/* ============================================================
   百胜游戏站 / GAME-BS — 共享外壳样式表
   /assets/site.css
   ============================================================ */

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

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

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

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

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

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #0B1026;
  --ink-2: #141B3C;
  --ink-3: #1B2447;
  --rock: #343B4A;
  --paper: #F4EFE3;
  --cyan: #42F5E6;
  --orange: #FF6A3D;
  --gold: #B98A2F;
  --moss: #7C9A72;
  --clay: #C66B4E;
  --mist: #9DB9C7;

  --line: rgba(157, 185, 199, 0.18);
  --line-strong: rgba(157, 185, 199, 0.34);

  --rail-w: 76px;
  --shell: 1280px;
  --gutter: clamp(18px, 3vw, 44px);

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace,
    SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC",
    "SimSun", serif;

  --dur: 0.16s;
  --ease: cubic-bezier(0.34, 0.72, 0.32, 1);
}

/* ---------- 3. Base ---------- */
body {
  min-height: 100vh;
  padding-left: var(--rail-w);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(157, 185, 199, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(157, 185, 199, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), rgba(0, 0, 0, 0.15) 72%, transparent);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.95), rgba(0, 0, 0, 0.15) 72%, transparent);
}

body.nav-open { overflow: hidden; }

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

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

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. Typography ---------- */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 800; line-height: 1.14; }

.display-1,
.display-2,
.display-3 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.005em;
  transform: skewX(-7deg);
  transform-origin: left center;
  color: var(--paper);
}

.display-1 { font-size: clamp(2.6rem, 6.4vw, 4.5rem); }
.display-2 { font-size: clamp(2.05rem, 4.6vw, 3.5rem); }
.display-3 { font-size: clamp(1.55rem, 3.1vw, 2.5rem); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--cyan);
}

.lede {
  max-width: 62ch;
  font-size: clamp(1rem, 1.25vw, 1.125rem);
  line-height: 1.85;
  color: var(--mist);
}

.note {
  font-family: var(--font-serif);
  font-size: 13px;
  line-height: 1.7;
  color: var(--clay);
  border-left: 1px solid var(--gold);
  padding-left: 10px;
}

code, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.02em;
}

/* ---------- 5. Layout helpers ---------- */
.shell {
  width: min(var(--shell), 100%);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(40px, 6vw, 88px); }

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 28px);
}
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* ---------- 6. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 300;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ink);
  background: var(--cyan);
  border: 1px solid var(--cyan);
  transform: translateY(-180%);
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 7. Scroll progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 200;
  pointer-events: none;
  background: rgba(52, 59, 74, 0.5);
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--orange) 68%, var(--gold) 100%);
  transition: transform 0.08s linear;
}

/* ---------- 8. Side rail / header ---------- */
.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 16px 0 14px;
  background: linear-gradient(180deg, #0C1229 0%, #141B3C 55%, #0B1026 100%);
  border-right: 1px solid var(--line);
}

.rail::after {
  content: "";
  position: absolute;
  top: 0;
  right: -1px;
  bottom: 0;
  width: 1px;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(66, 245, 230, 0.55) 22%,
    rgba(255, 106, 61, 0.5) 78%,
    transparent 100%
  );
  opacity: 0.65;
}

/* brand */
.rail__brand {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.rail__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1;
  color: var(--ink);
  background: var(--cyan);
  transform: skewX(-7deg);
  box-shadow:
    0 0 0 1px rgba(66, 245, 230, 0.35),
    0 0 22px rgba(66, 245, 230, 0.16);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease), color var(--dur) var(--ease);
}

.rail__brand:hover .rail__mark,
.rail__brand:focus-visible .rail__mark {
  background: var(--orange);
  color: var(--ink);
  box-shadow:
    0 0 0 1px rgba(255, 106, 61, 0.55),
    0 0 26px rgba(255, 106, 61, 0.28);
}

.rail__wordmark {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.34em;
  color: var(--mist);
}

/* toggle */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--paper);
  border: 1px solid var(--line-strong);
  border-radius: 0;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars > span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(2) {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* nav */
.primary-nav {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 6px 0;
  overflow-y: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.primary-nav::-webkit-scrollbar { display: none; }

.primary-nav__head { display: none; }

.primary-nav__list {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.primary-nav__item { display: block; }

.primary-nav__link {
  display: block;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  padding: 8px 5px;
  font-size: 12.5px;
  line-height: 1.2;
  letter-spacing: 0.14em;
  color: var(--mist);
  border: 1px solid transparent;
  border-radius: 0;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.primary-nav__link:hover,
.primary-nav__link:focus-visible {
  color: var(--paper);
  background: rgba(244, 239, 227, 0.06);
  border-color: var(--line-strong);
}

