/* ============================================================
   CMD赛场 · shared site kit
   夜间球场指挥中心 / 展览画册网格 / 印刷标签系统
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: #061826;
}

body,
h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; }
:where(ul, ol)[class] { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; border-top: 1px solid #12344a; }
:where(section, article, div)[id] { scroll-margin-top: 6.5rem; }

/* ---------- 2. tokens ---------- */
:root {
  --ink-900: #061826;
  --ink-850: #081d2f;
  --ink-800: #0b2238;
  --ink-700: #12344a;
  --cyan: #35f2d0;
  --cyan-soft: #7bf8e2;
  --orange: #ff6a2a;
  --grass: #49c46a;
  --amber: #ffc857;
  --ice: #eaf6ff;
  --mist: #8ba3b8;
  --alert: #ff4d6d;

  --line: rgba(139, 163, 184, 0.26);
  --line-strong: rgba(53, 242, 208, 0.45);
  --on-accent: #04141f;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, "Roboto Mono", monospace;

  --fs-display: clamp(3rem, 8.5vw, 7rem);
  --fs-numeric: clamp(4.5rem, 16vw, 12.5rem);
  --fs-h1: clamp(1.9rem, 4.4vw, 3.2rem);
  --fs-h2: clamp(1.45rem, 2.6vw, 2.15rem);
  --fs-h3: clamp(1.1rem, 1.6vw, 1.35rem);
  --fs-body: clamp(1rem, 1.05vw, 1.125rem);
  --fs-annot: 0.8125rem;
  --fs-tag: 0.75rem;

  --wrap: 76rem;
  --wrap-wide: 88rem;
  --gutter: clamp(1.15rem, 4vw, 3.5rem);
  --console-h: 2.5rem;
  --bar-h: 4.5rem;
  --radius: 2px;
}

/* ---------- 3. base ---------- */
body {
  background-color: var(--ink-900);
  background-image:
    linear-gradient(90deg, rgba(18, 52, 74, 0.55) 1px, transparent 1px),
    linear-gradient(180deg, rgba(18, 52, 74, 0.32) 1px, transparent 1px);
  background-size: 88px 88px;
  color: var(--ice);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

.site-main { display: block; }
.site-main:focus { outline: none; }

/* ---------- 4. skip link ---------- */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 300;
  padding: 0.6rem 1.1rem;
  background: var(--cyan);
  color: var(--on-accent);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
  transform: translateY(-240%);
  transition: transform 0.18s ease;
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- 5. header ---------- */
.site-header {
  position: sticky;
  top: calc(-1 * var(--console-h));
  z-index: 80;
  background: var(--ink-900);
}
.site-header.is-scrolled .header-bar { box-shadow: 0 18px 34px -22px rgba(0, 0, 0, 0.9); }

/* 5.1 上层：信号带 */
.header-console {
  height: var(--console-h);
  background: var(--ink-800);
  border-bottom: 1px solid var(--ink-700);
  display: flex;
  align-items: center;
  overflow: hidden;
}
.console-inner {
  width: 100%;
  max-width: var(--wrap-wide);
  margin: 0 auto;
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  gap: 1.5rem;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  white-space: nowrap;
}
.console-signal {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--ice);
  font-weight: 600;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
}
.signal-dot {
  width: 0.5rem;
  height: 0.5rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--grass);
  box-shadow: 0 0 0 3px rgba(73, 196, 106, 0.18);
  animation: signal-pulse 2.6s ease-in-out infinite;
}
@keyframes signal-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}
.console-meta {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
}
.meta-item { color: var(--mist); }
.meta-item--amber { color: var(--amber); }
.meta-item--grass { color: var(--grass); }
.console-link {
  color: var(--cyan);
  font-weight: 600;
  border-bottom: 1px solid transparent;
  padding-bottom: 1px;
}
.console-link:hover { border-bottom-color: currentColor; }

/* 5.2 下层：栏目带 */
.header-bar {
  background: var(--ink-900);
  border-bottom: 1px solid var(--ink-700);
  transition: box-shadow 0.24s ease;
}
.bar-inner {
  max-width: var(--wrap-wide);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: var(--bar-h);
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 2.7rem;
  height: 2.7rem;
  background: var(--cyan);
  color: var(--on-accent);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  border-radius: var(--radius);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 1.125rem; font-weight: 800; letter-spacing: 0.02em; color: var(--ice); }
.brand-sub {
  font-size: 0.6875rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

