:root {
  --bg-deep: #0B1026;
  --bg-panel: #1A1F3D;
  --accent: #39FF14;
  --accent-purple: #9D00FF;
  --text-primary: #F5F7FF;
  --text-secondary: #B0B8D4;
  --rail-width: 264px;
  --content-max: 1240px;
  --duration: 0.2s;
  --ease: cubic-bezier(0.2, 0.4, 0.35, 1);
  --panel-border: rgba(157, 0, 255, 0.3);
  --accent-glow: rgba(57, 255, 20, 0.35);
}

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

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

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-deep);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

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

a {
  color: inherit;
}

button {
  font: inherit;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(57, 255, 20, 0.15);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 16px;
  left: 16px;
  z-index: 1000;
  padding: 12px 20px;
  background: var(--accent);
  color: #0B1026;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
  border-radius: 2px;
  transform: translateY(-160%);
  transition: transform var(--duration) var(--ease);
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 900;
  pointer-events: none;
  background: transparent;
}

.scroll-progress::before {
  content: "";
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent-purple), var(--accent));
  box-shadow: 0 0 14px var(--accent-glow);
  transform: scaleX(var(--progress-scale, 0));
  transform-origin: left center;
}

.site-header {
  position: relative;
  z-index: 300;
  display: flex;
  flex-direction: column;
  background: var(--bg-deep);
}

.header-inner {
  position: relative;
  z-index: 1;
}

.brand-mark {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  min-height: 64px;
  padding: 18px 20px 14px;
  background: linear-gradient(135deg, rgba(57, 255, 20, 0.06), rgba(157, 0, 255, 0.1));
  text-decoration: none;
}

.brand-cn {
  font-size: 24px;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: 4px;
  color: var(--text-primary);
}

.brand-sub {
  margin-top: 3px;
  font-size: 12px;
  line-height: 1.2;
  letter-spacing: 6px;
  color: var(--text-secondary);
  text-transform: uppercase;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 8px 12px;
  border: 1px solid rgba(57, 255, 20, 0.4);
  border-radius: 2px;
  background: rgba(57, 255, 20, 0.08);
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--duration) var(--ease);
}

.nav-toggle:hover {
  background: rgba(57, 255, 20, 0.15);
}

.nav-toggle-box {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
  pointer-events: none;
}

.nav-toggle-line {
  display: block;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.status-tag {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-top: 1px solid var(--panel-border);
  border-bottom: 1px solid var(--panel-border);
  background: rgba(157, 0, 255, 0.07);
  color: var(--text-secondary);
  font-size: 12px;
  letter-spacing: 1px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
  animation: status-pulse 2.4s ease-in-out infinite;
}

@keyframes status-pulse {
  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.55;
  }
}

.main-nav {
  display: flex;
  flex-direction: column;
  flex: 1;
  background: var(--bg-deep);
}

.nav-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 14px;
  list-style: none;
  flex: 1 0 auto;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 10px;
  position: relative;
  border-left: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  text-decoration: none;
  transition: background var(--duration) var(--ease), color var(--duration) var(--ease), border-color var(--duration) var(--ease);
}

.nav-link::before {
  content: attr(data-index);
  min-width: 22px;
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-purple);
  opacity: 0.8;
}

.nav-link:hover {
  border-left-color: var(--accent-purple);
  background: rgba(157, 0, 255, 0.12);
  color: var(--text-primary);
}

.nav-link:hover::before {
  color: var(--accent);
}

.nav-link[aria-current="page"] {
  border-left-color: transparent;
  background: linear-gradient(90deg, var(--accent), var(--accent-purple));
  color: #0B1026;
  box-shadow: 0 0 18px rgba(57, 255, 20, 0.25);
}

.nav-link[aria-current="page"]::before {
  color: #0B1026;
}

.nav-foot {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: auto;
  padding: 18px 20px 22px;
  border-top: 1px solid var(--panel-border);
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.6;
}

.nav-foot span::before {
  content: "▲";
  margin-right: 8px;
  color: var(--accent);
  font-size: 8px;
  vertical-align: 1px;
}

.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 450;
  background: rgba(4, 7, 18, 0.72);
}

.main-content {
  min-height: 100vh;
  background:
    linear-gradient(rgba(157, 0, 255, 0.03), transparent 300px),
    var(--bg-deep);
}

.container {
  width: 100%;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 clamp(16px, 4vw, 48px);
}

.section {
  padding: clamp(40px, 8vh, 72px) 0;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}

.media-frame {
  position: relative;
  overflow: hidden;
  padding-top: 56.25%;
  border: 1px solid var(--panel-border);
  background:
    linear-gradient(135deg, rgba(57, 255, 20, 0.06), rgba(157, 0, 255, 0.1)),
    var(--bg-panel);
}

.media-frame > * {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: attr(data-caption);
  position: absolute;
  left: 12px;
  bottom: 10px;
  z-index: 1;
  padding: 2px 8px;
  border-left: 2px solid var(--accent);
  background: rgba(11, 16, 38, 0.7);
  color: var(--text-secondary);
  font-size: 12px;
  letter-spacing: 1px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  padding: 16px 0;
  list-style: none;
  color: var(--text-secondary);
  font-size: 13px;
}

