:root {
  --paper: oklch(96% 0.015 88);
  --paper-deep: oklch(92% 0.022 88);
  --paper-light: oklch(98% 0.009 88);
  --ink: oklch(27% 0.055 244);
  --ink-soft: oklch(46% 0.035 235);
  --teal: oklch(55% 0.105 190);
  --teal-deep: oklch(42% 0.09 190);
  --orange: oklch(65% 0.17 48);
  --orange-soft: oklch(92% 0.05 67);
  --line: oklch(84% 0.022 88);
  --shadow-image: 0 14px 36px rgb(25 37 45 / 0.12);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --radius-xl: 22px;
  --font-display: "Songti SC", STSong, "Noto Serif CJK SC", Georgia, serif;
  --font-body: "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  color-scheme: light;
}

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

html {
  scroll-behavior: smooth;
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 4%, rgb(255 255 255 / 0.58), transparent 28rem),
    var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.055'/%3E%3C/svg%3E");
  content: "";
  pointer-events: none;
}

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

button,
input {
  font: inherit;
}

button,
a {
  touch-action: manipulation;
}

:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  color: var(--paper-light);
  background: var(--ink);
  transform: translateY(-180%);
  transition: transform 160ms var(--ease-out);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid var(--line);
  background: color-mix(in oklch, var(--paper) 94%, transparent);
}

.header-inner {
  display: flex;
  width: min(1280px, calc(100% - 48px));
  min-height: 64px;
  margin: 0 auto;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.wordmark {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  text-decoration: none;
}

.wordmark-mark {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  color: var(--paper-light);
  background: var(--orange);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 800;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.header-nav a {
  display: inline-flex;
  min-height: 44px;
  padding: 0 12px;
  align-items: center;
  border-radius: var(--radius-md);
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 650;
  text-decoration: none;
  transition: color 180ms var(--ease-out), background-color 180ms var(--ease-out), transform 180ms var(--ease-out);
}

.header-nav a:active,
.button:active {
  transform: scale(0.96);
}

.progress-track {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 3px;
  overflow: hidden;
}

.progress-bar {
  width: 100%;
  height: 100%;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
}

.container {
  width: min(1280px, calc(100% - 48px));
  margin-inline: auto;
}

.hero {
  display: grid;
  min-height: calc(100svh - 64px);
  padding: 76px 0 96px;
  grid-template-columns: minmax(0, 5fr) minmax(360px, 7fr);
  align-items: center;
  gap: clamp(40px, 7vw, 112px);
}

.eyebrow,
.article-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--teal-deep);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.eyebrow::before,
.article-kicker::before {
  width: 30px;
  height: 3px;
  background: var(--orange);
  content: "";
}

.hero h1 {
  max-width: 6em;
  margin: 24px 0 26px;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 8vw, 7.5rem);
  font-weight: 700;
  letter-spacing: -0.022em;
  line-height: 0.93;
  text-wrap: balance;
}

.hero-lede {
  max-width: 29em;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 2vw, 1.32rem);
  line-height: 1.72;
  text-wrap: pretty;
}

.hero-actions {
  display: flex;
  margin-top: 36px;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  min-height: 48px;
  padding: 0 20px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: var(--radius-md);
  color: var(--paper-light);
  background: var(--ink);
  font-size: 15px;
  font-weight: 750;
  text-decoration: none;
  box-shadow: 0 6px 18px rgb(25 37 45 / 0.16);
  transition: transform 180ms var(--ease-out), box-shadow 180ms var(--ease-out);
}

.text-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: var(--teal-deep);
  font-weight: 750;
  text-decoration: none;
}

.hero-visual {
  position: relative;
  align-self: stretch;
  min-height: 560px;
}

.hero-visual::before {
  position: absolute;
  top: -20px;
  right: -24px;
  width: 42%;
  height: 42%;
  border-radius: 50%;
  background: var(--orange-soft);
  content: "";
}

.hero-image-main {
  position: absolute;
  top: 4%;
  right: 0;
  width: 86%;
  height: 68%;
  border-radius: var(--radius-xl);
  object-fit: cover;
  outline: 1px solid rgb(21 38 50 / 0.12);
  outline-offset: -1px;
  box-shadow: var(--shadow-image);
}

