:root{--brand:#003761;--brand2:#005578;--accent:#d62828;--ink:#0f172a;--muted:#64748b;--bg:#f8fafc;--panel:#fff;--border:#e2e8f0}
*{box-sizing:border-box}body{margin:0;font-family:'Segoe UI',system-ui,Arial,sans-serif;background:var(--bg);color:#0f172a}
.site-header{position:sticky;top:0;z-index:10;background:linear-gradient(90deg,var(--brand),var(--brand2));color:#fff;padding:.6rem 1rem;display:flex;align-items:center;gap:1rem;justify-content:space-between}
.brand{display:flex;align-items:center;gap:.6rem}.logo-sw{height:34px}.logo-app{height:38px}.divider{width:1px;height:28px;background:rgba(255,255,255,.35);margin:0 .25rem}
.actions{display:flex;gap:.4rem}.btn{display:inline-flex;align-items:center;gap:.35rem;padding:.45rem .6rem;border-radius:.55rem;border:1px solid rgba(255,255,255,.4);background:rgba(255,255,255,.12);color:#fff;text-decoration:none;cursor:pointer}.btn:hover{background:rgba(255,255,255,.18)}.btn svg{width:16px;height:16px;fill:currentColor}
.container{display:grid;grid-template-columns:300px 1fr;gap:1rem;align-items:start;padding:1rem}
.sidebar{position:sticky;top:64px;max-height:calc(100vh - 80px);overflow:auto;background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:1rem}
.sidebar h3{margin:.25rem 0 1rem 0;color:#64748b;font-weight:600;font-size:.95rem}
.nav-tree{display:flex;flex-direction:column;gap:.35rem}
.nav-tree .tree-link{padding:.4rem .5rem;border-radius:.6rem;text-decoration:none;color:#0f172a;border:1px solid var(--border)}
.nav-tree .tree-link:hover{background:#f1f5f9}
#treeCommands>summary{font-weight:700;color:var(--brand)}
.tree-branch{border:1px solid var(--border);border-radius:10px;background:#fff}
.tree-branch>summary{list-style:none;padding:.55rem .7rem;cursor:pointer}
.tree-leaves{list-style:none;margin:0;padding:.35rem .6rem .7rem 1rem}
.tree-leaves li{margin:.15rem 0}
.tree-leaves a{display:block;padding:.2rem .25rem;border-radius:6px;color:#0f172a;text-decoration:none}
.tree-leaves a:hover{background:#f1f5f9}
.card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:1rem 1.25rem;margin-bottom:1rem}.hidden{display:none}
.card h2{color:#003761;margin-top:.25rem}.meta{color:#64748b;font-size:.9rem;margin-top:-.4rem;margin-bottom:.6rem}
.tabs{margin:.5rem 0 1rem}.tabs-bar{display:flex;gap:.5rem;border-bottom:2px solid var(--border)}.tab-btn{appearance:none;border:none;background:#fff;border:1px solid var(--border);border-bottom:none;padding:.45rem .75rem;border-top-left-radius:.6rem;border-top-right-radius:.6rem;color:#0f172a;cursor:pointer}.tab-btn.active{background:#f8fafc;font-weight:600;color:#d62828;border-color:#d62828}
.video-box{border:1px solid var(--border);border-radius:14px;overflow:hidden;background:#000}
.video-box video{display:block;width:100%;height:auto;background:#000}
.video-fallback{padding:1rem;color:#94a3b8;background:#0b1220;text-align:center}

.lang{position:absolute;right:14px;top:10px;display:flex;gap:.35rem}
.lang .btn-lang{border:1px solid rgba(255,255,255,.5);background:rgba(255,255,255,.15);color:#fff;border-radius:.5rem;padding:.25rem .5rem;cursor:pointer}
.lang .btn-lang.active{background:#fff;color:#003761;font-weight:700}
.site-header{position:sticky;top:0}

/* v12 header layout fix */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.lang {
  position: static;
  display: flex;
  gap: .35rem;
  margin-left: auto;
  margin-right: .5rem;
}
.lang .btn-lang {
  border: 1px solid rgba(255,255,255,.5);
  background: rgba(255,255,255,.15);
  color: #fff;
  border-radius: .5rem;
  padding: .25rem .5rem;
  cursor: pointer;
}
.lang .btn-lang.active {
  background: #fff;
  color: #003761;
  font-weight: 700;
}
.actions {
  display: flex;
  gap: .4rem;
}