/* ============================================================
   万博体育登录 · 共享外壳样式 /assets/site.css
   夜间数据舱：深墨绿底 + 琥珀金锚点 + 冷白正文 + 精密网格
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

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

/* 2. Tokens ----------------------------------------------- */
:root {
  --mnx-ink-950: #030908;
  --mnx-ink-900: #050e0b;
  --mnx-ink-800: #08150f;
  --mnx-ink-700: #0c1e18;
  --mnx-ink-600: #11291f;

  --mnx-line: rgba(206, 226, 216, 0.14);
  --mnx-line-2: rgba(206, 226, 216, 0.28);
  --mnx-line-3: rgba(217, 164, 65, 0.40);

  --mnx-white: #eef4f1;
  --mnx-mute: #9db3a9;
  --mnx-mute-2: #7b9088;

  --mnx-amber: #d9a441;
  --mnx-amber-2: #f0c46a;
  --mnx-amber-weak: rgba(217, 164, 65, 0.14);
  --mnx-focus: #f2c063;

  --mnx-shell: 1240px;
  --mnx-gutter: clamp(1rem, 4vw, 2.5rem);
  --mnx-radius: 2px;

  --mnx-font-display: "Arial Narrow", "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --mnx-font-body: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mnx-font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

/* 3. Base & Chinese typography ---------------------------- */
body {
  min-height: 100vh;
  background-color: var(--mnx-ink-800);
  background-image:
    repeating-linear-gradient(90deg, rgba(206, 226, 216, 0.030) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(206, 226, 216, 0.020) 0 1px, transparent 1px 96px),
    radial-gradient(1100px 620px at 84% -12%, rgba(217, 164, 65, 0.10), transparent 70%);
  color: var(--mnx-white);
  font-family: var(--mnx-font-body);
  font-size: 16px;
  line-height: 1.85;
  letter-spacing: 0.01em;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4,
.mnx-title {
  font-family: var(--mnx-font-display);
  font-stretch: condensed;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.14;
  color: var(--mnx-white);
}

p { max-width: 72ch; }

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

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

/* 4. Layout ----------------------------------------------- */
.mnx-shell {
  width: 100%;
  max-width: var(--mnx-shell);
  margin-inline: auto;
  padding-inline: var(--mnx-gutter);
}
.mnx-shell--narrow { max-width: 880px; }

.mnx-main { display: block; min-height: 40vh; }

.mnx-section { padding-block: clamp(2.5rem, 6vw, 5rem); }
.mnx-section + .mnx-section { border-top: 1px solid var(--mnx-line); }
.mnx-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem 2rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}
.mnx-section__head .mnx-title { margin-top: 0.45rem; }

.mnx-grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.75rem);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.mnx-grid--wide { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }
.mnx-grid--split { grid-template-columns: minmax(200px, 1fr) minmax(0, 2.4fr); }

/* 5. Text helpers ----------------------------------------- */
.mnx-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--mnx-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mnx-amber);
}
.mnx-eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--mnx-line-3);
}

.mnx-title { font-size: clamp(1.6rem, 3.4vw, 2.6rem); }
.mnx-title--xl { font-size: clamp(2.2rem, 6vw, 3.9rem); }

.mnx-lede {
  font-size: clamp(1rem, 1.3vw, 1.08rem);
  line-height: 1.9;
  color: var(--mnx-mute);
  max-width: 64ch;
}

.mnx-mono {
  font-family: var(--mnx-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.mnx-hr,
.mnx-divider {
  height: 1px;
  border: 0;
  background: var(--mnx-line);
}

/* 6. Buttons ---------------------------------------------- */
.mnx-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.7rem 1.15rem;
  border: 1px solid var(--mnx-line-2);
  border-radius: var(--mnx-radius);
  font-family: var(--mnx-font-body);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--mnx-white);
  background: transparent;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.mnx-btn--primary {
  background: var(--mnx-amber);
  border-color: var(--mnx-amber);
  color: #1a1204;
}
.mnx-btn--primary:hover {
  background: var(--mnx-amber-2);
  border-color: var(--mnx-amber-2);
}
.mnx-btn--ghost { color: var(--mnx-white); }
.mnx-btn--ghost:hover {
  color: var(--mnx-amber-2);
  border-color: var(--mnx-line-3);
  background: var(--mnx-amber-weak);
}

