/* ==========================================================================
   大阳城CN · 共享样式表 /assets/site.css
   坐标站视觉体系：深空底 + 珠宝色分区 + 霓虹青入口 + 暖金数据
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --ink-void: #060A1C;
  --ink-deep: #0E1A44;
  --jewel-indigo: #1B2260;
  --jewel-teal: #08403E;
  --jewel-wine: #5A1730;

  --neon: #3AE7DF;
  --neon-dim: rgba(58, 231, 223, .5);
  --neon-soft: rgba(58, 231, 223, .1);
  --gold: #F3B63C;
  --gold-soft: rgba(243, 182, 60, .14);

  --frost: #E9EFFF;
  --mist: #93A0C8;
  --coral: #FF6B6B;

  --line: rgba(147, 160, 200, .22);
  --line-soft: rgba(147, 160, 200, .12);

  --font-display: "Archivo Narrow", "Oswald", "Noto Sans SC", "PingFang SC", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-data: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --shell: 1440px;
  --gutter: clamp(20px, 4vw, 56px);
  --rail: 220px;
  --header-h: 68px;
  --cut: 34px;
  --cut-sm: 11px;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html,
body { margin: 0; padding: 0; }

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }

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

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

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

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; width: 100%; }

:focus { outline: none; }

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

/* ---------- 3. 基础排版 ---------- */
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 20px);
}

body {
  background: var(--ink-void);
  color: var(--frost);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  overflow-x: clip;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-wrap: break-word;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--frost);
  text-wrap: pretty;
}

h1 { font-size: clamp(2.4rem, 6vw, 5.6rem); }
h2 { font-size: clamp(1.7rem, 3.5vw, 3rem); }
h3 { font-size: clamp(1.12rem, 1.8vw, 1.6rem); letter-spacing: -.01em; }
h4 { font-size: clamp(1rem, 1.3vw, 1.15rem); }

.main-content {
  display: block;
  min-height: 60vh;
}

/* ---------- 4. 通用工具 ---------- */
.shell {
  width: min(var(--shell), 100% - calc(var(--gutter) * 2));
  margin-inline: auto;
}

.section { padding-block: clamp(44px, 6vw, 88px); }
.section--tight { padding-block: clamp(28px, 4vw, 52px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-data);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--neon);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
  flex: none;
}

.mono {
  font-family: var(--font-data);
  letter-spacing: .02em;
}

.num {
  font-family: var(--font-data);
  font-weight: 500;
  color: var(--gold);
  letter-spacing: .02em;
}

figure { margin: 0; }
figcaption { margin-top: 10px; font-size: 13px; color: var(--mist); }

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 18px;
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: .04em;
  color: #04121A;
  background: var(--neon);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transform: translateY(-180%);
  transition: transform 180ms linear;
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 6. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(6, 10, 28, .9);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-soft);
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(147, 160, 200, .16) 0 1px, transparent 1px 56px);
  opacity: .5;
  pointer-events: none;
  z-index: 0;
}

.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(147, 160, 200, .14);
  pointer-events: none;
  z-index: 3;
}

.read-progress__fill {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--neon), var(--gold));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 120ms linear;
}

.site-header__bar {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 30px);
  min-height: var(--header-h);
  width: min(var(--shell), 100% - calc(var(--gutter) * 2));
  margin-inline: auto;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: none;
  padding: 6px 0;
}

.brand__glyph {
  width: 13px;
  height: 13px;
  flex: none;
  background: var(--neon);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  box-shadow: 0 0 14px rgba(58, 231, 223, .85);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.28rem;
  letter-spacing: .06em;
  color: var(--frost);
}

.brand__sub {
  font-family: var(--font-data);
  font-size: 9.5px;
  letter-spacing: .22em;
  color: var(--mist);
  text-transform: uppercase;
}

/* 坐标刻线 */
.header-axis {
  position: relative;
  flex: 1 1 auto;
  min-width: 24px;
  height: 1px;
  overflow: hidden;
  background: linear-gradient(90deg, rgba(147, 160, 200, .5), rgba(147, 160, 200, .05));
}

