/* ============================================================
   NEXTX 官网 · 第四版「街头机能 STREET GEAR」（2026-10-22）

   组件样式全部来自设计系统 nx-core.css（nextx-ui 导出，别在那里改）。
   这里只放三类东西：
     1. 页面骨架：导航（墨/纸自动切换）、段落、logo 组合；
     2. 官网独有的三段交互：时代手风琴 / 体验序列 / 系统协同环，外加断层、联系；
     3. 设计系统组件在 1440 / 900 / 390 各断点下的流式尺寸（组件本身按固定画框设计）。

   规矩照设计系统：纸面是页面，墨色只做区块（首屏、收束宣言、页脚）；
   酸性绿一块区域只给一样「选中 / 正在发生」的东西；硬投影只给焦点上的那一个。
   ============================================================ */

:root {
  --site-wrap: 1160px;
  --site-nav-h: 68px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--site-nav-h);
  -webkit-text-size-adjust: 100%;
}
body { margin: 0; overflow-x: hidden; }
img { max-width: 100%; }
a { color: inherit; }
a.nx-btn { text-decoration: none; }
:focus-visible { outline: 2px solid var(--nx-text); outline-offset: 3px; border-radius: 4px; }

.site-wrap { width: 100%; max-width: var(--site-wrap); margin: 0 auto; padding: 0 40px; }
.site-wrap--narrow { max-width: 880px; }

.site-section { position: relative; padding: clamp(84px, 10vw, 136px) 0; }
.site-section--alt { background: var(--nx-bg-alt); }
.site-section .nx-sectionhead { margin-bottom: clamp(40px, 5vw, 64px); }
.site-section .nx-heading--display { font-size: clamp(32px, 4.4vw, 56px); }
.site-section .nx-sectionhead__ghost { font-size: clamp(112px, 14vw, 200px); }

/* 横版 logo 组合：emblem 高 H，字标 0.5597H，间距 0.18H（与 nextx-ui Wordmark horizontal 一致） */
.site-lockup { --h: 28px; display: inline-flex; align-items: center; gap: calc(var(--h) * 0.18); color: var(--nx-text); text-decoration: none; }
.site-lockup svg { display: block; flex-shrink: 0; fill: currentColor; }
.site-lockup__emblem { height: var(--h); width: calc(var(--h) * 1.0516); }
.site-lockup__word { height: calc(var(--h) * 0.5597); width: calc(var(--h) * 0.5597 * 4.6279); }
.site-lockup--foot { --h: 30px; }
/* 16-24px 换小版标志（NEXTX-micro-kit：简化内部转折、放大负形），32px 以上用完整标志 */
.site-lockup .site-lockup__micro { display: none; height: var(--h); width: calc(var(--h) * 0.9825); }

/* ---------- 导航 ----------
   压在墨色首屏上时是 ink 作用域、无底色；滚过首屏换成纸面磨砂（site.js 切 .nx-ink / .nx-paper）。 */
.site-nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--site-nav-h);
  transition: background-color var(--nx-dur-base) var(--nx-ease), box-shadow var(--nx-dur-base) var(--nx-ease), color var(--nx-dur-base) var(--nx-ease);
}
.site-nav.nx-paper:not(.nx-sitenav--solid) { background-color: transparent; }

/* ---------- 首屏 ---------- */
.site-hero {
  min-height: 100vh;
  min-height: 100svh;
  padding: calc(var(--site-nav-h) + 40px) 40px 120px;
}
.site-hero .nx-hero__title { font-size: clamp(56px, 7.2vw, 112px); }
.site-hero .nx-hero__inner { animation: site-rise 0.9s var(--nx-ease) both; }
@keyframes site-rise { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: none; } }

/* ---------- 01 THE SHIFT · 时代手风琴 ----------
   一次只展开一格；收起的两格是石色竖条，展开的是卡片白；「沉浸 · 我们在这里」展开时是墨色面板。
   JS 只切 .is-open，宽度靠 flex 过渡。 */
.eras { margin: 0 0 clamp(56px, 7vw, 88px); }
.eras__rail { position: relative; height: 3px; border-radius: 2px; overflow: hidden; background: var(--nx-line-mid); }
.eras__prog { position: absolute; left: 0; top: 0; height: 100%; width: 0; background: var(--nx-text); }
.eras__band { display: flex; gap: 10px; margin-top: 12px; height: clamp(320px, 34vw, 440px); }

