:root {
  --paper: #F4EFE6;
  --paper-deep: #E9E1D4;
  --warm-gray: #D8D0C2;
  --terracotta: #A94F2E;
  --terracotta-deep: #8A3D22;
  --terracotta-soft: #E2B39B;
  --ink-green: #3E5A49;
  --ink: #211F1C;
  --rock: #777066;
  --frame: #5F574D;
  --moss: #94A38D;

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --line: 2px solid var(--frame);
  --shadow-hard: 5px 5px 0 0 rgba(95, 87, 77, 0.22);
  --radius: 2px;
  --shell: 1180px;
  --gutter: clamp(1.1rem, 4vw, 2.5rem);
  --header-h: 78px;
}

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

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

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: clamp(16px, 0.35vw + 15px, 18px);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(2.2rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.4rem); }
h3 { font-size: clamp(1.15rem, 1.6vw, 1.45rem); }
h4 { font-family: var(--font-sans); font-size: 1.05rem; font-weight: 700; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: inherit; }

ul, ol { margin: 0; padding-left: 1.15em; }
ul[class], ol[class] { list-style: none; padding-left: 0; }

img, picture, svg, video { display: block; max-width: 100%; }
img { height: auto; }

button { font: inherit; color: inherit; }

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

.shell {
  width: min(calc(100% - (var(--gutter) * 2)), var(--shell));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--paper);
  border: 2px solid var(--paper);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-250%);
  transition: transform 0.2s ease;
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ---------------- 头部 ---------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--paper);
  border-bottom: var(--line);
}

.site-header::before {
  content: "";
  display: block;
  height: 5px;
  background: linear-gradient(90deg,
    var(--terracotta) 0 20%,
    var(--ink-green) 20% 34%,
    var(--moss) 34% 42%,
    var(--warm-gray) 42% 100%);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 3px;
  z-index: 2;
  transform: scaleX(var(--progress, 0));
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--terracotta), var(--ink-green));
  transition: transform 0.12s linear;
  pointer-events: none;
}

.header-shell {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  column-gap: clamp(1rem, 2.4vw, 2.2rem);
  padding-block: 0.8rem;
}

.brand-block {
  grid-column: 1;
  display: flex;
  align-items: center;
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  flex: none;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: var(--terracotta);
  color: var(--paper);
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1;
  border: var(--line);
  box-shadow: 3px 3px 0 0 var(--frame);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.05rem;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.brand:hover .brand-name { color: var(--terracotta-deep); }

.brand-tagline {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.04em;
  color: var(--rock);
  white-space: nowrap;
}

.quick-rail {
  grid-column: 2;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  justify-self: start;
}

.quick-rail__label {
  padding-right: 0.7rem;
  border-right: 1px solid var(--warm-gray);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.3em;
  color: var(--rock);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.6rem;
  background: var(--paper-deep);
  color: var(--ink);
  border: 1.5px solid var(--frame);
  box-shadow: 2px 2px 0 0 rgba(95, 87, 77, 0.35);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.chip:hover { transform: translate(-1px, -1px); box-shadow: 3px 3px 0 0 var(--frame); }
.chip--terracotta { background: var(--terracotta-soft); }
.chip--green { background: var(--moss); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.7rem;
  background: var(--paper-deep);
  border: var(--line);
  box-shadow: 3px 3px 0 0 var(--frame);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  cursor: pointer;
}
.nav-toggle:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 0 var(--frame); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.24s ease;
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.nav-toggle__label { line-height: 1; }

.site-nav {
  grid-column: 3;
  display: flex;
  align-items: center;
  justify-content: flex-end;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 1.2vw, 1.25rem);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a {
  position: relative;
  display: inline-block;
  padding: 0.35rem 0.1rem;
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 3px;
  background: var(--terracotta);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.26s cubic-bezier(0.2, 0.7, 0.3, 1);
}

.nav-list a:hover,
.nav-list a:focus-visible { color: var(--terracotta-deep); }
.nav-list a:hover::after,
.nav-list a:focus-visible::after,
.nav-list a[aria-current="page"]::after { transform: scaleX(1); }
.nav-list a[aria-current="page"] { color: var(--terracotta-deep); }

.nav-scrim { display: none; }

/* ---------------- 页脚 ---------------- */
.site-footer {
  margin-top: clamp(3rem, 8vw, 6.5rem);
  background: var(--warm-gray);
  border-top: var(--line);
  color: var(--ink);
}

.footer-shell { padding-block: clamp(2rem, 5vw, 3.2rem) 0; }

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.6rem 2rem;
  align-items: start;
  padding-bottom: clamp(1.2rem, 3vw, 2rem);
  border-bottom: var(--line);
}

.footer-brandline {
  grid-column: 1;
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.6vw, 1.95rem);
  font-weight: 700;
  line-height: 1.42;
  letter-spacing: 0.01em;
}

.footer-save {
  grid-column: 1;
  margin: 0;
  max-width: 42ch;
  font-size: 0.92rem;
  color: var(--frame);
}

