/* ---------- Fonts ---------- */
@import url("https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=JetBrains+Mono:wght@400;500&display=swap");
@import url("https://api.fontshare.com/v2/css?f[]=switzer@400,500&display=swap");

/* ---------- Tokens ---------- */
:root {
  --paper: #EFE8D9;
  --ink:   #1B1815;
  --muted: #6B6157;
  --accent:#8E2C24;
  --flash: #C46A3F;
  --rule:  #CFC4AE;
  --tint:  #DED5C2;

  --font-display: "Instrument Serif", Georgia, serif;
  --font-body:    "Switzer", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --page-max: 1080px;
  --page-pad: 40px;

  --measure: 60ch;

  /* Portrait tile: 250px wide, arch-shaped. */
  --portrait-w: 250px;
  --portrait-ratio: 300 / 408;

  /* One period of the wiggle, in px. Animating by exactly this tiles seamlessly. */
  --wiggle-period: 16px;

  /* Time to travel one period. Perceived speed is period ÷ duration, so any
     element with a different period must scale this to match — otherwise a
     shorter wave crawls. 16px / 620ms ≈ 25.8px per second. */
  --wiggle-duration: 620ms;
}

:root[data-theme="dark"] {
  --paper: #17140F;
  --ink:   #EAE3D4;
  --muted: #9C9184;
  --accent:#D9756A;
  --flash: #E5A26B;
  --rule:  #33291E;
  --tint:  #211C15;
}

/* ---------- Base ---------- */
* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }

p { margin: 0 0 26px; max-width: var(--measure); }
p + p { margin-top: 0; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 30px;
}

h1 { font-size: clamp(30px, 3.6vw, 38px); }
h2 { font-size: 23px; letter-spacing: 0; font-family: var(--font-body); font-weight: 500; }
h3 { font-size: 20px; letter-spacing: 0; font-family: var(--font-body); font-weight: 500; margin-bottom: 18px; }

.meta {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 10.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}

/* Hidden from sight, kept in the accessibility tree so screen readers still
   announce it. display:none or visibility:hidden would remove it from both,
   which defeats the purpose. */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- Links: The Outline-style travelling wiggle ----------
   The squiggle is a mask over currentColor rather than a background image,
   so it inherits the link's colour and needs no per-theme variant. Hover
   scrolls the mask by exactly one period, which loops seamlessly. */
a {
  color: inherit;
  text-decoration: none;
  position: relative;
}

a:not(.wordmark)::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.32em;
  height: 6px;
  background-color: currentColor;
  -webkit-mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 6'><path d='M0 3 Q 4 0.5 8 3 T 16 3' fill='none' stroke='black' stroke-width='1.4' stroke-linecap='round'/></svg>");
  mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 6'><path d='M0 3 Q 4 0.5 8 3 T 16 3' fill='none' stroke='black' stroke-width='1.4' stroke-linecap='round'/></svg>");
  -webkit-mask-repeat: repeat-x;
  mask-repeat: repeat-x;
  -webkit-mask-size: var(--wiggle-period) 6px;
  mask-size: var(--wiggle-period) 6px;
  -webkit-mask-position: 0 50%;
  mask-position: 0 50%;
  opacity: 0;
  transition: opacity 130ms ease;
  pointer-events: none;

  /* Declared here and merely paused, rather than added on :hover. Adding it
     on hover means removing it on unhover, which snaps mask-position back to
     0 mid-fade — a visible jerk whenever the pointer leaves partway through a
     cycle. Pausing holds the wave where it stopped. A paused animation costs
     nothing, and since the tile repeats seamlessly, any resting phase looks
     identical. */
  animation: wiggle-run var(--wiggle-duration) linear infinite;
  animation-play-state: paused;
}

a:not(.wordmark):hover::after,
a:not(.wordmark):focus-visible::after {
  opacity: 1;
  animation-play-state: running;
}

a:not(.wordmark):hover,
a:not(.wordmark):focus-visible { color: var(--accent); }

/* Links in prose sit in --accent so they can be spotted without hovering;
   the squiggle stays a hover-only flourish. The nav is exempt — it already
   reads as navigation from its position and mono type. */
main a:not(.wordmark) { color: var(--accent); }

@keyframes wiggle-run {
  from { -webkit-mask-position: 0 50%;                  mask-position: 0 50%; }
  to   { -webkit-mask-position: var(--wiggle-period) 50%; mask-position: var(--wiggle-period) 50%; }
}

@media (prefers-reduced-motion: reduce) {
  a:not(.wordmark)::after,
  .wordmark::after { animation: none; }
}

/* ---------- Layout ---------- */
.page {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: var(--page-pad);
}

/* ---------- Masthead ----------
   Wordmark sits left; the toggle and nav stack right-aligned beside it. */
.masthead {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 44px;
}

.wordmark {
  font-family: var(--font-display);

  /* Sized so the wordmark measures the same width as the portrait below it,
     giving both a flush right edge. "Dan Rob Jones" in Instrument Serif at
     -0.02em renders ~4.588px wide per 1px of font-size, so the divisor is
     specific to this name and this typeface — re-measure if either changes.
     Fixed rather than fluid because the rest of the desktop layout is fixed:
     a vw-based size drifts out of alignment as the window narrows. */
  font-size: calc(var(--portrait-w) / 4.588);

  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--ink);
  display: inline-block;
  padding-bottom: 14px;
  flex: none;

  /* The wordmark's squiggle tiles at 13px rather than the default 16px, so
     scope the period here — the shared keyframes read it per-element and
     will travel exactly one tile, keeping the loop seamless. The duration is
     scaled by the same 13/16 ratio (620ms × 0.8125) so the wave travels at
     the same px-per-second as the links rather than looking sluggish. */
  --wiggle-period: 13px;
  --wiggle-duration: 504ms;
}

