/* Self-hosted so the page never waits on a third-party font host.
   Latin subset only, 172 KB total. */

@font-face {
  font-family: "Archivo";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/archivo-latin-500-normal.woff2") format("woff2");
}

@font-face {
  font-family: "Archivo";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("../fonts/archivo-latin-700-normal.woff2") format("woff2");
}

@font-face {
  font-family: "Archivo";
  font-style: normal;
  font-weight: 800;
  font-display: swap;
  src: url("../fonts/archivo-latin-800-normal.woff2") format("woff2");
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2");
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/ibm-plex-sans-latin-500-normal.woff2") format("woff2");
}

@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("../fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2");
}

@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2");
}

@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2");
}

@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-latin-600-normal.woff2") format("woff2");
}

:root {
  --paper: #eff0ec;
  --paper-deep: #e2e4dd;
  --card: #ffffff;
  --ink: #0e1a24;
  --ink-soft: #4d5b68;
  --ink-faint: #7b8792;
  --backdrop: #1f4e79;
  --backdrop-lit: #4a86b4;
  --backdrop-deep: #13314c;
  --pass: #1e7a54;
  --fail: #b23a2f;
  --line: #cdd2cb;
  --radius: 3px;
}

* { box-sizing: border-box; }

/* Class-level display rules outrank the UA [hidden] rule, so restate it. */
[hidden] { display: none !important; }

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

body {
  margin: 0;
  background: var(--paper, #eff0ec);
  color: var(--ink, #0e1a24);
  font-family: "IBM Plex Sans", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

main { max-width: 1120px; margin: 0 auto; padding: 0 24px 96px; }

a { color: var(--backdrop, #1f4e79); }

/* ---------- masthead ---------- */

.masthead {
  max-width: 1120px;
  margin: 0 auto;
  padding: 26px 24px 22px;
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.wordmark {
  font-family: "Archivo", sans-serif;
  font-weight: 800;
  font-size: 21px;
  letter-spacing: -0.025em;
  color: var(--ink, #0e1a24);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 9px;
}

.wordmark__mark {
  width: 31px;
  height: 31px;
  object-fit: contain;
  display: block;
}

.masthead__line {
  margin: 0;
  font-size: 14px;
  color: var(--ink-faint, #7b8792);
  border-left: 1px solid var(--line, #cdd2cb);
  padding-left: 18px;
}

.masthead__link {
  margin-left: auto;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1.5px solid var(--backdrop-lit, #4a86b4);
  padding-bottom: 1px;
}

/* ---------- intro ---------- */

.intro { padding: 24px 0 30px; max-width: 660px; }

.intro h1 {
  font-family: "Archivo", sans-serif;
  font-weight: 800;
  font-size: clamp(25px, 3.5vw, 35px);
  line-height: 1.14;
  letter-spacing: -0.03em;
  margin: 0 0 14px;
}

.intro p {
  margin: 0;
  font-size: 16px;
  color: var(--ink-soft, #4d5b68);
  max-width: 60ch;
}

/* ---------- bench ---------- */

.bench {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
  gap: 28px;
  align-items: start;
}

/* ---------- studio backdrop ---------- */

.studio__frame {
  position: relative;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius, 3px);
  cursor: pointer;
  overflow: hidden;
  display: grid;
  place-items: center;
  padding: 30px;
  background:
    radial-gradient(120% 95% at 50% 8%,
      var(--backdrop-lit, #4a86b4) 0%,
      var(--backdrop, #1f4e79) 46%,
      var(--backdrop-deep, #13314c) 100%);
  transition: box-shadow 0.18s ease;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.09);
}

.studio__frame:hover,
.studio__frame:focus-visible {
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.28),
              0 0 0 3px rgba(74, 134, 180, 0.35);
  outline: none;
}

.studio__frame.is-dragging {
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.7);
}

