/* ============================================================
   九娱乐空间 · /assets/site.css
   深靛蓝底 + 霓虹青 / 电光紫 / 暖橙 · 堆叠面板 · 精密网格
   ============================================================ */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
  background-color: var(--bg);
}
body, h1, h2, h3, h4, p, ul, ol, li, figure, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; }

/* ---------- tokens ---------- */
:root {
  --bg: #0B1026;
  --panel: #141B3A;
  --card: #1E2954;
  --cyan: #33E6FF;
  --violet: #8B5CFF;
  --orange: #FF9F43;
  --ink: #F4F7FF;
  --muted: #A8B4D8;
  --line: #2E3D73;
  --ok: #3DDC97;
  --warn: #FF6B6B;

  --header-h: 72px;
  --shell: 1240px;
  --radius: 2px;
  --gap: clamp(16px, 2.4vw, 28px);
  --pad: clamp(20px, 3vw, 40px);
  --font-sans: "Noto Sans SC", "HarmonyOS Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- base ---------- */
body {
  min-height: 100%;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  color: var(--ink);
  background-color: transparent;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(1100px 640px at 6% -8%, rgba(51, 230, 255, .17), transparent 62%),
    radial-gradient(920px 580px at 97% 2%, rgba(139, 92, 255, .21), transparent 66%),
    linear-gradient(180deg, rgba(139, 92, 255, .07), transparent 44%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .5;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 84px 84px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .6), transparent 68%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .6), transparent 68%);
}

h1, h2, h3, h4 {
  font-weight: 900;
  letter-spacing: .02em;
  line-height: 1.22;
  color: var(--ink);
}
h1 { font-size: clamp(2.1rem, 6vw, 4rem); }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.35rem); }
h3 { font-size: clamp(1.1rem, 1.8vw, 1.35rem); }

time, .num, [data-num], .ledger td, .footer-contact__v {
  font-variant-numeric: tabular-nums;
}

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

main { display: block; padding-top: var(--header-h); }
main.main--bleed { padding-top: 0; }

/* ---------- layout utilities ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-inline: clamp(16px, 3vw, 32px);
}
.shell--narrow { max-width: 820px; }

.section { padding-block: clamp(38px, 6vw, 84px); }
.section--tight { padding-block: clamp(24px, 3.4vw, 48px); }

.rule { height: 1px; border: 0; margin: 0; background: var(--line); }

.grid { display: grid; gap: var(--gap); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--sidebar { grid-template-columns: minmax(0, 1fr) minmax(230px, 320px); align-items: start; }

.stack { display: flex; flex-direction: column; gap: var(--gap); }
.cluster { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .22em;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

/* ---------- header ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  font-size: .88rem;
  font-weight: 700;
  color: #04101F;
  background: var(--cyan);
  border-radius: var(--radius);
  transform: translateY(-180%);
  transition: transform .18s var(--ease);
}
.skip-link:focus { transform: none; }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  height: var(--header-h);
  display: flex;
  align-items: center;
  background: linear-gradient(180deg, rgba(11, 16, 38, .88), rgba(11, 16, 38, .12));
  border-bottom: 1px solid transparent;
  transition: background-color .28s var(--ease), border-color .28s var(--ease), backdrop-filter .28s var(--ease);
}
.site-header[data-scrolled="true"] {
  background: rgba(11, 16, 38, .95);
  border-bottom-color: var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.site-header[data-scrolled="true"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 48%, transparent 92%);
}
.site-header__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-inline: clamp(16px, 3vw, 32px);
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 30px);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 130;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 58%, var(--orange));
}

/* brand */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  padding: 6px 0;
}
.brand__mark {
  position: relative;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  background: linear-gradient(135deg, var(--cyan), var(--violet));
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
}
.brand__mark::before {
  content: "";
  position: absolute;
  right: 7px;
  top: 7px;
  width: 2px;
  height: 11px;
  background: #04101F;
}
.brand__mark::after {
  content: "";
  position: absolute;
  left: 7px;
  bottom: 7px;
  width: 11px;
  height: 2px;
  background: var(--orange);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: .06em;
  color: var(--ink);
}
.brand__tagline {
  margin-top: 2px;
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--muted);
}

/* nav toggle */
.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 9px;
  padding: 10px 13px;
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--ink);
  background: rgba(30, 41, 84, .65);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); }
.nav-toggle__bars { display: grid; gap: 4px; width: 16px; }
.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: var(--cyan);
  transition: transform .24s var(--ease), opacity .24s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child { transform: translateY(-3px) rotate(-45deg); }
.nav-toggle__label { white-space: nowrap; }

