/* ==========================================================================
   blongho.com — design system
   Editorial-technical. Two themes, fluid type, no framework, no build step.
   ========================================================================== */

@layer reset, tokens, base, layout, components, blog, utilities;

/* ---------------------------------------------------------------- tokens -- */
@layer tokens {
  :root {
    color-scheme: light dark;

    /* Light palette (the default). Every colour is defined here so that the
       dark blocks below only ever need to override, never introduce. */
    --paper:      oklch(98.4% 0.006 95);
    --paper-2:    oklch(96.2% 0.009 95);
    --paper-3:    oklch(93.6% 0.011 95);
    --ink:        oklch(21% 0.018 55);
    --ink-2:      oklch(43% 0.014 55);
    --ink-3:      oklch(48% 0.014 55);
    --accent:     oklch(52% 0.130 38);
    --accent-hi:  oklch(45% 0.130 38);
    --accent-2:   oklch(48% 0.012 55);
    --invert-bg:  oklch(24% 0.030 50);
    --invert-fg:  oklch(95% 0.010 95);
    --invert-fg-2:oklch(80% 0.022 60);

    --line:        color-mix(in oklch, var(--ink) 13%, transparent);
    --line-2:      color-mix(in oklch, var(--ink) 26%, transparent);
    --accent-wash: color-mix(in oklch, var(--accent) 10%, transparent);
    --shadow:      0 1px 2px color-mix(in oklch, var(--ink) 6%, transparent),
                   0 8px 24px -12px color-mix(in oklch, var(--ink) 22%, transparent);

    /* Fluid type — 360px to 1280px viewport */
    --t-display: clamp(2.55rem, 1.35rem + 5.35vw, 5.1rem);
    --t-h1:      clamp(2.05rem, 1.35rem + 3.1vw, 3.4rem);
    --t-h2:      clamp(1.55rem, 1.25rem + 1.3vw, 2.1rem);
    --t-h3:      clamp(1.1rem, 1.02rem + 0.35vw, 1.28rem);
    --t-lead:    clamp(1.05rem, 0.98rem + 0.35vw, 1.22rem);
    --t-body:    1rem;
    --t-sm:      0.9rem;
    --t-xs:      0.79rem;

    --font-display: 'Fraunces', ui-serif, Georgia, 'Times New Roman', serif;
    --font-body:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono:    'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    /* Spacing */
    --gutter:  clamp(1.25rem, 0.7rem + 2.2vw, 2.25rem);
    --section: clamp(4rem, 2.4rem + 6vw, 7rem);

    --wide:    1140px;
    --measure: 68ch;
    --prose:   36rem;
    --radius:  4px;
    --header-h: 4.25rem;
  }

  /* System dark — only when the user has not pinned light */
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme='light']) {
      --paper:      oklch(16.5% 0.014 55);
      --paper-2:    oklch(20% 0.016 55);
      --paper-3:    oklch(24.5% 0.018 55);
      --ink:        oklch(94% 0.008 95);
      --ink-2:      oklch(76% 0.012 60);
      --ink-3:      oklch(62% 0.014 60);
      --accent:     oklch(76% 0.130 38);
      --accent-hi:  oklch(84% 0.090 38);
      --accent-2:   oklch(66% 0.012 60);
      --invert-bg:  oklch(93% 0.012 95);
      --invert-fg:  oklch(19% 0.020 55);
      --invert-fg-2:oklch(36% 0.020 55);

      --line:        color-mix(in oklch, var(--ink) 15%, transparent);
      --line-2:      color-mix(in oklch, var(--ink) 30%, transparent);
      --accent-wash: color-mix(in oklch, var(--accent) 13%, transparent);
      --shadow:      0 1px 2px oklch(0% 0 0 / 0.4),
                     0 10px 28px -14px oklch(0% 0 0 / 0.7);
    }
  }

