:root {
  --c-bg: #0A0E17;
  --c-bg-panel: #121A2B;
  --c-purple: #A855F7;
  --c-cyan: #00E5FF;
  --c-orange: #FF6A00;
  --c-text: #EAF0FF;
  --c-text-dim: #8B9BB4;
  --c-success: #00FF88;
  --c-warning: #FFD166;
  --font-heading: "Orbitron", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-body: "Rajdhani", "Noto Sans SC", "PingFang SC", sans-serif;
  --container-w: 1400px;
  --header-slogan-h: 32px;
  --header-h: 76px;
  --header-total-h: calc(var(--header-slogan-h) + var(--header-h));
  --radius: 2px;
  --transition: 200ms ease;
}

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

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

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  color: var(--c-text);
  background:
    radial-gradient(1200px 600px at 85% -10%, rgba(168, 85, 247, 0.16), transparent 60%),
    radial-gradient(900px 460px at 5% 5%, rgba(0, 229, 255, 0.08), transparent 50%),
    var(--c-bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--c-text);
}

a {
  color: var(--c-cyan);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--c-text);
}

ul[class] {
  list-style: none;
}

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

::selection {
  background: rgba(168, 85, 247, 0.45);
  color: var(--c-text);
}

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

::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--c-bg);
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--c-purple), var(--c-cyan));
}

.main-content {
  padding-top: var(--header-total-h);
  min-height: 60vh;
}

.container {
  width: min(100% - 48px, var(--container-w));
  margin-inline: auto;
}

.site-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.col-span-3 { grid-column: span 3; }
.col-span-4 { grid-column: span 4; }
.col-span-5 { grid-column: span 5; }
.col-span-6 { grid-column: span 6; }
.col-span-7 { grid-column: span 7; }
.col-span-8 { grid-column: span 8; }
.col-span-9 { grid-column: span 9; }
.col-span-12 { grid-column: span 12; }

.section {
  padding: 72px 0;
  position: relative;
}

.section-head {
  max-width: 760px;
  margin-bottom: 32px;
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.section-head h2 {
  font-size: 32px;
  margin-top: 8px;
}

.section-head p {
  margin-top: 12px;
  font-size: 16px;
  color: var(--c-text-dim);
  max-width: 60ch;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  background: transparent;
  border: 1px solid rgba(168, 85, 247, 0.8);
  color: var(--c-text);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.btn:hover {
  background: rgba(168, 85, 247, 0.14);
  border-color: var(--c-cyan);
  color: #fff;
}

.btn-primary {
  background: var(--c-purple);
  border-color: var(--c-purple);
  color: #fff;
}

.btn-primary:hover {
  background: rgba(168, 85, 247, 0.2);
  border-color: var(--c-cyan);
  color: #fff;
}

.btn-ghost {
  border-color: rgba(0, 229, 255, 0.5);
}

.btn-ghost:hover {
  background: rgba(0, 229, 255, 0.1);
  border-color: var(--c-cyan);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  color: var(--c-text-dim);
  margin-bottom: 24px;
}

.breadcrumbs a {
  color: var(--c-cyan);
}

.breadcrumbs a:hover {
  color: #fff;
}

.breadcrumbs .crumb-current {
  color: var(--c-text);
}

.prose {
  max-width: 72ch;
  color: var(--c-text-dim);
  font-size: 16px;
  line-height: 1.8;
}

.prose h2 {
  font-size: 22px;
  margin: 32px 0 12px;
  color: var(--c-text);
}

.prose h3 {
  font-size: 18px;
  margin: 24px 0 8px;
  color: var(--c-text);
}

.prose p {
  margin-bottom: 16px;
}

.prose strong {
  color: var(--c-text);
}

.card {
  background: var(--c-bg-panel);
  border: 1px solid rgba(168, 85, 247, 0.18);
  padding: 24px;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

