/* ============================================================
   奇亿测速 · 共享站点样式 /assets/site.css
   深空夜蓝基底 + 精密网格 + 速度带 + 直角面板
   ============================================================ */

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

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

body {
  margin: 0;
  background: var(--void-navy);
  color: var(--cold-white);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; }

[id] { scroll-margin-top: calc(var(--hdr-h) + 28px); }

/* ---------- 2. 变量 ---------- */
:root {
  --void-navy: #050A18;
  --deck-blue: #0B1630;
  --panel-blue: #142445;
  --grid-line: #22375E;
  --cyan: #35E6D2;
  --cyan-dim: #1C8C86;
  --orange: #FF7A2F;
  --amber: #FFC24B;
  --graphite: #5B6B85;
  --cold-white: #E9F1FB;
  --slate: #93A6C4;

  --maxw: 1280px;
  --gutter: 24px;
  --step: 8px;
  --radius: 2px;

  --hdr-h: 78px;
  --hdr-h-condensed: 56px;

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
    "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --font-narrow: "Archivo Narrow", "PingFang SC", "Hiragino Sans GB",
    "Source Han Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo,
    Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. 基础排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-narrow);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--cold-white);
}

h1 { font-size: clamp(40px, 6vw, 72px); }
h2 { font-size: clamp(28px, 3.6vw, 44px); }
h3 { font-size: clamp(20px, 2.1vw, 26px); }
h4 { font-size: 18px; }

p { max-width: 68ch; }

strong { color: var(--cold-white); font-weight: 700; }

.qx-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: -.01em;
}

.qx-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-narrow);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.qx-label::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--cyan);
  flex: 0 0 auto;
}

.qx-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--amber);
  flex: 0 0 auto;
}

/* ---------- 4. 布局容器 ---------- */
.qx-container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.qx-container--wide { max-width: 1480px; }

.qx-section {
  position: relative;
  padding-block: clamp(56px, 8vw, 104px);
}

.qx-section--deck {
  background: var(--deck-blue);
  border-top: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
}

.qx-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 32px 24px;
}

.qx-col-4 { grid-column: span 4; }
.qx-col-5 { grid-column: span 5; }
.qx-col-6 { grid-column: span 6; }
.qx-col-7 { grid-column: span 7; }
.qx-col-8 { grid-column: span 8; }
.qx-col-12 { grid-column: span 12; }

.qx-grid-bg {
  background-image:
    linear-gradient(to right, rgba(34, 55, 94, .38) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(34, 55, 94, .38) 1px, transparent 1px);
  background-size: 64px 64px;
}

.qx-divider {
  height: 1px;
  background: var(--grid-line);
  border: 0;
}

.qx-band {
  position: relative;
  height: 56px;
  overflow: hidden;
  border-top: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
  background-color: var(--void-navy);
  background-image: repeating-linear-gradient(90deg, var(--grid-line) 0 1px, transparent 1px 20px);
}

.qx-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(53, 230, 210, .28), transparent);
  transform: translateX(-100%);
  animation: qx-sweep 7s linear infinite;
}

@keyframes qx-sweep {
  to { transform: translateX(100%); }
}

/* ---------- 5. 按钮 ---------- */
.qx-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  font-family: var(--font-narrow);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  background: transparent;
  color: var(--cold-white);
  cursor: pointer;
  white-space: nowrap;
  transition: background-color .18s linear, border-color .18s linear,
    color .18s linear, transform .18s var(--ease);
}

.qx-btn:hover { border-color: var(--cyan); color: var(--cyan); }
.qx-btn:active { transform: translateY(1px); }

.qx-btn--primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04121A;
}
.qx-btn--primary:hover { background: #5CF0E1; border-color: #5CF0E1; color: #04121A; }

.qx-btn--signal {
  background: var(--orange);
  border-color: var(--orange);
  color: #1A0A00;
}
.qx-btn--signal:hover { background: #FF9257; border-color: #FF9257; color: #1A0A00; }

.qx-btn--ghost { background: rgba(20, 36, 69, .5); }
.qx-btn--block { width: 100%; }

/* ---------- 6. 标签 ---------- */
.qx-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--slate);
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  white-space: nowrap;
}

.qx-tag--cyan { color: var(--cyan); border-color: rgba(53, 230, 210, .42); }
.qx-tag--orange { color: var(--orange); border-color: rgba(255, 122, 47, .46); }
.qx-tag--amber { color: var(--amber); border-color: rgba(255, 194, 75, .42); }

/* ---------- 7. 页头 ---------- */
.qx-skip {
  position: fixed;
  left: 16px;
  top: -120px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: #04121A;
  font-family: var(--font-narrow);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  border-radius: var(--radius);
  transition: top .2s var(--ease);
}

