/* =========================================================
   开云体育登录 · 共享外壳样式 /assets/site.css
   夜战报 → 晨光刷新
   ========================================================= */

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

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

body { margin: 0; }

h1, h2, h3, h4, h5, p, figure, blockquote { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }

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

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

a { color: inherit; }

/* ---------- 2. tokens ---------- */
:root {
  --c-night: #060A12;
  --c-indigo: #0D1626;
  --c-line: #1E2A42;
  --c-violet: #241C3A;
  --c-dawn: #FF7A2F;
  --c-dawn-soft: #FFB25C;
  --c-cyan: #3DE0D0;
  --c-pulse: #C8F45B;
  --c-fog: #E9EFF8;
  --c-mute: #93A3BC;
  --c-body: #C6D2E4;

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

  --gap: 24px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-pill: 999px;

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

/* ---------- 3. ambient background ---------- */
body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--c-night);
  color: var(--c-fog);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: -10%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(120% 70% at 78% -10%, rgba(255, 178, 92, .20), rgba(255, 122, 47, .06) 38%, transparent 66%),
    radial-gradient(90% 60% at 10% 2%, rgba(61, 224, 208, .13), transparent 62%),
    linear-gradient(180deg, var(--c-indigo) 0%, var(--c-violet) 26%, #0A1020 52%, var(--c-night) 78%);
  animation: sky-drift 18s ease-in-out infinite alternate;
}

@keyframes sky-drift {
  from { transform: translate3d(0, 0, 0) scale(1.02); }
  to   { transform: translate3d(-1.2%, 1.4%, 0) scale(1.06); }
}

@keyframes status-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(200, 244, 91, .55); }
  50%      { box-shadow: 0 0 0 6px rgba(200, 244, 91, 0); }
}

/* ---------- 4. typography base ---------- */
.mono,
.data,
[data-year] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .06em;
}

.text-mute { color: var(--c-mute); }

.display-title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -.02em;
  line-height: 1.06;
  font-size: clamp(2.2rem, 6vw, 4.6rem);
  color: var(--c-fog);
  margin: 0;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-dawn);
  margin: 0 0 12px;
}

.lede {
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.75;
  color: var(--c-mute);
  max-width: 40ch;
  margin: 18px 0 0;
}

/* ---------- 5. focus ---------- */
:focus-visible {
  outline: 2px solid var(--c-cyan);
  outline-offset: 2px;
  border-radius: 6px;
}

/* ---------- 6. skip link ---------- */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -120px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius-pill);
  background: var(--c-cyan);
  color: #04161A;
  font-weight: 600;
  text-decoration: none;
  transition: top .22s var(--ease);
}

.skip-link:focus {
  top: 14px;
}

/* ---------- 7. header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(6, 10, 18, .88);
  border-bottom: 1px solid var(--c-line);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.header-upper {
  background: linear-gradient(90deg, rgba(36, 28, 58, .62), rgba(13, 22, 38, .28) 68%, rgba(255, 122, 47, .07));
  border-bottom: 1px solid rgba(30, 42, 66, .72);
}

.header-upper__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap);
  padding-block: 14px;
  transition: padding-block .32s var(--ease);
}

.site-header[data-scrolled] .header-upper__inner { padding-block: 6px; }
.site-header[data-scrolled] .brand__statement,
.site-header[data-scrolled] .header-utility { display: none; }

.header-upper__side {
  display: flex;
  align-items: center;
  gap: 18px;
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  text-decoration: none;
  color: inherit;
  min-width: 0;
}

.brand__mark {
  flex: none;
  width: 26px;
  height: 26px;
  border-radius: 9px;
  background: linear-gradient(140deg, var(--c-dawn), var(--c-dawn-soft) 46%, var(--c-cyan));
  box-shadow: 0 0 0 1px rgba(233, 239, 248, .14), 0 6px 18px rgba(255, 122, 47, .22);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 1px;
  min-width: 0;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: .01em;
  color: var(--c-fog);
  white-space: nowrap;
}

.brand__statement {
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--c-mute);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex: none;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(61, 224, 208, .3);
  background: rgba(61, 224, 208, .08);
  color: #9FF0E6;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .72rem;
  letter-spacing: .04em;
  white-space: nowrap;
}

.status-pill__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-pulse);
  animation: status-pulse 2.8s ease-out infinite;
}

