/* ==========================================================================
   必博体育 BEPLAY · /assets/site.css
   共享外壳：框架式导航 + 登记簿版式 + 工业档案材质
   ========================================================================== */

/* ---------- 1. RESET ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, figcaption, blockquote, dl, dt, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
table { border-collapse: collapse; width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
hr { border: 0; border-top: 1px solid var(--hair); margin: 0; }

/* ---------- 2. TOKENS ---------- */
:root {
  --paper: #F5F0E6;
  --brick: #3F444A;
  --deep: #0B2233;
  --blue: #1358FF;
  --bronze: #2E6E60;
  --ink: #0E1114;
  --orange: #FF6A1A;
  --lime: #E4FF3F;
  --hair: #C8C4BB;
  --paper-dim: rgba(245, 240, 230, .74);
  --paper-line: rgba(245, 240, 230, .22);

  --font-display: "Oswald", "Barlow Condensed", "Noto Sans SC", sans-serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", "Noto Sans SC", monospace;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;

  --gutter: clamp(1rem, 4vw, 3.5rem);
  --maxw: 1360px;
  --read: 36em;
  --hairline: 1px solid var(--hair);
  --shadow-flat: 0 1px 0 rgba(14, 17, 20, .05);
  --shadow-inner: inset 0 1px 0 rgba(255, 255, 255, .55);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 220ms;
}

/* ---------- 3. BASE ---------- */
body {
  min-height: 100vh;
  background-color: var(--paper);
  background-image:
    repeating-linear-gradient(0deg, rgba(63, 68, 74, .055) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(90deg, rgba(63, 68, 74, .045) 0 1px, transparent 1px 32px);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
}
/* 页面左缘固定框线 */
body::before {
  content: "";
  position: fixed;
  inset: 0 auto 0 0;
  width: 3px;
  z-index: 90;
  pointer-events: none;
  background: linear-gradient(180deg, var(--blue) 0 16%, var(--orange) 16% 20%, var(--bronze) 20% 24%, var(--hair) 24% 100%);
}
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -.01em;
  color: var(--ink);
}
h1 { font-size: clamp(2.5rem, 7vw, 5.5rem); font-weight: 800; text-transform: uppercase; }
h2 { font-size: clamp(1.5rem, 3vw, 2.4rem); text-transform: uppercase; }
h3 { font-size: clamp(1.1rem, 1.6vw, 1.35rem); line-height: 1.3; }
h4 { font-size: 1rem; letter-spacing: .02em; }
p { margin: 0; }
strong { font-weight: 700; }
mark { background: var(--lime); color: var(--ink); padding: 0 .15em; }
::selection { background: var(--blue); color: #fff; }
:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
[id], [data-section] { scroll-margin-top: 130px; }
.shell { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
.shell--narrow { max-width: 960px; }
.mono { font-family: var(--font-mono); letter-spacing: .08em; }
.note { font-size: 13px; line-height: 1.7; color: var(--brick); }
.lede { font-size: clamp(1.05rem, 1.6vw, 1.25rem); line-height: 1.75; color: var(--brick); max-width: 44em; }
.prose { max-width: var(--read); }
.prose p { margin-bottom: 1.1em; }
.prose p:last-child { margin-bottom: 0; }
.prose h3 { margin: 1.6em 0 .6em; }
.prose a, .link-inline { color: var(--blue); border-bottom: 1px solid var(--blue); transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease); }
.prose a:hover, .link-inline:hover { color: var(--orange); border-bottom-color: var(--orange); }

/* ---------- 4. SKIP LINK ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 200;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  padding: .6rem .9rem;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: .6rem; }

