/* ==========================================================================
   NPX Exchange Ltd — npxexchange.top
   Long-form letter / annual-report identity:
   "Introducing NPX: A Long-Term Builder for the Global Digital Asset Market"
   Palette: warm paper, forest green, copper, ink
   Type: Newsreader (serif) / Inter (UI and body)
   Structure:
     01. Tokens and reset
     02. Base typography and utilities
     03. Masthead and navigation
     04. Letter head, table of contents, drop cap
     05. Chapters and margin notes
     06. Editorial elements: figures, tables, footnotes
     07. Page interiors (principles, platform, transparency, FAQ)
     08. Footer and NPX network
     09. Responsive breakpoints
   ========================================================================== */

/* 01. Tokens and reset
   ========================================================================== */
:root {
  --paper: #fbf8f1;
  --paper-soft: #f4eee2;
  --paper-deep: #ece4d4;
  --green: #143a2f;
  --green-deep: #0e2a22;
  --green-soft: #2c5747;
  --copper: #a8622f;
  --copper-soft: #c98b5b;
  --copper-light: #e3b48e;
  --copper-ink: #9a5427;
  --ink: #1d2420;
  --muted: #5f665f;
  --rule: rgba(20, 58, 47, 0.22);
  --rule-soft: rgba(20, 58, 47, 0.12);
  --paper-rule: rgba(251, 248, 241, 0.22);
  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  --sans: "Inter", "Segoe UI", Helvetica, Arial, sans-serif;
  --page: 1120px;
  --margin-col: 216px;
  --gutter: 40px;
  --reading: 720px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--green);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: rgba(168, 98, 47, 0.55);
}

a:hover {
  color: var(--copper-ink);
  text-decoration-color: var(--copper);
}

:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 3px;
}

h1,
h2,
h3,
h4 {
  font-family: var(--serif);
  font-weight: 500;
  color: var(--green);
  margin: 0;
  letter-spacing: -0.012em;
}

p {
  margin: 0 0 1.25em;
}

ul,
ol {
  margin: 0 0 1.25em;
  padding-left: 1.3em;
}

/* 02. Base typography and utilities
   ========================================================================== */
.page {
  max-width: var(--page);
  margin-inline: auto;
  padding-inline: 28px;
}

main {
  display: block;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 20px;
  z-index: 200;
  background: var(--green);
  color: var(--paper);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 12px 18px;
  text-decoration: none;
}

.skip-link:focus {
  top: 12px;
}

.kicker {
  font-family: var(--sans);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--copper-ink);
  margin: 0 0 18px;
}

.section-label,
.chapter-label {
  font-family: var(--sans);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--copper-ink);
  margin: 0 0 12px;
}

.lede {
  font-family: var(--serif);
  font-size: clamp(20px, 2.1vw, 24px);
  line-height: 1.55;
  color: var(--green);
}

.text-link {
  color: var(--green);
  text-decoration-color: var(--copper);
}

.rule {
  border: 0;
  height: 1px;
  background: var(--rule);
  margin: 0;
}

/* 03. Masthead and navigation
   ========================================================================== */
.masthead {
  border-bottom: 1px solid var(--rule);
}

.masthead-top {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding-block: 10px;
  border-bottom: 1px solid var(--rule-soft);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

.masthead-top .edition {
  color: var(--copper-ink);
  letter-spacing: 0.16em;
}

.masthead-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding-block: 24px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  color: var(--green);
}

.brand:hover {
  color: var(--green);
}

.brand-mark {
  font-family: var(--serif);
  font-size: 32px;
  line-height: 1;
  letter-spacing: 0.01em;
}

.brand-sub {
  font-family: var(--sans);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
}

.primary-nav ul {
  display: flex;
  align-items: center;
  gap: 26px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.primary-nav a {
  display: inline-block;
  padding: 4px 0;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.primary-nav a:hover {
  color: var(--copper-ink);
  border-bottom-color: var(--copper);
}

.primary-nav a[aria-current="page"] {
  color: var(--copper-ink);
  border-bottom-color: var(--copper);
}

/* 04. Letter head, table of contents, drop cap
   ========================================================================== */
.col-grid {
  display: grid;
  grid-template-columns: var(--margin-col) minmax(0, var(--reading));
  column-gap: var(--gutter);
  align-items: start;
}

.letter-head {
  padding-block: clamp(44px, 6vw, 76px) 30px;
}

.head-margin {
  padding-top: 8px;
  font-size: 11px;
  line-height: 1.6;
  color: var(--muted);
}

