/* The blog (rookahead.com/blog): the app's Graphite greys, tonal cards, Syne and DM Sans.
   Pages are built by scripts/build-blog.mjs; the theme follows your app setting, else the device's. */
@font-face {
  font-family: 'Syne';
  src: url('/blog/fonts/syne.woff2') format('woff2');
  font-weight: 400 800;
  font-display: swap;
}

@font-face {
  font-family: 'DM Sans';
  src: url('/blog/fonts/dm-sans.woff2') format('woff2');
  font-weight: 100 1000;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --bg: #09090a;
  --card: #1f1f24;
  --card-hover: #27272d;
  --card-edge: inset 0 0 0 1px rgba(255, 255, 255, 0.06);
  --line: rgba(255, 255, 255, 0.07);
  --text: #ededed;
  --text-2: #a1a1aa;
  --muted: #8a8a94;
  --brand: #38bdf8;
  --brand-ink: #04202e;
  --brand-card: #0f3446;
  --brand-card-text: #ededed;
  --btn: rgba(255, 255, 255, 0.085);
  --btn-hover: rgba(255, 255, 255, 0.14);
  --font-display: 'Syne', 'DM Sans', sans-serif;
  --font-ui: 'DM Sans', 'Helvetica Neue', Arial, sans-serif;
}

:root[data-theme='light'] {
  color-scheme: light;
  --bg: #f1f1f3;
  --card: #ffffff;
  --card-hover: #f7f7f8;
  --card-edge: inset 0 0 0 1px rgba(0, 0, 0, 0.05);
  --line: rgba(0, 0, 0, 0.08);
  --text: #17171a;
  --text-2: #4e4e56;
  --muted: #74747d;
  --brand: #0284c7;
  --brand-ink: #ffffff;
  --brand-card: #dbeffa;
  --brand-card-text: #082f45;
  --btn: rgba(0, 0, 0, 0.06);
  --btn-hover: rgba(0, 0, 0, 0.1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16.5px/1.7 var(--font-ui);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: 6px;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

/* ── Top bar ─────────────────────────────────────────────── */
.top {
  display: flex;
  align-items: center;
  gap: 28px;
  max-width: 1320px;
  margin: 0 auto;
  padding: 18px 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand svg {
  width: 34px;
  height: 34px;
  padding: 6px;
  border-radius: 10px;
  background: var(--text);
  fill: var(--bg);
}

.wordmark {
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 800;
  letter-spacing: -0.045em;
}

.wordmark span {
  font-weight: 500;
  color: var(--muted);
}

.top-nav {
  display: flex;
  gap: 22px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
}

.top-nav a {
  color: var(--text-2);
  text-decoration: none;
}

.top-nav a:hover,
.top-nav a[aria-current] {
  color: var(--text);
}

.top-end {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.icon-link {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 10px;
  color: var(--text-2);
}

.icon-link:hover {
  background: var(--btn);
  color: var(--text);
}

.icon-link svg {
  width: 19px;
  height: 19px;
  fill: currentColor;
}

.app-btn {
  display: inline-block;
  margin-left: 8px;
  padding: 9px 18px;
  border-radius: 999px;
  background: var(--brand);
  color: var(--brand-ink);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.app-btn:hover {
  filter: brightness(1.08);
}

/* ── Blog index ──────────────────────────────────────────── */
.index {
  max-width: 1320px;
  margin: 0 auto;
  padding: 24px 24px 80px;
}

.intro {
  display: flex;
  align-items: baseline;
  gap: 32px;
  margin-bottom: 28px;
}

.intro h1 {
  margin: 0;
  font-size: 56px;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.intro p {
  max-width: 46ch;
  margin: 0;
  color: var(--text-2);
}

/* The newest post: the page's one coloured card, its position breaking out of the corner. */
.hero {
  position: relative;
  display: block;
  min-height: 400px;
  overflow: hidden;
  border-radius: 28px;
  background: var(--brand-card);
  color: var(--brand-card-text);
  text-decoration: none;
}

.hero-text {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  max-width: 56%;
  padding: 56px 0 56px 56px;
}

.hero h2 {
  margin: 0;
  font-size: 44px;
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