/* ---------- 5. HEADER ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--paper);
  border-bottom: var(--hairline);
  box-shadow: 0 1px 14px rgba(14, 17, 20, .07);
}
.site-header::after {
  content: "";
  display: block;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, var(--hair) 0 1px, transparent 1px 28px);
  border-top: 1px solid rgba(200, 196, 187, .5);
}
.header-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: .38rem var(--gutter);
  background: var(--deep);
  color: var(--paper-dim);
  border-bottom: 1px solid rgba(245, 240, 230, .16);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.strip-item {
  display: flex;
  align-items: center;
  gap: .5rem;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.strip-item--right::before {
  content: "";
  display: inline-block;
  width: 14px;
  height: 1px;
  background: var(--orange);
  flex: none;
}
.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex: none;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(228, 255, 63, .18);
  animation: beplay-pulse 2s ease-in-out infinite;
}
@keyframes beplay-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .35; }
}
.header-main {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(.6rem, 1.6vw, 1.5rem);
  padding: .62rem var(--gutter);
}
.brand-lockup { display: flex; flex-direction: column; min-width: 0; }
.brand {
  display: inline-flex;
  align-items: baseline;
  gap: .55rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.15rem, 1.8vw, 1.5rem);
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--ink);
  white-space: nowrap;
}
.brand-mark {
  font-family: var(--font-mono);
  font-size: .6em;
  font-weight: 500;
  letter-spacing: .22em;
  color: var(--blue);
  padding-left: .55rem;
  border-left: 1px solid var(--hair);
  transition: color var(--dur) var(--ease);
}
.brand:hover .brand-mark { color: var(--orange); }
.brand-season {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--bronze);
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .5rem .7rem;
  background: var(--paper);
  border: var(--hairline);
  color: var(--brick);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.nav-toggle-bars { display: flex; flex-direction: column; gap: 3px; width: 16px; }
.nav-toggle-bar {
  height: 2px;
  background: var(--brick);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav-toggle[data-open] .nav-toggle-bar { background: var(--blue); }
.nav-toggle[data-open] .nav-toggle-bar:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[data-open] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[data-open] .nav-toggle-bar:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
.site-nav { margin-left: auto; }
.nav-list { display: flex; align-items: stretch; }
.nav-item { display: flex; }
.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: .45rem;
  padding: .5rem clamp(.5rem, 1vw, .95rem);
  border-left: var(--hairline);
  font-size: .9rem;
  font-weight: 500;
  color: var(--brick);
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav-item:last-child .nav-link { border-right: var(--hairline); }
.nav-index {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .08em;
  color: var(--bronze);
  transition: color var(--dur) var(--ease);
}
.nav-link:hover { color: var(--ink); background: rgba(19, 88, 255, .07); }
.nav-link:hover .nav-index { color: var(--blue); }
.nav-link[aria-current="page"] { color: var(--blue); background: rgba(19, 88, 255, .1); }
.nav-link[aria-current="page"] .nav-index { color: var(--orange); }
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: var(--blue);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: .6rem;
  margin-left: clamp(.5rem, 1.4vw, 1.2rem);
}
.header-code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--brick);
  background: var(--paper);
  border: var(--hairline);
  padding: .32rem .5rem;
  white-space: nowrap;
}

/* ---------- 6. FOOTER ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  padding: calc(46px + clamp(2.5rem, 5vw, 3.5rem)) 0 1.5rem;
  background: var(--deep);
  color: var(--paper-dim);
  clip-path: polygon(0 46px, 100% 0, 100% 100%, 0 100%);
}
.footer-crown {
  position: absolute;
  top: 44px;
  left: -2%;
  right: -2%;
  height: 3px;
  pointer-events: none;
  transform: rotate(-1.6deg);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--blue) 0 18%, var(--lime) 18% 22%, var(--orange) 22% 30%, var(--paper-line) 30% 100%);
}
.footer-inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2.1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
}
.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: .9rem;
  padding-left: clamp(.9rem, 2vw, 1.4rem);
  border-left: 3px solid var(--blue);
}
.footer-logo {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 2.4vw, 1.9rem);
  letter-spacing: .02em;
  color: var(--paper);
}
.footer-logo-mark {
  font-family: var(--font-mono);
  font-size: .55em;
  font-weight: 500;
  letter-spacing: .24em;
  color: var(--lime);
}
.footer-note { font-size: 13px; line-height: 1.7; color: var(--paper-dim); max-width: 32em; }
.footer-season {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .3rem .6rem;
  border: 1px solid var(--paper-line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--lime);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
}
.footer-col { min-width: 0; }
.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--paper);
  padding-bottom: .6rem;
  margin-bottom: .85rem;
  border-bottom: 1px solid var(--paper-line);
}
.footer-list { display: flex; flex-direction: column; gap: .55rem; }
.footer-link {
  font-size: 14px;
  color: var(--paper-dim);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-link:hover, .footer-link:focus-visible { color: var(--lime); border-bottom-color: var(--lime); }
.footer-contact { display: flex; flex-direction: column; gap: .5rem; font-size: 14px; color: var(--paper-dim); }
.footer-contact li { line-height: 1.65; }
.footer-contact .mono { font-size: 12.5px; letter-spacing: .06em; color: var(--paper); }
.footer-base {
  max-width: var(--maxw);
  margin: clamp(2rem, 4vw, 3rem) auto 0;
  padding: 1rem var(--gutter) 0;
  border-top: 1px solid var(--paper-line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1.5rem;
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(245, 240, 230, .62);
}
.footer-legal a {
  color: var(--paper-dim);
  border-bottom: 1px solid var(--paper-line);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.footer-legal a:hover { color: var(--lime); border-bottom-color: var(--lime); }
.footer-update { font-size: 11px; letter-spacing: .14em; color: rgba(245, 240, 230, .55); }