.qx-skip:focus { top: 12px; }

.qx-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(5, 10, 24, .92);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--grid-line);
}

.qx-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: .45;
  pointer-events: none;
}

.qx-header__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: var(--hdr-h);
  transition: height .28s var(--ease);
}

.qx-header[data-condensed] .qx-header__inner { height: var(--hdr-h-condensed); }

/* 品牌 */
.qx-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.qx-brand__mark {
  position: relative;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  border: 1px solid var(--cyan);
  border-radius: var(--radius);
  display: grid;
  place-items: center;
}

.qx-brand__mark::before {
  content: "";
  width: 10px;
  height: 10px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.qx-brand__mark::after {
  content: "";
  position: absolute;
  right: -5px;
  bottom: -5px;
  width: 8px;
  height: 8px;
  background: var(--orange);
}

.qx-brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.15;
  min-width: 0;
}

.qx-brand__name {
  font-family: var(--font-narrow);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--cold-white);
}

.qx-brand__tag {
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--slate);
  white-space: nowrap;
}

.qx-header[data-condensed] .qx-brand__tag { display: none; }

/* 速度带 */
.qx-header__speedbar {
  position: relative;
  flex: 1 1 auto;
  min-width: 60px;
  height: 26px;
  overflow: hidden;
}

.qx-speedbar__ticks {
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, var(--grid-line) 0 1px, transparent 1px 14px);
  opacity: .9;
}

.qx-speedbar__line {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
  opacity: .4;
}

/* 导航 */
.qx-nav { flex: 0 0 auto; }

.qx-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.qx-nav__link {
  position: relative;
  display: inline-block;
  padding: 9px 12px;
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--slate);
  border-radius: var(--radius);
  transition: color .16s linear, background-color .16s linear;
}

.qx-nav__link:hover {
  color: var(--cold-white);
  background: rgba(34, 55, 94, .55);
}

.qx-nav__link[aria-current="page"] { color: var(--cyan); }

.qx-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background: var(--cyan);
}

.qx-nav__foot { display: none; }

.qx-nav__foot-note {
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--graphite);
  max-width: none;
}

/* 右侧动作区 */
.qx-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.qx-nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  color: var(--cold-white);
  cursor: pointer;
  transition: border-color .18s linear, color .18s linear;
}

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

.qx-nav-toggle__bar {
  position: absolute;
  left: 12px;
  right: 12px;
  height: 1.5px;
  background: currentColor;
  transition: transform .24s var(--ease), opacity .18s linear;
}

.qx-nav-toggle__bar:nth-child(1) { top: 15px; }
.qx-nav-toggle__bar:nth-child(2) { top: 21px; }
.qx-nav-toggle__bar:nth-child(3) { top: 27px; }

.qx-nav-toggle[data-open="true"] .qx-nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.qx-nav-toggle[data-open="true"] .qx-nav-toggle__bar:nth-child(2) { opacity: 0; }
.qx-nav-toggle[data-open="true"] .qx-nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

body.qx-nav-open { overflow: hidden; }

/* ---------- 8. 页脚 ---------- */
.qx-footer {
  background: var(--deck-blue);
  border-top: 1px solid var(--grid-line);
}

.qx-footer__band {
  position: relative;
  height: 18px;
  overflow: hidden;
  border-bottom: 1px solid var(--grid-line);
  background-image: repeating-linear-gradient(90deg, var(--grid-line) 0 1px, transparent 1px 12px);
}

.qx-footer__band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 122, 47, .35), transparent);
  transform: translateX(-100%);
  animation: qx-sweep 9s linear infinite;
}

.qx-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr 1.7fr;
  gap: 40px 32px;
  padding-block: 56px;
}

.qx-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 34ch;
}

.qx-footer__blurb {
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
  max-width: 32ch;
}

.qx-footer__label {
  display: block;
  margin-bottom: 16px;
  font-family: var(--font-narrow);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--graphite);
}

.qx-footer__links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.qx-footer__link {
  display: inline-block;
  font-size: 15px;
  color: var(--slate);
  transition: color .16s linear, transform .16s var(--ease);
}

.qx-footer__link:hover { color: var(--cyan); transform: translateX(3px); }

.qx-footer__contact {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.qx-footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.qx-footer__contact-key {
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--graphite);
}

.qx-footer__contact-val {
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--cold-white);
}

.qx-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 20px;
  border-top: 1px solid var(--grid-line);
  font-size: 13px;
  color: var(--graphite);
}

.qx-footer__bottom p { max-width: none; }

.qx-footer__closing { color: var(--slate); }

/* ---------- 9. 面包屑 ---------- */
.qx-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding-block: 18px;
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--graphite);
}