/* 5.3 导航 */
.primary-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.nav-list { display: flex; align-items: center; gap: 0.15rem; }
.nav-item { flex: 0 0 auto; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.35rem;
  padding: 0.55rem 0.6rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--ice);
  border-radius: var(--radius);
  transition: color 0.16s ease, background-color 0.16s ease;
}
.nav-link:hover { color: var(--cyan); background: var(--ink-800); }
.nav-link::after {
  content: "";
  position: absolute;
  left: 0.6rem;
  right: 0.6rem;
  bottom: 0.18rem;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s ease;
}
.nav-link[aria-current="page"] { color: var(--cyan); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}
.nav-link[aria-current="page"] .nav-index { color: var(--cyan); }
.nav-cta { margin-left: 0.35rem; }

/* 5.4 移动按钮与遮罩 */
.nav-toggle {
  display: none;
  margin-left: auto;
  position: relative;
  z-index: 120;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--ice);
  background: var(--ink-800);
}
.nav-toggle-bars { display: flex; flex-direction: column; gap: 4px; width: 1.05rem; }
.nav-toggle-bars span {
  display: block;
  height: 2px;
  background: var(--cyan);
  transition: transform 0.2s ease;
}
.nav-toggle-label { font-size: 0.75rem; letter-spacing: 0.14em; color: var(--mist); }
.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-scrim { display: none; }

/* 5.5 阅读进度刻度 */
.scroll-meter { height: 2px; background: var(--ink-700); overflow: hidden; }
.scroll-meter-fill {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--grass) 62%, var(--amber) 100%);
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

/* ---------- 6. footer ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(2.5rem, 7vw, 5.5rem);
  background: var(--ink-850);
  border-top: 1px solid var(--ink-700);
  overflow: hidden;
}
.footer-shell {
  position: relative;
  z-index: 1;
  max-width: var(--wrap-wide);
  margin: 0 auto;
  padding: clamp(2.25rem, 5.5vw, 4rem) var(--gutter) 1.75rem;
}
.footer-mast {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding-bottom: 1.75rem;
  border-bottom: 1px solid var(--line);
}
.footer-round {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  line-height: 0.85;
  letter-spacing: -0.05em;
  color: var(--amber);
}
.footer-id { display: flex; flex-direction: column; gap: 0.3rem; min-width: 0; }
.footer-brand { font-size: 1.125rem; font-weight: 800; letter-spacing: 0.01em; }
.footer-brand-line {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}
.footer-note { font-size: 0.8125rem; line-height: 1.65; color: var(--mist); max-width: 46ch; }
.footer-cta { justify-self: end; }

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
  padding: 2rem 0;
  border-bottom: 1px solid var(--line);
}
.footer-col { min-width: 0; }
.footer-col-title {
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin-bottom: 0.85rem;
}
.footer-links { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-link {
  font-size: 0.9375rem;
  color: var(--ice);
  opacity: 0.86;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, opacity 0.16s ease;
}
.footer-link:hover { color: var(--cyan); opacity: 1; }

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 0.85rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--line);
}
.contact-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.3rem 0.75rem;
  padding: 0.75rem 0.9rem;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-left: 2px solid var(--grass);
  border-radius: var(--radius);
}
.contact-row--wide { grid-column: 1 / -1; }
.contact-label {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  color: var(--mist);
}
.contact-value {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  color: var(--ice);
  overflow-wrap: anywhere;
}
.contact-row--wide .contact-value {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--mist);
}
.copy-btn {
  padding: 0.32rem 0.7rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  transition: background-color 0.16s ease, color 0.16s ease;
}
.copy-btn:hover { background: var(--cyan); color: var(--on-accent); }
.copy-status {
  grid-column: 1 / -1;
  min-height: 1em;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--grass);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem 1.5rem;
  padding-top: 1.4rem;
  font-size: 0.8125rem;
  color: var(--mist);
}
.legal-links { display: flex; flex-wrap: wrap; gap: 1.15rem; }
.legal-link { color: var(--ice); border-bottom: 1px solid var(--line); }
.legal-link:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.footer-icp {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
}
.footer-copy { font-size: 0.6875rem; font-family: var(--font-mono); letter-spacing: 0.08em; }

/* ---------- 7. layout primitives ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.container--wide { max-width: var(--wrap-wide); }

.section { padding: clamp(2.25rem, 6vw, 4.75rem) 0; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  padding-bottom: 1rem;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
}
.section-title {
  font-size: var(--fs-h2);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 1.6rem; height: 2px; background: var(--cyan); }
.lead {
  font-size: clamp(1.02rem, 1.4vw, 1.22rem);
  line-height: 1.72;
  color: var(--ice);
  opacity: 0.9;
  max-width: 54ch;
}
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
}
.annot {
  font-size: var(--fs-annot);
  letter-spacing: 0.16em;
  color: var(--mist);
  text-transform: uppercase;
}
.vertical-note {
  writing-mode: vertical-rl;
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  color: var(--mist);
  text-transform: uppercase;
}

