/* ==========================================================================
   6163银河主页 · 共享站点样式 /assets/site.css
   深空蓝黑底 · 银河紫与星云粉主光 · 青蓝与暖金点色 · 奶油纸阅读面板
   ========================================================================== */

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

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

body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
:where(h1, h2, h3, h4) { line-height: 1.2; }

/* ---------- tokens ---------- */
:root {
  --gx-void: #05070F;
  --gx-deep: #0B1026;
  --gx-violet: #6C4AB6;
  --gx-pink: #E86FA8;
  --gx-cyan: #4FD1E0;
  --gx-gold: #F2B75E;
  --gx-paper: #F4EDE1;
  --gx-ink: #221A14;
  --gx-star: #F2F4FF;
  --gx-mute: #9A8FC0;

  --gx-line: rgba(154, 143, 192, 0.26);
  --gx-line-strong: rgba(154, 143, 192, 0.5);
  --gx-glow: 0 0 26px rgba(108, 74, 182, 0.55);
  --gx-shadow: 0 22px 48px -30px rgba(108, 74, 182, 0.95);

  --gx-font-sans: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, sans-serif;
  --gx-font-mono: "IBM Plex Mono", "SFMono-Regular", Menlo, Consolas,
    "Noto Sans Mono", monospace;

  --gx-wrap: 1220px;
  --gx-radius: 2px;
  --gx-header-h: 66px;
}

/* ---------- base ---------- */
html { background-color: var(--gx-void); }

body {
  min-height: 100%;
  font-family: var(--gx-font-sans);
  font-size: 16px;
  line-height: 1.8;
  color: var(--gx-star);
  background-color: var(--gx-void);
  background-image:
    radial-gradient(1100px 620px at 10% -12%, rgba(108, 74, 182, 0.34), transparent 70%),
    radial-gradient(880px 520px at 94% 2%, rgba(232, 111, 168, 0.2), transparent 72%),
    radial-gradient(1px 1px at 22% 38%, rgba(242, 244, 255, 0.5), transparent 60%),
    radial-gradient(1px 1px at 68% 18%, rgba(242, 244, 255, 0.35), transparent 60%),
    radial-gradient(1px 1px at 84% 62%, rgba(242, 244, 255, 0.4), transparent 60%);
  background-repeat: no-repeat;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

p { line-height: 1.85; }

::selection { background: rgba(232, 111, 168, 0.35); color: var(--gx-star); }

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

/* ---------- skip link ---------- */
.gx-skip {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 140;
  transform: translateY(-140%);
  padding: 0.7rem 1.15rem;
  background: var(--gx-paper);
  color: var(--gx-ink);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  border: 1px solid var(--gx-ink);
  transition: transform 0.22s ease;
}
.gx-skip:focus { transform: translateY(0); }

/* ---------- layout ---------- */
.gx-container {
  width: 100%;
  max-width: var(--gx-wrap);
  margin-inline: auto;
  padding-inline: clamp(1.1rem, 4vw, 2.75rem);
}

.gx-section {
  position: relative;
  padding-block: clamp(3.6rem, 9vw, 7.5rem);
}
.gx-section--tight { padding-block: clamp(2.2rem, 5vw, 4rem); }

.gx-section--paper {
  background: var(--gx-paper);
  color: var(--gx-ink);
}
.gx-section--paper .gx-lede { color: rgba(34, 26, 20, 0.78); }
.gx-section--paper .gx-eyebrow { color: var(--gx-violet); }
.gx-section--paper .gx-rule { background: rgba(34, 26, 20, 0.2); }
.gx-section--paper .gx-panel { border-color: rgba(34, 26, 20, 0.18); background: rgba(255, 255, 255, 0.5); }

/* ---------- typography ---------- */
.gx-display {
  font-size: clamp(2.6rem, 7vw, 6rem);
  font-weight: 700;
  letter-spacing: 0.09em;
  line-height: 1.05;
  text-shadow: 0 0 34px rgba(108, 74, 182, 0.55);
}

