/* ==========================================================================
   blog.css: the blog list, tag pages and posts. Loaded after style.css,
   which already has the paper, cards, pins, top menu, dialog and post cards.
   ========================================================================== */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.blogpage { min-height: 100vh; min-height: 100svh; display: flex; flex-direction: column; }
.blogpage > main { flex: 1 0 auto; }            /* footer sits at the bottom even on short pages */
.blogpage > .footer { margin-top: auto; }

/* ---- List ------------------------------------------------------------------- */
.bloghead { width: min(100% - 2 * var(--page-gutter), 1120px); margin: 0 auto; padding: calc(var(--space-9) + 20px) 0 var(--space-7); display: grid; gap: var(--space-4); }
.bloghead__title { font-size: clamp(2.6rem, 7vw, 5.5rem); font-weight: 300; letter-spacing: var(--tracking-tight); line-height: 1; }
html[lang="th"] .bloghead__title { line-height: 1.15; letter-spacing: 0; }
.bloghead__intro { font-size: var(--text-lg); font-weight: 300; color: var(--color-muted); max-width: 46ch; }
.search { display: block; max-width: 420px; margin-top: var(--space-2); }
.search input { width: 100%; font: inherit; font-size: var(--text-sm); padding: 11px 18px; border: 0; border-radius: var(--radius-full); background: var(--color-card); box-shadow: 0 0 0 1.5px var(--color-text) inset; color: var(--color-text); }
.search input:focus { outline: 2px solid var(--marker); outline-offset: 2px; }
.bloghead .chips { padding: 0; }
.blogmain { width: min(100% - 2 * var(--page-gutter), 1120px); margin: 0 auto; padding-bottom: var(--space-9); }
.postlist__empty, .postlist__none { font-size: var(--text-lg); font-weight: 300; color: var(--color-muted); padding: var(--space-7) 0; }
.postcard.is-hidden { display: none; }

/* ---- Post ------------------------------------------------------------------- */
.post { width: min(100% - 2 * var(--page-gutter), 740px); margin: 0 auto; padding: calc(var(--space-9) + 10px) 0 var(--space-8); display: grid; gap: var(--space-6); }
.post__head { display: grid; gap: var(--space-3); }
.post__back { font-size: var(--text-sm); font-weight: 500; width: fit-content; }
.post__back:hover { color: var(--marker); }
.post__flag { width: fit-content; font-size: var(--text-xs); font-weight: 500; color: var(--marker); padding: 3px 10px; border-radius: var(--radius-full); box-shadow: 0 0 0 1.5px var(--marker) inset; }
.post__title { font-size: clamp(2.2rem, 5.4vw, 3.8rem); font-weight: 300; letter-spacing: var(--tracking-tight); line-height: 1.05; text-wrap: balance; }
html[lang="th"] .post__title { line-height: 1.25; letter-spacing: 0; }
.post__lead { font-size: 1.2rem; font-weight: 300; color: #555; }
.post__tags { display: flex; flex-wrap: wrap; gap: 6px; }
.post__tags a { font-size: var(--text-xs); font-weight: 500; padding: 4px 11px; border-radius: var(--radius-full); box-shadow: 0 0 0 1.5px var(--color-text) inset; }
.post__tags a:hover { background: var(--color-text); color: var(--color-bg); }
.post__cover { transform: rotate(-1deg); margin: 0 auto; width: 100%; }
.post__cover .card { padding: 14px 14px 18px; }
.post__cover img { width: 100%; height: auto; mix-blend-mode: multiply; }

.toc { background: var(--color-card); padding: 14px 20px; border-radius: 2px; box-shadow: 0 0 0 1px var(--color-rule) inset; }
.toc summary { font-size: var(--text-xs); font-weight: 500; letter-spacing: var(--tracking-wide); text-transform: uppercase; }
.toc ol { list-style: decimal; padding-left: 1.3em; margin-top: 8px; display: grid; gap: 4px; font-size: var(--text-sm); }
.toc a:hover { color: var(--marker); }

