:root {
  --color-bg: #0A0E17;
  --color-panel: #121A2B;
  --color-panel-deep: #0D1422;
  --color-neon: #00D4FF;
  --color-orange: #FF7A00;
  --color-text: #EAF6FF;
  --color-muted: #9AA8BF;
  --color-border: rgba(0, 212, 255, 0.45);
  --gradient-action: linear-gradient(135deg, #00D4FF 0%, #FF7A00 100%);
  --font-display: 'Rajdhani', 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --content-max: 1240px;
  --header-h: 72px;
  --radius: 14px;
  --ease: 180ms ease;
  --shadow-neon: 0 0 24px rgba(0, 212, 255, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 12px);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 80% 15%, rgba(0, 212, 255, 0.12), transparent 34rem),
    radial-gradient(circle at 8% 85%, rgba(255, 122, 0, 0.08), transparent 28rem),
    var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  word-break: break-word;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
}

a {
  color: var(--color-neon);
  text-decoration: none;
  transition: color var(--ease), text-shadow var(--ease);
}

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

button {
  font: inherit;
}

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

:focus-visible {
  outline: 2px solid var(--color-neon);
  outline-offset: 3px;
  border-radius: 4px;
}

[id="main-content"] {
  scroll-margin-top: calc(var(--header-h) + 12px);
}

::selection {
  background: var(--color-neon);
  color: #0A0E17;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 1rem;
  z-index: 90;
  transform: translateY(-220%);
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.25rem;
  background: var(--gradient-action);
  color: #0A0E17;
  border-radius: 0 0 10px 10px;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: transform var(--ease);
}

.skip-link:hover {
  color: #0A0E17;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(10, 14, 23, 0.82);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(0, 212, 255, 0.28);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.site-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 3;
  background: var(--gradient-action);
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.6);
  transform-origin: 0% 50%;
  transform: scaleX(var(--progress, 0));
  pointer-events: none;
}

.header-inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0 clamp(1rem, 3vw, 2rem);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  flex-shrink: 0;
  color: var(--color-text);
}

.brand:hover {
  color: var(--color-text);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(0, 212, 255, 0.75);
  border-radius: 6px;
  color: var(--color-neon);
  background: rgba(0, 212, 255, 0.08);
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  box-shadow: 0 0 14px rgba(0, 212, 255, 0.45), inset 0 0 10px rgba(0, 212, 255, 0.12);
  transition: border-color var(--ease), color var(--ease), box-shadow var(--ease);
}

.brand:hover .brand-mark {
  border-color: var(--color-orange);
  color: var(--color-orange);
  box-shadow: 0 0 16px rgba(255, 122, 0, 0.4), inset 0 0 10px rgba(255, 122, 0, 0.15);
}

.brand-text {
  display: flex;
  flex-direction: column;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.18rem;
  letter-spacing: 0.14em;
  line-height: 1;
  color: var(--color-text);
  text-transform: uppercase;
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.45);
  transition: text-shadow var(--ease);
}

.brand:hover .brand-text {
  text-shadow: 0 0 14px rgba(255, 122, 0, 0.5);
}

.brand-text small {
  margin-top: 0.28rem;
  font-size: 0.58rem;
  letter-spacing: 0.42em;
  color: var(--color-muted);
  font-weight: 500;
  text-shadow: none;
}

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 0.55rem 0.8rem;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  line-height: 1.2;
  white-space: nowrap;
  transition: color var(--ease), border-color var(--ease), background var(--ease), box-shadow var(--ease), text-shadow var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 0;
  height: 2px;
  background: var(--gradient-action);
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
  transition: width var(--ease), left var(--ease);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-neon);
  background: rgba(0, 212, 255, 0.06);
  border-color: rgba(0, 212, 255, 0.3);
  box-shadow: inset 0 0 18px rgba(0, 212, 255, 0.06), 0 0 16px rgba(0, 212, 255, 0.12);
  text-shadow: 0 0 8px rgba(0, 212, 255, 0.75);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  left: 12%;
  width: 76%;
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: 0.25rem;
  flex-shrink: 0;
}

.search-icon {
  display: grid;
  place-items: center;
  position: relative;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(0, 212, 255, 0.28);
  border-radius: 50%;
  background: rgba(0, 212, 255, 0.04);
  color: var(--color-neon);
  cursor: default;
  transition: border-color var(--ease), box-shadow var(--ease), background var(--ease);
}

.search-icon::before {
  content: "";
  width: 11px;
  height: 11px;
  border: 2px solid currentColor;
  border-radius: 50%;
  margin-right: -5px;
}

