:root {
  color-scheme: dark;
  --night: #0b1014;
  --panel: #111a20;
  --panel-soft: #152229;
  --line: #2a3a42;
  --text: #e7ede8;
  --muted: #9fb0ad;
  --lime: #c8ef7a;
  --cyan: #67d6c0;
  --orange: #ffad66;
  --paper: #f4f0de;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 12% 4%, rgb(103 214 192 / 10%), transparent 28rem),
    radial-gradient(circle at 88% 16%, rgb(200 239 122 / 8%), transparent 32rem),
    var(--night);
  line-height: 1.6;
}

a {
  color: var(--lime);
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--cyan);
}

:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.55rem 0.8rem;
  color: var(--night);
  background: var(--lime);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgb(11 16 20 / 88%);
  backdrop-filter: blur(16px);
}

.header-inner,
.page-shell,
.site-footer {
  width: min(1180px, calc(100% - 2rem));
  margin-inline: auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 74px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  color: var(--text);
  font-weight: 750;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.brand-icon {
  display: grid;
  width: 2.25rem;
  height: 2.25rem;
  place-items: center;
  border: 1px solid var(--cyan);
  color: var(--cyan);
  font: 700 0.7rem/1 ui-monospace, "SFMono-Regular", Consolas, monospace;
  transform: rotate(-4deg);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.2rem;
  font-size: 0.84rem;
}

.site-nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--lime);
}

.page-shell {
  padding-block: 4.5rem 6rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: clamp(2.5rem, 7vw, 7rem);
  align-items: center;
  min-height: 590px;
  padding-block: 1rem 5rem;
}

.kicker,
.label,
.format-ext,
.eyebrow {
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.kicker,
.eyebrow {
  margin: 0 0 1rem;
  color: var(--cyan);
  font-size: 0.74rem;
  font-weight: 700;
}

h1,
h2,
h3,
p {
  text-wrap: pretty;
}

h1,
h2,
h3 {
  line-height: 1.05;
}

h1 {
  max-width: 12ch;
  margin: 0;
  font-size: clamp(3.2rem, 8vw, 7.5rem);
  letter-spacing: -0.065em;
}

.page-title {
  max-width: 13ch;
  font-size: clamp(3rem, 7vw, 6.3rem);
}

h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.5rem);
  letter-spacing: -0.04em;
}

h3 {
  margin: 0;
  font-size: 1.2rem;
}

.hero-copy,
.intro-copy {
  max-width: 61ch;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.22rem);
}

.hero-copy {
  margin-top: 1.6rem;
}

.file-stack {
  position: relative;
  min-height: 410px;
}

.file-card {
  position: absolute;
  display: grid;
  width: min(100%, 340px);
  min-height: 210px;
  padding: 1.5rem;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 24px 80px rgb(0 0 0 / 32%);
}

.file-card::after {
  position: absolute;
  top: -1px;
  right: -1px;
  width: 2.8rem;
  height: 2.8rem;
  border-bottom: 1px solid var(--line);
  border-left: 1px solid var(--line);
  background: var(--night);
  content: "";
  clip-path: polygon(100% 0, 100% 100%, 0 0);
}

.file-card:nth-child(1) {
  top: 0;
  left: 0;
  transform: rotate(-5deg);
}

.file-card:nth-child(2) {
  top: 94px;
  right: 0;
  border-color: #46635f;
  transform: rotate(4deg);
}

.file-card:nth-child(3) {
  bottom: 0;
  left: 10%;
  border-color: #53643b;
  transform: rotate(-1deg);
}

.file-card .format-ext {
  color: var(--lime);
  font-size: 0.76rem;
}

.file-card strong {
  align-self: end;
  font-size: 3rem;
  letter-spacing: -0.06em;
}

.file-card code,
.data-table code,
.signature {
  color: var(--cyan);
  font: 0.8rem/1.5 ui-monospace, "SFMono-Regular", Consolas, monospace;
}

.section {
  padding-block: 5rem;
  border-top: 1px solid var(--line);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(0, 1.25fr);
  gap: 3rem;
  align-items: end;
  margin-bottom: 2.5rem;
}

