/* ===== 01. Reset ===== */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5,
p, ul, ol, figure, blockquote, dl, dd { margin: 0; }

ul, ol { padding: 0; list-style: none; }

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

a { color: inherit; text-decoration: none; }

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

input, textarea, select { font: inherit; }

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

/* ===== 02. Tokens ===== */
:root {
  --clay: #8A3B2B;
  --clay-deep: #552019;
  --clay-deepest: #41160F;
  --peacock: #0E5A66;
  --peacock-light: #2C8591;
  --gold: #C29555;
  --gold-soft: #E8CFA3;
  --paper: #F2E6D4;
  --paper-deep: #E7D7BF;
  --cream: #FBF6EE;
  --ink: #211B17;
  --shard: #B7A697;
  --brown: #6B4A3A;
  --line: rgba(183, 166, 151, 0.55);
  --line-strong: rgba(107, 74, 58, 0.35);
  --shadow-1: 0 1px 0 rgba(85, 32, 25, 0.06), 0 10px 26px -20px rgba(85, 32, 25, 0.75);
  --shadow-2: 0 20px 44px -32px rgba(85, 32, 25, 0.9);
  --radius: 3px;
  --radius-lg: 6px;
  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "Consolas", "Courier New", monospace;
  --shell: 1360px;
  --gutter: clamp(18px, 4vw, 56px);
  --section-y: clamp(52px, 7vw, 104px);
  --ease: 160ms ease;
}

/* ===== 03. Base typography ===== */
body {
  font-family: var(--font-body);
  font-size: clamp(15px, 1.02vw, 17px);
  line-height: 1.78;
  color: var(--ink);
  background-color: var(--paper);
  background-image: repeating-linear-gradient(
    0deg,
    rgba(183, 166, 151, 0.08) 0 1px,
    transparent 1px 88px
  );
  min-height: 100vh;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: 0.02em;
  color: var(--clay-deep);
}

h1 { font-size: clamp(2.1rem, 4.6vw, 4rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }
h4 { font-size: 1.06rem; }

p { max-width: 72ch; }

strong { color: var(--clay-deep); }

::selection { background: var(--gold-soft); color: var(--clay-deepest); }

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

#main-content { scroll-margin-top: 96px; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ===== 04. Skip link ===== */
.skip-link {
  position: absolute;
  left: 16px;
  top: -120px;
  z-index: 240;
  padding: 10px 18px;
  background: var(--cream);
  color: var(--clay-deep);
  border: 1px solid var(--gold);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  box-shadow: var(--shadow-2);
  transition: top var(--ease);
}

.skip-link:focus {
  top: 10px;
}

/* ===== 05. Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  box-shadow: inset 0 -1px 0 rgba(251, 246, 238, 0.8);
}

.site-header__inner {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 12px var(--gutter);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(18px, 3vw, 48px);
}

.site-header__brand-zone {
  display: flex;
  align-items: center;
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
}

.brand__seal {
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  background: var(--clay);
  color: var(--cream);
  font-family: var(--font-display);
  font-size: 1.24rem;
  line-height: 1;
  border-radius: 2px;
  box-shadow: inset 0 0 0 1px rgba(251, 246, 238, 0.34), 0 3px 12px -8px rgba(85, 32, 25, 0.95);
}

.brand__text {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.08rem;
  letter-spacing: 0.07em;
  color: var(--clay-deep);
}

.brand__line {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--brown);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  grid-column: 2;
  justify-self: end;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 8px 14px;
  background: var(--cream);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--clay-deep);
  cursor: pointer;
  transition: background-color var(--ease), border-color var(--ease), color var(--ease);
}

.nav-toggle:hover {
  background: var(--gold-soft);
  border-color: var(--gold);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: var(--clay);
  border-radius: 2px;
  transition: transform var(--ease), opacity var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }

.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.site-header__nav-zone {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(12px, 2vw, 28px);
  min-width: 0;
}

.site-nav { min-width: 0; }

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(2px, 0.5vw, 8px);
}

.site-nav__item { display: block; }

.site-nav__link {
  display: grid;
  gap: 1px;
  padding: 7px 9px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  color: var(--ink);
  transition: background-color var(--ease), border-color var(--ease), color var(--ease), transform var(--ease);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--brown);
  transition: color var(--ease);
}

.site-nav__label {
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
  background: rgba(14, 90, 102, 0.07);
  border-color: rgba(44, 133, 145, 0.42);
  color: var(--peacock);
  transform: translateY(-1px);
}

.site-nav__link:hover .site-nav__num,
.site-nav__link:focus-visible .site-nav__num { color: var(--peacock-light); }

.site-nav__link[aria-current="page"] {
  background: var(--clay);
  border-color: var(--clay-deep);
  color: var(--cream);
}

.site-nav__link[aria-current="page"] .site-nav__num { color: var(--gold-soft); }

.header-tools {
  display: grid;
  gap: 3px;
  padding-left: clamp(12px, 1.6vw, 22px);
  border-left: 1px solid var(--line);
}