.hero-image-small {
  position: absolute;
  bottom: 5%;
  left: 0;
  width: 48%;
  height: 42%;
  border: 10px solid var(--paper);
  border-radius: var(--radius-xl);
  object-fit: cover;
  outline: 1px solid rgb(21 38 50 / 0.12);
  outline-offset: -11px;
  box-shadow: var(--shadow-image);
}

.hero-caption {
  position: absolute;
  right: 4%;
  bottom: 0;
  max-width: 18em;
  color: var(--ink-soft);
  font-size: 13px;
}

.stats-strip {
  border-block: 1px solid var(--line);
  background: var(--paper-deep);
}

.stats-inner {
  display: grid;
  min-height: 132px;
  grid-template-columns: repeat(3, 1fr);
  align-items: center;
}

.stat {
  display: flex;
  min-height: 72px;
  padding: 12px 32px;
  align-items: baseline;
  gap: 14px;
}

.stat + .stat {
  border-left: 1px solid var(--line);
}

.stat strong {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5vw, 4.8rem);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}

.stat span {
  max-width: 8em;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.4;
}

.catalog {
  padding: 120px 0 144px;
}

.section-heading {
  display: grid;
  margin-bottom: 68px;
  grid-template-columns: 1fr 1fr;
  align-items: end;
  gap: 48px;
}

.section-heading h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 5.2rem);
  letter-spacing: -0.022em;
  line-height: 1;
}

.section-heading p {
  max-width: 34em;
  margin: 0;
  color: var(--ink-soft);
  font-size: 17px;
  text-wrap: pretty;
}

.search-field {
  position: relative;
  width: min(100%, 620px);
}

.search-field input {
  width: 100%;
  min-height: 50px;
  padding: 0 48px 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  color: var(--ink);
  background: var(--paper-light);
  outline: none;
  transition: border-color 160ms var(--ease-out), box-shadow 160ms var(--ease-out);
}

.search-field input:focus {
  border-color: var(--teal);
  box-shadow: 0 0 0 4px color-mix(in oklch, var(--teal) 18%, transparent);
}

.search-field::after {
  position: absolute;
  top: 50%;
  right: 16px;
  color: var(--teal-deep);
  content: "⌕";
  font-size: 24px;
  transform: translateY(-52%);
}

.search-status {
  color: var(--ink-soft);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.category-navigation {
  display: grid;
  margin-bottom: 44px;
  border-block: 1px solid var(--line);
  grid-template-columns: repeat(7, minmax(0, 1fr));
}

.category-link {
  display: flex;
  min-height: 96px;
  padding: 18px 16px;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  text-decoration: none;
  transition: color 180ms var(--ease-out), background-color 180ms var(--ease-out);
}

.category-link + .category-link {
  border-left: 1px solid var(--line);
}

.category-link span {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
}

.category-link small {
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.4;
}

.catalog-toolbar {
  display: grid;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper-light);
  grid-template-columns: minmax(260px, 1fr) auto auto;
  align-items: center;
  gap: 20px;
}

.status-filters,
.directory-actions {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.filter-button,
.directory-actions button {
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  background: transparent;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  transition: color 160ms var(--ease-out), border-color 160ms var(--ease-out), background-color 160ms var(--ease-out), transform 160ms var(--ease-out);
}

.filter-button.is-active {
  border-color: var(--ink);
  color: var(--paper-light);
  background: var(--ink);
}

.directory-actions {
  padding-left: 14px;
  border-left: 1px solid var(--line);
}

.directory-actions button {
  border-color: transparent;
  border-radius: var(--radius-md);
  color: var(--teal-deep);
}

.directory-status {
  display: flex;
  min-height: 64px;
  padding-inline: 4px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.status-key {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 12px;
}

.status-key i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.key-published {
  background: var(--teal);
}

.key-upcoming {
  margin-left: 8px;
  border: 1px solid var(--line);
  background: transparent;
}