/* 7. Header ----------------------------------------------- */
.mnx-header {
  position: relative;
  z-index: 50;
}

.mnx-skip {
  position: absolute;
  left: var(--mnx-gutter);
  top: -80px;
  z-index: 80;
  padding: 0.6rem 1rem;
  background: var(--mnx-amber);
  color: #161003;
  font-size: 0.85rem;
  font-weight: 700;
  border-radius: var(--mnx-radius);
  transition: top 0.18s ease;
}
.mnx-skip:focus { top: 0.6rem; }

/* 7.1 状态条 */
.mnx-statusbar {
  background: var(--mnx-ink-950);
  border-bottom: 1px solid var(--mnx-line);
  font-size: 0.76rem;
  line-height: 1.5;
}
.mnx-statusbar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.7rem;
  min-height: 34px;
  padding-block: 0.3rem;
}
.mnx-statusbar__tag {
  font-family: var(--mnx-font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--mnx-ink-950);
  background: var(--mnx-amber);
  padding: 0.1rem 0.45rem;
  border-radius: 2px;
}
.mnx-statusbar__value {
  color: var(--mnx-amber-2);
  font-weight: 600;
  letter-spacing: 0.08em;
}
.mnx-statusbar__note { color: var(--mnx-mute); }
.mnx-statusbar__aside {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--mnx-mute-2);
}

/* 7.2 品牌说明带 */
.mnx-masthead {
  background:
    linear-gradient(180deg, rgba(217, 164, 65, 0.07), rgba(217, 164, 65, 0) 74%),
    var(--mnx-ink-800);
  border-bottom: 1px solid var(--mnx-line);
}
.mnx-masthead__inner {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding-block: clamp(0.85rem, 2vw, 1.35rem);
}
.mnx-masthead__note {
  color: var(--mnx-mute);
  font-size: 0.9rem;
  line-height: 1.6;
  max-width: 34ch;
}
.mnx-masthead__meta {
  margin-left: auto;
  display: grid;
  gap: 0.1rem;
  text-align: right;
}
.mnx-masthead__metaKey {
  font-family: var(--mnx-font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mnx-mute-2);
}
.mnx-masthead__metaVal {
  font-size: 0.98rem;
  color: var(--mnx-white);
  letter-spacing: 0.06em;
}

/* 7.3 品牌 */
.mnx-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
}
.mnx-brand__mark {
  display: inline-flex;
  align-items: flex-end;
  gap: 3px;
  height: 32px;
  padding: 6px;
  border: 1px solid var(--mnx-line-2);
  border-radius: var(--mnx-radius);
  background: var(--mnx-ink-700);
}
.mnx-brand__mark i {
  display: block;
  width: 3px;
  background: var(--mnx-amber);
}
.mnx-brand__mark i:nth-child(1) { height: 8px; }
.mnx-brand__mark i:nth-child(2) { height: 14px; }
.mnx-brand__mark i:nth-child(3) { height: 20px; }
.mnx-brand__text { display: block; }
.mnx-brand__name {
  display: block;
  font-family: var(--mnx-font-display);
  font-stretch: condensed;
  font-weight: 800;
  font-size: 1.14rem;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--mnx-white);
}
.mnx-brand__sub {
  display: block;
  font-family: var(--mnx-font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mnx-mute-2);
}

