/* Self-hosted Latin subsets — Atkinson Hyperlegible + JetBrains Mono */
@font-face {
  font-family: "Atkinson Hyperlegible";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/atkinson-400.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Atkinson Hyperlegible";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("/fonts/atkinson-700.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Atkinson Hyperlegible";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/atkinson-400-italic.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "Atkinson Hyperlegible";
  font-style: italic;
  font-weight: 700;
  font-display: swap;
  src: url("/fonts/atkinson-700-italic.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/jetbrains-mono-400.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("/fonts/jetbrains-mono-500.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
:root {
  --ink: #0b1220;
  --ink-soft: #243044;
  --paper: #fafbfc;
  --paper-deep: #f0f2f5;
  --sapphire: #1546e8;
  --sapphire-deep: #0f35b5;
  --mist: #5c6b7e;
  --line: #e2e6ec;
  --focus: #1546e8;
  --radius: 10px;
  --shadow-soft: 0 2px 4px rgba(11, 18, 32, 0.04), 0 12px 28px rgba(11, 18, 32, 0.06);
  --shadow-card: 0 1px 2px rgba(11, 18, 32, 0.04), 0 10px 32px rgba(11, 18, 32, 0.08);
  --transition: 220ms ease;
  --sidebar-w: 20rem;
  --sidebar-w-xl: 24rem;
  --sidebar-inset: 0.75rem;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --mobile-bar-h: 3.75rem;
}

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: "Atkinson Hyperlegible", ui-sans-serif, system-ui, sans-serif;
  background: var(--paper);
  color: var(--ink-soft);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
  overflow-x: clip;
  touch-action: manipulation;
}

a { color: inherit; text-decoration: none; }

.font-display {
  font-family: "Atkinson Hyperlegible", ui-sans-serif, system-ui, sans-serif;
  font-weight: 700;
}

.font-mono-label {
  font-family: "JetBrains Mono", ui-monospace, monospace;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.72rem;
  font-weight: 500;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100px;
  z-index: 100;
  background: var(--ink);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 8px;
  font-weight: 700;
}

.skip-link:focus { top: 1rem; }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.85rem 1.5rem;
  background: var(--sapphire);
  color: #fff;
  font-weight: 700;
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  transition: background var(--transition), transform var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary:hover {
  background: var(--sapphire-deep);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.85rem 1.5rem;
  background: transparent;
  color: var(--ink);
  font-weight: 700;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--transition), background var(--transition);
  cursor: pointer;
}

.btn-secondary:hover {
  border-color: var(--sapphire);
  background: rgba(21, 70, 232, 0.04);
}

.btn-secondary:active {
  transform: scale(0.98);
  background: rgba(21, 70, 232, 0.06);
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  min-width: 44px;
  min-height: 44px;
  padding: 0.5rem 0.75rem;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.9);
  color: var(--ink-soft);
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}

.icon-btn:hover {
  border-color: var(--sapphire);
  color: var(--sapphire-deep);
  background: #fff;
}

/* —— Shell / sidebar (matches home) —— */
.shell {
  display: flex;
  min-height: 100vh;
}

.left-nav {
  display: none;
  position: fixed;
  top: var(--sidebar-inset);
  left: var(--sidebar-inset);
  z-index: 40;
  height: calc(100% - (var(--sidebar-inset) * 2));
  width: calc(var(--sidebar-w) - (var(--sidebar-inset) * 2));
  padding: 2.25rem 2rem;
  flex-direction: column;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--line);
  border-radius: 1rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}

@media (min-width: 1024px) {
  .left-nav {
    display: flex;
  }
}

@media (min-width: 1280px) {
  .left-nav {
    width: calc(var(--sidebar-w-xl) - (var(--sidebar-inset) * 2));
  }
}

.left-nav-brand {
  margin-bottom: 3rem;
}

.left-nav-brand .name {
  margin: 0;
  font-size: 2.25rem;
  color: var(--ink);
  letter-spacing: -0.02em;
  line-height: 1;
  text-decoration: none;
  display: inline-block;
  transition: color 0.2s ease;
}

.left-nav-brand .name:hover {
  color: var(--sapphire-deep);
}

.left-nav-brand .role {
  display: inline-block;
  margin-top: 0.75rem;
  color: var(--mist);
  font-weight: 500;
}

.left-nav-brand .role:hover {
  color: var(--sapphire);
}

.nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  color: var(--ink-soft);
  transition: background var(--transition), color var(--transition);
}

.nav-list a:hover {
  background: rgba(21, 70, 232, 0.06);
  color: var(--sapphire-deep);
}

