/* ==========================================================================
   SHANTHA HI TECH — BLOG
   css/blog.css

   Shared by blog/index.html and every post under blog/.

   Modeled directly on css/legal.css: same reading-column layout (a sticky
   contents/related rail beside a constrained prose column), same token
   values, because a blog post and a legal document have the same shape —
   long-form text someone arrived to read, not a marketing page someone is
   scrolling through. Self-contained by the same convention every page
   stylesheet on this site follows: no shared base stylesheet exists, so
   the reset, tokens and .container are redeclared here rather than
   imported.

   Adds two tokens legal.css does not need (--t-2xl, --t-hero) for the
   index hero, taken from css/company.css so they match its scale exactly.

   No JS beyond the shared header — the contents rail is plain anchor
   links with CSS position: sticky, so it works with scripting off.
   ========================================================================== */

:root {
  --paper: #ffffff;
  --paper-2: #f8f7f5;
  --paper-3: #f1efeb;

  --charcoal: #1a1a1a;
  --ink: #2e2e2e;
  --muted: #6f6f6f;
  --line: #e3e1dc;

  --deep: #131313;
  --on-deep: #ffffff;
  --on-deep-muted: rgba(255, 255, 255, 0.62);
  --line-deep: rgba(255, 255, 255, 0.12);

  --font: "Clarkson", "Helvetica", Helvetica, Arial, sans-serif;

  --t-xs: 12px;
  --t-sm: 14px;
  --t-base: 16px;
  --t-lg: clamp(17px, 0.3vw + 16px, 19px);
  --t-xl: clamp(20px, 0.9vw + 17px, 26px);
  --t-2xl: clamp(24px, 1.6vw + 19px, 34px);
  --t-3xl: clamp(30px, 3.6vw + 16px, 56px);
  --t-hero: clamp(38px, 5vw + 18px, 76px);

  --s1: 8px;
  --s2: 16px;
  --s3: 24px;
  --s4: 32px;
  --s5: 48px;
  --s6: 64px;
  --s7: 96px;

  --gutter: 24px;
  /* Same reasoning as legal.css: this is a reading column plus a rail, not
     a full-bleed marketing layout, so it uses the narrower measure. */
  --container: 1040px;

  --r-btn: 4px;
  --r-card: 10px;
  --r-media: 14px;

  --ease: cubic-bezier(0.645, 0.045, 0.355, 1);
  --fast: 200ms;
}

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: var(--s4);
}

body {
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

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

.skip-link {
  position: absolute;
  top: -80px;
  left: 16px;
  z-index: 300;
  padding: 16px 24px;
  background: var(--charcoal);
  color: var(--paper);
  border-radius: var(--r-btn);
  font-size: var(--t-sm);
}

.skip-link:focus { top: 16px; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}


/* ==========================================================================
   HERO
   Shared by the index (eyebrow "Blog", h1 = "Blog") and every post
   (eyebrow = category, h1 = post title, meta = date/reading time).
   ========================================================================== */

.blog-hero {
  padding-top: var(--s6);
  padding-bottom: var(--s6);
  border-bottom: 1px solid var(--line);
  background-color: var(--paper-2);
}

.blog-hero__eyebrow {
  display: block;
  font-size: var(--t-xs);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--s3);
}

.blog-hero__title {
  max-width: 20ch;
  font-size: var(--t-3xl);
  font-weight: 300;
  letter-spacing: -0.035em;
  line-height: 1.06;
  color: var(--charcoal);
}

/* The index page's title runs larger — it is the section's front door,
   not a single article's headline. */
.blog-hero--index .blog-hero__title { font-size: var(--t-hero); }

.blog-hero__sub {
  max-width: 58ch;
  margin-top: var(--s3);
  font-size: var(--t-lg);
  line-height: 1.55;
  color: var(--muted);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s1) var(--s4);
  margin-top: var(--s4);
  font-size: var(--t-sm);
  color: var(--muted);
}

.post-meta b {
  font-weight: 500;
  color: var(--ink);
}


/* ==========================================================================
   POST LAYOUT
   Contents rail left, article body right — identical mechanics to
   .legal-body / .legal-toc, sticky on desktop, stacked on narrow screens.
   ========================================================================== */

