/* =========================================================
   K1体育 · 共享样式表 /assets/site.css
   炭黑底 + 珠宝色分区 + 荧光青/亮橙数据高亮
   ========================================================= */

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

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, dl, dd, hr {
  margin: 0;
}

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

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

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

button, input, select, textarea {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: 0;
  cursor: pointer;
}

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

hr { border: 0; }

/* ---------- tokens ---------- */
:root {
  --ink-charcoal: #0B0E0D;
  --pitch-deep: #10231C;
  --jewel-indigo: #1B2145;
  --wine-red: #4A1620;
  --brocade-red: #C0392B;
  --brocade-red-lite: #E86A55;
  --signal-cyan: #46E3C4;
  --alert-orange: #FF8A3D;
  --paper-white: #F2EFE7;
  --chalk-grey: #9AA9A3;
  --grid-line: #253832;

  --paper-88: rgba(242, 239, 231, .88);
  --paper-72: rgba(242, 239, 231, .72);
  --paper-55: rgba(242, 239, 231, .55);
  --paper-16: rgba(242, 239, 231, .16);

  --font-display: Oswald, "Bebas Neue", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "Roboto Mono", ui-monospace, "Courier New", monospace;

  --shell-max: 1280px;
  --gutter: clamp(1rem, 4vw, 3rem);

  --line: 1px solid var(--grid-line);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 160ms;
  --dur-slow: 240ms;

  --space-s: clamp(.75rem, 1.6vw, 1.15rem);
  --space-m: clamp(1.25rem, 3vw, 2.25rem);
  --space-l: clamp(2.5rem, 7vw, 5.5rem);
}

/* ---------- base ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-charcoal);
  background-image: radial-gradient(ellipse 120% 60% at 50% -12%, rgba(27, 33, 69, .55), transparent 65%);
  background-repeat: no-repeat;
  color: var(--paper-white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.06;
  color: var(--paper-white);
}

h1 { font-size: clamp(40px, 7vw, 96px); }
h2 { font-size: clamp(28px, 4.4vw, 48px); }
h3 { font-size: clamp(20px, 2.6vw, 32px); }
h4 { font-size: clamp(17px, 1.8vw, 21px); }

p { line-height: 1.75; }

strong { font-weight: 700; color: var(--paper-white); }

::selection {
  background: var(--signal-cyan);
  color: var(--ink-charcoal);
}

:focus-visible {
  outline: 2px solid var(--signal-cyan);
  outline-offset: 3px;
}

.num,
.stat__value,
.data-table td.num,
.data-table th.num,
.legal-line {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

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

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1rem, 2.2vw, 1.75rem);
}

.grid-12 > * { grid-column: span 12; }

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.page-main { display: block; }

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  left: 50%;
  top: .5rem;
  z-index: 200;
  padding: .6rem 1.1rem;
  transform: translate(-50%, -220%);
  background: var(--signal-cyan);
  color: var(--ink-charcoal);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { transform: translate(-50%, 0); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .62rem 1.1rem;
  border: 1px solid var(--grid-line);
  background: transparent;
  color: var(--paper-white);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.2;
  transition: transform var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

.btn:hover { transform: translateY(-1px); }

.btn--solid {
  background: var(--signal-cyan);
  border-color: var(--signal-cyan);
  color: var(--ink-charcoal);
}

.btn--solid:hover { background: #6df0d7; border-color: #6df0d7; }

.btn--outline {
  border-color: var(--alert-orange);
  color: var(--alert-orange);
}

.btn--outline:hover { background: rgba(255, 138, 61, .14); }

.btn--sm { padding: .42rem .8rem; font-size: 12.5px; }

/* ---------- masthead ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink-charcoal);
  border-bottom: 1px solid var(--grid-line);
}

.masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 12% -60%, rgba(70, 227, 196, .12), transparent 62%),
    radial-gradient(circle at 88% -60%, rgba(255, 138, 61, .10), transparent 62%);
}

.masthead__utility {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem 1rem;
  max-height: 64px;
  overflow: hidden;
  padding-block: .55rem;
  border-bottom: 1px solid var(--grid-line);
  transition: max-height var(--dur-slow) var(--ease),
              opacity var(--dur-slow) var(--ease),
              padding var(--dur-slow) var(--ease);
}

