:root {
  --c-deep: #0a1f3c;
  --c-neon: #39ff14;
  --c-orange: #ff6b35;
  --c-data: #4a90d9;
  --c-cloud: #f5f7fa;
  --c-obsidian: #1a1a2e;
  --c-white: #ffffff;
  --c-sand: #d4a574;
  --c-iron: #7f8fa6;
  --c-iron-light: #aebdd0;

  --font-head: "DIN Alternate", "Impact", "Arial Black", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", monospace;

  --container-width: 1200px;
  --container-pad: clamp(1rem, 3vw, 2rem);

  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 5rem;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-cloud);
  background:
    radial-gradient(ellipse at 85% -10%, rgba(74, 144, 217, 0.25), transparent 60%),
    radial-gradient(circle at 8% 12%, rgba(57, 255, 20, 0.07), transparent 35%),
    var(--c-deep);
  -webkit-font-smoothing: antialiased;
}

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

ul,
ol {
  margin-top: 0;
}

p {
  margin-bottom: 1rem;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.5em;
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.2;
  color: var(--c-white);
}

h1 {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.125rem);
}

h3 {
  font-size: 1.25rem;
}

h4 {
  font-size: 1.125rem;
}

a {
  color: var(--c-neon);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  text-decoration: underline;
}

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

::selection {
  background: var(--c-neon);
  color: var(--c-deep);
}

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

button,
input,
select,
textarea {
  font: inherit;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

#main-content,
.main-content {
  display: block;
  flex: 1 0 auto;
  width: 100%;
  outline: none;
}

.section {
  position: relative;
  padding: clamp(3rem, 6vw, 5.5rem) 0;
}

.section--light {
  background: var(--c-cloud);
  color: var(--c-obsidian);
}

.section--light h1,
.section--light h2,
.section--light h3 {
  color: var(--c-obsidian);
}

.section--dark {
  background: var(--c-obsidian);
}

.grid {
  display: grid;
  gap: var(--space-lg);
}

.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));
}

.grid--12 {
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.grid--main-aside {
  grid-template-columns: minmax(0, 1fr) 320px;
}

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

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

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

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

.col-span-9 {
  grid-column: span 9;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: 2px solid transparent;
  border-radius: 0;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-cloud);
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  text-decoration: none;
  filter: brightness(1.08);
}

.btn--primary {
  background: var(--c-neon);
  border-color: var(--c-neon);
  color: var(--c-deep);
}

.btn--primary:hover {
  background: var(--c-white);
  border-color: var(--c-white);
}

.btn--outline {
  border-color: var(--c-neon);
  color: var(--c-neon);
}

.btn--outline:hover {
  background: var(--c-neon);
  color: var(--c-deep);
}

.btn--orange {
  background: var(--c-orange);
  border-color: var(--c-orange);
  color: var(--c-deep);
}

.btn--orange:hover {
  background: var(--c-white);
  border-color: var(--c-white);
}

.btn--lg {
  padding: 1rem 2rem;
  font-size: 0.9rem;
}

.btn--sm {
  padding: 0.4rem 0.9rem;
  font-size: 0.7rem;
}

.btn--block {
  display: flex;
  width: 100%;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.2rem 0.6rem;
  border: 1px solid rgba(74, 144, 217, 0.5);
  border-radius: 2px;
  background: rgba(74, 144, 217, 0.08);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--c-data);
  white-space: nowrap;
}

.tag--neon {
  border-color: rgba(57, 255, 20, 0.5);
  background: rgba(57, 255, 20, 0.08);
  color: var(--c-neon);
}

.tag--orange {
  border-color: rgba(255, 107, 53, 0.5);
  background: rgba(255, 107, 53, 0.08);
  color: var(--c-orange);
}

.tag--outline {
  background: transparent;
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  padding: 0.75rem 1rem;
  border: 1px solid rgba(74, 144, 217, 0.25);
  background: rgba(10, 31, 60, 0.6);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--c-iron);
}

.legend__item {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.legend__swatch {
  width: 8px;
  height: 8px;
  border: 1px solid rgba(245, 247, 250, 0.5);
  background: var(--c-data);
}

.legend__swatch--neon {
  background: var(--c-neon);
  border-color: var(--c-neon);
}

.legend__swatch--orange {
  background: var(--c-orange);
  border-color: var(--c-orange);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.breadcrumb__item a {
  color: var(--c-iron);
}

