/* ============================================================
   幻影体育安装 · /assets/site.css
   共享外壳样式：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

/* ---------- 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 {
  margin: 0;
}

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

a { color: inherit; }

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

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

:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 6px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B0B14;
  --ink-2: #14142A;
  --violet: #6C2BD9;
  --violet-lite: #A66BFF;
  --lime: #C6FF3D;
  --lime-lite: #EFFF9E;
  --paper: #F2ECE1;
  --paper-mute: #C9C3B6;
  --coral: #FF5C7A;
  --cyan: #29E0C8;

  --grad-neon: linear-gradient(100deg, #6C2BD9 0%, #A66BFF 46%, #C6FF3D 100%);
  --grad-soft: linear-gradient(160deg, rgba(108, 43, 217, .34), rgba(11, 11, 20, 0) 68%);

  --shell: 1240px;
  --pad: clamp(16px, 4vw, 40px);
  --r: 18px;
  --r-sm: 10px;

  --font-head: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "DejaVu Sans Mono",
    "Courier New", monospace;

  --shadow-deep: 0 18px 44px rgba(0, 0, 0, .42);
  --shadow-neon: 0 14px 34px rgba(108, 43, 217, .34);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100%;
  background-color: var(--ink);
  background-image:
    radial-gradient(1200px 620px at 84% -12%, rgba(108, 43, 217, .38), transparent 64%),
    radial-gradient(900px 520px at 4% 8%, rgba(41, 224, 200, .10), transparent 60%),
    linear-gradient(rgba(242, 236, 225, .032) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 236, 225, .032) 1px, transparent 1px);
  background-size: auto, auto, 64px 64px, 64px 64px;
  background-repeat: no-repeat, no-repeat, repeat, repeat;
  color: var(--paper);
  font-family: var(--font-head);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, .h1 {
  font-size: clamp(2.5rem, 7.4vw, 6rem);
  line-height: .98;
  font-weight: 900;
  letter-spacing: -.025em;
  font-stretch: 88%;
}

h2, .h2 {
  font-size: clamp(1.7rem, 3.8vw, 2.75rem);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -.015em;
}

h3, .h3 {
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  line-height: 1.28;
  font-weight: 800;
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

strong { font-weight: 800; color: var(--lime-lite); }

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

/* ---------- 4. 布局壳与段落 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.section {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0;
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px 24px;
  margin-bottom: clamp(24px, 3.4vw, 42px);
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(242, 236, 225, .12);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--grad-neon);
  border-radius: 2px;
}

.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--aside { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); }

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, rgba(166, 107, 255, .7), rgba(198, 255, 61, .35), transparent);
}

.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;
}

.text-mute { color: var(--paper-mute); }

.index-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .22em;
  color: var(--violet-lite);
}

.note-vertical {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .42em;
  text-transform: uppercase;
  color: var(--paper-mute);
}

/* ---------- 5. 按钮 / 标签 / 面板 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: .02em;
  transition: transform .2s ease, box-shadow .24s ease,
    background-color .22s ease, color .22s ease, border-color .22s ease;
}

.btn:hover { transform: translateY(-2px); }

.btn--primary {
  background: var(--lime);
  color: var(--ink);
  box-shadow: 0 12px 30px rgba(198, 255, 61, .22);
}

.btn--primary:hover {
  background: linear-gradient(100deg, var(--lime-lite), var(--lime));
  box-shadow: 0 16px 38px rgba(198, 255, 61, .34);
}

.btn--ghost {
  border-color: rgba(198, 255, 61, .45);
  color: var(--lime-lite);
  background: rgba(20, 20, 42, .55);
}

.btn--ghost:hover {
  border-color: var(--lime);
  color: var(--lime);
  background: rgba(108, 43, 217, .26);
}

.btn--quiet {
  border-color: rgba(242, 236, 225, .22);
  color: var(--paper-mute);
}

.btn--quiet:hover {
  color: var(--paper);
  border-color: rgba(242, 236, 225, .55);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid rgba(242, 236, 225, .22);
  background: rgba(20, 20, 42, .62);
  color: var(--paper-mute);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  white-space: nowrap;
}

.tag--lime { color: var(--lime); border-color: rgba(198, 255, 61, .45); background: rgba(198, 255, 61, .08); }
.tag--violet { color: var(--violet-lite); border-color: rgba(166, 107, 255, .45); background: rgba(108, 43, 217, .18); }
.tag--coral { color: var(--coral); border-color: rgba(255, 92, 122, .45); background: rgba(255, 92, 122, .1); }
.tag--cyan { color: var(--cyan); border-color: rgba(41, 224, 200, .45); background: rgba(41, 224, 200, .1); }

