/* ============================================================
   BIYING CHAMPION · shared site kit  /assets/site.css
   shell = index rail + command bar + archive footer
   ============================================================ */

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

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

body { margin: 0; }

h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
main { display: block; }

:root {
  /* — mineral palette — */
  --ink: #0B1F33;
  --ink-2: #132C44;
  --ink-3: #091A2A;
  --paper: #F4F0E6;
  --mist: #DDE8DF;
  --stone: #3E4A52;
  --moss: #6F8F7A;
  --cyan: #23D5E6;
  --cyan-ink: #0E7C87;
  --orange: #FF8A3D;
  --orange-ink: #B3541E;
  --violet-a: #7B4DFF;
  --violet-b: #C44DFF;
  --clay: #B46A4F;
  --text-light: #E9F1F5;

  /* — hairlines — */
  --hair-light: 1px solid rgba(233, 241, 245, 0.14);
  --hair-dark: 1px solid rgba(11, 31, 51, 0.14);

  /* — type stacks (system only, no remote fonts) — */
  --font-display: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-heading: "Noto Sans SC", "Source Han Sans SC", "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  /* — form — */
  --r-s: 4px;
  --r-m: 14px;
  --r-l: 28px;
  --shell: min(1240px, 100% - clamp(1.25rem, 5vw, 5rem));
  --sp-section: clamp(3.5rem, 8vw, 7rem);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

body {
  font-family: var(--font-body);
  font-size: clamp(0.95rem, 0.92rem + 0.15vw, 1.05rem);
  line-height: 1.75;
  color: var(--stone);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.shell {
  width: var(--shell);
  margin-inline: auto;
}

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

/* ============================================================
   1 · HEADER — index rail + command bar
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 70;
  background: var(--ink);
  color: var(--text-light);
  border-bottom: 1px solid rgba(35, 213, 230, 0.22);
  box-shadow: 0 14px 32px -26px rgba(0, 0, 0, 0.95);
}

.skip-link {
  position: fixed;
  left: 1rem;
  top: 0.5rem;
  z-index: 200;
  transform: translateY(-220%);
  padding: 0.55rem 0.95rem;
  border-radius: var(--r-s);
  background: var(--orange);
  color: #20130A;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: transform 0.2s var(--ease);
}

.skip-link:focus {
  transform: translateY(0);
}

.cmd-rail {
  background: var(--ink-3);
  border-bottom: 1px solid rgba(233, 241, 245, 0.07);
}

.cmd-rail__inner {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.5rem);
  padding-block: 0.42rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(233, 241, 245, 0.52);
  white-space: nowrap;
  overflow: hidden;
}

.cmd-rail__mark {
  color: rgba(35, 213, 230, 0.85);
}

.cmd-rail__tagline {
  padding-left: clamp(0.75rem, 2vw, 1.5rem);
  border-left: 1px solid rgba(233, 241, 245, 0.16);
}

.cmd-rail__status {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: rgba(233, 241, 245, 0.62);
}

.cmd-rail__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 138, 61, 0.16);
}

.cmd-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 3vw, 2rem);
  padding-block: 0.7rem;
}

/* — brand lockup — */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--text-light);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: 0 0 auto;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1;
  color: var(--ink);
  background: var(--cyan);
  border-radius: 10px 4px 10px 4px;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand__name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.02rem;
  letter-spacing: 0.02em;
}

.brand__sub {
  margin-top: 0.28rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: rgba(233, 241, 245, 0.5);
}

/* — mobile toggle — */
.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.72rem;
  border: 1px solid rgba(233, 241, 245, 0.24);
  border-radius: var(--r-s);
  color: var(--text-light);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  cursor: pointer;
}

.nav-toggle:hover {
  border-color: rgba(35, 213, 230, 0.7);
}

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

.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  background: var(--cyan);
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child {
  transform: translateY(2.75px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child {
  transform: translateY(-2.75px) rotate(-45deg);
}

/* — navigation — */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(0.5rem, 2vw, 1.6rem);
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.1rem, 1vw, 0.9rem);
}