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

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

.breadcrumb__sep {
  color: var(--c-iron);
  opacity: 0.6;
}

.index-head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.index-head__idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--c-neon);
  white-space: nowrap;
}

.index-head__title {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  line-height: 1.1;
  color: var(--c-white);
}

.index-head__bar {
  flex: 1;
  min-width: 2rem;
  height: 1px;
  background: linear-gradient(90deg, rgba(74, 144, 217, 0.5), transparent);
}

.index-head__more {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--c-iron);
  white-space: nowrap;
}

.index-head--light .index-head__title {
  color: var(--c-obsidian);
}

.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid rgba(74, 144, 217, 0.2);
  border-radius: 0;
  background: linear-gradient(140deg, rgba(74, 144, 217, 0.25), rgba(10, 31, 60, 0.4)), rgba(74, 144, 217, 0.15);
}

.media--ratio-21x9 {
  aspect-ratio: 21 / 9;
}

.media--ratio-16x9 {
  aspect-ratio: 16 / 9;
}

.media--ratio-4x3 {
  aspect-ratio: 4 / 3;
}

.media--ratio-1x1 {
  aspect-ratio: 1 / 1;
}

.media > img,
.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--placeholder::before {
  content: "6T/IMG";
  position: absolute;
  inset: 0.75rem;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed rgba(74, 144, 217, 0.35);
  background: linear-gradient(135deg, rgba(10, 31, 60, 0.75), rgba(26, 26, 46, 0.65));
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: rgba(245, 247, 250, 0.6);
}

.card {
  padding: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-left: 2px solid var(--c-neon);
  border-radius: 0;
  background: rgba(245, 247, 250, 0.04);
  transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.card:hover {
  border-color: rgba(57, 255, 20, 0.45);
  transform: translateY(-2px);
}

.panel {
  padding: 1.5rem;
  border: 1px solid rgba(74, 144, 217, 0.25);
  border-radius: 0;
  background: rgba(74, 144, 217, 0.08);
}

.kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-neon);
}

.lead {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--c-iron-light);
}

.mono {
  font-family: var(--font-mono);
}

.skip-link {
  position: fixed;
  top: -4rem;
  left: 1rem;
  z-index: 1000;
  padding: 0.6rem 1.2rem;
  background: var(--c-neon);
  color: var(--c-deep);
  font-weight: 700;
  font-size: 0.85rem;
  border-radius: 0;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 1rem;
  text-decoration: none;
}

.site-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 900;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-neon), var(--c-orange));
  pointer-events: none;
}

.site-topbar {
  background: var(--c-obsidian);
  border-bottom: 1px solid rgba(57, 255, 20, 0.18);
  color: var(--c-iron);
}

.site-topbar__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0.35rem var(--container-pad);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem 1rem;
}

.site-topbar__notice {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--c-iron-light);
}

.site-topbar__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-neon);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.15);
  flex-shrink: 0;
}

.site-topbar__coord {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  color: var(--c-sand);
  white-space: nowrap;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: transparent;
}

.site-header__inner {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0.75rem var(--container-pad);
}

.site-header__island {
  position: relative;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.45rem 0.5rem 0.45rem 0.9rem;
  background: rgba(10, 31, 60, 0.88);
  border: 1px solid rgba(74, 144, 217, 0.35);
  border-left: 3px solid var(--c-neon);
  border-radius: 999px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.site-header[data-scrolled] .site-header__island {
  background: rgba(10, 31, 60, 0.94);
  box-shadow: 0 10px 36px rgba(0, 0, 0, 0.5);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
  text-decoration: none;
}

.site-brand:hover {
  text-decoration: none;
}

.site-brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.4rem;
  height: 2.4rem;
  background: var(--c-neon);
  color: var(--c-deep);
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1;
  border-radius: 0;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.site-brand:hover .site-brand__mark {
  background: var(--c-orange);
  color: var(--c-white);
}

.site-brand__group {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.site-brand__name {
  font-family: var(--font-head);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-white);
  white-space: nowrap;
}

.site-brand__tagline {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--c-iron);
  white-space: nowrap;
}

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

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.3rem;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--c-cloud);
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.site-nav__link:hover {
  background: rgba(74, 144, 217, 0.18);
  color: var(--c-white);
  text-decoration: none;
}

.site-nav__link[aria-current="page"] {
  background: var(--c-neon);
  color: var(--c-deep);
  font-weight: 700;
}