/* corner crop marks, like a photo studio proof */
.mark {
  position: absolute;
  width: 20px;
  height: 20px;
  border-color: rgba(255, 255, 255, 0.42);
  border-style: solid;
  border-width: 0;
  pointer-events: none;
}
.mark--tl { top: 14px; left: 14px; border-top-width: 1.5px; border-left-width: 1.5px; }
.mark--tr { top: 14px; right: 14px; border-top-width: 1.5px; border-right-width: 1.5px; }
.mark--bl { bottom: 14px; left: 14px; border-bottom-width: 1.5px; border-left-width: 1.5px; }
.mark--br { bottom: 14px; right: 14px; border-bottom-width: 1.5px; border-right-width: 1.5px; }

.studio__empty { text-align: center; color: rgba(255, 255, 255, 0.9); }

.studio__icon { width: 46px; height: 46px; opacity: 0.75; }

.studio__prompt {
  font-family: "Archivo", sans-serif;
  font-weight: 700;
  font-size: 19px;
  margin: 12px 0 5px;
  letter-spacing: -0.015em;
}

.studio__sub { margin: 0; font-size: 14px; color: rgba(255, 255, 255, 0.62); }

.studio__preview {
  max-width: 100%;
  max-height: 100%;
  min-width: 0;
  min-height: 0;
  object-fit: contain;
  border-radius: 2px;
  box-shadow: 0 14px 34px rgba(8, 24, 40, 0.42);
}

.studio__caption {
  margin: 12px 2px 0;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12.5px;
  color: var(--ink-faint, #7b8792);
}

/* ---------- spec sheet ---------- */

.spec {
  background: var(--card, #ffffff);
  border: 1px solid var(--line, #cdd2cb);
  border-radius: var(--radius, 3px);
  padding: 24px 22px 22px;
}

.field { margin-bottom: 18px; }

.field label,
.field__label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft, #4d5b68);
  margin-bottom: 7px;
}

select {
  width: 100%;
  font: inherit;
  font-size: 15px;
  padding: 10px 12px;
  color: var(--ink, #0e1a24);
  background: var(--paper, #eff0ec);
  border: 1px solid var(--line, #cdd2cb);
  border-radius: var(--radius, 3px);
}

select:focus-visible,
input:focus-visible {
  outline: 2px solid var(--backdrop-lit, #4a86b4);
  outline-offset: 1px;
}

.chips { display: flex; flex-wrap: wrap; gap: 7px; }

.chip {
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  padding: 7px 13px;
  background: var(--paper, #eff0ec);
  color: var(--ink-soft, #4d5b68);
  border: 1px solid var(--line, #cdd2cb);
  border-radius: 100px;
  cursor: pointer;
}

.chip:hover { border-color: var(--backdrop-lit, #4a86b4); color: var(--ink, #0e1a24); }

.chip.is-on {
  background: var(--backdrop, #1f4e79);
  border-color: var(--backdrop, #1f4e79);
  color: #fff;
}

.spec__note {
  margin: 12px 0 20px;
  font-size: 13px;
  color: var(--ink-faint, #7b8792);
  min-height: 20px;
}

.dims { display: grid; gap: 10px; }

.dims__pair { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.num {
  position: relative;
  display: block;
  background: var(--paper, #eff0ec);
  border: 1px solid var(--line, #cdd2cb);
  border-radius: var(--radius, 3px);
  padding: 7px 12px 8px;
}

.num span {
  display: block;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--ink-faint, #7b8792);
  margin-bottom: 1px;
}

.num input {
  width: 100%;
  border: 0;
  background: none;
  font-family: "IBM Plex Mono", monospace;
  font-size: 18px;
  font-weight: 500;
  color: var(--ink, #0e1a24);
  padding: 0 26px 0 0;
  -moz-appearance: textfield;
}

.num input::-webkit-outer-spin-button,
.num input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }

