weid.css

/*! weid v0.1 — the visible layer of authorship disclosure · MIT
 *
 *  Base rule: in a document declared as AI-assisted, anything NOT marked was
 *  written by the AI. The marks point at the human, because the human part is
 *  the scarce thing — and the thing worth being able to audit.
 *
 *  Usage: <link rel="stylesheet" href="weid.css">  and nothing else.
 *  No build, no JavaScript, no dependencies.
 */

:root {
  --weid-accent: #0f766e;                 /* human marks */
  --weid-note-color: #78716c;             /* AI-contribution notes */
  --weid-border: rgb(214 211 209 / 0.6);
  --weid-note-width: 172px;
  --weid-note-gap: 28px;
}

/* Dark by system preference. `:not(.light)` lets a site that forces a light
   theme opt out by adding class="light" to <html>. */
@media (prefers-color-scheme: dark) {
  :root:not(.light) {
    --weid-accent: #5eead4;
    --weid-note-color: #a8a29e;
    --weid-border: rgb(68 64 60 / 0.6);
  }
}

/* Dark by class (Tailwind, Astro, themes using data-theme). */
:root.dark,
:root[data-theme="dark"] {
  --weid-accent: #5eead4;
  --weid-note-color: #a8a29e;
  --weid-border: rgb(68 64 60 / 0.6);
}

/* ── 1. Human marks ────────────────────────────────────────────────
   Distinguished by line style, not colour: legible to readers who do not
   distinguish colours, and they survive monochrome printing. */

.weid-verbatim,
.weid-idea,
.weid-experience {
  text-decoration-line: underline;
  text-decoration-color: var(--weid-accent);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
}

.weid-verbatim   { text-decoration-style: solid; }
.weid-idea       { text-decoration-style: dashed; }
.weid-experience { text-decoration-style: dotted; }

/* ── 2. AI-contribution notes ──────────────────────────────────────
   They live inside the paragraph they annotate. Strip the CSS and they are
   still there and still honest: disclosure does not depend on a stylesheet. */

.weid-note {
  display: block;
  margin: 0.75rem 0;
  padding-left: 0.85rem;
  border-left: 2px solid var(--weid-border);
  color: var(--weid-note-color);
  font-size: 0.8rem;
  line-height: 1.45;
  font-style: normal;
  text-align: left;
}

.weid-note::before {
  content: "◦ ";
  color: var(--weid-accent);
}

/* Inside the legend, a note is a sample of itself, not a note: it stays in
   its bullet instead of floating off to the margin. */
.weid-legend .weid-note {
  display: inline;
  float: none;
  width: auto;
  margin: 0;
  padding: 0;
  border: 0;
  font-size: inherit;
  color: var(--weid-note-color);
}

/* To the margin when there is room. Below 1100px it returns to the flow. */
@media (min-width: 1100px) {
  .weid-note {
    float: right;
    clear: right;
    width: var(--weid-note-width);
    margin: 0.25rem 0 0.75rem 0;
    margin-right: calc(-1 * (var(--weid-note-width) + var(--weid-note-gap)));
    padding-left: 0;
    border-left: 0;
  }

  /* Escape hatch for narrow layouts or ones with overflow: hidden. */
  .weid-notes-inline .weid-note {
    float: none;
    width: auto;
    margin: 0.75rem 0;
    padding-left: 0.85rem;
    border-left: 2px solid var(--weid-border);
  }
}

@media print {
  .weid-note {
    float: none;
    width: auto;
    margin: 0.5rem 0;
    padding-left: 0.85rem;
    border-left: 2px solid var(--weid-border);
  }
}

/* ── 3. Legend ─────────────────────────────────────────────────────
   Mandatory: without it the marks are decoration, not disclosure. */

.weid-legend {
  font-size: 0.85rem;
  line-height: 1.5;
  border: 1px solid var(--weid-border);
  border-radius: 0.5rem;
  padding: 0.85rem 1rem;
  margin-bottom: 2rem;
}