/* nav */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.4vw, 20px);
  margin-left: auto;
}
.site-nav__list { display: flex; align-items: center; gap: clamp(2px, .8vw, 12px); }
.site-nav__item { display: block; }
.site-nav__link {
  position: relative;
  display: block;
  padding: 10px 11px;
  font-size: .92rem;
  letter-spacing: .05em;
  color: var(--muted);
  transition: color .2s var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 4px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform .24s var(--ease), background .24s var(--ease);
}
.site-nav__link:hover { color: var(--ink); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--ink); font-weight: 700; }
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}
.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 3px;
  height: 3px;
  background: var(--orange);
  transform: translateY(-50%);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 16px;
  font-size: .84rem;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--ink);
  background: linear-gradient(180deg, rgba(51, 230, 255, .13), rgba(139, 92, 255, .12));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color .2s var(--ease), transform .2s var(--ease), color .2s var(--ease);
}
.nav-cta::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--orange);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
}
.nav-cta:hover { border-color: var(--cyan); transform: translateY(-1px); }

/* ---------- footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 110px);
  background: var(--bg);
  border-top: 1px solid var(--line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 52%, transparent);
}
.site-footer__top {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(36px, 5vw, 72px) clamp(16px, 3vw, 32px) clamp(28px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(240px, 1.5fr) repeat(2, minmax(130px, .8fr)) minmax(200px, 1fr);
  gap: clamp(24px, 4vw, 48px);
}
.footer-brand { display: flex; flex-direction: column; gap: 14px; }
.brand--footer { padding: 0; }
.brand--footer .brand__mark { width: 30px; height: 30px; }
.footer-summary {
  max-width: 34ch;
  font-size: .92rem;
  color: var(--muted);
}
.footer-legend { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.footer-legend__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--muted);
}
.footer-legend__key {
  font-family: var(--font-mono);
  font-size: .72rem;
  padding: 2px 6px;
  color: var(--cyan);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.footer-col { display: flex; flex-direction: column; gap: 14px; }
.footer-col__title {
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .18em;
  color: var(--violet);
}
.footer-list { display: grid; gap: 10px; }
.footer-list a {
  display: inline-block;
  font-size: .92rem;
  color: var(--muted);
  transition: color .2s var(--ease), transform .2s var(--ease);
}
.footer-list a:hover { color: var(--cyan); transform: translateX(3px); }
.footer-contact { display: grid; gap: 10px; }
.footer-contact__row { display: flex; gap: 10px; align-items: flex-start; font-size: .88rem; }
.footer-contact__k {
  flex: 0 0 42px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--cyan);
  padding-top: 3px;
}
.footer-contact__v { color: var(--muted); word-break: break-word; }
.site-footer__bottom {
  border-top: 1px solid var(--line);
  background: rgba(20, 27, 58, .6);
}
.site-footer__bottom-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px clamp(16px, 3vw, 32px);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: center;
  justify-content: space-between;
  font-size: .78rem;
  letter-spacing: .05em;
  color: var(--muted);
}
.footer-legal { display: flex; align-items: center; gap: 10px; }
.footer-icp { font-family: var(--font-mono); color: var(--muted); }
.footer-meta { color: var(--muted); }

/* ---------- panels / cards ---------- */
.panel {
  position: relative;
  padding: var(--pad);
  background: linear-gradient(180deg, rgba(30, 41, 84, .88), rgba(20, 27, 58, .94));
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.panel::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 16px;
  height: 16px;
  border-top: 2px solid var(--cyan);
  border-left: 2px solid var(--cyan);
}
.panel::after {
  content: "";
  position: absolute;
  right: -1px;
  bottom: -1px;
  width: 16px;
  height: 16px;
  border-right: 2px solid var(--violet);
  border-bottom: 2px solid var(--violet);
}
.panel--flat { background: rgba(20, 27, 58, .62); }
.panel--accent { border-color: rgba(51, 230, 255, .38); }
.panel__head {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.panel__title { font-size: 1.1rem; font-weight: 800; letter-spacing: .03em; }
.panel__body { color: var(--muted); font-size: .96rem; }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(16px, 2.2vw, 26px);
  background: linear-gradient(180deg, rgba(30, 41, 84, .72), rgba(20, 27, 58, .9));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(51, 230, 255, .5);
  box-shadow: 0 20px 42px -28px rgba(51, 230, 255, .6);
}
.card__title { font-size: 1.03rem; font-weight: 800; letter-spacing: .03em; }
.card__text { font-size: .92rem; color: var(--muted); }
.card__meta {
  margin-top: auto;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--violet);
}

