:root {
  --color-surface: #f8f8f8;
  --color-surface-alt: #eeeeee;
  --color-surface-deep: #e0e0e0;
  --color-ink: #34302d;
  --color-ink-soft: #645e58;
  --color-ink-muted: #7e7771;
  --color-line: #d5d4d3;
  --color-primary: #b55c0c;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #efe2d7;
  --color-accent: #247bb2;
  --color-accent-ink: #ffffff;
  --color-highlight: #d2e2eb;
  --color-focus: #1775b0;
  --color-contrast-surface: #1f160e;
  --color-contrast-ink: #e7e5e4;
  --color-contrast-line: #4b443d;
  --color-contrast-accent: #2b93d4;
  --overlay-scrim: linear-gradient(180deg, rgba(31, 22, 14, 0.35) 0%, rgba(31, 22, 14, 0.72) 55%, rgba(31, 22, 14, 0.92) 100%);
  --font-heading: "Source Han Sans SC", "Noto Sans SC", SimHei, "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 10.4px;
  --text-sm: 13.9px;
  --text-base: 16px;
  --text-lg: 21.3px;
  --text-xl: 28.4px;
  --text-2xl: 37.9px;
  --text-3xl: 50.5px;
  --text-4xl: 67.3px;
  --text-display: clamp(52px, 10.7vw, 137px);
  --text-figure: clamp(44px, 7.7vw, 99px);
  --weight-heading: 807;
  --weight-body: 400;
  --leading-body: 1.65;
  --leading-heading: 1.18;
  --tracking-heading: -0.01em;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 7px;
  --radius-pill: 7px;
  --border-thin: 2px;
  --border-thick: 2px;
  --shadow-1: 4px 4px 0 #34302d;
  --shadow-2: 8px 8px 0 #34302d;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1180px;
  --measure: 73ch;
  --gutter: 24px;
  --section-y: 92px;
  --section-y-lg: 129px;
}

/* ========== 1. reset & base ========== */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  font-weight: var(--weight-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body[data-nav-open] { overflow: hidden; }

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p { margin: 0 0 var(--space-2); }

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

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

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

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

time, .num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

::selection { background: var(--color-primary); color: var(--color-primary-ink); }

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

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -80px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  transition: top .16s ease;
}
.skip-link:focus { top: var(--space-2); }

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

/* ========== 2. layout ========== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid {
  display: grid;
  gap: var(--space-3);
}

.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); }
.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-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

.stack { display: flex; flex-direction: column; gap: var(--space-2); }
.row { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-6); }
.section--alt { background: var(--color-surface-alt); }
.section--deep { background: var(--color-contrast-surface); color: var(--color-contrast-ink); }
.section--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.section--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.section--deep .num, .section--deep a { color: var(--color-contrast-accent); }
.section--deep h2, .section--deep h3 { color: var(--color-contrast-ink); }

.slant-top { clip-path: polygon(0 48px, 100% 0, 100% 100%, 0 100%); }
.slant-bottom { clip-path: polygon(0 0, 100% 0, 100% calc(100% - 48px), 0 100%); }
.slant-both { clip-path: polygon(0 48px, 100% 0, 100% calc(100% - 48px), 0 100%); }
.slant-top, .slant-bottom, .slant-both { padding-block: var(--section-y-lg); }

/* ========== 3. header ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--color-surface);
  border-bottom: var(--border-thick) solid var(--color-ink);
  transition: box-shadow .18s ease;
}
.site-header.is-stuck { box-shadow: 0 4px 0 rgba(52, 48, 45, .16); }

.header-rail {
  max-width: var(--container);
  margin-inline: auto;
  padding: 0 var(--gutter);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-3);
  min-height: 74px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding-block: 6px;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-1);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 24% 100%, 0 76%);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}
.brand__season {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .14em;
  color: var(--color-ink-muted);
}