.head-margin .hm-rule {
  width: 34px;
  height: 1px;
  background: var(--copper);
  margin-bottom: 12px;
}

.head-margin p {
  margin-bottom: 8px;
}

.head-margin .hm-label {
  font-size: 9.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper-ink);
  font-weight: 600;
}

.letter-head h1 {
  font-size: clamp(40px, 5.4vw, 62px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin-bottom: 22px;
  text-wrap: balance;
}

.letter-dek {
  font-family: var(--serif);
  font-size: clamp(19px, 2vw, 23px);
  line-height: 1.5;
  color: var(--green-soft);
  max-width: 40em;
  margin: 0;
}

.byline {
  margin-top: 26px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

/* Table of contents */
.toc {
  padding-block: 6px 0;
  margin-bottom: 10px;
}

.toc-inner {
  border-top: 2px solid var(--green);
  border-bottom: 1px solid var(--rule);
  padding: 22px 0 10px;
  max-width: var(--reading);
  margin-left: calc(var(--margin-col) + var(--gutter));
}

.toc-title {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--copper-ink);
  margin-bottom: 12px;
}

.toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: toc;
  columns: 2;
  column-gap: 44px;
}

.toc li {
  counter-increment: toc;
  break-inside: avoid;
  border-bottom: 1px solid var(--rule-soft);
}

.toc a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 9px 0;
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.35;
  color: var(--green);
  text-decoration: none;
}

.toc a::before {
  content: counter(toc, decimal-leading-zero);
  font-family: var(--sans);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--copper-ink);
  flex: none;
}

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

.toc-note {
  margin-top: 14px;
  font-size: 11.5px;
  color: var(--muted);
}

.toc-note a {
  color: var(--green);
}

/* Drop cap */
.dropcap::first-letter {
  float: left;
  font-family: var(--serif);
  font-size: 4.6em;
  line-height: 0.78;
  font-weight: 500;
  color: var(--green);
  padding: 0.08em 0.12em 0 0;
}

/* 05. Chapters and margin notes
   ========================================================================== */
.letter-body {
  padding-bottom: clamp(50px, 7vw, 90px);
}

.chapter {
  display: grid;
  grid-template-columns: var(--margin-col) minmax(0, var(--reading));
  column-gap: var(--gutter);
  align-items: start;
  padding-block: clamp(30px, 4vw, 46px);
  border-top: 1px solid var(--rule);
}

.chapter:first-of-type {
  border-top: 0;
  padding-top: 26px;
}

.chapter-body {
  grid-column: 2;
  min-width: 0;
  max-width: 100%;
}

.marginnote {
  grid-column: 1;
  grid-row: 1;
  padding-top: 6px;
  border-top: 1px solid var(--copper);
  font-size: 11.5px;
  line-height: 1.65;
  color: var(--muted);
}

.marginnote .mn-num {
  display: block;
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1.2;
  color: var(--copper-ink);
  margin-bottom: 4px;
}

.marginnote p {
  margin-bottom: 0;
}

.chapter-body h2 {
  font-size: clamp(29px, 3.3vw, 38px);
  line-height: 1.14;
  margin-bottom: 18px;
  text-wrap: balance;
}

.chapter-body h3 {
  font-size: clamp(21px, 2.2vw, 25px);
  line-height: 1.3;
  margin: 28px 0 10px;
}

.chapter-body p {
  margin-bottom: 1.3em;
}

.chapter-body p:last-child {
  margin-bottom: 0;
}

.chapter-body em {
  font-family: var(--serif);
  font-size: 1.06em;
  color: var(--green);
}

.chapter-body strong {
  font-weight: 600;
}

.chapter-body ul,
.chapter-body ol {
  margin: 18px 0 24px;
  padding-left: 1.35em;
}

.chapter-body li {
  margin-bottom: 8px;
}

.chapter-body li::marker {
  color: var(--copper);
}

/* 06. Editorial elements: figures, tables, notes
   ========================================================================== */
.letter-figure {
  margin: 34px 0;
}

.duotone {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--green);
  border: 1px solid var(--green-deep);
}

.duotone img {
  width: 100%;
  height: auto;
  filter: grayscale(1) contrast(1.06);
  mix-blend-mode: luminosity;
  opacity: 0.96;
}

.duotone::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--copper);
  mix-blend-mode: soft-light;
  opacity: 0.38;
  pointer-events: none;
}

.letter-figure figcaption {
  margin-top: 10px;
  font-size: 11.5px;
  line-height: 1.6;
  color: var(--muted);
}

