:root {
  --color-surface: #f7f7f6;
  --color-surface-alt: #f0efee;
  --color-surface-deep: #e6e4e3;
  --color-ink: #675c56;
  --color-ink-soft: #796e67;
  --color-ink-muted: #887d77;
  --color-line: #dddbd9;
  --color-primary: #956d56;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e9e4e0;
  --color-accent: #bf404a;
  --color-accent-ink: #ffffff;
  --color-highlight: #edd6d7;
  --color-focus: #cc333f;
  --color-contrast-surface: #1d1916;
  --color-contrast-ink: #e7e5e4;
  --color-contrast-line: #494643;
  --color-contrast-accent: #ca626a;
  --overlay-scrim: linear-gradient(180deg, rgba(29, 25, 22, 0.35) 0%, rgba(29, 25, 22, 0.72) 55%, rgba(29, 25, 22, 0.92) 100%);
  --font-heading: "Songti SC", STSong, "Source Han Serif SC", SimSun, serif;
  --font-body: "Songti SC", STSong, "Source Han Serif SC", SimSun, serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 11.4px;
  --text-sm: 14.3px;
  --text-base: 16px;
  --text-lg: 20.0px;
  --text-xl: 25.0px;
  --text-2xl: 31.2px;
  --text-3xl: 39.1px;
  --text-4xl: 48.8px;
  --text-display: clamp(39px, 8.0vw, 102px);
  --text-figure: clamp(32px, 5.7vw, 73px);
  --weight-heading: 445;
  --weight-body: 400;
  --leading-body: 1.94;
  --leading-heading: 1.19;
  --tracking-heading: 0.022em;
  --radius-sm: 1px;
  --radius-md: 2px;
  --radius-lg: 2px;
  --radius-pill: 2px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1020px;
  --measure: 63ch;
  --gutter: 32px;
  --section-y: 139px;
  --section-y-lg: 195px;
}

/* ============ 基础重置 ============ */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  letter-spacing: 0.01em;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img, picture, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; }
table { border-collapse: collapse; width: 100%; }
figure { margin: 0; }

:focus-visible {
  outline: var(--border-thin) solid var(--color-focus);
  outline-offset: 3px;
}

/* ============ 容器与节奏 ============ */
.shell {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, var(--gutter));
}

.section { margin-block: var(--section-y); }
.section--first { margin-top: 0; }
.section--loose { margin-block: var(--section-y-lg); }
.section--tight { margin-block: var(--space-8); }

.divider {
  height: var(--border-thin);
  border: 0;
  margin: 0;
  background-color: var(--color-line);
}

.rule-thick {
  height: var(--border-thin);
  background-color: var(--color-contrast-surface);
}

.rule-double {
  height: 5px;
  border-top: var(--border-thin) solid var(--color-contrast-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

/* ============ 字体层级 ============ */
.hero-display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: 0.008em;
  color: var(--color-ink);
}

.figure-num {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--color-primary);
}

.page-title { font-size: var(--text-2xl); }
.section-title { font-size: var(--text-xl); }
.entry-title { font-size: var(--text-lg); }

.lede {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.eyebrow {
  display: inline-block;
  margin-bottom: var(--space-3);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  color: var(--color-primary);
}

.meta {
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.note {
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  line-height: 1.8;
  color: var(--color-ink-muted);
}

/* ============ 正文排版 ============ */
.prose { max-width: var(--measure); }
.prose p + p { margin-top: var(--space-3); }
.prose h2 { font-size: var(--text-xl); margin-top: var(--space-6); }
.prose h3 { font-size: var(--text-lg); margin-top: var(--space-4); }
.prose ul {
  margin-top: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.prose ul li {
  position: relative;
  padding-left: var(--space-3);
}
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.9em;
  width: 6px;
  height: var(--border-thin);
  background-color: var(--color-primary);
}
.prose a {
  border-bottom: var(--border-thin) solid var(--color-accent);
  transition: color 180ms ease, background-color 180ms ease;
}
.prose a:hover { color: var(--color-accent); background-color: var(--color-highlight); }