.hero-desc {
  max-width: 48ch;
  font-size: 18px;
  opacity: 0.8;
}

.hero .meta {
  opacity: 0.7;
}

.hero-cta {
  margin-top: 10px;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--brand);
  color: var(--brand-ink);
  font-family: var(--font-display);
  font-weight: 700;
}

.hero-board {
  position: absolute;
  right: -40px;
  bottom: -90px;
  width: 470px;
  transform: rotate(-8deg);
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1);
}

.hero-board .board {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 14px;
  box-shadow: 0 30px 70px rgba(0, 0, 0, 0.45);
}

.hero:hover .hero-board {
  transform: rotate(-5deg) translateY(-10px);
}

.more-title {
  margin: 56px 0 18px;
  font-size: 24px;
}

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.card {
  display: flex;
  gap: 22px;
  height: 100%;
  padding: 18px;
  border-radius: 18px;
  background: var(--card);
  box-shadow: var(--card-edge);
  text-decoration: none;
}

.card:hover {
  background: var(--card-hover);
}

.card-board {
  flex: none;
  width: 116px;
}

.card-board .board {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.card-text {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.card h3 {
  margin: 2px 0 0;
  font-size: 20px;
}

.card-desc {
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.55;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  color: var(--muted);
  font-size: 14px;
}

/* ── A post ──────────────────────────────────────────────── */
.post-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 720px) 200px;
  justify-content: center;
  gap: 56px;
  max-width: 1320px;
  margin: 0 auto;
  padding: 24px 24px 80px;
}

.side,
.toc-rail {
  position: sticky;
  top: 24px;
  align-self: start;
  max-height: calc(100vh - 48px);
  overflow: auto;
}

.side-title,
.toc-title {
  display: block;
  margin: 0 0 10px;
  padding: 0 12px;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.side-title:hover {
  color: var(--text);
}

.side ul,
.drop ul,
.toc {
  margin: 0;
  padding: 0;
  list-style: none;
}

.side a,
.posts-menu a {
  display: block;
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.4;
  text-decoration: none;
}

.side a:hover,
.posts-menu a:hover {
  background: var(--btn);
  color: var(--text);
}

.side a[aria-current],
.posts-menu a[aria-current] {
  background: var(--card);
  box-shadow: var(--card-edge);
  color: var(--text);
  font-weight: 600;
}

.toc a {
  display: block;
  padding: 5px 12px;
  border-left: 2px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  line-height: 1.4;
  text-decoration: none;
}

.toc a:hover {
  color: var(--text);
}

.toc a[aria-current] {
  border-color: var(--brand);
  color: var(--text);
}

.post h1 {
  margin: 8px 0 14px;
  font-size: 44px;
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.06;
}

.lede {
  margin: 0 0 26px;
  color: var(--text-2);
  font-size: 19px;
  line-height: 1.55;
}

.byline {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
}

.avatar {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--text);
}

.avatar svg {
  width: 22px;
  height: 22px;
  fill: var(--bg);
}

.byline-text {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
}

.copy {
  margin-left: auto;
  padding: 8px 14px;
  border: 0;
  border-radius: 999px;
  background: var(--btn);
  color: var(--text);
  font: 600 14px var(--font-ui);
  cursor: pointer;
}

.copy:hover {
  background: var(--btn-hover);
}

/* Phones and narrow windows: the post list and the contents fold into menus. */
.drop {
  display: none;
  margin: 0 0 16px;
  border-radius: 14px;
  background: var(--card);
  box-shadow: var(--card-edge);
}

.drop summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  font-weight: 600;
  list-style: none;
  cursor: pointer;
}

.drop summary::-webkit-details-marker {
  display: none;
}

.drop summary::after {
  content: '';
  width: 8px;
  height: 8px;
  margin-right: 4px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg) translateY(-3px);
  transition: transform 0.2s ease;
}

.drop[open] summary::after {
  transform: rotate(225deg);
}

.drop ul {
  padding: 0 8px 10px;
}

.drop .toc a {
  border-left: 0;
}

.toc-inline {
  margin-top: 20px;
}

/* ── Prose ───────────────────────────────────────────────── */
.prose {
  padding-top: 8px;
}

.prose h2 {
  margin: 44px 0 10px;
  font-size: 27px;
  scroll-margin-top: 24px;
}