.era {
  position: relative;
  flex: 1 1 0;
  min-width: 96px;
  overflow: hidden;
  margin: 0;
  padding: 0;
  font: inherit;
  color: var(--nx-text);
  text-align: left;
  -webkit-appearance: none;
  appearance: none;
  border: 0;
  border-radius: var(--nx-radius);
  background: var(--nx-surface-2);
  cursor: pointer;
  transition: flex 1s var(--nx-ease), background-color 0.6s var(--nx-ease), box-shadow 0.6s var(--nx-ease), color 0.6s var(--nx-ease);
}
.era.is-open { flex: 3 1 0; background: var(--nx-surface); box-shadow: inset 0 0 0 var(--nx-bw) var(--nx-line-strong); }
.era--now.is-open { background: var(--nx-ink); color: var(--nx-paper); box-shadow: none; }

.era__mini {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 96px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 26px 0;
  transition: opacity 0.45s var(--nx-ease);
}
.era.is-open .era__mini { opacity: 0; }
.era__vert {
  writing-mode: vertical-rl;
  font-style: normal;
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: var(--nx-weight-black);
  letter-spacing: 0.14em;
  color: var(--nx-text-dim);
}
.era--now .era__vert { color: var(--nx-text); }
.era__idx {
  position: relative;
  font-style: normal;
  font-family: var(--nx-font-mono);
  font-size: 11.5px;
  font-weight: var(--nx-weight-bold);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--nx-text-faint);
}
.era__tick { width: 10px; height: 10px; border-radius: 50%; background: var(--nx-line-mid); }
/* 「沉浸」收起时也留一个酸绿点：现在这一格 */
.era--now .era__tick { background: var(--nx-acid); box-shadow: 0 0 0 1.5px var(--nx-ink); }

.era__full {
  position: absolute;
  inset: 0;
  padding: clamp(22px, 2.8vw, 40px);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  opacity: 0;
  transition: opacity 0.6s var(--nx-ease);
}
.era.is-open .era__full { opacity: 1; }
.era__full .era__idx { margin-bottom: auto; }
.era__ghost {
  position: absolute;
  right: 0.1em;
  top: -0.08em;
  font-style: normal;
  font-family: var(--nx-font-display);
  font-stretch: var(--nx-stretch-condensed);
  font-weight: var(--nx-weight-black);
  font-size: clamp(120px, 15vw, 220px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--nx-line-mid);
  pointer-events: none;
}
.era__tag {
  position: absolute;
  right: clamp(22px, 2.8vw, 40px);
  top: clamp(22px, 2.8vw, 40px);
  font-style: normal;
  padding: 6px 13px;
  border-radius: var(--nx-radius-pill);
  background: var(--nx-acid);
  color: var(--nx-ink);
  font-size: 12px;
  font-weight: var(--nx-weight-black);
  letter-spacing: 0.04em;
}
.era__name {
  position: relative;
  font-style: normal;
  margin-bottom: 14px;
  font-size: clamp(48px, 6.6vw, 104px);
  font-weight: var(--nx-weight-black);
  line-height: 1;
  letter-spacing: -0.035em;
}
.era__desc {
  position: relative;
  font-style: normal;
  font-size: clamp(14px, 1.4vw, 18px);
  font-weight: var(--nx-weight-bold);
  letter-spacing: 0.14em;
  color: var(--nx-text-dim);
}
.era--now.is-open .era__ghost { -webkit-text-stroke-color: rgba(242, 238, 229, 0.22); }
.era--now.is-open .era__full .era__idx { color: rgba(242, 238, 229, 0.5); }
.era--now.is-open .era__desc { color: rgba(242, 238, 229, 0.7); }