/* ---------- 7. BREADCRUMBS ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  padding-block: .9rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--brick);
}
.breadcrumbs li { display: flex; align-items: center; gap: .5rem; }
.breadcrumbs li + li::before { content: "/"; color: var(--hair); }
.breadcrumbs a:hover { color: var(--blue); }
.breadcrumbs [aria-current="page"] { color: var(--ink); }

/* ---------- 8. SECTION RHYTHM ---------- */
.section { padding-block: clamp(2.5rem, 6vw, 5rem); }
.section--tight { padding-block: clamp(1.5rem, 4vw, 3rem); }
.section-rule {
  height: 6px;
  border-top: var(--hairline);
  background-image: repeating-linear-gradient(90deg, var(--hair) 0 1px, transparent 1px 32px);
}
.index-block {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .3rem .6rem;
  border: var(--hairline);
  background: rgba(245, 240, 230, .75);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--brick);
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .28rem .55rem;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--bronze);
}
.tag--season { color: var(--deep); background: var(--lime); border-color: var(--lime); }
.tag--cert { color: var(--bronze); }
.tag--alert { color: var(--orange); }
.tag--data { color: var(--blue); }
.stat {
  display: flex;
  flex-direction: column;
  gap: .25rem;
  padding-left: clamp(.75rem, 2vw, 1.25rem);
  border-left: 3px solid var(--blue);
}
.stat-value {
  display: flex;
  align-items: baseline;
  gap: .35rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--ink);
}
.stat-unit {
  font-family: var(--font-mono);
  font-size: .5em;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--brick);
}
.stat-label { font-size: 13px; color: var(--brick); }

/* ---------- 9. GRID ---------- */
.grid-12 { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: clamp(1rem, 2.2vw, 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-9 { grid-column: span 9; }
.col-10 { grid-column: span 10; }
.col-12 { grid-column: span 12; }
.push-2 { grid-column-start: 2; }
.push-3 { grid-column-start: 3; }
.push-6 { grid-column-start: 6; }
.stack { display: flex; flex-direction: column; gap: clamp(.75rem, 1.6vw, 1.25rem); }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: .6rem; }

/* ---------- 10. MEDIA ---------- */
.media {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--deep);
  border: var(--hairline);
  box-shadow: var(--shadow-inner);
}
.media img, .media svg, .media video { width: 100%; height: 100%; object-fit: cover; }
.media--wide { aspect-ratio: 16 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 3 / 4; }
.media--report { aspect-ratio: 1 / 1.414; }
.media[data-placeholder]::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(135deg, rgba(245, 240, 230, .1) 0 2px, transparent 2px 10px);
}
.media[data-placeholder]::before {
  content: attr(data-placeholder);
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: .25rem .55rem;
  background: rgba(11, 34, 51, .88);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.media-cap {
  margin-top: .5rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--brick);
}

/* ---------- 11. BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .7rem 1.1rem;
  border: 1px solid var(--brick);
  background: transparent;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.btn:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.btn-primary { background: var(--orange); border-color: var(--orange); color: var(--ink); }
.btn-primary:hover { background: var(--blue); border-color: var(--blue); color: #fff; }
.btn-ghost { border-color: var(--paper-line); color: var(--paper); }
.btn-ghost:hover { background: var(--lime); border-color: var(--lime); color: var(--deep); }
.btn-sm { padding: .48rem .8rem; font-size: 11px; letter-spacing: .1em; }

/* ---------- 12. DRAWER ---------- */
.drawer { border-top: var(--hairline); }
.drawer:last-child { border-bottom: var(--hairline); }
.drawer > summary {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .9rem .25rem;
  list-style: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--ink);
  transition: color var(--dur) var(--ease);
}
.drawer > summary::-webkit-details-marker { display: none; }
.drawer > summary::before {
  content: "+";
  flex: none;
  width: 1em;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--orange);
}
.drawer[open] > summary { color: var(--blue); }
.drawer[open] > summary::before { content: "–"; color: var(--blue); }
.drawer-body { padding: 0 .25rem 1.25rem 1.75rem; max-width: var(--read); }