.search-icon::after {
  content: "";
  position: absolute;
  right: 10px;
  bottom: 12px;
  width: 7px;
  height: 2px;
  background: currentColor;
  transform: rotate(45deg);
  border-radius: 2px;
}

.search-icon:hover {
  border-color: var(--color-orange);
  color: var(--color-orange);
  box-shadow: 0 0 14px rgba(255, 122, 0, 0.28);
  background: rgba(255, 122, 0, 0.06);
}

.nav-toggle {
  display: none;
  position: relative;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: var(--color-panel);
  border: 1px solid rgba(0, 212, 255, 0.35);
  border-radius: 8px;
  cursor: pointer;
  color: var(--color-neon);
}

.toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  box-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
  transition: transform var(--ease), opacity var(--ease);
}

.toggle-bar + .toggle-bar {
  margin-top: 5px;
}

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

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

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

.site-footer {
  background: linear-gradient(180deg, var(--color-bg) 0%, #060A12 100%);
  border-top: 1px solid rgba(0, 212, 255, 0.18);
  color: var(--color-muted);
}

.footer-glow {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--color-neon), var(--color-orange), transparent);
  filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.8));
}

.footer-inner {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 5rem) clamp(1rem, 3vw, 2rem) 2rem;
  display: grid;
  grid-template-columns: minmax(280px, 1.1fr) minmax(0, 2fr);
  gap: clamp(2rem, 4vw, 4rem);
  align-items: start;
}

.footer-brand-block {
  max-width: 400px;
}

.brand--footer {
  margin-bottom: 1.25rem;
}

.brand--footer .brand-mark {
  width: 44px;
  height: 44px;
}

.brand--footer .brand-text {
  font-size: 1.3rem;
}

.footer-trust {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-muted);
  border-left: 2px solid var(--color-neon);
  padding-left: 1rem;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

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

.footer-heading {
  margin: 0 0 0.9rem;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-neon);
  text-shadow: 0 0 10px rgba(0, 212, 255, 0.35);
}

.footer-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.footer-list a {
  display: inline-block;
  position: relative;
  color: var(--color-muted);
  padding-left: 0;
  transition: color var(--ease), text-shadow var(--ease), padding-left var(--ease);
}

.footer-list a::before {
  content: "→";
  position: absolute;
  left: -1.2rem;
  color: var(--color-neon);
  opacity: 0;
  transition: left var(--ease), opacity var(--ease);
}

.footer-list a:hover {
  color: var(--color-neon);
  padding-left: 0.25rem;
  text-shadow: 0 0 8px rgba(0, 212, 255, 0.4);
}

.footer-list a:hover::before {
  left: -0.8rem;
  opacity: 1;
}

.footer-meta {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding-top: 1.5rem;
  margin-top: clamp(1.5rem, 4vw, 3rem);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  align-items: center;
  font-size: 0.9rem;
}

.footer-contact,
.footer-address,
.footer-icp,
.footer-copy {
  margin: 0;
  color: var(--color-muted);
}

.footer-contact::before {
  content: "✉";
  color: var(--color-orange);
  margin-right: 0.4rem;
}

.footer-copy {
  margin-left: auto;
}

.content-shell {
  width: min(calc(100% - 2rem), var(--content-max));
  margin-inline: auto;
}

.section {
  padding-block: clamp(3.5rem, 8vw, 7rem);
}

.section--tight {
  padding-block: clamp(2rem, 5vw, 3.5rem);
}

.page-header {
  padding: clamp(3rem, 8vw, 6rem) 0 2rem;
}

.eyebrow {
  margin: 0 0 0.6rem;
  color: var(--color-neon);
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

.page-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-shadow: 0 0 16px rgba(0, 212, 255, 0.4);
}

.section-title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 3.5vw, 2.5rem);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  text-shadow: 0 0 12px rgba(0, 212, 255, 0.25);
}

.section-intro,
.lead {
  margin: 0;
  max-width: 42em;
  color: var(--color-muted);
  font-size: 1.05rem;
}

.split-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
  padding-block: clamp(3rem, 7vw, 6rem);
}

.split-hero__content {
  display: grid;
  gap: 1.25rem;
  justify-items: start;
}

.split-hero__visual {
  position: relative;
  min-height: 360px;
}

.topic-strip {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(min(76vw, 360px), 1fr);
  gap: 1rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  scroll-snap-type: x proximity;
}

.topic-strip > * {
  scroll-snap-align: start;
}

.grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 1.75rem);
}

.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));
}

.glass-panel {
  background: rgba(18, 26, 43, 0.72);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: var(--radius);
  padding: clamp(1.25rem, 3vw, 2.5rem);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.3), inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.75rem 1.3rem;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color var(--ease), background var(--ease), border-color var(--ease), box-shadow var(--ease), filter var(--ease);
}

