/* ============ 1. 变量与重置 ============ */
:root {
  --site-bg: #0A0E17;
  --card-bg: #1A1E2A;
  --glass-bg: rgba(255, 255, 255, 0.06);
  --glass-border: rgba(255, 255, 255, 0.12);
  --cyan: #00E5FF;
  --green: #39FF14;
  --orange: #FF4D00;
  --purple: #9D4EDD;
  --white: #FFFFFF;
  --text-2: #A0AABA;
  --grid-line: rgba(0, 229, 255, 0.15);
  --font-t: "Barlow Condensed", Impact, "Arial Narrow", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-b: Inter, system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-m: "SF Mono", "Cascadia Mono", Consolas, "Roboto Mono", "Liberation Mono", monospace;
  --container: 1280px;
  --radius: 3px;
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  background-color: var(--site-bg);
  scroll-behavior: smooth;
  scroll-padding-top: 20px;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  font-family: var(--font-b);
  font-size: 16px;
  line-height: 1.6;
  color: var(--white);
  background-color: var(--site-bg);
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6, p {
  margin: 0;
}

ul,
ol {
  list-style: none;
}

a {
  color: var(--cyan);
  text-decoration: none;
  text-decoration-skip-ink: auto;
}

a:hover {
  color: var(--white);
}

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

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

[hidden] {
  display: none !important;
}

#main-content {
  position: relative;
  min-height: 60vh;
  outline: none;
}

::selection {
  background: var(--cyan);
  color: var(--site-bg);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: #060A12;
}

::-webkit-scrollbar-thumb {
  background: var(--card-bg);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--cyan);
}

/* ============ 2. 可访问性 ============ */
:focus-visible {
  outline: 3px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 5000;
  padding: 10px 18px;
  background: var(--orange);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 14px;
  border-radius: 2px;
  text-decoration: none;
  transform: translateY(-250%);
  opacity: 0;
}

.skip-link:focus {
  transform: none;
  opacity: 1;
  color: #FFFFFF;
}

/* ============ 3. 容器与网格 ============ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

.grid {
  display: grid;
  gap: 24px;
}

.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));
}

/* ============ 4. 头部 ============ */
.site-header {
  position: relative;
  z-index: 100;
  background: rgba(10, 14, 23, 0.88);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--grid-line);
}

.header-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 3000;
  pointer-events: none;
}

.header-progress span {
  display: block;
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--cyan), var(--green));
  box-shadow: 0 0 10px rgba(0, 229, 255, 0.5);
}

.header-topbar {
  position: relative;
  background: rgba(0, 0, 0, 0.22);
  border-bottom: 1px solid var(--grid-line);
}

.header-topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 34px;
  font-family: var(--font-m);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--text-2);
}

.header-live {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  text-transform: uppercase;
}

.live-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
  animation: pulse 1.6s ease-in-out infinite;
}

.header-search {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 3px 10px;
  border: 1px solid var(--grid-line);
  color: var(--text-2);
  font-family: var(--font-m);
  font-size: 11px;
  letter-spacing: 0.1em;
  line-height: 1.6;
  transition: color var(--transition), border-color var(--transition), background-color var(--transition);
}

.header-search::after {
  content: "";
  width: 5px;
  height: 5px;
  border-top: 1px solid currentColor;
  border-right: 1px solid currentColor;
  transform: rotate(45deg);
}

.header-search:hover {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(0, 229, 255, 0.06);
}

.header-masthead {
  position: relative;
  text-align: center;
  padding: 24px 16px 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 28px;
  color: var(--white);
}

.brand:hover {
  color: var(--white);
}

.brand__side {
  min-width: 76px;
  font-family: var(--font-m);
  font-size: 10px;
  line-height: 1.7;
  letter-spacing: 0.14em;
  color: var(--text-2);
  text-align: left;
  border-left: 1px solid var(--grid-line);
  padding-left: 12px;
}

.brand__side--right {
  text-align: right;
  border-left: 0;
  border-right: 1px solid var(--grid-line);
  padding-left: 0;
  padding-right: 12px;
}

.brand__core {
  display: inline-block;
  text-align: center;
}

.brand__name {
  display: block;
  font-family: var(--font-t);
  font-size: 56px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.05em;
  color: var(--white);
}

.brand__eng {
  display: block;
  margin-top: 8px;
  font-family: var(--font-m);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.5em;
  text-transform: uppercase;
  color: var(--cyan);
  text-indent: 0.5em;
}

.header-navbar {
  position: relative;
  border-top: 1px solid var(--grid-line);
}

