:root {
  --bg-primary: #F7F1E8;
  --text-primary: #1E1A17;
  --text-secondary: #5A534C;
  --accent-orange: #FF5A36;
  --accent-blue: #1A3A5C;
  --accent-yellow: #FFD166;
  --border-muted: #E3D9CE;
  --surface-overlay: #FFFFFF;
  --badge-green: #2A9D8F;
  --ink-soft: #3A2E2A;
  --font-heading: "Noto Serif SC", "Playfair Display", "Songti SC", "SimSun", serif;
  --font-body: "Noto Sans SC", Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Space Mono", "SF Mono", Consolas, monospace;
  --container-w: 1200px;
  --gutter: clamp(16px, 3vw, 32px);
  --transition-timing: cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-paper: 0 1px 2px rgba(30, 26, 23, 0.04), 0 12px 36px rgba(30, 26, 23, 0.05);
}

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

html {
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  display: block;
}

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

p, figure, blockquote, dl, dd {
  margin: 0 0 1em;
}

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

input {
  font: inherit;
}

a {
  color: var(--accent-blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 200ms var(--transition-timing);
}

a:hover {
  color: var(--accent-orange);
}

h1, h2, h3 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.18;
  color: var(--text-primary);
  margin: 0 0 0.5em;
}

h1 {
  font-size: clamp(2.1rem, 4.5vw, 3.4rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
}

h3 {
  font-size: clamp(1.15rem, 1.8vw, 1.4rem);
}

h4, h5, h6 {
  font-family: var(--font-body);
  font-weight: 700;
  margin: 0 0 0.5em;
}

::selection {
  background: var(--accent-yellow);
  color: var(--text-primary);
}

:focus-visible {
  outline: 3px solid var(--accent-orange);
  outline-offset: 2px;
  border-radius: 2px;
}

#main-content {
  scroll-margin-top: 104px;
}

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

.section-pad {
  padding-block: clamp(48px, 7vw, 88px);
}

.content-container {
  max-width: 780px;
  margin-inline: auto;
  padding-block: clamp(36px, 5vw, 64px);
}

.double-border {
  border: 1px solid var(--border-muted);
  outline: 1px dashed rgba(227, 217, 206, 0.9);
  outline-offset: -7px;
  border-radius: 6px;
}

.highlight-mark {
  background: linear-gradient(transparent 62%, var(--accent-yellow) 62%);
  padding: 0 4px;
  font-style: inherit;
}

.notice {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 20px;
  background: #FFF7E0;
  border: 1px solid #EBCB77;
  border-radius: 6px;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-primary);
}

.notice__icon {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: #8A6A00;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background 250ms var(--transition-timing), border-color 250ms var(--transition-timing), color 250ms var(--transition-timing), transform 200ms var(--transition-timing);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--accent-orange);
  color: #FFFFFF;
}

.btn-primary:hover {
  background: #E64A28;
  color: #FFFFFF;
}

.btn-secondary {
  background: transparent;
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.btn-secondary:hover {
  background: var(--accent-blue);
  color: #FFFFFF;
}

.btn-ghost {
  background: transparent;
  border-color: var(--border-muted);
  color: var(--text-primary);
}

.btn-ghost:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.breadcrumbs {
  margin-bottom: 28px;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

.breadcrumbs__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
}

.breadcrumbs__item a {
  color: var(--text-secondary);
  text-decoration: none;
  background: var(--surface-overlay);
  border: 1px solid var(--border-muted);
  border-radius: 4px;
  padding: 4px 10px;
  transition: color 200ms var(--transition-timing), border-color 200ms var(--transition-timing);
}

.breadcrumbs__item a:hover {
  color: var(--accent-orange);
  border-color: var(--accent-orange);
}

.breadcrumbs__item:not(:last-child)::after {
  content: "→";
  color: var(--accent-orange);
  font-size: 0.65rem;
}

.breadcrumbs__item[aria-current="page"] {
  color: var(--accent-blue);
  font-weight: 600;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 201;
  background: var(--accent-blue);
  color: #FFFFFF;
  padding: 12px 20px;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 0 0 8px 8px;
  text-decoration: none;
  transition: top 300ms var(--transition-timing);
}

.skip-link:focus-visible {
  top: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-muted);
}

.header-strip {
  background: var(--accent-blue);
  color: var(--bg-primary);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  border-bottom: 3px solid var(--accent-orange);
}