/* ---- Body text ---------------------------------------------------------------- */
.prose { font-size: 1.075rem; font-weight: 300; line-height: 1.75; overflow-wrap: anywhere; }
html[lang="th"] .prose { line-height: 1.9; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { font-size: 1.75rem; font-weight: 400; letter-spacing: -0.02em; line-height: 1.2; margin-top: 2em; scroll-margin-top: 80px; }
.prose h3 { font-size: 1.3rem; font-weight: 500; margin-top: 1.6em; scroll-margin-top: 80px; }
html[lang="th"] .prose h2, html[lang="th"] .prose h3 { line-height: 1.4; letter-spacing: 0; }
.prose strong { font-weight: 500; }
.prose a { text-decoration: underline; text-decoration-color: var(--marker); text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
.prose a:hover { color: var(--marker); }
.prose ul { list-style: disc; padding-left: 1.3em; }
.prose ol { list-style: decimal; padding-left: 1.4em; }
.prose li + li { margin-top: .3em; }
.prose blockquote { margin-left: 0; margin-right: 0; background: var(--color-card); padding: 18px 22px; border-radius: 2px; transform: rotate(-0.6deg); box-shadow: -4px 5px 12px rgba(0,0,0,.08); font-family: var(--font-hand); font-size: 1.7rem; line-height: 1.25; }
html[lang="th"] .prose blockquote { font-size: 1.35rem; line-height: 1.5; }
.prose hr { border: 0; height: 12px; background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 12'%3E%3Cpath d='M2 7 C40 2 70 11 100 6 S160 3 198 7' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round'/%3E%3C/svg%3E") center / 200px 12px no-repeat; }
.prose :not(pre) > code { font-size: .88em; background: #ebe6dc; padding: .12em .4em; border-radius: 4px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-weight: 400; }
.prose pre { background: var(--color-card); padding: 16px 18px; border-radius: 2px; overflow-x: auto; box-shadow: 0 0 0 1px var(--color-rule) inset; font-size: .88rem; line-height: 1.6; }
.prose pre code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.prose__fig { margin: 1.6em 0; }
.prose__fig img { width: 100%; height: auto; border-radius: 2px; background: var(--color-ph); }
.prose__fig figcaption { font-family: var(--font-hand); font-size: 1.5rem; line-height: 1.2; text-align: center; margin-top: 6px; }
html[lang="th"] .prose__fig figcaption { font-size: 1.2rem; }
.prose__table { overflow-x: auto; }
.prose table { border-collapse: collapse; width: 100%; font-size: .95rem; }
.prose th, .prose td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--color-rule); vertical-align: top; }
.prose th { font-weight: 500; border-bottom: 1.5px solid var(--color-text); }
.prose .footnote { font-size: var(--text-sm); color: var(--color-muted); }
.zoomable-img { cursor: zoom-in; }

/* Code colours (Pygments tokens), quiet on paper */
.code .c, .code .c1, .code .cm { color: #6f6f6f; font-style: italic; }
.code .k, .code .kn, .code .kd, .code .kc, .code .ow { color: #1f45d6; }
.code .s, .code .s1, .code .s2, .code .sa, .code .sd, .code .si { color: #1f7a4d; }
.code .mi, .code .mf, .code .m { color: #b5541a; }
.code .nf, .code .nc { color: #000; font-weight: 500; }
.code .nb, .code .bp { color: #7a3fb0; }

/* ---- Share + newer/older ---------------------------------------------------- */
.share { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding-top: var(--space-5); border-top: 1px solid var(--color-rule); }
.share .eyebrow { margin-right: 4px; }
.share__btn { font-size: var(--text-xs); font-weight: 500; padding: 7px 14px; border-radius: var(--radius-full); box-shadow: 0 0 0 1.5px var(--color-text) inset; background: none; }
.share__btn:hover { background: var(--color-text); color: var(--color-bg); }
.post__nav { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-4); }
.post__nav a { display: grid; gap: 4px; padding: 14px 16px; background: var(--color-card); border-radius: 2px; font-size: var(--text-sm); box-shadow: 0 0 0 1px var(--color-rule) inset; }
.post__nav a:hover { box-shadow: 0 0 0 1.5px var(--color-text) inset; }
.post__older { text-align: right; }
@media (max-width: 560px) { .post__nav { grid-template-columns: 1fr; } .post__older { text-align: left; } }
@media print { .topbar, .share, .post__nav, .music, .totop, .toc { display: none !important; } }

/* ---- Case study pages (/work/<id>/) ------------------------------------------ */
.casetags { display: flex; flex-wrap: wrap; gap: 6px; }
.casetags span { font-size: var(--text-xs); font-weight: 500; padding: 4px 11px; border-radius: var(--radius-full); box-shadow: 0 0 0 1px var(--color-rule) inset; background: var(--color-card); }
.casefacts { display: grid; gap: var(--space-5); margin: 0; padding: var(--space-6); background: var(--color-card); border-radius: 2px; box-shadow: 0 0 0 1px var(--color-rule) inset; }
.casefact dt { font-size: var(--text-xs); font-weight: 500; letter-spacing: var(--tracking-wide); text-transform: uppercase; color: var(--marker); }
.casefact dd { margin: 6px 0 0; font-size: 1.05rem; font-weight: 300; line-height: 1.75; }
html[lang="th"] .casefact dd { line-height: 1.9; }
.casefact .case__stack { display: flex; flex-wrap: wrap; gap: 6px; }
.casefact .case__stack i { font-style: normal; font-size: var(--text-xs); font-weight: 500; padding: 3px 10px; border-radius: var(--radius-full); background: var(--color-bg); }
.casesec { font-size: 1.6rem; font-weight: 400; letter-spacing: -0.02em; margin-top: var(--space-4); }
.casegallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: var(--space-4); }
.casegallery .prose__fig { margin: 0; }
.casegallery img { width: 100%; height: auto; border-radius: 2px; }
.casecta { transform: rotate(-0.8deg); }
.casecta .card { padding: 26px 28px; display: grid; gap: 8px; }
.casecta h2 { font-size: 1.6rem; font-weight: 300; letter-spacing: -0.02em; }
.casecta p { font-weight: 300; }
.casecta__btns { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; }