.header-axis::after {
  content: "";
  position: absolute;
  right: 0;
  top: -3px;
  width: 1px;
  height: 7px;
  background: rgba(147, 160, 200, .45);
}

.header-axis::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 5px;
  height: 5px;
  margin-top: -2.5px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 10px var(--neon);
  animation: axis-drift 4s linear infinite;
}

@keyframes axis-drift {
  0% { left: 0; opacity: 0; }
  12% { opacity: 1; }
  88% { opacity: 1; }
  100% { left: 100%; opacity: 0; }
}

/* 当前章节 */
.header-chapter {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: none;
  font-family: var(--font-data);
  font-size: 10.5px;
  letter-spacing: .16em;
  color: var(--mist);
  white-space: nowrap;
}

.header-chapter__num {
  font-size: 13px;
  color: var(--gold);
}

.header-chapter__label {
  text-transform: uppercase;
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--frost);
  background: rgba(27, 34, 96, .8);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
  flex: none;
}

.nav-toggle__bars i {
  display: block;
  height: 1.5px;
  background: var(--neon);
  transition: transform 200ms linear, opacity 160ms linear;
}

.site-header[data-open="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(4.5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-4.5px) rotate(-45deg); }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.6vw, 26px);
  flex: none;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.4vw, 24px);
}

.site-nav__list a {
  position: relative;
  display: inline-block;
  padding: 6px 2px;
  font-size: 14px;
  letter-spacing: .08em;
  color: var(--mist);
  transition: color 160ms linear;
}

.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 2px;
  background: var(--neon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 200ms linear;
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible { color: var(--frost); }

.site-nav__list a:hover::after,
.site-nav__list a:focus-visible::after { transform: scaleX(.4); }

.site-nav__list a[aria-current="page"] { color: var(--neon); }

.site-nav__list a[aria-current="page"]::after { transform: scaleX(1); }

.site-nav__utility {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-left: clamp(10px, 1.2vw, 20px);
  border-left: 1px solid var(--line);
}

.nav-utility {
  display: inline-block;
  padding: 5px 10px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist);
  background: rgba(27, 34, 96, .78);
  border-left: 2px solid rgba(58, 231, 223, .45);
  transition: color 160ms linear, background-color 160ms linear, border-color 160ms linear;
}

.nav-utility:hover,
.nav-utility:focus-visible {
  color: var(--neon);
  background: var(--neon-soft);
  border-left-color: var(--neon);
}

.site-nav__cta {
  flex: none;
  margin-left: clamp(4px, 1vw, 14px);
  white-space: nowrap;
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  font-family: var(--font-data);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: .06em;
  line-height: 1.2;
  color: var(--neon);
  background: var(--neon-soft);
  clip-path: polygon(var(--cut-sm) 0, 100% 0, 100% calc(100% - var(--cut-sm)), calc(100% - var(--cut-sm)) 100%, 0 100%, 0 var(--cut-sm));
  transition: background-color 160ms linear, color 160ms linear, box-shadow 160ms linear;
}

.btn:hover,
.btn:focus-visible {
  background: var(--neon);
  color: #04121A;
}

.btn--neon {
  background: var(--neon);
  color: #04121A;
}

.btn--neon:hover,
.btn--neon:focus-visible {
  background: #7CF3ED;
  color: #04121A;
}

.btn--ghost {
  color: var(--frost);
  background: transparent;
  box-shadow: inset 0 0 0 1px rgba(233, 239, 255, .3);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--frost);
  color: #04121A;
  box-shadow: inset 0 0 0 1px var(--frost);
}

.btn--gold {
  background: var(--gold-soft);
  color: var(--gold);
}

.btn--gold:hover,
.btn--gold:focus-visible {
  background: var(--gold);
  color: #201200;
}

/* ---------- 8. 标签 ---------- */
.tag {
  display: inline-block;
  padding: 3px 10px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mist);
  background: rgba(27, 34, 96, .8);
  border-left: 2px solid var(--neon-dim);
}