.letter-figure figcaption b {
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper-ink);
  margin-right: 8px;
}

.pull-line {
  margin: 34px 0;
  padding: 18px 0 18px 24px;
  border-left: 2px solid var(--copper);
  font-family: var(--serif);
  font-size: clamp(22px, 2.4vw, 28px);
  font-style: italic;
  line-height: 1.4;
  color: var(--green);
}

.pull-line p {
  margin: 0;
}

.table-wrap {
  overflow-x: auto;
  min-width: 0;
  max-width: 100%;
  margin: 28px 0 30px;
}

.status-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  line-height: 1.55;
}

.status-table caption {
  text-align: left;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper-ink);
  padding-bottom: 10px;
}

.status-table th,
.status-table td {
  text-align: left;
  vertical-align: top;
  padding: 11px 14px 11px 0;
  border-bottom: 1px solid var(--rule-soft);
}

.status-table thead th {
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--rule);
}

.status-table td:first-child {
  font-weight: 600;
  color: var(--green);
  width: 34%;
}

.status-table td {
  color: var(--ink);
}

.status-table td:last-child,
.status-table th:last-child {
  padding-right: 0;
}

.status {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--green);
  border-bottom: 1px solid var(--copper);
  white-space: nowrap;
}

.status--dev {
  color: var(--copper-ink);
}

.callout {
  margin: 30px 0;
  padding: 20px 24px;
  background: var(--paper-soft);
  border-top: 1px solid var(--green);
  border-bottom: 1px solid var(--rule);
}

.callout p {
  margin-bottom: 10px;
  font-size: 15px;
}

.callout p:last-child {
  margin-bottom: 0;
}

.callout .callout-label {
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--copper-ink);
  margin-bottom: 8px;
}

.footnotes {
  margin-top: 42px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
  font-size: 11.5px;
  line-height: 1.65;
  color: var(--muted);
}

.footnotes h2 {
  font-family: var(--sans);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--copper-ink);
  margin-bottom: 10px;
}

.footnotes ol {
  margin: 0;
  padding-left: 18px;
}

.footnotes li {
  margin-bottom: 7px;
}

sup.ref a {
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--copper-ink);
  text-decoration: none;
  padding-left: 1px;
}

sup.ref a:hover {
  text-decoration: underline;
}

.disclaimer {
  margin-top: 30px;
  padding-top: 16px;
  border-top: 1px solid var(--rule-soft);
  font-size: 11.5px;
  line-height: 1.65;
  color: var(--muted);
}

/* 07. Page interiors
   ========================================================================== */
.subpage-head {
  padding-block: clamp(38px, 5vw, 60px) 24px;
}

.crumbs {
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 20px;
}

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

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

.crumbs span {
  color: var(--copper-ink);
  margin-inline: 8px;
}

.subpage-head h1 {
  font-size: clamp(36px, 4.6vw, 54px);
  line-height: 1.06;
  letter-spacing: -0.018em;
  margin-bottom: 20px;
  max-width: 15em;
  text-wrap: balance;
}

.subpage-head .letter-dek {
  font-size: clamp(18px, 1.8vw, 21px);
}

.subpage-body {
  padding-bottom: clamp(50px, 7vw, 86px);
}

.subpage-body .chapter:first-of-type {
  border-top: 1px solid var(--rule);
  padding-top: clamp(30px, 4vw, 44px);
}

/* Principles */
.principle {
  padding-block: 30px;
  border-top: 1px solid var(--rule);
}

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

.principle h2 {
  font-size: clamp(27px, 3vw, 34px);
  line-height: 1.15;
  margin-bottom: 14px;
}

.principle .principle-num {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--copper-ink);
  margin-bottom: 8px;
}

/* FAQ */
.faq-list {
  border-top: 2px solid var(--green);
}

.faq-item {
  padding-block: 24px;
  border-bottom: 1px solid var(--rule);
}

.faq-item h2 {
  font-size: clamp(22px, 2.3vw, 26px);
  line-height: 1.3;
  margin-bottom: 10px;
}

.faq-item p {
  margin-bottom: 0;
  font-size: 16px;
}

/* 08. Footer and NPX network
   ========================================================================== */
.site-footer {
  margin-top: 0;
  background: var(--green);
  color: var(--paper);
}

.footer-inner {
  max-width: var(--page);
  margin-inline: auto;
  padding: clamp(44px, 5vw, 64px) 28px 28px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(30px, 5vw, 64px);
  padding-bottom: 34px;
  border-bottom: 1px solid var(--paper-rule);
}