.header-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 34px;
}

.header-strip__text {
  margin: 0;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.header-strip__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  color: var(--accent-yellow);
  font-size: 0.68rem;
  text-transform: uppercase;
}

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-block: 12px;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  flex-shrink: 0;
}

.brand-lockup:hover {
  color: var(--text-primary);
}

.brand-logo {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 2px;
  padding: 3px;
  width: 36px;
  height: 36px;
  background: var(--surface-overlay);
  border: 1px solid var(--border-muted);
  transform: rotate(-3deg);
  transition: transform 300ms var(--transition-timing);
  box-shadow: 0 2px 8px rgba(30, 26, 23, 0.06);
}

.brand-lockup:hover .brand-logo {
  transform: rotate(3deg) scale(1.04);
}

.brand-logo__cell {
  display: block;
  border-radius: 2px;
}

.brand-logo__cell--orange {
  background: var(--accent-orange);
}

.brand-logo__cell--blue {
  background: var(--accent-blue);
}

.brand-logo__cell--yellow {
  background: var(--accent-yellow);
}

.brand-logo__cell--ring {
  border: 2px solid var(--ink-soft);
  background: transparent;
}

.brand-type {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-meta {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  margin-top: 4px;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: var(--surface-overlay);
  border: 1px solid var(--border-muted);
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color 300ms var(--transition-timing), background 300ms var(--transition-timing);
  -webkit-appearance: none;
  appearance: none;
}

.nav-toggle:hover {
  border-color: var(--accent-orange);
  background: #FFFDF8;
}

.nav-toggle__box {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--text-primary);
  border-radius: 1px;
  transition: transform 300ms var(--transition-timing), opacity 200ms var(--transition-timing);
}

.nav-toggle__text {
  font-size: 0.8rem;
  letter-spacing: 0.04em;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  padding: 10px 9px;
  font-size: 0.93rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 220ms var(--transition-timing), border-color 220ms var(--transition-timing);
}

.nav-index {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 400;
  color: var(--accent-orange);
  letter-spacing: 0.02em;
}

.nav-label {
  line-height: 1.2;
}

.nav-link:hover {
  color: var(--accent-orange);
  border-bottom-color: var(--accent-orange);
}

.nav-link[aria-current="page"] {
  color: var(--accent-blue);
  border-bottom-color: var(--accent-blue);
}

.nav-search {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--surface-overlay);
  border: 1px solid var(--border-muted);
  border-radius: 999px;
  min-width: 200px;
  transition: border-color 200ms var(--transition-timing), box-shadow 200ms var(--transition-timing);
}

.nav-search:focus-within {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(26, 58, 92, 0.08);
}

.nav-search__icon {
  position: relative;
  width: 12px;
  height: 12px;
  border: 2px solid var(--text-secondary);
  border-radius: 50%;
  flex-shrink: 0;
}

.nav-search__icon::after {
  content: "";
  position: absolute;
  right: -4px;
  bottom: -3px;
  width: 2px;
  height: 6px;
  background: var(--text-secondary);
  transform: rotate(-45deg);
  border-radius: 1px;
}

.nav-search__input {
  width: 100%;
  min-width: 0;
  border: none;
  background: transparent;
  font-family: var(--font-body);
  font-size: 0.8rem;
  color: var(--text-primary);
  padding: 2px 0;
  outline: none;
}

.nav-search__input::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

.pulse-dot {
  position: relative;
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--badge-green);
}

.pulse-dot::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--badge-green);
  animation: pulse 2.2s var(--transition-timing) infinite;
}

@keyframes pulse {
  0% {
    transform: scale(1);
    opacity: 0.55;
  }
  70% {
    transform: scale(2.6);
    opacity: 0;
  }
  100% {
    transform: scale(2.6);
    opacity: 0;
  }
}

.site-footer {
  background: var(--ink-soft);
  color: #D7CFC6;
  border-top: 4px solid var(--accent-orange);
  margin-top: 96px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: clamp(32px, 5vw, 56px);
  padding-block: 64px 48px;
}

.footer-brand {
  min-width: 0;
}

.footer-brand__logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--bg-primary);
  margin-bottom: 18px;
}

.footer-brand__logo:hover {
  color: var(--accent-yellow);
}

.footer-brand__logo .brand-logo {
  width: 40px;
  height: 40px;
  transform: rotate(-3deg);
}

.footer-brand__name {
  font-family: var(--font-heading);
  font-size: 1.45rem;
  font-weight: 800;
}