.grid { display: grid; gap: clamp(1rem, 2.2vw, 1.75rem); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 11.5rem), 1fr)); }

/* ---------- 8. buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.15rem;
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--ice);
  background: var(--ink-800);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  white-space: nowrap;
  transition: background-color 0.16s ease, border-color 0.16s ease, color 0.16s ease, transform 0.16s ease;
}
.btn:hover { background: var(--ink-700); border-color: var(--cyan); color: var(--cyan); }
.btn:active { transform: translateY(1px); }
.btn--accent { background: var(--cyan); border-color: var(--cyan); color: var(--on-accent); }
.btn--accent:hover { background: var(--cyan-soft); border-color: var(--cyan-soft); color: var(--on-accent); }
.btn--ghost { background: transparent; border-color: var(--line); }
.btn--sm { padding: 0.45rem 0.8rem; font-size: 0.8125rem; }

/* ---------- 9. tags ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.16rem 0.5rem;
  font-size: var(--fs-tag);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.65;
  border: 1px solid currentColor;
  border-radius: var(--radius);
}
.tag--data { color: var(--cyan); background: rgba(53, 242, 208, 0.08); }
.tag--fixture { color: var(--grass); background: rgba(73, 196, 106, 0.08); }
.tag--video { color: var(--amber); background: rgba(255, 200, 87, 0.08); }
.tag--member { color: var(--orange); background: rgba(255, 106, 42, 0.08); }
.tag--help { color: var(--ice); border-color: var(--line); background: var(--ink-800); }

/* ---------- 10. cards & stats ---------- */
.card {
  position: relative;
  padding: clamp(1.05rem, 2vw, 1.5rem);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.card--raised { box-shadow: 0 20px 0 -10px var(--ink-700), 0 0 0 1px var(--line); }
.card-title { font-size: var(--fs-h3); font-weight: 700; line-height: 1.4; }
.card-meta { font-size: 0.8125rem; color: var(--mist); }

.stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.85rem 1rem;
  background: var(--ink-800);
  border-left: 2px solid var(--cyan);
}
.stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
}
.stat-label {
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--mist);
  text-transform: uppercase;
}

/* ---------- 11. image frames ---------- */
.img-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.img-frame img { width: 100%; height: 100%; object-fit: cover; }
.img-frame--wide { aspect-ratio: 21 / 9; }
.img-frame--tall { aspect-ratio: 3 / 4; }
.img-frame--square { aspect-ratio: 1 / 1; }
.img-frame--tactical::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(90deg, rgba(53, 242, 208, 0.16) 1px, transparent 1px),
    linear-gradient(180deg, rgba(53, 242, 208, 0.16) 1px, transparent 1px);
  background-size: 2.5rem 2.5rem;
  mix-blend-mode: screen;
}

/* ---------- 12. horizontal rail ---------- */
.rail { position: relative; }
.rail-track {
  display: flex;
  gap: clamp(0.75rem, 1.6vw, 1.15rem);
  overflow-x: auto;
  padding-bottom: 0.85rem;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-700) transparent;
  cursor: grab;
}
.rail-track:focus-visible { outline: 2px solid var(--cyan); outline-offset: 4px; }
.rail-track.is-dragging { cursor: grabbing; scroll-snap-type: none; }
.rail-track::-webkit-scrollbar { height: 6px; }
.rail-track::-webkit-scrollbar-track { background: transparent; }
.rail-track::-webkit-scrollbar-thumb { background: var(--ink-700); border-radius: 3px; }
.rail-item { flex: 0 0 clamp(14.5rem, 26vw, 20rem); scroll-snap-align: start; }

/* ---------- 13. chapter nav ---------- */
.chapter-nav { position: sticky; top: calc(var(--bar-h) + 1rem); }
.chapter-title {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--mist);
  margin-bottom: 0.7rem;
}
.chapter-list { display: flex; flex-direction: column; gap: 0.1rem; }
.chapter-link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.5rem 0.6rem;
  font-size: 0.875rem;
  color: var(--mist);
  border-left: 2px solid transparent;
  transition: color 0.16s ease, background-color 0.16s ease, border-color 0.16s ease;
}
.chapter-link:hover { color: var(--ice); background: var(--ink-800); }
.chapter-link.is-active {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--ink-800);
}
.chapter-link .num { font-size: 0.6875rem; opacity: 0.7; }