.header-tools__hint {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--brown);
  max-width: none;
}

.header-tools__k {
  color: var(--peacock);
  font-weight: 600;
}

.header-tools__entry {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--peacock);
  border-bottom: 1px dashed rgba(14, 90, 102, 0.45);
  padding-bottom: 1px;
  justify-self: start;
  transition: color var(--ease), border-color var(--ease);
}

.header-tools__entry:hover,
.header-tools__entry:focus-visible {
  color: var(--clay);
  border-bottom-color: var(--clay);
  border-bottom-style: solid;
}

.header-tools__hours {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--brown);
  max-width: none;
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--clay) 0%, var(--gold) 55%, var(--peacock) 100%);
  transition: transform 100ms linear;
}

/* ===== 06. Footer ===== */
.site-footer {
  position: relative;
  margin-top: var(--section-y);
  background: linear-gradient(180deg, var(--clay-deep) 0%, var(--clay-deepest) 100%);
  color: var(--cream);
}

.site-footer::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--clay) 0%, var(--gold) 50%, var(--peacock) 100%);
}

.site-footer__inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 76px) var(--gutter) clamp(24px, 3vw, 36px);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1.1fr) minmax(0, 0.85fr);
  gap: clamp(24px, 4vw, 56px);
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 2.4vw, 1.8rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cream);
}

.footer-brand__line {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold-soft);
}

.footer-brand__summary {
  margin-top: 14px;
  font-size: 0.95rem;
  line-height: 1.85;
  color: rgba(251, 246, 238, 0.82);
  max-width: 34ch;
}

.footer-brand__meta {
  margin-top: 16px;
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid rgba(232, 207, 163, 0.4);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--gold-soft);
}

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

.footer-block__title {
  padding-bottom: 8px;
  margin-bottom: 12px;
  border-bottom: 1px solid rgba(251, 246, 238, 0.18);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--gold-soft);
}

.footer-contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 10px;
  padding: 8px 0;
  border-bottom: 1px dashed rgba(251, 246, 238, 0.16);
  max-width: none;
}

.footer-contact__row--plain { border-bottom: 0; }

.footer-contact__label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: rgba(232, 207, 163, 0.86);
}

.footer-contact__value {
  flex: 1 1 auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--cream);
  word-break: break-word;
}

.copy-btn {
  flex: 0 0 auto;
  padding: 3px 9px;
  border: 1px solid rgba(232, 207, 163, 0.5);
  border-radius: 2px;
  background: transparent;
  color: var(--gold-soft);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}

.copy-btn:hover,
.copy-btn:focus-visible {
  background: rgba(232, 207, 163, 0.16);
  border-color: var(--gold-soft);
  color: var(--cream);
}

.copy-status {
  min-height: 1.2em;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--gold-soft);
  max-width: none;
}

.footer-index__list {
  display: grid;
  gap: 2px;
}

.footer-link {
  display: inline-block;
  padding: 5px 0;
  font-size: 0.92rem;
  color: rgba(251, 246, 238, 0.84);
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: rgba(232, 207, 163, 0.6);
}

.site-footer__base {
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 18px;
  border-top: 1px solid rgba(251, 246, 238, 0.16);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(251, 246, 238, 0.62);
}

.site-footer__copyright,
.site-footer__icp { max-width: none; }

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.site-footer__legal-link {
  color: rgba(251, 246, 238, 0.84);
  border-bottom: 1px solid rgba(232, 207, 163, 0.35);
  transition: color var(--ease), border-color var(--ease);
}

.site-footer__legal-link:hover,
.site-footer__legal-link:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

/* ===== 07. Shared layout ===== */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.stack {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(20px, 4vw, 60px);
  align-items: start;
}

.split--wide-left {
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
}

.prose {
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.88;
  color: var(--ink);
}

.prose p + p { margin-top: 1em; }

.prose ul,
.prose ol {
  margin-top: 0.8em;
  display: grid;
  gap: 0.5em;
  padding-left: 1.1em;
  list-style: disc;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--peacock);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--gold);
}

.section-title { font-size: clamp(1.6rem, 3vw, 2.5rem); }

.lede {
  max-width: 60ch;
  font-size: clamp(1rem, 1.35vw, 1.12rem);
  line-height: 1.92;
  color: var(--brown);
}

/* ===== 08. Buttons & tags ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.94rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color var(--ease), color var(--ease), border-color var(--ease), transform var(--ease), box-shadow var(--ease);
}

.btn--primary {
  background: var(--clay);
  border-color: var(--clay-deep);
  color: var(--cream);
  box-shadow: var(--shadow-1);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--clay-deep);
  transform: translateY(-1px);
  box-shadow: var(--shadow-2);
}

.btn--ghost {
  background: transparent;
  border-color: rgba(14, 90, 102, 0.45);
  color: var(--peacock);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: rgba(14, 90, 102, 0.08);
  border-color: var(--peacock);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  line-height: 1.7;
}

.tag--gold {
  background: var(--gold-soft);
  border-color: rgba(194, 149, 85, 0.5);
  color: #3E2A1C;
}