.nav-list a .nav-rule {
  width: 2rem;
  height: 1px;
  background: var(--line);
  transition: width var(--transition), background var(--transition);
}

.nav-list a:hover .nav-rule,
.nav-list a[aria-current="page"] .nav-rule {
  width: 1.5rem;
  background: var(--sapphire);
}

.nav-list a[aria-current="page"] {
  color: var(--sapphire-deep);
  background: rgba(21, 70, 232, 0.08);
  font-weight: 700;
}

.nav-list li + li {
  margin-top: 0.25rem;
}

.social-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0 0 1.25rem;
  padding: 0;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--mist);
  border-radius: 8px;
  transition: color var(--transition), background var(--transition);
}

.social-link:hover,
.social-link:active {
  color: var(--sapphire);
  background: rgba(21, 70, 232, 0.08);
}

.main-pane {
  width: 100%;
  margin-left: 0;
  position: relative;
  transition: margin-left var(--transition), width var(--transition);
}

@media (min-width: 1024px) {
  .main-pane {
    margin-left: var(--sidebar-w);
    width: calc(100% - var(--sidebar-w));
  }
}

@media (min-width: 1280px) {
  .main-pane {
    margin-left: var(--sidebar-w-xl);
    width: calc(100% - var(--sidebar-w-xl));
  }
}

.main-inner {
  padding:
    calc(var(--mobile-bar-h) + var(--safe-top) + 1.25rem)
    max(1.25rem, var(--safe-right))
    calc(3rem + var(--safe-bottom))
    max(1.25rem, var(--safe-left));
}

@media (max-width: 379px) {
  .main-inner {
    padding-left: max(1rem, var(--safe-left));
    padding-right: max(1rem, var(--safe-right));
  }

  .prose p,
  .prose li {
    font-size: 1.05rem;
  }

  .font-display.name {
    font-size: 1.85rem;
  }
}

@media (min-width: 640px) and (max-width: 1023px) {
  .main-inner {
    padding-top: calc(var(--mobile-bar-h) + var(--safe-top) + 1.5rem);
    padding-left: max(2rem, var(--safe-left));
    padding-right: max(2rem, var(--safe-right));
    padding-bottom: calc(3.5rem + var(--safe-bottom));
  }
}

@media (min-width: 1024px) {
  .main-inner {
    padding: 2.5rem 4rem 4rem;
  }
}

@media (min-width: 1280px) {
  .main-inner {
    padding: 3rem 5rem 5rem;
  }
}

/* Collapse / full-width reading */
html[data-sidebar="collapsed"] .left-nav {
  transform: translateX(-105%);
  pointer-events: none;
}

html[data-sidebar="collapsed"] .main-pane,
html[data-sidebar="collapsed"] .main-content-area,
html[data-sidebar="collapsed"] main#main-content.main-content-area {
  margin-left: 0 !important;
  width: 100% !important;
}

.sidebar-toggle {
  display: none;
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 45;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  box-shadow: var(--shadow-soft);
}

@media (min-width: 1024px) {
  .sidebar-toggle {
    display: inline-flex;
  }
}

.sidebar-toggle .icon-close {
  display: none;
}

html[data-sidebar="collapsed"] .sidebar-toggle .icon-expand {
  display: none;
}

html[data-sidebar="collapsed"] .sidebar-toggle .icon-close {
  display: block;
}

html[data-sidebar="collapsed"] .main-inner {
  max-width: 48rem;
  margin-inline: auto;
}

html[data-sidebar="collapsed"] .prose,
html[data-sidebar="collapsed"] .page-footer,
html[data-sidebar="collapsed"] .blog-card {
  margin-inline: auto;
}

/* Mobile chrome */
.mobile-bar {
  display: flex;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  min-height: calc(var(--mobile-bar-h) + var(--safe-top));
  padding:
    calc(0.7rem + var(--safe-top))
    max(1rem, var(--safe-right))
    0.7rem
    max(1rem, var(--safe-left));
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.mobile-bar > a {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-size: clamp(1.2rem, 4.5vw, 1.35rem);
  max-width: calc(100% - 3.5rem);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

@media (min-width: 1024px) {
  .mobile-bar { display: none; }
}

.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(0, 0, 0, 0.5);
}

.mobile-overlay.is-open { display: block; }

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 50;
  height: 100%;
  height: 100dvh;
  width: min(88vw, 22rem);
  max-width: 24rem;
  background: #fff;
  transform: translateX(100%);
  transition: transform 0.28s ease-out;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
  padding-right: var(--safe-right);
  padding-bottom: var(--safe-bottom);
}

