/* =========================================================
   Function Psi — about: studio dossier
   ========================================================= */

body.about {
  background:
    radial-gradient(circle at 88% 4%, rgba(255, 184, 107, 0.06), transparent 30rem),
    radial-gradient(circle at 4% 46%, rgba(201, 255, 74, 0.035), transparent 24rem),
    var(--bg);
}

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

.dossier-hero {
  position: relative;
  padding-top: calc(var(--header-h) + clamp(3.5rem, 7vw, 6rem));
  overflow: hidden;
  border-bottom: 1px solid var(--line);
}

.dossier-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(243, 241, 234, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(243, 241, 234, 0.035) 1px, transparent 1px);
  background-size: 5rem 5rem;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent 78%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent 78%);
}

.dossier-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(12rem, 0.62fr) minmax(0, 2fr);
  align-items: end;
  gap: clamp(2rem, 6vw, 7rem);
  min-height: 55svh;
  padding-bottom: clamp(2.5rem, 5vw, 4.5rem);
}

.dossier-hero__meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.5rem;
  padding-bottom: 0.4rem;
}

.dossier-hero__file {
  display: grid;
  gap: 0.55rem;
  width: 100%;
  margin: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.dossier-hero__file div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.dossier-hero__file dt,
.dossier-hero__file dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.dossier-hero__file dt {
  color: var(--quiet);
}

.dossier-hero__file dd {
  color: var(--ink-dim);
  text-align: right;
}

.dossier-stamp {
  display: inline-block;
  padding: 0.45rem 0.65rem;
  border: 1px solid rgba(201, 255, 74, 0.45);
  color: var(--lime);
  font-family: var(--mono);
  font-size: 0.54rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  transform: rotate(-3deg);
}

.dossier-hero__main {
  position: relative;
  z-index: 2;
}

.dossier-hero h1 {
  font-size: clamp(4.4rem, 12.5vw, 14rem);
  line-height: 0.76;
  letter-spacing: -0.085em;
}

.dossier-hero h1 em {
  color: var(--lime);
  font-family: var(--serif);
  font-weight: 400;
}

.dossier-hero__lede {
  max-width: 39rem;
  margin-top: clamp(1.8rem, 3.4vw, 2.8rem);
  color: var(--ink-dim);
  font-size: clamp(1rem, 1.35vw, 1.22rem);
  line-height: 1.62;
}

.dossier-hero__main .link-arrow {
  margin-top: 1.6rem;
}

.dossier-hero__mark {
  position: absolute;
  right: -0.08em;
  bottom: -0.12em;
  z-index: 0;
  color: rgba(243, 241, 234, 0.035);
  font-family: var(--serif);
  font-size: min(46vw, 34rem);
  font-style: italic;
  line-height: 0.7;
  pointer-events: none;
}

.dossier-hero__strip {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: clamp(1.2rem, 3vw, 3rem);
  padding: 0.85rem 0;
  border-top: 1px solid var(--line);
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
}

.dossier-hero__strip span {
  display: inline-flex;
  align-items: center;
  gap: clamp(1.2rem, 3vw, 3rem);
}

.dossier-hero__strip span::after {
  content: "·";
  color: var(--lime);
}

/* ---------- layout ---------- */

.dossier {
  display: grid;
  grid-template-columns: minmax(12rem, 15rem) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 7rem);
  padding-block: clamp(3rem, 6vw, 5rem) clamp(5rem, 10vw, 9rem);
}

.dossier__rail {
  position: sticky;
  top: calc(var(--header-h) + 2rem);
  align-self: start;
}

.dossier__nav {
  display: grid;
  gap: 0.15rem;
  margin-top: 1.2rem;
  border-top: 1px solid var(--line);
}

.dossier__nav a {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color 0.25s ease, padding-left 0.3s var(--ease-out);
}

.dossier__nav a span {
  color: var(--quiet);
  font-size: 0.55rem;
  letter-spacing: 0;
}

.dossier__nav a:hover,
.dossier__nav a:focus-visible,
.dossier__nav a.is-active {
  padding-left: 0.35rem;
  color: var(--lime);
}

