/*
 * A tool that flags indigo gradients, Inter and three rounded cards would look
 * ridiculous wearing them. So: warm paper, one accent, a serif for reading and
 * a monospace for the machinery. Corners are square unless there is a reason.
 */

:root {
  --paper:    #f6f2e9;
  --paper-2:  #fffdf8;
  --paper-3:  #efe9db;
  --ink:      #17140f;
  --ink-2:    #55503f;
  /* Darkened from #7d7666, which measured 3.8:1 on the paper ground and so
     failed WCAG AA for the hint text and metadata rows that use it. */
  --ink-3:    #6b6456;
  --rule:     #ded5c2;
  --rule-2:   #c9bfa8;
  --red:      #b8402e;
  --red-soft: #f3e2dd;
  --green:    #3f6b4a;
  --amber:    #9a6b12;
  --shadow:   rgba(23, 20, 15, .09);

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --measure: 34rem;
  --gutter: clamp(1.25rem, 4vw, 3rem);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:    #14120e;
    --paper-2:  #1d1a14;
    --paper-3:  #24201a;
    --ink:      #f2ede1;
    --ink-2:    #b3ab99;
    --ink-3:    #8b8474;
    --rule:     #353026;
    --rule-2:   #4a4436;
    --red:      #e2705a;
    --red-soft: #33211c;
    --green:    #7fb08c;
    --amber:    #d3a253;
    --shadow:   rgba(0, 0, 0, .5);
  }
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration-color: var(--rule-2); text-underline-offset: .18em; }
a:hover { text-decoration-color: var(--red); }

h1, h2, h3 { line-height: 1.18; font-weight: 600; margin: 0; letter-spacing: -.012em; }

::selection { background: var(--red); color: var(--paper-2); }

:where(a, button, input, textarea, summary):focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

/* ---------------------------------------------------------------- structure */

.shell {
  max-width: 62rem;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.rule { border: 0; border-top: 1px solid var(--rule); margin: 0; }

.eyebrow {
  font-family: var(--mono);
  font-size: .6875rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 .75rem;
}

/* ------------------------------------------------------------------- header */

.masthead {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 0;
  border-bottom: 1px solid var(--rule);
  flex-wrap: wrap;
}

.brand { display: flex; align-items: center; gap: .7rem; text-decoration: none; }
.brand svg { display: block; width: 34px; height: 34px; flex: none; }

.brand-name {
  font-family: var(--mono);
  font-size: .8125rem;
  letter-spacing: .17em;
  text-transform: uppercase;
  font-weight: 600;
}
.brand-tag {
  display: block;
  font-family: var(--serif);
  font-size: .8125rem;
  letter-spacing: 0;
  text-transform: none;
  font-weight: 400;
  font-style: italic;
  color: var(--ink-3);
}

.masthead nav {
  margin-left: auto;
  display: flex;
  gap: 1.35rem;
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .06em;
}
.masthead nav a { text-decoration: none; color: var(--ink-2); }
.masthead nav a:hover { color: var(--red); }

/* --------------------------------------------------------------------- hero */

.hero { padding: clamp(2.5rem, 7vw, 4.5rem) 0 2rem; }

.hero h1 {
  font-size: clamp(2rem, 5.5vw, 3.25rem);
  max-width: 20ch;
  margin-bottom: 1.1rem;
}

.hero p {
  max-width: var(--measure);
  color: var(--ink-2);
  font-size: 1.125rem;
  margin: 0 0 1rem;
}

.hero .disclaimer {
  font-size: .9375rem;
  border-left: 2px solid var(--red);
  padding-left: .9rem;
  color: var(--ink-2);
}

/* ------------------------------------------------------------------- panels */

.panel {
  background: var(--paper-2);
  border: 1px solid var(--rule);
  box-shadow: 0 1px 0 var(--shadow);
}

.tabs {
  display: flex;
  border-bottom: 1px solid var(--rule);
  background: var(--paper-3);
}

.tab {
  appearance: none;
  border: 0;
  border-right: 1px solid var(--rule);
  background: transparent;
  padding: .85rem 1.25rem;
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
  cursor: pointer;
}
.tab[aria-selected="true"] {
  background: var(--paper-2);
  color: var(--ink);
  box-shadow: inset 0 2px 0 var(--red);
}
.tab:hover { color: var(--ink); }

.tabpanel { padding: 1.5rem; }
.tabpanel[hidden] { display: none; }

label.field {
  display: block;
  font-family: var(--mono);
  font-size: .6875rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: .55rem;
}

input[type="url"], input[type="text"], textarea {
  width: 100%;
  background: var(--paper);
  border: 1px solid var(--rule-2);
  color: var(--ink);
  font-family: var(--mono);
  font-size: .875rem;
  line-height: 1.5;
  padding: .7rem .8rem;
  border-radius: 2px;
}
textarea { min-height: 15rem; resize: vertical; white-space: pre; overflow-wrap: normal; overflow-x: auto; }
input:focus, textarea:focus { border-color: var(--red); outline: none; }

.actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.btn {
  appearance: none;
  background: var(--ink);
  color: var(--paper-2);
  border: 1px solid var(--ink);
  padding: .7rem 1.4rem;
  font-family: var(--mono);
  font-size: .75rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  cursor: pointer;
  border-radius: 2px;
  text-decoration: none;
  display: inline-block;
}
.btn:hover { background: var(--red); border-color: var(--red); }
.btn[disabled] { opacity: .5; cursor: progress; }

.btn-quiet {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule-2);
}
.btn-quiet:hover { background: transparent; border-color: var(--red); color: var(--red); }

label.check {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: .6rem;
  align-items: start;
  margin-top: .9rem;
  padding: .75rem .85rem;
  background: var(--paper-3);
  border-left: 2px solid var(--rule-2);
  cursor: pointer;
  font-size: .875rem;
  color: var(--ink-2);
  line-height: 1.5;
}
label.check:hover { border-left-color: var(--red); }
label.check input { margin: .2rem 0 0; accent-color: var(--red); }
label.check strong { color: var(--ink); font-weight: 600; }

.hint { font-size: .875rem; color: var(--ink-3); margin: .6rem 0 0; }
.hint-top { margin: 0 0 .5rem; }

.command {
  margin: 0 0 .75rem;
  padding: .7rem .8rem;
  background: var(--ink);
  color: var(--paper-2);
  border-radius: 2px;
  overflow-x: auto;
  cursor: text;
}
.command code {
  font-family: var(--mono);
  font-size: .8125rem;
  white-space: pre;
  background: none;
  padding: 0;
  color: inherit;
}
@media (prefers-color-scheme: dark) {
  .command { background: var(--paper-3); color: var(--ink); border: 1px solid var(--rule); }
}

label.field code {
  font-family: var(--mono);
  font-size: .95em;
  text-transform: none;
  letter-spacing: 0;
}

/* -------------------------------------------------------------------- error */

.error {
  margin-top: 1rem;
  padding: .8rem 1rem;
  background: var(--red-soft);
  border-left: 3px solid var(--red);
  font-size: .9375rem;
}

/* ------------------------------------------------------------------ results */

#results { margin-top: 2.5rem; scroll-margin-top: 1rem; }
#results[hidden] { display: none; }

.verdict {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  gap: clamp(1rem, 4vw, 2.5rem);
  align-items: start;
  padding: clamp(1.25rem, 4vw, 2rem);
  border-bottom: 1px solid var(--rule);
}

.score {
  font-family: var(--mono);
  font-size: clamp(3.5rem, 12vw, 5.5rem);
  line-height: .9;
  font-weight: 700;
  letter-spacing: -.04em;
  font-variant-numeric: tabular-nums;
}
.score span { font-size: .38em; letter-spacing: 0; }

.score.is-ai      { color: var(--red); }
.score.is-mixed   { color: var(--amber); }
.score.is-human   { color: var(--green); }
.score.is-unknown { color: var(--ink-3); }

.verdict h2 { font-size: clamp(1.25rem, 3.5vw, 1.75rem); margin-bottom: .5rem; }
.verdict p { margin: 0 0 .75rem; color: var(--ink-2); max-width: 46ch; }

.meta-row {
  font-family: var(--mono);
  font-size: .75rem;
  color: var(--ink-3);
  display: flex;
  gap: 1.25rem;
  flex-wrap: wrap;
  margin-top: .35rem;
}

.subject {
  font-family: var(--mono);
  font-size: .8125rem;
  padding: .75rem clamp(1.25rem, 4vw, 2rem);
  background: var(--paper-3);
  border-bottom: 1px solid var(--rule);
  overflow-wrap: anywhere;
  color: var(--ink-2);
}

.meter {
  position: relative;
  height: 10px;
  background: var(--paper-3);
  border-bottom: 1px solid var(--rule);
}
.meter-fill { height: 100%; background: var(--ink-3); transition: width .5s cubic-bezier(.2,.7,.3,1); }
.meter-fill.is-ai { background: var(--red); }
.meter-fill.is-mixed { background: var(--amber); }
.meter-fill.is-human { background: var(--green); }
.meter-scale {
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: .625rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
  padding: .5rem clamp(1.25rem, 4vw, 2rem);
  border-bottom: 1px solid var(--rule);
}

/* evidence */

.evidence { padding: clamp(1.25rem, 4vw, 2rem); }
.evidence > h3 { font-size: 1rem; margin-bottom: 1rem; }

.signal {
  border-top: 1px solid var(--rule);
  padding: .9rem 0;
}
.signal:last-child { border-bottom: 1px solid var(--rule); }

.signal summary {
  cursor: pointer;
  list-style: none;
  display: grid;
  grid-template-columns: 1.25rem minmax(0, 1fr) auto;
  gap: .6rem;
  align-items: baseline;
}
.signal summary::-webkit-details-marker { display: none; }
.signal summary::before {
  content: "+";
  font-family: var(--mono);
  color: var(--ink-3);
  font-size: .875rem;
}
.signal[open] summary::before { content: "\2212"; }

.signal-label { font-size: 1rem; }
.signal-tags {
  font-family: var(--mono);
  font-size: .625rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
}
.signal-tags .strength { color: var(--red); }
.signal.is-human .signal-tags .strength { color: var(--green); }

