/* =========================================================
   球速体育入口 · 共享样式表 /assets/site.css
   夜场绿底 · 奶油纸面 · 荧光柠檬黄越位线
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html,
body { margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  background: var(--field-900);
  color: var(--paper);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, pre { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
img, svg, video { display: block; max-width: 100%; }
table { border-collapse: collapse; }
hr { border: 0; }

/* ---------- 2. Tokens ---------- */
:root {
  --field-900: #0B1F17;
  --field-800: #12301F;
  --field-950: #091811;
  --line-700: #1E4A32;
  --paper: #F4EFE4;
  --ink-900: #241C14;
  --lemon: #E4FF4C;
  --blue: #4FA8E0;
  --flag: #E2542A;
  --moss: #8FA79A;
  --ash: #D8D3C6;

  --maxw: 1240px;
  --gutter: clamp(1rem, 4vw, 2.75rem);

  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", Georgia, "Times New Roman", serif;
  --display: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Arial Narrow", -apple-system, sans-serif;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. Base typography ---------- */
h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.015em;
}

strong, b { font-weight: 700; }

code, kbd, samp, .u-mono {
  font-family: var(--mono);
  font-feature-settings: "tnum" 1;
}

::selection { background: var(--lemon); color: var(--field-900); }

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

.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;
}

/* ---------- 4. Focus ---------- */
:focus { outline: none; }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}

.paper :focus-visible { outline-color: var(--flag); }

/* ---------- 5. Skip link ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -120px;
  z-index: 300;
  display: inline-block;
  padding: 0.65rem 1.1rem;
  background: var(--lemon);
  color: var(--field-900);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  transition: top 0.2s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible { top: 0.65rem; }

/* ---------- 6. Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(11, 31, 23, 0.95);
  border-bottom: 1px solid var(--line-700);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.site-header__inner {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: 70px;
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.75rem);
}

.brand { margin-right: auto; min-width: 0; }

.brand__link {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.4rem 0;
}

.brand__mark {
  flex: none;
  display: block;
  width: 4px;
  height: 30px;
  background: var(--lemon);
}

.brand__text { display: block; min-width: 0; }

.brand__name {
  display: block;
  font-family: var(--display);
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--paper);
  white-space: nowrap;
}

.brand__tagline {
  display: block;
  font-family: var(--mono);
  font-size: 0.65625rem;
  letter-spacing: 0.14em;
  color: var(--moss);
  white-space: nowrap;
}

/* --- 主导航 --- */
.site-nav { min-width: 0; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.35rem, 1.2vw, 1rem);
}

.site-nav__item { list-style: none; }

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.38em;
  padding: 0.55rem 0.1rem;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--moss);
  border-bottom: 2px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.site-nav__link:hover { color: var(--paper); }

.site-nav__index {
  font-family: var(--mono);
  font-size: 0.59375rem;
  letter-spacing: 0.08em;
  color: var(--flag);
  transition: color 0.18s var(--ease);
}

.site-nav__link:hover .site-nav__index { color: var(--lemon); }

.site-nav__link[aria-current="page"] {
  color: var(--paper);
  font-weight: 700;
  border-bottom-color: var(--lemon);
}

.site-nav__link[aria-current="page"] .site-nav__index { color: var(--lemon); }

/* --- 头部工具区 --- */
.header-utility {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: none;
}

.header-utility__link {
  display: inline-block;
  padding: 0.35rem 0.62rem;
  font-family: var(--mono);
  font-size: 0.65625rem;
  letter-spacing: 0.12em;
  color: var(--blue);
  border: 1px solid rgba(79, 168, 224, 0.42);
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.header-utility__link:hover {
  background: rgba(79, 168, 224, 0.16);
  border-color: var(--blue);
  color: #BCE0F7;
}

/* --- 移动开关 --- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  flex: none;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--line-700);
  color: var(--moss);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.nav-toggle:hover { border-color: var(--lemon); color: var(--lemon); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--lemon);
  transition: background 0.18s var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--lemon);
  transition: transform 0.22s var(--ease), top 0.22s var(--ease);
}

.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

.nav-toggle__label {
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
}

/* --- 页眉越位线 --- */
.header-yardline {
  position: relative;
  height: 2px;
  background: var(--line-700);
  overflow: hidden;
}

.header-yardline__fill {
  display: block;
  width: 0;
  height: 100%;
  background: var(--lemon);
  transition: width 0.1s linear;
}