/* ---------- section head ---------- */
.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(12px, 2vw, 26px);
  align-items: start;
  margin-bottom: clamp(20px, 3vw, 36px);
}
.section-head__index {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .26em;
  color: var(--cyan);
  padding: 6px 2px;
  border-left: 1px solid var(--line);
}
.section-head__title { font-size: clamp(1.5rem, 3.2vw, 2.35rem); font-weight: 900; }
.section-head__note {
  margin-top: 10px;
  max-width: 66ch;
  font-size: .95rem;
  color: var(--muted);
}

/* ---------- buttons / badges / tags ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  font-size: .95rem;
  font-weight: 700;
  letter-spacing: .04em;
  color: var(--ink);
  background: rgba(30, 41, 84, .6);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform .2s var(--ease), border-color .2s var(--ease), box-shadow .2s var(--ease), background-color .2s var(--ease);
}
.btn:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
  box-shadow: 0 16px 34px -24px rgba(51, 230, 255, .8);
}
.btn--primary {
  color: #060B1C;
  background: linear-gradient(120deg, var(--cyan), #6FE3FF 42%, var(--violet));
  border-color: transparent;
}
.btn--primary:hover { box-shadow: 0 18px 38px -18px rgba(51, 230, 255, .65); }
.btn--accent {
  color: #241000;
  background: linear-gradient(120deg, var(--orange), #FFC46B);
  border-color: transparent;
}
.btn--accent:hover { box-shadow: 0 18px 38px -18px rgba(255, 159, 67, .7); }
.btn--quiet {
  padding: 8px 2px;
  color: var(--cyan);
  background: transparent;
  border-color: transparent;
}
.btn--quiet:hover { transform: none; box-shadow: none; color: var(--ink); }
.btn--block { width: 100%; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: .45; cursor: not-allowed; transform: none; box-shadow: none; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px;
  font-size: .74rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--muted);
  background: rgba(20, 27, 58, .85);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  white-space: nowrap;
}
.badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}
.badge--ok { color: var(--ok); border-color: rgba(61, 220, 151, .42); }
.badge--ok::before { background: var(--ok); }
.badge--warn { color: var(--warn); border-color: rgba(255, 107, 107, .42); }
.badge--warn::before { background: var(--warn); }
.badge--hot { color: var(--orange); border-color: rgba(255, 159, 67, .48); }
.badge--hot::before { background: var(--orange); }

.tag {
  display: inline-block;
  padding: 3px 9px;
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.tag--cyan { color: var(--cyan); border-color: rgba(51, 230, 255, .42); }
.tag--violet { color: var(--violet); border-color: rgba(139, 92, 255, .48); }

/* ---------- breadcrumb ---------- */
.breadcrumb { padding: 14px 0 0; }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: .78rem;
  letter-spacing: .07em;
  color: var(--muted);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb__item + .breadcrumb__item::before { content: "/"; color: var(--line); }
.breadcrumb__item a:hover { color: var(--cyan); }
.breadcrumb__item [aria-current="page"] { color: var(--ink); }

/* ---------- prose ---------- */
.prose {
  max-width: 70ch;
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--muted);
}
.prose h2, .prose h3 { margin: 28px 0 12px; color: var(--ink); }
.prose p + p { margin-top: 14px; }
.prose ul, .prose ol { display: grid; gap: 9px; margin: 16px 0; }
.prose li { position: relative; padding-left: 20px; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 7px;
  height: 7px;
  background: var(--cyan);
  opacity: .85;
}
.prose strong { color: var(--ink); font-weight: 800; }
.prose a { color: var(--cyan); border-bottom: 1px solid rgba(51, 230, 255, .4); }

/* ---------- figure (image containers) ---------- */
.figure {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(51, 230, 255, .13), rgba(139, 92, 255, .18) 55%, rgba(11, 16, 38, .92));
}
.figure::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .55;
  background-image:
    linear-gradient(rgba(46, 61, 115, .7) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 61, 115, .7) 1px, transparent 1px);
  background-size: 46px 46px;
}
.figure > img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure--wide { aspect-ratio: 21 / 9; }
.figure--tall { aspect-ratio: 4 / 5; }
.figure--square { aspect-ratio: 1 / 1; }
.figure__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 8px 14px;
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--muted);
  background: rgba(11, 16, 38, .82);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
}
.figure__badge { position: absolute; top: 12px; left: 12px; z-index: 2; }

/* ---------- tabs ---------- */
.tabs { display: grid; gap: 18px; }
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}
.tabs__btn {
  padding: 9px 16px;
  font-size: .88rem;
  letter-spacing: .05em;
  color: var(--muted);
  background: rgba(20, 27, 58, .72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}
.tabs__btn:hover { color: var(--ink); border-color: var(--cyan); }
.tabs__btn[aria-selected="true"] {
  color: #060B1C;
  font-weight: 700;
  background: linear-gradient(120deg, var(--cyan), var(--violet));
  border-color: transparent;
}
.tabs__panel { padding-top: 4px; color: var(--muted); font-size: .96rem; }
.tabs__panel[hidden] { display: none; }