.signal-body {
  padding: .75rem 0 .25rem 1.85rem;
  max-width: 60ch;
}
.signal-body p { margin: 0 0 .6rem; color: var(--ink-2); font-size: .9375rem; }

.excerpts { margin: 0; padding: 0; list-style: none; }
.excerpts li {
  font-family: var(--mono);
  font-size: .75rem;
  background: var(--paper-3);
  border-left: 2px solid var(--rule-2);
  padding: .4rem .6rem;
  margin-bottom: .35rem;
  overflow-wrap: anywhere;
  color: var(--ink-2);
}

/* per-page breakdown, whole-site mode */

.pages { padding: 0 clamp(1.25rem, 4vw, 2rem) 1.25rem; }
.pages[hidden] { display: none; }
.pages ol { list-style: none; margin: 0; padding: 0; counter-reset: page; }
.pages li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 1rem;
  align-items: baseline;
  padding: .5rem 0;
  border-top: 1px solid var(--rule);
  font-size: .875rem;
}
.pages li:last-child { border-bottom: 1px solid var(--rule); }
.page-path {
  font-family: var(--mono);
  font-size: .8125rem;
  overflow-wrap: anywhere;
  color: var(--ink-2);
}
.page-words {
  font-family: var(--mono);
  font-size: .6875rem;
  color: var(--ink-3);
  white-space: nowrap;
}
.page-score {
  font-family: var(--mono);
  font-size: .8125rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.page-score.is-ai      { color: var(--red); }
.page-score.is-mixed   { color: var(--amber); }
.page-score.is-human   { color: var(--green); }
.page-score.is-unknown { color: var(--ink-3); }

.notes {
  padding: 0 clamp(1.25rem, 4vw, 2rem) clamp(1.25rem, 4vw, 2rem);
}
.notes ul { margin: 0; padding-left: 1.1rem; }
.notes li { font-size: .9375rem; color: var(--ink-2); margin-bottom: .5rem; max-width: 62ch; }

.cert-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.25rem clamp(1.25rem, 4vw, 2rem);
  border-top: 1px solid var(--rule);
  background: var(--paper-3);
}
.cert-bar p { margin: 0; font-size: .875rem; color: var(--ink-2); max-width: 40ch; }

/* --------------------------------------------------------------- long reads */

.prose { max-width: var(--measure); }
.prose h2 { font-size: 1.5rem; margin-bottom: 1rem; }
.prose h3 { font-size: 1.0625rem; margin: 1.75rem 0 .5rem; }
.prose p { color: var(--ink-2); }
.prose ol, .prose ul { color: var(--ink-2); padding-left: 1.15rem; }
.prose li { margin-bottom: .5rem; }
.prose code {
  font-family: var(--mono);
  font-size: .85em;
  background: var(--paper-3);
  padding: .1em .35em;
  border-radius: 2px;
}

section.band { padding: clamp(2.5rem, 6vw, 4rem) 0; border-top: 1px solid var(--rule); }

.ladder { list-style: none; padding: 0; margin: 1.5rem 0 0; counter-reset: rung; }
.ladder li {
  display: grid;
  /* Three children (the counter, the term, the description) across two
     columns, so the term and description must both be pinned to column 2.
     Without that the description auto-places into the 2.5rem counter column
     and wraps one word per line. */
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 0 1rem;
  padding: .85rem 0;
  border-top: 1px solid var(--rule);
  align-items: baseline;
}
.ladder li::before {
  counter-increment: rung;
  content: counter(rung);
  font-family: var(--mono);
  font-size: .75rem;
  color: var(--red);
}
.ladder strong { grid-column: 2; font-weight: 600; }
.ladder span {
  grid-column: 2;
  display: block;
  margin-top: .3rem;
  color: var(--ink-2);
  font-size: .9375rem;
}

/* ------------------------------------------------------------------- footer */

.colophon {
  border-top: 1px solid var(--rule);
  padding: 2.5rem 0 3.5rem;
  font-size: .875rem;
  color: var(--ink-3);
}
.colophon-grid {
  display: flex;
  gap: 2.5rem;
  flex-wrap: wrap;
  justify-content: space-between;
}
.colophon a { color: var(--ink-2); }
.colophon p { margin: 0 0 .5rem; max-width: 34ch; }
.colophon .links { display: flex; flex-direction: column; gap: .4rem; font-family: var(--mono); font-size: .75rem; }

.colophon .studio {
  margin-top: .9rem;
  padding-top: .9rem;
  border-top: 1px solid var(--rule);
  font-family: var(--serif);
  font-style: italic;
  font-size: .875rem;
  color: var(--ink-2);
}

/* -------------------------------------------------------------------- misc */

.spinner {
  font-family: var(--mono);
  font-size: .75rem;
  color: var(--ink-3);
  letter-spacing: .1em;
  text-transform: uppercase;
}

.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;
}

@media (max-width: 34rem) {
  .verdict { grid-template-columns: 1fr; }
  .signal summary { grid-template-columns: 1.25rem minmax(0, 1fr); }
  .signal-tags { grid-column: 2; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}