.tag--peacock {
  background: rgba(14, 90, 102, 0.1);
  border-color: rgba(14, 90, 102, 0.3);
  color: var(--peacock);
}

/* ===== 09. Console panel ===== */
.panel {
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: rgba(242, 230, 212, 0.55);
}

.panel__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--clay-deep);
}

.panel__meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--brown);
}

.panel__body {
  display: grid;
  gap: 14px;
  padding: 18px;
}

/* ===== 10. Index cards ===== */
.index-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(232px, 1fr));
  gap: clamp(10px, 1.4vw, 18px);
}

.index-card {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 18px 18px 20px;
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.index-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--gold);
  opacity: 0;
  transition: opacity var(--ease);
}

.index-card:hover,
.index-card:focus-within {
  transform: translateY(-2px);
  border-color: rgba(14, 90, 102, 0.45);
  box-shadow: var(--shadow-1);
}

.index-card:hover::before,
.index-card:focus-within::before { opacity: 1; }

.index-card__num {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.index-card__title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--clay-deep);
}

.index-card__meta {
  font-size: 0.86rem;
  line-height: 1.72;
  color: var(--brown);
}

/* ===== 11. Rule list ===== */
.rule-list {
  display: grid;
  border-top: 1px solid var(--line);
}

.rule-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2vw, 28px);
  padding: clamp(16px, 2.2vw, 26px) 0;
  border-bottom: 1px solid var(--line);
}

.rule-item__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 2.4vw, 2rem);
  line-height: 1;
  color: var(--gold);
}

.rule-item__body {
  display: grid;
  gap: 6px;
  max-width: 70ch;
}

.rule-item__note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--brown);
}

/* ===== 12. Image frames ===== */
.media-frame {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--paper-deep);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame--clay {
  background-color: var(--clay);
  background-image: repeating-linear-gradient(
    135deg,
    rgba(251, 246, 238, 0.11) 0 2px,
    transparent 2px 13px
  );
}

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.96) contrast(1.02);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  background: linear-gradient(180deg, transparent, rgba(65, 22, 15, 0.8));
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--cream);
}

/* ===== 13. Breadcrumbs ===== */
.breadcrumbs { padding-block: 14px 0; }

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

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

.breadcrumbs__link {
  color: var(--peacock);
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease), color var(--ease);
}

.breadcrumbs__link:hover,
.breadcrumbs__link:focus-visible {
  color: var(--peacock-light);
  border-bottom-color: var(--peacock-light);
}

.breadcrumbs__sep { color: var(--shard); }

.breadcrumbs__current { color: var(--brown); }

/* ===== 14. Folding ===== */
.fold {
  background: var(--cream);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.fold + .fold { margin-top: -1px; }

.fold__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  cursor: pointer;
  font-weight: 600;
  color: var(--clay-deep);
  list-style: none;
}

.fold__summary::-webkit-details-marker { display: none; }

.fold__summary::before {
  content: "＋";
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
  color: var(--gold);
}

.fold[open] .fold__summary::before {
  content: "－";
  color: var(--peacock);
}

.fold__body {
  padding: 0 18px 16px;
  max-width: 70ch;
  line-height: 1.86;
  color: var(--brown);
}

/* ===== 15. Spy link state ===== */
[data-spy-link][aria-current="location"] {
  color: var(--clay);
  font-weight: 600;
}

/* ===== 16. Responsive ===== */
@media (max-width: 1080px) {
  .site-header__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    row-gap: 0;
  }

  .nav-toggle { display: inline-flex; }

  .site-header__nav-zone {
    display: none;
    grid-column: 1 / -1;
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    margin-top: 12px;
    padding-top: 14px;
    border-top: 1px solid var(--line);
  }

  .site-header[data-open] .site-header__nav-zone { display: flex; }

  .site-nav__list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }

  .site-nav__link {
    display: flex;
    align-items: baseline;
    gap: 8px;
    padding: 10px;
    background: rgba(251, 246, 238, 0.72);
    border-color: var(--line);
  }

  .header-tools {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 4px 14px;
    align-items: baseline;
    padding-left: 0;
    padding-top: 12px;
    border-left: 0;
    border-top: 1px solid var(--line);
  }

  .header-tools__entry { justify-self: start; }

  .site-footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-brand { grid-column: 1 / -1; }

  .split,
  .split--wide-left {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 620px) {
  .site-nav__list { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .header-tools { grid-template-columns: minmax(0, 1fr); }

  .brand__line { display: none; }

  .site-footer__grid { grid-template-columns: minmax(0, 1fr); }

  .site-footer__base {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .index-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 420px) {
  .brand__seal { flex-basis: 36px; width: 36px; height: 36px; font-size: 1.06rem; }
  .site-nav__link { padding: 8px; }
}

/* ===== 17. Motion preferences ===== */
@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;
  }

  .scroll-progress__bar { transition: none; }
  .index-card:hover,
  .index-card:focus-within,
  .site-nav__link:hover,
  .btn--primary:hover { transform: none; }
}