font-size: var(--text-meta);
    color: var(--color-muted);
    text-decoration: none;
    line-height: var(--unit);
}
.site-header nav a:hover {
    color: var(--color-accent);
}

/* ── Post meta (byline / date) ── */

.post-meta {
    font-family: var(--font-mono);
    font-size: var(--text-meta);
    color: var(--color-muted);
    line-height: var(--unit);
    margin-bottom: var(--unit);
    display: block;
}

/* ── Article footer ── */

.site-footer {
    margin-top: calc(var(--unit) * 3);
    padding-top: var(--unit);
    border-top: 1px solid var(--color-rule);
    font-family: var(--font-mono);
    font-size: var(--text-meta);
    color: var(--color-muted);
    line-height: var(--unit);
}

/* ============================================================
   BASELINE OVERLAY TOGGLE
   The signature element: flips on ruled lines spaced exactly
   --unit apart across the whole viewport, so every line of text
   visibly sits on a rule, like handwriting on notebook paper.
   ============================================================ */

.grid-toggle {
    position: fixed;
    bottom: var(--unit);
    right: var(--unit);
    z-index: 100;
    font-family: var(--font-mono);
    font-size: var(--text-meta);
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--color-muted);
    background: var(--color-paper);
    border: 1px solid var(--color-rule);
    border-radius: 3px;
    padding: 0.4em 0.7em;
    cursor: pointer;
    line-height: 1.4;
}

.grid-toggle:hover {
    color: var(--color-ink);
    border-color: var(--color-ink);
}

.grid-toggle[aria-pressed="true"] {
    color: var(--color-accent);
    border-color: var(--color-accent);
}

.grid-toggle .dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-rule);
    margin-right: 0.5em;
    position: relative;
    top: -1px;
}
.grid-toggle[aria-pressed="true"] .dot {
    background: var(--color-accent);
}

#baseline-overlay {
    position: absolute; /* scrolls WITH the document, not pinned to viewport */
    top: 0;
    left: 0;
    width: 100%;
    height: 100%; /* set in JS to match full document height */
    pointer-events: none;
    z-index: 99;
    background-image: repeating-linear-gradient(
        to bottom,
        var(--color-accent-faint) 0px,
        var(--color-accent-faint) 1px,
        transparent 1px,
        transparent var(--unit)
    );
    background-position: 0 0;
    display: none;
}

#baseline-overlay.visible {
    display: block;
}

/* respect reduced-motion / no surprises */
@media (prefers-reduced-motion: reduce) {
    .grid-toggle,
    #baseline-overlay {
        transition: none;
    }
}