  /* Explicit dark — the toggle wins in both directions */
  :root[data-theme='dark'] {
    --paper:      oklch(16.5% 0.014 55);
    --paper-2:    oklch(20% 0.016 55);
    --paper-3:    oklch(24.5% 0.018 55);
    --ink:        oklch(94% 0.008 95);
    --ink-2:      oklch(76% 0.012 60);
    --ink-3:      oklch(62% 0.014 60);
    --accent:     oklch(76% 0.130 38);
    --accent-hi:  oklch(84% 0.090 38);
    --accent-2:   oklch(66% 0.012 60);
    --invert-bg:  oklch(93% 0.012 95);
    --invert-fg:  oklch(19% 0.020 55);
    --invert-fg-2:oklch(36% 0.020 55);

    --line:        color-mix(in oklch, var(--ink) 15%, transparent);
    --line-2:      color-mix(in oklch, var(--ink) 30%, transparent);
    --accent-wash: color-mix(in oklch, var(--accent) 13%, transparent);
    --shadow:      0 1px 2px oklch(0% 0 0 / 0.4),
                   0 10px 28px -14px oklch(0% 0 0 / 0.7);
  }

  :root[data-theme='dark'] { color-scheme: dark; }
  :root[data-theme='light'] { color-scheme: light; }
}

/* ----------------------------------------------------------------- reset -- */
@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  * { margin: 0; }

  html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
    scroll-padding-block-start: calc(var(--header-h) + 1.5rem);
  }

  body {
    min-block-size: 100svh;
    background: var(--paper);
    color: var(--ink);
    font-family: var(--font-body);
    font-size: var(--t-body);
    line-height: 1.62;
    font-synthesis-weight: none;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }

  img, svg, video { display: block; max-inline-size: 100%; height: auto; }
  button, input, select, textarea { font: inherit; color: inherit; }
  button { background: none; border: none; cursor: pointer; }
  ul, ol { list-style: none; padding: 0; }

  :where(h1, h2, h3, h4) { text-wrap: balance; }
  :where(p, li) { text-wrap: pretty; }

  [hidden] { display: none !important; }

  @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;
    }
  }
}

/* ------------------------------------------------------------------ base -- */
@layer base {
  h1, h2, h3 {
    font-family: var(--font-display);
    font-weight: 460;
    letter-spacing: -0.018em;
    line-height: 1.1;
  }

  a { color: inherit; }

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

  ::selection { background: var(--accent); color: var(--paper); }

  .mono {
    font-family: var(--font-mono);
    font-size: var(--t-xs);
    letter-spacing: 0.055em;
    text-transform: uppercase;
    font-weight: 500;
  }

  /* Cross-document view transitions, where supported */
  @view-transition { navigation: auto; }
}

/* ---------------------------------------------------------------- layout -- */
@layer layout {
  .wrap {
    inline-size: min(100% - (var(--gutter) * 2), var(--wide));
    margin-inline: auto;
  }

  main > section { padding-block: var(--section); }
  main > section + section,
  main > section + .band { border-block-start: 1px solid var(--line); }

  .skip-link {
    position: absolute;
    inset-block-start: 0.5rem;
    inset-inline-start: 0.5rem;
    z-index: 100;
    padding: 0.7rem 1.1rem;
    background: var(--ink);
    color: var(--paper);
    border-radius: var(--radius);
    text-decoration: none;
    font-size: var(--t-sm);
    transform: translateY(-160%);
    transition: transform 0.18s ease;
  }
  .skip-link:focus-visible { transform: translateY(0); }
}

/* ------------------------------------------------------------ components -- */
@layer components {

  /* ---- Header ---- */
  header.site {
    position: sticky;
    inset-block-start: 0;
    z-index: 50;
    background: color-mix(in oklch, var(--paper) 82%, transparent);
    border-block-end: 1px solid transparent;
    transition: border-color 0.25s ease, background 0.25s ease;
  }
  @supports (backdrop-filter: blur(1px)) {
    header.site { backdrop-filter: blur(14px) saturate(1.4); }
  }
  header.site[data-scrolled] { border-block-end-color: var(--line); }

  .navrow {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    block-size: var(--header-h);
  }