.masthead[data-shrunk] .masthead__utility {
  max-height: 0;
  opacity: 0;
  padding-block: 0;
  border-bottom-color: transparent;
}

.utility-links {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.15rem;
}

.utility-links__item {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  color: var(--chalk-grey);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.utility-links__item:hover {
  color: var(--paper-white);
  border-bottom-color: var(--brocade-red-lite);
}

.masthead__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

/* masthead frame */
.masthead__frame {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  padding-block: 1rem .9rem;
  transition: padding var(--dur-slow) var(--ease);
}

.masthead[data-shrunk] .masthead__frame { padding-block: .5rem .45rem; }

.brand {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .2rem;
  padding-inline: .5rem;
  text-align: center;
}

.brand::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -7px;
  width: 0;
  height: 2px;
  background: var(--signal-cyan);
  transform: translateX(-50%);
  transition: width var(--dur) var(--ease);
}

.brand:hover::after { width: min(100%, 170px); }

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(28px, 4.2vw, 44px);
  letter-spacing: -.01em;
  line-height: 1;
  color: var(--paper-white);
  transition: font-size var(--dur-slow) var(--ease);
}

.masthead[data-shrunk] .brand__name { font-size: clamp(20px, 2.6vw, 26px); }

.brand__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .24em;
  line-height: 1.4;
  color: var(--chalk-grey);
  transition: opacity var(--dur-slow) var(--ease);
}

.masthead[data-shrunk] .brand__sub { opacity: 0; }

/* season chips */
.season-chip {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .35rem .7rem;
  border: 1px solid var(--grid-line);
  background: rgba(16, 35, 28, .62);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  white-space: nowrap;
}

.season-chip--left { justify-self: start; }
.season-chip--right { justify-self: end; }

.season-chip__key {
  letter-spacing: .14em;
  color: var(--signal-cyan);
}

.season-chip--right .season-chip__key { color: var(--alert-orange); }

.season-chip__val { color: var(--paper-white); }

/* nav toggle */
.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  justify-self: end;
  padding: .5rem .75rem;
  border: 1px solid var(--grid-line);
  color: var(--paper-white);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
}

.nav-toggle__box {
  display: grid;
  gap: 4px;
  width: 16px;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: var(--signal-cyan);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.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 ---------- */
.site-nav {
  position: relative;
  border-top: 1px solid var(--grid-line);
  background: linear-gradient(180deg, rgba(27, 33, 69, .58), rgba(11, 14, 13, 0) 92%);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  justify-content: center;
}

.site-nav__item { display: flex; }

.site-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: .45rem;
  padding: .78rem clamp(.7rem, 1.5vw, 1.35rem);
  border-left: 1px solid var(--grid-line);
  color: var(--chalk-grey);
  font-size: 15px;
  line-height: 1.5;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.site-nav__item:last-child .site-nav__link { border-right: 1px solid var(--grid-line); }

.site-nav__link:hover {
  color: var(--paper-white);
  background: rgba(70, 227, 196, .07);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: rgba(154, 169, 163, .6);
  transition: color var(--dur) var(--ease);
}

.site-nav__link[aria-current="page"] {
  color: var(--paper-white);
  background: rgba(70, 227, 196, .09);
}

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

.site-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--signal-cyan);
}

/* ---------- reading progress ---------- */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(70, 227, 196, .14);
  pointer-events: none;
}

.read-progress__fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--signal-cyan), var(--alert-orange));
  transition: width 90ms linear;
}

/* ---------- footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  border-top: 1px solid var(--grid-line);
  background-color: var(--wine-red);
  background-image: radial-gradient(circle, rgba(242, 239, 231, .05) 1px, transparent 1.4px);
  background-size: 16px 16px;
  color: var(--paper-white);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding-block: clamp(2.5rem, 5vw, 4rem) clamp(1.75rem, 3vw, 2.5rem);
}

.site-footer__brand { grid-column: span 4; }
.site-footer__cols { grid-column: span 5; }
.site-footer__contact { grid-column: span 3; }

.brand--footer {
  align-items: flex-start;
  padding-inline: 0;
  text-align: left;
}