.site-nav__list {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-1);
}
.site-nav__link {
  display: inline-flex;
  align-items: center;
  padding: 9px 14px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: .01em;
  color: var(--color-ink-soft);
  background: var(--color-surface-alt);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  transition: background-color .16s ease, color .16s ease, border-color .16s ease, transform .16s ease;
}
.site-nav__link:hover {
  background: var(--color-primary-soft);
  color: var(--color-ink);
  transform: translateY(-2px);
}
.site-nav__link[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-ink);
}

.header-actions { display: flex; align-items: center; gap: var(--space-2); }

.refresh-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 10px;
  background: var(--color-surface-deep);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .12em;
  color: var(--color-ink-soft);
}
.refresh-chip__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-accent) 22%, transparent);
  animation: breathe 2.6s ease-in-out infinite;
}
@keyframes breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: .42; }
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 12px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
}
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 3px; width: 16px; }
.nav-toggle__bars span { display: block; height: 2px; background: currentColor; transition: transform .16s ease; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(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(-5px) rotate(-45deg); }

.header-strip {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}
.header-strip__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: 7px var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}
.league-strip { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); }
.header-strip__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

/* ========== 4. buttons & tags ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px 20px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: .02em;
  line-height: 1.2;
  background: var(--color-surface);
  color: var(--color-ink);
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  transition: transform .16s ease, box-shadow .16s ease, background-color .16s ease;
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: var(--shadow-2); }
.btn:active { transform: translate(2px, 2px); box-shadow: none; }
.btn--primary { background: var(--color-primary); color: var(--color-primary-ink); }
.btn--accent { background: var(--color-accent); color: var(--color-accent-ink); }
.btn--deep {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
  box-shadow: 4px 4px 0 var(--color-contrast-line);
}
.btn--sm { padding: 8px 14px; font-size: var(--text-sm); }
.btn--lg { padding: 16px 28px; font-size: var(--text-lg); }
.btn--block { width: 100%; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 12px 3px 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-xs);
  letter-spacing: .12em;
  line-height: 1.7;
  background: var(--color-primary-soft);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  clip-path: polygon(0 0, 100% 0, 100% 62%, 84% 100%, 0 100%);
}
.tag--accent { background: var(--color-highlight); color: var(--color-accent); }
.tag--deep {
  background: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent);
  color: var(--color-contrast-ink);
}
.tag--deep.tag--accent {
  background: color-mix(in srgb, var(--color-contrast-accent) 22%, transparent);
  color: var(--color-contrast-accent);
}

/* ========== 5. separators, chapters, stats ========== */
.rule-scale {
  position: relative;
  height: 16px;
  border-top: var(--border-thin) solid var(--color-line);
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 2px, transparent 2px 18px);
  background-repeat: repeat-x;
  background-size: 100% 7px;
}
.rule-scale--deep { border-top-color: var(--color-contrast-line); background-image: repeating-linear-gradient(90deg, var(--color-contrast-line) 0 2px, transparent 2px 18px); }

.chapter { display: flex; flex-direction: column; gap: var(--space-1); }
.chapter__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-2xl);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--color-primary);
}
.chapter__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .18em;
  color: var(--color-ink-muted);
}
.chapter__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  letter-spacing: var(--tracking-heading);
  margin: 0;
}
.chapter__body { color: var(--color-ink-soft); max-width: var(--measure); }

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: var(--text-figure);
  line-height: .92;
  letter-spacing: -.04em;
  color: var(--color-primary);
}
.stat__value--accent { color: var(--color-accent); }
.stat--sm .stat__value { font-size: var(--text-2xl); line-height: 1.05; }
.stat__unit {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  letter-spacing: .06em;
}
.stat__label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: .08em;
  color: var(--color-ink-soft);
}
.display {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: .92;
  letter-spacing: -.03em;
  margin: 0;
}
.section--deep .chapter__num { color: var(--color-contrast-accent); }
.section--deep .chapter__body,
.section--deep .stat__label { color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent); }
.section--deep .stat__value { color: var(--color-contrast-accent); }
.section--deep .stat__unit { color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent); }