  .brand {
    font-family: var(--font-display);
    font-size: 1.02rem;
    font-weight: 600;
    letter-spacing: -0.02em;
    text-decoration: none;
    white-space: nowrap;
    margin-inline-end: auto;
  }
  .brand span { color: var(--accent); }

  nav.links { display: flex; gap: clamp(1rem, 2vw, 1.85rem); }
  nav.links a {
    position: relative;
    text-decoration: none;
    font-size: var(--t-sm);
    color: var(--ink-3);
    padding-block: 0.35rem;
    transition: color 0.15s ease;
  }
  nav.links a::after {
    content: '';
    position: absolute;
    inset-block-end: 0;
    inset-inline: 0;
    block-size: 1px;
    background: var(--accent);
    scale: 0 1;
    transform-origin: left;
    transition: scale 0.22s ease;
  }
  nav.links a:hover { color: var(--ink); }
  nav.links a:hover::after,
  nav.links a[aria-current]::after { scale: 1 1; }
  nav.links a[aria-current] { color: var(--ink); }

  .nav-actions { display: flex; align-items: center; gap: 0.6rem; }

  .icon-btn {
    display: grid;
    place-items: center;
    inline-size: 2.3rem;
    block-size: 2.3rem;
    border-radius: var(--radius);
    color: var(--ink-2);
    transition: background 0.15s ease, color 0.15s ease;
  }
  .icon-btn:hover { background: var(--paper-3); color: var(--ink); }
  .icon-btn svg { inline-size: 1.15rem; block-size: 1.15rem; }

  /* The icon shows the theme the button switches *to*, matching its aria-label:
     moon while light (click for dark), sun while dark (click for light). */
  .theme-toggle .i-sun { display: none; }
  :root[data-theme='dark'] .theme-toggle .i-sun  { display: block; }
  :root[data-theme='dark'] .theme-toggle .i-moon { display: none; }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme='light']) .theme-toggle .i-sun  { display: block; }
    :root:not([data-theme='light']) .theme-toggle .i-moon { display: none; }
  }

  .nav-cta {
    border: 1px solid var(--line-2);
    padding: 0.5rem 0.95rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-size: var(--t-sm);
    white-space: nowrap;
    transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
  }
  .nav-cta:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

  .menu-btn { display: none; }

  @media (max-width: 800px) {
    nav.links, .nav-cta { display: none; }
    .menu-btn { display: grid; }
  }
  /* Without JS neither control can work — hide rather than dangle */
  .no-js .menu-btn, .no-js .theme-toggle { display: none; }

  /* ---- Mobile menu ---- */
  #menu {
    position: fixed;
    inset: var(--header-h) 0 0;
    z-index: 45;
    background: var(--paper);
    padding: 2rem var(--gutter) 3rem;
    overflow-y: auto;
    animation: menu-in 0.22s ease both;
  }
  @keyframes menu-in { from { opacity: 0; translate: 0 -0.5rem; } }
  #menu ul { display: grid; gap: 0.25rem; }
  #menu nav a {
    display: block;
    padding-block: 0.85rem;
    border-block-end: 1px solid var(--line);
    text-decoration: none;
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 460;
  }
  #menu .btn { margin-block-start: 1.75rem; }
  body:has(#menu:not([hidden])) { overflow: hidden; }

  /* ---- Buttons ---- */
  .btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.78rem 1.3rem;
    text-decoration: none;
    font-size: var(--t-sm);
    font-weight: 500;
    border-radius: var(--radius);
    border: 1px solid var(--line-2);
    transition: background 0.16s ease, color 0.16s ease,
                border-color 0.16s ease, translate 0.16s ease;
  }
  .btn:hover { translate: 0 -1px; }
  .btn.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
  .btn.primary:hover { background: var(--accent-hi); border-color: var(--accent-hi); color: var(--paper); }
  .btn.ghost:hover { background: var(--paper-3); border-color: var(--line-2); }
  :root[data-theme='dark'] .btn.primary:hover { color: var(--paper); }

  /* ---- Hero ---- */
  .hero { padding-block: clamp(3.5rem, 2rem + 6vw, 6.5rem) var(--section); }
  .hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: start;
  }
  @media (max-width: 900px) {
    .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  }