.header-utility {
  display: flex;
  align-items: center;
  gap: 18px;
}

.header-utility__link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: .8rem;
  color: var(--c-mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .24s var(--ease), border-color .24s var(--ease);
}

.header-utility__link:hover {
  color: var(--c-cyan);
  border-bottom-color: rgba(61, 224, 208, .5);
}

/* lower band */
.header-lower {
  position: relative;
  background: rgba(13, 22, 38, .9);
}

.header-lower__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--gap);
}

/* ---------- 8. navigation ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 46px;
  padding: 0 16px 0 13px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-pill);
  background: rgba(233, 239, 248, .04);
  color: var(--c-fog);
  font-size: .88rem;
  cursor: pointer;
  transition: border-color .24s var(--ease), color .24s var(--ease), background-color .24s var(--ease);
}

.nav-toggle:hover {
  border-color: rgba(61, 224, 208, .45);
  color: var(--c-cyan);
}

.nav-toggle[aria-expanded="true"] {
  border-color: rgba(61, 224, 208, .6);
  background: rgba(61, 224, 208, .1);
  color: var(--c-cyan);
}

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

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
}

.nav-toggle__label {
  font-family: var(--font-mono);
  letter-spacing: .08em;
}

.site-nav {
  display: flex;
  align-items: center;
  flex: 1;
  gap: var(--gap);
  min-width: 0;
}

.nav-primary {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: clamp(10px, 1.6vw, 26px);
}

.nav-primary__item { display: flex; }

.nav-primary__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 56px;
  padding: 0 2px;
  color: var(--c-mute);
  font-size: .92rem;
  text-decoration: none;
  transition: color .24s var(--ease);
}

.nav-primary__link:hover { color: var(--c-fog); }

.nav-primary__link[aria-current="page"] { color: var(--c-fog); }

.nav-primary__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 12px;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-cyan);
}

.nav-aside {
  position: relative;
  display: flex;
  align-items: center;
  margin-left: auto;
}

.nav-aside__title {
  display: none;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-mute);
}

.nav-aside__desc {
  display: none;
  font-size: .84rem;
  line-height: 1.75;
  color: var(--c-mute);
}

.nav-aside__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 0 18px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 122, 47, .38);
  background: rgba(255, 122, 47, .1);
  color: var(--c-dawn-soft);
  font-size: .82rem;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color .24s var(--ease), color .24s var(--ease), border-color .24s var(--ease), transform .24s var(--ease);
}

.nav-aside__link:hover {
  background: rgba(255, 122, 47, .18);
  color: var(--c-fog);
  transform: translateY(-2px);
}

@media (min-width: 900px) {
  .nav-aside:hover .nav-aside__desc,
  .nav-aside:focus-within .nav-aside__desc {
    display: block;
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    width: 268px;
    padding: 14px 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--c-line);
    background: rgba(13, 22, 38, .98);
    box-shadow: 0 22px 48px rgba(0, 0, 0, .55);
    z-index: 8;
  }
}

/* ---------- 9. buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: .9rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: transform .24s var(--ease), background-color .24s var(--ease), border-color .24s var(--ease), color .24s var(--ease);
}

.btn--primary {
  background: linear-gradient(135deg, var(--c-dawn), var(--c-dawn-soft));
  color: #1A0C03;
  font-weight: 600;
}

.btn--primary:hover { transform: translateY(-2px); }

.btn--ghost {
  border-color: var(--c-line);
  background: rgba(233, 239, 248, .03);
  color: var(--c-fog);
}

.btn--ghost:hover {
  border-color: rgba(61, 224, 208, .5);
  background: rgba(61, 224, 208, .07);
  color: var(--c-cyan);
  transform: translateY(-2px);
}

/* ---------- 10. footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  padding-block: clamp(40px, 6vw, 68px) 28px;
  background: linear-gradient(180deg, rgba(13, 22, 38, .92), rgba(6, 10, 18, 1) 72%);
  border-top: 1px solid var(--c-line);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 122, 47, .6) 18%, rgba(61, 224, 208, .5) 62%, transparent);
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--c-line);
}

.footer-brand {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -.01em;
  font-size: clamp(1.1rem, 2.4vw, 1.55rem);
  color: var(--c-fog);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 32px;
  padding-block: clamp(28px, 4vw, 40px);
}