/* ---------- 断层 ---------- */
.gap { display: grid; grid-template-columns: 1.1fr 1fr; gap: clamp(32px, 5vw, 64px); align-items: stretch; }
.gap__title { margin-bottom: 18px; }
.gap__list { margin: 0; padding: 0; list-style: none; border-top: var(--nx-bw) solid var(--nx-line-strong); }
.gap__list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--nx-line);
}
.gap__list strong { font-size: clamp(17px, 1.8vw, 22px); font-weight: var(--nx-weight-black); letter-spacing: -0.01em; white-space: nowrap; }
.gap__list span { font-size: 14px; color: var(--nx-text-dim); text-align: right; }
/* 这一格就是 NEXTX 要填的 —— 本段的焦点：墨线 + 硬投影 */
.gap__col--blank {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(26px, 3vw, 40px);
  border-radius: var(--nx-radius);
  background: var(--nx-surface);
  box-shadow: inset 0 0 0 var(--nx-bw) var(--nx-line-strong), var(--nx-shadow-hard);
}
.gap__lead { margin: 0 0 16px; font-size: clamp(21px, 2.4vw, 30px); line-height: 1.5; font-weight: var(--nx-weight-black); letter-spacing: -0.015em; }
.gap__lead em {
  font-style: normal;
  color: var(--nx-mark-text);
  background: linear-gradient(transparent 56%, var(--nx-mark) 56%, var(--nx-mark) 94%, transparent 94%);
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.gap__note { margin: 0; font-size: clamp(14.5px, 1.4vw, 16px); line-height: 1.85; color: var(--nx-text-dim); }

/* ---------- 四栏（引擎四层 / ZERO 四特性） ---------- */
.site-cols--4 { grid-template-columns: repeat(4, 1fr); }
.site-cols--4 > .nx-columns__item:first-child { padding-left: 0; }
.site-cols--4 > .nx-columns__item:last-child { padding-right: 0; border-right: 0; }
.site-cols--4 .nx-columns__ghost { font-size: clamp(96px, 9vw, 128px); }

/* 引擎四层的小动效：内联 SVG，卡片进入视口（.layer.in）才开始播 */
.layer__viz { height: 56px; }
.layer__viz svg { width: 74px; height: 56px; overflow: visible; }
.viz-tilt { transform-origin: 36px 33px; }
.layer.in .viz-tilt { animation: viz-tilt 4.2s ease-in-out infinite; }
@keyframes viz-tilt { 0%, 100% { transform: rotate(-9deg); } 50% { transform: rotate(9deg); } }
.viz-base, .viz-mount { opacity: 0.45; }
.viz-pivot { fill: var(--nx-paper); }
.layer.in .viz-scan { animation: viz-scan 3.6s ease-in-out infinite; }
@keyframes viz-scan {
  0%, 100% { transform: translateY(-11px); opacity: 0; }
  15% { opacity: 1; }
  50% { transform: translateY(11px); opacity: 1; }
  85% { opacity: 0; }
}
.viz-iris { opacity: 0.55; transform-origin: 36px 28px; }
.layer.in .viz-iris { animation: viz-iris 3.6s ease-in-out infinite; }
@keyframes viz-iris { 0%, 100% { transform: scale(1); opacity: 0.55; } 50% { transform: scale(1.2); opacity: 1; } }
.viz-ring { opacity: 0.35; }
.viz-wave { transform-origin: 36px 28px; opacity: 0; }
.layer.in .viz-wave { animation: viz-wave 3.2s ease-out infinite; }
.layer.in .viz-wave--2 { animation-delay: 1.06s; }
.layer.in .viz-wave--3 { animation-delay: 2.13s; }
@keyframes viz-wave { 0% { transform: scale(0.35); opacity: 0; } 22% { opacity: 0.85; } 100% { transform: scale(1.5); opacity: 0; } }
.viz-axis { opacity: 0.35; }
.viz-line { stroke-dasharray: 62; stroke-dashoffset: 62; }
.layer.in .viz-line { animation: viz-draw 3.4s ease-in-out infinite; }
@keyframes viz-draw { 0% { stroke-dashoffset: 62; } 45%, 72% { stroke-dashoffset: 0; } 100% { stroke-dashoffset: 0; } }
/* 沿折线跑的那一点：酸绿实心 + 墨圈 */
.viz-dot { fill: var(--nx-acid); stroke: var(--nx-ink); stroke-width: 1.5; opacity: 0; }
.layer.in .viz-dot { animation: viz-dot 3.4s linear infinite; }
@keyframes viz-dot { 0%, 4% { opacity: 0; } 10%, 66% { opacity: 1; } 74%, 100% { opacity: 0; } }