.site-nav__list a {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.36rem;
  padding: 0.55rem 0.5rem 0.62rem;
  text-decoration: none;
  color: rgba(233, 241, 245, 0.74);
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.88rem;
  transition: color 0.18s var(--ease);
}

.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 0.5rem;
  right: 0.5rem;
  bottom: 0.26rem;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s var(--ease);
}

.site-nav__list a:hover {
  color: #ffffff;
}

.site-nav__list a:hover::after {
  transform: scaleX(1);
}

.site-nav__list a[aria-current="page"] {
  color: var(--cyan);
}

.site-nav__list a[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--orange);
}

.site-nav__list a[aria-current="page"] .site-nav__idx {
  color: var(--cyan);
}

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: rgba(255, 138, 61, 0.72);
  transition: color 0.18s var(--ease);
}

.site-nav__list a:hover .site-nav__idx {
  color: var(--cyan);
}

.site-nav__label {
  white-space: nowrap;
}

.site-nav__cta {
  flex: 0 0 auto;
}

/* — buttons — */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.62rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--r-s);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.86rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.btn--cta {
  background: var(--orange);
  color: #20130A;
}

.btn--cta:hover {
  background: #FFA063;
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-light);
  border-color: rgba(233, 241, 245, 0.34);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--quiet {
  background: var(--ink-2);
  color: var(--text-light);
  border-color: rgba(35, 213, 230, 0.32);
}

.btn--quiet:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* — reading progress — */
.scroll-meter {
  height: 2px;
  background: rgba(233, 241, 245, 0.08);
}

.scroll-meter__fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width 0.12s linear;
}

/* ============================================================
   2 · FOOTER — archive block
   ============================================================ */

.site-footer {
  position: relative;
  padding-top: clamp(2.5rem, 5vw, 4rem);
  background: var(--ink);
  color: rgba(233, 241, 245, 0.78);
  border-top: 1px solid rgba(35, 213, 230, 0.2);
  font-size: 0.9rem;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--orange) 52%, var(--violet-a));
  opacity: 0.62;
}

.footer-track {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  width: var(--shell);
  margin-inline: auto;
  padding-bottom: clamp(1.4rem, 3vw, 2.2rem);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(233, 241, 245, 0.45);
}

.footer-track__no {
  color: var(--orange);
}

.footer-track__line {
  flex: 1 1 auto;
  height: 1px;
  background: rgba(233, 241, 245, 0.16);
}

.footer-track__label {
  white-space: nowrap;
}

.footer-grid {
  width: var(--shell);
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.6fr);
  gap: clamp(1.6rem, 4vw, 4rem);
  padding-bottom: clamp(2rem, 4vw, 3.2rem);
}

.brand--footer {
  margin-bottom: 0.2rem;
}

.brand--footer .brand__mark {
  background: var(--ink-2);
  border: 1px solid rgba(35, 213, 230, 0.45);
  color: var(--cyan);
}

.footer-brand__tag {
  margin-top: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--moss);
}

.footer-contact {
  margin-top: 1.4rem;
  display: grid;
  gap: 0.15rem;
}

.contact-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.4rem 0.7rem;
  padding: 0.42rem 0;
  border-bottom: 1px dotted rgba(233, 241, 245, 0.16);
}

.contact-row__key {
  min-width: 3.4rem;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  color: rgba(35, 213, 230, 0.78);
}

.contact-row__val {
  flex: 1 1 auto;
  min-width: 0;
  color: var(--text-light);
  font-size: 0.86rem;
  word-break: break-word;
}

.copy-btn {
  padding: 0.18rem 0.55rem;
  border: 1px solid rgba(35, 213, 230, 0.4);
  border-radius: 999px;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: background 0.18s var(--ease), color 0.18s var(--ease),
    border-color 0.18s var(--ease);
}

.copy-btn:hover {
  background: rgba(35, 213, 230, 0.12);
}

.copy-btn.is-copied {
  border-color: var(--orange);
  color: var(--orange);
  background: rgba(255, 138, 61, 0.12);
}