.header-navbar__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
}

.site-nav {
  width: 100%;
}

.nav-list {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
}

.nav-list__item + .nav-list__item {
  margin-left: 4px;
}

.nav-list__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 15px 16px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--text-2);
  transition: color var(--transition);
}

.nav-list__link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 10px;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--green));
  transform: skewX(-24deg);
  transform-origin: left bottom;
  opacity: 0;
  transition: opacity var(--transition);
}

.nav-list__link:hover {
  color: var(--white);
}

.nav-list__link:hover::after,
.nav-list__link[aria-current="page"]::after {
  opacity: 1;
}

.nav-list__link[aria-current="page"] {
  color: var(--white);
}

.nav-list__index {
  font-family: var(--font-m);
  font-size: 10px;
  line-height: 1.8;
  letter-spacing: 0.08em;
  color: var(--cyan);
  opacity: 0.55;
  transition: opacity var(--transition), color var(--transition);
}

.nav-list__link:hover .nav-list__index,
.nav-list__link[aria-current="page"] .nav-list__index {
  opacity: 1;
  color: var(--green);
}

.nav-list__text {
  display: inline-block;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: transparent;
  border: 1px solid var(--grid-line);
  color: var(--white);
  font-family: var(--font-m);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  line-height: 1;
  transition: border-color var(--transition), color var(--transition);
}

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

.nav-toggle__icon {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.nav-toggle__icon span {
  position: absolute;
  left: 0;
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform var(--transition), top var(--transition), opacity var(--transition);
}

.nav-toggle__icon span:nth-child(1) {
  top: 0;
}

.nav-toggle__icon span:nth-child(2) {
  top: 5px;
}

.nav-toggle__icon span:nth-child(3) {
  top: 10px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(1) {
  top: 5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__icon span:nth-child(3) {
  top: 5px;
  transform: rotate(-45deg);
}

.nav-toggle__label {
  pointer-events: none;
}

/* ============ 5. 页脚 ============ */
.site-footer {
  position: relative;
  overflow: hidden;
  background: #060A12;
  border-top: 1px solid var(--grid-line);
  color: var(--text-2);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to right, rgba(0, 229, 255, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 229, 255, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.site-footer::after {
  content: "LEJING";
  position: absolute;
  right: -10px;
  bottom: -18px;
  z-index: 0;
  font-family: var(--font-t);
  font-size: 140px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.025);
  pointer-events: none;
  white-space: nowrap;
}

.footer-top {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(220px, 300px) 1fr;
  gap: 48px;
  align-items: center;
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--grid-line);
}

.footer-brand {
  display: inline-block;
  color: var(--white);
}

.footer-brand:hover {
  color: var(--white);
}

.footer-brand__name {
  display: block;
  font-family: var(--font-t);
  font-size: 48px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--white);
}

.footer-brand__eng {
  display: block;
  margin-top: 10px;
  font-family: var(--font-m);
  font-size: 11px;
  letter-spacing: 0.5em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-trust {
  max-width: 720px;
  padding-inline-start: 18px;
  border-inline-start: 2px solid var(--cyan);
  color: var(--text-2);
  font-size: 15px;
  line-height: 1.75;
}

.footer-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  padding: 40px 0;
}

.footer-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-t);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--white);
}

.footer-col__title::before {
  content: "//";
  font-family: var(--font-m);
  font-size: 12px;
  font-weight: 400;
  color: var(--cyan);
}

.footer-col__list li {
  margin-top: 10px;
  color: var(--text-2);
  font-size: 14px;
}

.footer-col__list li:first-child {
  margin-top: 0;
}

.footer-col__list a {
  color: var(--text-2);
  transition: color var(--transition);
}

.footer-col__list a:hover {
  color: var(--cyan);
}

.footer-bottom {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding: 22px 0 28px;
  border-top: 1px solid var(--grid-line);
  font-family: var(--font-m);
  font-size: 12px;
  letter-spacing: 0.05em;
}

.footer-copyright {
  color: var(--text-2);
}

.footer-legal {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-legal a {
  color: var(--text-2);
  font-size: 12px;
  transition: color var(--transition);
}

.footer-legal a:hover {
  color: var(--cyan);
}

.footer-icp {
  color: var(--text-2);
}

/* ============ 6. 页面结构与面包屑 ============ */
.content {
  position: relative;
  padding: 48px 0 96px;
}

.page-head {
  position: relative;
  padding: 56px 0 28px;
  border-bottom: 1px solid var(--grid-line);
  margin-bottom: 48px;
}

