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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--c-space-900);
  color: var(--c-body);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

:root {
  --c-space-900: #0a1428;
  --c-space-700: #0f1f3a;
  --c-space-500: #1e3a5f;
  --c-space-300: #3a5f8a;
  --c-neon: #39ff14;
  --c-gray: #8a9ba8;
  --c-orange: #ff6b2b;
  --c-paper: #f2f5f8;
  --c-body: #c8d4de;
  --container-w: 1280px;
  --gutter: clamp(16px, 3vw, 32px);
  --font-display: Impact, "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: Inter, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 0.5em;
  line-height: 1.15;
  font-family: var(--font-display);
  color: var(--c-paper);
  font-weight: 700;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--c-neon);
}

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

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

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

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

.container {
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  z-index: 300;
  background: var(--c-neon);
  color: var(--c-space-900);
  font-weight: 800;
  padding: 10px 16px;
  text-decoration: none;
  font-size: 0.85rem;
}

.skip-link:focus {
  left: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6em;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.7em 1.2em;
  background: transparent;
  border: 2px solid transparent;
  color: var(--c-paper);
  text-decoration: none;
  position: relative;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.btn-neon {
  background: var(--c-neon);
  color: var(--c-space-900);
  border-color: var(--c-neon);
}

.btn-neon:hover {
  background: var(--c-paper);
  border-color: var(--c-paper);
  transform: translateY(-2px);
}

.btn-ghost {
  border: 2px solid var(--c-neon);
  color: var(--c-neon);
}

.btn-ghost:hover {
  background: var(--c-neon);
  color: var(--c-space-900);
}

.site-header {
  position: relative;
  background: var(--c-space-900);
  color: var(--c-paper);
  border-bottom: 2px solid var(--c-neon);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--c-neon) 0 4px, transparent 4px 12px);
  opacity: 0.55;
  pointer-events: none;
}

.header-frame {
  position: relative;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.header-frame::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 0;
  width: 14px;
  height: 14px;
  border-left: 2px solid var(--c-neon);
  border-top: 2px solid var(--c-neon);
  pointer-events: none;
}

.header-frame::after {
  content: "";
  position: absolute;
  top: 8px;
  right: 0;
  width: 14px;
  height: 14px;
  border-right: 2px solid var(--c-neon);
  border-top: 2px solid var(--c-neon);
  pointer-events: none;
}

.header-topline {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 28px;
  padding-top: 4px;
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-gray);
}

.header-tick--idx {
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: var(--c-neon);
  line-height: 1;
}

.header-tick--scan {
  flex: 1;
  height: 1px;
  background: rgba(138, 155, 168, 0.3);
}

.header-tick--status {
  white-space: nowrap;
}

.header-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--c-neon);
  margin-right: 6px;
  vertical-align: middle;
}

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 88px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
  color: var(--c-paper);
}

.brand-icon {
  font-family: var(--font-display);
  font-size: 2.1rem;
  line-height: 1;
  color: var(--c-neon);
  border: 3px solid var(--c-neon);
  padding: 0.12em 0.2em;
  background: var(--c-space-700);
  position: relative;
  letter-spacing: 0.03em;
}

.brand-icon::after {
  content: "";
  position: absolute;
  right: -6px;
  bottom: -6px;
  width: 10px;
  height: 10px;
  background: var(--c-neon);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.45rem;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--c-paper);
}

.brand-tagline {
  font-size: 0.62rem;
  color: var(--c-gray);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.site-nav {
  margin-left: auto;
}

.nav-list {
  display: flex;
  list-style: none;
  align-items: stretch;
}

.nav-item {
  position: relative;
  margin-left: 2px;
}

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 12px;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--c-paper);
  text-decoration: none;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  position: relative;
  transition: color 0.15s ease, background 0.15s ease;
}

.nav-link:hover {
  color: var(--c-neon);
  background: rgba(15, 31, 58, 0.55);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 8px;
  right: 8px;
  bottom: 4px;
  height: 3px;
  background: var(--c-neon);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s ease-out;
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

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

.nav-index {
  font-family: var(--font-display);
  font-size: 0.65rem;
  color: var(--c-orange);
  font-weight: 800;
}

.nav-label {
  letter-spacing: 0.05em;
}

.header-cta {
  margin-left: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--c-neon);
  color: var(--c-space-900);
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  padding: 10px 16px;
  text-decoration: none;
  border: none;
  position: relative;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 100%, 0 100%);
  transition: background 0.15s ease, color 0.15s ease;
}

.header-cta:hover {
  background: var(--c-paper);
  color: var(--c-space-900);
}

.cta-arrow {
  display: inline-block;
  transition: transform 0.15s ease;
}

.header-cta:hover .cta-arrow {
  transform: translateX(4px);
}

.nav-toggle {
  display: none;
  padding: 10px;
  background: transparent;
  border: 1px solid rgba(242, 245, 248, 0.2);
  flex-direction: column;
  gap: 4px;
  cursor: pointer;
  transition: border-color 0.15s ease;
}

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

.nav-toggle-line {
  width: 24px;
  height: 3px;
  background: var(--c-paper);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) 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(-7px) rotate(-45deg);
}

.header-progress {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 2px;
  width: 100%;
  background: var(--c-orange);
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
  z-index: 5;
}

body.nav-lock {
  overflow: hidden;
}

.site-footer {
  position: relative;
  background: var(--c-space-900);
  color: var(--c-gray);
  border-top: 2px solid var(--c-neon);
  margin-top: 0;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--c-neon) 0 2px, transparent 2px 14px);
  opacity: 0.5;
  pointer-events: none;
}