.roadmap {
  border-top: 1px solid var(--ink);
}

.roadmap-category {
  scroll-margin-top: 88px;
  padding: 68px 0 84px;
  border-bottom: 1px solid var(--ink);
}

.category-heading {
  display: flex;
  margin-bottom: 28px;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
}

.category-heading > div {
  display: flex;
  align-items: baseline;
  gap: 18px;
}

.category-index {
  color: var(--orange);
  font-family: var(--font-display);
  font-size: 32px;
  line-height: 1;
}

.category-heading h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.8rem);
  letter-spacing: -0.02em;
  line-height: 1;
}

.category-heading p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
}

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

.volume {
  border-bottom: 1px solid var(--line);
}

.volume summary {
  display: grid;
  min-height: 92px;
  padding: 18px 4px;
  grid-template-columns: 62px minmax(240px, 1fr) auto 28px;
  align-items: center;
  gap: 18px;
  cursor: pointer;
  list-style: none;
}

.volume summary::-webkit-details-marker {
  display: none;
}

.volume-number {
  color: var(--orange);
  font-family: var(--font-display);
  font-size: 30px;
  font-variant-numeric: tabular-nums;
}

.volume-heading {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 3px;
}

.volume-heading strong {
  font-family: var(--font-display);
  font-size: 22px;
  line-height: 1.35;
}

.volume-heading small {
  overflow: hidden;
  color: var(--ink-soft);
  font-size: 11px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.volume-progress {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.volume-progress.has-published {
  border-color: color-mix(in oklch, var(--teal) 38%, var(--line));
  color: var(--teal-deep);
  background: color-mix(in oklch, var(--teal) 8%, var(--paper));
}

.volume-toggle {
  position: relative;
  width: 24px;
  height: 24px;
}

.volume-toggle::before,
.volume-toggle::after {
  position: absolute;
  top: 11px;
  left: 5px;
  width: 14px;
  height: 1px;
  background: var(--ink);
  content: "";
  transition: transform 180ms var(--ease-out);
}

.volume-toggle::after {
  transform: rotate(90deg);
}

.volume[open] .volume-toggle::after {
  transform: rotate(0deg);
}

.volume-content {
  padding: 4px 4px 32px 80px;
}

.topic-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
  columns: 2;
  column-gap: 48px;
}

.topic-row {
  break-inside: avoid;
  border-bottom: 1px solid var(--line);
}

.topic-row > a,
.topic-row > div {
  display: grid;
  min-height: 52px;
  padding: 10px 4px;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.topic-number {
  color: var(--ink-soft);
  font-size: 11px;
  font-variant-numeric: tabular-nums;
}

.topic-title {
  line-height: 1.45;
}

.topic-state {
  color: var(--ink-soft);
  font-size: 11px;
  white-space: nowrap;
}

.topic-row.is-published .topic-title,
.topic-row.is-published .topic-state {
  color: var(--teal-deep);
  font-weight: 750;
}

.topic-row.is-upcoming .topic-title {
  color: color-mix(in oklch, var(--ink) 68%, var(--paper));
}

.volume-gap {
  padding: 26px 28px;
  border-radius: var(--radius-lg);
  background: var(--paper-deep);
}

.volume-gap strong {
  color: var(--orange);
  font-family: var(--font-display);
  font-size: 20px;
}

.volume-gap p {
  max-width: 50em;
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.catalog-empty {
  padding: 72px 0;
  color: var(--ink-soft);
  text-align: center;
}

.article-header {
  padding: 96px 0 88px;
  border-bottom: 1px solid var(--line);
}

.article-header-inner {
  display: grid;
  grid-template-columns: minmax(0, 8fr) minmax(220px, 3fr);
  align-items: end;
  gap: clamp(40px, 8vw, 120px);
}

.article-header h1 {
  max-width: 12em;
  margin: 24px 0 28px;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 5.7rem);
  font-weight: 700;
  letter-spacing: -0.022em;
  line-height: 1.02;
  text-wrap: balance;
}

.article-summary {
  max-width: 42em;
  margin: 0;
  color: var(--ink-soft);
  font-size: clamp(1.08rem, 2vw, 1.32rem);
  line-height: 1.75;
  text-wrap: pretty;
}