.mobile-drawer.is-open {
  transform: translateX(0);
}

.mobile-drawer-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  padding:
    calc(1.25rem + var(--safe-top))
    1.25rem
    1.5rem;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

.mobile-drawer .close-btn {
  position: absolute;
  top: calc(0.65rem + var(--safe-top));
  right: max(0.65rem, var(--safe-right));
}

.mobile-nav-list {
  list-style: none;
  margin: 0 0 auto;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mobile-nav-list a {
  display: flex;
  align-items: center;
  min-height: 48px;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--ink);
  transition: background var(--transition), color var(--transition);
}

.mobile-nav-list a:hover,
.mobile-nav-list a:active,
.mobile-nav-list a[aria-current="page"] {
  background: rgba(21, 70, 232, 0.08);
  color: var(--sapphire-deep);
}

@media (max-width: 1023px) {
  .blog-meta {
    gap: 0.35rem 0.75rem;
    font-size: 0.9rem;
  }

  .blog-card h2 {
    font-size: clamp(1.2rem, 4.8vw, 1.65rem);
  }

  .page-footer {
    flex-direction: column;
    gap: 0.5rem;
  }
}

.page-footer {
  max-width: 48rem;
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: space-between;
  color: var(--mist);
  font-size: 0.95rem;
}

.page-footer a:hover {
  color: var(--sapphire);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.post-nav {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin: 2.5rem 0 0;
  padding-top: 1.75rem;
  border-top: 1px solid var(--line);
}

@media (min-width: 640px) {
  .post-nav {
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }
}

.post-nav__link {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-height: 72px;
  padding: 1rem 1.1rem;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.7);
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}

.post-nav__link:hover {
  border-color: var(--sapphire);
  background: #fff;
}

.post-nav__title {
  color: var(--ink);
  font-weight: 700;
  font-size: 1.02rem;
  line-height: 1.3;
}

.post-nav__next {
  text-align: left;
}

@media (min-width: 640px) {
  .post-nav__next {
    text-align: right;
    align-items: flex-end;
  }
}

.post-nav__disabled {
  opacity: 0.55;
  pointer-events: none;
}

/* Presentation deck dock */
.deck-dock {
  position: fixed;
  left: 50%;
  bottom: calc(1rem + var(--safe-bottom));
  transform: translateX(-50%);
  z-index: 60;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: var(--shadow-soft);
  max-width: calc(100vw - 1.5rem);
}

.deck-dock__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  min-height: 48px;
  padding: 0;
  border: none;
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  cursor: pointer;
  transition: background var(--transition), color var(--transition), opacity var(--transition);
}

.deck-dock__btn:hover:not(:disabled) {
  background: rgba(21, 70, 232, 0.08);
  color: var(--sapphire-deep);
}

.deck-dock__btn:active:not(:disabled) {
  transform: scale(0.96);
}

.deck-dock__btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.deck-dock__meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 7.5rem;
  padding: 0 0.5rem;
  text-align: center;
  line-height: 1.2;
}

.deck-dock__label {
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--ink);
  white-space: nowrap;
}

.deck-dock__progress {
  margin-top: 0.15rem;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mist);
}

body {
  padding-bottom: calc(5.5rem + var(--safe-bottom));
}

@media (max-width: 379px) {
  .deck-dock__meta { min-width: 5.5rem; }
  .deck-dock__label { font-size: 0.8rem; }
}

/* Blog content */
.prose {
  max-width: 42rem;
}

.prose h2 {
  color: var(--ink);
  font-size: 1.5rem;
  margin: 2.25rem 0 0.85rem;
  line-height: 1.25;
}

.prose h3 {
  color: var(--ink);
  font-size: 1.2rem;
  margin: 1.75rem 0 0.6rem;
}

.prose p,
.prose li {
  font-size: 1.125rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

.prose p { margin: 0 0 1.15rem; }

.prose ul,
.prose ol {
  margin: 0 0 1.25rem;
  padding-left: 1.25rem;
}

.prose li { margin-bottom: 0.5rem; }

.prose a {
  color: var(--sapphire);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.blog-card {
  display: block;
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
  transition: color var(--transition);
  max-width: 48rem;
}

.blog-card:hover h2 { color: var(--sapphire-deep); }

.blog-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  color: var(--mist);
  font-size: 0.95rem;
  margin-bottom: 0.65rem;
}

.tag {
  display: inline-block;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--sapphire);
  font-weight: 500;
}