@layer reset, tokens, base, layout, components, motion;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  * { margin: 0; }
  button, input, textarea { font: inherit; color: inherit; }
  img, svg { display: block; max-width: 100%; }
}

@layer tokens {
  :root {
    color-scheme: light dark;
    /* Chart-paper and ink, with red-dirt orange as the single accent. */
    --bg: light-dark(oklch(95.5% 0.018 85), oklch(17% 0.03 250));
    --surface: light-dark(oklch(98.5% 0.01 85), oklch(21% 0.032 250));
    --fg: light-dark(oklch(21% 0.025 255), oklch(94% 0.012 85));
    --muted: light-dark(oklch(46% 0.025 255), oklch(72% 0.02 250));
    --border: light-dark(oklch(21% 0.025 255 / 0.18), oklch(94% 0.012 85 / 0.16));
    --grid: light-dark(oklch(21% 0.025 255 / 0.05), oklch(94% 0.012 85 / 0.045));
    --accent: light-dark(oklch(57% 0.19 40), oklch(72% 0.17 50));
    --ok: light-dark(oklch(44% 0.13 150), oklch(78% 0.15 150));
    --err: light-dark(oklch(50% 0.2 25), oklch(75% 0.16 25));
    --radius: 0.25rem;
    --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.125rem);
    --step-2: clamp(1.75rem, 1.4rem + 1.6vw, 2.75rem);
    --step-5: clamp(2.75rem, 1.2rem + 6vw, 5.5rem);
    --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
    --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  }
  :root[data-theme="light"] { color-scheme: light; }
  :root[data-theme="dark"] { color-scheme: dark; }
}

@layer base {
  @view-transition { navigation: auto; }
  html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
  body {
    min-height: 100dvh;
    font: var(--step-0)/1.65 var(--font);
    color: var(--fg);
    background:
      linear-gradient(var(--grid) 1px, transparent 1px) 0 0 / 100% 4rem,
      linear-gradient(90deg, var(--grid) 1px, transparent 1px) 0 0 / 4rem 100%,
      var(--bg);
    -webkit-font-smoothing: antialiased;
    overflow-x: clip;
  }
  h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.02; letter-spacing: -0.025em; text-wrap: balance; }
  p { text-wrap: pretty; }
  a { color: inherit; text-decoration-color: var(--accent); text-decoration-thickness: 2px; text-underline-offset: 0.22em; }
  a:hover { color: var(--accent); }
  :focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
  ::selection { background: var(--accent); color: var(--bg); }
}

@layer layout {
  .site-header, main, .site-footer { width: min(100% - 2.5rem, 70rem); margin-inline: auto; }
  main { padding-block: 1rem 5rem; display: grid; gap: clamp(4rem, 9vw, 8rem); }
  .site-header {
    position: sticky; top: 0; z-index: 10; width: 100%; padding-inline: max(1.25rem, calc((100% - 70rem) / 2));
    display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 1rem;
    padding-block: 0.9rem; border-bottom: 1px solid var(--border);
    background: var(--bg);
    nav { display: flex; align-items: center; justify-content: flex-end; gap: 1.5rem; font-size: 0.95rem; }
    nav a { text-decoration: none; padding-block: 0.2rem; border-bottom: 2px solid transparent;
      &:hover, &[aria-current] { color: var(--fg); border-color: var(--accent); } }
  }
  .site-footer { padding-block: 1.5rem 2.5rem; display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
    border-top: 1px solid var(--border); color: var(--muted); font: 0.8rem var(--mono); text-transform: uppercase; letter-spacing: 0.06em; }
  .section-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 1rem; margin-bottom: 2.5rem; padding-bottom: 1rem; border-bottom: 2px solid var(--fg); }
  h2 { font-size: var(--step-2); sup { font: 0.9rem var(--mono); color: var(--accent); vertical-align: super; margin-left: 0.3rem; } }
}

@layer components {
  .brand { font: 700 1.15rem var(--serif); text-decoration: none; letter-spacing: -0.01em; }
  .altimeter { font: 0.75rem var(--mono); letter-spacing: 0.08em; color: var(--muted); display: flex; gap: 0.5rem; align-items: baseline; justify-content: center; white-space: nowrap;
    span { color: var(--accent); } output { font-variant-numeric: tabular-nums; min-inline-size: 7ch; }
    .pos { color: var(--muted); padding-inline-start: 0.9rem; margin-inline-start: 0.4rem; border-inline-start: 1px solid var(--border); } }