.footer-note {
  margin-top: 1rem;
  max-width: 36ch;
  font-size: 0.78rem;
  line-height: 1.7;
  color: rgba(233, 241, 245, 0.5);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 3vw, 2.4rem);
}

.footer-col__title {
  margin-bottom: 0.8rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid rgba(233, 241, 245, 0.14);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--moss);
}

.footer-col__list {
  display: grid;
  gap: 0.55rem;
}

.footer-col__list a {
  display: inline-block;
  text-decoration: none;
  color: rgba(233, 241, 245, 0.78);
  font-size: 0.88rem;
  transition: color 0.18s var(--ease), transform 0.18s var(--ease);
}

.footer-col__list a:hover {
  color: var(--cyan);
  transform: translateX(3px);
}

.footer-base {
  width: var(--shell);
  margin-inline: auto;
  padding-block: 1.1rem 1.5rem;
  border-top: 1px solid rgba(233, 241, 245, 0.14);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: rgba(233, 241, 245, 0.45);
}

.footer-base__code {
  color: rgba(233, 241, 245, 0.3);
}

.to-top {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid rgba(233, 241, 245, 0.24);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  color: rgba(233, 241, 245, 0.72);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.24s var(--ease), border-color 0.18s var(--ease),
    color 0.18s var(--ease);
}

.to-top.is-shown {
  opacity: 1;
  pointer-events: auto;
}

.to-top:hover {
  border-color: var(--cyan);
  color: var(--cyan);
}

/* ============================================================
   3 · PAGE BASE — sections, grid, type, media
   ============================================================ */

.section {
  position: relative;
  padding-block: var(--sp-section);
}

.section--tight {
  padding-block: clamp(2rem, 4vw, 3rem);
}

.section--paper {
  background: var(--paper);
  color: var(--stone);
}

.section--mist {
  background: var(--mist);
  color: var(--stone);
}

.section--ink {
  background: var(--ink);
  color: var(--text-light);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--moss);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.section--ink .eyebrow {
  color: var(--cyan);
}

.sec-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--orange-ink);
}

.section--ink .sec-code {
  color: var(--orange);
}

.sec-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(1.35rem, 2.4vw, 1.8rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.section--ink .sec-title {
  color: var(--text-light);
}

.display {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(3.2rem, 8vw, 7.5rem);
  line-height: 0.94;
  letter-spacing: -0.03em;
}

.lede {
  max-width: 62ch;
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  line-height: 1.85;
}

.section--ink .lede {
  color: rgba(233, 241, 245, 0.82);
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

.prose {
  max-width: 66ch;
}

.prose > * + * {
  margin-top: 1rem;
}

.prose h2 {
  margin-top: 2rem;
  font-family: var(--font-heading);
  font-size: clamp(1.25rem, 2vw, 1.6rem);
  line-height: 1.4;
  color: var(--ink);
}

.prose h3 {
  margin-top: 1.6rem;
  font-family: var(--font-heading);
  font-size: 1.05rem;
  color: var(--ink);
}

.prose ul,
.prose ol {
  display: grid;
  gap: 0.5rem;
  padding-left: 1.15rem;
  list-style: disc;
}

.rule {
  height: 1px;
  border: 0;
  background: var(--hair-dark);
  background: rgba(11, 31, 51, 0.14);
}

.rule--light {
  background: rgba(233, 241, 245, 0.16);
}

/* — breadcrumb — */
.breadcrumb {
  padding-block: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  color: rgba(62, 74, 82, 0.72);
}

.breadcrumb__link {
  text-decoration: none;
  color: inherit;
}

.breadcrumb__link:hover {
  color: var(--ink);
  text-decoration: underline;
}

.breadcrumb__sep {
  opacity: 0.5;
}

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

.breadcrumb--light .breadcrumb__list {
  color: rgba(233, 241, 245, 0.55);
}

.breadcrumb--light .breadcrumb__current {
  color: var(--cyan);
}

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

/* — grid — */
.grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 2rem);
}

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

.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; }

/* — tags — */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.22rem 0.62rem;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  line-height: 1.6;
}