/* ---------- toc ---------- */
.toc {
  position: sticky;
  top: calc(var(--header-h) + 18px);
  padding-left: 16px;
  border-left: 1px solid var(--line);
}
.toc__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .22em;
  color: var(--violet);
}
.toc__list { display: grid; gap: 2px; }
.toc__link {
  position: relative;
  display: block;
  padding: 8px 0 8px 16px;
  font-size: .9rem;
  color: var(--muted);
  transition: color .2s var(--ease);
}
.toc__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 7px;
  height: 1px;
  background: var(--line);
  transform: translateY(-50%);
  transition: width .2s var(--ease), background-color .2s var(--ease);
}
.toc__link:hover { color: var(--ink); }
.toc__link[data-current="true"] { color: var(--cyan); }
.toc__link[data-current="true"]::before { width: 16px; background: var(--cyan); }

/* ---------- ledger table ---------- */
.table-wrap {
  overflow-x: auto;
  background: rgba(20, 27, 58, .62);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.ledger { width: 100%; min-width: 520px; font-size: .9rem; }
.ledger th, .ledger td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}
.ledger th {
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .14em;
  color: var(--muted);
  background: rgba(30, 41, 84, .78);
}
.ledger td { color: var(--muted); }
.ledger tbody tr:hover td { color: var(--ink); background: rgba(51, 230, 255, .06); }
.ledger tbody tr:last-child td { border-bottom: 0; }

/* ---------- copy line ---------- */
.copyline { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.copyline__value {
  font-family: var(--font-mono);
  letter-spacing: .04em;
  color: var(--ink);
  word-break: break-all;
}
.copy-btn {
  padding: 7px 12px;
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--muted);
  background: rgba(30, 41, 84, .72);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}
.copy-btn:hover { color: var(--cyan); border-color: var(--cyan); }
.copy-btn[data-copied="true"] { color: var(--ok); border-color: rgba(61, 220, 151, .6); }
.copy-btn[data-copied="false"] { color: var(--warn); border-color: rgba(255, 107, 107, .6); }

/* ---------- to top ---------- */
.to-top {
  position: fixed;
  right: clamp(14px, 2.4vw, 28px);
  bottom: clamp(14px, 2.4vw, 28px);
  z-index: 110;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px;
  font-size: .76rem;
  letter-spacing: .12em;
  color: var(--muted);
  background: rgba(20, 27, 58, .94);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.to-top[data-visible="true"] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { color: var(--cyan); border-color: var(--cyan); }

/* ---------- reveal ---------- */
html[data-js="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .42s var(--ease), transform .42s var(--ease);
}
html[data-js="on"] [data-reveal][data-revealed="true"] { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .site-footer__top { grid-template-columns: minmax(220px, 1.3fr) repeat(2, minmax(130px, 1fr)); }
  .footer-col--contact { grid-column: 1 / -1; }
}
@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    position: fixed;
    top: var(--header-h);
    left: 0;
    right: 0;
    bottom: 0;
    margin: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 18px clamp(16px, 4vw, 32px) 48px;
    background: rgba(11, 16, 38, .985);
    border-top: 1px solid var(--line);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s var(--ease);
  }
  .site-nav[data-open="true"] { opacity: 1; visibility: visible; transform: none; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__item + .site-nav__item { border-top: 1px solid var(--line); }
  .site-nav__link { padding: 16px 4px; font-size: 1.05rem; color: var(--ink); }
  .site-nav__link::after { left: 4px; right: auto; width: 28px; bottom: 12px; }
  .site-nav__link[aria-current="page"]::before { left: auto; right: 2px; }
  .nav-cta { margin-top: 22px; justify-content: center; padding: 14px 18px; font-size: .95rem; }
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--sidebar { grid-template-columns: minmax(0, 1fr); }
  .toc {
    position: static;
    padding: 14px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }
}
@media (max-width: 720px) {
  .brand__tagline { display: none; }
  .site-footer__top { grid-template-columns: minmax(0, 1fr); }
  .footer-col--contact { grid-column: auto; }
  .section-head { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .section-head__index { writing-mode: horizontal-tb; transform: none; border-left: 0; padding: 0; }
}
@media (max-width: 620px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
  .site-footer__bottom-inner { flex-direction: column; align-items: flex-start; }
}

/* ---------- motion preference ---------- */
@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[data-js="on"] [data-reveal] { opacity: 1; transform: none; }
  .site-nav, .site-nav[data-open="true"] { transform: none; }
}