.footer-brand__note {
  margin: 0;
  max-width: 36ch;
  font-size: 0.88rem;
  line-height: 1.9;
  color: #B6ADA5;
}

.footer-col {
  min-width: 0;
  padding-top: 16px;
  border-top: 2px solid var(--accent-orange);
}

.footer-col--contact {
  border-top-color: var(--accent-yellow);
}

.footer-col--legal {
  border-top-color: var(--accent-blue);
}

.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-yellow);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid rgba(231, 218, 206, 0.18);
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer-heading::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--accent-orange);
  transform: rotate(45deg);
  flex-shrink: 0;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  display: inline-block;
  color: #E3DBD2;
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 220ms var(--transition-timing), transform 220ms var(--transition-timing);
}

.footer-links a:hover {
  color: var(--accent-orange);
  transform: translateX(4px);
}

.footer-contact-list {
  list-style: none;
  font-size: 0.9rem;
  line-height: 2.1;
  color: #E3DBD2;
}

.footer-contact__note {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.9;
  color: #9C938A;
  max-width: 32ch;
}

.footer-bottom {
  border-top: 1px solid rgba(231, 218, 206, 0.14);
  padding-block: 18px;
}

.footer-bottom__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: #9C938A;
}

.footer-bottom__inner p {
  margin: 0;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-orange);
  margin-bottom: 18px;
}

.section-label::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--accent-orange);
  transform: rotate(45deg);
  flex-shrink: 0;
}

.chapter-number {
  margin: 0 0 6px;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(3rem, 8vw, 6.5rem);
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: var(--accent-blue);
  user-select: none;
}

@supports (-webkit-text-stroke: 1.5px var(--accent-blue)) {
  .chapter-number {
    -webkit-text-stroke: 1.5px var(--accent-blue);
    -webkit-text-fill-color: transparent;
  }
}

.tag-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border: 1px solid var(--border-muted);
  border-radius: 999px;
  background: var(--surface-overlay);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  white-space: nowrap;
}

.tag-label--orange {
  border-color: var(--accent-orange);
  color: var(--accent-orange);
  background: #FFF4EF;
}

.tag-label--blue {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
  background: #F0F4F8;
}

.tag-label--yellow {
  border-color: #EBCB77;
  color: #8A6A00;
  background: #FFF9E8;
}

.tag-label--green {
  border-color: var(--badge-green);
  color: var(--badge-green);
  background: #EEF7F5;
}

.paper-card {
  position: relative;
  background: var(--surface-overlay);
  border: 1px solid var(--border-muted);
  border-radius: 6px;
  box-shadow: var(--shadow-paper);
  padding: 28px;
}

.paper-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 26px;
  width: 52px;
  height: 8px;
  background: var(--accent-yellow);
  border-radius: 0 0 4px 4px;
}

.paper-card--orange::before {
  background: var(--accent-orange);
}

.paper-card--blue::before {
  background: var(--accent-blue);
}

.divider-flow {
  height: 10px;
  border: none;
  margin: 32px 0;
  opacity: 0.4;
  background: repeating-linear-gradient(-45deg, var(--accent-orange) 0 8px, transparent 8px 20px);
}

.grid-2col {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(24px, 3.5vw, 40px);
}

.grid-3col {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 36px);
}

.image-frame {
  position: relative;
  overflow: hidden;
  background: var(--surface-overlay);
  border: 1px solid var(--border-muted);
  border-radius: 4px;
  aspect-ratio: 4 / 3;
}

.image-frame--wide {
  aspect-ratio: 16 / 9;
}

.image-frame--square {
  aspect-ratio: 1 / 1;
}

.image-frame--portrait {
  aspect-ratio: 3 / 4;
}

.image-frame__placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.7;
  color: var(--text-secondary);
  background: linear-gradient(135deg, transparent 0 76%, rgba(26, 58, 92, 0.07) 76%), repeating-linear-gradient(-45deg, transparent 0 10px, rgba(90, 83, 76, 0.05) 10px 20px);
}

.image-frame > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cover-section {
  position: relative;
  padding-block: clamp(48px, 7vw, 100px);
  overflow: hidden;
}

.cover-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, 1fr);
  gap: clamp(44px, 6vw, 88px);
  align-items: center;
}

.cover-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.5rem, 6vw, 4.75rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
}

.cover-lede {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-secondary);
  max-width: 48ch;
  margin: 0 0 32px;
}