.breadcrumb li {
  display: flex;
  align-items: center;
}

.breadcrumb li + li::before {
  content: "/";
  margin: 0 10px;
  color: var(--accent-purple);
}

.breadcrumb a {
  color: inherit;
  text-decoration: none;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: 2px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--duration) var(--ease), border-color var(--duration) var(--ease), color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}

.btn-primary {
  border: none;
  background: linear-gradient(90deg, var(--accent), var(--accent-purple));
  color: #F5F7FF;
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.15);
}

.btn-primary:hover {
  box-shadow: 0 0 30px rgba(57, 255, 20, 0.3);
}

.btn-ghost {
  border-color: rgba(57, 255, 20, 0.5);
  background: transparent;
  color: var(--accent);
}

.btn-ghost:hover {
  background: rgba(57, 255, 20, 0.08);
}

.site-footer {
  position: relative;
  border-top: 1px solid var(--panel-border);
  background: var(--bg-deep);
  color: var(--text-secondary);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 1.1fr 1fr;
  gap: 32px;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 48px clamp(16px, 4vw, 48px) 28px;
}

.footer-block {
  display: flex;
  flex-direction: column;
}

.footer-brand {
  gap: 8px;
}

.footer-logo {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--text-primary);
}

.footer-slogan {
  max-width: 30ch;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.footer-heading {
  margin-bottom: 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--accent-purple);
}

.footer-link {
  display: inline-block;
  width: fit-content;
  padding: 4px 0 4px 8px;
  border-left: 2px solid transparent;
  color: var(--text-secondary);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--duration) var(--ease), border-color var(--duration) var(--ease);
}

.footer-link:hover {
  border-left-color: var(--accent);
  color: var(--accent);
}

.footer-text {
  display: block;
  padding: 4px 0;
  font-size: 14px;
  color: var(--text-secondary);
}

.footer-contact {
  gap: 0;
}

.footer-links {
  gap: 2px;
}

.footer-trust,
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 28px;
  padding: 14px 20px;
  border-top: 1px solid rgba(157, 0, 255, 0.2);
  color: var(--text-secondary);
  font-size: 12px;
  letter-spacing: 1px;
}

.footer-trust span::before {
  content: "▲";
  margin-right: 8px;
  color: var(--accent);
  font-size: 8px;
  vertical-align: 2px;
}

.footer-legal {
  border-top-color: rgba(57, 255, 20, 0.15);
}

@media (min-width: 901px) {
  .skip-link {
    left: calc(var(--rail-width) + 16px);
  }

  .scroll-progress {
    left: var(--rail-width);
  }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--rail-width);
    height: 100vh;
    overflow-y: auto;
    border-right: 1px solid var(--panel-border);
    background:
      repeating-linear-gradient(
        180deg,
        transparent 0,
        transparent 27px,
        rgba(157, 0, 255, 0.06) 27px,
        rgba(157, 0, 255, 0.06) 28px
      ),
      var(--bg-deep);
  }

  .site-header::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-purple), var(--accent));
    opacity: 0.8;
  }

  .header-inner {
    display: block;
  }

  .brand-mark {
    width: 100%;
    padding: 26px 22px 22px;
  }

  .brand-cn {
    font-size: 26px;
  }

  .nav-toggle {
    display: none;
  }

  .nav-list {
    padding: 18px 12px;
  }

  .nav-overlay {
    display: none !important;
  }

  .main-content,
  .site-footer {
    margin-left: var(--rail-width);
  }
}

@media (max-width: 900px) {
  .site-header {
    position: sticky;
    top: 0;
    width: 100%;
    border-bottom: 1px solid var(--panel-border);
  }

  .site-header::after {
    content: "";
    display: block;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-purple), var(--accent), rgba(57, 255, 20, 0.2));
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 14px;
  }

  .brand-mark {
    min-height: 0;
    padding: 0;
    background: none;
  }

  .brand-cn {
    font-size: 20px;
    letter-spacing: 3px;
  }

  .brand-sub {
    font-size: 10px;
    letter-spacing: 4px;
  }

  .status-tag {
    padding: 6px 14px;
    border-top: none;
    border-bottom: 1px solid rgba(157, 0, 255, 0.15);
    font-size: 11px;
  }

  .main-nav {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 500;
    width: min(320px, 86vw);
    height: 100vh;
    border-right: 1px solid var(--accent-purple);
    background: var(--bg-panel);
    box-shadow: 10px 0 40px rgba(0, 0, 0, 0.5);
    transform: translateX(-100%);
    transition: transform var(--duration) var(--ease);
  }

  .main-nav[data-open="true"] {
    transform: translateX(0);
  }

  .nav-list {
    gap: 4px;
    padding: 70px 18px 20px;
  }

  .nav-link {
    padding: 14px 12px;
    font-size: 16px;
    border-bottom: 1px solid rgba(157, 0, 255, 0.16);
  }

  .nav-foot {
    padding: 16px 18px 20px;
  }

  .nav-toggle-text {
    font-size: 12px;
  }
}

@media (max-width: 1100px) and (min-width: 761px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 32px;
  }

  .footer-trust,
  .footer-legal {
    flex-direction: column;
    justify-content: flex-start;
    gap: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto !important;
  }
}