.article-meta {
  display: grid;
  gap: 20px;
}

.meta-row {
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.meta-row span {
  display: block;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.1em;
}

.meta-row strong {
  display: block;
  margin-top: 4px;
  font-family: var(--font-display);
  font-size: 20px;
}

.article-layout {
  display: grid;
  padding: 80px 0 120px;
  grid-template-columns: 220px minmax(0, 760px);
  justify-content: center;
  gap: clamp(54px, 8vw, 120px);
}

.article-toc {
  position: sticky;
  top: 96px;
  align-self: start;
}

.article-toc h2 {
  margin: 0 0 18px;
  color: var(--ink-soft);
  font-size: 12px;
  letter-spacing: 0.14em;
}

.article-toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-toc a {
  display: block;
  padding: 7px 0;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.45;
  text-decoration: none;
  transition: color 160ms var(--ease-out), transform 160ms var(--ease-out);
}

.article-toc a[aria-current="true"] {
  color: var(--teal-deep);
  font-weight: 750;
  transform: translateX(6px);
}

.article-body {
  min-width: 0;
}

.article-body p,
.article-body li {
  color: color-mix(in oklch, var(--ink) 92%, var(--paper));
  font-size: 18px;
  line-height: 1.9;
  text-wrap: pretty;
}

.article-body p {
  margin: 0 0 1.6em;
}

.article-body h2 {
  margin: 3.3em 0 0.85em;
  scroll-margin-top: 96px;
  font-family: var(--font-display);
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  letter-spacing: -0.012em;
  line-height: 1.2;
  text-wrap: balance;
}

.article-body h2:first-child {
  margin-top: 0;
}

.article-body figure {
  width: min(920px, calc(100vw - 48px));
  margin: 58px 0 66px 50%;
  transform: translateX(-50%);
}

.article-body figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  background: var(--paper-deep);
  outline: 1px solid rgb(21 38 50 / 0.11);
  outline-offset: -1px;
  box-shadow: var(--shadow-image);
}

.article-body figcaption {
  max-width: 62em;
  margin: 13px auto 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.55;
  text-align: center;
}

.knowledge-card,
.article-note {
  position: relative;
  margin: 44px 0;
  padding: 28px 30px;
  border-radius: var(--radius-lg);
  background: var(--orange-soft);
}

.knowledge-card::before {
  display: block;
  width: 42px;
  height: 4px;
  margin-bottom: 18px;
  background: var(--orange);
  content: "";
}

.knowledge-card p,
.article-note p {
  margin: 0;
  color: color-mix(in oklch, var(--ink) 88%, var(--orange));
  font-size: 17px;
  line-height: 1.8;
}

.article-note {
  padding: 20px 24px;
  background: var(--paper-deep);
}

.article-note p {
  color: var(--ink-soft);
  font-size: 14px;
}

.article-body ul {
  display: grid;
  margin: 0;
  padding: 0;
  gap: 12px;
  list-style: none;
}

.article-body li {
  position: relative;
  padding-left: 22px;
}

.article-body li::before {
  position: absolute;
  top: 0.83em;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal);
  content: "";
}

.article-body a {
  color: var(--teal-deep);
  font-weight: 650;
}

.article-navigation {
  display: grid;
  margin-top: 96px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.next-article {
  padding: 22px 0;
  text-decoration: none;
}

.next-article:last-child {
  text-align: right;
}

.next-article span {
  display: block;
  color: var(--ink-soft);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.1em;
}

.next-article strong {
  display: block;
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: 22px;
}

.site-footer {
  padding: 64px 0 calc(48px + env(safe-area-inset-bottom));
  color: var(--paper);
  background: var(--ink);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 48px;
}

.footer-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 3.4rem);
}

.footer-copy {
  max-width: 44em;
  margin: 0;
  color: color-mix(in oklch, var(--paper) 72%, var(--ink));
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  color: color-mix(in oklch, var(--paper) 82%, var(--ink));
  font-size: 14px;
}