.panel {
  padding: clamp(20px, 3vw, 32px);
  border-radius: var(--r);
  background: var(--ink-2);
  border: 1px solid rgba(242, 236, 225, .1);
}

.glass {
  background: rgba(20, 20, 42, .62);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(166, 107, 255, .28);
  border-radius: var(--r);
  box-shadow: var(--shadow-deep);
  transition: border-color .24s ease, transform .28s cubic-bezier(.2, .9, .25, 1);
}

.glass:hover { border-color: rgba(198, 255, 61, .45); transform: translateY(-6px); }

.paper {
  background: var(--paper);
  color: #1A1A24;
  border-radius: var(--r);
}

/* ---------- 6. 正文层 ---------- */
.prose {
  max-width: 720px;
  font-size: 17px;
  line-height: 1.85;
  color: rgba(242, 236, 225, .86);
}

.prose h2,
.prose h3 { margin: 1.5em 0 .5em; color: var(--paper); }
.prose h2:first-child,
.prose h3:first-child { margin-top: 0; }
.prose ul,
.prose ol { margin: 0 0 1.1em; padding-left: 1.25em; list-style: disc; }
.prose li { margin-bottom: .45em; }
.prose a { color: var(--lime); text-underline-offset: 3px; }
.prose blockquote {
  margin: 0 0 1.2em;
  padding-left: 16px;
  border-left: 2px solid var(--violet-lite);
  color: var(--paper-mute);
}

.prose--paper {
  max-width: none;
  padding: clamp(22px, 3.4vw, 46px);
  background: var(--paper);
  color: #1F1F2A;
  border-radius: var(--r);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .38);
}

.prose--paper h2,
.prose--paper h3 { color: #12121C; }
.prose--paper a { color: var(--violet); }
.prose--paper strong { color: #12121C; }

/* ---------- 7. 面包屑 ---------- */
.breadcrumbs {
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--paper-mute);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(166, 107, 255, .75);
}

.breadcrumbs a { color: var(--paper-mute); text-decoration: none; }
.breadcrumbs a:hover { color: var(--lime); }
.breadcrumbs [aria-current="page"] { color: var(--lime); }

/* ---------- 8. 数据与媒体 ---------- */
.stat { display: flex; flex-direction: column; gap: 6px; }

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -.01em;
}

.stat__label {
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--paper-mute);
}

.arc {
  --arc: 0;
  position: relative;
  width: 96px;
  height: 96px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: conic-gradient(var(--lime) calc(var(--arc) * 1%), rgba(242, 236, 225, .12) 0);
}

.arc::after {
  content: "";
  position: absolute;
  inset: 9px;
  border-radius: 50%;
  background: var(--ink);
}

.arc__value {
  position: relative;
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--paper);
}

.media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--r);
  border: 1px solid rgba(166, 107, 255, .24);
  background: linear-gradient(135deg, #14142A 0%, #0B0B14 58%, rgba(108, 43, 217, .5) 100%);
}

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media--fill { aspect-ratio: auto; height: 100%; min-height: 220px; }

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

.media__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(198, 255, 61, .14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(198, 255, 61, .14) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: linear-gradient(180deg, transparent, #000 40%, #000 70%, transparent);
  -webkit-mask-image: linear-gradient(180deg, transparent, #000 40%, #000 70%, transparent);
}

.media__tag {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 2;
}

/* ---------- 9. 动效协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .42s ease, transform .44s cubic-bezier(.2, .9, .25, 1);
}

[data-reveal].is-in {
  opacity: 1;
  transform: none;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--lime);
  font-weight: 700;
  text-decoration: none;
}

.link-arrow::after {
  content: "→";
  transition: transform .2s ease;
}

.link-arrow:hover::after { transform: translateX(5px); }

/* ============================================================
   10. 头部
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  color: var(--paper);
  background: rgba(11, 11, 20, .84);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(166, 107, 255, .26);
  transition: box-shadow .28s ease, background-color .28s ease;
}

.site-header.is-stuck {
  box-shadow: 0 16px 44px rgba(0, 0, 0, .55);
  background: rgba(11, 11, 20, .94);
}

.skip-link {
  position: absolute;
  left: 14px;
  top: -70px;
  z-index: 130;
  padding: 10px 18px;
  border-radius: 0 0 12px 12px;
  background: var(--lime);
  color: var(--ink);
  font-weight: 800;
  font-size: 14px;
  text-decoration: none;
  transition: top .2s ease;
}

.skip-link:focus { top: 0; }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(242, 236, 225, .09);
  overflow: hidden;
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: var(--grad-neon);
  will-change: transform;
}