.blog-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s6);
  padding-top: var(--s6);
  padding-bottom: var(--s7);
}

.post-toc__title {
  font-size: var(--t-xs);
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--s2);
}

.post-toc__list {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--line);
}

.post-toc__list a {
  display: block;
  padding: 7px 0 7px var(--s2);
  margin-left: -1px;
  border-left: 1px solid transparent;
  font-size: var(--t-sm);
  line-height: 1.4;
  color: var(--muted);
  transition: color var(--fast) var(--ease),
              border-color var(--fast) var(--ease);
}

.post-toc__list a:hover {
  color: var(--charcoal);
  border-left-color: var(--charcoal);
}

/* The reading column — same ~72ch measure as .legal-doc. */
.post-doc {
  max-width: 72ch;
}

.post-doc__section + .post-doc__section {
  margin-top: var(--s6);
  padding-top: var(--s6);
  border-top: 1px solid var(--line);
}

/* Editorial headings, not legal-clause headings — no numeral prefix. */
.post-doc__h {
  font-size: var(--t-xl);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--charcoal);
  margin-bottom: var(--s3);
}

.post-doc p {
  font-size: var(--t-base);
  line-height: 1.7;
  color: var(--ink);
}

.post-doc p + p { margin-top: var(--s2); }

.post-doc__list {
  margin-top: var(--s2);
  display: flex;
  flex-direction: column;
  gap: var(--s1);
}

.post-doc__list li {
  position: relative;
  padding-left: var(--s3);
  font-size: var(--t-base);
  line-height: 1.7;
  color: var(--ink);
}

.post-doc__list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.72em;
  width: 6px;
  height: 1px;
  background-color: var(--muted);
}

.post-doc__list b {
  font-weight: 500;
  color: var(--charcoal);
}

.post-doc a:not(.post-callout__link) {
  border-bottom: 1px solid var(--line);
  transition: border-color var(--fast) var(--ease);
}

.post-doc a:not(.post-callout__link):hover {
  border-bottom-color: var(--charcoal);
}

.post-doc img {
  width: 100%;
  border-radius: var(--r-media);
  margin-top: var(--s2);
}

.post-doc figcaption {
  margin-top: var(--s1);
  font-size: var(--t-sm);
  color: var(--muted);
}

/* Pulled-out key takeaway — same treatment as .legal-callout. */
.post-callout {
  margin-top: var(--s3);
  padding: var(--s3);
  background-color: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
}

.post-callout__t {
  font-size: var(--t-xs);
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--s1);
}

.post-callout p { font-size: var(--t-sm); line-height: 1.65; }


/* ==========================================================================
   BUTTONS
   ========================================================================== */

.co-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s1);
  min-height: 48px;
  padding-inline: var(--s3);
  border-radius: var(--r-btn);
  font-size: var(--t-sm);
  letter-spacing: 0.02em;
  transition: opacity var(--fast) var(--ease),
              background-color var(--fast) var(--ease),
              border-color var(--fast) var(--ease);
}

.co-btn--solid {
  background-color: var(--charcoal);
  color: var(--paper);
}

.co-btn--solid:hover { opacity: 0.84; }

.co-btn--outline {
  border: 1px solid var(--line);
  color: var(--charcoal);
}

.co-btn--outline:hover { border-color: var(--charcoal); }


/* ==========================================================================
   CLOSING CTA
   ========================================================================== */

.co-cta {
  text-align: center;
  padding-block: var(--s7);
  background-color: var(--paper-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.co-cta__t {
  max-width: 20ch;
  margin-inline: auto;
  font-size: var(--t-2xl);
  font-weight: 300;
  letter-spacing: -0.03em;
  line-height: 1.12;
  color: var(--charcoal);
}

.co-cta__b {
  max-width: 46ch;
  margin: var(--s3) auto 0;
  font-size: var(--t-base);
  line-height: 1.6;
  color: var(--muted);
}

.co-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s2);
  justify-content: center;
  margin-top: var(--s5);
}