/* ---------- 13. SEGMENTED (赛季切换) ---------- */
.segmented { display: inline-flex; flex-wrap: wrap; border: var(--hairline); background: var(--paper); }
.segmented-input { position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none; }
.segmented-option {
  position: relative;
  padding: .5rem .9rem;
  border-right: var(--hairline);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--brick);
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.segmented-option:last-of-type { border-right: 0; }
.segmented-input:checked + .segmented-option { background: var(--ink); color: var(--lime); }
.segmented-input:focus-visible + .segmented-option { outline: 2px solid var(--blue); outline-offset: -2px; }
.segmented-panel { display: none; }
.segmented-panel[data-active] { display: block; }

/* ---------- 14. TOC ---------- */
.toc {
  position: sticky;
  top: 130px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
}
.toc-title {
  display: block;
  padding-bottom: .6rem;
  margin-bottom: .5rem;
  border-bottom: var(--hairline);
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--brick);
}
.toc-list { display: flex; flex-direction: column; gap: .1rem; }
.toc-link {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  padding: .4rem .4rem .4rem 0;
  border-left: 2px solid transparent;
  color: var(--brick);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}
.toc-link:hover { color: var(--ink); }
.toc-link[aria-current="true"] { color: var(--blue); border-left-color: var(--blue); padding-left: .6rem; }
.toc-num { font-size: 10.5px; color: var(--hair); }
.toc-link[aria-current="true"] .toc-num { color: var(--orange); }

/* ---------- 15. SCROLL PROGRESS & BACK TO TOP ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 95;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--blue), var(--bronze) 55%, var(--orange));
}
.totop {
  position: fixed;
  right: clamp(.75rem, 2vw, 1.5rem);
  bottom: clamp(.75rem, 2vw, 1.5rem);
  z-index: 85;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .6rem .85rem;
  background: var(--deep);
  border: 1px solid var(--deep);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.totop[data-visible] { opacity: 1; visibility: visible; transform: none; }
.totop:hover { background: var(--blue); border-color: var(--blue); color: #fff; }

/* ---------- 16. REVEAL ---------- */
html.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}
html.js-reveal [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 17. RESPONSIVE ---------- */
@media (max-width: 1200px) {
  .header-code { display: none; }
}
@media (max-width: 960px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5 { grid-column: span 3; }
  .col-6 { grid-column: span 6; }
  .col-7, .col-8, .col-9, .col-10, .col-12 { grid-column: span 6; }
  .push-2, .push-3, .push-6 { grid-column-start: auto; }
  .toc { position: static; top: auto; }
  .nav-toggle { display: inline-flex; order: 3; margin-left: auto; }
  .site-nav {
    order: 4;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 6;
    margin-left: 0;
    max-height: calc(100vh - 110px);
    overflow-y: auto;
    background: var(--paper);
    border-bottom: 1px solid var(--brick);
    box-shadow: 0 18px 30px rgba(14, 17, 20, .14);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur);
  }
  .site-nav[data-open] { opacity: 1; visibility: visible; transform: none; }
  .nav-list { display: block; padding: .5rem var(--gutter) 1rem; }
  .nav-item { display: block; }
  .nav-link {
    border-left: 0;
    border-bottom: var(--hairline);
    padding: .9rem 0 .9rem .75rem;
    font-size: 1.05rem;
  }
  .nav-item:last-child .nav-link { border-right: 0; border-bottom: 0; }
  .nav-link[aria-current="page"] { background: transparent; box-shadow: inset 3px 0 0 var(--blue); }
  .nav-link[aria-current="page"]::after { display: none; }
  .header-actions { order: 2; margin-left: auto; }
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 700px) {
  .site-footer {
    clip-path: polygon(0 22px, 100% 0, 100% 100%, 0 100%);
    padding-top: calc(22px + 2.25rem);
  }
  .footer-crown { top: 20px; transform: rotate(-3.4deg); }
  .strip-item--right { display: none; }
  .header-strip { font-size: 10px; letter-spacing: .1em; justify-content: flex-start; }
}
@media (max-width: 600px) {
  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
  .grid-12 > * { grid-column: span 2; }
  .push-2, .push-3, .push-6 { grid-column-start: auto; }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .footer-base { justify-content: flex-start; }
}
@media (max-width: 560px) {
  .header-actions .btn { display: none; }
  .nav-toggle-label { display: none; }
}

/* ---------- 18. 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;
  }
  html.js-reveal [data-reveal] { opacity: 1; transform: none; }
  .pulse-dot { animation: none; opacity: 1; }
  .totop { transform: none; }
}