.dossier__nav a.is-active span {
  color: var(--lime);
}

.dossier__rail-note {
  display: grid;
  gap: 0.25rem;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.54rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.dossier__rail-note span {
  color: var(--quiet);
}

.dossier__rail-note strong {
  margin-bottom: 0.5rem;
  color: var(--ink-dim);
  font-weight: 400;
}

.dossier__body {
  min-width: 0;
}

.dossier-section {
  padding-block: clamp(2.6rem, 5vw, 4.5rem);
  border-top: 1px solid var(--line);
}

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

.dossier-section__head {
  display: grid;
  grid-template-columns: 2.8rem minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 1rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.4rem);
}

.dossier-section__num {
  color: var(--lime);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
}

.dossier-section__head h2 {
  font-size: clamp(2.1rem, 4.2vw, 3.8rem);
}

.dossier-section__tag {
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.06em;
  text-align: right;
  text-transform: uppercase;
}

.dossier-section__content {
  max-width: 54rem;
  margin-left: 3.8rem;
  color: var(--muted);
  font-size: 0.98rem;
  line-height: 1.68;
}

.dossier-section__content > p + p {
  margin-top: 1rem;
}

.dossier-section__content strong {
  color: var(--ink);
  font-weight: 500;
}

.dossier-lede {
  max-width: 46rem;
  color: var(--ink);
  font-size: clamp(1.3rem, 2.1vw, 1.75rem);
  line-height: 1.38;
  letter-spacing: -0.02em;
}

.dossier-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 2rem;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.dossier-fact {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1.1rem 1.2rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.dossier-fact__label {
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.54rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.dossier-fact__value {
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 400;
  letter-spacing: -0.01em;
}

.dossier-fact__meta {
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.03em;
}

.dossier-margin {
  position: relative;
  margin-top: 2.2rem;
  padding: 1rem 1.2rem 1rem 1.5rem;
  border-left: 2px solid var(--lime);
  background: rgba(201, 255, 74, 0.035);
}

.dossier-margin span {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--lime);
  font-family: var(--mono);
  font-size: 0.52rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.dossier-margin p {
  max-width: 34rem;
  color: var(--ink-dim);
  font-family: var(--serif);
  font-size: 1.4rem;
  font-style: italic;
  line-height: 1.3;
}

.dossier-quote {
  max-width: 40rem;
  margin: 2rem 0;
  color: var(--ink);
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 3.6rem);
  font-style: italic;
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.dossier-steps {
  display: grid;
  margin-top: 1.8rem;
  border-top: 1px solid var(--line);
}

.dossier-step {
  display: grid;
  grid-template-columns: 2.5rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.35rem 0;
  border-bottom: 1px solid var(--line);
}

.dossier-step__num {
  padding-top: 0.25rem;
  color: var(--lime);
  font-family: var(--mono);
  font-size: 0.58rem;
  letter-spacing: 0.05em;
}

.dossier-step__copy h3 {
  font-size: clamp(1.25rem, 2vw, 1.7rem);
  line-height: 1;
}

.dossier-step__copy p {
  max-width: 38rem;
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.93rem;
  line-height: 1.6;
}

.toolkit-table {
  display: grid;
  margin-top: 1.8rem;
  border-top: 1px solid var(--line);
}

.toolkit-line {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr) 7rem;
  gap: 1rem;
  align-items: baseline;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--line);
}

.toolkit-line__label {
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.55rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.toolkit-line__value {
  color: var(--ink-dim);
  font-size: 0.92rem;
}

.toolkit-line__note {
  color: var(--quiet);
  font-family: var(--serif);
  font-size: 1rem;
  font-style: italic;
  text-align: right;
}

.toolkit-bench {
  margin-top: 1.8rem;
  padding: 1.2rem 1.3rem;
  border: 1px dashed var(--line-strong);
  border-radius: 0.5rem;
}

.toolkit-bench .eyebrow {
  margin-bottom: 0.6rem;
  color: var(--quiet);
}

.toolkit-bench p {
  color: var(--muted);
  font-size: 0.9rem;
}

.colophon-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 1.8rem 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.colophon-list div {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.9rem 1rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.colophon-list dt {
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.52rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.colophon-list dd {
  margin: 0;
  color: var(--ink-dim);
  font-size: 0.85rem;
  line-height: 1.45;
}