/* ==========================================================================
   POST CARDS
   Used for the index listing and for "related posts" at the foot of a
   post. Same mechanics as .legal-more__grid / __card.
   ========================================================================== */

.post-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--s4);
}

.blog-index-list {
  padding-block: var(--s6) var(--s7);
}

.blog-hero__eyebrow--related { margin-bottom: var(--s4); }
.co-band--deep .blog-hero__eyebrow--related { color: var(--on-deep-muted); }

.post-card {
  display: block;
  padding: var(--s4);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
  transition: border-color var(--fast) var(--ease),
              background-color var(--fast) var(--ease);
}

.post-card:hover {
  border-color: var(--charcoal);
  background-color: var(--paper-2);
}

.post-card__meta {
  font-size: var(--t-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--s2);
}

.post-card__t {
  font-size: var(--t-lg);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--charcoal);
  margin-bottom: var(--s1);
}

.post-card__b {
  font-size: var(--t-sm);
  line-height: 1.6;
  color: var(--muted);
}

/* Dark variant — used where a related-posts grid sits on a deep band. */
.co-band--deep .post-card { border-color: var(--line-deep); }
.co-band--deep .post-card:hover {
  border-color: rgba(255, 255, 255, 0.4);
  background-color: rgba(255, 255, 255, 0.04);
}
.co-band--deep .post-card__t { color: var(--on-deep); }
.co-band--deep .post-card__b { color: var(--on-deep-muted); }


/* ==========================================================================
   FOOTER
   Matches the .foot convention shared by the rest of the site.
   ========================================================================== */

.foot {
  background-color: var(--deep);
  color: var(--on-deep);
  border-top: 1px solid var(--line-deep);
  padding: var(--s4) var(--gutter) var(--s2);
}

.foot__container {
  width: 100%;
  max-width: 1280px;
  margin-inline: auto;
}

.foot__grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--s3);
}

.foot__logo { height: 48px; width: auto; }

.foot__tag {
  margin-top: var(--s2);
  color: var(--on-deep-muted);
  font-size: var(--t-sm);
}

.foot__t {
  font-size: var(--t-xs);
  font-weight: 400;
  line-height: 1.06;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #898989;
  margin-bottom: 36px;
}

.foot__list { display: grid; gap: 0; }

.foot__list a {
  font-size: var(--t-sm);
  color: #898989;
  transition: color var(--fast) var(--ease);
  display: inline-flex;
  align-items: center;
  min-height: 32px;
}

.foot__list a:hover { color: var(--on-deep); }

.foot__base {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s3);
  align-items: center;
  margin-top: 36px;
  padding-top: var(--s1);
  border-top: 1px solid var(--line-deep);
  color: #898989;
  font-size: var(--t-sm);
}

.foot__base a {
  /* WCAG 2.2 SC 2.5.8 wants 24px; min-height (not padding) so font metrics
     can't leave it a pixel short — matches .foot__list a's treatment. */
  display: inline-flex;
  align-items: center;
  min-height: 32px;
}
.foot__base a:hover { color: var(--on-deep); }
.foot__base a[aria-current="page"] { color: var(--on-deep); }


/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

/* 992px, matching css/header.css's own hamburger-to-desktop cutover
   (max-width: 991px there) rather than the more usual 900/1024 — see
   css/company.css's identical note. */
@media (min-width: 992px) {
  .blog-body {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: var(--s7);
  }

  .post-toc {
    position: sticky;
    top: var(--s4);
    align-self: start;
    max-height: calc(100vh - var(--s6));
    overflow-y: auto;
  }
}

@media (min-width: 640px) {
  .post-grid { grid-template-columns: repeat(3, 1fr); }
}

/* The index listing reads better at 2-up than the 3-up related-posts
   strip — its cards carry more text (standfirst, not just a title). */
.post-grid--index { grid-template-columns: 1fr; }
@media (min-width: 640px) {
  .post-grid--index { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 1023px) {
  .foot__grid { grid-template-columns: 1fr 1fr; gap: var(--s4); }
}

@media (max-width: 600px) {
  .foot__grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}