.pull-quote {
  max-width: var(--measure);
  margin: var(--space-6) 0;
  padding-left: var(--space-4);
  border-left: var(--border-thin) solid var(--color-accent);
  font-size: var(--text-lg);
  line-height: 1.8;
  color: var(--color-ink);
}
.pull-quote::before { content: "「"; color: var(--color-accent); }
.pull-quote::after { content: "」"; color: var(--color-accent); }

/* ============ 按钮与链接出口 ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 11px 20px;
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-sm);
  background-color: transparent;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  line-height: 1.4;
  cursor: pointer;
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease;
}
.btn:hover { background-color: var(--color-contrast-surface); color: var(--color-contrast-ink); }

.btn--accent { border-color: var(--color-accent); color: var(--color-accent); }
.btn--accent:hover { background-color: var(--color-accent); color: var(--color-accent-ink); }

.btn--ghost { border-color: var(--color-line); color: var(--color-ink-soft); }
.btn--ghost:hover {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
}

.text-link {
  border-bottom: var(--border-thin) solid var(--color-accent);
  color: var(--color-ink);
  transition: color 180ms ease, background-color 180ms ease;
}
.text-link:hover { color: var(--color-accent); background-color: var(--color-highlight); }

/* ============ 面包屑 ============ */
.breadcrumb { padding-block: var(--space-3); }
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}
.breadcrumb-list li + li::before {
  content: "／";
  margin-right: var(--space-2);
  color: var(--color-line);
}
.breadcrumb-list a:hover { color: var(--color-accent); }
.breadcrumb-list [aria-current="page"] { color: var(--color-ink); }

/* ============ 标签与展签 ============ */
.tag {
  display: inline-block;
  padding: 3px 9px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  line-height: 1.5;
  color: var(--color-ink-muted);
}
.tag--accent { border-color: var(--color-accent); color: var(--color-accent); }
.tag--primary {
  border-color: var(--color-primary);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

.plate {
  padding: var(--space-4);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-alt);
}
.plate--deep { background-color: var(--color-surface-deep); }

/* ============ 图像容器 ============ */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-deep);
}
.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: inherit;
}
.media-frame--scrim::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.media-frame .media-caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 1;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  line-height: 1.6;
}

.ratio-16x9 { aspect-ratio: 16 / 9; }
.ratio-3x2 { aspect-ratio: 3 / 2; }
.ratio-4x3 { aspect-ratio: 4 / 3; }
.ratio-1x1 { aspect-ratio: 1 / 1; }
.ratio-3x4 { aspect-ratio: 3 / 4; }

/* ============ 栅格 ============ */
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.grid--stack { gap: var(--space-6); }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

/* ============ 时间轴 ============ */
.timeline {
  display: flex;
  flex-direction: column;
  max-width: var(--measure);
}
.timeline-item {
  position: relative;
  padding: var(--space-4) 0 var(--space-4) var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}
.timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(var(--space-4) + 0.55em);
  width: 8px;
  height: 8px;
  border: var(--border-thin) solid var(--color-primary);
  border-radius: 50%;
  background-color: var(--color-surface);
}
.timeline-time {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-primary);
}

/* ============ 深色分节 ============ */
.band-contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  padding-block: var(--section-y);
}
.band-contrast h1,
.band-contrast h2,
.band-contrast h3 { color: var(--color-contrast-ink); }
.band-contrast p { color: color-mix(in srgb, var(--color-contrast-ink) 84%, transparent); }
.band-contrast .lede { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }
.band-contrast a { color: var(--color-contrast-accent); }
.band-contrast .eyebrow { color: var(--color-contrast-accent); }
.band-contrast .meta,
.band-contrast .note { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }
.band-contrast .note { border-left-color: var(--color-contrast-line); }
.band-contrast .divider,
.band-contrast .rule-double { border-color: var(--color-contrast-line); background-color: transparent; }
.band-contrast .divider { background-color: var(--color-contrast-line); }
.band-contrast .tag {
  border-color: var(--color-contrast-line);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}
.band-contrast .timeline-item { border-top-color: var(--color-contrast-line); }
.band-contrast .timeline-item::before {
  border-color: var(--color-contrast-accent);
  background-color: var(--color-contrast-surface);
}
.band-contrast .timeline-time { color: var(--color-contrast-accent); }
.band-contrast .btn {
  border-color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent);
  color: var(--color-contrast-ink);
}
.band-contrast .btn:hover {
  background-color: var(--color-contrast-ink);
  color: var(--color-contrast-surface);
}