/* --- 上层 --- */
.header-top {
  border-bottom: 1px solid rgba(242, 236, 225, .08);
  background: linear-gradient(90deg, rgba(108, 43, 217, .3), rgba(11, 11, 20, 0) 62%);
}

.header-top__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2.6vw, 30px);
  min-height: 66px;
  padding-top: 8px;
  padding-bottom: 8px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  text-decoration: none;
  color: inherit;
}

.brand__mark {
  display: grid;
  gap: 3px;
  width: 28px;
}

.brand__mark i {
  display: block;
  height: 4px;
  border-radius: 2px;
  background: var(--grad-neon);
}

.brand__mark i:nth-child(2) { width: 72%; }
.brand__mark i:nth-child(3) { width: 44%; }

.brand__name {
  display: block;
  font-size: 19px;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: .04em;
}

.brand__claim {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--violet-lite);
}

.node-chip {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 0 auto;
  padding: 6px 15px;
  border-radius: 999px;
  border: 1px solid rgba(198, 255, 61, .28);
  background: rgba(20, 20, 42, .7);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--paper-mute);
  white-space: nowrap;
}

.node-chip__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 10px var(--lime);
  animation: nodePulse 2.4s ease-in-out infinite;
}

.node-chip__label { color: rgba(242, 236, 225, .72); }
.node-chip__value { color: var(--lime); }

@keyframes nodePulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .45; transform: scale(.82); }
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 15px;
  border-radius: 999px;
  border: 1px solid rgba(166, 107, 255, .5);
  background: rgba(20, 20, 42, .8);
  color: var(--lime-lite);
  font-size: 14px;
  font-weight: 700;
  z-index: 120;
}

.nav-toggle:hover { border-color: var(--lime); color: var(--lime); }

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 18px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .24s ease, opacity .2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* --- 下层 --- */
.header-bottom { background: rgba(20, 20, 42, .58); }

.header-bottom__inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.4vw, 30px);
  min-height: 56px;
}

.site-nav__title { display: none; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.1vw, 14px);
}

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 13px;
  border-radius: var(--r-sm);
  color: var(--paper-mute);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s ease, background-color .22s ease, box-shadow .24s ease;
}

.site-nav__link:hover {
  color: var(--lime-lite);
  background: rgba(108, 43, 217, .24);
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: rgba(166, 107, 255, .85);
}

.site-nav__link[aria-current="page"] {
  color: #fff;
  background: linear-gradient(100deg, rgba(108, 43, 217, .95), rgba(166, 107, 255, .6));
  box-shadow: 0 8px 22px rgba(108, 43, 217, .38), inset 0 0 0 1px rgba(198, 255, 61, .55);
}

.site-nav__link[aria-current="page"] .site-nav__num { color: var(--lime); }

.axis-strip {
  flex: 1 1 auto;
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  mask-image: linear-gradient(90deg, transparent, #000 26px, #000 calc(100% - 34px), transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 26px, #000 calc(100% - 34px), transparent);
}

.axis-strip::-webkit-scrollbar { display: none; }

.axis-strip__track {
  display: flex;
  align-items: center;
  width: max-content;
  padding: 6px 0;
}

.axis-tick {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 4px 16px;
  border-left: 1px dashed rgba(166, 107, 255, .45);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(201, 195, 182, .72);
  white-space: nowrap;
}

.axis-tick:first-child { border-left: 0; }
.axis-tick i { font-style: normal; color: var(--violet-lite); }

.axis-tick.is-active {
  color: var(--lime);
  box-shadow: inset 0 -2px 0 var(--lime);
}

.axis-tick.is-active i { color: var(--lime); }

.nav-scrim { display: none; }

/* ============================================================
   11. 页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 110px);
  padding: clamp(44px, 6vw, 80px) 0 26px;
  color: var(--paper);
  border-top: 1px solid rgba(166, 107, 255, .3);
  background-image:
    radial-gradient(900px 420px at 88% 0%, rgba(108, 43, 217, .36), transparent 62%),
    linear-gradient(180deg, #0B0B14 0%, #101024 56%, #0B0B14 100%);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--grad-neon);
  opacity: .85;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.3fr 1fr;
  gap: clamp(22px, 3vw, 46px);
}

.footer-col__title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--violet-lite);
}

.footer-brand {
  font-size: 22px;
  font-weight: 900;
  letter-spacing: .04em;
}

.footer-line {
  margin-top: 8px;
  font-size: 15px;
  color: var(--paper-mute);
}

.footer-quick {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin-top: 20px;
}