.section-head p {
  max-width: 62ch;
  margin: 0;
  color: var(--muted);
}

.format-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.format-card,
.principle-card,
.fact-card {
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgb(21 34 41 / 92%), rgb(17 26 32 / 92%));
}

.format-card {
  display: grid;
  min-height: 280px;
  padding: 1.6rem;
  color: inherit;
  text-decoration: none;
}

.format-card:hover {
  color: inherit;
  border-color: var(--cyan);
}

.format-card .label {
  color: var(--cyan);
  font-size: 0.7rem;
}

.format-card h3 {
  align-self: end;
  margin-top: 3rem;
  font-size: 2rem;
}

.format-card p {
  max-width: 42ch;
  margin-bottom: 0;
  color: var(--muted);
}

.principle-grid,
.facts-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
}

.principle-card,
.fact-card {
  padding: 1.5rem;
}

.principle-card span {
  display: block;
  margin-bottom: 3rem;
  color: var(--orange);
  font: 0.76rem/1 ui-monospace, "SFMono-Regular", Consolas, monospace;
}

.principle-card p,
.fact-card p {
  margin-bottom: 0;
  color: var(--muted);
}

.intro-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.42fr);
  gap: 3rem;
  align-items: end;
  padding-block: 1rem 4rem;
}

.metadata-card {
  padding: 1.35rem;
  border: 1px solid var(--line);
  background: var(--panel);
}

.metadata-card dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.45rem 1rem;
  margin: 0;
}

.metadata-card dt {
  color: var(--muted);
  font-family: ui-monospace, "SFMono-Regular", Consolas, monospace;
  font-size: 0.72rem;
  text-transform: uppercase;
}

.metadata-card dd {
  margin: 0;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--panel);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.data-table th {
  color: var(--muted);
  background: var(--panel-soft);
  font: 0.7rem/1.4 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.data-table tr:last-child td {
  border-bottom: 0;
}

.format-name {
  min-width: 8rem;
  font-size: 1.15rem;
  font-weight: 750;
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.8rem;
}

.badge {
  padding: 0.2rem 0.45rem;
  border: 1px solid var(--line);
  color: var(--muted);
  font: 0.68rem/1.2 ui-monospace, "SFMono-Regular", Consolas, monospace;
}

.callout {
  margin-block: 2rem;
  padding: 1.5rem;
  border-left: 3px solid var(--orange);
  background: var(--panel);
}

.callout h3 {
  margin-bottom: 0.6rem;
}

.callout p {
  margin: 0;
  color: var(--muted);
}

.prose {
  max-width: 780px;
}

.prose h2 {
  margin-top: 3.4rem;
  font-size: 2rem;
}

.prose p,
.prose li {
  color: var(--muted);
  font-size: 1.04rem;
}

.source-list {
  columns: 2;
  column-gap: 3rem;
}

.source-list li {
  break-inside: avoid;
  margin-bottom: 0.7rem;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 2.2rem 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
}

.site-footer p {
  margin: 0;
}

.error-page {
  display: grid;
  min-height: 70vh;
  place-items: center;
  text-align: center;
}

.error-code {
  margin: 0;
  color: var(--lime);
  font: 800 clamp(7rem, 25vw, 16rem)/0.8 ui-monospace, "SFMono-Regular", Consolas, monospace;
  letter-spacing: -0.1em;
}

@media (max-width: 860px) {
  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    padding-block: 1rem;
  }

  .hero,
  .section-head,
  .intro-block {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .file-stack {
    width: min(100%, 520px);
    margin-inline: auto;
  }

  .principle-grid,
  .facts-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .page-shell {
    padding-block: 3rem 4.5rem;
  }

  .format-grid {
    grid-template-columns: 1fr;
  }

  .file-stack {
    min-height: 470px;
  }

  .file-card {
    width: 88%;
  }

  .data-table th:nth-child(4),
  .data-table td:nth-child(4) {
    display: none;
  }

  .source-list {
    columns: 1;
  }

  .site-footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}