/* 7.4 栏目索引条 */
.mnx-navbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(6, 17, 13, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--mnx-line);
}
.mnx-navbar__inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: 58px;
}
.mnx-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: clamp(0.2rem, 1.2vw, 0.9rem);
}
.mnx-nav__item { position: relative; }
.mnx-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.35rem 0.55rem;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--mnx-mute);
  transition: color 0.2s ease;
}
.mnx-nav__link::after {
  content: "";
  position: absolute;
  left: 0.55rem;
  right: 0.55rem;
  bottom: 0.42rem;
  height: 2px;
  background: var(--mnx-amber);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease;
}
.mnx-nav__link:hover { color: var(--mnx-white); }
.mnx-nav__link:hover::after { transform: scaleX(0.55); }
.mnx-nav__link[aria-current="page"] { color: var(--mnx-white); }
.mnx-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.mnx-navbar__cta {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* 7.5 移动端开关 */
.mnx-navtoggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  min-height: 44px;
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--mnx-line-2);
  border-radius: var(--mnx-radius);
  color: var(--mnx-white);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.mnx-navtoggle:hover { border-color: var(--mnx-line-3); color: var(--mnx-amber-2); }
.mnx-navtoggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background-color 0.2s ease;
}
.mnx-navtoggle__bars::before,
.mnx-navtoggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s ease, top 0.2s ease;
}
.mnx-navtoggle__bars::before { top: -6px; }
.mnx-navtoggle__bars::after { top: 6px; }
.mnx-navbar[data-open] .mnx-navtoggle__bars { background: transparent; }
.mnx-navbar[data-open] .mnx-navtoggle__bars::before { top: 0; transform: rotate(45deg); }
.mnx-navbar[data-open] .mnx-navtoggle__bars::after { top: 0; transform: rotate(-45deg); }

/* 8. Footer ----------------------------------------------- */
.mnx-footer {
  position: relative;
  margin-top: clamp(3rem, 7vw, 6rem);
  background: var(--mnx-ink-950);
  border-top: 1px solid var(--mnx-line);
}
.mnx-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--mnx-line-3), transparent);
}
.mnx-footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.5fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-block: clamp(2.5rem, 6vw, 4rem);
}
.mnx-brand--footer { margin-bottom: 0.2rem; }
.mnx-footer__desc {
  margin-top: 1rem;
  max-width: 38ch;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--mnx-mute);
}
.mnx-footer__title {
  margin-bottom: 0.9rem;
  font-family: var(--mnx-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mnx-amber);
  max-width: none;
}
.mnx-footer__list {
  display: grid;
  gap: 0.55rem;
  font-size: 0.9rem;
  color: var(--mnx-mute);
}
.mnx-footer__link {
  display: inline-block;
  padding-block: 0.1rem;
  border-bottom: 1px solid transparent;
  color: var(--mnx-mute);
  transition: color 0.2s ease, border-color 0.2s ease;
}
.mnx-footer__link:hover {
  color: var(--mnx-white);
  border-bottom-color: var(--mnx-line-3);
}
.mnx-footer__fine {
  margin-top: 0.9rem;
  max-width: 36ch;
  font-size: 0.78rem;
  line-height: 1.75;
  color: var(--mnx-mute-2);
}
.mnx-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.2rem;
  padding-block: 1.1rem;
  border-top: 1px solid var(--mnx-line);
  font-size: 0.78rem;
  color: var(--mnx-mute-2);
}
.mnx-footer__copy { margin-right: auto; }
.mnx-footer__icp { font-family: var(--mnx-font-mono); letter-spacing: 0.04em; }
.mnx-footer__domain { color: var(--mnx-mute); }

/* 9. Shared components ------------------------------------ */
/* 9.1 面包屑 */
.mnx-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--mnx-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mnx-mute-2);
}
.mnx-breadcrumb__link { color: var(--mnx-mute); transition: color 0.2s ease; }
.mnx-breadcrumb__link:hover { color: var(--mnx-amber-2); }
.mnx-breadcrumb__sep { color: var(--mnx-line-3); }
.mnx-breadcrumb__current { color: var(--mnx-white); }

