/* ============================================================
   NG赛场 / NG PULSE — 全站共享样式
   深空黑底 · 荧光绿数据 · 金属银边界 · 热力橙红状态
   ============================================================ */

/* ---------- Reset 与变量 ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-deep: #0B0F14;
  --bg-card: #131A23;
  --neon: #00FF9D;
  --silver: #C8CFD8;
  --orange: #FF4D00;
  --white: #F2F5F8;
  --gray-blue: #9AA7B4;
  --cyan: #00D4FF;

  --font-head: "Arial Black", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Sans Pro", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SF Mono", "Cascadia Mono", Consolas, monospace;

  --container: 1240px;
  --container-narrow: 880px;
  --gap: 1rem;
  --radius: 6px;
  --ease: .25s cubic-bezier(.4, 0, .2, 1);
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-deep);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  display: block;
}

#main-content:focus {
  outline: none;
}

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

ul, ol {
  list-style: none;
}

a {
  color: var(--neon);
  text-decoration: none;
  transition: color .2s;
}

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

button {
  font-family: inherit;
  font-size: inherit;
}

::selection {
  background: var(--neon);
  color: #000;
}

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

::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-deep);
}
::-webkit-scrollbar-thumb {
  background: #223040;
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--neon);
}

body.nav-lock {
  overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .site-nav[data-open] .nav-link {
    animation: none;
  }
}

/* ---------- 标题与正文排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--white);
}

h1 {
  font-size: clamp(2rem, 4vw + .5rem, 3.2rem);
}

h2 {
  font-size: clamp(1.5rem, 2.5vw + .5rem, 2.2rem);
}

h3 {
  font-size: 1.2rem;
}

h4 {
  font-size: 1rem;
}

p {
  margin-block-end: 1rem;
}

.mono,
.data-num,
.data-key,
code {
  font-family: var(--font-mono);
}

/* ---------- 宽度容器 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.container-narrow {
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.section {
  padding-block: 3.5rem;
}

/* ---------- 章节标签 ---------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-block-end: .8rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--neon);
}

.section-label::before {
  content: "";
  flex: 0 0 auto;
  width: 9px;
  height: 9px;
  background: var(--orange);
  transform: skewX(-12deg);
}

.section-kicker {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gray-blue);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  padding: .65rem 1.3rem;
  font-family: var(--font-body);
  font-size: .82rem;
  font-weight: 700;
  letter-spacing: .08em;
  border: 1px solid var(--silver);
  background: transparent;
  color: var(--silver);
  cursor: pointer;
  transition: all var(--ease);
}

.btn:hover {
  border-color: var(--neon);
  color: var(--neon);
  box-shadow: 0 0 18px rgba(0, 255, 157, .12);
}

.btn-primary {
  background: var(--neon);
  border-color: var(--neon);
  color: #001209;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.btn-primary:hover {
  background: var(--white);
  border-color: var(--white);
  color: #000;
  box-shadow: 0 0 26px rgba(0, 255, 157, .3);
}

.btn-ghost {
  border-color: rgba(200, 207, 216, .4);
  color: var(--white);
}

.btn-ghost:hover {
  border-color: var(--orange);
  color: var(--orange);
  box-shadow: 0 0 18px rgba(255, 77, 0, .15);
}

.btn-sm {
  padding: .4rem .9rem;
  font-size: .72rem;
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .18rem .6rem;
  font-family: var(--font-body);
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--silver);
  border: 1px solid rgba(200, 207, 216, .35);
  border-radius: 999px;
}

.tag-hot {
  color: var(--orange);
  border-color: rgba(255, 77, 0, .5);
  background: rgba(255, 77, 0, .08);
}

.tag-live {
  color: var(--neon);
  border-color: rgba(0, 255, 157, .5);
  background: rgba(0, 255, 157, .08);
}

.tag-live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon);
  animation: live-pulse 1.6s infinite;
}

@keyframes live-pulse {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(0, 255, 157, .6);
  }
  50% {
    box-shadow: 0 0 0 5px rgba(0, 255, 157, 0);
  }
}

/* ---------- Bento 卡片 ---------- */
.card {
  position: relative;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid rgba(200, 207, 216, .12);
  border-radius: var(--radius);
  transition: border-color var(--ease), box-shadow var(--ease), transform var(--ease);
}

.card:hover {
  border-color: var(--neon);
  box-shadow: 0 0 0 1px rgba(0, 255, 157, .25), 0 8px 30px rgba(0, 0, 0, .4);
  transform: translateY(-2px);
}

.card-topline::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--neon), var(--cyan));
}

.card-title {
  margin-block-end: .6rem;
  font-size: 1.05rem;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--gray-blue);
}

.card-desc {
  font-size: .9rem;
  color: var(--gray-blue);
}

/* ---------- 数据强调 ---------- */
.data-num {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.1;
  color: var(--neon);
  font-variant-numeric: tabular-nums;
}