.gx-title {
  font-size: clamp(1.8rem, 4vw, 3.2rem);
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.16;
  text-shadow: 0 0 26px rgba(108, 74, 182, 0.35);
}

.gx-heading {
  font-size: clamp(1.12rem, 2vw, 1.45rem);
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.35;
}

.gx-lede {
  max-width: 62ch;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 1.85;
  color: rgba(242, 244, 255, 0.76);
}

.gx-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--gx-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--gx-cyan);
}
.gx-eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: linear-gradient(90deg, var(--gx-cyan), rgba(79, 209, 224, 0));
}

.gx-annotation {
  font-family: var(--gx-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: rgba(154, 143, 192, 0.85);
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.gx-rule {
  position: relative;
  height: 1px;
  width: 100%;
  background: var(--gx-line);
  border: 0;
}
.gx-rule::after {
  content: "";
  position: absolute;
  top: -2px;
  left: 0;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--gx-cyan);
  box-shadow: 0 0 10px rgba(79, 209, 224, 0.85);
}

/* ---------- panels / cards ---------- */
.gx-panel {
  position: relative;
  padding: clamp(1.3rem, 3vw, 2.2rem);
  background: rgba(11, 16, 38, 0.72);
  border: 1px solid var(--gx-line);
  border-radius: var(--gx-radius);
}

.gx-panel--paper {
  background: var(--gx-paper);
  color: var(--gx-ink);
  border-color: rgba(34, 26, 20, 0.2);
}

.gx-card {
  position: relative;
  padding: clamp(1.3rem, 3vw, 2rem);
  background: linear-gradient(180deg, rgba(11, 16, 38, 0.88), rgba(5, 7, 15, 0.88));
  border: 1px solid var(--gx-line);
  border-radius: var(--gx-radius);
  transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}
.gx-card::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 16px;
  height: 16px;
  border-top: 1px solid var(--gx-cyan);
  border-left: 1px solid var(--gx-cyan);
  opacity: 0.6;
  transition: opacity 0.35s ease, width 0.35s ease, height 0.35s ease;
}
.gx-card:hover,
.gx-card:focus-within {
  transform: translateY(-4px);
  border-color: rgba(232, 111, 168, 0.55);
  box-shadow: var(--gx-shadow);
}
.gx-card:hover::before,
.gx-card:focus-within::before { opacity: 1; width: 26px; height: 26px; }

/* ---------- grid ---------- */
.gx-grid {
  display: grid;
  gap: clamp(1rem, 2.6vw, 2rem);
  grid-template-columns: repeat(var(--gx-cols, 1), minmax(0, 1fr));
}
.gx-grid--2 { --gx-cols: 2; }
.gx-grid--3 { --gx-cols: 3; }

/* ---------- media ---------- */
.gx-media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(135deg, rgba(11, 16, 38, 0.95), rgba(5, 7, 15, 0.95));
  border: 1px solid var(--gx-line);
  border-radius: var(--gx-radius);
}
.gx-media img,
.gx-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.gx-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(60% 60% at 78% 12%, rgba(108, 74, 182, 0.35), transparent 70%),
    linear-gradient(180deg, rgba(5, 7, 15, 0) 55%, rgba(5, 7, 15, 0.6));
}
.gx-media--wide { aspect-ratio: 21 / 9; }
.gx-media--square { aspect-ratio: 1 / 1; }
.gx-media--tall { aspect-ratio: 3 / 4; }

.gx-media__cap {
  display: block;
  margin-top: 0.65rem;
  font-family: var(--gx-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(154, 143, 192, 0.85);
}