.qx-breadcrumb a { color: var(--slate); transition: color .16s linear; }
.qx-breadcrumb a:hover { color: var(--cyan); }
.qx-breadcrumb [aria-current="page"] { color: var(--cold-white); }
.qx-breadcrumb__sep { color: var(--grid-line); }

/* ---------- 10. 正文 ---------- */
.qx-prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.7;
  color: var(--cold-white);
}

.qx-prose > * + * { margin-top: 1.1em; }
.qx-prose h2 { margin-top: 2.2em; font-size: clamp(26px, 3vw, 36px); }
.qx-prose h3 { margin-top: 1.8em; }
.qx-prose ul { list-style: none; }

.qx-prose li {
  position: relative;
  padding-left: 22px;
  margin-bottom: .6em;
  color: var(--slate);
}

.qx-prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 10px;
  height: 1px;
  background: var(--cyan);
}

.qx-prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(53, 230, 210, .35);
}

.qx-prose a:hover { border-bottom-color: var(--cyan); }

.qx-prose blockquote {
  padding-left: 20px;
  border-left: 2px solid var(--cyan);
  color: var(--slate);
}

/* ---------- 11. 画板与卡片 ---------- */
.qx-panel {
  position: relative;
  padding: 32px;
  background: var(--deck-blue);
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
}

.qx-card {
  position: relative;
  padding: 24px;
  background: var(--panel-blue);
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  transition: border-color .2s linear, transform .2s var(--ease);
}

.qx-card:hover { border-color: var(--cyan); transform: translateY(-2px); }

.qx-card__title {
  font-family: var(--font-narrow);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -.01em;
  margin-bottom: 10px;
}

/* ---------- 12. 参数条 ---------- */
.qx-bar {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.qx-bar__track {
  position: relative;
  height: 6px;
  background: var(--panel-blue);
  border: 1px solid var(--grid-line);
  overflow: hidden;
}

.qx-bar__fill {
  display: block;
  width: 0;
  height: 100%;
  background: var(--cyan);
  transition: width .9s var(--ease);
}

.qx-bar__fill--orange { background: var(--orange); }

.qx-bar.is-inview .qx-bar__fill { width: var(--v, 0%); }

/* ---------- 13. 折叠面板 ---------- */
.qx-accordion { border-top: 1px solid var(--grid-line); }

.qx-accordion__item { border-bottom: 1px solid var(--grid-line); }

.qx-accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  padding: 20px 4px;
  text-align: left;
  font-family: var(--font-narrow);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--cold-white);
  cursor: pointer;
  transition: color .16s linear;
}

.qx-accordion__trigger:hover { color: var(--cyan); }

.qx-accordion__icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.qx-accordion__icon::before,
.qx-accordion__icon::after {
  content: "";
  position: absolute;
  background: currentColor;
  transition: transform .24s var(--ease), opacity .24s linear;
}

.qx-accordion__icon::before { left: 0; right: 0; top: 6px; height: 1.5px; }
.qx-accordion__icon::after { top: 0; bottom: 0; left: 6px; width: 1.5px; }

.qx-accordion__trigger[aria-expanded="true"] .qx-accordion__icon::after { transform: scaleY(0); opacity: 0; }

.qx-accordion__panel {
  height: 0;
  overflow: hidden;
  transition: height .3s var(--ease);
}

.qx-accordion__inner {
  padding: 0 4px 26px;
  max-width: 68ch;
  font-size: 16px;
  color: var(--slate);
}

/* ---------- 14. 章节目录 ---------- */
.qx-toc {
  position: sticky;
  top: calc(var(--hdr-h) + 24px);
  font-size: 13px;
}

.qx-toc__title {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-narrow);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--graphite);
}

.qx-toc__list {
  display: flex;
  flex-direction: column;
  border-left: 1px solid var(--grid-line);
}

.qx-toc__link {
  display: block;
  padding: 8px 14px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  color: var(--slate);
  transition: color .16s linear, border-color .16s linear, background-color .16s linear;
}

.qx-toc__link:hover { color: var(--cold-white); background: rgba(34, 55, 94, .45); }

.qx-toc__link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(53, 230, 210, .07);
}

/* ---------- 15. 图片容器 ---------- */
.qx-figure {
  position: relative;
  margin: 0;
  background: var(--panel-blue);
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.qx-figure__media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  background-color: var(--panel-blue);
  background-image:
    linear-gradient(135deg, rgba(53, 230, 210, .07), transparent 62%),
    repeating-linear-gradient(90deg, rgba(34, 55, 94, .55) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(0deg, rgba(34, 55, 94, .55) 0 1px, transparent 1px 48px);
}