.footer-scale {
  grid-column: 2;
  grid-row: 1 / span 2;
  display: flex;
  gap: 4px;
  width: 116px;
  height: 12px;
}
.footer-scale span {
  flex: 1;
  border: 1.5px solid var(--frame);
}
.footer-scale span:nth-child(1) { background: var(--terracotta-soft); }
.footer-scale span:nth-child(2) { background: var(--moss); }
.footer-scale span:nth-child(3) { background: var(--ink-green); }

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: clamp(1.6rem, 4vw, 3.5rem);
  padding-block: clamp(1.5rem, 3vw, 2.4rem);
}

.footer-col {
  display: grid;
  align-content: start;
  gap: 0.7rem;
  min-width: 0;
}

.footer-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.28em;
  color: var(--frame);
}

.footer-links {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: fi;
}
.footer-links li { counter-increment: fi; }
.footer-links a {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  color: var(--ink);
  font-size: 0.98rem;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 0.12rem;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.footer-links a::before {
  content: counter(fi, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--terracotta-deep);
}
.footer-links a:hover { color: var(--terracotta-deep); border-color: var(--terracotta); }

.contact-list {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.contact-key {
  flex: none;
  min-width: 3.6em;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--frame);
}

.contact-value {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--ink);
  word-break: break-all;
}
.contact-value--text {
  font-family: var(--font-sans);
  font-size: 0.92rem;
  word-break: normal;
}

.copy-btn {
  padding: 0.18rem 0.5rem;
  background: var(--paper);
  color: var(--ink);
  border: 1.5px solid var(--frame);
  box-shadow: 2px 2px 0 0 rgba(95, 87, 77, 0.4);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease;
}
.copy-btn:hover { background: var(--terracotta-soft); }
.copy-btn:active { transform: translate(1px, 1px); }
.copy-btn[data-copied] {
  background: var(--ink-green);
  color: var(--paper);
}

.contact-note {
  margin: 0.2rem 0 0;
  max-width: 44ch;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--frame);
}

.footer-bottom {
  background: var(--ink);
  color: var(--paper);
  border-top: var(--line);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem 1.6rem;
  padding-block: 1.1rem;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-legal a {
  color: var(--paper);
  font-size: 0.85rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(244, 239, 230, 0.35);
  padding-bottom: 0.1rem;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.footer-legal a:hover { color: var(--terracotta-soft); border-color: var(--terracotta-soft); }

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.7rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: rgba(244, 239, 230, 0.74);
}
.meta-sep { color: var(--moss); }

.to-top {
  position: fixed;
  right: clamp(0.9rem, 3vw, 2rem);
  bottom: clamp(0.9rem, 3vw, 2rem);
  z-index: 50;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 0.8rem;
  background: var(--paper);
  color: var(--ink);
  border: var(--line);
  box-shadow: 4px 4px 0 0 var(--frame);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s, background 0.2s ease;
}
.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.to-top:hover { background: var(--terracotta-soft); }
.to-top__arrow { font-size: 0.9rem; line-height: 1; }
.to-top__text { line-height: 1; }

/* ---------------- 通用组件 ---------------- */
.content-wrap { width: 100%; }

.prose { max-width: 66ch; }
.prose > * + * { margin-top: 1.05em; }

.lede {
  max-width: 52ch;
  font-size: clamp(1.05rem, 1.5vw, 1.25rem);
  line-height: 1.75;
  color: var(--frame);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.7rem 1.15rem;
  background: var(--paper-deep);
  color: var(--ink);
  border: var(--line);
  box-shadow: 4px 4px 0 0 var(--frame);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 0 var(--frame); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 0 var(--frame); }
.btn--solid { background: var(--terracotta); color: var(--paper); }
.btn--ghost { background: transparent; }
.btn--sm { padding: 0.45rem 0.8rem; font-size: 0.82rem; box-shadow: 3px 3px 0 0 var(--frame); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding-block: 1rem 0.2rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--rock);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 0.4rem; }
.breadcrumb a {
  color: var(--frame);
  text-decoration: none;
  border-bottom: 1px solid var(--warm-gray);
}
.breadcrumb a:hover { color: var(--terracotta-deep); border-color: var(--terracotta); }
.breadcrumb__sep { color: var(--moss); }

.section-head {
  display: grid;
  gap: 0.4rem;
  margin-bottom: clamp(1.2rem, 3vw, 2rem);
}
.section-index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.26em;
  color: var(--terracotta);
}
.section-title { margin: 0; }

.grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.8rem);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(1.2rem, 3vw, 2.8rem);
  align-items: start;
}

.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--paper-deep);
  border: var(--line);
  box-shadow: 6px 6px 0 0 rgba(95, 87, 77, 0.22);
}
.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1.6rem 0.8rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--paper);
  background: linear-gradient(0deg, rgba(33, 31, 28, 0.82), rgba(33, 31, 28, 0));
}

.media-placeholder {
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  padding: 1rem;
  text-align: center;
  color: var(--frame);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  background:
    repeating-linear-gradient(135deg, rgba(95, 87, 77, 0.1) 0 2px, transparent 2px 10px),
    linear-gradient(150deg, var(--paper-deep) 0%, var(--warm-gray) 52%, var(--terracotta-soft) 100%);
}

