/* Blog + shop pages. Base tokens, fonts and the top bar live in nerdicate.css. */

.site .page { position: relative; z-index: 1; overflow-x: clip; }

.hero {
    position: relative;
    isolation: isolate;
    padding: clamp(130px, 22svh, 230px) var(--gutter) clamp(54px, 9svh, 110px);
    max-width: 1500px;
    margin: 0 auto;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0 calc(var(--gutter) * -1) 0;
    z-index: -1;
    background: var(--hero, none) center / cover no-repeat;
    opacity: .5;
    -webkit-mask-image: linear-gradient(to bottom, #000 35%, transparent 100%);
    mask-image: linear-gradient(to bottom, #000 35%, transparent 100%);
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0 calc(var(--gutter) * -1) 0;
    z-index: -1;
    background: linear-gradient(90deg, rgba(2, 4, 10, .85), rgba(2, 4, 10, .25) 70%);
}

.hero h1 { font-size: clamp(2.6rem, 7vw, 7rem); max-width: 13ch; }
.hero .lede { max-width: 44ch; }
.hero .eyebrow a:hover { color: var(--gold); }

.block {
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 var(--gutter) clamp(64px, 11svh, 120px);
}

.label {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 30px;
    font-family: var(--mono);
    font-size: 12px;
    font-weight: 400;
    letter-spacing: .34em;
    text-transform: uppercase;
    color: var(--mute);
}

.label::after { content: ""; flex: 1; height: 1px; background: rgba(143, 156, 186, .2); }

.meta {
    display: flex;
    flex-wrap: wrap;
    gap: 4px 0;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: .16em;
    text-transform: uppercase;
    color: var(--mute);
}

.meta a { color: var(--accent, var(--gold)); }
.meta a:hover { text-decoration: underline; text-underline-offset: 4px; }
.meta span::before { content: "·"; margin: 0 12px; opacity: .6; }

/* ---------- posts ---------- */

.feature {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: clamp(28px, 5vw, 72px);
    align-items: center;
    margin-bottom: clamp(48px, 8svh, 90px);
}

.feature-media, .card-media { display: block; overflow: hidden; background: #070b16; }
.feature-media { aspect-ratio: 16 / 10; }
.card-media { aspect-ratio: 16 / 10; }

.feature-media img, .card-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 1.2s var(--ease);
}

.feature:hover .feature-media img, .card:hover .card-media img { transform: scale(1.05); }

.feature-body { display: grid; gap: 20px; align-content: center; }
.feature h2 { font-size: clamp(2rem, 4.2vw, 4rem); max-width: 14ch; }
.feature h2 a:hover, .card h3 a:hover { color: var(--accent); }

.excerpt { color: #aab6d3; font-size: 1.02rem; line-height: 1.6; max-width: 52ch; }
.card .excerpt { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; font-size: .95rem; }

.more { font-family: var(--mono); font-size: 12px; letter-spacing: .24em; text-transform: uppercase; color: var(--accent); width: fit-content; }
.more:hover { text-decoration: underline; text-underline-offset: 6px; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(36px, 5svh, 56px) clamp(20px, 2.6vw, 36px); }
.card { display: grid; gap: 18px; align-content: start; }
.card-body { display: grid; gap: 12px; }
.card h3 { font-size: clamp(1.25rem, 1.8vw, 1.6rem); font-weight: 400; letter-spacing: -.02em; line-height: 1.2; }

.pager { display: flex; justify-content: center; gap: 14px; margin-top: 64px; }
.pager a {
    padding: 14px 26px;
    border: 1px solid rgba(143, 156, 186, .3);
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: .24em;
    text-transform: uppercase;
    transition: border-color .4s, color .4s;
}
.pager a:hover { border-color: var(--gold); color: var(--gold); }

.empty { color: var(--mute); font-size: 1.1rem; padding: 40px 0; }

/* ---------- single post ---------- */

.post { max-width: 840px; margin: 0 auto; padding: clamp(130px, 20svh, 200px) var(--gutter) clamp(60px, 10svh, 100px); }
.post-head { display: grid; gap: 24px; margin-bottom: 40px; }
.post h1 { font-size: clamp(2.3rem, 6vw, 4.8rem); }
.post .lede { margin: 0; max-width: none; }
.post-cover { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; margin-bottom: 48px; }