.simple-page {
  min-height: 65svh;
  padding: 96px 0 128px;
}

.simple-page-inner {
  max-width: 760px;
}

.simple-page-wide {
  max-width: 1120px;
}

.simple-page h1 {
  margin: 20px 0 36px;
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 6rem);
  letter-spacing: -0.022em;
  line-height: 1;
}

.simple-page h2 {
  margin: 2.6em 0 0.7em;
  font-family: var(--font-display);
  font-size: 28px;
}

.simple-page p,
.simple-page li {
  color: var(--ink-soft);
  font-size: 18px;
  line-height: 1.85;
}

.simple-page .page-intro {
  max-width: 760px;
  color: var(--ink);
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  line-height: 1.75;
}

.independence-note {
  display: grid;
  margin-top: 52px;
  padding: 28px 32px;
  border-block: 1px solid var(--line);
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 32px;
}

.independence-note strong {
  color: var(--orange);
  font-family: var(--font-display);
  font-size: 20px;
}

.independence-note p {
  margin: 0;
  font-size: 16px;
}

.creation-story,
.quality-standard {
  margin-top: 112px;
}

.about-section-heading {
  display: grid;
  margin-bottom: 48px;
  grid-template-columns: minmax(240px, 0.8fr) minmax(320px, 1.2fr);
  align-items: start;
  column-gap: 64px;
}

.about-section-heading > span {
  grid-column: 1 / -1;
  margin-bottom: 14px;
  color: var(--teal-deep);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.simple-page .about-section-heading h2 {
  margin: 0;
  font-size: clamp(2.2rem, 4vw, 4rem);
  line-height: 1.06;
}

.about-section-heading p {
  margin: 0;
  font-size: 16px;
}

.creation-steps {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--ink);
  list-style: none;
}

.simple-page .creation-steps li {
  display: grid;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 20px;
}

.creation-steps > li > span {
  color: var(--orange);
  font-family: var(--font-display);
  font-size: 30px;
  line-height: 1;
}

.creation-steps li > div {
  display: grid;
  grid-template-columns: minmax(190px, 0.55fr) minmax(280px, 1.45fr);
  gap: 48px;
}

.creation-steps h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 22px;
}

.creation-steps p {
  margin: 0;
  font-size: 16px;
}

.standard-list {
  margin: 0;
  border-top: 1px solid var(--ink);
}

.standard-list > div {
  display: grid;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
  grid-template-columns: minmax(190px, 0.55fr) minmax(280px, 1.45fr);
  gap: 48px;
}

.standard-list dt {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
}

.standard-list dd {
  margin: 0;
  color: var(--ink-soft);
  font-size: 16px;
  line-height: 1.8;
}

.about-usage {
  max-width: 760px;
  margin-top: 96px;
}

.error-code {
  color: var(--orange);
  font-family: var(--font-display);
  font-size: clamp(5rem, 20vw, 13rem);
  line-height: 0.8;
}

.reveal-ready .reveal {
  opacity: 0;
  transform: translateY(16px);
}

.reveal-ready .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 600ms var(--ease-out), transform 600ms var(--ease-out);
}

@media (hover: hover) {
  .header-nav a:hover {
    color: var(--ink);
    background: var(--paper-deep);
  }

  .button:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgb(25 37 45 / 0.2);
  }

  .category-link:hover,
  .volume summary:hover {
    color: var(--teal-deep);
    background: color-mix(in oklch, var(--teal) 6%, transparent);
  }

  .topic-row.is-published a:hover .topic-title,
  .next-article:hover strong {
    color: var(--orange);
  }

  .filter-button:hover,
  .directory-actions button:hover {
    border-color: var(--teal);
    color: var(--teal-deep);
  }
}

@media (max-width: 1040px) {
  .hero {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: 760px;
  }

  .hero-visual {
    min-height: 620px;
  }

  .category-navigation {
    overflow-x: auto;
    grid-template-columns: repeat(7, minmax(152px, 1fr));
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
  }

  .catalog-toolbar {
    grid-template-columns: minmax(260px, 1fr) auto;
  }

  .directory-actions {
    padding-left: 0;
    border-left: 0;
    grid-column: 1 / -1;
  }