.primary-nav__link[aria-current="page"] {
  color: var(--cyan);
  background: rgba(66, 245, 230, 0.1);
  border-color: rgba(66, 245, 230, 0.6);
}

.primary-nav__idx { display: none; }

.primary-nav__label { display: inline; }

.primary-nav__cta {
  display: block;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  padding: 12px 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--ink);
  background: var(--orange);
  border: 1px solid var(--orange);
  border-radius: 0;
  box-shadow: 0 0 0 1px rgba(255, 106, 61, 0.25);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.primary-nav__cta:hover,
.primary-nav__cta:focus-visible {
  color: var(--orange);
  background: transparent;
  box-shadow: 0 0 20px rgba(255, 106, 61, 0.3);
}

.rail__foot {
  flex: 0 0 auto;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.3em;
  color: rgba(157, 185, 199, 0.5);
}

/* scrim */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 85;
  display: none;
  background: rgba(6, 9, 22, 0.74);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--dur) var(--ease);
}

/* ---------- 9. Buttons / chips / panels ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  line-height: 1;
  color: var(--paper);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.btn:hover,
.btn:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  transform: translateY(-2px);
}

.btn--primary {
  color: var(--ink);
  background: var(--orange);
  border-color: var(--orange);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  color: var(--orange);
  background: transparent;
  border-color: var(--orange);
}

.btn--ghost {
  color: var(--mist);
  border-color: var(--line);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--mist);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 0;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

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

.chip[aria-pressed="true"],
.chip[data-active="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  background: linear-gradient(165deg, rgba(20, 27, 60, 0.95), rgba(11, 16, 38, 0.95));
  border: 1px solid var(--line);
  border-radius: 0;
}

.panel--gold {
  border-color: rgba(185, 138, 47, 0.5);
  box-shadow: inset 0 0 0 1px rgba(185, 138, 47, 0.12);
}

/* ---------- 10. Breadcrumbs ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: rgba(157, 185, 199, 0.75);
}

.crumbs a { color: var(--mist); border-bottom: 1px solid transparent; }
.crumbs a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.crumbs__sep { color: var(--rock); }
.crumbs [aria-current="page"] { color: var(--paper); }

/* ---------- 11. Prose ---------- */
.prose {
  max-width: 68ch;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: rgba(244, 239, 227, 0.86);
}

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

.prose h2,
.prose h3 {
  color: var(--paper);
  margin-top: 2.1em;
  line-height: 1.3;
}
.prose h2 { font-size: clamp(1.35rem, 2.2vw, 1.75rem); }
.prose h3 { font-size: clamp(1.1rem, 1.7vw, 1.3rem); }

.prose ul,
.prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: 0.4em; }

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(66, 245, 230, 0.4);
}
.prose a:hover { border-bottom-color: var(--cyan); }

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

/* ---------- 12. Media containers ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(150deg, #141B3C, #0B1026);
  border: 1px solid var(--line);
  border-radius: 0;
}

.media > img,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.88) contrast(1.06) brightness(0.92);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(120% 92% at 50% 0%, transparent 42%, rgba(5, 8, 20, 0.74) 100%),
    linear-gradient(115deg, transparent 0 66%, rgba(66, 245, 230, 0.14) 66% 66.5%, transparent 66.5%);
}

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

.media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: rgba(157, 185, 199, 0.75);
}

/* ---------- 13. Footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 128px);
  overflow: hidden;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(20, 27, 60, 0.94) 0%, #090D1F 100%);
  color: var(--paper);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    97deg,
    rgba(66, 245, 230, 0.055) 0 1px,
    transparent 1px 96px
  );
}

.site-footer::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(90deg, var(--cyan), rgba(66, 245, 230, 0) 42%, rgba(255, 106, 61, 0) 58%, var(--orange));
  opacity: 0.8;
}

.footer-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(24px, 3.5vw, 56px);
  width: min(var(--shell), 100%);
  margin-inline: auto;
  padding: clamp(40px, 6vw, 80px) var(--gutter) clamp(32px, 4vw, 60px);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-brand__line {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2vw, 26px);
  letter-spacing: 0.02em;
  color: var(--paper);
  transform: skewX(-7deg);
  transform-origin: left center;
}

.footer-brand__line small {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.footer-brand__statement {
  max-width: 34ch;
  margin-top: 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

.footer-brand__cta {
  display: inline-block;
  margin-top: 22px;
  padding: 11px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink);
  background: var(--orange);
  border: 1px solid var(--orange);
  border-radius: 0;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.footer-brand__cta:hover,
.footer-brand__cta:focus-visible {
  color: var(--orange);
  background: transparent;
}

.footer-col__title {
  padding-bottom: 12px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  border-bottom: 1px solid var(--line);
}