  #theme-toggle {
    inline-size: 2rem; aspect-ratio: 1; border-radius: 50%; cursor: pointer;
    border: 1.5px solid var(--fg); background: transparent;
    display: grid; place-items: center;
    span { inline-size: 0.8rem; aspect-ratio: 1; border-radius: 50%; background: var(--fg); clip-path: inset(0 0 0 50%); transition: rotate 0.4s; }
    &:hover span { rotate: 180deg; }
  }

  .hero { position: relative; isolation: isolate; padding-block: clamp(2rem, 6vw, 4.5rem) 2rem; display: grid; gap: 1.5rem; justify-items: start;
    h1 { font-size: var(--step-5); max-inline-size: 13ch; line-height: 0.95;
      span { display: block; font-style: italic; font-weight: 400; color: var(--accent); } }
    .lead { max-inline-size: 36ch; }
  }
  .trace { position: absolute; z-index: -1; inset: auto 0 0 auto; inline-size: min(100%, 62rem); block-size: auto;
    @media (min-width: 52rem) { inline-size: 58%; inset-block-end: 0; translate: 0 -1rem; }
    path { fill: none; stroke: var(--accent); stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 1; stroke-dashoffset: 0; vector-effect: non-scaling-stroke; opacity: 0.55; }
    circle { fill: var(--accent); transform-box: fill-box; transform-origin: center; } }
  .eyebrow { font: 0.78rem/1.3 var(--mono); text-transform: uppercase; letter-spacing: 0.1em; color: var(--muted); }
  .lead { font-size: calc(var(--step-0) * 1.2); color: var(--muted); max-inline-size: 42ch; }
  .cta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 0.5rem; }

  .btn {
    display: inline-flex; gap: 0.5rem; align-items: center; padding: 0.8rem 1.4rem; border-radius: var(--radius); cursor: pointer; text-decoration: none; font-weight: 600;
    border: 2px solid var(--fg); color: var(--bg); background: var(--fg);
    transition: translate 0.15s, box-shadow 0.15s, background 0.15s;
    &:hover { color: var(--bg); background: var(--accent); border-color: var(--accent); translate: -2px -2px; box-shadow: 4px 4px 0 var(--fg); }
    &:disabled { opacity: 0.6; cursor: wait; }
    &.ghost { background: transparent; color: var(--fg); &:hover { color: var(--fg); background: var(--surface); border-color: var(--fg); } }
  }

  .ticker { overflow: hidden; border-block: 2px solid var(--fg); padding-block: 0.7rem; white-space: nowrap; font: 0.9rem var(--mono); text-transform: uppercase; letter-spacing: 0.12em;
    display: flex; inline-size: 100vw; margin-inline: calc(50% - 50vw); background: var(--fg); color: var(--bg);
    span { flex: none; padding-inline-end: 0; } }

  .filters { display: flex; flex-wrap: wrap; gap: 0.4rem; }
  .chip {
    padding: 0.25rem 0.7rem; border-radius: 999px; cursor: pointer; font: 0.75rem var(--mono); text-transform: uppercase; letter-spacing: 0.05em;
    border: 1.5px solid var(--border); background: transparent; color: var(--muted); transition: all 0.15s;
    &:hover { color: var(--fg); border-color: var(--fg); }
    &[aria-pressed="true"] { background: var(--accent); color: var(--bg); border-color: var(--accent); }
  }

  .cards { list-style: none; padding: 0; display: grid; gap: clamp(3.5rem, 8vw, 6.5rem); }
  .card {
    display: grid; gap: 1.5rem 3rem; align-items: center;
    @media (min-width: 52rem) {
      grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
      &:nth-child(even) { .card-text { order: 2; } }
    }
    &[hidden] { display: none; }
    .card-text { display: grid; gap: 0.9rem; align-content: start; }
    h3 { font-size: clamp(2.25rem, 1.5rem + 3vw, 4rem); a { text-decoration: none; &:hover { color: var(--accent); } &::after { content: ""; position: absolute; inset: 0; } } }
    p { color: var(--muted); }
    .year { font: 0.8rem var(--mono); letter-spacing: 0.08em; span { color: var(--accent); } }
    position: relative;
    &:hover .frame { translate: 0 -6px; box-shadow: 10px 10px 0 var(--accent); }
  }