.notice {
    position: relative;
    z-index: 2;
    max-width: 840px;
    margin: 86px auto -110px;
    padding: 12px 18px;
    border: 1px solid rgba(245, 184, 92, .5);
    background: rgba(245, 184, 92, .08);
    color: var(--gold);
    font-family: var(--mono);
    font-size: 12px;
    letter-spacing: .08em;
}
.notice a { text-decoration: underline; text-underline-offset: 4px; margin-left: 8px; }

.prose { font-size: clamp(1.05rem, 1.4vw, 1.2rem); line-height: 1.85; color: #d3dbef; overflow-wrap: anywhere; }
.prose > * + * { margin-top: 1.4em; }
.prose h2, .prose h3, .prose h4 { color: var(--ink); font-weight: 500; letter-spacing: -.02em; line-height: 1.2; margin-top: 2.2em; }
.prose h2 { font-size: 1.9em; }
.prose h3 { font-size: 1.45em; }
.prose a { color: var(--accent, var(--gold)); text-decoration: underline; text-underline-offset: 4px; }
.prose strong { color: #fff; font-weight: 600; }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose ul { list-style: disc; }
.prose li + li { margin-top: .4em; }
.prose blockquote { padding-left: 1.4em; border-left: 2px solid var(--accent, var(--gold)); color: #fff; font-size: 1.12em; font-weight: 300; font-style: italic; }
.prose code { font-family: var(--mono); font-size: .86em; padding: .15em .4em; background: rgba(108, 184, 255, .1); border-radius: 3px; }
.prose pre { overflow-x: auto; padding: 1.2em 1.4em; background: rgba(8, 12, 24, .8); border: 1px solid rgba(143, 156, 186, .18); line-height: 1.6; }
.prose pre code { padding: 0; background: none; font-size: .88em; }
.prose img { max-width: 100%; height: auto; }
.prose hr { border: 0; height: 1px; background: rgba(143, 156, 186, .25); margin: 3em 0; }
.prose table { display: block; overflow-x: auto; border-collapse: collapse; font-size: .95em; }
.prose th, .prose td { padding: .6em 1em; border: 1px solid rgba(143, 156, 186, .2); text-align: left; }

.back { max-width: 1500px; margin: 0 auto; padding: 0 var(--gutter) 80px; font-family: var(--mono); font-size: 12px; letter-spacing: .24em; text-transform: uppercase; }
.back a:hover { color: var(--gold); }

/* ---------- shop ---------- */

.offers { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 340px), 460px)); gap: 28px; }

.offer {
    display: grid;
    border: 1px solid rgba(255, 255, 255, .09);
    background: rgba(6, 10, 22, .6);
    backdrop-filter: blur(6px);
}

.offer-media { aspect-ratio: 16 / 10; overflow: hidden; }
.offer-media img { width: 100%; height: 100%; object-fit: cover; }
.offer-body { display: grid; gap: 14px; align-content: start; padding: clamp(22px, 3vw, 34px); }
.offer h3 { font-size: clamp(1.4rem, 2.2vw, 1.9rem); font-weight: 400; letter-spacing: -.02em; line-height: 1.15; }
.offer p { color: #aab6d3; }
.offer .cta { margin-top: 12px; width: fit-content; }
.offer .cta svg { transition: transform .5s var(--ease); }
.offer .cta:hover svg { transform: translate(3px, -3px); }

/* ---------- footer ---------- */

.site-foot {
    position: relative;
    z-index: 1;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 16px 40px;
    padding: 34px var(--gutter) 40px;
    border-top: 1px solid rgba(143, 156, 186, .16);
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--mute);
}

.site-foot nav { display: flex; gap: 28px; }
.site-foot a:hover { color: var(--gold); }

/* ---------- responsive ---------- */

@media (max-width: 1000px) {
    .grid { grid-template-columns: repeat(2, 1fr); }
    .feature { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .grid { grid-template-columns: 1fr; }
    .meta span::before { margin: 0 8px; }
    .site-foot { padding-bottom: 90px; }
}

/* ---------- maths (KaTeX) ---------- */

.prose .math-block { display: block; margin: 1.6em 0; overflow-x: auto; overflow-y: hidden; text-align: center; }
.prose .katex { font-size: 1.1em; color: #fff; }