/* ============ 问答 ============ */
.qa-list { border-top: var(--border-thin) solid var(--color-contrast-surface); }
.qa-item { border-bottom: var(--border-thin) solid var(--color-line); }
.qa-item > summary {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
  transition: color 180ms ease;
}
.qa-item > summary::-webkit-details-marker { display: none; }
.qa-item > summary::before {
  content: "问";
  flex: 0 0 auto;
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-primary);
}
.qa-item > summary:hover { color: var(--color-accent); }
.qa-item[open] > summary { color: var(--color-accent); }
.qa-item[open] > summary::before { color: var(--color-accent); }
.qa-body {
  max-width: var(--measure);
  padding: 0 0 var(--space-4) calc(var(--space-3) + 1.4em);
  color: var(--color-ink-soft);
}

/* ============ 章节索引 ============ */
.spy-nav {
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.spy-nav-title {
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  color: var(--color-ink-muted);
}
.spy-link {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  transition: color 180ms ease;
}
.spy-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 8px;
  height: var(--border-thin);
  background-color: var(--color-line);
  transition: width 180ms ease, background-color 180ms ease;
}
.spy-link:hover { color: var(--color-ink); }
.spy-link[aria-current="true"] { color: var(--color-accent); }
.spy-link[aria-current="true"]::before {
  width: 18px;
  background-color: var(--color-accent);
}

/* ============ 头部 ============ */
.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -120px;
  z-index: 90;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transition: top 180ms ease;
}
.skip-link:focus { top: var(--space-2); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.header-shell {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 68px;
  padding-block: var(--space-2);
}

.header-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 0 0 auto;
}
.brand-mark {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.14em;
  line-height: 1.2;
  color: var(--color-ink);
  transition: color 180ms ease;
}
.brand-mark:hover { color: var(--color-primary); }
.brand-note {
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  line-height: 1.5;
  color: var(--color-ink-muted);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}
.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.nav-item { display: block; }
.nav-link {
  position: relative;
  display: inline-block;
  padding-block: 6px;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--color-ink-soft);
  transition: color 200ms ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: var(--border-thin);
  background-color: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 200ms ease;
}
.nav-link:hover { color: var(--color-ink); }
.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--color-accent); }
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background-color: var(--color-accent);
}

.nav-aside { display: none; }

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 0 0 auto;
}
.contact-link {
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid var(--color-accent);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink);
  transition: color 180ms ease, background-color 180ms ease;
}
.contact-link:hover { color: var(--color-accent); background-color: var(--color-highlight); }

.nav-toggle {
  display: none;
  align-items: center;
  padding: 6px 12px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink-soft);
  cursor: pointer;
  transition: border-color 180ms ease, color 180ms ease;
}
.nav-toggle:hover { border-color: var(--color-primary); color: var(--color-ink); }
.nav-toggle-close { display: none; }
.nav-toggle[aria-expanded="true"] {
  border-color: var(--color-accent);
  color: var(--color-accent);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-open { display: none; }
.nav-toggle[aria-expanded="true"] .nav-toggle-close { display: inline; }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: var(--border-thin);
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 120ms linear;
}
.scroll-progress.is-static { transition: none; }

/* ============ 页脚 ============ */
.site-footer {
  margin-top: var(--section-y);
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
}