  .tags { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 0.35rem; margin-top: 0.2rem;
    li { font: 0.72rem var(--mono); text-transform: uppercase; letter-spacing: 0.05em; padding: 0.15rem 0.5rem; border: 1px solid var(--border); color: var(--muted); }
  }

  /* Browser-window frame around screenshots. */
  .frame { border: 2px solid var(--fg); border-radius: var(--radius); background: var(--surface); overflow: hidden; box-shadow: 8px 8px 0 var(--fg); transition: translate 0.25s, box-shadow 0.25s;
    .bar { display: flex; align-items: center; gap: 0.35rem; padding: 0.45rem 0.7rem; border-bottom: 2px solid var(--fg); background: var(--bg);
      i { inline-size: 0.6rem; aspect-ratio: 1; border-radius: 50%; border: 1.5px solid var(--fg); }
      i:first-child { background: var(--accent); }
      span { margin-left: 0.6rem; font: 0.72rem var(--mono); color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; } }
    img { inline-size: 100%; block-size: auto; aspect-ratio: 16 / 10; object-fit: cover; object-position: top; }
  }

  .project { display: grid; gap: 1.5rem; justify-items: start; padding-top: 2rem;
    h1 { font-size: var(--step-5); line-height: 0.95; }
    .back { font: 0.8rem var(--mono); text-transform: uppercase; letter-spacing: 0.08em; }
    .frame.big { inline-size: 100%; margin-block: 1rem; }
    .project-body { display: grid; gap: 1.25rem; max-inline-size: 46rem; font-size: calc(var(--step-0) * 1.08); }
  }
  .highlights { inline-size: 100%; padding-top: 2rem; border-top: 2px solid var(--fg); margin-top: 1rem; display: grid; gap: 1.5rem;
    h2 { font-size: 1.75rem; }
    dl { display: grid; gap: 1.5rem 3rem; @media (min-width: 52rem) { grid-template-columns: 1fr 1fr; } }
    dt { font: 0.8rem var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--accent); margin-bottom: 0.4rem; }
    dd { color: var(--muted); max-inline-size: 48ch; } }
  .related { display: grid; gap: 1.5rem; inline-size: 100%; padding-top: 2rem; border-top: 2px solid var(--fg); margin-top: 1rem;
    h2 { font-size: 1.75rem; } }
  .related-item { display: grid; gap: 0.6rem; max-inline-size: 30rem; text-decoration: none; span { color: var(--muted); font-size: 0.92rem; }
    .frame { box-shadow: 6px 6px 0 var(--fg); } &:hover .frame { translate: 0 -4px; box-shadow: 8px 8px 0 var(--accent); } strong { font: 600 1.15rem var(--serif); } }

  .about { display: grid; gap: 1.25rem; max-inline-size: 48rem; padding-top: 2rem;
    h1 { font-size: var(--step-5); line-height: 0.95; }
    h2 { margin-top: 1.5rem; font-size: 2rem; }
    .portrait { inline-size: 100%; block-size: auto; aspect-ratio: 3 / 2; object-fit: cover; object-position: 60% 40%; border: 2px solid var(--fg); border-radius: var(--radius); box-shadow: 8px 8px 0 var(--accent); margin-block: 0.75rem 1rem; }
    ul { padding-inline-start: 1.2rem; display: grid; gap: 0.5rem; }
    li::marker { color: var(--accent); }
  }

  .case-link { display: grid; grid-template-columns: 1fr auto; gap: 0.2rem 1rem; align-items: center; inline-size: 100%; padding: 1.25rem 1.5rem; border: 2px solid var(--fg); border-radius: var(--radius); background: var(--surface); text-decoration: none; box-shadow: 6px 6px 0 var(--accent); transition: translate 0.15s, box-shadow 0.15s;
    strong { font: 600 1.4rem var(--serif); grid-column: 1; } .eyebrow { grid-column: 1; color: var(--accent); } span[aria-hidden] { grid-row: 1 / 3; grid-column: 2; font-size: 1.6rem; }
    &:hover { translate: -2px -2px; box-shadow: 8px 8px 0 var(--accent); } }