.colophon-list a {
  color: var(--lime);
  border-bottom: 1px solid rgba(201, 255, 74, 0.35);
}

.dossier-section--contact {
  margin-top: 1rem;
  padding: clamp(1.8rem, 4vw, 3rem);
  border: 1px solid rgba(201, 255, 74, 0.28);
  background:
    radial-gradient(circle at 88% 12%, rgba(201, 255, 74, 0.08), transparent 20rem),
    var(--panel);
}

.dossier-section--contact .dossier-section__content {
  margin-left: 0;
}

.dossier-contact__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

.dossier-contact__note {
  margin-top: 1.2rem;
  color: var(--quiet);
  font-size: 0.56rem;
}

@media (max-width: 1000px) {
  .dossier {
    grid-template-columns: 11rem minmax(0, 1fr);
    gap: 2.5rem;
  }

  .dossier-section__content {
    margin-left: 0;
  }

  .dossier-section__tag {
    display: none;
  }

  .dossier-section__head {
    grid-template-columns: 2.2rem minmax(0, 1fr);
  }
}

@media (max-width: 800px) {
  .dossier-hero__grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
    min-height: 0;
  }

  .dossier-hero__meta {
    order: 2;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 1rem;
  }

  .dossier-hero__meta > .eyebrow {
    grid-column: 1 / -1;
  }

  .dossier-hero__file {
    border-top: 0;
    padding-top: 0;
  }

  .dossier-stamp {
    align-self: end;
    white-space: nowrap;
  }

  .dossier-hero__mark {
    font-size: 52vw;
    bottom: auto;
    top: 6rem;
  }

  .dossier {
    grid-template-columns: 1fr;
    gap: 0;
    padding-top: 2rem;
  }

  .dossier__rail {
    position: static;
    display: flex;
    align-items: center;
    gap: 1rem;
    padding-bottom: 1.5rem;
    overflow-x: auto;
    scrollbar-width: none;
  }

  .dossier__rail::-webkit-scrollbar {
    display: none;
  }

  .dossier__rail > .eyebrow,
  .dossier__rail-note {
    display: none;
  }

  .dossier__nav {
    display: flex;
    gap: 0;
    margin-top: 0;
    border-top: 0;
  }

  .dossier__nav a {
    padding: 0.55rem 0.8rem;
    border: 1px solid var(--line);
    border-right: 0;
    white-space: nowrap;
  }

  .dossier__nav a:first-child {
    border-radius: 999px 0 0 999px;
  }

  .dossier__nav a:last-child {
    border-right: 1px solid var(--line);
    border-radius: 0 999px 999px 0;
  }

  .dossier__nav a:hover,
  .dossier__nav a:focus-visible,
  .dossier__nav a.is-active {
    padding-left: 0.8rem;
  }

  .dossier__nav a span {
    display: none;
  }

  .dossier-section:first-child {
    border-top: 1px solid var(--line);
    padding-top: 2.4rem;
  }
}

@media (max-width: 600px) {
  .dossier-hero h1 {
    font-size: clamp(3.6rem, 17vw, 6.5rem);
  }

  .dossier-hero__meta {
    grid-template-columns: 1fr;
  }

  .dossier-hero__file {
    gap: 0.4rem;
  }

  .dossier-stamp {
    justify-self: start;
  }

  .dossier-facts,
  .colophon-list {
    grid-template-columns: 1fr;
  }

  .dossier-section__head {
    grid-template-columns: 1.8rem minmax(0, 1fr);
    gap: 0.6rem;
  }

  .toolkit-line {
    grid-template-columns: 5rem minmax(0, 1fr);
  }

  .toolkit-line__note {
    display: none;
  }

  .dossier-step {
    grid-template-columns: 1.8rem minmax(0, 1fr);
    gap: 0.7rem;
  }

  .dossier-section--contact {
    padding: 1.4rem;
  }
}

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