.footer-quick__item {
  display: block;
  padding: 10px 12px;
  border-radius: var(--r-sm);
  border: 1px solid rgba(198, 255, 61, .24);
  background: rgba(198, 255, 61, .05);
  color: var(--lime-lite);
  font-size: 13px;
  text-decoration: none;
  transition: background-color .22s ease, color .22s ease, border-color .22s ease;
}

.footer-quick__item:hover {
  background: rgba(198, 255, 61, .16);
  border-color: var(--lime);
  color: var(--lime);
}

.footer-links li + li { margin-top: 10px; }

.footer-links a {
  position: relative;
  display: inline-block;
  color: rgba(242, 236, 225, .78);
  font-size: 14.5px;
  text-decoration: none;
  transition: color .2s ease;
}

.footer-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 0;
  height: 1px;
  background: var(--lime);
  transition: width .24s ease;
}

.footer-links a:hover { color: var(--lime); }
.footer-links a:hover::after { width: 100%; }

.footer-contact li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(242, 236, 225, .09);
  font-size: 14px;
}

.footer-contact__label {
  flex: 0 0 68px;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--paper-mute);
}

.footer-contact__value {
  flex: 1 1 150px;
  color: rgba(242, 236, 225, .92);
  word-break: break-word;
}

.copy-btn {
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid rgba(166, 107, 255, .5);
  color: var(--violet-lite);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.copy-btn:hover {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.copy-btn[data-copied] {
  color: var(--ink);
  background: var(--lime-lite);
  border-color: var(--lime-lite);
}

.footer-version {
  font-size: 17px;
  font-weight: 800;
}

.footer-version .num {
  color: var(--lime);
  font-size: 19px;
}

.footer-meta {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--paper-mute);
}

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 11px 18px;
  border-radius: 999px;
  border: 1px solid rgba(166, 107, 255, .5);
  background: rgba(20, 20, 42, .72);
  color: var(--violet-lite);
  font-size: 14px;
  font-weight: 700;
  transition: color .22s ease, background-color .22s ease, border-color .22s ease, box-shadow .26s ease;
}

.to-top:hover {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.to-top.is-ready {
  border-color: rgba(198, 255, 61, .55);
  color: var(--lime);
  box-shadow: 0 10px 26px rgba(108, 43, 217, .35);
}

.to-top__arrow { font-family: var(--font-mono); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: clamp(30px, 4vw, 54px);
  padding-top: 20px;
  border-top: 1px solid rgba(242, 236, 225, .12);
}

.footer-tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--paper-mute);
}

/* ============================================================
   12. 响应式
   ============================================================ */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-col--brand { grid-column: 1 / -1; }
}

@media (max-width: 1000px) {
  .nav-toggle { display: inline-flex; }

  .header-bottom__inner { min-height: 48px; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 110;
    width: min(88vw, 350px);
    padding: 92px 22px 32px;
    overflow-y: auto;
    background: linear-gradient(180deg, #14142A 0%, #0B0B14 100%);
    border-left: 1px solid rgba(166, 107, 255, .38);
    box-shadow: -20px 0 60px rgba(0, 0, 0, .5);
    transform: translateX(103%);
    transition: transform .32s cubic-bezier(.2, .9, .25, 1);
  }

  .site-nav::before {
    content: "";
    position: absolute;
    left: 0;
    top: 84px;
    bottom: 0;
    width: 3px;
    background: repeating-linear-gradient(
      180deg,
      rgba(198, 255, 61, .8) 0 10px,
      transparent 10px 22px
    );
    opacity: .5;
  }

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

  .site-nav__title {
    display: block;
    margin-bottom: 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: .3em;
    text-transform: uppercase;
    color: var(--violet-lite);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .site-nav__link {
    justify-content: flex-start;
    padding: 14px 16px;
    font-size: 17px;
    border-bottom: 1px solid rgba(242, 236, 225, .08);
    border-radius: 0;
  }

  .site-nav__link[aria-current="page"] {
    border-radius: var(--r-sm);
    border-bottom-color: transparent;
  }

  .nav-scrim {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: none;
    width: 100%;
    border: 0;
    background: rgba(11, 11, 20, .74);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
  }

  html.nav-open { overflow: hidden; }
  html.nav-open .nav-scrim { display: block; }
}

@media (max-width: 820px) {
  .node-chip__label { display: none; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--aside { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .node-chip { display: none; }
  .axis-strip { display: none; }
  .header-top__inner { min-height: 60px; }
  .brand__name { font-size: 17px; }
  .brand__claim { letter-spacing: .14em; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-col--brand { grid-column: auto; }
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
  .footer-bottom { justify-content: flex-start; }
}

/* ---------- 13. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .glass:hover,
  .btn:hover { transform: none; }
}