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

.footer-col__title {
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-mute);
  margin: 0 0 14px;
}

.footer-list {
  display: grid;
  gap: 10px;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  font-size: .9rem;
  color: rgba(233, 239, 248, .82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .24s var(--ease), border-color .24s var(--ease);
}

.footer-link:hover {
  color: var(--c-cyan);
  border-bottom-color: rgba(61, 224, 208, .45);
}

.footer-link[aria-current="page"] {
  color: var(--c-cyan);
  border-bottom-color: rgba(61, 224, 208, .45);
}

.footer-lines {
  display: grid;
  gap: 8px;
  font-size: .86rem;
  line-height: 1.7;
  color: var(--c-mute);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  padding-top: 20px;
  border-top: 1px solid var(--c-line);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .76rem;
  letter-spacing: .05em;
  color: var(--c-mute);
}

.footer-note {
  margin-top: 12px;
  max-width: 62ch;
  font-size: .78rem;
  line-height: 1.75;
  color: #6F7F99;
}

/* ---------- 11. layout ---------- */
.container {
  width: min(calc(100% - 2 * var(--gutter)), 1440px);
  margin-inline: auto;
}

.container--narrow {
  width: min(calc(100% - 2 * var(--gutter)), 860px);
  margin-inline: auto;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.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-9  { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: var(--gap);
  align-items: start;
}

.frame {
  position: relative;
  padding: clamp(20px, 3vw, 40px);
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  background: rgba(13, 22, 38, .5);
}

.frame--ruled { padding-left: clamp(44px, 5vw, 66px); }

.frame--ruled::before {
  content: "";
  position: absolute;
  left: clamp(20px, 2.4vw, 30px);
  top: clamp(20px, 3vw, 40px);
  bottom: clamp(20px, 3vw, 40px);
  width: 1px;
  background-image: repeating-linear-gradient(180deg, rgba(147, 163, 188, .55) 0 1px, transparent 1px 12px);
}

.section { padding-block: clamp(38px, 6vw, 78px); }

.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 24px;
}

.section__title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -.02em;
  font-size: clamp(1.4rem, 3vw, 2.1rem);
  color: var(--c-fog);
  margin: 0;
}

.hairline {
  height: 1px;
  border: 0;
  margin: clamp(28px, 4vw, 54px) 0;
  background: linear-gradient(90deg, transparent, var(--c-line) 12%, var(--c-line) 88%, transparent);
}

/* ---------- 12. breadcrumb ---------- */
.breadcrumb { margin: clamp(18px, 3vw, 28px) 0 0; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: .8rem;
  color: var(--c-mute);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: rgba(30, 42, 66, .95);
}

.breadcrumb__link {
  color: var(--c-mute);
  text-decoration: none;
  transition: color .24s var(--ease);
}

.breadcrumb__link:hover { color: var(--c-cyan); }

/* ---------- 13. components ---------- */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-line);
  background: rgba(233, 239, 248, .03);
  color: var(--c-mute);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .74rem;
  letter-spacing: .05em;
  white-space: nowrap;
}

.pill--dawn {
  border-color: rgba(255, 122, 47, .42);
  background: rgba(255, 122, 47, .1);
  color: var(--c-dawn-soft);
}

.pill--cyan {
  border-color: rgba(61, 224, 208, .38);
  background: rgba(61, 224, 208, .1);
  color: #9FF0E6;
}

.pill--pulse {
  border-color: rgba(200, 244, 91, .42);
  background: rgba(200, 244, 91, .12);
  color: var(--c-pulse);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--c-line);
  background: rgba(233, 239, 248, .02);
  color: var(--c-mute);
  font-size: .82rem;
  text-decoration: none;
  cursor: pointer;
  transition: color .24s var(--ease), border-color .24s var(--ease), background-color .24s var(--ease);
}

.tag:hover,
.tag[aria-pressed="true"] {
  color: var(--c-fog);
  border-color: rgba(61, 224, 208, .5);
  background: rgba(61, 224, 208, .09);
}

.index-list { border-top: 1px solid var(--c-line); }

.index-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 16px;
  padding: 16px 6px;
  border-bottom: 1px solid var(--c-line);
  transition: background-color .26s var(--ease), transform .26s var(--ease);
}

.index-item:hover {
  background: rgba(61, 224, 208, .05);
  transform: translateX(3px);
}