.archive-card {
  position: relative;
  padding: clamp(1.7rem, 2.8vw, 2.1rem) clamp(1rem, 2vw, 1.5rem) clamp(1rem, 2vw, 1.5rem);
  background: var(--paper);
  border: var(--line);
  box-shadow: var(--shadow-hard);
}
.archive-card::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 1.4rem;
  width: 62px;
  height: 10px;
  background: var(--terracotta);
  border: 2px solid var(--frame);
  border-top: 0;
}
.archive-card__tab {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--terracotta-deep);
}
.archive-card__title {
  margin: 0 0 0.5rem;
  font-family: var(--font-serif);
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
}
.archive-card__body {
  margin: 0;
  font-size: 0.95rem;
  color: var(--frame);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.15rem 0.5rem;
  background: var(--paper-deep);
  color: var(--ink);
  border: 1.5px solid var(--frame);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-decoration: none;
}
.tag--terracotta { background: var(--terracotta-soft); }
.tag--moss { background: var(--moss); }

.step-card {
  display: grid;
  gap: 0.5rem;
  padding: clamp(1rem, 2vw, 1.4rem);
  background: var(--paper);
  border: var(--line);
  box-shadow: 5px 5px 0 0 rgba(95, 87, 77, 0.2);
}
.step-card__num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--terracotta);
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--paper);
  border: var(--line);
  font-size: 0.92rem;
}
.table-scroll > .data-table { min-width: 520px; }
.data-table caption {
  padding-bottom: 0.5rem;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--rock);
}
.data-table th,
.data-table td {
  padding: 0.65rem 0.8rem;
  border-bottom: 1px solid var(--warm-gray);
  text-align: left;
  vertical-align: top;
}
.data-table thead th {
  background: var(--warm-gray);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}
.data-table tbody tr:hover { background: var(--paper-deep); }

.toc {
  display: grid;
  gap: 0.25rem;
}
.toc__link {
  display: block;
  padding: 0.35rem 0.3rem 0.35rem 0.85rem;
  border-left: 3px solid var(--warm-gray);
  color: var(--frame);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.toc__link:hover { color: var(--ink); border-color: var(--moss); }
.toc__link.is-active {
  color: var(--terracotta-deep);
  border-color: var(--terracotta);
  background: var(--paper-deep);
  font-weight: 700;
}

[data-chapter] { scroll-margin-top: calc(var(--header-h) + 1.25rem); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1240px) {
  .brand-tagline { display: none; }
}

@media (max-width: 1079px) {
  .header-shell {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "brand toggle"
      "quick quick";
    row-gap: 0.6rem;
    padding-block: 0.7rem 0.6rem;
  }
  .brand-block { grid-area: brand; }
  .nav-toggle { grid-area: toggle; display: inline-flex; }
  .quick-rail {
    grid-area: quick;
    justify-self: stretch;
    overflow-x: auto;
    padding-bottom: 0.1rem;
    scrollbar-width: none;
  }
  .quick-rail::-webkit-scrollbar { display: none; }
  .quick-rail__label { display: none; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 80;
    display: block;
    max-height: 80vh;
    overflow-y: auto;
    padding: 1rem 1.25rem calc(1.25rem + env(safe-area-inset-bottom, 0px));
    background: var(--paper);
    border-top: var(--line);
    box-shadow: 0 -6px 0 -2px rgba(95, 87, 77, 0.2);
    transform: translateY(102%);
    visibility: hidden;
    transition: transform 0.3s cubic-bezier(0.22, 0.61, 0.36, 1), visibility 0.3s;
  }
  .site-nav[data-open] {
    transform: translateY(0);
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    counter-reset: navi;
  }
  .nav-list li {
    counter-increment: navi;
    border-bottom: 1px solid var(--warm-gray);
  }
  .nav-list li:first-child { border-top: 1px solid var(--warm-gray); }
  .nav-list a {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    padding: 0.8rem 0.2rem;
    font-size: 1rem;
  }
  .nav-list a::before {
    content: counter(navi, decimal-leading-zero);
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    color: var(--terracotta);
  }
  .nav-list a::after { display: none; }
  .nav-list a[aria-current="page"] {
    padding-left: 0.7rem;
    background: var(--paper-deep);
    box-shadow: inset 3px 0 0 0 var(--terracotta);
  }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 70;
    background: rgba(33, 31, 28, 0.45);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s;
  }
  .nav-scrim[data-open] {
    opacity: 1;
    visibility: visible;
  }

  body.nav-locked { overflow: hidden; }
}

@media (max-width: 899px) {
  .grid--2,
  .grid--3,
  .split { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 860px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 760px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-scale {
    grid-column: 1;
    grid-row: auto;
    width: 96px;
  }
  .footer-bottom-inner { flex-direction: column; align-items: flex-start; }
  .media-frame { box-shadow: 4px 4px 0 0 rgba(95, 87, 77, 0.22); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}