.tag--cyan { color: var(--cyan-ink); }
.tag--orange { color: var(--orange-ink); }
.tag--mist {
  color: #4A6152;
  background: rgba(111, 143, 122, 0.16);
  border-color: transparent;
}
.tag--violet { color: #5B34C7; }

.section--ink .tag--cyan { color: var(--cyan); }
.section--ink .tag--orange { color: var(--orange); }

/* — side note — */
.note {
  padding: 0.2rem 0 0.2rem 1rem;
  border-left: 2px solid var(--moss);
  font-size: 0.86rem;
  color: rgba(62, 74, 82, 0.88);
}

.note__key {
  display: block;
  margin-bottom: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--moss);
}

/* — archive panel — */
.panel {
  padding: clamp(1rem, 2vw, 1.5rem);
  background: #FFFFFF;
  border: 1px solid rgba(11, 31, 51, 0.1);
  border-radius: var(--r-m);
}

/* — media containers (page stage puts <img> inside) — */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-m);
  background: linear-gradient(160deg, var(--mist), #EDE7DA);
}

.media--wide { aspect-ratio: 16 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }

.media--violet {
  background: linear-gradient(135deg, var(--violet-a), var(--violet-b));
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__cap {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: rgba(62, 74, 82, 0.7);
}

.section--ink .media__cap {
  color: rgba(233, 241, 245, 0.6);
}

/* — reveal on scroll — */
@keyframes bv-reveal {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

[data-reveal].is-visible {
  animation: bv-reveal 0.4s var(--ease) both;
}

/* ============================================================
   4 · RESPONSIVE
   ============================================================ */

@media (max-width: 1080px) {
  .site-nav__list a { font-size: 0.84rem; padding-inline: 0.4rem; }
  .site-nav__list a::after { left: 0.4rem; right: 0.4rem; }
}

@media (max-width: 960px) {
  .cmd-rail__tagline,
  .cmd-rail__status { display: none; }

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

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    margin: 0;
    display: block;
    max-height: 82vh;
    overflow-y: auto;
    padding: 1.1rem 1.1rem calc(1.1rem + env(safe-area-inset-bottom, 0px));
    background: var(--ink-2);
    border-top: 1px solid rgba(35, 213, 230, 0.34);
    border-radius: var(--r-l) var(--r-l) 0 0;
    box-shadow: 0 -26px 60px -30px rgba(0, 0, 0, 0.92);
    transform: translateY(102%);
    visibility: hidden;
    transition: transform 0.3s var(--ease), visibility 0.3s var(--ease);
  }

  .site-nav[data-open] {
    transform: translateY(0);
    visibility: visible;
  }

  .site-nav__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 0.75rem;
  }

  .site-nav__list li {
    border-bottom: 1px solid rgba(233, 241, 245, 0.1);
  }

  .site-nav__list a {
    display: flex;
    width: 100%;
    padding: 0.85rem 0.2rem;
    font-size: 0.95rem;
  }

  .site-nav__list a::after {
    display: none;
  }

  .site-nav__list a[aria-current="page"] {
    padding-left: 0.6rem;
    box-shadow: inset 2px 0 0 var(--cyan);
  }

  .site-nav__cta {
    width: 100%;
    margin-top: 1rem;
    padding-block: 0.85rem;
  }

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

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

  .grid--12 {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .col-4,
  .col-5,
  .col-7,
  .col-8 {
    grid-column: span 6;
  }
}

@media (max-width: 560px) {
  .cmd-rail__inner {
    font-size: 0.6rem;
    letter-spacing: 0.12em;
  }

  .brand__sub { display: none; }

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

  .footer-base {
    font-size: 0.62rem;
    gap: 0.5rem 1rem;
  }

  .to-top { margin-left: 0; }

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

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

/* ============================================================
   5 · 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;
  }

  [data-reveal].is-visible {
    animation: none;
  }

  .site-nav {
    transition: none;
  }
}