.num em {
  position: absolute;
  right: 12px;
  bottom: 9px;
  font-style: normal;
  font-family: "IBM Plex Mono", monospace;
  font-size: 12.5px;
  color: var(--ink-faint, #7b8792);
}

.more { margin: 18px 0 20px; border-top: 1px solid var(--line, #cdd2cb); padding-top: 14px; }

.more summary {
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--backdrop, #1f4e79);
}

.more__body { padding-top: 16px; }

.check {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  font-size: 14px;
  color: var(--ink-soft, #4d5b68);
  margin-bottom: 12px;
  cursor: pointer;
}

.check input { margin: 3px 0 0; accent-color: var(--backdrop, #1f4e79); }

/* ---------- buttons ---------- */

.go {
  display: block;
  width: 100%;
  font-family: "Archivo", sans-serif;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
  padding: 14px;
  color: #fff;
  background: var(--backdrop, #1f4e79);
  border: 0;
  border-radius: var(--radius, 3px);
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: background 0.15s ease;
}

.go:hover:not(:disabled) { background: var(--backdrop-deep, #13314c); }

.go:disabled { background: var(--paper-deep, #e2e4dd); color: var(--ink-faint, #7b8792); cursor: not-allowed; }

.go--download { background: var(--pass, #1e7a54); }
.go--download:hover { background: #16613f; }

.ghost {
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  padding: 13px 20px;
  background: none;
  color: var(--ink-soft, #4d5b68);
  border: 1px solid var(--line, #cdd2cb);
  border-radius: var(--radius, 3px);
  cursor: pointer;
}

.ghost:hover { border-color: var(--ink-faint, #7b8792); color: var(--ink, #0e1a24); }

.disclaim { margin: 14px 0 0; font-size: 12.5px; color: var(--ink-faint, #7b8792); }

/* ---------- result ---------- */

.result {
  margin-top: 34px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
  gap: 28px;
  align-items: start;
  border-top: 2px solid var(--ink, #0e1a24);
  padding-top: 30px;
}

.result__shot {
  background: var(--card, #ffffff);
  border: 1px solid var(--line, #cdd2cb);
  border-radius: var(--radius, 3px);
  min-height: 200px;
  display: grid;
  place-items: center;
  padding: 40px 34px;
  background: var(--paper-deep, #e2e4dd);
  box-shadow: inset 0 1px 3px rgba(14, 26, 36, 0.08);
}

.result__shot img {
  max-width: 100%;
  box-shadow: 0 4px 22px rgba(14, 26, 36, 0.22);
  animation: develop 0.45s ease-out;
}

@keyframes develop {
  from { opacity: 0; filter: brightness(1.5) contrast(0.4); }
  to { opacity: 1; filter: none; }
}

.result__panel h2 {
  font-family: "Archivo", sans-serif;
  font-weight: 800;
  font-size: 25px;
  letter-spacing: -0.028em;
  margin: 0 0 16px;
}

.checklist { list-style: none; margin: 0 0 22px; padding: 0; }

.checklist li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line, #cdd2cb);
  font-size: 14.5px;
}

.checklist li:first-child { border-top: 1px solid var(--line, #cdd2cb); }

.checklist .tick {
  font-family: "IBM Plex Mono", monospace;
  font-weight: 600;
  color: var(--pass, #1e7a54);
  flex: none;
}

.checklist .tick--no { color: var(--fail, #b23a2f); }

.checklist .val {
  margin-left: auto;
  font-family: "IBM Plex Mono", monospace;
  font-size: 14px;
  color: var(--ink, #0e1a24);
}

.result__actions { display: grid; grid-template-columns: 1fr auto; gap: 10px; }

.result__meta { margin: 16px 0 0; font-size: 13px; color: var(--ink-faint, #7b8792); }

/* ---------- alert ---------- */

.alert {
  margin: 24px 0 0;
  padding: 14px 16px;
  background: #fbeceb;
  border-left: 3px solid var(--fail, #b23a2f);
  color: #7d281f;
  font-size: 14.5px;
  border-radius: 0 var(--radius, 3px) var(--radius, 3px) 0;
}

