/* N1K.PRO foundation — internal page layouts */

main {
  display: block;
}

.wrap {
  padding-inline: var(--page-pad);
}

.section {
  padding-block: clamp(64px, 9vw, 132px);
  border-top: 1px solid var(--line-soft);
}

.section:first-of-type {
  border-top: 0;
}

.section-head {
  max-inline-size: 60ch;
  margin-bottom: clamp(40px, 6vw, 72px);
}

.section-index {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 24px;
  color: var(--quiet);
  font: 500 10px/1.3 "JetBrains Mono", monospace;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.section-index span {
  color: var(--accent);
}

h1, h2, h3, h4 {
  text-wrap: balance;
  letter-spacing: -.045em;
  font-family: "Unbounded", sans-serif;
  font-weight: 440;
}

.section-head h2,
.section h2 {
  margin: 0;
  font-size: clamp(1.7rem, 3.1vw, 2.9rem);
  line-height: 1.08;
}

em.serif,
h1 em,
h2 em,
h3 em {
  color: var(--accent);
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-weight: 400;
  letter-spacing: -.02em;
}

.lead {
  max-inline-size: 56ch;
  color: var(--muted);
  font-size: clamp(1rem, 1.15vw, 1.15rem);
  line-height: 1.62;
  text-wrap: pretty;
}

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

.page-hero {
  position: relative;
  isolation: isolate;
  overflow: clip;
  padding-block: clamp(72px, 12vw, 152px) clamp(48px, 7vw, 96px);
  border-bottom: 1px solid var(--line-soft);
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(120% 90% at 82% 0%, rgba(var(--accent-rgb), .1), transparent 52%),
    linear-gradient(180deg, rgba(var(--accent-rgb), .05), transparent 40%),
    var(--page);
}

.page-hero .scene-echo {
  position: absolute;
  inset: 0;
  z-index: -1;
  object-fit: cover;
  object-position: 70% 20%;
  opacity: .16;
  -webkit-mask-image: linear-gradient(90deg, transparent 0, #000 60%, transparent 100%);
  mask-image: linear-gradient(90deg, transparent 0, #000 60%, transparent 100%);
  pointer-events: none;
}

.page-hero-inner {
  max-inline-size: 68ch;
}

.page-hero h1 {
  margin: 0;
  font-size: clamp(2.1rem, 5.4vw, 4.4rem);
  line-height: 1.02;
  letter-spacing: -.055em;
}

.page-hero .lead {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 3.5vw, 40px);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  color: var(--quiet);
  font: 500 11px/1 "JetBrains Mono", monospace;
  letter-spacing: .04em;
}

.breadcrumb li::after {
  content: "/";
  margin-left: 8px;
  color: var(--faint);
}

.breadcrumb li:last-child::after {
  content: none;
}

.breadcrumb a:hover {
  color: var(--ink);
}

.breadcrumb [aria-current="page"] {
  color: var(--muted);
}

/* ---------- Card grids ---------- */

.card-grid {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.card-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: clamp(26px, 3vw, 40px);
  background: var(--panel);
  transition: background-color .3s var(--ease);
}

a.card:hover,
a.card:focus-visible {
  background: var(--panel-2);
}

.card .card-num {
  font: 500 10px/1 "JetBrains Mono", monospace;
  color: var(--accent);
}

.card h3 {
  margin: 0;
  font-size: clamp(1.15rem, 1.6vw, 1.4rem);
  line-height: 1.16;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.55;
  text-wrap: pretty;
}

.card .card-foot {
  margin-top: auto;
  padding-top: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--quiet);
  font: 500 11px/1 "JetBrains Mono", monospace;
}

a.card .card-foot i {
  color: var(--accent);
  font-style: normal;
  transition: transform .25s var(--ease);
}

a.card:hover .card-foot i {
  transform: translateX(3px);
}

/* ---------- Definition rows (case anatomy, process) ---------- */

.rows {
  border-top: 1px solid var(--line);
}

.row {
  display: grid;
  grid-template-columns: minmax(160px, 260px) 1fr;
  gap: clamp(16px, 4vw, 64px);
  padding: clamp(26px, 3vw, 38px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.row dt,
.row .row-key {
  margin: 0;
  color: var(--ink);
  font: 500 11px/1.5 "JetBrains Mono", monospace;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.row dd,
.row .row-val {
  margin: 0;
  max-inline-size: 66ch;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.62;
  text-wrap: pretty;
}