  .article-layout {
    grid-template-columns: minmax(0, 760px);
  }

  .article-toc {
    position: static;
    display: none;
  }
}

@media (max-width: 760px) {
  .header-inner,
  .container {
    width: min(100% - 32px, 1280px);
  }

  .header-nav .nav-secondary {
    display: none;
  }

  .hero {
    padding: 52px 0 80px;
    gap: 42px;
  }

  .hero h1 {
    max-width: 7em;
  }

  .hero-visual {
    min-height: 430px;
  }

  .hero-image-main {
    width: 92%;
    height: 70%;
  }

  .hero-image-small {
    width: 52%;
    height: 42%;
    border-width: 7px;
    outline-offset: -8px;
  }

  .hero-caption {
    right: 0;
    bottom: -12px;
  }

  .hero-visual::before {
    right: 0;
  }

  .stats-inner {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .stat {
    padding: 24px 8px;
  }

  .stat + .stat {
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .catalog {
    padding: 88px 0 100px;
  }

  .section-heading {
    margin-bottom: 44px;
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .category-navigation {
    margin-right: -16px;
    margin-left: -16px;
    padding-inline: 16px;
    border-top: 0;
  }

  .category-link {
    min-height: 88px;
  }

  .category-link:first-child {
    border-left: 1px solid var(--line);
  }

  .category-link:last-child {
    border-right: 1px solid var(--line);
  }

  .catalog-toolbar {
    padding: 16px;
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .status-filters,
  .directory-actions {
    width: 100%;
  }

  .directory-actions {
    grid-column: auto;
  }

  .directory-status {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
  }

  .roadmap-category {
    padding: 52px 0 64px;
  }

  .category-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .volume summary {
    min-height: 104px;
    padding: 16px 0;
    grid-template-columns: 44px minmax(0, 1fr) 24px;
    gap: 12px;
  }

  .volume-number {
    font-size: 24px;
  }

  .volume-heading strong {
    font-size: 19px;
  }

  .volume-progress {
    width: max-content;
    margin-top: 5px;
    grid-column: 2;
    grid-row: 2;
  }

  .volume-toggle {
    grid-column: 3;
    grid-row: 1 / span 2;
  }

  .volume-content {
    padding: 2px 0 26px 44px;
  }

  .topic-list {
    columns: 1;
  }

  .topic-row > a,
  .topic-row > div {
    min-height: 58px;
    grid-template-columns: 30px minmax(0, 1fr) auto;
  }

  .volume-gap {
    padding: 22px;
  }

  .article-header {
    padding: 64px 0 56px;
  }

  .article-header-inner {
    grid-template-columns: 1fr;
    gap: 46px;
  }

  .article-meta {
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
  }

  .article-layout {
    padding: 56px 0 88px;
  }

  .article-body p,
  .article-body li {
    font-size: 17px;
    line-height: 1.86;
  }

  .article-body figure {
    width: calc(100vw - 24px);
    margin-block: 42px 52px;
  }

  .article-navigation {
    grid-template-columns: 1fr;
  }

  .next-article:last-child {
    border-top: 1px solid var(--line);
    text-align: left;
  }

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

  .simple-page {
    padding: 72px 0 96px;
  }

  .independence-note,
  .about-section-heading,
  .creation-steps li > div,
  .standard-list > div {
    grid-template-columns: 1fr;
  }

  .independence-note {
    padding-inline: 0;
    gap: 8px;
  }

  .creation-story,
  .quality-standard {
    margin-top: 80px;
  }

  .about-section-heading {
    gap: 20px;
  }

  .simple-page .creation-steps li {
    grid-template-columns: 48px minmax(0, 1fr);
    gap: 12px;
  }

  .creation-steps li > div,
  .standard-list > div {
    gap: 8px;
  }
}

@media (max-width: 420px) {
  .wordmark-text {
    font-size: 17px;
  }

  .hero-visual {
    min-height: 340px;
  }

  .hero-caption {
    display: none;
  }

  .article-meta {
    grid-template-columns: 1fr;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal-ready .reveal {
    opacity: 1;
    transform: none;
  }
}