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

:root {
  --site-bg: #0A0F14;
  --site-bg-alt: #101820;
  --site-card: #16212B;
  --site-line: rgba(255, 255, 255, 0.08);
  --site-text: #F2F6FA;
  --site-muted: #8A94A0;
  --electric-blue: #00E5FF;
  --acid-green: #C6FF00;
  --violet: #7A5CFF;
  --header-width: 288px;
  --footer-gap: 3px;
  --transition-speed: 300ms;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --font-head: "Noto Sans CJK SC Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-num: "DIN Alternate", "Inter", "PingFang SC", sans-serif;
  --max-width: 1440px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

@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;
  }
}

body {
  background: var(--site-bg);
  color: var(--site-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  min-height: 100vh;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-speed) var(--ease-out), border-color var(--transition-speed) var(--ease-out), background-color var(--transition-speed) var(--ease-out);
}

ul,
ol {
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--electric-blue);
  outline-offset: 4px;
  border-radius: 2px;
}

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

/* 头部 */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--header-width);
  background: linear-gradient(175deg, var(--site-bg-alt), #0C1319 100%);
  border-right: 1px solid var(--site-line);
  z-index: 1200;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
}

.site-header-inner {
  padding: 32px 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 26px;
  flex: 1;
}

.site-logo {
  display: flex;
  flex-direction: column;
  gap: 4px;
  position: relative;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--site-line);
  transition: border-color var(--transition-speed) var(--ease-out);
}

.site-logo:hover {
  border-bottom-color: rgba(255, 255, 255, 0.2);
}

.site-logo-text {
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--site-text);
  -webkit-text-stroke: 0.5px rgba(0, 229, 255, 0.3);
  text-transform: uppercase;
}

.site-logo-sub {
  font-size: 12px;
  color: var(--site-muted);
  letter-spacing: 0.14em;
}

.site-logo-badge {
  position: absolute;
  right: 0;
  top: 4px;
  font-size: 10px;
  line-height: 1;
  font-family: var(--font-body);
  font-weight: 700;
  padding: 4px 7px;
  background: var(--site-card);
  border: 1px solid var(--site-line);
  border-radius: 2px;
  color: var(--electric-blue);
  letter-spacing: 0.08em;
  transform: skewX(-8deg);
  transition: background var(--transition-speed) var(--ease-out), border-color var(--transition-speed) var(--ease-out);
}

.site-logo:hover .site-logo-badge {
  background: rgba(0, 229, 255, 0.12);
  border-color: rgba(0, 229, 255, 0.3);
}

.site-nav {
  flex: 1;
  display: block;
}

.site-nav-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.site-nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  color: var(--site-muted);
  border-left: 2px solid transparent;
  transition: color var(--transition-speed) var(--ease-out), background-color var(--transition-speed) var(--ease-out), border-color var(--transition-speed) var(--ease-out), padding-left var(--transition-speed) var(--ease-out);
  position: relative;
}

.site-nav-link::before {
  content: "";
  display: block;
  width: 6px;
  height: 6px;
  background: transparent;
  transform: rotate(45deg);
  flex-shrink: 0;
  transition: background-color var(--transition-speed) var(--ease-out);
}

.site-nav-link:hover {
  color: var(--site-text);
  padding-left: 18px;
  background: rgba(255, 255, 255, 0.03);
}

.site-nav-link:hover::before {
  background: var(--electric-blue);
}

.site-nav-link[aria-current="page"] {
  color: var(--site-text);
  border-left-color: var(--electric-blue);
  background: linear-gradient(90deg, rgba(0, 229, 255, 0.12), transparent);
  padding-left: 18px;
}

.site-nav-link[aria-current="page"]::before {
  background: var(--acid-green);
}

.site-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--acid-green);
  color: #0A0F14;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 15px;
  line-height: 1.2;
  padding: 13px 18px;
  border-radius: 0;
  transform: skewX(-8deg);
  transition: transform var(--transition-speed) var(--ease-out), box-shadow var(--transition-speed) var(--ease-out), color var(--transition-speed) var(--ease-out), background-color var(--transition-speed) var(--ease-out);
  box-shadow: 0 0 0 rgba(0, 0, 0, 0);
  letter-spacing: 0.04em;
  text-align: center;
}