/* ========== 6. panels, cards, figures ========== */
.panel {
  position: relative;
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.panel--alt { background: var(--color-surface-alt); }
.panel--deep {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
  box-shadow: 4px 4px 0 var(--color-contrast-line);
}
.panel--lift { transition: transform .16s ease, box-shadow .16s ease, background-color .16s ease; }
.panel--lift:hover { transform: translate(-3px, -3px); box-shadow: var(--shadow-2); }
.panel--cut::after {
  content: "";
  position: absolute;
  right: -2px;
  bottom: -2px;
  width: 22px;
  height: 22px;
  background: var(--cut-bg, var(--color-surface));
  clip-path: polygon(100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.data-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-sm);
  transition: background-color .16s ease, border-color .16s ease;
}
.data-card:hover { background: var(--color-primary-soft); border-left-color: var(--color-accent); }

.figure { margin: 0; display: flex; flex-direction: column; gap: var(--space-2); }
.figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--color-surface-deep);
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.figure__media img,
.figure__img { width: 100%; height: 100%; object-fit: cover; display: block; }
.figure--wide .figure__media { aspect-ratio: 16 / 9; }
.figure--tall .figure__media { aspect-ratio: 3 / 4; }
.figure--square .figure__media { aspect-ratio: 1 / 1; }
.figure__overlay { position: absolute; inset: 0; background: var(--overlay-scrim); }
.figure__tag { position: absolute; left: 12px; bottom: 12px; z-index: 2; }
.figure__cap { font-size: var(--text-sm); line-height: 1.55; color: var(--color-ink-muted); }

/* ========== 7. breadcrumb, toc, links, prose ========== */
.breadcrumb { padding-block: var(--space-3) var(--space-1); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .12em;
  color: var(--color-ink-muted);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: var(--space-1); }
.breadcrumb__item:not(:last-child)::after { content: "/"; color: color-mix(in srgb, var(--color-ink-muted) 55%, transparent); }
.breadcrumb__link { color: var(--color-ink-soft); }
.breadcrumb__link:hover { color: var(--color-primary); }

.toc { display: flex; flex-direction: column; gap: 2px; }
.toc__link {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  padding: 9px 12px;
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  transition: background-color .16s ease, border-color .16s ease, color .16s ease;
}
.toc__link:hover { background: var(--color-surface-alt); color: var(--color-ink); }
.toc__link[aria-current="true"] {
  background: var(--color-primary-soft);
  border-left-color: var(--color-primary);
  color: var(--color-ink);
  font-weight: 700;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-primary);
  border-bottom: var(--border-thin) solid currentColor;
  padding-bottom: 2px;
}
.link-arrow::after { content: "→"; transition: transform .16s ease; }
.link-arrow:hover::after { transform: translateX(4px); }
.section--deep .link-arrow { color: var(--color-contrast-accent); }

.prose { max-width: var(--measure); }
.prose p { margin-bottom: var(--space-2); }
.prose h2 { font-size: var(--text-2xl); margin-top: var(--space-6); }
.prose h3 { font-size: var(--text-xl); margin-top: var(--space-4); }
.prose ul, .prose ol { list-style: disc; padding-left: 1.2em; margin-bottom: var(--space-2); }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 6px; }
.prose strong { font-weight: 700; }