  .status {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.4rem 0.85rem 0.4rem 0.7rem;
    border: 1px solid var(--line);
    border-radius: 100px;
    background: var(--accent-wash);
    color: var(--ink-2);
    font-size: var(--t-xs);
    margin-block-end: 1.75rem;
  }
  .status .dot {
    inline-size: 0.45rem;
    block-size: 0.45rem;
    border-radius: 50%;
    background: var(--accent);
    flex: none;
  }
  @media (prefers-reduced-motion: no-preference) {
    .status .dot { animation: pulse 2.6s ease-in-out infinite; }
    @keyframes pulse {
      0%, 100% { box-shadow: 0 0 0 0 color-mix(in oklch, var(--accent) 55%, transparent); }
      70%      { box-shadow: 0 0 0 6px transparent; }
    }
  }

  .hero h1 {
    font-size: var(--t-display);
    line-height: 1.02;
    letter-spacing: -0.032em;
    font-weight: 430;
    font-variation-settings: 'opsz' 96;
  }
  .hero h1 em {
    font-style: normal;
    color: var(--accent);
  }
  .hero-sub {
    margin-block-start: 1.75rem;
    max-inline-size: 54ch;
    font-size: var(--t-lead);
    color: var(--ink-2);
    line-height: 1.66;
  }
  .hero-sub strong { font-weight: 600; color: var(--ink); }

  .hero-actions {
    margin-block-start: 2.25rem;
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
  }

  /* Spec card — the hero's right rail */
  .spec {
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--paper-2);
    overflow: hidden;
  }
  .spec dt {
    font-family: var(--font-mono);
    font-size: var(--t-xs);
    letter-spacing: 0.055em;
    text-transform: uppercase;
    color: var(--ink-3);
  }
  .spec dd { margin: 0.3rem 0 0; font-size: 0.95rem; }
  .spec > div {
    padding: 1rem 1.15rem;
    border-block-start: 1px solid var(--line);
  }
  .spec > div:first-child { border-block-start: none; }

  /* ---- Section headings ---- */
  .section-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 1.25rem;
    flex-wrap: wrap;
    margin-block-end: clamp(2rem, 4vw, 3rem);
    padding-block-end: 1rem;
    border-block-end: 1px solid var(--line-2);
  }
  .section-head h2 { font-size: var(--t-h2); }
  .section-head .eyebrow { color: var(--ink-3); }
  .section-head .eyebrow b { color: var(--accent); font-weight: 500; }

  /* ---- Experience timeline ---- */
  .timeline { display: grid; }
  .role {
    display: grid;
    grid-template-columns: 10.5rem 1fr;
    gap: clamp(1rem, 3vw, 2rem);
    padding-block: 1.75rem;
    border-block-start: 1px solid var(--line);
    transition: background 0.2s ease;
  }
  .role:first-child { border-block-start: none; }
  .role:hover { background: var(--paper-2); }
  @media (max-width: 720px) {
    .role { grid-template-columns: 1fr; gap: 0.5rem; }
  }
  .role .when { color: var(--ink-3); padding-block-start: 0.3rem; }
  .role h3 {
    font-family: var(--font-body);
    font-size: var(--t-h3);
    font-weight: 600;
    letter-spacing: -0.005em;
  }
  .role .org { color: var(--accent); font-weight: 500; font-size: var(--t-sm); margin-block-start: 0.15rem; }
  .role p { margin-block-start: 0.7rem; color: var(--ink-2); max-inline-size: var(--measure); }

  .stack { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-block-start: 0.9rem; }
  .tag {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.03em;
    padding: 0.2rem 0.55rem;
    border: 1px solid var(--line);
    border-radius: 100px;
    color: var(--ink-3);
    background: var(--paper-2);
    white-space: nowrap;
  }