.site-cta span {
  transform: skewX(8deg);
}

.site-cta:hover {
  transform: skewX(-8deg) translateY(-2px);
  box-shadow: 0 8px 24px rgba(198, 255, 0, 0.18), 0 0 0 1px rgba(198, 255, 0, 0.2);
  color: var(--site-bg);
}

.site-cta:active {
  transform: skewX(-8deg) translateY(0);
}

.site-header-foot {
  border-top: 1px solid var(--site-line);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.site-header-note {
  font-size: 11px;
  color: var(--site-muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.data-ticker {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 11px;
  color: var(--site-muted);
  padding-left: 12px;
  border-left: 2px solid var(--violet);
  background: linear-gradient(90deg, rgba(122, 92, 255, 0.08), transparent);
  line-height: 1.5;
  padding-top: 4px;
  padding-bottom: 4px;
}

.data-ticker span {
  display: block;
}

.data-ticker span::before {
  content: "";
  display: inline-block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--violet);
  margin-right: 8px;
  vertical-align: middle;
  animation: pulse-dot 1.8s ease-out infinite;
}

@keyframes pulse-dot {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.4;
  }
}

.site-nav-toggle {
  display: none;
  position: fixed;
  top: 20px;
  left: 20px;
  width: 44px;
  height: 44px;
  background: var(--site-bg-alt);
  border: 1px solid var(--site-line);
  border-left-color: var(--electric-blue);
  border-radius: 0;
  cursor: pointer;
  z-index: 1300;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 10px;
  flex-direction: column;
  transition: background-color var(--transition-speed) var(--ease-out), border-color var(--transition-speed) var(--ease-out);
}

.site-nav-toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--site-text);
  transform-origin: center;
  transition: transform var(--transition-speed) var(--ease-out), opacity var(--transition-speed) var(--ease-out), background-color var(--transition-speed) var(--ease-out);
}

.site-nav-toggle:hover {
  background: var(--site-card);
  border-color: var(--electric-blue);
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--acid-green);
}

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

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--acid-green);
}

.page-skip-link {
  position: fixed;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--acid-green);
  color: var(--site-bg);
  padding: 12px 24px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 14px;
  z-index: 1500;
  transition: top var(--transition-speed) var(--ease-out);
  border-radius: 0 0 4px 4px;
  clip-path: polygon(0 0, 100% 0, 98% 100%, 2% 100%);
}

.page-skip-link:focus {
  top: 0;
  outline: none;
}

/* 页脚 */
.site-footer {
  background: var(--site-bg-alt);
  border-top: 1px solid var(--site-line);
  padding: 48px 24px 20px;
  margin-left: var(--header-width);
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--acid-green), var(--electric-blue), var(--violet));
  opacity: 0.6;
}

.site-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.site-footer-main {
  display: grid;
  grid-template-columns: 2fr 1.5fr 1fr;
  gap: 48px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--site-line);
}

.footer-brand-mark {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 900;
  color: var(--site-bg);
  background: var(--electric-blue);
  padding: 6px 10px;
  margin-bottom: 14px;
  transform: skewX(-8deg);
  letter-spacing: 0.06em;
}

.footer-brand-text {
  color: var(--site-muted);
  font-size: 14px;
  line-height: 1.7;
  max-width: 420px;
  margin-top: 10px;
}

.footer-title {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--site-text);
  margin-bottom: 16px;
  padding-left: 14px;
  position: relative;
}

.footer-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 4px;
  height: 4px;
  background: var(--acid-green);
  transform: translateY(-50%) rotate(45deg);
}

.footer-contact p {
  font-size: 14px;
  color: var(--site-muted);
  line-height: 1.8;
  word-break: break-all;
}

.footer-contact a {
  color: var(--electric-blue);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 14px;
  transition: color var(--transition-speed) var(--ease-out);
}

.footer-contact a:hover {
  color: var(--site-text);
  text-decoration: underline;
  text-decoration-color: var(--electric-blue);
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.footer-note {
  font-size: 12px;
  color: rgba(138, 148, 160, 0.7);
  border-left: 2px solid var(--violet);
  padding-left: 10px;
  margin-top: 12px;
  line-height: 1.5;
}