.row dd strong,
.row .row-val strong {
  color: var(--ink);
  font-weight: 600;
}

.row dd + dd {
  margin-top: 10px;
}

/* numbered list */
.steps {
  counter-reset: step;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.step {
  counter-increment: step;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  padding: clamp(22px, 2.6vw, 32px);
  background: var(--panel);
}

.step::before {
  content: counter(step, decimal-leading-zero);
  font: 500 12px/1 "JetBrains Mono", monospace;
  color: var(--accent);
  padding-top: 5px;
}

.step h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.step p {
  margin: 0;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.55;
  text-wrap: pretty;
}

/* ---------- Registry / list ---------- */

.registry {
  border-top: 1px solid var(--line);
}

.registry-row {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: clamp(16px, 3vw, 40px);
  padding: clamp(24px, 3vw, 36px) 4px;
  border-bottom: 1px solid var(--line-soft);
  transition: padding .3s var(--ease), background-color .3s var(--ease);
}

a.registry-row:hover,
a.registry-row:focus-visible {
  padding-inline: 16px;
  background: rgba(var(--accent-rgb), .06);
}

.registry-row .r-num {
  color: var(--accent);
  font: 500 11px/1 "JetBrains Mono", monospace;
}

.registry-row h3 {
  margin: 0 0 8px;
  font-size: clamp(1.15rem, 1.7vw, 1.55rem);
  line-height: 1.14;
}

.registry-row p {
  margin: 0;
  max-inline-size: 62ch;
  color: var(--muted);
  font-size: 14.5px;
  line-height: 1.5;
  text-wrap: pretty;
}

.registry-row .r-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  text-align: right;
}

.registry-row .r-side .r-year {
  color: var(--quiet);
  font: 500 11px/1 "JetBrains Mono", monospace;
}

/* ---------- Prose (articles) ---------- */

.article {
  max-inline-size: 72ch;
  margin-inline: auto;
  padding-block: clamp(56px, 7vw, 96px);
}

.prose {
  font-size: 1.07rem;
  line-height: 1.72;
  color: var(--ink);
}

.prose > * + * {
  margin-top: 1.35em;
}

.prose p {
  color: rgba(241, 240, 235, .82);
  text-wrap: pretty;
  max-inline-size: 68ch;
}

.prose h2 {
  margin-top: 1.9em;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  line-height: 1.14;
}

.prose h3 {
  margin-top: 1.6em;
  font-size: 1.2rem;
}

.prose a {
  color: var(--accent);
  border-bottom: 1px solid rgba(var(--accent-rgb), .4);
  padding-bottom: 1px;
}

.prose a:hover {
  border-bottom-color: var(--accent);
}

.prose ul,
.prose ol {
  padding-left: 1.2em;
  color: rgba(241, 240, 235, .82);
}

.prose li + li {
  margin-top: .5em;
}

.prose blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 24px;
  border-left: 2px solid var(--accent);
  color: var(--ink);
  font-family: "Instrument Serif", Georgia, serif;
  font-style: italic;
  font-size: 1.3rem;
  line-height: 1.4;
}

.prose code {
  font-family: "JetBrains Mono", monospace;
  font-size: .86em;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(255, 255, 255, .06);
}

.callout {
  margin: 1.8em 0;
  padding: 22px 24px;
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--accent);
  border-radius: 4px;
  background: var(--panel);
}

.callout p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.callout strong {
  color: var(--ink);
}

/* ---------- Article meta / header ---------- */

.article-head {
  max-inline-size: 72ch;
  margin: 0 auto;
  padding-block: clamp(72px, 10vw, 128px) 0;
}