.data-num small {
  margin-inline-start: .15em;
  font-size: .6em;
  color: var(--gray-blue);
}

.data-key {
  display: inline-block;
  padding: .15em .5em;
  font-size: .8em;
  font-style: normal;
  font-weight: 700;
  color: var(--neon);
  background: rgba(0, 255, 157, .08);
  border-left: 2px solid var(--neon);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  padding-block: .8rem;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .4rem;
}

.breadcrumb-item {
  font-family: var(--font-mono);
  font-size: .75rem;
  color: var(--gray-blue);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin-inline: .3rem;
  color: rgba(200, 207, 216, .3);
}

.breadcrumb-link {
  color: var(--silver);
}

.breadcrumb-link:hover {
  color: var(--neon);
}

.breadcrumb-current {
  color: var(--neon);
}

/* ---------- 内页首部 ---------- */
.page-head {
  position: relative;
  padding-block: 3rem 2rem;
  margin-block-end: 2.5rem;
  border-bottom: 1px solid rgba(200, 207, 216, .12);
}

.page-head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 120px;
  height: 3px;
  background: linear-gradient(90deg, var(--neon), var(--orange));
}

.page-title {
  margin-block-end: .6rem;
  font-size: clamp(2rem, 4vw + .5rem, 3rem);
  line-height: 1.15;
}

.page-desc {
  max-width: 60ch;
  color: var(--gray-blue);
}

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: var(--gap);
}

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

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

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

.grid-12 {
  grid-template-columns: repeat(12, 1fr);
}

/* ---------- 图片占位容器 ---------- */
.img-holder {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(200, 207, 216, .14);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--bg-card) 25%, var(--bg-deep) 25%, var(--bg-deep) 50%, var(--bg-card) 50%, var(--bg-card) 75%, var(--bg-deep) 75%);
  background-size: 14px 14px;
}

.img-holder::before {
  content: "";
  display: block;
  padding-top: 56.25%;
}

.img-holder[data-ratio="4:3"]::before {
  padding-top: 75%;
}

.img-holder[data-ratio="1:1"]::before {
  padding-top: 100%;
}

.img-holder[data-ratio="3:2"]::before {
  padding-top: 66.66%;
}

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

.img-holder::after {
  content: "IMG / NG-PULSE";
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .3em;
  color: rgba(200, 207, 216, .35);
  pointer-events: none;
}

.fig-cap {
  margin-top: .5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--gray-blue);
}

/* ---------- 数据表格 ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .875rem;
}

.data-table th {
  padding: .6rem .75rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  text-align: left;
  color: var(--gray-blue);
  border-bottom: 1px solid rgba(200, 207, 216, .2);
}

.data-table td {
  padding: .6rem .75rem;
  color: var(--white);
  border-bottom: 1px solid rgba(200, 207, 216, .08);
  font-variant-numeric: tabular-nums;
}

.data-table tbody tr:hover {
  background: rgba(0, 255, 157, .04);
}

.data-table .num {
  font-family: var(--font-mono);
  color: var(--neon);
}

/* ---------- 其他通用组件 ---------- */
.accent-line {
  height: 2px;
  margin: 2rem 0;
  border: 0;
  background: linear-gradient(90deg, var(--neon), var(--cyan), transparent);
}

.callout {
  margin-block: 1.5rem;
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  border-left: 3px solid var(--orange);
  font-size: .92rem;
  color: var(--silver);
}

.content-link {
  border-bottom: 1px solid rgba(0, 255, 157, .3);
}

.content-link:hover {
  border-bottom-color: var(--white);
}

/* ============================================================
   页头
   ============================================================ */
.skip-link {
  position: fixed;
  top: .75rem;
  left: .75rem;
  z-index: 300;
  padding: .5rem 1rem;
  background: var(--neon);
  color: #000;
  font-family: var(--font-mono);
  font-size: .85rem;
  font-weight: 700;
  border-radius: 4px;
  transform: translateY(-300%);
  transition: transform .2s;
}

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

.progress-track {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 250;
  height: 3px;
  background: rgba(200, 207, 216, .08);
  pointer-events: none;
}

.progress-inner {
  width: 0%;
  height: 100%;
  background: linear-gradient(90deg, var(--neon), var(--cyan) 60%, var(--orange));
  transition: width .08s linear;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 150;
  border-bottom: 1px solid rgba(200, 207, 216, .14);
  transition: box-shadow .3s;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(11, 15, 20, .92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header[data-scrolled] {
  box-shadow: 0 6px 24px rgba(0, 0, 0, .5);
}