.footer-brand .brand-mark {
  color: var(--paper);
  font-size: 28px;
}

.footer-brand p {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(251, 248, 241, 0.66);
  line-height: 1.7;
}

.footer-network h2 {
  font-size: 22px;
  color: var(--paper);
  margin-bottom: 8px;
}

.footer-network .section-label {
  color: var(--copper-light);
  margin-bottom: 8px;
}

.footer-network > p {
  font-size: 13px;
  line-height: 1.65;
  color: rgba(251, 248, 241, 0.72);
  max-width: 60ch;
  margin-bottom: 18px;
}

.footer-network ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 30px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-network li {
  border-top: 1px solid var(--paper-rule);
}

.footer-network a {
  display: block;
  padding: 11px 0;
  color: var(--paper);
  text-decoration: none;
}

.footer-network a:hover {
  color: var(--copper-light);
}

.footer-network .net-name {
  display: block;
  font-size: 13.5px;
  line-height: 1.4;
}

.footer-network .net-domain {
  display: block;
  margin-top: 2px;
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(251, 248, 241, 0.7);
}

.footer-legal {
  padding-top: 24px;
  font-size: 10.5px;
  line-height: 1.7;
  color: rgba(251, 248, 241, 0.66);
}

.footer-legal p {
  max-width: 96ch;
  margin-bottom: 10px;
}

.footer-legal strong {
  color: var(--paper);
  font-weight: 600;
}

.footer-legal a {
  color: var(--paper);
  text-decoration-color: rgba(251, 248, 241, 0.4);
}

.footer-legal a:hover {
  color: var(--copper-soft);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--paper-rule);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(251, 248, 241, 0.7);
}

.footer-meta a {
  color: rgba(251, 248, 241, 0.7);
  text-decoration: none;
}

.footer-meta a:hover {
  color: var(--copper-soft);
}

/* 09. Responsive breakpoints
   ========================================================================== */
@media (max-width: 960px) {
  .col-grid,
  .chapter {
    grid-template-columns: minmax(0, 1fr);
    column-gap: 0;
  }

  .chapter-body {
    grid-column: 1;
  }

  .marginnote {
    grid-column: 1;
    grid-row: auto;
    margin-top: 24px;
    padding-top: 14px;
    max-width: 52ch;
    font-size: 12px;
  }

  .chapter {
    display: flex;
    flex-direction: column;
  }

  .chapter-body {
    order: 1;
  }

  .marginnote {
    order: 2;
  }

  .head-margin {
    display: none;
  }

  .letter-head,
  .subpage-head {
    padding-block: 38px 22px;
  }

  .toc ol {
    columns: 1;
  }

  .toc-inner {
    max-width: 100%;
    margin-left: 0;
  }

  .footer-top {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 16px;
  }

  .page {
    padding-inline: 20px;
  }

  .masthead-top {
    font-size: 9px;
    letter-spacing: 0.12em;
  }

  .masthead-top .top-focus {
    display: none;
  }

  .masthead-main {
    flex-wrap: wrap;
    gap: 14px;
    padding-block: 18px;
  }

  .primary-nav {
    width: 100%;
  }

  .primary-nav ul {
    flex-wrap: wrap;
    gap: 8px 18px;
    padding-top: 12px;
    border-top: 1px solid var(--rule-soft);
  }

  .primary-nav a {
    font-size: 9.5px;
    letter-spacing: 0.12em;
  }

  .letter-head h1 {
    font-size: clamp(34px, 9.4vw, 46px);
  }

  .letter-dek {
    font-size: 18px;
  }

  .subpage-head h1 {
    font-size: clamp(30px, 8.4vw, 40px);
  }

  .toc a {
    font-size: 16px;
  }

  .chapter-body h2 {
    font-size: 27px;
  }

  .dropcap::first-letter {
    font-size: 3.8em;
  }

  .footer-inner {
    padding-inline: 20px;
  }

  .footer-network ul {
    grid-template-columns: 1fr;
  }

  .status-table {
    min-width: 540px;
  }
}

@media (max-width: 420px) {
  .brand-sub {
    display: none;
  }

  .masthead-top .edition {
    display: none;
  }

  .letter-head h1 {
    font-size: 32px;
  }

  .subpage-head h1 {
    font-size: 29px;
  }

  .chapter {
    padding-block: 28px;
  }

  .pull-line {
    padding-left: 16px;
    font-size: 21px;
  }

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

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

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}