/* ---------- shop: book covers are portrait, show them whole ---------- */

.offer.is-book .offer-media {
    display: grid;
    place-items: center;
    aspect-ratio: 4 / 5;
    padding: 28px;
    background: radial-gradient(60% 55% at 50% 50%, rgba(47, 107, 255, .22), transparent 70%);
}

.offer.is-book .offer-media img { width: auto; height: 100%; max-width: 100%; object-fit: contain; box-shadow: 0 18px 50px rgba(0, 0, 0, .6), 0 0 40px rgba(108, 184, 255, .18); }

/* ---------- blog: compact header + topics sidebar ---------- */

.hero.compact { padding: clamp(96px, 14svh, 130px) var(--gutter) clamp(26px, 4svh, 44px); }
.hero.compact .eyebrow { margin-bottom: 14px; }
.hero.compact h1 { font-size: clamp(1.9rem, 4.2vw, 3.6rem); max-width: 22ch; }
.hero.compact .lede { margin-top: 14px; font-size: 1.05rem; max-width: 60ch; }
.hero.compact::before { opacity: .38; }

.blog-layout {
    display: grid;
    grid-template-columns: 250px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
    max-width: 1500px;
    margin: 0 auto;
    padding: 0 var(--gutter) clamp(64px, 11svh, 120px);
}

.topics { position: sticky; top: 96px; }

.topics-title { margin-bottom: 14px; font: 400 12px/1 var(--mono); letter-spacing: .34em; text-transform: uppercase; color: var(--mute); }

.topics ul { display: grid; gap: 2px; border-left: 1px solid rgba(143, 156, 186, .18); }

.topics a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 14px;
    margin-left: -1px;
    border-left: 2px solid transparent;
    color: #b9c4de;
    font-size: .98rem;
    transition: color .3s, border-color .3s, background .3s;
}

.topics a i { flex: none; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); }
.topics a span { flex: 1; }
.topics a small { font: 400 11px var(--mono); letter-spacing: .1em; color: var(--mute); }
.topics a:hover { color: #fff; background: rgba(255, 255, 255, .04); }
.topics a.is-active { color: #fff; border-left-color: var(--accent, var(--gold)); background: rgba(255, 255, 255, .05); }

.posts .feature { grid-template-columns: 1.15fr 1fr; margin-bottom: clamp(36px, 6svh, 60px); }
.posts .feature h2 { font-size: clamp(1.7rem, 3vw, 2.8rem); }
.posts .grid { grid-template-columns: repeat(2, 1fr); }

@media (max-width: 1000px) {
    .blog-layout { grid-template-columns: 1fr; gap: 28px; }
    .topics { position: static; margin: 0 calc(var(--gutter) * -1); padding: 0 var(--gutter); }
    .topics-title { display: none; }
    .topics ul { display: flex; gap: 8px; overflow-x: auto; border-left: 0; padding-bottom: 6px; scrollbar-width: none; }
    .topics ul::-webkit-scrollbar { display: none; }
    .topics li { flex: none; }
    .topics a { padding: 10px 16px; margin: 0; border: 1px solid rgba(143, 156, 186, .3); border-radius: 99px; white-space: nowrap; font-size: .9rem; }
    .topics a.is-active { border-color: var(--accent, var(--gold)); }
    .posts .feature { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .posts .grid { grid-template-columns: 1fr; }
}

/* ---------- way back to the blog ---------- */

.crumb {
    display: inline-block;
    margin-bottom: 28px;
    padding: 8px 0;
    border-bottom: 1px solid transparent;
    color: var(--accent, var(--gold));
    font: 400 12px/1 var(--mono);
    letter-spacing: .24em;
    text-transform: uppercase;
    transition: border-color .3s;
}

.crumb:hover { border-bottom-color: currentColor; }

@media (max-width: 720px) {
    .topnav { gap: 16px; }
}

/* the fixed bar stays readable over text while scrolling */
.site .bar { background: linear-gradient(to bottom, rgba(2, 4, 10, .92), rgba(2, 4, 10, .6) 65%, transparent); }

/* footer: legal links */
.site-foot nav { flex-wrap: wrap; justify-content: center; gap: 8px 28px; }
.foot .legal { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.foot .legal a { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- article: contents, reading progress, older / newer ---------- */