.site-header[data-scrolled] .masthead {
  padding-block: .35rem;
}

.site-header[data-scrolled] .brand-cn {
  font-size: 1.1rem;
}

.site-header[data-scrolled] .brand-en {
  display: none;
}

.masthead {
  position: relative;
  z-index: 160;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
  max-width: var(--container);
  min-height: 72px;
  margin-inline: auto;
  padding: .85rem 1.25rem;
  transition: padding var(--ease);
}

.menu-btn {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  justify-self: start;
  padding: .45rem .8rem;
  background: transparent;
  border: 1px solid rgba(200, 207, 216, .3);
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  cursor: pointer;
  transition: all var(--ease);
}

.menu-btn:hover {
  border-color: var(--neon);
  color: var(--neon);
}

.menu-icon {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.menu-icon i {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform .25s;
}

.menu-icon i:nth-child(2) {
  width: 12px;
}

.menu-btn[data-open] .menu-icon i:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.menu-btn[data-open] .menu-icon i:nth-child(2) {
  opacity: 0;
}

.menu-btn[data-open] .menu-icon i:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

.brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-self: center;
  gap: .1rem;
  line-height: 1;
  text-align: center;
}

.brand-cn {
  font-family: var(--font-head);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: .06em;
  color: var(--white);
  transition: font-size var(--ease);
}

.brand-accent {
  color: var(--neon);
}

.brand-en {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .4em;
  text-transform: uppercase;
  color: var(--gray-blue);
}

.login-btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  justify-self: end;
  padding: .5rem 1rem;
  background: rgba(0, 255, 157, .05);
  border: 1px solid var(--neon);
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--white);
  transition: all var(--ease);
}

.login-btn:hover {
  background: var(--neon);
  color: #001209;
  box-shadow: 0 0 20px rgba(0, 255, 157, .35);
}

.login-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 8px var(--neon);
  animation: live-pulse 1.6s infinite;
}

.site-nav {
  display: flex;
  align-items: stretch;
  justify-content: center;
  background: rgba(19, 26, 35, .6);
  border-top: 1px solid rgba(200, 207, 216, .1);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .65rem 1.1rem .7rem;
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--silver);
  transition: color .2s, background .2s;
}

.nav-link:hover {
  background: rgba(0, 255, 157, .06);
  color: var(--white);
}

.nav-num {
  font-family: var(--font-mono);
  font-size: .62rem;
  letter-spacing: .1em;
  color: var(--gray-blue);
  transition: color .2s;
}

.nav-link:hover .nav-num,
.nav-link[aria-current="page"] .nav-num {
  color: var(--neon);
}

.nav-name {
  position: relative;
  z-index: 1;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--neon);
  transition: width .25s ease, left .25s ease;
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  left: 0;
  width: 100%;
}

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

/* ---------- 桌面端全屏目录 ---------- */
@keyframes menu-rise {
  from {
    opacity: 0;
    transform: translateY(16px) skewX(-6deg);
  }
  to {
    opacity: 1;
    transform: skewX(-6deg);
  }
}

@media (min-width: 992px) {
  .site-nav[data-open] {
    position: fixed;
    inset: 0;
    z-index: 145;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: .35rem;
    padding-top: 90px;
    padding-bottom: 70px;
    overflow-y: auto;
    background: rgba(11, 15, 20, .98);
    border-top: 1px solid rgba(0, 255, 157, .3);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
  }

  .site-nav[data-open]::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
      linear-gradient(rgba(200, 207, 216, .045) 1px, transparent 1px) 0 0 / 100% 48px,
      linear-gradient(90deg, rgba(200, 207, 216, .045) 1px, transparent 1px) 0 0 / 48px 100%;
    pointer-events: none;
  }

  .site-nav[data-open]::after {
    content: "NG";
    position: absolute;
    right: 6%;
    bottom: -4%;
    font-family: var(--font-head);
    font-size: 18rem;
    font-weight: 900;
    line-height: 1;
    color: rgba(0, 255, 157, .04);
    transform: skewX(-8deg);
    pointer-events: none;
  }

  .site-nav[data-open] .nav-link {
    padding: .5rem 2rem;
    transform: skewX(-6deg);
    font-size: clamp(1.4rem, 3.2vw, 2.2rem);
    letter-spacing: .06em;
    color: var(--white);
    animation: menu-rise .35s both;
  }

  .site-nav[data-open] .nav-link:nth-child(2) {
    animation-delay: .05s;
  }

  .site-nav[data-open] .nav-link:nth-child(3) {
    animation-delay: .1s;
  }

  .site-nav[data-open] .nav-link:nth-child(4) {
    animation-delay: .15s;
  }

  .site-nav[data-open] .nav-link:nth-child(5) {
    animation-delay: .2s;
  }

  .site-nav[data-open] .nav-link:nth-child(6) {
    animation-delay: .25s;
  }

  .site-nav[data-open] .nav-link::before {
    content: "";
    flex: 0 0 auto;
    width: 26px;
    height: 2px;
    background: var(--orange);
    transform: skewX(-20deg);
  }