/* ========== 8. footer ========== */
.site-footer {
  background: var(--color-surface);
  color: var(--color-ink);
  border-top: var(--border-thin) solid var(--color-line);
}
.site-footer__top {
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  gap: var(--space-4) var(--space-6);
  align-items: start;
  padding-block: var(--space-6) var(--space-4);
}
.footer-brand { display: flex; align-items: center; gap: var(--space-2); }
.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  border-radius: var(--radius-sm);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 24% 100%, 0 76%);
}
.footer-brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
}
.footer-meta { display: flex; flex-wrap: wrap; gap: var(--space-2) var(--space-6); }
.footer-meta__item { display: flex; flex-direction: column; gap: 2px; min-width: 152px; }
.footer-meta__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .16em;
  color: var(--color-ink-muted);
}
.footer-meta__value { font-size: var(--text-sm); color: var(--color-ink); }
.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding-block: var(--space-3) var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}
.footer-copy {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .08em;
  color: var(--color-ink-muted);
}
.footer-links { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-2); }
.footer-link {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
  transition: color .16s ease, border-color .16s ease;
}
.footer-link:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.footer-links__tick { display: inline-block; width: 2px; height: 12px; background: var(--color-line); }

/* ========== 9. JS-created elements ========== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  z-index: 120;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}
.to-top {
  position: fixed;
  right: var(--gutter);
  bottom: var(--gutter);
  z-index: 100;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  box-shadow: 4px 4px 0 rgba(31, 22, 14, .3);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: var(--text-sm);
  opacity: 0;
  visibility: hidden;
  transition: opacity .18s ease, visibility .18s ease;
}
.to-top.is-visible { opacity: 1; visibility: visible; }

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .3s ease, transform .3s ease;
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ========== 10. responsive ========== */
@media (max-width: 1080px) {
  .header-rail { grid-template-columns: auto minmax(0, 1fr) auto; gap: var(--space-2); }
  .site-nav__link { padding: 8px 10px; }
}

@media (max-width: 1024px) {
  .col-3, .col-4, .col-5 { grid-column: span 6; }
  .col-7, .col-8, .col-9 { grid-column: span 12; }
  :root { --section-y: 72px; --section-y-lg: 96px; }
}

@media (max-width: 980px) {
  html { scroll-padding-top: 96px; }
  .header-rail { grid-template-columns: minmax(0, 1fr) auto; min-height: 64px; }
  .nav-toggle { display: inline-flex; }
  .header-cta { display: none; }
  .refresh-chip { display: none; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(88vw, 340px);
    z-index: 90;
    padding: 84px var(--space-3) var(--space-4);
    overflow-y: auto;
    background: var(--color-contrast-surface);
    color: var(--color-contrast-ink);
    border-left: var(--border-thick) solid var(--color-ink);
    transform: translateX(102%);
    transition: transform .22s ease;
  }
  .site-nav[data-open] { transform: none; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: var(--space-1); }
  .site-nav__link {
    justify-content: flex-start;
    width: 100%;
    padding: 14px 16px;
    font-size: var(--text-lg);
    background: transparent;
    color: var(--color-contrast-ink);
    border: var(--border-thin) solid var(--color-contrast-line);
    border-radius: var(--radius-sm);
  }
  .site-nav__link:hover {
    background: color-mix(in srgb, var(--color-contrast-accent) 18%, transparent);
    color: var(--color-contrast-ink);
    transform: translateX(4px);
  }
  .site-nav__link[aria-current="page"] {
    background: var(--color-primary);
    color: var(--color-primary-ink);
    border-color: var(--color-primary);
  }
  .site-footer__top { grid-template-columns: 1fr; }
  .site-footer__bottom { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 760px) {
  .header-strip { display: none; }
  .brand__season { display: none; }
  .footer-meta__item { min-width: 132px; }
}

@media (max-width: 640px) {
  :root { --section-y: 56px; --section-y-lg: 72px; --gutter: 18px; }
  .col-3, .col-4, .col-5, .col-6 { grid-column: span 12; }
  .btn { width: 100%; }
  .btn--sm { width: auto; }
  .to-top { right: var(--space-2); bottom: var(--space-2); }
  .slant-top, .slant-bottom, .slant-both { clip-path: none; padding-block: var(--section-y); }
}

/* ========== 11. motion & accessibility ========== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .btn:hover, .panel--lift:hover, .site-nav__link:hover { transform: none; }
}