.footer-policies ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-policies a {
  color: var(--site-muted);
  font-size: 14px;
  padding: 4px 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: color var(--transition-speed) var(--ease-out), padding-left var(--transition-speed) var(--ease-out);
}

.footer-policies a::before {
  content: "›";
  color: var(--electric-blue);
  font-weight: 700;
  font-size: 16px;
  line-height: 1;
  transition: transform var(--transition-speed) var(--ease-out);
}

.footer-policies a:hover {
  color: var(--site-text);
  padding-left: 4px;
}

.footer-policies a:hover::before {
  transform: translateX(2px);
}

.site-footer-meta {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  padding-top: 20px;
  font-size: 12px;
  color: var(--site-muted);
}

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

.footer-trust {
  border-left: 2px solid var(--acid-green);
  padding-left: 12px;
  line-height: 1.4;
  max-width: 420px;
  color: rgba(138, 148, 160, 0.7);
}

/* 滚动进度条 */
.data-scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--acid-green), var(--electric-blue), var(--violet));
  z-index: 1400;
  transition: width 0.1s linear;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .data-scroll-progress {
    transition: none;
  }
}

/* 主内容容器 */
#main-content {
  min-height: calc(100vh - 240px);
  margin-left: var(--header-width);
}

/* 通用容器 */
.page-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 32px 64px;
}

/* 网格和排版基础 */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.col-8 {
  grid-column: span 8;
}

.col-4 {
  grid-column: span 4;
}

.col-6 {
  grid-column: span 6;
}

.col-3 {
  grid-column: span 3;
}

.col-12 {
  grid-column: span 12;
}

.section-index {
  display: inline-block;
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  color: var(--electric-blue);
  letter-spacing: 0.2em;
  margin-bottom: 10px;
  transform: skewX(-8deg);
  text-transform: uppercase;
}

/* 数据卡片与统计 */
.data-glass-card {
  background: linear-gradient(145deg, rgba(22, 33, 43, 0.9), rgba(16, 24, 32, 0.95));
  border: 1px solid var(--site-line);
  border-top: 3px solid var(--electric-blue);
  padding: 24px;
  position: relative;
  transition: border-color var(--transition-speed) var(--ease-out), transform var(--transition-speed) var(--ease-out), box-shadow var(--transition-speed) var(--ease-out);
}

.data-glass-card:hover {
  border-color: rgba(0, 229, 255, 0.35);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3), 0 0 24px rgba(0, 229, 255, 0.06);
}

.data-glass-card::after {
  content: attr(data-index);
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--site-muted);
  font-weight: 700;
  transform: rotate(90deg);
  transform-origin: top right;
  letter-spacing: 0.1em;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.metric-number {
  font-family: var(--font-num);
  font-size: clamp(36px, 4vw, 64px);
  font-weight: 700;
  color: var(--acid-green);
  line-height: 1;
  font-feature-settings: "tnum" 1;
  letter-spacing: 0.02em;
  display: block;
}

.metric-label {
  font-size: 13px;
  color: var(--site-muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-top: 6px;
}

/* 斜切装饰 */
.clip-angle {
  display: inline-block;
  background: var(--site-card);
  border-left: 2px solid var(--electric-blue);
  padding: 8px 14px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  color: var(--site-text);
  clip-path: polygon(0 0, 100% 0, 96% 100%, 0 100%);
}

/* 分类标签 */
.issue-tag {
  display: inline-block;
  font-size: 11px;
  font-family: var(--font-body);
  font-weight: 600;
  padding: 4px 8px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transform: skewX(-8deg);
}

.issue-tag--violet {
  background: rgba(122, 92, 255, 0.18);
  color: #B39DFF;
  border: 1px solid rgba(122, 92, 255, 0.3);
}

.issue-tag--cyan {
  background: rgba(0, 229, 255, 0.12);
  color: var(--electric-blue);
  border: 1px solid rgba(0, 229, 255, 0.3);
}

.issue-tag--lime {
  background: rgba(198, 255, 0, 0.12);
  color: var(--acid-green);
  border: 1px solid rgba(198, 255, 0, 0.3);
}