.btn--primary {
  background: var(--gradient-action);
  color: #0A0E17;
  box-shadow: 0 0 18px rgba(0, 212, 255, 0.25);
}

.btn--primary:hover {
  color: #0A0E17;
  filter: brightness(1.08);
  box-shadow: 0 0 28px rgba(255, 122, 0, 0.35);
}

.btn--primary:active {
  filter: brightness(0.85) saturate(1.4);
}

.btn--ghost {
  border-color: rgba(0, 212, 255, 0.5);
  color: var(--color-neon);
  background: rgba(0, 212, 255, 0.04);
}

.btn--ghost:hover {
  color: #0A0E17;
  background: var(--color-neon);
  border-color: var(--color-neon);
  box-shadow: 0 0 22px rgba(0, 212, 255, 0.35);
}

.btn--ghost:active {
  background: var(--color-orange);
  border-color: var(--color-orange);
  color: #0A0E17;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.8rem;
  border: 1px solid rgba(0, 212, 255, 0.45);
  border-radius: 999px;
  color: var(--color-neon);
  background: rgba(0, 212, 255, 0.06);
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.chip--hot {
  border-color: rgba(255, 122, 0, 0.55);
  color: var(--color-orange);
  background: rgba(255, 122, 0, 0.08);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
  font-size: 0.9rem;
  color: var(--color-muted);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 0.45rem;
  color: var(--color-muted);
  opacity: 0.6;
}

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

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

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

.media-frame {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: var(--aspect, 16 / 10);
  min-height: 120px;
  overflow: hidden;
  background: linear-gradient(140deg, rgba(0, 212, 255, 0.08), rgba(255, 122, 0, 0.05) 60%, rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(0, 212, 255, 0.22);
  border-radius: var(--radius);
  color: var(--color-muted);
  text-align: center;
  font-family: var(--font-display);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.75rem;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(90deg, rgba(0, 212, 255, 0.08) 0 1px, transparent 1px 8px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.02) 0 1px, transparent 1px 8px);
  pointer-events: none;
}

.media-frame::after {
  content: attr(data-label);
  position: relative;
  z-index: 1;
  padding: 0 1rem;
  text-shadow: 0 0 12px rgba(0, 0, 0, 0.6);
}

.tabs {
  border: 1px solid rgba(0, 212, 255, 0.3);
  background: rgba(18, 26, 43, 0.72);
  border-radius: var(--radius);
  overflow: hidden;
}

.tabs-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
  padding: 0.5rem;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid rgba(0, 212, 255, 0.2);
}

.tab-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.55rem 1rem;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--color-muted);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color var(--ease), border-color var(--ease), background var(--ease), box-shadow var(--ease);
}

.tab-button:hover {
  color: var(--color-neon);
  border-color: rgba(0, 212, 255, 0.35);
}

.tab-button[aria-selected="true"] {
  color: var(--color-text);
  background: rgba(0, 212, 255, 0.14);
  border-color: rgba(0, 212, 255, 0.55);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.2);
  text-shadow: 0 0 8px rgba(0, 212, 255, 0.6);
}

.tabs-panel {
  padding: clamp(1.25rem, 3vw, 2rem);
  color: var(--color-text);
}

@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr;
  }

  .footer-brand-block {
    max-width: none;
  }

  .footer-meta {
    grid-column: 1;
  }
}

@media (max-width: 960px) {
  :root {
    --header-h: 64px;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    margin-left: 0;
    background: rgba(10, 14, 23, 0.97);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem;
  }

  .nav-link,
  .nav-link[aria-current="page"] {
    display: block;
    padding: 0.8rem 0.9rem;
    border: 0;
    border-bottom: 1px solid rgba(0, 212, 255, 0.12);
    border-radius: 0;
    background: transparent;
    text-align: left;
    white-space: normal;
    box-shadow: none;
  }

  .nav-link:hover,
  .nav-link[aria-current="page"] {
    border-bottom-color: var(--color-orange);
    background: rgba(0, 212, 255, 0.05);
    box-shadow: none;
  }

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

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

  .header-actions {
    gap: 0.5rem;
  }

  .search-icon {
    width: 36px;
    height: 36px;
  }

  .split-hero {
    grid-template-columns: 1fr;
  }

  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  .footer-nav {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .footer-column {
    padding-bottom: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .footer-copy {
    margin-left: 0;
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  .topic-strip {
    grid-auto-columns: minmax(82vw, 1fr);
  }
}

@media (max-width: 520px) {
  .brand-text {
    font-size: 1rem;
  }

  .brand-text small {
    letter-spacing: 0.16em;
  }

  .header-inner {
    gap: 0.5rem;
  }
}

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