/* 9.2 首屏对角色块 */
.mnx-hero {
  position: relative;
  overflow: hidden;
  background: var(--mnx-ink-800);
  border-bottom: 1px solid var(--mnx-line);
}
.mnx-hero__grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, rgba(206, 226, 216, 0.05) 0 1px, transparent 1px 72px);
}
.mnx-hero__slab {
  position: absolute;
  top: 0;
  right: 0;
  height: 100%;
  width: min(54%, 640px);
  pointer-events: none;
  clip-path: polygon(24% 0, 100% 0, 100% 100%, 0 100%);
  border-left: 1px solid var(--mnx-line);
  background: linear-gradient(200deg, rgba(217, 164, 65, 0.18), rgba(217, 164, 65, 0) 64%);
}
.mnx-hero__inner {
  position: relative;
  display: grid;
  gap: 1.25rem;
  max-width: min(100%, 760px);
  padding-block: clamp(3rem, 8vw, 6.5rem);
}
.mnx-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  font-family: var(--mnx-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mnx-mute-2);
}

/* 9.3 内页页头 */
.mnx-pagehead {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--mnx-line);
  background: linear-gradient(180deg, rgba(217, 164, 65, 0.06), rgba(217, 164, 65, 0) 72%);
}
.mnx-pagehead__inner {
  position: relative;
  display: grid;
  gap: 0.9rem;
  max-width: 860px;
  padding-block: clamp(2rem, 5vw, 3.5rem);
}
.mnx-pagehead__inner .mnx-title { font-size: clamp(1.8rem, 4vw, 2.9rem); }

/* 9.4 面板 / 说明牌 */
.mnx-panel {
  padding: clamp(1rem, 2.2vw, 1.6rem);
  border: 1px solid var(--mnx-line);
  border-radius: var(--mnx-radius);
  background:
    linear-gradient(180deg, rgba(206, 226, 216, 0.035), rgba(206, 226, 216, 0) 62%),
    var(--mnx-ink-700);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}
.mnx-panel:hover { border-color: var(--mnx-line-2); }

/* 9.5 状态标签 */
.mnx-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--mnx-line-3);
  border-radius: var(--mnx-radius);
  background: var(--mnx-amber-weak);
  color: var(--mnx-amber-2);
  font-family: var(--mnx-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.mnx-tag--quiet {
  border-color: var(--mnx-line-2);
  background: transparent;
  color: var(--mnx-mute);
}

/* 9.6 对照表 */
.mnx-table {
  width: 100%;
  font-size: 0.9rem;
}
.mnx-table caption {
  padding-bottom: 0.6rem;
  text-align: left;
  font-family: var(--mnx-font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--mnx-mute-2);
}
.mnx-table th,
.mnx-table td {
  padding: 0.7rem 0.8rem;
  border-bottom: 1px solid var(--mnx-line);
  text-align: left;
  vertical-align: top;
}
.mnx-table th {
  font-family: var(--mnx-font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mnx-amber);
}
.mnx-table td { color: var(--mnx-mute); }
.mnx-table tbody tr:hover td {
  color: var(--mnx-white);
  background: rgba(206, 226, 216, 0.03);
}
.mnx-table__num {
  font-family: var(--mnx-font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--mnx-white);
}

/* 9.7 图片容器（页面阶段放图，共享层只提供底板） */
.mnx-media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--mnx-line);
  border-radius: var(--mnx-radius);
  background: var(--mnx-ink-900);
}
.mnx-media__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background-image:
    linear-gradient(135deg, rgba(217, 164, 65, 0.12), rgba(217, 164, 65, 0) 58%),
    repeating-linear-gradient(90deg, rgba(206, 226, 216, 0.06) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(0deg, rgba(206, 226, 216, 0.05) 0 1px, transparent 1px 40px);
  background-color: var(--mnx-ink-800);
}
.mnx-media__frame::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: var(--mnx-line-3);
  opacity: 0.65;
}
.mnx-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.78) brightness(0.92);
}
.mnx-media--square .mnx-media__frame { aspect-ratio: 1 / 1; }
.mnx-media--tall .mnx-media__frame { aspect-ratio: 4 / 5; }
.mnx-media__cap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  padding: 0.7rem 0.9rem;
  border-top: 1px solid var(--mnx-line);
  background: var(--mnx-ink-900);
  font-family: var(--mnx-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mnx-mute-2);
}