.page-head::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 84px;
  height: 4px;
  background: linear-gradient(90deg, var(--cyan), var(--green));
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

.page-head__title {
  font-family: var(--font-t);
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--white);
  text-transform: uppercase;
  display: inline-block;
  transform: skewX(-4deg);
  transform-origin: left bottom;
}

.page-head__desc {
  max-width: 680px;
  margin-top: 12px;
  color: var(--text-2);
  font-size: 17px;
  line-height: 1.7;
}

.section {
  position: relative;
  padding: 40px 0;
}

.section--tight {
  padding: 24px 0;
}

.section__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--grid-line);
}

.section__title {
  font-family: var(--font-t);
  font-size: 32px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--white);
  display: inline-block;
}

.section__title::before {
  content: "//";
  font-family: var(--font-m);
  font-size: 0.4em;
  font-weight: 400;
  color: var(--cyan);
  margin-right: 10px;
}

.section__index {
  font-family: var(--font-m);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--cyan);
  white-space: nowrap;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-family: var(--font-m);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-2);
}

.breadcrumb a {
  color: var(--text-2);
  transition: color var(--transition);
}

.breadcrumb a:hover {
  color: var(--cyan);
}

.breadcrumb__sep {
  color: var(--cyan);
  opacity: 0.5;
  font-size: 10px;
}

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

/* ============ 7. 通用组件 ============ */
.btn {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 32px;
  background: transparent;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--white);
  cursor: pointer;
  text-transform: uppercase;
  text-decoration: none;
  transition: color var(--transition), filter var(--transition);
}

.btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  transform: skewX(-10deg);
  border-radius: 2px;
  transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.btn--primary {
  color: #FFFFFF;
}

.btn--primary::before {
  background: var(--orange);
}

.btn--primary:hover::before,
.btn--primary:focus-visible::before {
  background: #FF6A1A;
  box-shadow: 0 0 28px rgba(255, 77, 0, 0.45);
}

.btn--ghost {
  color: var(--cyan);
}

.btn--ghost::before {
  background: transparent;
  border: 1px solid var(--cyan);
}

.btn--ghost:hover::before,
.btn--ghost:focus-visible::before {
  background: rgba(0, 229, 255, 0.08);
  box-shadow: 0 0 22px rgba(0, 229, 255, 0.25);
}

.btn--sm {
  padding: 8px 18px;
  font-size: 13px;
}

.card {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  padding: 28px;
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.card:hover {
  border-color: rgba(0, 229, 255, 0.45);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.card--solid {
  background: var(--card-bg);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--grid-line);
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.02);
  font-family: var(--font-m);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-2);
  line-height: 1.6;
}

.tag::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: currentColor;
}

.tag--live {
  color: var(--green);
  border-color: rgba(57, 255, 20, 0.35);
  background: rgba(57, 255, 20, 0.06);
}

.tag--live::before {
  animation: pulse 1.4s ease-in-out infinite;
}

.tag--hl {
  color: var(--cyan);
  border-color: rgba(0, 229, 255, 0.35);
  background: rgba(0, 229, 255, 0.06);
}

.tag--warn {
  color: var(--orange);
  border-color: rgba(255, 77, 0, 0.4);
  background: rgba(255, 77, 0, 0.06);
}

.tag--alt {
  color: var(--purple);
  border-color: rgba(157, 78, 221, 0.4);
  background: rgba(157, 78, 221, 0.08);
}

.data-num {
  display: inline-block;
  font-family: var(--font-m);
  font-size: 56px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.data-num--green {
  color: var(--green);
}

.data-num--lg {
  font-size: 96px;
}

.data-num--xl {
  font-size: 120px;
}

.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background-color: var(--card-bg);
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 24px 24px;
  border: 1px solid var(--grid-line);
}

.img-frame--wide {
  aspect-ratio: 16 / 9;
}

.img-frame--portrait {
  aspect-ratio: 3 / 4;
}

.img-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-frame__index {
  position: absolute;
  right: 10px;
  bottom: 8px;
  z-index: 2;
  padding: 2px 6px;
  background: rgba(10, 14, 23, 0.7);
  font-family: var(--font-m);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  opacity: 0.85;
}

.divider {
  position: relative;
  height: 2px;
  border: 0;
  margin: 32px 0;
  background: linear-gradient(90deg, var(--cyan) 0%, rgba(0, 229, 255, 0.1) 40%, rgba(57, 255, 20, 0.1) 60%, var(--green) 100%);
}