/* ---------- orbit decoration ---------- */
.gx-orbit {
  position: absolute;
  z-index: 0;
  border-radius: 50%;
  border: 1px solid rgba(154, 143, 192, 0.2);
  pointer-events: none;
}
.gx-orbit--ring {
  width: min(78vw, 760px);
  aspect-ratio: 1 / 1;
  top: -22%;
  right: -16%;
  border-color: rgba(108, 74, 182, 0.45);
  box-shadow: inset 0 0 140px rgba(108, 74, 182, 0.22);
  animation: gx-spin 68s linear infinite;
}
.gx-orbit--ring::after {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: 50%;
  border: 1px solid transparent;
  border-top-color: var(--gx-pink);
  border-right-color: rgba(79, 209, 224, 0.6);
  filter: drop-shadow(0 0 8px rgba(232, 111, 168, 0.6));
}
.gx-orbit--arc {
  width: min(130vw, 1500px);
  aspect-ratio: 1 / 1;
  bottom: -78%;
  left: -34%;
  border-color: rgba(79, 209, 224, 0.18);
  border-left-color: transparent;
  border-bottom-color: transparent;
}

@keyframes gx-spin { to { transform: rotate(360deg); } }

/* ---------- breadcrumb ---------- */
.gx-breadcrumb { padding-block: 1.1rem; }
.gx-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--gx-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: rgba(154, 143, 192, 0.9);
}
.gx-breadcrumb__item { display: inline-flex; align-items: center; gap: 0.5rem; }
.gx-breadcrumb__item + .gx-breadcrumb__item::before {
  content: "／";
  color: rgba(79, 209, 224, 0.7);
}
.gx-breadcrumb__link { transition: color 0.25s ease; }
.gx-breadcrumb__link:hover { color: var(--gx-cyan); }
.gx-breadcrumb__item[aria-current="page"] .gx-breadcrumb__link { color: var(--gx-star); }

/* ---------- toc ---------- */
.gx-toc { position: sticky; top: calc(var(--gx-header-h) + 1.5rem); }
.gx-toc__list { display: grid; gap: 0.55rem; border-left: 1px solid var(--gx-line); padding-left: 1rem; }
.gx-toc__link {
  display: block;
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  color: rgba(154, 143, 192, 0.92);
  transition: color 0.25s ease, transform 0.25s ease;
}
.gx-toc__link:hover { color: var(--gx-star); transform: translateX(3px); }
.gx-toc__link.is-active {
  color: var(--gx-star);
  border-left: 2px solid var(--gx-pink);
  margin-left: -1.1rem;
  padding-left: 0.95rem;
}

/* ---------- tags ---------- */
.gx-tag-group { display: flex; flex-wrap: wrap; gap: 0.55rem; }
.gx-tag {
  padding: 0.42rem 0.9rem;
  font-family: var(--gx-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: rgba(242, 244, 255, 0.72);
  border: 1px solid var(--gx-line);
  border-radius: var(--gx-radius);
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
.gx-tag:hover { color: var(--gx-star); border-color: var(--gx-cyan); }
.gx-tag[aria-pressed="true"] {
  color: var(--gx-void);
  background: linear-gradient(120deg, var(--gx-cyan), var(--gx-pink));
  border-color: transparent;
}

/* ---------- buttons ---------- */
.gx-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.62rem 1.15rem;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  line-height: 1.3;
  white-space: nowrap;
  border: 1px solid var(--gx-line-strong);
  border-radius: var(--gx-radius);
  color: var(--gx-star);
  background: rgba(11, 16, 38, 0.35);
  transition: color 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease,
    transform 0.28s ease, background 0.28s ease;
}
.gx-btn:hover {
  color: var(--gx-star);
  border-color: rgba(79, 209, 224, 0.8);
  box-shadow: 0 0 20px rgba(79, 209, 224, 0.25);
  transform: translateY(-1px);
}
.gx-btn--primary {
  color: var(--gx-star);
  border-color: rgba(242, 244, 255, 0.2);
  background: linear-gradient(120deg, rgba(108, 74, 182, 0.95), rgba(232, 111, 168, 0.88));
  box-shadow: 0 0 22px rgba(108, 74, 182, 0.45);
  animation: gx-breathe 5.5s ease-in-out infinite;
}
.gx-btn--primary:hover {
  border-color: rgba(242, 244, 255, 0.45);
  box-shadow: 0 0 30px rgba(232, 111, 168, 0.5);
}
.gx-btn--ghost { background: rgba(5, 7, 15, 0.25); }