  /* ---- Projects ---- */
  .projects {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));
    gap: 1rem;
  }
  .proj {
    container-type: inline-size;
    display: flex;
    flex-direction: column;
    padding: 1.6rem 1.5rem;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: var(--paper-2);
    position: relative;
    isolation: isolate;
    transition: border-color 0.2s ease, translate 0.2s ease, box-shadow 0.2s ease;
  }
  .proj::before {
    content: '';
    position: absolute;
    inset-block-start: -1px;
    inset-inline: -1px;
    block-size: 2px;
    border-radius: var(--radius) var(--radius) 0 0;
    background: var(--accent);
    opacity: 0;
    transition: opacity 0.2s ease;
  }
  .proj:hover { border-color: var(--line-2); translate: 0 -2px; box-shadow: var(--shadow); }
  .proj:hover::before { opacity: 1; }
  /* neutral: the accent is the page's only chromatic voice */
  .proj .plabel { color: var(--ink-3); margin-block-end: 0.7rem; }
  .proj h3 { font-size: 1.24rem; }
  .proj p { margin-block-start: 0.65rem; color: var(--ink-2); font-size: 0.96rem; }
  .proj h3 a {
    text-decoration: none;
    background-image: linear-gradient(var(--accent), var(--accent));
    background-size: 0 1px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    transition: background-size 0.25s ease, color 0.15s ease;
  }
  .proj:hover h3 a { background-size: 100% 1px; color: var(--accent); }
  .proj .plink {
    align-self: flex-start;
    margin-block-start: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-family: var(--font-mono);
    font-size: var(--t-xs);
    letter-spacing: 0.04em;
    color: var(--accent);
    text-decoration: none;
    padding-block: 0.2rem;
  }
  .proj .plink:hover { text-decoration: underline; text-underline-offset: 0.25em; }
  .plinks {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1rem;
    margin-block-start: 0.9rem;
  }
  .plinks .plink { margin-block-start: 0; }

  /* ---- Research ---- */
  .papers { display: grid; }
  .paper {
    display: grid;
    grid-template-columns: 10.5rem 1fr;
    gap: clamp(1rem, 3vw, 2rem);
    padding-block: 1.75rem;
    border-block-start: 1px solid var(--line);
    transition: background 0.2s ease;
  }
  .paper:first-child { border-block-start: none; }
  .paper:hover { background: var(--paper-2); }
  @media (max-width: 720px) {
    .paper { grid-template-columns: 1fr; gap: 0.5rem; }
  }
  .paper .venue { color: var(--ink-3); padding-block-start: 0.3rem; }
  .paper h3 {
    font-family: var(--font-body);
    font-size: var(--t-h3);
    font-weight: 600;
    letter-spacing: -0.005em;
  }
  .paper > div > p { margin-block-start: 0.7rem; color: var(--ink-2); max-inline-size: var(--measure); }
  .paper .result {
    margin-block-start: 0.9rem;
    padding: 0.6rem 0.9rem;
    border-inline-start: 2px solid var(--accent);
    background: var(--accent-wash);
    border-radius: 0 var(--radius) var(--radius) 0;
    font-size: 0.92rem;
    color: var(--ink);
    max-inline-size: var(--measure);
  }
  .paper .result b { font-weight: 600; }
  .proj .stack { margin-block-start: auto; padding-block-start: 1.1rem; }
  @container (min-width: 26rem) {
    .proj { padding: 1.9rem 1.8rem; }
    .proj h3 { font-size: 1.35rem; }
  }

  /* ---- Skills ---- */
  .skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 14rem), 1fr));
    gap: clamp(1.25rem, 3vw, 2.25rem);
  }
  .skill-group .g-title {
    color: var(--ink-3);
    padding-block-end: 0.6rem;
    border-block-end: 1px solid var(--line-2);
    margin-block-end: 0.35rem;
  }
  .skill-group .g-title::before {
    content: '';
    display: inline-block;
    inline-size: 0.4rem;
    block-size: 0.4rem;
    background: var(--accent);
    margin-inline-end: 0.5rem;
    vertical-align: 0.08em;
  }
  .skill-group li {
    padding-block: 0.42rem;
    border-block-start: 1px solid var(--line);
    font-size: 0.94rem;
    color: var(--ink-2);
  }
  .skill-group li:first-child { border-block-start: none; }