/* reading progress: bright, with a faint track so it reads even at 0% */
.read-progress { position: fixed; inset: 0 0 auto 0; z-index: 60; height: 3px; background: rgba(255, 255, 255, .1); pointer-events: none; }
.read-progress i { display: block; width: 0; height: 100%; background: linear-gradient(90deg, #ffc46b, #fff1cf); box-shadow: 0 0 10px rgba(255, 196, 107, .95), 0 0 2px #fff; }

.prose h2, .prose h3 { scroll-margin-top: 96px; }

/* contents (inline when JavaScript is off; see the media queries below) */
.toc { margin: 0 var(--gutter) 36px; padding: 20px 22px; border: 1px solid rgba(143, 156, 186, .2); border-left: 2px solid var(--accent, var(--gold)); background: rgba(6, 10, 22, .6); }
.toc-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
.toc-title { font: 400 11px/1 var(--mono); letter-spacing: .28em; text-transform: uppercase; color: var(--mute); }
.toc-close { display: none; width: 40px; height: 40px; border: 1px solid rgba(143, 156, 186, .3); border-radius: 50%; background: transparent; color: var(--ink); font-size: 15px; cursor: pointer; }
.toc ol { display: grid; gap: 1px; margin: 0; padding: 0; list-style: none; }
.toc a { display: block; padding: 8px 12px; border-left: 2px solid transparent; color: #b4c0dc; font-size: .96rem; line-height: 1.35; transition: color .25s, background .25s, border-color .25s; }
.toc a:hover { color: #fff; background: rgba(255, 255, 255, .04); }
.toc a.is-active { color: #fff; border-left-color: var(--accent, var(--gold)); background: rgba(255, 255, 255, .06); }
.toc .l3 a { padding-left: 28px; font-size: .88rem; color: #8f9cba; }
.toc .l3 a.is-active { color: #fff; }
.toc-meta { display: flex; justify-content: space-between; gap: 12px; margin-top: 16px; padding-top: 14px; border-top: 1px solid rgba(143, 156, 186, .16); font: 400 11px/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--mute); }
.toc-meta a { color: var(--gold); }

/* floating buttons */
.fab {
    position: fixed;
    right: 16px;
    bottom: 18px;
    z-index: 80;
    display: none;
    align-items: center;
    justify-content: center;
    gap: 10px;
    height: 48px;
    min-width: 48px;
    padding: 0 16px;
    border: 1px solid rgba(245, 184, 92, .55);
    border-radius: 99px;
    background: rgba(4, 8, 18, .9);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    color: var(--gold);
    font: 400 12px/1 var(--mono);
    letter-spacing: .18em;
    text-transform: uppercase;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .45);
    cursor: pointer;
}

.fab svg { width: 20px; height: 20px; flex: none; }
.fab:hover { background: rgba(245, 184, 92, .16); color: #fff; }
.toc-js .fab-top { display: flex; padding: 0; }
.toc-js .fab-top[hidden] { display: none; }

/* wide screens: contents in a sticky column beside the article, always one click away */
@media (min-width: 1100px) {
    .post-layout.has-toc {
        display: grid;
        grid-template-columns: 270px minmax(0, 840px);
        justify-content: center;
        gap: clamp(40px, 4vw, 72px);
        max-width: 1320px;
        margin: 0 auto;
        padding: 0 var(--gutter);
    }

    .post-layout.has-toc .post { max-width: none; margin: 0; padding-left: 0; padding-right: 0; }

    .post-layout.has-toc .toc {
        position: sticky;
        top: 96px;
        align-self: start;
        max-height: calc(100vh - 120px);
        margin: clamp(130px, 20svh, 200px) 0 0;
        padding: 6px 0 4px;
        overflow-y: auto;
        border: 0;
        background: none;
        scrollbar-width: thin;
        scrollbar-color: rgba(143, 156, 186, .3) transparent;
    }

    .post-layout.has-toc .toc ol { border-left: 1px solid rgba(143, 156, 186, .16); }
    .post-layout.has-toc .toc a { margin-left: -1px; }
}

/* phones and tablets: contents in a sheet opened from the floating button */
@media (max-width: 1099px) {
    .toc-js .fab-toc { display: flex; }
    .toc-js .fab-top { bottom: 76px; }

