/* ==========================================================================
   project.css -- detail-page layer for projects/*.html.
   Loaded AFTER styles.css and only by the detail pages, so it reuses the v2
   tokens from :root and adds nothing to the shared stylesheet. No token is
   redefined here and no existing site class is restyled.

   Same rules as styles.css: hairline borders, no shadows, no gradients,
   radius <= 8px, mono for every number and label.
   ========================================================================== */

/* --- page column ----------------------------------------------------------
   One column at a 72ch measure, centred, with the hairlines drawn inside it.
   ch is measured on the 14px body face, so the padding sits outside the
   measure instead of eating into it. */
.pj-header,
.pj-main,
.pj-footer {
  max-width: calc(72ch + (2 * var(--sp-24)));
  margin: 0 auto;
  padding-left: var(--sp-24);
  padding-right: var(--sp-24);
}

.pj-header {
  padding-top: var(--sp-64);
  padding-bottom: var(--sp-32);
  border-bottom: 1px solid var(--line);
}

.pj-main {
  padding-top: var(--sp-48);
  padding-bottom: var(--sp-64);
}

.pj-footer {
  padding-top: var(--sp-32);
  padding-bottom: var(--sp-64);
  border-top: 1px solid var(--line);
}

/* --- back link -----------------------------------------------------------
   44px hit area on every link back to the portfolio, so the touch target
   holds even though the text is 13px mono. */
.pj-back {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  color: var(--muted);
  transition: color var(--t-fast);
}

.pj-back:hover {
  color: var(--accent);
}

/* --- head ----------------------------------------------------------------- */
.pj-kicker {
  margin-top: var(--sp-24);
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  line-height: 1.4;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}

/* One type step between the hero clamp and --fs-h2: project titles are longer
   than the hero headline, so they need a lower ceiling to stay at 2 lines. */
.pj-title {
  margin-top: var(--sp-12);
  max-width: 34ch;
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.pj-lead {
  margin-top: var(--sp-16);
  max-width: 62ch;
  font-size: var(--fs-lead);
  line-height: 1.6;
  color: var(--muted);
}

/* --- meta pairs ---------------------------------------------------------- */
.pj-meta {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: var(--sp-4) var(--sp-16);
  margin-top: var(--sp-24);
  padding-top: var(--sp-16);
  border-top: 1px solid var(--line);
}

.pj-meta-label {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  line-height: 1.6;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* dd keeps no browser indent: the grid column does the aligning. */
.pj-meta-value {
  margin: 0;
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--text);
}

/* --- sections ------------------------------------------------------------ */
.pj-section {
  padding-top: var(--sp-48);
}

.pj-section:first-child {
  padding-top: 0;
}

.pj-h2 {
  margin-bottom: var(--sp-16);
  padding-bottom: var(--sp-8);
  border-bottom: 1px solid var(--line);
  font-size: var(--fs-h3);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.pj-section p {
  max-width: 72ch;
  font-size: var(--fs-body);
  line-height: 1.6;
}

/* --- architecture figure -------------------------------------------------
   figcaption is styled globally in styles.css and is left alone. Only the
   image needs a rule, because this figure uses the detail-page class. */
.pj-figure {
  margin: 0;
  overflow: hidden;
  background: var(--surface-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}

.pj-figure img {
  width: 100%;
}

/* --- proof table ---------------------------------------------------------
   What / Value / Scope and source. Values are mono and tabular so the
   columns line up and two figures can be compared at a glance. */
.pj-proof {
  width: 100%;
  margin-top: var(--sp-24);
  border-collapse: collapse;
  font-size: var(--fs-body);
}

.pj-proof th,
.pj-proof td {
  padding: var(--sp-12);
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.pj-proof thead th {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  font-weight: 500;
  line-height: 1.4;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.pj-proof tbody tr:last-child td {
  border-bottom: 0;
}

.pj-proof-label {
  min-width: 12ch;
  color: var(--text);
}

.pj-proof-value {
  font-family: var(--font-mono);
  font-size: var(--fs-h3);
  line-height: 1.2;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.pj-proof-note {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  line-height: 1.6;
  color: var(--muted);
}

/* --- stack tags ----------------------------------------------------------
   .tech-chip is defined in styles.css; this only arranges the row. */
.pj-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-8);
}

/* --- footer --------------------------------------------------------------- */
.pj-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-8) var(--sp-24);
}

.pj-footer-note {
  font-family: var(--font-mono);
  font-size: var(--fs-mono-s);
  line-height: 1.6;
  color: var(--muted);
}

.pj-footer-link {
  color: var(--muted);
  border-bottom: 1px solid var(--line);
  transition: color var(--t-fast), border-color var(--t-fast);
}

.pj-footer-link:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* --- focus ---------------------------------------------------------------
   One visible ring for every link on the detail page; the ring on .tech-chip
   comes from styles.css. */
.project-page a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --- responsive ----------------------------------------------------------
   At <=640px the proof table stops being a table: each measurement becomes a
   block that reads like the card proof, value first. The header row stays in
   the DOM (clipped, not removed) so the columns are still announced. */
@media (max-width: 640px) {
  .pj-header {
    padding-top: var(--sp-48);
  }

  .pj-section {
    padding-top: var(--sp-32);
  }

  .pj-title {
    max-width: none;
  }

  .pj-meta {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }

  .pj-meta-value {
    margin-bottom: var(--sp-8);
  }

  .pj-proof thead {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }

  .pj-proof,
  .pj-proof tbody,
  .pj-proof tr,
  .pj-proof td {
    display: block;
    width: 100%;
  }

  .pj-proof tbody tr {
    padding: var(--sp-16) 0;
    border-top: 1px solid var(--line);
  }

  .pj-proof tbody td {
    padding: 0;
    border-bottom: 0;
  }

  .pj-proof-value {
    display: block;
    font-size: var(--fs-h2);
  }

  .pj-proof-label {
    display: block;
    margin-top: var(--sp-4);
  }

  .pj-proof-note {
    display: block;
    margin-top: var(--sp-4);
  }
}

/* --- reduced motion ------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  .pj-back,
  .pj-footer-link {
    transition: none;
  }
}