  /* ---- Inverted band (origin story) ---- */
  .band {
    background: var(--invert-bg);
    color: var(--invert-fg);
    padding-block: var(--section);
  }
  .band h2 { font-size: var(--t-h2); color: var(--invert-fg); margin-block-end: 1.25rem; }
  .band p { color: var(--invert-fg-2); max-inline-size: 62ch; font-size: var(--t-lead); }
  .band p + p { margin-block-start: 1rem; }
  .band .sig {
    margin-block-start: 1.75rem;
    color: color-mix(in oklch, var(--invert-fg-2) 80%, transparent);
  }

  /* ---- Contact ---- */
  .contact h2 { font-size: var(--t-h1); max-inline-size: 18ch; }
  .contact p { margin-block-start: 1rem; max-inline-size: 56ch; color: var(--ink-2); font-size: var(--t-lead); }
  .contact-row { margin-block-start: 2rem; display: flex; flex-wrap: wrap; gap: 0.75rem; }

  /* ---- Footer ---- */
  footer.site {
    border-block-start: 1px solid var(--line);
    padding-block: 2rem 2.75rem;
    color: var(--ink-3);
    font-size: var(--t-sm);
  }
  footer.site .wrap {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
  }
  footer.site nav { display: flex; gap: 0.4rem 1.1rem; flex-wrap: wrap; margin-block: -0.35rem; }
  footer.site a {
    text-decoration: none;
    /* padding keeps the hit area >= 24px (WCAG 2.2 target size) */
    padding-block: 0.35rem;
  }
  footer.site a:hover { color: var(--ink); }

  /* ---- Scroll reveal (CSS-only, progressive) ---- */
  @media (prefers-reduced-motion: no-preference) {
    @supports (animation-timeline: view()) {
      .reveal {
        animation: reveal linear both;
        animation-timeline: view();
        animation-range: entry 8% cover 26%;
      }
      @keyframes reveal {
        from { opacity: 0; translate: 0 1.25rem; }
        to   { opacity: 1; translate: 0 0; }
      }
    }
  }
}

/* ------------------------------------------------------------------ blog -- */
@layer blog {
  .page-head { padding-block: clamp(3rem, 2rem + 4vw, 5rem) 0; }
  .page-head h1 { font-size: var(--t-h1); }
  .page-head .lead {
    margin-block-start: 1.1rem;
    max-inline-size: 56ch;
    color: var(--ink-2);
    font-size: var(--t-lead);
  }

  .posts { display: grid; }
  .post-item {
    display: grid;
    grid-template-columns: 10.5rem 1fr;
    gap: clamp(1rem, 3vw, 2rem);
    padding-block: 1.9rem;
    border-block-start: 1px solid var(--line);
    transition: background 0.2s ease;
  }
  .post-item:first-child { border-block-start: none; }
  .post-item:hover { background: var(--paper-2); }
  @media (max-width: 720px) {
    .post-item { grid-template-columns: 1fr; gap: 0.5rem; }
  }
  .post-item time { color: var(--ink-3); padding-block-start: 0.3rem; display: block; }
  .post-item h2 { font-size: 1.35rem; }
  .post-item h2 a {
    text-decoration: none;
    background-image: linear-gradient(var(--accent), var(--accent));
    background-size: 0 1px;
    background-position: 0 100%;
    background-repeat: no-repeat;
    transition: background-size 0.25s ease, color 0.15s ease;
  }
  .post-item h2 a:hover { color: var(--accent); background-size: 100% 1px; }
  .post-item p { margin-block-start: 0.6rem; color: var(--ink-2); max-inline-size: var(--measure); }

  /* Single post */
  .post-head { padding-block: clamp(3rem, 2rem + 4vw, 4.5rem) 2.25rem; }
  .post-head .pmeta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
    color: var(--ink-3);
    margin-block-end: 1.35rem;
  }
  .post-head h1 { font-size: var(--t-h1); line-height: 1.08; max-inline-size: 20ch; }
  .post-head .dek {
    margin-block-start: 1.15rem;
    font-size: var(--t-lead);
    color: var(--ink-2);
    max-inline-size: 56ch;
  }