.card h3 {
  font-size: 18px;
  margin-bottom: 8px;
}

.card p {
  color: var(--c-text-dim);
  font-size: 15px;
}

.panel {
  background: linear-gradient(145deg, rgba(18, 26, 43, 0.92), rgba(10, 14, 23, 0.75));
  border: 1px solid rgba(168, 85, 247, 0.2);
  padding: 24px;
  position: relative;
}

.panel::before {
  content: "";
  position: absolute;
  inset: -1px;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.25), transparent 30%, rgba(0, 229, 255, 0.2));
  pointer-events: none;
}

.rule-line {
  height: 1px;
  border: none;
  background: linear-gradient(90deg, var(--c-purple), var(--c-cyan), transparent);
}

.image-shell {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(168, 85, 247, 0.14), rgba(0, 229, 255, 0.08));
  border: 1px solid rgba(168, 85, 247, 0.22);
}

.image-shell img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-shell--16\/9 { aspect-ratio: 16 / 9; }
.image-shell--4\/3 { aspect-ratio: 4 / 3; }
.image-shell--1\/1 { aspect-ratio: 1 / 1; }

.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 300;
  padding: 12px 20px;
  background: var(--c-cyan);
  color: var(--c-bg);
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  border-radius: 0 0 4px 4px;
}

.skip-link:focus-visible {
  top: 0;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  background: rgba(10, 14, 23, 0.74);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(168, 85, 247, 0.2);
  transition: background-color 250ms ease, border-color 250ms ease, box-shadow 250ms ease;
}

.site-header.is-scrolled {
  background: rgba(10, 14, 23, 0.97);
  border-bottom-color: rgba(0, 229, 255, 0.28);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
}

.scroll-progress {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  z-index: 5;
  background: linear-gradient(90deg, var(--c-purple), var(--c-cyan));
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.4);
  transition: width 100ms linear;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: var(--header-slogan-h);
  padding: 0 24px;
  background: rgba(10, 14, 23, 0.35);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 13px;
  line-height: 1.2;
  color: var(--c-text-dim);
  white-space: nowrap;
}

.slogan-text {
  color: rgba(168, 85, 247, 0.95);
  letter-spacing: 0.04em;
  overflow: hidden;
  text-overflow: ellipsis;
}

.slogan-refresh {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-success);
  box-shadow: 0 0 8px rgba(0, 255, 136, 0.7);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  width: min(100% - 48px, var(--container-w));
  margin-inline: auto;
  min-height: var(--header-h);
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--c-purple), var(--c-cyan));
  color: var(--c-bg);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -0.02em;
  clip-path: polygon(0 0, 88% 0, 100% 38%, 100% 100%, 12% 100%, 0 62%);
  flex-shrink: 0;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--c-text);
}

.brand-sub {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-text-dim);
}

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

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-list a {
  display: block;
  padding: 8px 14px;
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--c-text-dim);
  border-bottom: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.nav-list a:hover {
  color: var(--c-text);
  background: rgba(168, 85, 247, 0.08);
}

.nav-list a[aria-current="page"] {
  color: var(--c-text);
  border-bottom-color: var(--c-cyan);
  background: linear-gradient(180deg, rgba(0, 229, 255, 0.1), transparent);
}

.legacy-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-warning);
  background: rgba(255, 209, 102, 0.06);
  border: 1px solid rgba(255, 209, 102, 0.38);
  white-space: nowrap;
  flex-shrink: 0;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.legacy-link::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-warning);
  box-shadow: 0 0 6px rgba(255, 209, 102, 0.8);
}

.legacy-link:hover {
  background: rgba(255, 209, 102, 0.14);
  border-color: var(--c-warning);
  color: #fff;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background: transparent;
  border: 1px solid rgba(168, 85, 247, 0.4);
  cursor: pointer;
  flex-shrink: 0;
}

.toggle-bar {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--c-text);
  transition: transform var(--transition), opacity var(--transition);
}

.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 {
  position: relative;
  background: linear-gradient(180deg, var(--c-bg), #070B12);
  border-top: 1px solid rgba(168, 85, 247, 0.25);
  overflow: hidden;
  margin-top: 80px;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--c-purple), var(--c-cyan), transparent);
}