    .toc-js .post-layout.has-toc .toc {
        position: fixed;
        inset: auto 0 0 0;
        z-index: 90;
        max-height: 75vh;
        margin: 0;
        padding: 18px 18px calc(22px + env(safe-area-inset-bottom));
        overflow-y: auto;
        border: 0;
        border-top: 1px solid rgba(245, 184, 92, .45);
        border-radius: 18px 18px 0 0;
        background: rgba(4, 8, 18, .97);
        -webkit-backdrop-filter: blur(14px);
        backdrop-filter: blur(14px);
        transform: translateY(105%);
        visibility: hidden;
        transition: transform .35s var(--ease), visibility 0s .35s;
    }

    .toc-js .post-layout.has-toc .toc.is-open {
        transform: none;
        visibility: visible;
        box-shadow: 0 -24px 60px rgba(0, 0, 0, .7);
        transition: transform .35s var(--ease), visibility 0s;
    }

    .toc-js .toc-close { display: grid; place-items: center; }
    .toc-js .toc a { padding: 12px 12px; font-size: 1rem; }
    .toc-js .toc .l3 a { padding-left: 28px; font-size: .92rem; }
    .toc-open .fab { opacity: 0; pointer-events: none; }
}

.pn { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; max-width: 1500px; margin: 0 auto; padding: 0 var(--gutter) clamp(48px, 8svh, 90px); }
.pn a { display: grid; gap: 8px; padding: 22px 26px; border: 1px solid rgba(255, 255, 255, .09); background: rgba(6, 10, 22, .6); transition: border-color .4s, box-shadow .4s; }
.pn a:hover { border-color: var(--gold); box-shadow: 0 0 36px -14px var(--gold); }
.pn small { font: 400 11px/1 var(--mono); letter-spacing: .24em; text-transform: uppercase; color: var(--mute); }
.pn strong { font-size: clamp(1.05rem, 1.6vw, 1.35rem); font-weight: 400; letter-spacing: -.01em; line-height: 1.3; }
.pn-newer { grid-column: 2; text-align: right; }
.pn-older:only-child { grid-column: 1; }

@media (max-width: 640px) {
    .pn { grid-template-columns: 1fr; }
    .pn-newer { grid-column: 1; }
}

/* ---------- blog search + RSS ---------- */

.search { position: relative; margin-bottom: 26px; }
.search input { width: 100%; padding: 13px 46px 13px 16px; border: 1px solid rgba(143, 156, 186, .3); background: rgba(6, 10, 22, .6); color: var(--ink); font: inherit; font-size: .95rem; border-radius: 0; }
.search input::placeholder { color: var(--mute); }
.search input:focus { outline: 0; border-color: var(--gold); }
.search button { position: absolute; inset: 0 0 0 auto; width: 46px; display: grid; place-items: center; border: 0; background: transparent; color: var(--mute); cursor: pointer; transition: color .3s; }
.search button:hover { color: var(--gold); }
.search svg { width: 19px; height: 19px; }

.topics .rss-item { margin-top: 10px; }
.topics .rss { color: var(--mute); font: 400 11px/1 var(--mono); letter-spacing: .2em; text-transform: uppercase; }

@media (max-width: 1000px) {
    .search { margin: 0 var(--gutter) 14px; padding: 0; }
    .topics { padding-left: 0; padding-right: 0; margin: 0 calc(var(--gutter) * -1); }
    .topics ul { padding: 0 var(--gutter) 6px; }
    .topics .rss-item { margin-top: 0; }
}

/* ---------- long articles on phones: less scrolling, readable tables, solid top bar ---------- */

.prose th, .prose td { overflow-wrap: normal; word-break: normal; }

@media (max-width: 720px) {
    .site .bar { background: rgba(2, 4, 10, .94); -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); padding-bottom: 16px; }
    .prose { font-size: 1.02rem; line-height: 1.7; }
    .prose > * + * { margin-top: 1.05em; }
    .prose h2, .prose h3, .prose h4 { margin-top: 1.7em; }
    .prose .math-block { margin: 1em 0; }
    .prose table { font-size: .88em; }
    .prose th, .prose td { min-width: 7.5em; padding: .5em .7em; }
}