/* 通用内容样式 */
.page-title {
  font-family: var(--font-head);
  font-size: clamp(32px, 5vw, 64px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--site-text);
  margin-bottom: 16px;
  position: relative;
  transform: skewX(-2deg);
}

.page-title::after {
  content: "";
  display: block;
  width: 72px;
  height: 4px;
  background: linear-gradient(90deg, var(--acid-green), var(--electric-blue));
  margin-top: 12px;
  clip-path: polygon(0 0, 100% 0, 90% 100%, 0 100%);
}

.page-description {
  color: var(--site-muted);
  font-size: 16px;
  line-height: 1.7;
  max-width: 640px;
  margin-bottom: 32px;
}

/* 内容层级 */
.content-menu {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 0;
  border-top: 1px solid var(--site-line);
  border-bottom: 1px solid var(--site-line);
  margin-bottom: 24px;
}

.content-menu a {
  font-size: 13px;
  font-weight: 600;
  color: var(--site-muted);
  padding: 6px 14px;
  background: var(--site-card);
  transition: background-color var(--transition-speed) var(--ease-out), color var(--transition-speed) var(--ease-out);
}

.content-menu a:hover {
  background: rgba(0, 229, 255, 0.1);
  color: var(--electric-blue);
}

/* 图片容器基础规则 */
.image-frame {
  position: relative;
  overflow: hidden;
  background: var(--site-card);
  border: 1px solid var(--site-line);
  aspect-ratio: 16 / 9;
  min-height: 180px;
}

.image-frame--square {
  aspect-ratio: 1 / 1;
}

.image-frame--wide {
  aspect-ratio: 21 / 9;
}

.image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform calc(var(--transition-speed) * 2) var(--ease-out);
}

.image-frame:hover img {
  transform: scale(1.03);
}

.image-frame::after {
  content: attr(data-caption);
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 8px 12px;
  font-size: 12px;
  color: rgba(242, 246, 250, 0.9);
  background: linear-gradient(transparent, rgba(10, 15, 20, 0.85));
  pointer-events: none;
}

/* 页面专属布局预留 */
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
  gap: 48px;
  align-items: end;
}

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--site-muted);
  margin-bottom: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--site-line);
}

.breadcrumb a {
  color: var(--site-muted);
}

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

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

/* responsive */
@media (max-width: 1024px) {
  .site-footer-main {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .col-8,
  .col-4,
  .col-6,
  .col-3 {
    grid-column: span 12;
  }
}

@media (max-width: 860px) {
  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: 100%;
    height: 64px;
    border-right: none;
    border-bottom: 1px solid var(--site-line);
    background: rgba(10, 15, 20, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1200;
    overflow: visible;
  }

  .site-header-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    height: 64px;
    gap: 16px;
    flex-wrap: wrap;
  }

  .site-logo {
    border-bottom: none;
    padding-bottom: 0;
    flex: 0 0 auto;
  }

  .site-logo-text {
    font-size: 18px;
    line-height: 1;
  }

  .site-logo-sub,
  .site-logo-badge {
    display: none;
  }

  .site-nav-toggle {
    display: inline-flex;
    position: static;
    order: 2;
    flex-shrink: 0;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    width: 100%;
    max-height: calc(100vh - 64px);
    background: rgba(16, 24, 32, 0.98);
    border-bottom: 1px solid var(--site-line);
    padding: 16px;
    overflow-y: auto;
    box-shadow: 0 24px 40px rgba(0, 0, 0, 0.4);
  }

  .site-nav[data-open="true"] {
    display: block;
    animation: nav-drop var(--transition-speed) var(--ease-out);
  }

  @keyframes nav-drop {
    from {
      opacity: 0;
      transform: translateY(-12px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .site-cta {
    display: none;
  }