/* Reading progress (top of a post) and related posts */
.readbar { position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 60; pointer-events: none; }
.readbar span { display: block; height: 100%; width: 100%; background: var(--marker); transform-origin: 0 50%; transform: scaleX(0); }
.related { display: grid; gap: var(--space-4); }
.postlist--related { grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr)); gap: var(--space-5); }
.postlist--related .postcard__excerpt, .postlist--related .postcard__cover { display: none; }
@media print { .readbar, .related { display: none !important; } }

/* ---- System sketch on case pages (tools/diagram.py) ------------------------------
   Two drawings of the same diagram: across for wide screens, on its side for phones.
   Strokes draw themselves once when the sketch scrolls in (js/blog.js adds .is-drawn). */
.casefacts, .casefact, .casefact dd { min-width: 0; }
.diagram { min-width: 0; max-width: 100%; margin: var(--space-5) 0 0; padding: var(--space-4) 0 0; border-top: 1px dashed var(--color-rule); }
.diagram__head { font-family: var(--font-hand); font-size: 1.7rem; line-height: 1; color: var(--marker); margin: 0 0 var(--space-3); }
.diagram__scroll { overflow-x: auto; overscroll-behavior-x: contain; -webkit-overflow-scrolling: touch; }
.diagram figcaption { margin-top: var(--space-2); font-size: var(--text-xs); color: var(--color-muted); }
.dg { display: block; width: 100%; max-width: var(--w); height: auto; margin: 0 auto; overflow: visible; }
.dg--across { min-width: min(var(--w), 640px); }
.dg--down { display: none; }
@media (max-width: 640px) {
  .dg--across { display: none; }
  .dg--down { display: block; min-width: calc(var(--w) * 0.75); }
  .casefacts { padding: var(--space-4); }
}
.dg-fill { fill: var(--color-card); }
.dg-ink, .dg-ink2, .dg-edge, .dg-head, .dg-group { fill: none; stroke-linecap: round; stroke-linejoin: round; }
.dg-ink { stroke: var(--color-text); stroke-width: 1.5; }
.dg-ink2 { stroke: var(--color-text); stroke-width: 0.7; opacity: 0.35; }
.dg-edge, .dg-head { stroke: var(--marker); stroke-width: 1.6; }
.dg-group { stroke: var(--color-muted); stroke-width: 1.1; stroke-dasharray: 5 6; }
.dg-glabel, .dg-elabel { font-family: var(--font-hand); fill: var(--color-muted); paint-order: stroke; stroke: var(--color-card); stroke-width: 5px; stroke-linejoin: round; }
.dg-glabel { font-size: 21px; }
.dg-elabel { font-size: 18px; fill: var(--marker); }
html[lang="th"] .dg-glabel, html[lang="th"] .dg-elabel { font-size: 12.5px; }
.dg-core .dg-fill { fill: #eef1fd; }
.dg-core .dg-ink { stroke: var(--marker); stroke-width: 1.9; }
.dg-core .dg-ink2 { stroke: var(--marker); }
.dg-ext .dg-ink, .dg-option .dg-ink { stroke-dasharray: 6 5; }
.dg-option .dg-ink { stroke: var(--marker); }
.dg-ext .dg-ink2, .dg-option .dg-ink2 { display: none; }
.dg-person .dg-fill { fill: #fbf8f1; }
.dg-text { box-sizing: border-box; height: 100%; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; text-align: center; font-family: var(--font-sans); color: var(--color-text); line-height: 1.2; }
.dg-text b { font-size: 14px; font-weight: 500; }
.dg-text span { font-size: 11.5px; font-weight: 400; color: var(--color-muted); }
html[lang="th"] .dg-text { line-height: 1.35; }
.dg-core .dg-text b { color: var(--marker); }

.diagram.will-draw .dg-draw { stroke-dasharray: 1; stroke-dashoffset: 1; }
.diagram.will-draw .dg-fade, .diagram.will-draw .dg-fill, .diagram.will-draw foreignObject, .diagram.will-draw .dg-glabel, .diagram.will-draw .dg-elabel { opacity: 0; }
.diagram.will-draw.is-drawn .dg-draw { stroke-dashoffset: 0; transition: stroke-dashoffset 0.8s cubic-bezier(.4, .1, .3, 1) calc(var(--i, 0) * 70ms); }
.diagram.will-draw.is-drawn .dg-fade, .diagram.will-draw.is-drawn .dg-fill { opacity: 1; transition: opacity 0.5s ease calc(var(--i, 0) * 70ms); }
.diagram.will-draw.is-drawn foreignObject, .diagram.will-draw.is-drawn .dg-glabel, .diagram.will-draw.is-drawn .dg-elabel { opacity: 1; transition: opacity 0.5s ease calc(var(--i, 0) * 70ms + 300ms); }
@media (prefers-reduced-motion: reduce) { .diagram.will-draw * { transition: none !important; } }
@media print { .diagram.will-draw * { opacity: 1 !important; stroke-dashoffset: 0 !important; } .dg--across { display: block !important; min-width: 0; } .dg--down { display: none !important; } }