.article-head h1 {
  margin: 20px 0 0;
  font-size: clamp(1.9rem, 4.4vw, 3.4rem);
  line-height: 1.05;
  letter-spacing: -.05em;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 20px;
  align-items: center;
  margin-top: 26px;
  color: var(--quiet);
  font: 500 11px/1.4 "JetBrains Mono", monospace;
  letter-spacing: .04em;
}

.article-meta time {
  color: var(--muted);
}

/* ---------- Q&A (research) ---------- */

.qa {
  border-top: 1px solid var(--line);
}

.qa-item {
  padding: clamp(28px, 3.4vw, 44px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.qa-item .q-top {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}

.qa-item .q-id {
  color: var(--accent);
  font: 500 11px/1 "JetBrains Mono", monospace;
}

.qa-item h3 {
  margin: 0 0 14px;
  max-inline-size: 40ch;
  font-size: clamp(1.2rem, 2vw, 1.65rem);
  line-height: 1.16;
}

.qa-item p {
  margin: 0;
  max-inline-size: 68ch;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
  text-wrap: pretty;
}

.qa-item p + p {
  margin-top: 12px;
}

/* ---------- CTA band ---------- */

.cta-band {
  display: grid;
  gap: 26px;
  padding: clamp(56px, 8vw, 112px) var(--page-pad);
  border-top: 1px solid var(--line-soft);
  background:
    radial-gradient(90% 140% at 88% 0%, rgba(var(--accent-rgb), .12), transparent 55%),
    var(--panel);
}

.cta-band h2 {
  margin: 0;
  max-inline-size: 22ch;
  font-size: clamp(1.8rem, 3.6vw, 3.2rem);
  line-height: 1.05;
}

.cta-band p {
  margin: 0;
  max-inline-size: 52ch;
  color: var(--muted);
  font-size: 1.05rem;
  text-wrap: pretty;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 8px;
}

/* ---------- Definition of a two-column split ---------- */

.split {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: clamp(40px, 6vw, 96px);
  align-items: start;
}

.stack-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.stack-list li {
  display: grid;
  grid-template-columns: 20px 1fr;
  gap: 14px;
  padding-block: 14px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--muted);
  font-size: 15px;
  line-height: 1.55;
}

.stack-list li::before {
  content: "";
  margin-top: 9px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--accent);
  transform: rotate(45deg);
}

.stack-list strong {
  color: var(--ink);
  font-weight: 600;
}

.stack-copy {
  min-width: 0;
}

.stack-copy--status {
  display: grid;
  justify-items: start;
  gap: 10px;
}

/* status legend */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* pull metric (facts, not fake) */
.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  margin-top: 28px;
}

.fact {
  padding: 26px;
  background: var(--panel);
}

.fact b {
  display: block;
  font-family: "Unbounded", sans-serif;
  font-weight: 460;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  letter-spacing: -.05em;
  color: var(--ink);
}

.fact span {
  display: block;
  margin-top: 8px;
  color: var(--quiet);
  font: 500 11px/1.4 "JetBrains Mono", monospace;
  letter-spacing: .04em;
}

/* ---------- 404 ---------- */

.void {
  display: grid;
  place-content: center;
  gap: 26px;
  min-height: 70vh;
  padding: 80px var(--page-pad);
  text-align: center;
}

.void .code {
  font: 500 12px/1 "JetBrains Mono", monospace;
  letter-spacing: .3em;
  color: var(--accent);
  text-transform: uppercase;
}

.void h1 {
  margin: 0;
  font-size: clamp(2.4rem, 8vw, 5rem);
  line-height: .98;
}

.void p {
  margin: 0 auto;
  max-inline-size: 44ch;
  color: var(--muted);
  text-wrap: pretty;
}

.void .void-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 8px;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .card-grid.cols-3 { grid-template-columns: 1fr 1fr; }
  .split { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  .card-grid.cols-2,
  .card-grid.cols-3 { grid-template-columns: 1fr; }

  .row {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .registry-row {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .registry-row .r-side {
    flex-direction: row;
    align-items: center;
    text-align: left;
  }

  .step {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .step::before { padding-top: 0; }
}