  .site-header-foot {
    display: none;
  }

  .data-ticker {
    display: none;
  }

  #main-content {
    margin-left: 0;
    padding-top: 64px;
  }

  .site-footer {
    margin-left: 0;
    padding: 32px 20px 16px;
  }
}

@media (max-width: 540px) {
  .page-container {
    padding: 24px 16px 40px;
  }

  .site-footer-main {
    gap: 24px;
  }

  .site-footer-meta {
    flex-direction: column;
    align-items: flex-start;
  }

  .grid-12 {
    gap: 16px;
  }

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

/* 通用按钮复用 */
.btn-base {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 14px;
  line-height: 1;
  padding: 12px 20px;
  border: 1px solid var(--site-line);
  background: var(--site-card);
  color: var(--site-text);
  cursor: pointer;
  transition: background-color var(--transition-speed) var(--ease-out), border-color var(--transition-speed) var(--ease-out), color var(--transition-speed) var(--ease-out), transform var(--transition-speed) var(--ease-out), box-shadow var(--transition-speed) var(--ease-out);
  text-align: center;
}

.btn-base:hover {
  border-color: var(--electric-blue);
  background: rgba(0, 229, 255, 0.08);
  color: var(--electric-blue);
  transform: translateY(-2px);
}

.btn-primary {
  display: inline-block;
  background: var(--acid-green);
  color: var(--site-bg);
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  line-height: 1;
  padding: 12px 20px;
  border: none;
  border-radius: 0;
  cursor: pointer;
  transition: background-color var(--transition-speed) var(--ease-out), color var(--transition-speed) var(--ease-out), transform var(--transition-speed) var(--ease-out), box-shadow var(--transition-speed) var(--ease-out);
  text-align: center;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, 100% 0, 96% 100%, 0 100%);
}

.btn-primary:hover {
  background: var(--site-text);
  color: var(--site-bg);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  transform: translateY(-2px);
}

.btn-primary:focus {
  outline: 2px solid var(--electric-blue);
}

/* 收起与展开组件 */
.expandable-group {
  border: 1px solid var(--site-line);
  background: rgba(16, 24, 32, 0.4);
  transition: border-color var(--transition-speed) var(--ease-out), background-color var(--transition-speed) var(--ease-out);
}

.expandable-group:hover {
  border-color: rgba(0, 229, 255, 0.3);
}

.expandable-toggle {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  background: transparent;
  border: none;
  color: var(--site-text);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: background-color var(--transition-speed) var(--ease-out);
}

.expandable-toggle:hover {
  background: rgba(255, 255, 255, 0.02);
}

.expandable-toggle::after {
  content: "";
  display: block;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--site-muted);
  border-bottom: 2px solid var(--site-muted);
  transform: rotate(45deg);
  transition: transform var(--transition-speed) var(--ease-out), border-color var(--transition-speed) var(--ease-out);
}

.expandable-toggle[aria-expanded="true"]::after {
  transform: rotate(-135deg);
  border-color: var(--electric-blue);
}

.expandable-panel {
  display: none;
  padding: 0 20px 16px;
  color: var(--site-muted);
  font-size: 14px;
  line-height: 1.7;
}

.expandable-panel[data-open="true"] {
  display: block;
}

/* 入场显现动画 */
.section-reveal {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--transition-speed) var(--ease-out), transform var(--transition-speed) var(--ease-out);
}

.section-reveal[data-visible="true"] {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .section-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* 彩色斜切装饰条 */
.clip-divider {
  height: 6px;
  width: 100%;
  background: linear-gradient(90deg, var(--electric-blue) 0%, var(--acid-green) 40%, transparent 100%);
  clip-path: polygon(0 0, 100% 0, 98% 100%, 2% 100%);
  opacity: 0.5;
  border: none;
  margin: 0;
}

/* 移动端头部徽章适配 */
@media (max-width: 860px) {
  .data-scroll-progress {
    top: 64px;
  }
}

/* 配合A/B测试：site-main基础可用性 */
.site-main {
  margin-left: var(--header-width);
}

@media (max-width: 860px) {
  .site-main {
    margin-left: 0;
  }
}

/* 锚点跳转平滑但不影响a11y */
@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

/* J9专用装饰组件 */
.vs-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 12px;
  color: var(--electric-blue);
  border: 1px solid rgba(0, 229, 255, 0.3);
  background: var(--site-card);
  padding: 4px 8px;
  transform: skewX(-8deg);
  letter-spacing: 0.1em;
}