.brand--footer::after {
  left: 0;
  transform: none;
}

.brand--footer:hover::after { width: 120px; }

.brand--footer .brand__name { font-size: clamp(24px, 3vw, 32px); }
.brand--footer .brand__sub { letter-spacing: .2em; }

.site-footer__line {
  margin-top: 1.1rem;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-72);
}

.footer-entries {
  display: grid;
  gap: .55rem;
  margin-top: 1.35rem;
}

.footer-entries__link {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--paper-16);
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper-white);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-entries__link:hover {
  color: var(--signal-cyan);
  border-bottom-color: var(--signal-cyan);
}

.footer-entries__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--alert-orange);
}

.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2.5vw, 1.75rem);
}

.footer-col__title {
  margin-bottom: .9rem;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .16em;
  line-height: 1.5;
  color: var(--alert-orange);
}

.footer-col__list { display: grid; gap: .5rem; }

.footer-col__list a {
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper-72);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-col__list a:hover {
  color: var(--signal-cyan);
  border-bottom-color: var(--signal-cyan);
}

.contact-list { display: grid; gap: .6rem; }

.contact-list__row {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: .6rem;
  font-size: 14px;
  line-height: 1.65;
}

.contact-list__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--chalk-grey);
}

.contact-list__val {
  color: var(--paper-white);
  word-break: break-word;
}

.contact-list__note {
  margin-top: 1rem;
  font-size: 13px;
  line-height: 1.75;
  color: var(--paper-55);
}

.site-footer__legal {
  border-top: 1px solid var(--paper-16);
  padding-block: 1.1rem;
}

.site-footer__legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1.5rem;
}

.legal-line {
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--paper-72);
}

.legal-note {
  font-size: 12px;
  line-height: 1.7;
  color: var(--paper-55);
}

/* ---------- shared content components ---------- */
.section-head {
  display: grid;
  gap: .5rem;
  padding-bottom: clamp(.9rem, 2vw, 1.4rem);
  border-bottom: 1px solid var(--grid-line);
}

.section-head__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--brocade-red-lite);
}

.section-head__title { font-size: clamp(24px, 3.2vw, 34px); }

.section-head__lede {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--chalk-grey);
}

.prose { max-width: 68ch; }

.prose p {
  margin-bottom: 1.25rem;
  color: var(--paper-88);
}

.prose p:last-child { margin-bottom: 0; }

.prose a {
  color: var(--signal-cyan);
  border-bottom: 1px solid var(--signal-cyan);
}

.prose ul,
.prose ol {
  margin: 0 0 1.25rem 1.1rem;
  color: var(--paper-88);
}

.prose ul li { list-style: square; }
.prose ol li { list-style: decimal; }

.breadcrumb {
  padding-block: clamp(.9rem, 2vw, 1.4rem);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--chalk-grey);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
}

.breadcrumb li { display: flex; align-items: center; gap: .5rem; }

.breadcrumb li + li::before {
  content: "/";
  color: var(--grid-line);
}

.breadcrumb a { transition: color var(--dur) var(--ease); }
.breadcrumb a:hover { color: var(--paper-white); }
.breadcrumb [aria-current="page"] { color: var(--paper-white); }

/* plates */
.plate {
  position: relative;
  padding: clamp(1.1rem, 2.2vw, 1.75rem);
  background: var(--pitch-deep);
  border: 1px solid var(--grid-line);
  box-shadow: 6px 6px 0 0 rgba(27, 33, 69, .8), 7px 7px 0 0 var(--grid-line);
}

.plate--indigo { background: var(--jewel-indigo); }

.plate__label {
  position: absolute;
  top: 0;
  right: 0;
  padding: .2rem .55rem;
  background: var(--signal-cyan);
  color: var(--ink-charcoal);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  line-height: 1.6;
}

/* tags */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .2rem .5rem;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  line-height: 1.6;
}

.tag--cyan { color: var(--signal-cyan); }
.tag--orange { color: var(--alert-orange); }
.tag--brocade { color: var(--brocade-red-lite); }

/* stats */
.stat { display: grid; gap: .2rem; }

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(34px, 6vw, 72px);
  font-weight: 700;
  line-height: 1;
  color: var(--signal-cyan);
}