@keyframes gx-breathe {
  0%, 100% { box-shadow: 0 0 20px rgba(108, 74, 182, 0.4); }
  50% { box-shadow: 0 0 30px rgba(232, 111, 168, 0.5); }
}

/* ---------- progress ---------- */
.gx-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 80;
  background: rgba(154, 143, 192, 0.14);
  pointer-events: none;
}
.gx-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--gx-violet), var(--gx-pink), var(--gx-gold));
  transition: width 0.12s linear;
}

/* ---------- header ---------- */
.gx-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(5, 7, 15, 0.78), rgba(5, 7, 15, 0));
  border-bottom: 1px solid transparent;
  transition: background 0.4s ease, border-color 0.4s ease, backdrop-filter 0.4s ease;
}
.gx-header.is-solid {
  background: rgba(11, 16, 38, 0.94);
  border-bottom-color: var(--gx-line);
  backdrop-filter: blur(14px) saturate(130%);
}

.gx-header__rail {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--gx-wrap);
  margin-inline: auto;
  padding: 0.5rem clamp(1.1rem, 4vw, 2.75rem);
  border-bottom: 1px dashed rgba(154, 143, 192, 0.22);
  max-height: 40px;
  overflow: hidden;
  transition: max-height 0.35s ease, opacity 0.3s ease, padding 0.35s ease;
}
.gx-header.is-solid .gx-header__rail {
  max-height: 0;
  opacity: 0;
  padding-block: 0;
}
.gx-header__coord {
  font-family: var(--gx-font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(154, 143, 192, 0.85);
  white-space: nowrap;
}
.gx-header__coord--end { color: rgba(79, 209, 224, 0.85); }

.gx-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(0.8rem, 3vw, 2rem);
  max-width: var(--gx-wrap);
  margin-inline: auto;
  padding: 0.7rem clamp(1.1rem, 4vw, 2.75rem);
  min-height: var(--gx-header-h);
}

/* brand */
.gx-brand { display: inline-flex; align-items: center; gap: 0.7rem; flex: none; }
.gx-brand__mark {
  position: relative;
  flex: none;
  width: 26px;
  height: 26px;
  border: 1px solid rgba(242, 244, 255, 0.5);
  border-radius: 50%;
}
.gx-brand__mark::before {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 30%, var(--gx-pink), var(--gx-violet) 62%, #2a1c50 100%);
  box-shadow: 0 0 14px rgba(232, 111, 168, 0.65);
}
.gx-brand__mark::after {
  content: "";
  position: absolute;
  inset: -5px;
  border-radius: 50%;
  border: 1px solid rgba(79, 209, 224, 0.5);
  border-left-color: transparent;
  border-bottom-color: transparent;
  transform: rotate(28deg);
}
.gx-brand__text { display: grid; gap: 0.1rem; }
.gx-brand__name {
  font-size: 0.98rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  line-height: 1.25;
  color: var(--gx-star);
}
.gx-brand__sub {
  font-family: var(--gx-font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: rgba(154, 143, 192, 0.85);
}

/* nav */
.gx-nav { flex: 1 1 auto; display: flex; justify-content: center; }
.gx-nav__list { display: flex; align-items: center; gap: clamp(0.9rem, 2vw, 1.7rem); }
.gx-nav__item { display: block; }
.gx-nav__link {
  position: relative;
  display: inline-block;
  padding: 0.35rem 0;
  font-size: 0.86rem;
  letter-spacing: 0.14em;
  color: rgba(242, 244, 255, 0.72);
  transition: color 0.25s ease;
}
.gx-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--gx-cyan), var(--gx-pink));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.3s ease;
}
.gx-nav__link:hover { color: var(--gx-star); }
.gx-nav__link:hover::after { transform: scaleX(1); }
.gx-nav__link[aria-current="page"] { color: var(--gx-star); }
.gx-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.gx-nav__cta { display: none; }