.cover-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.toc-card {
  position: relative;
  background: var(--surface-overlay);
  border: 1px solid var(--border-muted);
  border-radius: 6px;
  box-shadow: var(--shadow-paper);
  padding: 30px 28px 16px;
}

.toc-card::after {
  content: "";
  position: absolute;
  right: 18px;
  top: 18px;
  width: 22px;
  height: 22px;
  border: 5px solid var(--accent-yellow);
  border-radius: 50%;
  opacity: 0.8;
}

.toc-list {
  list-style: none;
  margin-top: 8px;
}

.toc-item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 13px 0;
  border-bottom: 1px dashed var(--border-muted);
}

.toc-item:last-child {
  border-bottom: none;
}

.toc-item__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-orange);
  min-width: 2em;
  flex-shrink: 0;
}

.toc-item a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: color 200ms var(--transition-timing);
}

.toc-item a:hover {
  color: var(--accent-orange);
}

.toc-item__meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.page-hero {
  padding-block: clamp(48px, 7vw, 84px) clamp(32px, 4vw, 52px);
}

.page-hero__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.1;
  margin-bottom: 14px;
}

.page-hero__lede {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--text-secondary);
  max-width: 62ch;
  margin: 0;
}

.deco-orbit {
  position: absolute;
  border-radius: 50%;
  border: 22px solid var(--accent-yellow);
  opacity: 0.5;
  pointer-events: none;
  width: 160px;
  height: 160px;
}

.deco-orbit--small {
  width: 84px;
  height: 84px;
  border-width: 12px;
}

.deco-orbit--blue {
  border-color: var(--accent-blue);
  opacity: 0.22;
}

.deco-dots {
  position: absolute;
  width: 56px;
  height: 56px;
  background-image: radial-gradient(var(--accent-orange) 1.5px, transparent 1.5px);
  background-size: 10px 10px;
  opacity: 0.25;
  pointer-events: none;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  z-index: 200;
  background: linear-gradient(90deg, var(--accent-orange), var(--accent-yellow));
  box-shadow: 0 1px 8px rgba(255, 90, 54, 0.35);
  pointer-events: none;
  transition: width 80ms linear;
}

@media (prefers-reduced-motion: no-preference) {
  [data-reveal] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 600ms var(--transition-timing), transform 600ms var(--transition-timing);
    transition-delay: calc(var(--reveal-delay, 0) * 1ms);
  }

  [data-reveal].is-revealed {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 1080px) {
  .nav-search {
    display: none;
  }

  .nav-link {
    font-size: 0.88rem;
    padding-inline: 7px;
  }

  .header-main {
    gap: 16px;
  }

  .site-nav {
    gap: 16px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 880px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    height: 100dvh;
    width: min(82vw, 380px);
    background: var(--bg-primary);
    border-left: 1px solid var(--border-muted);
    box-shadow: -18px 0 48px rgba(30, 26, 23, 0.16);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 20px;
    padding: 92px 28px 32px;
    overflow-y: auto;
    transform: translateX(105%);
    visibility: hidden;
    transition: transform 320ms var(--transition-timing), visibility 0s 320ms;
  }

  .site-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
    transition: transform 320ms var(--transition-timing), visibility 0s;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-item {
    border-bottom: 1px dashed var(--border-muted);
  }

  .nav-link {
    justify-content: space-between;
    padding: 15px 4px;
    font-size: 1.02rem;
    border-bottom: none;
  }

  .nav-link[aria-current="page"] {
    color: var(--accent-orange);
  }

  .nav-index {
    font-size: 0.7rem;
  }

  .nav-search {
    display: flex;
    margin-top: auto;
    min-width: 0;
  }

  .brand-meta {
    max-width: 42vw;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .header-strip__tag {
    display: none;
  }

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

  body:has(.site-nav[data-open]) {
    overflow: hidden;
  }
}

@media (max-width: 640px) {
  .brand-name {
    font-size: 1.1rem;
  }

  .brand-logo {
    width: 32px;
    height: 32px;
    padding: 2px;
  }

  .header-main {
    padding-block: 10px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-block: 48px 32px;
  }

  .footer-bottom__inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

@media (max-width: 560px) {
  .grid-2col,
  .grid-3col {
    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;
    scroll-behavior: auto !important;
  }

  .pulse-dot::after {
    animation: none;
  }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .scroll-progress {
    display: none;
  }
}