.tag--teal {
  background: rgba(8, 64, 62, .78);
  border-left-color: var(--neon);
  color: #9FE9E3;
}

.tag--wine {
  background: rgba(90, 23, 48, .78);
  border-left-color: #C4628A;
  color: #EFC2D3;
}

.tag--gold {
  background: var(--gold-soft);
  border-left-color: var(--gold);
  color: var(--gold);
}

/* ---------- 9. 面板 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--ink-deep);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.panel--indigo { background: linear-gradient(155deg, #1B2260 0%, #141A4A 100%); }
.panel--teal { background: linear-gradient(155deg, #08403E 0%, #062E34 100%); }
.panel--wine { background: linear-gradient(155deg, #5A1730 0%, #3B1026 100%); }
.panel--void { background: rgba(14, 26, 68, .55); }

.panel--outline {
  background: transparent;
  box-shadow: inset 0 0 0 1px var(--line);
}

/* ---------- 10. 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(18px, 2.4vw, 32px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 11. 坐标轴布局 ---------- */
.axis-layout {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  width: min(var(--shell), 100% - calc(var(--gutter) * 2));
  margin-inline: auto;
}

.axis-rail {
  position: sticky;
  top: calc(var(--header-h) + 28px);
  align-self: start;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 16px;
  border-left: 1px solid var(--line);
  max-height: calc(100vh - var(--header-h) - 56px);
  overflow-y: auto;
}

.axis-rail__title {
  margin-bottom: 12px;
  font-family: var(--font-data);
  font-size: 10.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist);
}

.axis-rail a {
  position: relative;
  display: block;
  padding: 8px 0;
  font-size: 14px;
  color: var(--mist);
  transition: color 150ms linear, padding-left 150ms linear;
}

.axis-rail a::before {
  content: "";
  position: absolute;
  left: -17px;
  top: 50%;
  width: 6px;
  height: 1px;
  background: var(--line);
  transition: width 150ms linear, background-color 150ms linear;
}

.axis-rail a:hover,
.axis-rail a:focus-visible { color: var(--frost); }

.axis-rail a[aria-current="true"] {
  color: var(--neon);
  padding-left: 6px;
}

.axis-rail a[aria-current="true"]::before {
  width: 14px;
  background: var(--neon);
  box-shadow: 0 0 8px var(--neon);
}

/* ---------- 12. 图像容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--ink-deep);
  background-image:
    linear-gradient(rgba(147, 160, 200, .12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(147, 160, 200, .12) 1px, transparent 1px);
  background-size: 34px 34px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--hero { aspect-ratio: 4 / 3; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--intrinsic { aspect-ratio: auto; }

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 10px 14px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--frost);
  background: rgba(6, 10, 28, .8);
}

/* ---------- 13. 正文块 ---------- */
.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(233, 239, 255, .84);
}

.prose > * + * { margin-top: 1.15em; }

.prose h2 { margin-top: 2em; }
.prose h3 { margin-top: 1.6em; }

.prose a {
  color: var(--neon);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose ul,
.prose ol {
  padding-left: 1.3em;
  list-style: disc;
}

.prose ol { list-style: decimal; }
.prose li + li { margin-top: .5em; }

.prose blockquote {
  padding-left: 18px;
  border-left: 2px solid var(--neon-dim);
  color: var(--mist);
}

.prose code {
  padding: .1em .38em;
  font-family: var(--font-data);
  font-size: .9em;
  color: var(--gold);
  background: var(--gold-soft);
}

/* ---------- 14. 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
}

.breadcrumb li + li { margin-left: 10px; }

.breadcrumb li + li::before {
  content: "›";
  margin-right: 10px;
  color: rgba(147, 160, 200, .45);
}

.breadcrumb a {
  color: var(--mist);
  transition: color 150ms linear;
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible { color: var(--neon); }

.breadcrumb [aria-current="page"] { color: var(--frost); }

/* ---------- 15. 显现动效 ---------- */
.has-js [data-reveal] {
  opacity: 0;
  transform: translate3d(-8%, 8%, 0);
  transition: opacity 240ms linear, transform 240ms linear;
}