.stat--orange .stat__value { color: var(--alert-orange); }

.stat__unit {
  margin-left: .35em;
  font-size: .4em;
  font-weight: 400;
  color: var(--chalk-grey);
}

.stat__label {
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--chalk-grey);
}

/* slant guide rules */
.slant-rule {
  height: 1px;
  margin-block: clamp(1.5rem, 4vw, 3rem);
  background: var(--grid-line);
  transform: rotate(-1.4deg);
  transform-origin: left center;
}

.slant-rule--cyan {
  background: linear-gradient(90deg, var(--signal-cyan), rgba(70, 227, 196, 0));
}

/* data table */
.data-table {
  width: 100%;
  font-size: 14px;
  line-height: 1.7;
}

.data-table th,
.data-table td {
  padding: .7rem .8rem;
  text-align: left;
  border-bottom: 1px solid var(--grid-line);
}

.data-table thead th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--chalk-grey);
  border-bottom-color: var(--chalk-grey);
}

.data-table td.num,
.data-table th.num { text-align: right; }

.data-table tbody tr {
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.data-table tbody tr:hover {
  transform: translateY(-2px);
  background-color: rgba(70, 227, 196, .06);
}

/* next links */
.next-links {
  display: grid;
  gap: 1px;
  border: 1px solid var(--grid-line);
  background: var(--grid-line);
}

.next-links__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.15rem;
  background: var(--ink-charcoal);
  font-size: 15px;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.next-links__item:hover {
  background: var(--pitch-deep);
  color: var(--signal-cyan);
}

.next-links__item span:last-child {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--alert-orange);
  white-space: nowrap;
}

/* ---------- media frames ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--grid-line);
  background: var(--pitch-deep);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.05) saturate(.92);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame--empty {
  background-color: var(--pitch-deep);
  background-image: radial-gradient(circle, rgba(242, 239, 231, .06) 1px, transparent 1.4px);
  background-size: 14px 14px;
}

.media-frame__tag {
  position: absolute;
  top: .6rem;
  left: .6rem;
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: .55rem .75rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--paper-white);
  background: linear-gradient(180deg, rgba(11, 14, 13, 0), rgba(11, 14, 13, .88));
}

/* ---------- responsive ---------- */
@media (max-width: 1024px) {
  .site-footer__brand { grid-column: span 12; }
  .site-footer__cols { grid-column: span 12; }
  .site-footer__contact { grid-column: span 12; }
  .season-chip { font-size: 11px; padding: .3rem .55rem; }
}

@media (max-width: 900px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .span-6, .span-7, .span-8 { grid-column: span 6; }
  html { scroll-padding-top: 108px; }
}

@media (max-width: 880px) {
  .masthead__utility { padding-block: .5rem; }
  .masthead__frame { grid-template-columns: 1fr auto; padding-block: .8rem .7rem; }
  .brand { align-items: flex-start; padding-inline: 0; }
  .brand::after { left: 0; transform: none; }
  .season-chip--left,
  .season-chip--right { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav { display: none; }
  .site-nav[data-open] {
    display: block;
    background: rgba(27, 33, 69, .62);
  }
  .site-nav__list { flex-direction: column; flex-wrap: nowrap; }
  .site-nav__item { display: block; }
  .site-nav__link {
    padding: .85rem .2rem;
    border-left: 0;
    border-top: 1px solid var(--grid-line);
  }
  .site-nav__item:first-child .site-nav__link { border-top: 0; }
  .site-nav__item:last-child .site-nav__link { border-right: 0; }
  .site-nav__link[aria-current="page"]::after {
    left: 0;
    right: auto;
    top: 0;
    bottom: 0;
    width: 2px;
    height: auto;
  }

  .masthead[data-shrunk] .brand__sub { opacity: 1; }
  .site-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.5rem; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 2; }
  .masthead__actions { width: 100%; }
  .site-footer__cols { grid-template-columns: 1fr; }
  .next-links__item { flex-direction: column; gap: .3rem; }
  .data-table { font-size: 13.5px; }
  .data-table th, .data-table td { padding: .6rem .5rem; }
  html { scroll-padding-top: 96px; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .btn:hover,
  .data-table tbody tr:hover,
  .next-links__item:hover { transform: none; }
}