.qx-figure__media--wide { aspect-ratio: 21 / 9; }
.qx-figure__media--square { aspect-ratio: 1 / 1; }
.qx-figure__media--tall { aspect-ratio: 3 / 4; }

.qx-figure__media img,
.qx-figure__media svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.qx-figure__caption {
  padding: 12px 16px;
  font-size: 13px;
  color: var(--slate);
  border-top: 1px solid var(--grid-line);
}

/* ---------- 16. 筛选按钮 ---------- */
.qx-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.qx-filter__btn {
  min-height: 36px;
  padding: 0 14px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--slate);
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  cursor: pointer;
  transition: color .16s linear, border-color .16s linear, background-color .16s linear;
}

.qx-filter__btn:hover { color: var(--cold-white); border-color: var(--cyan); }

.qx-filter__btn[aria-pressed="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04121A;
}

/* ---------- 17. 进度条与返回顶部 ---------- */
.qx-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 130;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  pointer-events: none;
}

.qx-totop {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  color: var(--cyan);
  background: var(--panel-blue);
  border: 1px solid var(--grid-line);
  border-radius: var(--radius);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity .24s var(--ease), transform .24s var(--ease),
    visibility .24s linear, border-color .18s linear;
}

.qx-totop[data-visible="true"] { opacity: 1; visibility: visible; transform: none; }
.qx-totop:hover { border-color: var(--cyan); }

.qx-totop__icon {
  display: block;
  width: 10px;
  height: 10px;
  margin-top: 4px;
  border-left: 1.5px solid currentColor;
  border-top: 1.5px solid currentColor;
  transform: rotate(45deg);
}

/* ---------- 18. 显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}

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

/* ---------- 19. 焦点可见 ---------- */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 1px;
}

.qx-skip:focus-visible { outline-color: var(--cold-white); }

/* ---------- 20. 响应式 ---------- */
@media (max-width: 1180px) {
  .qx-header__speedbar { display: none; }
}

@media (max-width: 1024px) {
  .qx-header__cta { display: none; }
  .qx-footer__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .qx-footer__brand { grid-column: 1 / -1; }
  .qx-footer__col--contact { grid-column: 1 / -1; }
}

@media (max-width: 960px) {
  :root { --gutter: 20px; }
  .qx-nav__link { padding: 9px 9px; font-size: 14px; }
  .qx-nav__link[aria-current="page"]::after { left: 9px; right: 9px; }
}

@media (max-width: 900px) {
  .qx-grid { grid-template-columns: 1fr; gap: 24px; }
  .qx-col-4, .qx-col-5, .qx-col-6, .qx-col-7, .qx-col-8, .qx-col-12 { grid-column: 1 / -1; }
  .qx-toc { position: static; top: auto; }
}

@media (max-width: 880px) {
  :root { --hdr-h: 66px; --hdr-h-condensed: 54px; }

  .qx-nav-toggle { display: block; }

  .qx-nav {
    position: fixed;
    top: var(--hdr-h);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 110;
    padding: 24px var(--gutter) 48px;
    overflow-y: auto;
    background: var(--void-navy);
    border-top: 1px solid var(--grid-line);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    pointer-events: none;
    transition: opacity .24s var(--ease), transform .24s var(--ease),
      visibility .24s linear;
  }

  .qx-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }

  .qx-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .qx-nav__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 8px;
    font-family: var(--font-narrow);
    font-size: 20px;
    font-weight: 700;
    letter-spacing: .02em;
    color: var(--cold-white);
    border-radius: 0;
    border-bottom: 1px solid var(--grid-line);
    background: none;
  }

  .qx-nav__link:hover { background: rgba(34, 55, 94, .4); }

  .qx-nav__link[aria-current="page"] {
    color: var(--cyan);
    padding-left: 16px;
  }

  .qx-nav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 3px;
    height: 22px;
    margin-top: -11px;
    background: var(--cyan);
  }

  .qx-nav__link[aria-current="page"]::after { display: none; }

  .qx-nav__foot {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 28px;
    padding-top: 24px;
    border-top: 1px solid var(--grid-line);
  }

  .qx-brand__tag { display: none; }
  .qx-panel { padding: 24px; }
  .qx-footer__grid { padding-block: 40px; }
  .qx-totop { right: 16px; bottom: 16px; }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .qx-footer__grid { grid-template-columns: 1fr; gap: 32px; }
  .qx-footer__bottom { flex-direction: column; }
  .qx-panel { padding: 20px; }
  .qx-card { padding: 20px; }
  .qx-accordion__trigger { font-size: 16.5px; }
}

/* ---------- 21. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  [data-reveal] { opacity: 1; transform: none; }
  .qx-band::after, .qx-footer__band::after { transform: none; opacity: .2; }
}