.divider::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 50%;
  width: 10px;
  height: 10px;
  background: var(--purple);
  transform: rotate(45deg);
}

.coord-label {
  display: inline-block;
  font-family: var(--font-m);
  font-size: 11px;
  letter-spacing: 0.18em;
  line-height: 1.7;
  text-transform: uppercase;
  color: var(--cyan);
  border-inline-start: 2px solid var(--cyan);
  padding-inline-start: 10px;
}

.speedline {
  position: relative;
  overflow: hidden;
}

.speedline::after {
  content: "";
  position: absolute;
  top: 0;
  right: -30%;
  width: 45%;
  height: 100%;
  background: linear-gradient(105deg, transparent 0%, rgba(0, 229, 255, 0.07) 45%, rgba(57, 255, 20, 0.05) 60%, transparent 100%);
  transform: skewX(-18deg);
  pointer-events: none;
}

.heading--skew {
  display: inline-block;
  transform: skewX(-6deg);
  transform-origin: left bottom;
}

/* ============ 8. 标签页 ============ */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--grid-line);
  padding-bottom: 12px;
  margin-bottom: 28px;
}

.tabs__btn {
  position: relative;
  z-index: 1;
  padding: 10px 22px;
  background: transparent;
  border: 0;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-2);
  transition: color var(--transition);
}

.tabs__btn::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border: 1px solid var(--grid-line);
  background: rgba(255, 255, 255, 0.02);
  transform: skewX(-8deg);
  transition: background-color var(--transition), border-color var(--transition);
}

.tabs__btn:hover {
  color: var(--white);
}

.tabs__btn:hover::before {
  border-color: rgba(0, 229, 255, 0.45);
  background: rgba(0, 229, 255, 0.06);
}

.tabs__btn[aria-selected="true"] {
  color: var(--site-bg);
  font-weight: 700;
}

.tabs__btn[aria-selected="true"]::before {
  background: var(--cyan);
  border-color: var(--cyan);
}

.tabs__panel {
  position: relative;
  padding: 8px 0 16px;
}

.tabs__panel[hidden] {
  display: none;
}

/* ============ 9. 滚动显现 ============ */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ============ 10. 动画 ============ */
@keyframes pulse {
  0%, 100% {
    opacity: 1;
    box-shadow: 0 0 6px var(--green);
  }
  50% {
    opacity: 0.4;
    box-shadow: 0 0 14px var(--green);
  }
}

/* ============ 11. 响应式 ============ */
@media (max-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex;
  }

  .header-navbar__inner {
    justify-content: flex-start;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(8, 12, 20, 0.98);
    border-bottom: 1px solid var(--grid-line);
    box-shadow: 0 24px 40px rgba(0, 0, 0, 0.45);
    z-index: 300;
    visibility: hidden;
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  }

  .site-nav[data-open] {
    visibility: visible;
    opacity: 1;
    transform: none;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 6px 0 10px;
  }

  .nav-list__item + .nav-list__item {
    margin-left: 0;
    border-top: 1px solid rgba(0, 229, 255, 0.08);
  }

  .nav-list__link {
    width: 100%;
    justify-content: flex-start;
    padding: 14px 20px;
  }

  .nav-list__link::after {
    display: none;
  }

  .brand__side {
    display: none;
  }

  .header-masthead {
    padding: 18px 16px 10px;
  }

  .brand__name {
    font-size: 44px;
  }

  .brand__eng {
    font-size: 10px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 44px 0 32px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    padding: 32px 0;
  }
}

@media (max-width: 600px) {
  .header-topbar__inner {
    font-size: 10px;
  }

  .header-masthead {
    padding: 14px 12px 8px;
  }

  .brand__name {
    font-size: 32px;
  }

  .brand__eng {
    font-size: 9px;
    letter-spacing: 0.4em;
    text-indent: 0.4em;
  }

  .nav-list__link {
    font-size: 14px;
    padding: 13px 16px;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 0 24px;
  }

  .site-footer::after {
    display: none;
  }

  .data-num {
    font-size: 40px;
  }

  .data-num--lg {
    font-size: 64px;
  }

  .data-num--xl {
    font-size: 72px;
  }

  .page-head {
    padding: 40px 0 22px;
    margin-bottom: 32px;
  }

  .page-head__title {
    font-size: 34px;
  }

  .btn {
    padding: 11px 24px;
    font-size: 14px;
  }
}

/* ============ 12. 减弱动效 ============ */
@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;
  }

  .live-dot,
  .tag--live::before {
    animation: none;
  }

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