/* ---------- 7. Footer ---------- */
.site-footer {
  margin-top: clamp(3rem, 8vw, 6rem);
  background: var(--field-950);
  border-top: 1px solid var(--line-700);
  color: var(--moss);
  font-size: 0.875rem;
}

.site-footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4.25rem) var(--gutter) clamp(1.75rem, 4vw, 3rem);
  display: grid;
  grid-template-columns: minmax(190px, 1fr) 2.7fr;
  gap: clamp(1.75rem, 4vw, 3rem);
}

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

.site-footer__logo {
  font-family: var(--display);
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.site-footer__tagline {
  margin-top: 0.35rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--moss);
}

.site-footer__signoff {
  margin-top: 1.1rem;
  padding-left: 0.7rem;
  border-left: 2px solid var(--flag);
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--ash);
}

.site-footer__index {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1.25rem, 2.6vw, 2.25rem);
}

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

.footer-col__title {
  padding-bottom: 0.55rem;
  margin-bottom: 0.75rem;
  border-bottom: 1px solid var(--line-700);
  font-family: var(--mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lemon);
}

.footer-col__list { display: block; }

.footer-col__item + .footer-col__item { margin-top: 0.5rem; }

.footer-col__text {
  display: block;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--moss);
}

.footer-col__link {
  display: inline-block;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ash);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-col__link:hover {
  color: var(--lemon);
  border-bottom-color: var(--lemon);
}

.site-footer__meta {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(1.1rem, 2.5vw, 1.6rem) var(--gutter) clamp(2rem, 5vw, 2.75rem);
  border-top: 1px solid var(--line-700);
  display: grid;
  gap: 0.6rem;
}

.site-footer__contact {
  font-family: var(--mono);
  font-size: 0.6875rem;
  line-height: 1.9;
  letter-spacing: 0.06em;
  color: var(--moss);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--moss);
}

.site-footer__legal-link {
  color: var(--blue);
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.site-footer__legal-link:hover {
  color: #BCE0F7;
  border-bottom-color: #BCE0F7;
}

.site-footer__year {
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--line-700);
}

/* ---------- 8. Layout utilities ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.grid12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1rem, 2.4vw, 2rem);
}

.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; }

/* ---------- 9. Surfaces ---------- */
.paper {
  position: relative;
  background: var(--paper);
  color: #3A3025;
  padding: clamp(1.5rem, 3.6vw, 3rem);
  box-shadow: 14px 14px 0 -1px rgba(18, 48, 31, 0.6);
}

.paper::after {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(36, 28, 20, 0.14);
  pointer-events: none;
}

.paper h1,
.paper h2,
.paper h3 { color: var(--ink-900); }

.paper .prose { color: #3A3025; }

.panel {
  background: var(--field-800);
  border: 1px solid var(--line-700);
  padding: clamp(1.15rem, 2.8vw, 1.9rem);
  color: var(--ash);
}

/* ---------- 10. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  padding: 0.72rem 1.15rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--paper);
  background: transparent;
  border: 1px solid var(--line-700);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.btn:hover {
  color: var(--lemon);
  border-color: var(--lemon);
  background: rgba(228, 255, 76, 0.06);
}

.btn--solid {
  background: var(--lemon);
  border-color: var(--lemon);
  color: var(--field-900);
  font-weight: 700;
}

.btn--solid:hover {
  background: #F1FF8C;
  border-color: #F1FF8C;
  color: var(--field-900);
}

.btn--blue {
  border-color: rgba(79, 168, 224, 0.55);
  color: var(--blue);
}

.btn--blue:hover {
  background: rgba(79, 168, 224, 0.14);
  border-color: var(--blue);
  color: #BCE0F7;
}

/* ---------- 11. Breadcrumb ---------- */
.breadcrumb { padding-block: 1.1rem; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--moss);
}

.breadcrumb__item { display: inline-flex; align-items: center; gap: 0.5rem; }

.breadcrumb__link {
  color: var(--moss);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.breadcrumb__link:hover { color: var(--lemon); border-bottom-color: var(--lemon); }

.breadcrumb__sep { color: var(--flag); }

.breadcrumb__current { color: var(--ash); }

/* ---------- 12. Editorial parts ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 0.9rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--line-700);
}

.section-head__index {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--flag);
}

.section-head__title {
  font-family: var(--display);
  font-size: clamp(1.3rem, 2.7vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.section-head__note {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--moss);
}

