:root {
  --bg: #071019;
  --panel: #0e1624;
  --sidebar: #0b1320;
  --border: #1c2636;
  --text: #eaf2ff;
  --muted: #b3bfd2;
  --accent: #3dd5f3;
  --accent-2: #7cf3c5;
  --body-strong: #f6fbff;
  --radius: 14px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Space Grotesk", "Segoe UI", system-ui, -apple-system, sans-serif;
  background: radial-gradient(circle at 12% 18%, rgba(61, 213, 243, 0.09), transparent 24%),
              radial-gradient(circle at 88% 10%, rgba(124, 243, 197, 0.12), transparent 22%),
              var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.top-banner {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 12px 16px;
  background: linear-gradient(135deg, rgba(61, 213, 243, 0.18), rgba(124, 243, 197, 0.18));
  color: var(--body-strong);
  border-bottom: 1px solid rgba(61, 213, 243, 0.35);
  backdrop-filter: blur(6px);
}

.top-banner__link {
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid rgba(61, 213, 243, 0.6);
  background: rgba(14, 22, 36, 0.7);
  color: var(--body-strong);
  font-weight: 700;
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
}

.top-banner__link:hover {
  background: rgba(61, 213, 243, 0.2);
  border-color: rgba(124, 243, 197, 0.6);
}

.top-banner__link:active { transform: translateY(1px); }

.app {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 300px;
  background: var(--sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  max-height: 100vh;
  overflow: hidden;
  box-shadow: 8px 0 24px rgba(0, 0, 0, 0.25);
  z-index: 10;
}

.sidebar-header {
  padding: 20px 18px 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}

.brand {
  font-weight: 700;
  letter-spacing: 0.6px;
  font-size: 19px;
}

.brand-sub {
  width: 100%;
}

.return-game {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 10px;
  border: 1px solid rgba(61, 213, 243, 0.6);
  background: rgba(61, 213, 243, 0.12);
  color: var(--body-strong);
  font-weight: 700;
  font-size: 13px;
  text-decoration: none;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.1s ease;
}

.return-game:hover {
  background: rgba(61, 213, 243, 0.2);
  border-color: rgba(124, 243, 197, 0.8);
}

.return-game:active { transform: translateY(1px); }

.sidebar-search {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-search input {
  width: 100%;
  padding: 11px 12px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.sidebar-search input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(61, 213, 243, 0.2);
}

.menu {
  flex: 1;
  overflow-y: auto;
  padding: 8px 10px 10px;
}

.menu-item {
  width: 100%;
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text);
  font-size: 15px;
  text-align: left;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.menu-item:hover {
  background: rgba(61, 213, 243, 0.08);
  border-color: var(--border);
}

.menu-item:active { transform: translateY(1px); }

.menu-item.parent { font-weight: 700; }

.menu-item.active {
  background: linear-gradient(135deg, rgba(61, 213, 243, 0.16), rgba(124, 243, 197, 0.12));
  border-color: rgba(61, 213, 243, 0.6);
  box-shadow: 0 12px 28px rgba(61, 213, 243, 0.16);
}

.menu-item .label {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.menu-item .caret {
  width: 9px;
  height: 9px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(45deg);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.menu-item.open .caret {
  transform: rotate(225deg);
  border-color: var(--accent);
}

.submenu {
  margin-left: 12px;
  border-left: 1px dashed var(--border);
  padding-left: 6px;
  display: none;
}

.submenu.open { display: block; }

.menu-empty {
  color: var(--muted);
  font-size: 14px;
  padding: 10px 12px;
}

.content {
  flex: 1;
  min-height: 100vh;
  background: linear-gradient(135deg, rgba(61, 213, 243, 0.04), rgba(124, 243, 197, 0.03));
  padding: 18px 20px 48px;
}

.content-inner {
  max-width: 1100px;
  margin: 0 auto;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 30px 26px 38px;
}

.content-meta {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.breadcrumbs {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.3px;
}

h1 { margin: 0 0 14px; font-size: 28px; letter-spacing: 0.3px; color: var(--body-strong); }
h2 { margin: 24px 0 12px; font-size: 21px; color: var(--body-strong); }
h3 { margin: 18px 0 10px; font-size: 17px; color: var(--text); }
p { margin: 0 0 14px; color: var(--text); line-height: 1.68; }
ul { margin: 0 0 14px 18px; color: var(--text); line-height: 1.65; padding: 0; }
code {
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 6px;
  border-radius: 8px;
  border: 1px solid var(--border);
  font-size: 14px;
}
pre code {
  display: block;
  padding: 12px;
  overflow-x: auto;
}
.muted { color: var(--muted); }

.page-body {
  color: var(--text);
  line-height: 1.7;
}
.page-body a { color: var(--accent-2); }
.page-body strong { color: var(--body-strong); }

.nav-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin: 2px 0 20px;
  flex-wrap: wrap;
}

.nav-btn {
  flex: 1;
  min-width: 160px;
  display: inline-flex;
  justify-content: center;
  gap: 8px;
  align-items: center;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid rgba(61, 213, 243, 0.5);
  background: rgba(61, 213, 243, 0.12);
  color: var(--text);
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.1s ease, opacity 0.2s ease;
}

.nav-btn:hover { background: rgba(61, 213, 243, 0.18); border-color: rgba(61, 213, 243, 0.7); }
.nav-btn:active { transform: translateY(1px); }
.nav-btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }

.example-block {
  margin-top: 28px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(11, 19, 32, 0.9);
  box-shadow: var(--shadow);
}

.example-header {
  padding: 12px 16px;
  font-weight: 700;
  color: #e8f7ff;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(61, 213, 243, 0.2), rgba(11, 19, 32, 0.95));
}

.iframe-wrapper { padding: 12px; }

iframe {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #0b1220;
}

.hidden { display: none; }

.sidebar-toggle {
  display: none;
  width: 100%;
  border: none;
  background: rgba(11, 19, 32, 0.95);
  color: var(--text);
  padding: 14px 18px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.sidebar-toggle:active { transform: translateY(1px); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 960px) {
  .app { flex-direction: column; }
  .sidebar { position: relative; width: 100%; max-height: 70vh; display: none; box-shadow: none; }
  body.sidebar-open .sidebar { display: flex; }
  .sidebar-toggle {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    justify-content: flex-start;
    background: linear-gradient(135deg, rgba(61, 213, 243, 0.1), rgba(11, 19, 32, 0.95));
  }
  .content { padding: 12px 12px 40px; }
  .content-inner { padding: 22px 18px 28px; }
}