/* 9.8 提示条 */
.mnx-note {
  padding: 0.85rem 1rem;
  border-left: 2px solid var(--mnx-line-3);
  background: rgba(217, 164, 65, 0.06);
  color: var(--mnx-mute);
  font-size: 0.88rem;
  line-height: 1.8;
}

/* 9.9 阅读进度 */
.mnx-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 70;
  height: 2px;
  pointer-events: none;
}
.mnx-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--mnx-amber), var(--mnx-amber-2));
}

/* 9.10 章节目录 */
.mnx-toc {
  display: grid;
  gap: 0.1rem;
  border-left: 1px solid var(--mnx-line);
}
.mnx-toc__link {
  display: block;
  margin-left: -1px;
  padding: 0.5rem 0.85rem;
  border-left: 2px solid transparent;
  font-size: 0.85rem;
  color: var(--mnx-mute-2);
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}
.mnx-toc__link:hover {
  color: var(--mnx-white);
  background: rgba(206, 226, 216, 0.03);
}
.mnx-toc__link[aria-current] {
  color: var(--mnx-amber-2);
  border-left-color: var(--mnx-amber);
}

/* 9.11 返回顶部 */
.mnx-scrolltop {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 60;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--mnx-line-2);
  border-radius: var(--mnx-radius);
  background: rgba(5, 14, 11, 0.88);
  color: var(--mnx-mute);
  font-family: var(--mnx-font-mono);
  font-size: 0.95rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.mnx-scrolltop[data-visible] { opacity: 1; visibility: visible; }
.mnx-scrolltop:hover { color: var(--mnx-amber-2); border-color: var(--mnx-line-3); }

/* 9.12 滚动显现 */
.mnx-js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.mnx-js [data-reveal][data-reveal-state="in"] {
  opacity: 1;
  transform: none;
}

/* 10. Responsive ------------------------------------------ */
@media (max-width: 1200px) {
  .mnx-grid--split { grid-template-columns: minmax(180px, 1fr) minmax(0, 2.2fr); }
}

@media (max-width: 980px) {
  .mnx-footer__inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 960px) {
  html { scroll-padding-top: 76px; }

  .mnx-masthead__note { display: none; }
  .mnx-masthead__meta { text-align: right; }

  .mnx-navtoggle { display: inline-flex; }

  .mnx-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.4rem var(--mnx-gutter) 1rem;
    background: var(--mnx-ink-900);
    border-bottom: 1px solid var(--mnx-line);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
  }
  .mnx-navbar[data-open] .mnx-nav { display: flex; }

  .mnx-nav__link {
    display: flex;
    width: 100%;
    justify-content: space-between;
    padding: 0.8rem 0.25rem;
    border-bottom: 1px solid var(--mnx-line);
    font-size: 1rem;
  }
  .mnx-nav__link::after { display: none; }
  .mnx-nav__link:hover::after { transform: none; }
  .mnx-nav__link[aria-current="page"] {
    color: var(--mnx-amber-2);
    border-bottom-color: var(--mnx-line-3);
  }

  .mnx-grid--split { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  .mnx-statusbar__note { display: none; }
  .mnx-hero__slab {
    width: 80%;
    clip-path: polygon(42% 0, 100% 0, 100% 100%, 0 100%);
  }
}

@media (max-width: 600px) {
  .mnx-footer__inner { grid-template-columns: 1fr; }
  .mnx-footer__legal { font-size: 0.74rem; }
  .mnx-brand__sub { display: none; }
}

@media (max-width: 520px) {
  .mnx-statusbar__aside { display: none; }
  .mnx-masthead__meta { margin-left: 0; text-align: left; }
  .mnx-navbar__inner { flex-wrap: wrap; padding-block: 0.35rem; }
  .mnx-navbar__cta { margin-left: auto; }
  .mnx-navbar__cta .mnx-btn { padding: 0.55rem 0.7rem; font-size: 0.8rem; }
}

/* 11. Motion preference ----------------------------------- */
@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;
  }
  .mnx-js [data-reveal] { opacity: 1; transform: none; }
}