.weid-legend ul {
  margin: 0.5rem 0 0;
  padding-left: 1.1rem;
}

.weid-legend li { margin: 0.15rem 0; }

/* The credit, optional: a link back to the convention at the foot of the
   legend. The name wears the verbatim mark — weid signing with its own
   underline. */

.weid-credit {
  display: block;
  margin-top: 0.8rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--weid-border);
  text-align: right;
  font-size: 0.75rem;
  color: var(--weid-note-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

.weid-credit b {
  font-weight: 500;
  color: var(--weid-accent);
  text-decoration-line: underline;
  text-decoration-style: solid;
  text-decoration-color: var(--weid-accent);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
}

.weid-credit:hover { color: var(--weid-accent); }

/* ── 4. Voice pill ─────────────────────────────────────────────────
   The visible counterpart of data-weid-voice. It goes above the legend,
   because it is the first thing a reader wants to know: whose voice is
   this? */

.weid-voice {
  /* flex + fit-content, not inline-flex: the pill takes a line of its own
     without needing an extra wrapper around it. */
  display: flex;
  width: fit-content;
  align-items: baseline;
  margin: 0 0 0.7rem;
  padding: 0.15rem 0.65rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  color: var(--weid-accent);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.7;
}

/* No opacity here: it would mix the colour into the background and drop the
   contrast to 3.4:1. The lighter weight already sets the source apart. */
.weid-voice-src {
  font-weight: 400;
}

.weid-voice-src::before {
  content: "·";
  margin: 0 0.4rem;
  opacity: 0.6;
}

/* A third party's voice looks different on purpose: it is the case this
   convention exists to expose, not one more entry in a list. */
.weid-voice--third-party { color: #b45309; }

@media (prefers-color-scheme: dark) {
  :root:not(.light) .weid-voice--third-party { color: #fbbf24; }
}
:root.dark .weid-voice--third-party,
:root[data-theme="dark"] .weid-voice--third-party { color: #fbbf24; }

/* ── 5. Toggle, without JavaScript ─────────────────────────────────
   A checkbox and :has(). The state lives in the DOM, not in a script. */

.weid-toggle {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.weid-toggle-label {
  float: right;
  margin-left: 1rem;
  padding: 0.15rem 0.6rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  color: var(--weid-accent);
  font-size: 0.75rem;
  white-space: nowrap;
  cursor: pointer;
}

/* Both markups: the checkbox inside the label, or beside it with `for=`
   (the only option where the editor will not let you nest). */
.weid-toggle-label:has(.weid-toggle:focus-visible),
.weid-toggle:focus-visible + .weid-toggle-label {
  outline: 2px solid var(--weid-accent);
  outline-offset: 2px;
}

.weid-lbl-off { display: none; }

/* Anchored to the element that carries the disclosure — the same root §3 makes
   mandatory, so this works whether the work is an <article> or the whole
   <body>. A bare `:has()` would also match `html` and `body`, and on a page
   with two posts one toggle would silently unmark the other. */

:is([data-ai-disclosure], [ai-disclosure]):has(.weid-toggle:checked)
  :is(.weid-verbatim, .weid-idea, .weid-experience) {
  text-decoration-line: none;
}

:is([data-ai-disclosure], [ai-disclosure]):has(.weid-toggle:checked)
  .weid-note { display: none; }

/* ...except the legend's sample, which is the label of its own bullet, not a
   note. Without this the bullet loses its label and starts with a stray ":". */
:is([data-ai-disclosure], [ai-disclosure]):has(.weid-toggle:checked)
  .weid-legend .weid-note { display: inline; }

:is([data-ai-disclosure], [ai-disclosure]):has(.weid-toggle:checked)
  .weid-lbl-on  { display: none; }
:is([data-ai-disclosure], [ai-disclosure]):has(.weid-toggle:checked)
  .weid-lbl-off { display: inline; }

/* The legend is not dimmed while the marks are off: at the opacity that read
   as "inactive" it fell to 2.9:1, and the label already says which state it is
   in. */