.paper .section-head { border-bottom-color: var(--ash); }
.paper .section-head__title { color: var(--ink-900); }

.yardline {
  position: relative;
  height: 1px;
  background: var(--line-700);
  margin-block: clamp(2rem, 5vw, 3.5rem);
}

.yardline::after {
  content: "";
  position: absolute;
  left: 0;
  top: -1px;
  width: clamp(52px, 9vw, 132px);
  height: 3px;
  background: var(--lemon);
}

.meta-band {
  padding-left: 0.85rem;
  border-left: 2px solid var(--flag);
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.9;
  letter-spacing: 0.06em;
  color: var(--moss);
}

.meta-band strong { color: var(--lemon); font-weight: 500; }

/* ---------- 13. Tags ---------- */
.tag {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  font-family: var(--mono);
  font-size: 0.65625rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--flag);
  color: var(--paper);
}

.tag--lemon { background: var(--lemon); color: var(--field-900); font-weight: 700; }
.tag--blue { background: var(--blue); color: #06131C; }
.tag--outline {
  background: transparent;
  border: 1px solid var(--line-700);
  color: var(--moss);
}

/* ---------- 14. Prose ---------- */
.prose {
  font-size: 1.0625rem;
  line-height: 1.78;
  color: var(--ash);
}

.prose > p + p { margin-top: 1.05em; }

.prose h2 {
  margin-top: 1.9em;
  font-family: var(--serif);
  font-size: clamp(1.25rem, 2.3vw, 1.6rem);
  font-weight: 600;
  line-height: 1.42;
  letter-spacing: 0;
  color: var(--paper);
}

.prose h3 {
  margin-top: 1.55em;
  font-family: var(--sans);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.prose h2 + p,
.prose h3 + p,
.prose h2 + ul,
.prose h3 + ul { margin-top: 0.65em; }

.prose ul { margin-top: 0.85em; }

.prose li {
  position: relative;
  padding-left: 1.15em;
}

.prose li + li { margin-top: 0.45em; }

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.76em;
  width: 8px;
  height: 2px;
  background: var(--flag);
}

.prose blockquote {
  margin-top: 1.5em;
  padding: 0.25em 0 0.25em 1.1em;
  border-left: 2px solid var(--lemon);
  font-family: var(--serif);
  font-size: 1.0625rem;
}

.prose a {
  color: var(--blue);
  border-bottom: 1px solid rgba(79, 168, 224, 0.42);
  transition: border-color 0.18s var(--ease);
}

.prose a:hover { border-bottom-color: var(--blue); }

.paper .prose h2,
.paper .prose h3 { color: var(--ink-900); }

.paper .prose blockquote { border-left-color: var(--flag); }

.paper .prose a { color: #1C5A86; border-bottom-color: rgba(28, 90, 134, 0.4); }

/* ---------- 15. Data table ---------- */
.data-table {
  width: 100%;
  font-family: var(--mono);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--ash);
}

.data-table caption {
  padding-bottom: 0.7rem;
  text-align: left;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--moss);
}

.data-table th,
.data-table td {
  padding: 0.6rem 0.7rem;
  text-align: left;
  border-bottom: 1px solid var(--line-700);
  vertical-align: top;
}

.data-table th {
  font-size: 0.65625rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--moss);
}

.data-table tbody tr:nth-child(even) { background: rgba(30, 74, 50, 0.22); }

.data-table tbody tr:hover { background: rgba(228, 255, 76, 0.07); }

.data-table td[data-mark="offside"] {
  color: var(--lemon);
  border-left: 2px solid var(--lemon);
}

.data-table td[data-mark="official"] { color: var(--blue); }

.paper .data-table { color: var(--ink-900); }
.paper .data-table th { color: #7A7263; }
.paper .data-table th,
.paper .data-table td { border-bottom-color: var(--ash); }
.paper .data-table tbody tr:nth-child(even) { background: rgba(216, 211, 198, 0.4); }
.paper .data-table tbody tr:hover { background: rgba(226, 84, 42, 0.09); }

/* ---------- 16. Tabs ---------- */
.tabs {
  background: var(--field-800);
  border: 1px solid var(--line-700);
}

.tabs__list {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line-700);
}

.tabs__btn {
  padding: 0.72rem 1rem;
  font-family: var(--mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--moss);
  border-bottom: 2px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.tabs__btn:hover { color: var(--paper); }