.has-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 16. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 9vw, 120px);
  background: var(--ink-void);
  border-top: 1px solid var(--line-soft);
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 1px;
  height: 6px;
  background-image: repeating-linear-gradient(90deg, rgba(147, 160, 200, .45) 0 1px, transparent 1px 32px);
  pointer-events: none;
}

.site-footer__inner {
  width: min(var(--shell), 100% - calc(var(--gutter) * 2));
  margin-inline: auto;
  padding: clamp(44px, 6vw, 80px) 0 clamp(30px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(200px, .9fr) minmax(0, 3fr);
  gap: clamp(28px, 4vw, 64px);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.footer-brand__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.7rem;
  letter-spacing: .05em;
  color: var(--frost);
}

.footer-brand__sub {
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--mist);
}

.footer-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 11px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--mist);
  background: rgba(27, 34, 96, .7);
}

.footer-status__dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 3px rgba(58, 231, 223, .15);
  animation: coord-pulse 4s linear infinite;
}

@keyframes coord-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .32; }
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(22px, 3vw, 40px);
}

.footer-col__title {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-data);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--gold);
}

.footer-col__title::before {
  content: "";
  width: 12px;
  height: 1px;
  flex: none;
  background: var(--neon);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  font-size: 14px;
  line-height: 1.65;
}

.footer-col__list a {
  color: var(--mist);
  transition: color 150ms linear;
}

.footer-col__list a:hover,
.footer-col__list a:focus-visible { color: var(--neon); }

.footer-col__plain {
  display: block;
  font-size: 13px;
  color: var(--mist);
}

.footer-base {
  width: min(var(--shell), 100% - calc(var(--gutter) * 2));
  margin-inline: auto;
  padding: 16px 0 30px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 24px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: .03em;
  color: var(--mist);
}

.footer-base__batch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.footer-base__batch::before {
  content: "";
  width: 8px;
  height: 8px;
  flex: none;
  background: var(--jewel-wine);
  box-shadow: inset 0 0 0 1px rgba(243, 182, 60, .55);
}

.footer-base__rights { color: var(--mist); }

.footer-base__tick {
  position: relative;
  margin-left: auto;
  width: 120px;
  height: 12px;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 12px);
}

.footer-base__tick::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--neon);
  box-shadow: 0 0 8px var(--neon);
}

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1180px) {
  .header-axis { display: none; }

  .header-chapter { margin-left: auto; }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px var(--gutter) 28px;
    background: linear-gradient(180deg, #0E1A44 0%, #0A1233 100%);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 60px rgba(0, 0, 0, .55);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .site-header[data-open="true"] .site-nav { display: flex; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .site-nav__list li { border-bottom: 1px solid var(--line-soft); }

  .site-nav__list a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 4px;
    font-size: 16px;
    letter-spacing: .04em;
  }

  .site-nav__list a::after { display: none; }

  .site-nav__list a::before {
    content: "";
    width: 6px;
    height: 6px;
    flex: none;
    background: transparent;
    clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  }

  .site-nav__list a[aria-current="page"]::before {
    background: var(--neon);
    box-shadow: 0 0 10px var(--neon);
  }

  .site-nav__utility {
    flex-wrap: wrap;
    margin-top: 14px;
    padding: 18px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line-soft);
  }

  .site-nav__utility .nav-utility {
    flex: 1 1 auto;
    text-align: center;
    padding: 9px 12px;
  }

  .site-nav__cta {
    width: 100%;
    margin: 16px 0 0;
  }
}

@media (max-width: 1080px) {
  .axis-layout { grid-template-columns: minmax(0, 1fr); }

  .axis-rail {
    position: static;
    max-height: none;
    overflow: visible;
  }
}

@media (max-width: 960px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  body { font-size: 16px; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 26px;
  }

  .footer-base__tick {
    margin-left: 0;
    width: 90px;
  }

  .brand__sub { display: none; }
}

/* ---------- 18. 无障碍与减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

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