/* ---------- 03 ZERO ---------- */
.site-shot .nx-media__box { aspect-ratio: 21 / 9; }
.site-seq { margin: clamp(52px, 6vw, 80px) 0 clamp(52px, 6vw, 76px); }
.site-seq .nx-seq__list { grid-template-columns: repeat(5, 1fr); }
.site-seq .nx-seq__label { font-size: clamp(15px, 1.5vw, 19px); }
.site-seq .nx-seq__step { cursor: default; }
.traits { margin-bottom: clamp(64px, 8vw, 100px); }
.site-punch .nx-punch__text { font-size: clamp(30px, 4.6vw, 64px); }

/* ---------- 04 UNIVERSE ---------- */
.site-stat .nx-figure__value { font-size: clamp(64px, 8vw, 112px); }
.site-index .nx-index__title { white-space: nowrap; }
/* 路线图宽 681-1000 时还是五列：收窄固定列，名字不折行（680 以下交给设计系统的容器查询堆叠） */
@container (min-width: 681px) and (max-width: 1000px) {
  .site-index .nx-index__row { grid-template-columns: 88px minmax(150px, 1fr) 84px minmax(0, 1fr) 76px; gap: 6px 18px; }
  .site-index .nx-index__row--live .nx-index__title { font-size: 28px; }
}

/* ---------- 05 CAPABILITY · 系统协同环 ----------
   SVG 用 viewBox 缩放，五个标签按百分比定位一起缩。纸面上：淡墨轨道 + 刻度，石色弧段，
   选中的那段酸绿 + 硬投影，中心是墨色圆盘配 emblem。窄屏整个环隐藏，标签退化成清单。 */
.sys { margin-top: 8px; }
.sys__band { position: relative; aspect-ratio: 1246 / 680; }
.sys__svg { position: absolute; inset: 0; width: 100%; height: 100%; display: block; overflow: visible; }
.sys__orbit { fill: none; stroke: var(--nx-line-mid); stroke-width: 1.2; }
.sys__dashring {
  fill: none;
  stroke: var(--nx-text);
  stroke-opacity: 0.32;
  stroke-width: 1.5;
  stroke-dasharray: 2 12;
  transform-box: view-box;
  transform-origin: 623px 320px;
  animation: sys-spin 46s linear infinite;
}
.sys__arc {
  fill: none;
  stroke: var(--nx-surface-3);
  stroke-width: 26;
  transition: stroke 0.5s var(--nx-ease), filter 0.5s var(--nx-ease);
}
.sys__arc.is-on { stroke: var(--nx-acid); filter: drop-shadow(3px 3px 0 var(--nx-ink)); }
.sys__pulse { fill: none; stroke: var(--nx-text); stroke-opacity: 0.2; stroke-width: 1.2; animation: sys-pulse 3s ease-in-out infinite; }
.sys__disc { fill: var(--nx-ink); }
@keyframes sys-spin { to { transform: rotate(360deg); } }
@keyframes sys-pulse { 0%, 100% { opacity: 0.35; } 50% { opacity: 1; } }

.sys__core {
  position: absolute;
  left: 50%;
  top: 47.06%;
  transform: translate(-50%, -50%);
  width: 15%;
  text-align: center;
  pointer-events: none;
  color: var(--nx-paper);
}
.sys__core-idx { display: block; font-family: var(--nx-font-mono); font-size: clamp(9px, 0.9vw, 11px); font-weight: var(--nx-weight-bold); letter-spacing: 0.1em; color: var(--nx-acid); }
.sys__core-emblem { display: block; width: clamp(28px, 3.4vw, 42px); aspect-ratio: 1.0516; height: auto; margin: clamp(6px, 0.8vw, 10px) auto; fill: currentColor; }
.sys__core-title { display: block; font-size: clamp(10px, 1.05vw, 13px); font-weight: var(--nx-weight-bold); line-height: 1.4; color: rgba(242, 238, 229, 0.72); }