.footer-shell { padding-block: var(--space-8) var(--space-6); }

.footer-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
}
.footer-brand {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: 0.12em;
  line-height: 1.2;
  color: var(--color-ink);
  transition: color 180ms ease;
}
.footer-brand:hover { color: var(--color-primary); }
.footer-top-note {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.footer-index {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-col {
  padding: var(--space-4) var(--space-4) 0;
  border-left: var(--border-thin) solid var(--color-line);
}
.footer-col:first-child {
  padding-left: 0;
  border-left: 0;
}
.footer-col-title {
  margin-bottom: var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--weight-body);
  letter-spacing: 0.22em;
  color: var(--color-primary);
}
.footer-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.9;
  color: var(--color-ink-soft);
}
.footer-list a {
  border-bottom: var(--border-thin) solid transparent;
  transition: color 180ms ease, border-color 180ms ease;
}
.footer-list a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}
.footer-list--plain {
  font-size: var(--text-xs);
  line-height: 1.9;
  color: var(--color-ink-muted);
}
.footer-list--plain a { color: var(--color-ink-muted); }

.footer-base {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-fine {
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

/* ============ 响应式 ============ */
@media (max-width: 1000px) {
  .footer-index { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-col:nth-child(odd) {
    padding-left: 0;
    border-left: 0;
  }
  .footer-col:nth-child(n + 3) {
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: var(--border-thin) solid var(--color-line);
  }
  .col-3,
  .col-4 { grid-column: span 6; }
  .col-5,
  .col-7 { grid-column: span 12; }
}

@media (max-width: 860px) {
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-4) clamp(20px, 5vw, var(--gutter)) var(--space-6);
    background-color: var(--color-surface-alt);
    border-bottom: var(--border-thin) solid var(--color-contrast-surface);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition: opacity 180ms ease, transform 180ms ease, visibility 180ms linear;
  }
  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
    width: 100%;
  }
  .nav-link {
    font-size: var(--text-base);
    padding-block: var(--space-1);
    color: var(--color-ink);
  }
  .nav-aside {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    width: 100%;
    padding-top: var(--space-3);
    border-top: var(--border-thin) solid var(--color-line);
  }
  .nav-aside-link {
    align-self: flex-start;
    padding-bottom: 2px;
    border-bottom: var(--border-thin) solid var(--color-accent);
    font-size: var(--text-sm);
    letter-spacing: 0.08em;
    color: var(--color-accent);
  }
  .nav-aside-note {
    font-size: var(--text-xs);
    letter-spacing: 0.1em;
    color: var(--color-ink-muted);
  }
  .contact-link { display: none; }
  .nav-toggle { display: inline-flex; }

  .footer-index { grid-template-columns: 1fr; }
  .footer-col,
  .footer-col:nth-child(odd) {
    padding: var(--space-4) 0 0;
    border-left: 0;
  }
  .footer-col:nth-child(n + 2) {
    margin-top: 0;
    border-top: var(--border-thin) solid var(--color-line);
  }
  .footer-top { flex-direction: column; gap: var(--space-2); }
  .footer-base { flex-direction: column; gap: var(--space-2); }

  .grid { grid-template-columns: 1fr; }
  .col-3,
  .col-4,
  .col-5,
  .col-6,
  .col-7,
  .col-8,
  .col-12 { grid-column: auto; }

  .section { margin-block: calc(var(--section-y) * 0.5); }
  .section--loose { margin-block: calc(var(--section-y-lg) * 0.48); }
  .section--tight { margin-block: var(--space-6); }

  .band-contrast { padding-block: calc(var(--section-y) * 0.55); }
  .spy-nav { position: static; }
  .footer-shell { padding-block: var(--space-6) var(--space-4); }
}

@media (max-width: 560px) {
  .header-shell { flex-wrap: nowrap; }
  .brand-note { display: none; }
  .page-title { font-size: var(--text-xl); }
  .section-title { font-size: var(--text-lg); }
  .lede { font-size: var(--text-base); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}