  .post-body {
    inline-size: min(100% - (var(--gutter) * 2), var(--prose));
    margin-inline: auto;
    padding-block: 2.75rem 2rem;
    font-size: 1.06rem;
    line-height: 1.75;
  }
  .post-body > * + * { margin-block-start: 1.25em; }
  .post-body h2 {
    font-size: 1.42rem;
    margin-block-start: 2.2em;
    margin-block-end: -0.35em;
  }
  .post-body h3 {
    font-family: var(--font-body);
    font-size: 1.12rem;
    font-weight: 600;
    margin-block-start: 1.9em;
    margin-block-end: -0.4em;
  }
  .post-body a {
    color: var(--accent-hi);
    text-underline-offset: 0.18em;
    text-decoration-thickness: 1px;
    text-decoration-color: color-mix(in oklch, var(--accent) 45%, transparent);
  }
  .post-body a:hover { text-decoration-color: var(--accent); }
  .post-body ul, .post-body ol { padding-inline-start: 1.3em; }
  .post-body ul li { list-style: disc; }
  .post-body ol li { list-style: decimal; }
  .post-body li + li { margin-block-start: 0.4em; }
  .post-body li::marker { color: var(--ink-3); }
  .post-body code {
    font-family: var(--font-mono);
    font-size: 0.86em;
    background: var(--paper-3);
    padding: 0.12em 0.38em;
    border-radius: 3px;
  }
  .post-body pre {
    background: oklch(19% 0.018 55);
    color: oklch(93% 0.010 95);
    padding: 1.15rem 1.25rem;
    border-radius: var(--radius);
    border: 1px solid var(--line);
    overflow-x: auto;
    font-size: 0.88rem;
    line-height: 1.6;
    tab-size: 2;
  }
  .post-body pre code { background: none; padding: 0; font-size: inherit; color: inherit; }
  .post-body blockquote {
    border-inline-start: 2px solid var(--accent);
    padding-inline-start: 1.15rem;
    color: var(--ink-2);
    font-style: italic;
  }
  .post-body hr { border: none; border-block-start: 1px solid var(--line); margin-block: 2.4em; }
  .post-body img { border-radius: var(--radius); margin-inline: auto; }
  .post-body figcaption {
    font-size: var(--t-sm);
    color: var(--ink-3);
    text-align: center;
    margin-block-start: 0.6rem;
  }

  .post-foot {
    inline-size: min(100% - (var(--gutter) * 2), var(--prose));
    margin-inline: auto;
    padding-block-end: 4rem;
  }
  .back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    text-decoration: none;
    font-size: var(--t-sm);
    color: var(--ink-3);
    padding-block-start: 1.6rem;
    border-block-start: 1px solid var(--line);
    inline-size: 100%;
    transition: color 0.15s ease;
  }
  .back-link:hover { color: var(--accent); }
  .back-link:hover span { translate: -0.2rem 0; }
  .back-link span { display: inline-block; transition: translate 0.18s ease; }
}

/* ------------------------------------------------------------- utilities -- */
@layer utilities {
  .visually-hidden {
    position: absolute;
    inline-size: 1px;
    block-size: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  @media print {
    header.site, footer.site, .hero-actions, .contact-row, .back-link,
    .nav-actions, #menu { display: none !important; }
    :root { --paper: #fff; --paper-2: #fff; --paper-3: #fff; --ink: #000; --ink-2: #222; --ink-3: #555; }
    body { font-size: 11pt; }
    /* view() timelines don't resolve in paged media — force the end state
       so printed pages can never come out with blank sections */
    .reveal { animation: none !important; opacity: 1 !important; translate: none !important; }
    main > section { padding-block: 1.5rem; break-inside: avoid; }
    .role, .proj, .post-item { break-inside: avoid; }
    a[href^='http']::after { content: ' (' attr(href) ')'; font-size: 0.8em; color: #555; }
  }
}