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

footer {
  border-top: 1px solid var(--line, #cdd2cb);
  padding: 26px 24px 44px;
  max-width: 1120px;
  margin: 0 auto;
  font-size: 13px;
  color: var(--ink-faint, #7b8792);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

footer p { margin: 0; }

/* ---------- guide page ---------- */

.guide { max-width: 760px; padding-top: 30px; }

.guide h1 {
  font-family: "Archivo", sans-serif;
  font-weight: 800;
  font-size: clamp(28px, 4.4vw, 40px);
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin: 0 0 18px;
}

.guide h2 {
  font-family: "Archivo", sans-serif;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.02em;
  margin: 40px 0 12px;
}

.guide p, .guide li { color: var(--ink-soft, #4d5b68); max-width: 66ch; }

.sizes { width: 100%; border-collapse: collapse; margin: 22px 0; font-size: 14.5px; }

.sizes th {
  text-align: left;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-faint, #7b8792);
  border-bottom: 1.5px solid var(--ink, #0e1a24);
  padding: 0 10px 8px 0;
}

.sizes td { padding: 10px 10px 10px 0; border-bottom: 1px solid var(--line, #cdd2cb); }

.sizes td.n { font-family: "IBM Plex Mono", monospace; white-space: nowrap; }

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .bench, .result { grid-template-columns: 1fr; }
  .studio__frame { aspect-ratio: 3 / 2; }
  .intro h1 br { display: none; }
  .masthead__line { display: none; }
  main { padding-bottom: 64px; }
}

@media (max-width: 420px) {
  .result__actions { grid-template-columns: 1fr; }
  .intro { padding-top: 20px; }
}

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

/* ---------- article body on exam pages ---------- */

.article {
  max-width: 68ch;
  margin: 56px 0 0;
  padding-top: 34px;
  border-top: 1px solid var(--line, #cdd2cb);
}

.article h2 {
  font-family: "Archivo", sans-serif;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: -0.02em;
  margin: 36px 0 10px;
}

.article h2:first-child { margin-top: 0; }

.article h3 {
  font-family: "IBM Plex Sans", sans-serif;
  font-weight: 600;
  font-size: 16.5px;
  margin: 24px 0 6px;
}

.article p {
  margin: 0 0 14px;
  color: var(--ink-soft, #4d5b68);
  line-height: 1.65;
}

.related { list-style: none; margin: 14px 0 0; padding: 0; }

.related li { border-bottom: 1px solid var(--line, #cdd2cb); }

.related a {
  display: block;
  padding: 12px 0;
  font-size: 15px;
  text-decoration: none;
  color: var(--backdrop, #1f4e79);
}

.related a:hover { color: var(--backdrop-deep, #13314c); text-decoration: underline; }

.sizes td a { font-weight: 500; text-decoration: none; white-space: nowrap; }
.sizes td a:hover { text-decoration: underline; }

@media (max-width: 860px) {
  .article { margin-top: 40px; }
}

/* ---------- FAQ accordions ---------- */

.qa {
  border-bottom: 1px solid var(--line, #cdd2cb);
}

.qa summary {
  cursor: pointer;
  padding: 14px 0;
  font-weight: 600;
  font-size: 15.5px;
  color: var(--ink, #0e1a24);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.qa summary::-webkit-details-marker { display: none; }

.qa summary::before {
  content: "+";
  font-family: "IBM Plex Mono", monospace;
  font-weight: 500;
  color: var(--backdrop, #1f4e79);
  flex: none;
  width: 14px;
}

.qa[open] summary::before { content: "\2212"; }

.qa summary:hover { color: var(--backdrop, #1f4e79); }

.qa p { margin: 0 0 16px 24px; }

.qa + h2 { margin-top: 36px; }