.sys__nodes { margin: 0; padding: 0; list-style: none; }
.sys__node { position: absolute; left: var(--x); top: var(--y); transform: translate(-50%, -50%); }
.sys__btn {
  display: block;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
  font: inherit;
  color: inherit;
  text-align: center;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
}
.sys__idx {
  display: block;
  margin-bottom: 8px;
  font-family: var(--nx-font-mono);
  font-size: 11px;
  font-weight: var(--nx-weight-medium);
  letter-spacing: 0.1em;
  color: var(--nx-text-faint);
  transition: color 0.4s var(--nx-ease);
}
.sys__title {
  display: inline-block;
  white-space: nowrap;
  padding: 0 0.06em;
  font-size: clamp(15px, 1.8vw, 23px);
  font-weight: var(--nx-weight-black);
  letter-spacing: -0.02em;
  color: var(--nx-text-dim);
  transition: color 0.4s var(--nx-ease), background-size 0.4s var(--nx-ease);
  background: linear-gradient(transparent 56%, var(--nx-mark) 56%, var(--nx-mark) 94%, transparent 94%) no-repeat left / 0% 100%;
}
.sys__node.is-on .sys__idx { color: var(--nx-text); font-weight: var(--nx-weight-bold); }
.sys__node.is-on .sys__title { color: var(--nx-text); background-size: 100% 100%; }
.sys__detail { display: none; }

.sys__panel {
  position: relative;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin: 10px 0 0;
  padding: 22px 26px 22px 30px;
  overflow: hidden;
  border-radius: var(--nx-radius);
  background: var(--nx-surface);
  box-shadow: inset 0 0 0 1px var(--nx-line);
}
.sys__panel::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 5px; background: var(--nx-text); }
.sys__panel-idx { min-width: 64px; font-family: var(--nx-font-mono); font-size: 12px; font-weight: var(--nx-weight-bold); letter-spacing: 0.08em; }
.sys__panel-title { min-width: 200px; font-size: clamp(18px, 2vw, 24px); font-weight: var(--nx-weight-black); letter-spacing: -0.02em; }
.sys__panel-detail { font-size: clamp(14px, 1.4vw, 16px); line-height: 1.7; color: var(--nx-text-dim); }

/* ---------- 收束宣言（墨色通栏 + 中心爆散） ---------- */
.site-statement { padding: clamp(110px, 15vw, 200px) 40px; }
.site-statement .nx-punch__text { font-size: clamp(30px, 5vw, 64px); }
.site-statement .nx-punch__kicker,
.site-statement .nx-punch__text,
.site-statement .nx-punch__after { text-shadow: 0 0 18px var(--nx-ink), 0 0 36px var(--nx-ink); }

/* ---------- 联系 ---------- */
.contact { display: flex; align-items: flex-start; justify-content: center; gap: clamp(28px, 6vw, 72px); flex-wrap: wrap; }
.contact__col { display: flex; flex-direction: column; align-items: center; gap: 14px; flex: 0 1 auto; max-width: 100%; }
.contact__col:first-child { padding-top: clamp(0px, 4vw, 52px); }
.contact__label {
  margin: 0;
  font-family: var(--nx-font-mono);
  font-size: 11.5px;
  font-weight: var(--nx-weight-medium);
  letter-spacing: var(--nx-tracking-eyebrow);
  text-transform: uppercase;
  color: var(--nx-text-faint);
}
.contact__mail {
  padding: 0 0.08em 6px;
  font-family: var(--nx-font-display);
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--nx-text);
  text-decoration: none;
  border-bottom: var(--nx-bw) solid var(--nx-line-strong);
  word-break: break-all;
  background: linear-gradient(transparent 56%, var(--nx-mark) 56%, var(--nx-mark) 94%, transparent 94%) no-repeat left / 0% 100%;
  transition: background-size var(--nx-dur-base) var(--nx-ease);
}
.contact__mail:hover { background-size: 100% 100%; }
.contact__divider { width: 1px; align-self: stretch; min-height: 140px; background: var(--nx-line-mid); }
/* 二维码保留反色码（白码点 + 黑底，静区已在图里补黑）：在纸面上就是一块墨色卡片 */
.contact__qr { margin: 0; display: flex; flex-direction: column; align-items: center; gap: 12px; }
.contact__qr img { width: clamp(140px, 16vw, 176px); height: auto; border-radius: var(--nx-radius); background: var(--nx-ink); }
.contact__qr figcaption { font-size: 12.5px; color: var(--nx-text-dim); }