.prose h3 {
  margin: 30px 0 6px;
  font-size: 19px;
}

.prose p,
.prose li {
  color: var(--text-2);
}

.prose strong {
  color: var(--text);
}

.prose a {
  color: var(--text);
  text-decoration-color: var(--brand);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.prose a:hover {
  color: var(--brand);
}

.prose blockquote {
  margin: 20px 0;
  padding: 2px 18px;
  border-left: 3px solid var(--brand);
}

.prose code {
  font: 14.5px ui-monospace, 'SF Mono', Menlo, monospace;
}

.prose table {
  width: 100%;
  margin: 18px 0;
  border-collapse: collapse;
  font-size: 15px;
}

.prose th,
.prose td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--line);
  color: var(--text-2);
  text-align: left;
  vertical-align: top;
}

.prose th {
  color: var(--text);
  font-weight: 600;
}

.badge {
  margin-right: 2px;
  vertical-align: -3px;
}

.diagram {
  max-width: 460px;
  margin: 30px auto;
  padding: 14px;
  border-radius: 20px;
  background: var(--card);
  box-shadow: var(--card-edge);
}

.diagram .board {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 8px;
}

.diagram .coord {
  font: 600 20px var(--font-ui);
}

.diagram figcaption {
  margin: 12px 4px 2px;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.5;
}

.try {
  margin-top: 56px;
  padding: 30px 32px;
  border-radius: 24px;
  background: var(--brand-card);
  color: var(--brand-card-text);
}

.try h2 {
  margin: 0 0 8px;
  font-size: 26px;
}

.try p {
  margin: 0 0 18px;
  opacity: 0.85;
}

.try .try-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  margin: 0;
  opacity: 1;
}

.try .app-btn {
  margin: 0;
}

.pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.pager-link {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border-radius: 16px;
  background: var(--card);
  box-shadow: var(--card-edge);
  text-decoration: none;
}

.pager-link:hover {
  background: var(--card-hover);
}

.pager-link:only-child {
  grid-column: 1 / -1;
}

.pager-label {
  color: var(--muted);
  font-size: 14px;
}

.pager-title {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.3;
}

/* ── Footer ──────────────────────────────────────────────── */
.foot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  max-width: 1320px;
  margin: 0 auto;
  padding: 28px 24px 44px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.foot nav {
  display: flex;
  gap: 20px;
}

.foot a {
  color: var(--muted);
  text-decoration: none;
}

.foot a:hover {
  color: var(--text);
}

/* ── Smaller screens ─────────────────────────────────────── */
@media (max-width: 1200px) {
  .post-layout {
    grid-template-columns: 220px minmax(0, 720px);
  }

  .toc-rail {
    display: none;
  }

  .toc-inline {
    display: block;
  }
}

@media (max-width: 900px) {
  .post-layout {
    grid-template-columns: minmax(0, 720px);
    padding-top: 8px;
  }

  .side {
    display: none;
  }

  .posts-menu {
    display: block;
  }

  .top-nav {
    display: none;
  }

  .cards {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-text {
    max-width: none;
    padding: 36px 32px 300px;
  }

  .hero-board {
    right: 50%;
    bottom: -150px;
    width: 400px;
    margin-right: -200px;
  }

  .intro {
    flex-direction: column;
    gap: 8px;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 16px;
  }

  .top {
    gap: 12px;
    padding: 14px 16px;
  }

  .top-end .icon-link {
    display: none;
  }

  .index,
  .post-layout {
    padding-left: 16px;
    padding-right: 16px;
  }

  .intro h1 {
    font-size: 40px;
  }

  .hero {
    border-radius: 22px;
  }

  .hero-text {
    padding: 28px 22px 250px;
  }

  .hero h2 {
    font-size: 29px;
  }

  .hero-board {
    bottom: -140px;
    width: 330px;
    margin-right: -165px;
  }

  .card {
    gap: 16px;
    padding: 14px;
  }

  .card-board {
    width: 84px;
  }

  .card h3 {
    font-size: 18px;
  }

  .post h1 {
    font-size: 31px;
  }

  .lede {
    font-size: 17.5px;
  }

  .prose h2 {
    font-size: 23px;
  }

  .try {
    padding: 24px 22px;
  }

  .pager {
    grid-template-columns: minmax(0, 1fr);
  }

  .diagram {
    padding: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-board,
  .hero:hover .hero-board {
    transition: none;
    transform: rotate(-8deg);
  }
}