  .site-nav[data-open] .nav-link::after {
    display: none;
  }

  .site-nav[data-open] .nav-link:hover {
    background: transparent;
    color: var(--neon);
    text-shadow: 0 0 22px rgba(0, 255, 157, .45);
  }

  .site-nav[data-open] .nav-num {
    font-size: .75rem;
    color: var(--gray-blue);
  }
}

/* ---------- 返回顶部 ---------- */
.back-top {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  background: var(--bg-card);
  border: 1px solid rgba(0, 255, 157, .4);
  color: var(--neon);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--ease);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.back-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-top:hover {
  background: var(--neon);
  color: #000;
  box-shadow: 0 0 22px rgba(0, 255, 157, .4);
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: 4rem;
  background: var(--bg-card);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--neon), var(--cyan) 40%, var(--orange));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 2.5rem;
  padding-block: 3rem 2.5rem;
}

.footer-brand {
  display: inline-block;
  margin-block-end: .6rem;
}

.footer-brand-cn {
  font-family: var(--font-head);
  font-size: 1.4rem;
  font-weight: 900;
  letter-spacing: .08em;
  color: var(--white);
}

.footer-brand-en {
  margin-inline-start: .5rem;
  font-family: var(--font-mono);
  font-size: .65rem;
  letter-spacing: .2em;
  color: var(--gray-blue);
}

.footer-desc {
  max-width: 45ch;
  margin-block-end: .8rem;
  font-size: .88rem;
  color: var(--gray-blue);
}

.footer-trust {
  max-width: 60ch;
  padding-left: .8rem;
  border-left: 2px solid var(--neon);
  font-family: var(--font-mono);
  font-size: .72rem;
  line-height: 1.7;
  color: var(--silver);
}

.footer-col {
  min-width: 0;
}

.footer-title {
  display: flex;
  align-items: center;
  gap: .5rem;
  margin-block-end: 1rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--neon);
}

.footer-title::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 3px;
  background: var(--orange);
  transform: skewX(-20deg);
}

.footer-links li + li {
  margin-top: .5rem;
}

.footer-links a {
  color: var(--silver);
  font-size: .9rem;
  transition: color .2s, padding-left .2s;
}

.footer-links a:hover {
  padding-left: .35rem;
  color: var(--neon);
}

.footer-contact li {
  display: flex;
  flex-direction: column;
  gap: .1rem;
  padding-block: .45rem;
  border-bottom: 1px dashed rgba(200, 207, 216, .12);
}

.contact-label {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gray-blue);
}

.contact-value {
  overflow-wrap: anywhere;
  font-size: .9rem;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.footer-contact .btn {
  margin-top: .8rem;
}

.footer-bottom {
  background: rgba(11, 15, 20, .7);
  border-top: 1px solid rgba(200, 207, 216, .14);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .5rem 1rem;
  padding-block: 1rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .06em;
  color: var(--gray-blue);
}

.footer-legal {
  display: inline-flex;
  gap: 1.2rem;
}

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

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

.footer-icp {
  color: rgba(200, 207, 216, .6);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 991px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 120;
    display: none;
    flex-direction: column;
    align-items: stretch;
    max-height: calc(100vh - 84px);
    overflow-y: auto;
    background: var(--bg-card);
    border-top: 1px solid rgba(0, 255, 157, .3);
    border-bottom: 1px solid rgba(200, 207, 216, .16);
  }

  .site-nav[data-open] {
    display: flex;
  }

  .nav-link {
    justify-content: flex-start;
    gap: .8rem;
    padding: .85rem 1.4rem;
    border-bottom: 1px solid rgba(200, 207, 216, .08);
    font-size: .95rem;
  }

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

  .nav-link[aria-current="page"] {
    background: rgba(0, 255, 157, .07);
    border-left: 3px solid var(--neon);
  }

  .masthead {
    min-height: 64px;
    padding-block: .6rem;
  }

  .brand-cn {
    font-size: 1.2rem;
  }

  .site-header[data-scrolled] .brand-cn {
    font-size: 1.05rem;
  }

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

  .footer-brand-col {
    grid-column: 1 / -1;
  }
}

@media (max-width: 599px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .grid-12 {
    grid-template-columns: repeat(2, 1fr);
  }

  .section {
    padding-block: 2.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.8rem;
    padding-block: 2.5rem 2rem;
  }

  .footer-bottom-inner {
    flex-direction: column;
    text-align: center;
  }

  .back-top {
    right: 1rem;
    bottom: 1rem;
  }
}

@media (max-width: 420px) {
  .menu-btn-label {
    display: none;
  }

  .login-btn {
    padding: .45rem .7rem;
  }

  .masthead {
    gap: .5rem;
    padding-inline: .75rem;
  }
}