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.05em;
  color: var(--c-data);
  opacity: 0.85;
  transition: color 0.2s ease;
}

.site-nav__link:hover .site-nav__idx {
  color: var(--c-neon);
}

.site-nav__link[aria-current="page"] .site-nav__idx {
  color: var(--c-deep);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
  flex-shrink: 0;
}

.site-header__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.2rem;
  border: 1px solid var(--c-orange);
  border-radius: 999px;
  color: var(--c-orange);
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.site-header__cta:hover {
  background: var(--c-orange);
  color: var(--c-deep);
  text-decoration: none;
}

.site-nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 2.6rem;
  height: 2.6rem;
  padding: 0;
  border: 1px solid rgba(74, 144, 217, 0.35);
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.site-nav-toggle:hover {
  border-color: var(--c-neon);
  background: rgba(57, 255, 20, 0.08);
}

.site-nav-toggle__line {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--c-neon);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__line:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.site-nav-toggle[aria-expanded="true"] .site-nav-toggle__line:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

.site-footer {
  position: relative;
  margin-top: auto;
  background:
    radial-gradient(ellipse at 50% 0%, rgba(74, 144, 217, 0.15), transparent 60%),
    var(--c-obsidian);
  color: var(--c-iron);
  border-top: 1px solid rgba(57, 255, 20, 0.25);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--c-neon) 0%, var(--c-orange) 40%, transparent 80%);
  pointer-events: none;
}

.site-footer__top {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: clamp(2.5rem, 5vw, 4rem) var(--container-pad) 2rem;
  display: grid;
  grid-template-columns: minmax(0, 1.8fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.4fr);
  gap: clamp(1.5rem, 4vw, 3rem);
}

.site-footer__brand,
.site-footer__nav,
.site-footer__contact {
  min-width: 0;
}

.site-footer__statement {
  margin: 1rem 0;
  max-width: 24em;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--c-iron-light);
}

.site-footer__status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--c-iron-light);
}

.site-footer__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-neon);
  box-shadow: 0 0 0 3px rgba(57, 255, 20, 0.15);
  flex-shrink: 0;
}

.site-footer__heading {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-cloud);
}

.site-footer__idx {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--c-neon);
}

.site-footer__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.35rem;
}

.site-footer__list li {
  display: flex;
  gap: 0.35rem;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--c-iron-light);
}

.site-footer__list a {
  color: var(--c-iron-light);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__list a:hover {
  color: var(--c-neon);
  padding-left: 4px;
  text-decoration: none;
}

.site-brand--footer .site-brand__mark {
  width: 2.2rem;
  height: 2.2rem;
  font-size: 0.9rem;
}

.site-brand--footer .site-brand__name {
  font-size: 1rem;
}

.site-footer__bottom {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 1rem var(--container-pad) 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 2rem;
}

.site-footer__copy,
.site-footer__icp,
.site-footer__addr {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--c-iron);
}

.site-footer__copy {
  color: var(--c-cloud);
}

@media (max-width: 1023px) {
  .site-header__island {
    border-radius: 20px;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: calc(100% + 0.75rem);
    left: 0;
    right: 0;
    margin: 0;
    padding: 0.75rem;
    background: rgba(10, 31, 60, 0.98);
    border: 1px solid rgba(74, 144, 217, 0.35);
    border-radius: 16px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.55);
  }

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

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
  }

  .site-nav__link {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.7rem 1rem;
    border-radius: 10px;
    font-size: 1rem;
  }

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

@media (max-width: 900px) {
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .site-footer__top {
    grid-template-columns: 1fr 1fr;
  }

  .site-footer__brand {
    grid-column: span 2;
  }
}

@media (max-width: 768px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .grid--main-aside {
    grid-template-columns: minmax(0, 1fr);
  }

  .col-span-3,
  .col-span-4,
  .col-span-6,
  .col-span-8,
  .col-span-9,
  .col-span-12 {
    grid-column: span 1;
  }
}

@media (max-width: 560px) {
  .site-footer__top {
    grid-template-columns: 1fr;
  }

  .site-footer__brand {
    grid-column: span 1;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }
}

@media (max-width: 480px) {
  .site-topbar__coord {
    display: none;
  }

  .site-brand__tagline {
    display: none;
  }

  .site-header__cta {
    display: none;
  }

  .site-header__island {
    gap: 0.5rem;
  }

  .site-header__inner {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
  }
}

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