/* Permanent wavy rule under the wordmark, in --flash. It sits at rest and
   starts travelling on hover. */
.wordmark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 7px;
  background-color: var(--flash);
  -webkit-mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 6'><path d='M0 3 Q 4 0.5 8 3 T 16 3' fill='none' stroke='black' stroke-width='1.5' stroke-linecap='round'/></svg>");
  mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 6'><path d='M0 3 Q 4 0.5 8 3 T 16 3' fill='none' stroke='black' stroke-width='1.5' stroke-linecap='round'/></svg>");
  -webkit-mask-repeat: repeat-x;
  mask-repeat: repeat-x;
  -webkit-mask-size: var(--wiggle-period) 7px;
  mask-size: var(--wiggle-period) 7px;
  -webkit-mask-position: 0 50%;
  mask-position: 0 50%;

  /* Paused at rest for the same reason as the links above: this squiggle is
     permanently visible, so a snap back to phase 0 on unhover would be even
     more obvious than it is on a fading one. */
  animation: wiggle-run var(--wiggle-duration) linear infinite;
  animation-play-state: paused;
}

.wordmark:hover::after,
.wordmark:focus-visible::after {
  animation-play-state: running;
}

.masthead-controls {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 22px;
  padding-top: 4px;
}

.nav {
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav a {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}
.nav a[aria-current="page"] { color: var(--accent); }

/* ---------- Theme toggle (pill switch) ---------- */
.theme-toggle {
  width: 34px;
  height: 18px;
  flex: none;
  padding: 0;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--tint);
  cursor: pointer;
  position: relative;
  transition: background-color 160ms ease, border-color 160ms ease;
}
.theme-toggle:hover { border-color: var(--accent); }

.theme-toggle__knob {
  position: absolute;
  top: 50%;
  left: 2px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--muted);
  transform: translate(0, -50%);
  transition: transform 180ms ease, background-color 180ms ease;
}
:root[data-theme="dark"] .theme-toggle__knob {
  transform: translate(16px, -50%);
  background: var(--accent);
}

@media (prefers-reduced-motion: reduce) {
  .theme-toggle__knob { transition: none; }
}

/* ---------- Homepage ---------- */
.home-grid {
  display: grid;
  grid-template-columns: var(--portrait-w) 58ch;
  gap: 56px;
  align-items: start;
}

.home-grid .text { padding-left: 28px; }

.home-grid h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4.5vw, 3.1rem);
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-bottom: 30px;
}

.home-grid p {
  font-size: 17.5px;
  line-height: 1.65;
  margin-bottom: 26px;
}
.home-grid p:nth-of-type(2) { margin-bottom: 18px; }

/* Arch: elliptical dome on top, near-square base. */
.portrait {
  width: 100%;
  aspect-ratio: var(--portrait-ratio);
  object-fit: cover;
  background: var(--tint);
  border-radius: 50% 50% 6px 6px / 30% 30% 6px 6px;
}

/* ---------- Wavy rule ---------- */
hr.wavy {
  border: 0;
  width: 120px;
  height: 10px;
  margin: 3rem 0;
  background-color: var(--muted);
  -webkit-mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 10' preserveAspectRatio='none'><path d='M0 5 Q 15 0 30 5 T 60 5 T 90 5 T 120 5' fill='none' stroke='black' stroke-width='1.25'/></svg>");
  mask-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 10' preserveAspectRatio='none'><path d='M0 5 Q 15 0 30 5 T 60 5 T 90 5 T 120 5' fill='none' stroke='black' stroke-width='1.25'/></svg>");
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
}

/* ---------- Reading list ---------- */
.reading-list { list-style: none; padding: 0; margin: 0; }

.reading-entry { margin-bottom: 42px; }
.reading-entry:last-child { margin-bottom: 0; }

.reading-entry .title {
  font-family: var(--font-display);
  font-size: 27px;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 6px;
}

.reading-entry .byline {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--muted);
  margin: 0 0 8px;
}

.reading-entry .note {
  font-size: 14.5px;
  line-height: 1.6;
  max-width: var(--measure);
  margin: 0;
}

/* ---------- Resources ---------- */
.resource-group { margin-bottom: 56px; }
.resource-group:last-child { margin-bottom: 0; }

.resource-group h2 {
  font-family: var(--font-body);
  font-size: 23px;
  font-weight: 500;
  margin-bottom: 20px;
}

.resource-list { list-style: none; padding: 0; margin: 0; }
.resource-list li { margin-bottom: 14px; font-size: 14.5px; line-height: 1.6; }

/* ---------- Secondary body ---------- */
.small { font-size: 14.5px; line-height: 1.6; color: var(--muted); }

/* ---------- Footer ---------- */
.site-footer {
  margin-top: 64px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}

.colophon { margin: 0; max-width: none; }

/* ---------- Responsive ---------- */
@media (max-width: 800px) {
  .page { padding: 28px 22px; }

  /* Stacked layout — the nav sits between the wordmark and the portrait, so
     the edge relationship is much weaker. Keep the smaller spec size. */
  .wordmark { font-size: 34px; }

  .masthead {
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
  }

  /* Dissolve the controls wrapper so the toggle and nav become direct flex
     items of the masthead: wordmark + toggle share the top row, and the nav
     drops to its own full-width row instead of being crushed into the
     leftover space and wrapping onto five lines. */
  .masthead-controls { display: contents; }
  .theme-toggle { order: 2; margin-left: auto; }
  .nav {
    order: 3;
    flex: 0 0 100%;
    justify-content: flex-start;
    gap: 18px;
  }

  .home-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .home-grid .text { padding-left: 0; }
  .portrait { max-width: var(--portrait-w); }
}