.footer-grid {
  position: relative;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 52px var(--gutter) 36px;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 2fr;
  gap: 28px;
}

.footer-grid::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 16px;
  height: 16px;
  border-left: 2px solid var(--c-neon);
  border-bottom: 2px solid var(--c-neon);
  pointer-events: none;
}

.footer-grid::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 16px;
  height: 16px;
  border-right: 2px solid var(--c-neon);
  border-bottom: 2px solid var(--c-neon);
  pointer-events: none;
}

.footer-brand {
  font-size: 0.9rem;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--c-paper);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.footer-logo-mark {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--c-neon);
  border: 2px solid var(--c-neon);
  padding: 0.08em 0.18em;
  line-height: 1;
}

.footer-desc {
  margin-top: 14px;
  max-width: 40ch;
}

.footer-trust {
  margin-top: 14px;
  font-size: 0.8rem;
  color: var(--c-gray);
  border-left: 3px solid var(--c-orange);
  padding-left: 10px;
}

.footer-col {
  font-size: 0.88rem;
}

.footer-heading {
  font-family: var(--font-display);
  color: var(--c-paper);
  letter-spacing: 0.08em;
  margin-bottom: 12px;
  font-size: 1.05rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 6px;
}

.footer-links a {
  color: var(--c-gray);
  text-decoration: none;
  display: inline-block;
  padding: 2px 0;
  font-size: 0.86rem;
  transition: color 0.15s ease, padding-left 0.15s ease;
}

.footer-links a:hover {
  color: var(--c-neon);
  padding-left: 4px;
}

.footer-contact {
  font-size: 0.86rem;
}

.footer-contact-line {
  margin: 8px 0;
  word-break: break-all;
}

.footer-bottom {
  border-top: 1px solid rgba(138, 155, 168, 0.18);
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 18px var(--gutter);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.78rem;
  color: var(--c-gray);
}

.footer-bottom p {
  margin: 0;
}

.footer-toplink {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 90;
  padding: 12px 14px;
  background: var(--c-neon);
  color: var(--c-space-900);
  border: none;
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease, background 0.2s ease;
}

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

.footer-toplink:hover {
  background: var(--c-paper);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.8rem;
  color: var(--c-gray);
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-gray);
  opacity: 0.5;
}

.breadcrumb a {
  color: var(--c-neon);
  text-decoration: none;
}

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

.text-block {
  max-width: 72ch;
}

.text-block p {
  color: var(--c-body);
  line-height: 1.72;
}

.text-block a {
  color: var(--c-neon);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-neon);
}

.section-label::before {
  content: "";
  width: 28px;
  height: 6px;
  background: var(--c-neon);
  display: inline-block;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 3.2rem);
  line-height: 1.05;
  margin: 0.45em 0 0.35em;
  color: var(--c-paper);
  text-transform: uppercase;
}

.section-intro {
  max-width: 58ch;
  color: var(--c-body);
  margin-bottom: 24px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 18px;
  margin: 24px 0;
}

.data-card {
  background: var(--c-space-700);
  border: 1px solid var(--c-space-300);
  padding: 22px 18px;
  position: relative;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.15s ease;
}

.data-card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 4px;
  background: var(--c-neon);
  transition: width 0.15s ease;
}

.data-card:hover {
  background: var(--c-space-500);
  border-color: var(--c-neon);
}

.data-card:hover::after {
  width: 100%;
}

.tag {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-orange);
  background: rgba(255, 107, 43, 0.12);
  border: 1px solid rgba(255, 107, 43, 0.4);
  padding: 3px 8px;
}

.media-frame {
  position: relative;
  background: var(--c-space-700);
  border: 1px solid var(--c-space-300);
  overflow: hidden;
  aspect-ratio: 16 / 9;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(rgba(57, 255, 20, 0.08), transparent 65%),
    repeating-linear-gradient(45deg, rgba(57, 255, 20, 0.05) 0 1px, transparent 1px 10px);
  opacity: 0.65;
  pointer-events: none;
}

.media-frame img {
  position: relative;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

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

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

@media (max-width: 960px) {
  .header-main {
    min-height: 68px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    margin-left: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--c-space-700);
    border-bottom: 4px solid var(--c-neon);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.35);
    padding: 10px var(--gutter) 22px;
    z-index: 100;
  }

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

  .nav-list {
    flex-direction: column;
  }

  .nav-item {
    margin-left: 0;
    border-bottom: 1px solid rgba(242, 245, 248, 0.08);
  }

  .nav-item:last-child {
    border-bottom: none;
  }

  .nav-link {
    justify-content: space-between;
    padding: 14px 4px;
    width: 100%;
  }

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

  .header-cta {
    display: flex;
    justify-content: center;
    margin: 14px 0 0;
  }

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

@media (max-width: 640px) {
  .header-topline {
    justify-content: space-between;
  }

  .header-tick--scan,
  .header-tick--status {
    display: none;
  }

  .brand-tagline {
    display: none;
  }

  .brand-name {
    font-size: 1.15rem;
  }

  .brand-icon {
    font-size: 1.7rem;
  }

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

  .footer-bottom {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }

  html {
    scroll-behavior: auto;
  }
}