.index-item__meta {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--c-mute);
  white-space: nowrap;
}

.index-item__title {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--c-fog);
}

.index-item__title a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .24s var(--ease), color .24s var(--ease);
}

.index-item__title a:hover {
  color: var(--c-cyan);
  border-bottom-color: rgba(61, 224, 208, .45);
}

.stat { display: grid; gap: 6px; }

.stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.1;
  letter-spacing: .04em;
  color: var(--c-pulse);
}

.stat__label {
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--c-mute);
}

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--c-line);
  background: linear-gradient(160deg, var(--c-violet), var(--c-indigo));
  aspect-ratio: 16 / 10;
}

.media-frame > img,
.media-frame > video,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.prose {
  max-width: 68ch;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--c-body);
}

.prose > * + * { margin-top: 1.1em; }

.prose h2,
.prose h3 {
  font-family: var(--font-display);
  color: var(--c-fog);
  letter-spacing: -.01em;
  line-height: 1.3;
}

.prose h2 { font-size: clamp(1.25rem, 2.4vw, 1.6rem); margin-top: 1.9em; }
.prose h3 { font-size: 1.06rem; margin-top: 1.6em; }

.prose a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 224, 208, .35);
  transition: border-color .24s var(--ease);
}

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

.prose strong { color: var(--c-fog); }

.prose ul,
.prose ol {
  list-style: disc;
  padding-left: 1.25em;
  display: grid;
  gap: .5em;
}

.prose ol { list-style: decimal; }

/* ---------- 14. motion layers (JS 注入) ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 90;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-dawn), var(--c-pulse) 52%, var(--c-cyan));
}

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 80;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid var(--c-line);
  border-radius: 50%;
  background: rgba(13, 22, 38, .92);
  color: var(--c-fog);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .28s var(--ease), transform .28s var(--ease), visibility .28s linear, border-color .24s var(--ease), color .24s var(--ease);
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover {
  border-color: rgba(61, 224, 208, .6);
  color: var(--c-cyan);
}

.to-top__icon {
  font-size: 1.05rem;
  line-height: 1;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 15. responsive ---------- */
@media (max-width: 1023px) {
  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .span-7, .span-8, .span-9 { grid-column: span 12; }
}

@media (max-width: 899px) {
  .header-utility { display: none; }

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

  .header-lower__inner { padding-block: 8px; }

  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 9;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    max-height: calc(100vh - 96px);
    overflow-y: auto;
    padding: 10px var(--gutter) 28px;
    background: rgba(6, 10, 18, .98);
    border-bottom: 1px solid var(--c-line);
    box-shadow: 0 26px 50px rgba(0, 0, 0, .55);
  }

  .site-nav[data-open] { display: flex; }

  .nav-primary {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-primary__item { border-bottom: 1px solid var(--c-line); }

  .nav-primary__link {
    width: 100%;
    justify-content: space-between;
    min-height: 54px;
    font-size: 1rem;
    color: var(--c-fog);
  }

  .nav-primary__link[aria-current="page"] { color: var(--c-cyan); }

  .nav-primary__link[aria-current="page"]::after {
    left: auto;
    right: 2px;
    bottom: 50%;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    transform: translateY(50%);
  }

  .nav-aside {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin: 20px 0 0;
  }

  .nav-aside__title { display: block; }
  .nav-aside__desc { display: block; max-width: 44ch; }

  .nav-aside__link {
    width: 100%;
    min-height: 48px;
  }

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

@media (max-width: 639px) {
  .span-3, .span-4, .span-5, .span-6 { grid-column: span 12; }

  .brand__statement {
    max-width: 44vw;
    font-size: .68rem;
  }

  .status-pill {
    padding: 5px 10px;
    font-size: .66rem;
  }

  .frame { border-radius: var(--radius-md); }

  .footer-top { align-items: flex-start; }
}

/* ---------- 16. reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  body::before { animation: none; }

  .status-pill__dot { animation: none; }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .btn,
  .footer-link,
  .header-utility__link,
  .nav-aside__link,
  .index-item,
  .nav-toggle { transition: color .2s linear, border-color .2s linear, background-color .2s linear; }

  .btn:hover,
  .btn--ghost:hover,
  .nav-aside__link:hover,
  .index-item:hover { transform: none; }
}