/* ---------- 页脚 ---------- */
.site-foot { padding: 52px 40px 44px; }

/* ---------- 入场 ---------- */
.reveal { opacity: 0; transform: translateY(18px); }
.reveal.in { opacity: 1; transform: none; transition: opacity 0.7s var(--nx-ease), transform 0.7s var(--nx-ease); }
.site-cols--4 > .reveal:nth-child(2), .nx-index > .reveal:nth-child(2), .gap__list > .reveal:nth-child(2) { transition-delay: 0.06s; }
.site-cols--4 > .reveal:nth-child(3), .nx-index > .reveal:nth-child(3), .gap__list > .reveal:nth-child(3) { transition-delay: 0.12s; }
.site-cols--4 > .reveal:nth-child(4), .nx-index > .reveal:nth-child(4) { transition-delay: 0.18s; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1000px) {
  .site-cols--4 { grid-template-columns: repeat(2, 1fr); }
  .site-cols--4 > .nx-columns__item { padding: 26px 22px 28px; border-right: 1px solid var(--nx-line); }
  .site-cols--4 > .nx-columns__item:nth-child(odd) { padding-left: 0; }
  .site-cols--4 > .nx-columns__item:nth-child(even) { padding-right: 0; border-right: 0; }
  .site-cols--4 > .nx-columns__item:nth-child(n + 3) { border-top: 1px solid var(--nx-line); }
}

@media (max-width: 940px) {
  .gap { grid-template-columns: 1fr; }
  .nx-sectionhead__aside .nx-figure--end { align-items: flex-start; text-align: left; }
}

/* 手风琴转竖版：收起态从竖排窄条变成横向短栏 */
@media (max-width: 880px) {
  .eras__band { flex-direction: column; gap: 8px; height: clamp(440px, 110vw, 600px); }
  .era { min-width: 0; min-height: 72px; }
  .era__mini {
    right: 0;
    width: auto;
    height: 72px;
    bottom: auto;
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    gap: 18px;
    padding: 0 22px;
  }
  .era__vert { writing-mode: horizontal-tb; font-size: 22px; letter-spacing: 0.08em; }
  .era__tick { margin-left: auto; }
  .era__ghost { font-size: 132px; }
  .era__name { font-size: 56px; }
}

/* 系统环退化成清单：SVG 全隐，标签回到文档流，选中项左侧一条墨条 */
@media (max-width: 860px) {
  .sys__band { aspect-ratio: auto; border-top: var(--nx-bw) solid var(--nx-line-strong); }
  .sys__svg, .sys__core { display: none; }
  .sys__node {
    position: relative;
    left: auto;
    top: auto;
    transform: none;
    padding: 18px 0 18px 18px;
    border-bottom: 1px solid var(--nx-line);
  }
  .sys__node::before { content: ""; position: absolute; left: 0; top: 18px; bottom: 18px; width: 4px; border-radius: 2px; background: transparent; transition: background-color 0.3s var(--nx-ease); }
  .sys__node.is-on::before { background: var(--nx-text); }
  .sys__btn { width: 100%; text-align: left; }
  .sys__idx { margin-bottom: 6px; }
  .sys__title { white-space: normal; font-size: 19px; color: var(--nx-text); }
  .sys__detail { display: block; margin: 6px 0 0; font-size: 14px; line-height: 1.8; color: var(--nx-text-dim); }
  .sys__panel { display: none; }
}