.gx-header__actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex: none;
}

/* nav toggle */
.gx-nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--gx-line-strong);
  border-radius: var(--gx-radius);
  color: var(--gx-star);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.gx-nav-toggle:hover { border-color: var(--gx-cyan); box-shadow: 0 0 16px rgba(79, 209, 224, 0.22); }
.gx-nav-toggle__bars {
  position: relative;
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
}
.gx-nav-toggle__bars::before,
.gx-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background: currentColor;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.gx-nav-toggle__bars::before { top: -7px; }
.gx-nav-toggle__bars::after { top: 7px; }
.gx-nav-toggle[aria-expanded="true"] .gx-nav-toggle__bars { background: transparent; }
.gx-nav-toggle[aria-expanded="true"] .gx-nav-toggle__bars::before { transform: translateY(7px) rotate(45deg); }
.gx-nav-toggle[aria-expanded="true"] .gx-nav-toggle__bars::after { transform: translateY(-7px) rotate(-45deg); }
.gx-nav-toggle__label {
  font-family: var(--gx-font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
}

/* ---------- footer ---------- */
.gx-footer {
  position: relative;
  overflow: hidden;
  padding-top: clamp(3.2rem, 7vw, 6rem);
  background: linear-gradient(180deg, #05070F 0%, #0B1026 52%, #05070F 100%);
  border-top: 1px solid var(--gx-line);
}
.gx-footer::before {
  content: "";
  position: absolute;
  top: -46%;
  left: -12%;
  right: -12%;
  height: 78%;
  background: radial-gradient(closest-side, rgba(108, 74, 182, 0.34), transparent 72%);
  pointer-events: none;
}
.gx-footer::after {
  content: "";
  position: absolute;
  top: 0;
  right: -18%;
  width: min(70vw, 720px);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 1px solid rgba(79, 209, 224, 0.14);
  border-bottom-color: transparent;
  pointer-events: none;
}

.gx-footer__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.55fr);
  gap: clamp(2rem, 5vw, 4rem);
  padding-bottom: clamp(2.4rem, 5vw, 3.6rem);
}

.gx-footer__identity { display: grid; align-content: start; gap: 1.2rem; }
.gx-brand--footer .gx-brand__name { font-size: 1.08rem; }

.gx-footer__note {
  max-width: 34ch;
  font-size: 0.92rem;
  color: rgba(242, 244, 255, 0.7);
}

.gx-footer__contact { display: grid; gap: 0.55rem; }
.gx-footer__contact-item {
  display: grid;
  grid-template-columns: 5.4rem minmax(0, 1fr);
  gap: 0.6rem;
  align-items: baseline;
  font-size: 0.82rem;
  line-height: 1.7;
}
.gx-footer__key {
  font-family: var(--gx-font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(154, 143, 192, 0.92);
}
.gx-footer__value { color: rgba(242, 244, 255, 0.78); word-break: break-word; }

.gx-footer__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.4rem, 4vw, 2.6rem);
}
.gx-footer__group {
  position: relative;
  padding-top: 1.1rem;
  border-top: 1px solid var(--gx-line);
}
.gx-footer__title {
  margin-bottom: 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--gx-star);
}
.gx-footer__links { display: grid; gap: 0.5rem; }
.gx-footer__link {
  display: inline-block;
  font-size: 0.88rem;
  color: rgba(242, 244, 255, 0.7);
  transition: color 0.25s ease, transform 0.25s ease;
}
.gx-footer__link:hover { color: var(--gx-cyan); transform: translateX(3px); }
.gx-footer__hint {
  margin-top: 0.8rem;
  font-family: var(--gx-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: rgba(154, 143, 192, 0.88);
}

