:root {
  --bg: #080d17;
  --panel: #121925;
  --panel-2: #192232;
  --line: #2b3548;
  --text: #eef5ff;
  --muted: #aeb9ca;
  --blue: #0b5cff;
  --cyan: #26d8ff;
  --gold: #ffbf35;
  --gold-2: #ff9d28;
  --radius: 8px;
  --shadow: 0 22px 60px rgba(0, 0, 0, .38);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 85% 0%, rgba(17, 92, 255, .22), transparent 32rem),
    radial-gradient(circle at 10% 12%, rgba(38, 216, 255, .11), transparent 28rem),
    var(--bg);
  color: var(--text);
  font-family: Inter, Arial, Helvetica, sans-serif;
  line-height: 1.65;
}

a {
  color: inherit;
}

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

.container {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  background: rgba(8, 13, 23, .94);
  backdrop-filter: blur(14px);
}

.header-inner {
  width: min(1240px, calc(100% - 24px));
  min-height: 76px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 210px 1fr auto auto;
  align-items: center;
  gap: 18px;
}

.brand {
  display: flex;
  align-items: center;
  width: 190px;
  height: 56px;
  overflow: hidden;
  border-radius: var(--radius);
}

.brand img,
.footer-brand img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: left center;
}

.main-nav {
  display: flex;
  justify-content: center;
  gap: 8px;
}

.nav-link {
  padding: 10px 13px;
  border-radius: var(--radius);
  color: var(--muted);
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text);
  background: var(--panel-2);
}

.header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 16px;
  border-radius: var(--radius);
  color: var(--text);
  text-decoration: none;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0;
  line-height: 1;
  white-space: nowrap;
}

.btn-gold {
  color: #111722;
  background: linear-gradient(180deg, var(--gold), var(--gold-2));
  box-shadow: 0 8px 22px rgba(255, 174, 43, .25);
}

.btn-ghost {
  border: 2px solid rgba(255, 191, 53, .72);
  color: #ffe3a2;
  background: rgba(255, 191, 53, .05);
}

.menu-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.burger {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  place-items: center;
  background: var(--panel);
  cursor: pointer;
}

.burger span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 3px 0;
  background: var(--text);
}

.breadcrumbs {
  display: flex;
  gap: 8px;
  align-items: center;
  margin: 18px 0;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumbs a {
  color: #cbeaff;
  text-decoration: none;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 390px;
  border: 1px solid rgba(255, 255, 255, .09);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

.hero > img {
  width: 100%;
  height: 100%;
  min-height: 390px;
  object-fit: cover;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(4, 9, 18, .92) 0%, rgba(4, 9, 18, .64) 34%, rgba(4, 9, 18, .05) 68%),
    linear-gradient(0deg, rgba(4, 9, 18, .46), transparent 55%);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: min(650px, 100%);
  padding: clamp(24px, 5vw, 56px);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--gold);
  font-weight: 900;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(34px, 6vw, 68px);
  line-height: 1.02;
  letter-spacing: 0;
  text-shadow: 0 6px 22px rgba(0, 0, 0, .45);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.toc {
  margin: 22px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, #141d2b, #101722);
}

.toc summary {
  padding: 16px 18px;
  color: var(--text);
  font-weight: 900;
  cursor: pointer;
}

.toc ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 18px;
  margin: 0;
  padding: 0 18px 18px 36px;
}

.toc a {
  color: #cfebff;
  text-decoration: none;
}

.content {
  margin: 22px 0 54px;
  padding: clamp(18px, 4vw, 36px);
  border: 1px solid rgba(255, 255, 255, .08);
  border-radius: var(--radius);
  background: rgba(18, 25, 37, .92);
}

.content section + hr,
.content hr {
  display: none;
}

.content h2,
.content h3,
.content h4 {
  line-height: 1.2;
  letter-spacing: 0;
}

.content h2 {
  margin: 40px 0 18px;
  font-size: clamp(26px, 4vw, 38px);
}

.content h3 {
  margin: 30px 0 12px;
  color: #d8efff;
  font-size: 24px;
}

.content h4 {
  color: var(--gold);
}

.content p,
.content li {
  color: #d7deea;
}

.content a {
  color: #61d9ff;
  font-weight: 800;
}

.content ul,
.content ol {
  padding-left: 22px;
}

.content li + li {
  margin-top: 7px;
}

.table-wrap {
  overflow-x: auto;
  margin: 18px 0 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  background: #101722;
}

th,
td {
  padding: 13px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: #fff4cf;
  background: #1a2535;
}

tr:last-child td {
  border-bottom: 0;
}

.site-footer {
  border-top: 1px solid rgba(255, 255, 255, .08);
  background: #070b13;
}

.footer-inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 30px 0;
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 18px;
  align-items: center;
}

.footer-brand {
  display: block;
  width: 160px;
  height: 52px;
  overflow: hidden;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 12px;
}

.site-footer a {
  color: #dbe8ff;
  text-decoration: none;
  font-weight: 800;
}

.site-footer p {
  grid-column: 1 / -1;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 920px) {
  .header-inner {
    grid-template-columns: 170px 1fr auto;
    gap: 10px;
  }

  .brand {
    width: 160px;
  }

  .burger {
    display: grid;
    grid-column: 3;
  }

  .header-actions {
    grid-column: 2;
    justify-self: end;
  }

  .main-nav {
    position: absolute;
    top: 76px;
    left: 12px;
    right: 12px;
    display: none;
    flex-direction: column;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #101722;
    box-shadow: var(--shadow);
  }

  .menu-toggle:checked ~ .main-nav {
    display: flex;
  }

  .nav-link {
    padding: 13px 14px;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(100% - 20px, 1180px);
  }

  .header-inner {
    width: calc(100% - 16px);
    min-height: 70px;
    grid-template-columns: 128px 1fr 44px;
  }

  .brand {
    width: 128px;
    height: 44px;
  }

  .main-nav {
    top: 70px;
  }

  .header-actions {
    gap: 6px;
  }

  .header-actions .btn {
    min-height: 36px;
    padding: 8px 9px;
    font-size: 11px;
  }

  .hero {
    min-height: 520px;
  }

  .hero > img {
    min-height: 520px;
    object-position: 70% center;
  }

  .hero::after {
    background: linear-gradient(0deg, rgba(4, 9, 18, .96) 0%, rgba(4, 9, 18, .78) 58%, rgba(4, 9, 18, .24) 100%);
  }

  .hero-overlay {
    justify-content: flex-end;
    padding: 22px;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .toc ul {
    grid-template-columns: 1fr;
  }

  .content {
    padding: 18px;
  }

  .content h2 {
    margin-top: 30px;
  }

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

  .site-footer nav {
    justify-content: flex-start;
  }
}

@media (max-width: 360px) {
  .header-inner {
    width: calc(100% - 12px);
    grid-template-columns: 92px 1fr 36px;
    gap: 6px;
  }

  .brand {
    width: 92px;
    height: 38px;
  }

  .burger {
    width: 36px;
    height: 36px;
  }

  .burger span {
    width: 17px;
  }

  .header-actions {
    gap: 4px;
  }

  .header-actions .btn {
    min-height: 32px;
    padding: 7px 5px;
    font-size: 9px;
  }
}