/* 体验序列转竖版：轨道竖起来，--nx-seq-pct 从宽度改喂高度 */
@media (max-width: 720px) {
  .site-seq { display: grid; grid-template-columns: 2px 1fr; gap: 0 22px; }
  .site-seq .nx-seq__rail { height: auto; width: 2px; }
  .site-seq .nx-seq__fill { width: 100%; height: var(--nx-seq-pct); }
  .site-seq .nx-seq__head { left: 1px; top: var(--nx-seq-pct); margin: -6px 0 0 -6px; }
  .site-seq .nx-seq__list { grid-template-columns: 1fr; }
  .site-seq .nx-seq__step,
  .site-seq .nx-seq__step + .nx-seq__step { display: grid; grid-template-columns: auto 1fr; column-gap: 14px; align-items: baseline; padding: 13px 0; }
  .site-seq .nx-seq__no { margin: 0; }
  .site-seq .nx-seq__label { font-size: 16px; }
}

@media (max-width: 680px) {
  :root { --site-nav-h: 60px; }
  .site-wrap { padding: 0 20px; }
  .site-nav { padding: 0 16px; }
  .site-nav .site-lockup { --h: 24px; }
  .site-nav .site-lockup .site-lockup__emblem { display: none; }
  .site-nav .site-lockup .site-lockup__micro { display: block; }
  .site-nav .nx-sitenav__links { gap: 16px; }
  .site-nav .nx-sitenav__link { font-size: 13px; }
  .site-nav .nx-sitenav__link:nth-child(1),
  .site-nav .nx-sitenav__link:nth-child(4),
  .site-nav .nx-sitenav__link:nth-child(5) { display: none; }

  /* 首屏用设计系统的手机档 */
  .site-hero { min-height: 92vh; min-height: 92svh; padding: calc(var(--site-nav-h) + 28px) 20px 84px; }
  .site-hero .nx-hero__kicker { font-size: 10px; letter-spacing: 0.12em; margin-bottom: 14px; }
  .site-hero .nx-hero__title { font-size: clamp(46px, 14vw, 60px); margin-bottom: 14px; }
  .site-hero .nx-hero__sub { font-size: 15px; letter-spacing: 0.06em; margin-bottom: 14px; }
  .site-hero .nx-hero__desc { font-size: 14px; line-height: 1.85; }
  .site-hero .nx-hero__actions { margin-top: 24px; }
  .site-hero .nx-hero__meta { display: none; }

  .site-section .nx-sectionhead__lead { font-size: 15px; }
  .site-section .nx-sectionhead__ghost { display: none; }
  .gap__list li { flex-direction: column; align-items: flex-start; gap: 4px; }
  .gap__list span { text-align: left; }
  .site-statement { padding: 96px 20px; }
  .site-foot { flex-direction: column; align-items: center; text-align: center; padding: 44px 20px 36px; }
  .site-foot .nx-sitefoot__brand { align-items: center; }
  .site-foot .nx-sitefoot__legal { text-align: center; }
  .site-foot .nx-sitefoot__beian { flex-direction: column; align-items: center; gap: 4px; }
  .site-foot .nx-sitefoot__sep { display: none; }
}

@media (max-width: 560px) {
  .site-cols--4 { grid-template-columns: 1fr; }
  .site-cols--4 > .nx-columns__item,
  .site-cols--4 > .nx-columns__item:nth-child(odd),
  .site-cols--4 > .nx-columns__item:nth-child(even) { padding: 22px 0 24px; border-right: 0; }
  .site-cols--4 > .nx-columns__item + .nx-columns__item { border-top: 1px solid var(--nx-line); }
  .contact__divider { display: none; }
}

@media (max-width: 400px) {
  .site-nav .nx-sitenav__link:nth-child(2) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

@media print {
  .site-nav, .nx-hero__scroll, .nx-strands { display: none; }
}