.gx-footer__legal {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem 1.6rem;
  padding-block: 1.3rem 2.2rem;
  border-top: 1px solid var(--gx-line);
  font-family: var(--gx-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: rgba(154, 143, 192, 0.9);
}
.gx-footer__copy { color: rgba(154, 143, 192, 0.9); }
.gx-footer__legal-links { display: flex; flex-wrap: wrap; gap: 1.1rem; }
.gx-footer__legal-link { transition: color 0.25s ease; }
.gx-footer__legal-link:hover { color: var(--gx-star); }
.gx-footer__icp { color: rgba(154, 143, 192, 0.75); }

.gx-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.85rem;
  font-family: var(--gx-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--gx-mute);
  border: 1px solid var(--gx-line);
  border-radius: var(--gx-radius);
  transition: color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.gx-to-top::before {
  content: "";
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-bottom: 6px solid currentColor;
}
.gx-to-top:hover {
  color: var(--gx-star);
  border-color: var(--gx-cyan);
  box-shadow: 0 0 16px rgba(79, 209, 224, 0.22);
}

/* ---------- reveal ---------- */
html.gx-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.22, 0.7, 0.24, 1);
}
html.gx-reveal [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- responsive ---------- */
@media (max-width: 1080px) {
  .gx-header__actions .gx-btn--ghost { display: none; }
  .gx-nav__list { gap: 1rem; }
  .gx-nav__link { font-size: 0.82rem; letter-spacing: 0.1em; }
}

@media (max-width: 900px) {
  .gx-header__rail { display: none; }
  .gx-header__inner { flex-wrap: nowrap; }
  .gx-header__actions .gx-btn { display: none; }
  .gx-nav-toggle { display: inline-flex; }

  .gx-nav {
    position: fixed;
    top: var(--gx-header-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 55;
    display: block;
    justify-content: flex-start;
    padding: 2rem clamp(1.1rem, 5vw, 2rem) 3rem;
    overflow-y: auto;
    background:
      radial-gradient(120% 70% at 88% 0%, rgba(108, 74, 182, 0.55), transparent 68%),
      radial-gradient(90% 60% at 8% 100%, rgba(232, 111, 168, 0.28), transparent 70%),
      linear-gradient(180deg, rgba(5, 7, 15, 0.98), rgba(11, 16, 38, 0.99));
    border-top: 1px solid var(--gx-line);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity 0.32s ease, transform 0.32s ease, visibility 0.32s ease;
  }
  .gx-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .gx-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .gx-nav__item { border-bottom: 1px solid var(--gx-line); }
  .gx-nav__link {
    display: block;
    padding: 1rem 0;
    font-size: 1.02rem;
    letter-spacing: 0.16em;
  }
  .gx-nav__link::after { display: none; }
  .gx-nav__link[aria-current="page"] { padding-left: 0.9rem; }
  .gx-nav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 6px;
    height: 6px;
    margin-top: -3px;
    border-radius: 50%;
    background: var(--gx-pink);
    box-shadow: 0 0 12px rgba(232, 111, 168, 0.8);
  }
  .gx-nav__cta {
    display: grid;
    gap: 0.65rem;
    margin-top: 1.6rem;
  }
  .gx-nav__cta .gx-btn { width: 100%; padding-block: 0.85rem; }

  .gx-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .gx-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 820px) {
  .gx-grid--2,
  .gx-grid--3 { --gx-cols: 1; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; line-height: 1.8; }
  .gx-display { letter-spacing: 0.05em; }
  .gx-title { letter-spacing: 0.05em; }
  .gx-orbit--ring { width: 108vw; right: -44%; top: -12%; }
  .gx-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .gx-footer__legal { justify-content: flex-start; }
  .gx-footer__contact-item { grid-template-columns: minmax(0, 1fr); gap: 0.15rem; }
  .gx-annotation { writing-mode: horizontal-tb; }
}

/* ---------- 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;
  }
  .gx-orbit--ring { animation: none; }
  .gx-btn--primary { animation: none; }
  html.gx-reveal [data-reveal] { opacity: 1; transform: none; }
  .gx-card:hover,
  .gx-card:focus-within { transform: none; }
}