/* ---------- tokens ---------- */

:root {
    --bg: #f6f5f2;
    --fg: #0a0a0a;
    --muted: #737373;
    --rule: #0a0a0a1a;
    --link: #0b7a3b;
    --link-hover: #085c2c;

    --col: 28em;
    --date-col: 8em;
}

/* ---------- general page rules ---------- */

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

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: "Instrument Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
    font-size: 17px;
    font-weight: 400;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ---------- layout ---------- */

#holder {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    /* pack wrapped lines at the top: min-height would otherwise spread them
       down the full viewport, pushing the post list far below the tabs */
    align-content: flex-start;
    justify-content: space-between;
    gap: 1.5rem 3rem;

    min-height: 100vh;
    min-height: 100svh;
    padding: clamp(2rem, 6vh, 3.5rem) clamp(1.5rem, 4vw, 3rem);
}

/* ---------- tabs ---------- */

#tabs {
    display: flex;
    gap: 1.5rem;
    flex: 0 0 auto;
    /* centres the tabs on the name's vertical middle. A fixed offset rather
       than a flexbox alignment, because pages without a name (More) would
       otherwise have nothing to align to and the tabs would jump. */
    padding-top: 7px;
}

#tabs a {
    color: var(--muted);
    background-image: none;
    padding-bottom: 0;
}

/* no underline, so colour alone marks the current tab */
#tabs a:hover,
#tabs a.is-current {
    color: var(--fg);
}

/* ---------- text column ---------- */

#middle {
    flex: 1 1 var(--col);
    max-width: var(--col);
    margin-left: auto;
    text-align: right;
}

/* pages that read left-to-right (the post index) drop below the tabs
   and take the full width instead of hugging the right edge */
#middle.is-left {
    /* max-width must stay off the flex item itself: it would clamp the
       hypothetical main size and the item would never wrap below the tabs */
    flex-basis: 100%;
    max-width: none;
    margin-left: 0;
    margin-top: 0;
    text-align: left;
}

h1 {
    margin: 0 0 1.75rem;
    font-family: "Newsreader", Georgia, "Times New Roman", serif;
    font-size: 2.35rem;
    font-weight: 400;
    line-height: 1.1;
    letter-spacing: -0.015em;
}

p {
    margin: 0 0 1.35rem;
    text-wrap: pretty;
}

p:last-child {
    margin-bottom: 0;
}

/* ---------- post index ---------- */

.posts {
    margin: 0;
    padding: 0;
    max-width: 52em;
    list-style: none;
    border-top: 1px solid var(--rule);
}

/* fixed date column so every title starts at the same x */
.posts > li {
    display: grid;
    grid-template-columns: var(--date-col) minmax(0, 1fr);
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--rule);
}

.date {
    color: var(--fg);
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

/* this page uses the plain browser link effect, not the underline above:
   black at rest, green on hover */
.posts a {
    color: var(--fg);
    text-decoration: underline;
    background-image: none;
    padding-bottom: 0;
}

.posts a:hover {
    color: var(--link);
}

/* the small triangle sub-item under a post */
.sub {
    margin: 0.1rem 0 0;
    padding: 0;
    list-style: none;
}

.sub li {
    font-size: 0.85em;
    line-height: 1.55;
}

.sub li::before {
    content: "\25B8";
    margin-right: 0.35rem;
    color: var(--fg);
}

/* ---------- links ---------- */

a {
    color: var(--link);
    text-decoration: none;
    background-image: linear-gradient(currentColor, currentColor);
    background-repeat: no-repeat;
    background-position: 0 100%;
    background-size: 100% 1px;
    padding-bottom: 1px;
    transition: color 120ms ease, background-size 160ms ease;
}

a:hover {
    color: var(--link-hover);
    background-size: 100% 2px;
}

a:focus-visible {
    outline: 2px solid var(--link);
    outline-offset: 3px;
    border-radius: 2px;
}

@media (prefers-reduced-motion: reduce) {
    a {
        transition: none;
    }
}