  .case { display: grid; gap: 1.25rem; max-inline-size: 48rem; padding-top: 2rem; justify-items: start;
    h1 { font-size: var(--step-5); line-height: 0.95; } h2 { margin-top: 2rem; font-size: 2rem; padding-top: 1rem; border-top: 2px solid var(--fg); inline-size: 100%; }
    .back { font: 0.8rem var(--mono); text-transform: uppercase; letter-spacing: 0.08em; }
    .facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); gap: 1px; inline-size: 100%; border: 2px solid var(--fg); background: var(--fg); margin-block: 1rem 0.5rem;
      div { background: var(--surface); padding: 1rem; } dt { font: 600 2rem var(--serif); color: var(--accent); } dd { font: 0.75rem var(--mono); text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); } }
    .stack { font-size: 0.95rem; color: var(--muted); strong { color: var(--fg); } }
    .flow { list-style: none; padding: 0; display: grid; gap: 1rem; counter-reset: step;
      li { counter-increment: step; position: relative; padding-inline-start: 3rem; } li::before { content: counter(step, decimal-leading-zero); position: absolute; inset-inline-start: 0; font: 0.85rem var(--mono); color: var(--accent); padding-top: 0.25rem; } }
    .decisions { display: grid; gap: 1.5rem; dt { font: 600 1.25rem var(--serif); margin-bottom: 0.3rem; } dd { color: var(--muted); } }
    ul:not(.flow) { padding-inline-start: 1.2rem; display: grid; gap: 0.6rem; } li::marker { color: var(--accent); }
  }

  .contact { display: grid; gap: 0.5rem; justify-items: start; padding-top: 1rem; border-top: 2px solid var(--fg);
    h2 { font-size: var(--step-5); line-height: 0.95; margin-block: 1.5rem 0.75rem; } }

  form { display: grid; gap: 1.25rem; max-inline-size: 36rem; margin-top: 1.5rem; justify-items: start; inline-size: 100%;
    label { display: grid; gap: 0.3rem; inline-size: 100%; font: 0.75rem var(--mono); text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
    input, textarea { padding: 0.7rem 0.1rem; border: 0; border-bottom: 2px solid var(--fg); border-radius: 0; background: transparent; font: var(--step-0) var(--font); text-transform: none; letter-spacing: 0; color: var(--fg); transition: border-color 0.15s, background 0.15s;
      &:focus { outline: none; border-color: var(--accent); background: var(--surface); } }
    textarea { resize: vertical; field-sizing: content; min-block-size: 7rem; }
    .hp { position: absolute; inset-inline-start: -9999px; }
  }
  .notice { font-size: 0.95rem; &.ok { color: var(--ok); } &.err { color: var(--err); } }

  .admin { display: grid; gap: 1rem; max-inline-size: 48rem; padding-top: 2rem; h1 { font-size: var(--step-2); } }
  .messages { list-style: none; padding: 0; display: grid; gap: 1rem;
    li { padding: 1rem 1.25rem; border: 2px solid var(--fg); border-radius: var(--radius); background: var(--surface); }
    .meta { font: 0.8rem var(--mono); color: var(--muted); }
    .body { white-space: pre-wrap; overflow-wrap: anywhere; margin-top: 0.5rem; } }
}

@layer motion {
  @media (prefers-reduced-motion: no-preference) {
    /* The flight trace draws itself on load: thermal climbs, then the glide home. */
    .trace path { animation: draw 4.5s cubic-bezier(.45,.05,.3,1) 0.3s backwards; }
    .trace circle { animation: pop 0.4s 4.7s backwards; }
    .hero > :not(.trace) { animation: rise 0.8s cubic-bezier(.2,.7,.2,1) backwards; }
    .hero > :nth-child(3) { animation-delay: 0.08s; } .hero > :nth-child(4) { animation-delay: 0.16s; } .hero > :nth-child(5) { animation-delay: 0.24s; }

    .ticker { span { animation: ticker 38s linear infinite; } &:hover span { animation-play-state: paused; } }

    @supports (animation-timeline: view()) {
      .card .frame { animation: parallax linear both; animation-timeline: view(); }
      .card .card-text, .contact > *, .about > *, .project > * { animation: rise linear both; animation-timeline: view(); animation-range: entry 0% entry 35%; }
    }
  }
  @keyframes draw { from { stroke-dashoffset: 1; } }
  @keyframes pop { from { scale: 0; } }
  @keyframes rise { from { opacity: 0; translate: 0 2rem; } }
  @keyframes ticker { to { translate: -100%; } }
  @keyframes parallax { from { transform: translateY(3rem); } to { transform: translateY(-2rem); } }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
}

@layer layout {
  @media (max-width: 40rem) {
    .site-header { grid-template-columns: 1fr auto; .altimeter { display: none; } nav { gap: 1rem; } }
  }
}