.footer-col__list {
  display: grid;
  gap: 10px;
  font-size: 14px;
}

.footer-col__list a {
  display: inline-block;
  padding-bottom: 2px;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-col__list a:hover,
.footer-col__list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
  transform: translateX(2px);
}

.footer-contact { font-size: 14px; color: var(--mist); }

.footer-contact__row {
  display: grid;
  gap: 2px;
  margin-bottom: 12px;
}

.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: rgba(157, 185, 199, 0.65);
}

.footer-contact__val {
  font-size: 14px;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.footer-contact__note {
  margin-top: 14px;
  padding-left: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(157, 185, 199, 0.72);
  border-left: 1px solid var(--gold);
}

.footer-base {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: min(var(--shell), 100%);
  margin-inline: auto;
  padding: 18px var(--gutter) 30px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: rgba(157, 185, 199, 0.62);
  border-top: 1px solid var(--line);
}

.footer-base__copy,
.footer-base__icp { margin: 0; }

.footer-base__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.footer-base__legal a {
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.footer-base__legal a:hover,
.footer-base__legal a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 14. Desktop fallback for short viewports ---------- */
@media (min-width: 961px) and (max-height: 820px) {
  .rail__mark { width: 32px; height: 32px; font-size: 16px; }
  .primary-nav { gap: 8px; }
  .primary-nav__list { gap: 5px; }
  .primary-nav__link { font-size: 12px; letter-spacing: 0.1em; padding: 6px 4px; }
  .primary-nav__cta { font-size: 11px; letter-spacing: 0.12em; padding: 9px 5px; }
}

/* ---------- 15. Mobile / tablet ---------- */
@media (max-width: 960px) {
  body { padding-left: 0; }

  .skip-link { left: 12px; }

  .rail {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: 100%;
    height: 64px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 0 16px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .rail::after { display: none; }

  .rail__brand { flex-direction: row; align-items: center; gap: 10px; }

  .rail__mark { width: 30px; height: 30px; font-size: 15px; }

  .rail__wordmark {
    writing-mode: horizontal-tb;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.14em;
    color: var(--paper);
  }

  .rail__foot { display: none; }

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

  .primary-nav {
    position: fixed;
    top: 64px;
    left: 0;
    bottom: 0;
    width: min(86vw, 336px);
    padding: 22px 20px 26px;
    gap: 16px;
    align-items: stretch;
    background: linear-gradient(180deg, #101736 0%, #0B1026 100%);
    border-right: 1px solid var(--line-strong);
    transform: translateX(-104%);
    transition: transform 0.3s var(--ease);
    overflow-y: auto;
    z-index: 88;
  }

  .rail[data-open="true"] .primary-nav { transform: translateX(0); }

  .primary-nav__head {
    display: block;
    padding-bottom: 10px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.22em;
    color: var(--cyan);
    border-bottom: 1px solid var(--line);
  }

  .primary-nav__list { gap: 0; align-items: stretch; }

  .primary-nav__link {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 14px;
    writing-mode: horizontal-tb;
    text-orientation: mixed;
    padding: 15px 2px;
    font-size: 15px;
    letter-spacing: 0.06em;
    color: var(--paper);
    border: 0;
    border-bottom: 1px solid var(--line);
  }

  .primary-nav__link:hover,
  .primary-nav__link:focus-visible {
    color: var(--cyan);
    background: rgba(66, 245, 230, 0.08);
    border-color: var(--line);
  }

  .primary-nav__link[aria-current="page"] {
    color: var(--cyan);
    background: rgba(66, 245, 230, 0.1);
    border-color: var(--line);
    border-bottom-color: var(--cyan);
  }

  .primary-nav__idx {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.08em;
    color: var(--orange);
  }

  .primary-nav__cta {
    writing-mode: horizontal-tb;
    text-orientation: mixed;
    margin-top: 6px;
    padding: 14px;
    font-size: 14px;
    text-align: center;
  }

  .nav-scrim { display: block; }

  .rail[data-open="true"] ~ .nav-scrim {
    opacity: 1;
    pointer-events: auto;
  }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 1080px) and (min-width: 961px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .footer-base { flex-direction: column; align-items: flex-start; gap: 10px; }
  .footer-base__legal { gap: 14px; }
  .display-1 { font-size: clamp(2.1rem, 9vw, 2.6rem); }
  .display-2 { font-size: clamp(1.7rem, 7vw, 2.15rem); }
  .display-3 { font-size: clamp(1.35rem, 6vw, 1.65rem); }
}

/* ---------- 16. 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;
    scroll-behavior: auto !important;
  }

  .primary-nav { transition: none; }
  .rail[data-open="true"] .primary-nav { transform: none; }
  .btn:hover,
  .btn:focus-visible { transform: none; }
  .footer-col__list a:hover,
  .footer-col__list a:focus-visible { transform: none; }
}