.tabs__btn[aria-selected="true"] {
  color: var(--lemon);
  border-bottom-color: var(--lemon);
  background: rgba(228, 255, 76, 0.06);
}

.tabs__panel { padding: clamp(1rem, 2.6vw, 1.6rem); }

.tabs__panel[hidden] { display: none; }

/* ---------- 17. Image frames ---------- */
.media-frame {
  --frame-ratio: 16 / 9;
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(135deg, var(--field-800) 0%, #0D2519 55%, var(--line-700) 100%);
  border: 1px solid var(--line-700);
}

.media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: var(--frame-ratio);
  object-fit: cover;
  filter: saturate(0.85) contrast(1.06);
}

.media-frame--wide { --frame-ratio: 21 / 9; }
.media-frame--tall { --frame-ratio: 3 / 4; }
.media-frame--square { --frame-ratio: 1 / 1; }
.media-frame--crop { --frame-ratio: 5 / 3; }

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.5rem 0.75rem;
  background: rgba(9, 24, 17, 0.86);
  border-top: 1px solid var(--line-700);
  font-family: var(--mono);
  font-size: 0.65625rem;
  letter-spacing: 0.08em;
  color: var(--moss);
}

/* ---------- 18. Section TOC ---------- */
.toc__list { display: block; }

.toc__item + .toc__item { margin-top: 0.15rem; }

.toc__link {
  display: block;
  padding: 0.4rem 0 0.4rem 0.85rem;
  border-left: 2px solid var(--line-700);
  font-family: var(--mono);
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--moss);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.toc__link:hover { color: var(--paper); border-left-color: var(--moss); }

.toc__link[aria-current="true"] {
  color: var(--paper);
  border-left-color: var(--lemon);
}

/* ---------- 19. Back to top ---------- */
.back-to-top {
  position: fixed;
  right: clamp(0.75rem, 3vw, 1.5rem);
  bottom: clamp(0.75rem, 3vw, 1.5rem);
  z-index: 140;
  display: none;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  background: rgba(18, 48, 31, 0.95);
  border: 1px solid var(--line-700);
  color: var(--lemon);
  font-family: var(--mono);
  font-size: 0.875rem;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.back-to-top[data-visible] { display: flex; }

.back-to-top:hover {
  background: var(--field-800);
  border-color: var(--lemon);
}

/* ---------- 20. Responsive ---------- */
@media (max-width: 1080px) {
  .header-utility__link { padding: 0.3rem 0.5rem; }
  .site-nav__link { font-size: 0.8125rem; }
}

@media (max-width: 960px) {
  .header-utility { display: none; }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: var(--field-800);
    border-top: 1px solid var(--line-700);
    border-bottom: 1px solid var(--line-700);
    transition: max-height 0.34s var(--ease), visibility 0.34s linear;
  }

  .site-nav[data-open] {
    max-height: 80vh;
    overflow-y: auto;
    visibility: visible;
  }

  .site-nav__list {
    display: block;
    padding: 0.35rem var(--gutter) 1rem;
  }

  .site-nav__item { border-bottom: 1px solid rgba(30, 74, 50, 0.6); }

  .site-nav__link {
    display: flex;
    width: 100%;
    padding: 0.9rem 0.7rem;
    font-size: 0.9375rem;
    border-bottom: 0;
    border-left: 3px solid transparent;
  }

  .site-nav__link[aria-current="page"] {
    border-bottom-color: transparent;
    border-left-color: var(--lemon);
    background: rgba(228, 255, 76, 0.06);
  }

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

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

@media (max-width: 900px) {
  .grid12 { grid-template-columns: minmax(0, 1fr); }

  .col-3,
  .col-4,
  .col-5,
  .col-6,
  .col-7,
  .col-8,
  .col-12 { grid-column: 1 / -1; }

  .section-head__note { margin-left: 0; width: 100%; }

  .paper { box-shadow: 8px 8px 0 -1px rgba(18, 48, 31, 0.6); }
}

@media (max-width: 640px) {
  body { font-size: 16px; }

  .brand__tagline { display: none; }

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

  .tabs__btn { padding: 0.65rem 0.75rem; font-size: 0.625rem; }

  .data-table { font-size: 0.75rem; }

  .data-table th,
  .data-table td { padding: 0.5rem 0.45rem; }
}

/* ---------- 21. Reduced motion ---------- */
@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;
    transition-delay: 0ms !important;
  }

  .header-yardline__fill { transition: none; }
}