.footer-top {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 32px;
  width: min(100% - 48px, var(--container-w));
  margin-inline: auto;
  padding: 64px 0 48px;
}

.footer-brand-col {
  grid-column: span 5;
}

.footer-about {
  margin-top: 20px;
  color: var(--c-text-dim);
  font-size: 15px;
  line-height: 1.7;
}

.footer-contact {
  display: grid;
  gap: 6px;
  margin-top: 20px;
  font-size: 14px;
  color: var(--c-text-dim);
}

.footer-contact span {
  display: inline-block;
  min-width: 72px;
  color: var(--c-text);
  font-weight: 600;
}

.footer-links-wrap {
  grid-column: span 7;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.footer-nav-group h3 {
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-purple);
  border-bottom: 1px solid rgba(168, 85, 247, 0.22);
  padding-bottom: 10px;
  margin-bottom: 16px;
}

.footer-nav {
  display: grid;
  gap: 4px;
}

.footer-nav a {
  display: inline-block;
  padding: 4px 0;
  color: var(--c-text-dim);
  transition: color var(--transition), padding-left var(--transition);
}

.footer-nav a:hover {
  color: var(--c-text);
  padding-left: 8px;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: min(100% - 48px, var(--container-w));
  margin-inline: auto;
  padding: 20px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 13px;
  color: var(--c-text-dim);
}

.back-top {
  position: fixed;
  right: 28px;
  bottom: 30px;
  z-index: 100;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  background: var(--c-bg-panel);
  border: 1px solid rgba(0, 229, 255, 0.4);
  color: var(--c-cyan);
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 8px 100%, 0 calc(100% - 8px));
  transition: opacity var(--transition), background var(--transition), border-color var(--transition);
}

.back-top.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.back-top:hover {
  background: rgba(0, 229, 255, 0.1);
  border-color: var(--c-cyan);
}

@media (max-width: 1199px) {
  .nav-toggle {
    display: inline-flex;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 14, 23, 0.98);
    border-top: 1px solid rgba(168, 85, 247, 0.3);
    border-bottom: 1px solid rgba(0, 229, 255, 0.25);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: min(100% - 48px, var(--container-w));
    margin-inline: auto;
    padding: 16px 0;
  }

  .nav-list a {
    padding: 12px 16px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 0;
  }

  .nav-list a[aria-current="page"] {
    background: rgba(0, 229, 255, 0.08);
    border-bottom-color: rgba(0, 229, 255, 0.3);
  }

  .col-span-3,
  .col-span-4,
  .col-span-5 {
    grid-column: span 6;
  }

  .col-span-7,
  .col-span-8,
  .col-span-9 {
    grid-column: span 12;
  }
}

@media (max-width: 767px) {
  :root {
    --header-slogan-h: 28px;
    --header-h: 64px;
  }

  .header-top {
    padding: 0 16px;
    font-size: 12px;
  }

  .slogan-refresh {
    display: none;
  }

  .header-inner {
    gap: 10px;
    min-height: var(--header-h);
    width: min(100% - 32px, var(--container-w));
  }

  .brand {
    gap: 8px;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
    font-size: 13px;
  }

  .brand-name {
    font-size: 16px;
  }

  .brand-sub {
    font-size: 9px;
  }

  .legacy-link {
    margin-left: auto;
    padding: 7px 10px;
    font-size: 11px;
  }

  .nav-toggle {
    width: 40px;
    height: 40px;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 48px 0 36px;
  }

  .footer-brand-col,
  .footer-links-wrap {
    grid-column: span 1;
  }

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

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

  .back-top {
    right: 16px;
    bottom: 16px;
  }

  .site-grid {
    gap: 16px;
  }

  .col-span-3,
  .col-span-4,
  .col-span-5,
  .col-span-6,
  .col-span-7,
  .col-span-8,
  .col-span-9 {
    grid-column: span 12;
  }

  .section {
    padding: 48px 0;
  }

  .section-head h2 {
    font-size: 24px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}