:root {
  --bg: #0b0b0b;
  --surface: #151515;
  --card: #191919;
  --card-soft: #262626;
  --text: #f5f5f5;
  --muted: #b9b9b9;
  --border: rgba(255, 255, 255, 0.12);
  --primary: #ff9800;
  --secondary: #ffcc80;
  --success: #00d88a;
  --danger: #b3262a;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen, Ubuntu, Cantarell, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 85% 10%, rgba(255, 152, 0, 0.18), transparent 30%),
    radial-gradient(circle at 10% 85%, rgba(0, 150, 136, 0.16), transparent 34%),
    var(--bg);
}
a { color: var(--secondary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
.layout {
  width: min(1200px, calc(100% - 24px));
  margin: 0 auto;
  padding: 20px 0 64px;
}
.topbar { background: transparent; }
.topbar-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 11px;
  flex: 0 0 auto;
}
.brand-copy strong {
  display: block;
  font-size: 18px;
  line-height: 1.05;
}
.brand-copy span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  line-height: 1.25;
  margin-top: 2px;
}
.top-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-left: auto;
}
.top-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 9px 14px;
  background: rgba(255, 255, 255, 0.04);
  font-size: 14px;
  line-height: normal;
}
.top-links a:hover {
  border-color: rgba(255, 152, 0, 0.28);
  text-decoration: none;
}
.top-links a.active {
  border-color: rgba(255, 152, 0, 0.48);
  background: rgba(255, 152, 0, 0.16);
  color: var(--secondary);
}
.menu-toggle {
  display: none;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  border-radius: 999px;
  width: 42px;
  height: 36px;
  padding: 0;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background: var(--text);
  content: '';
}
.hamburger {
  position: relative;
}
.hamburger::before,
.hamburger::after {
  position: absolute;
  left: 0;
}
.hamburger::before {
  top: -6px;
}
.hamburger::after {
  top: 6px;
}
.page-grid {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 18px;
  margin-top: 18px;
}
.sidebar {
  position: sticky;
  top: 78px;
  align-self: start;
  border-right: 1px solid var(--border);
  padding: 4px 18px 4px 0;
}
.sidebar h2 {
  margin: 0 0 10px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--secondary);
}
.nav-list, .toc-list {
  display: grid;
  gap: 8px;
  padding: 0;
  margin: 0;
  list-style: none;
}
.nav-list a, .toc-list a {
  display: block;
  padding: 11px 12px;
  border-radius: 14px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
}
.nav-list a.active, .nav-list a:hover, .toc-list a:hover {
  background: rgba(255, 152, 0, 0.10);
  color: var(--text);
  border-color: rgba(255, 152, 0, 0.16);
  text-decoration: none;
}
.content {
  display: grid;
  gap: 18px;
}
.page-intro {
  padding: 10px 0 18px;
}
.eyebrow {
  display: inline-block;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255,152,0,0.12);
  color: var(--secondary);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.page-intro h1 {
  margin: 14px 0 10px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.05;
}
.page-intro p {
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}
.page-intro-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.page-intro-meta span {
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--card-soft);
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 13px;
}
.doc-block, .doc-section {
  border-bottom: 1px solid var(--border);
  padding: 4px 0 24px;
}
.doc-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.doc-block h2, .doc-section h2 {
  margin: 0 0 10px;
  font-size: 24px;
  line-height: 1.15;
}
.lead {
  color: var(--muted);
  font-size: 16px;
  margin: 0;
}
.callout {
  border-left: 4px solid var(--primary);
  background: rgba(255, 152, 0, 0.08);
  padding: 14px 16px;
  border-radius: 16px;
  margin-top: 16px;
}
.callout strong { color: var(--text); }
.steps, .mini-list {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
}
.shot {
  margin-top: 16px;
  border: 1px dashed rgba(255, 204, 128, 0.35);
  border-radius: 18px;
  padding: 12px;
  background: rgba(255,255,255,0.02);
}
.shot img {
  width: 100%;
  border-radius: 12px;
  background: #111;
}
.accordion {
  display: grid;
  gap: 12px;
}
.accordion-item {
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  background: transparent;
}
.accordion-header {
  width: 100%;
  text-align: left;
  background: transparent;
  color: var(--text);
  border: 0;
  padding: 16px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 17px;
  font-weight: 600;
  cursor: pointer;
  transition: color 180ms ease;
}
.accordion-header:hover {
  color: var(--secondary);
}
.accordion-header [data-icon] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--secondary);
  font-size: 28px;
  line-height: 1;
  transform: rotate(0deg);
  transform-origin: center;
  transition: transform 220ms ease, color 220ms ease;
}
.accordion-item.open .accordion-header [data-icon] {
  transform: rotate(90deg);
}
.accordion-panel {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  padding: 0;
  transition: max-height 260ms ease, opacity 220ms ease, padding 220ms ease;
}
.accordion-item.open .accordion-panel {
  opacity: 1;
  padding: 0 0 18px;
}
.accordion-panel p,
.accordion-panel li { color: var(--muted); font-size: 15px; }
.footer {
  text-align: center;
  color: var(--muted);
  font-size: 14px;
  padding-top: 8px;
}
.pager {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.pager a {
  flex: 1 1 220px;
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
  background: transparent;
}
.pager strong {
  display: block;
  color: var(--text);
  font-size: 16px;
}
.pager span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-top: 3px;
}
@media (max-width: 920px) {
  .topbar-inner { align-items: flex-start; flex-wrap: wrap; }
  .top-links { order: 3; width: 100%; margin-left: 0; }
  .page-grid { grid-template-columns: 1fr; }
  body.help-menu-open { overflow: hidden; }
  body.help-menu-open::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: 25;
    background: rgba(0, 0, 0, 0.62);
  }
  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 30;
    width: min(82vw, 320px);
    height: 100dvh;
    max-height: 100dvh;
    padding: 28px 18px;
    background: var(--bg);
    border-right: 1px solid var(--border);
    transform: translateX(-105%);
    transition: transform 260ms ease;
    overflow-y: auto;
  }
  .sidebar.open { transform: translateX(0); }
  .menu-toggle { display: inline-flex; }
}
@media (max-width: 720px) {
  .layout, .topbar-inner { width: min(100%, calc(100% - 32px)); }
  .page-intro, .doc-block, .doc-section { padding: 8px 0 22px; }
  .doc-grid { grid-template-columns: 1fr; }
  .page-intro p { font-size: 15px; }
  .doc-block h2, .doc-section h2 { font-size: 22px; }
  .accordion-header { font-size: 16px; }
}