/* ---------- 14. accordion ---------- */
.accordion { display: flex; flex-direction: column; gap: 0.5rem; }
.accordion-item { background: var(--ink-800); border: 1px solid var(--line); border-radius: var(--radius); }
.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: 100%;
  padding: 1rem 1.1rem;
  text-align: left;
  font-weight: 700;
  color: var(--ice);
  transition: color 0.16s ease;
}
.accordion-trigger:hover { color: var(--cyan); }
.accordion-trigger::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--cyan);
}
.accordion-trigger[aria-expanded="true"]::after { content: "–"; }
.accordion-panel { padding: 0 1.1rem 1.1rem; font-size: 0.9375rem; color: var(--mist); }
.accordion-panel[hidden] { display: none; }

/* ---------- 15. breadcrumb ---------- */
.breadcrumb { padding: 0.9rem 0; border-bottom: 1px solid var(--line); }
.crumb-list { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem; font-size: 0.8125rem; color: var(--mist); }
.crumb-item { display: inline-flex; align-items: center; gap: 0.5rem; }
.crumb-item:not(:last-child)::after { content: "/"; color: var(--ink-700); }
.crumb-list a { color: var(--mist); }
.crumb-list a:hover { color: var(--cyan); }
.crumb-current { color: var(--ice); font-weight: 600; }

/* ---------- 16. back to top ---------- */
.back-top {
  position: fixed;
  right: clamp(0.9rem, 3vw, 2rem);
  bottom: clamp(0.9rem, 3vw, 2rem);
  z-index: 70;
  display: grid;
  place-items: center;
  gap: 0.1rem;
  width: 3.1rem;
  height: 3.1rem;
  background: var(--ink-800);
  color: var(--cyan);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.1em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(0.75rem);
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease, background-color 0.16s ease, color 0.16s ease;
}
.back-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--cyan); color: var(--on-accent); }
.back-top-icon { font-size: 0.9rem; line-height: 1; }

/* ---------- 17. reveal ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.has-js [data-reveal].is-revealed { opacity: 1; transform: none; }

/* ---------- 18. responsive ---------- */
@media (max-width: 64rem) {
  .console-meta { display: none; }
  .console-link { margin-left: auto; }

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

  .primary-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(21rem, 86vw);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 5.25rem 1.4rem 2rem;
    background: var(--ink-850);
    border-left: 1px solid var(--line-strong);
    box-shadow: -26px 0 50px rgba(3, 12, 20, 0.6);
    transform: translateX(102%);
    visibility: hidden;
    overflow-y: auto;
    z-index: 110;
    transition: transform 0.3s ease, visibility 0.3s ease;
  }
  .primary-nav[data-open="true"] { transform: translateX(0); visibility: visible; }

  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-link {
    width: 100%;
    padding: 0.9rem 0.25rem;
    font-size: 1.0625rem;
    border-radius: 0;
    border-bottom: 1px solid var(--line);
  }
  .nav-link:hover { background: transparent; }
  .nav-link::after { display: none; }
  .nav-link[aria-current="page"] { border-bottom-color: var(--cyan); background: rgba(53, 242, 208, 0.06); }
  .nav-cta { margin: 1.35rem 0 0; padding: 0.85rem 1rem; }

  .nav-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(6, 24, 38, 0.74);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.26s ease;
  }
  .primary-nav[data-open="true"] + .nav-scrim { opacity: 1; pointer-events: auto; }

  body.nav-open { overflow: hidden; }
}

@media (max-width: 48rem) {
  :root { --console-h: 2.25rem; --bar-h: 3.75rem; }

  .console-inner { gap: 0.75rem; font-size: 0.6875rem; letter-spacing: 0.04em; }
  .brand-sub { display: none; }
  .brand-mark { width: 2.35rem; height: 2.35rem; font-size: 0.75rem; }
  .brand-name { font-size: 1rem; }

  .footer-mast { grid-template-columns: 1fr; align-items: start; gap: 0.9rem; }
  .footer-round { font-size: 3rem; }
  .footer-cta { justify-self: start; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.6rem 1.1rem; }
  .footer-legal { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .footer-icp { margin-left: 0; }
  .back-top { width: 2.75rem; height: 2.75rem; }
}

@media (max-width: 26rem) {
  .footer-grid { grid-template-columns: 1fr; }
  .nav-toggle-label { display: none; }
}

/* ---------- 19. motion preferences ---------- */
@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;
  }
  .has-js [data-reveal] { opacity: 1; transform: none; }
  .signal-dot { animation: none; }
}