:root{
  --brand:#0aa88f;
  --bg:#f5f7fb;
  --card-border:#e6eaf2;
  --muted:#6b778c;
  --sidebar-width: 320px;
  --topbar-height: 56px;
}

body{
  background: var(--bg);
  color:#1f2d3d;
  padding-top: var(--topbar-height);
  overflow-x: hidden;
}

.topbar{
  background: var(--brand);
  color:#fff;
  height: var(--topbar-height);
  z-index: 1050;
  padding: 0.35rem 0.9rem;
}

.topbar .navbar-brand{
  font-weight: 700;
  letter-spacing:.2px;
  color:#fff;
}

.topbar .navbar-brand:hover{
  color:#fff;
}

.topbar .nav-link,
.topbar .btn-link{
  color: rgba(255,255,255,.9);
}

.topbar .nav-link:hover,
.topbar .btn-link:hover{
  color:#fff;
  text-decoration:none;
}

.topbar .guide-back-btn{
  border: 1px solid rgba(255,255,255,.55);
  color: #fff;
  background: rgba(255,255,255,.08);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
}

.topbar .guide-back-btn:hover{
  color: #fff;
  background: rgba(255,255,255,.2);
}

.topbar .guide-back-btn:focus{
  box-shadow: 0 0 0 .2rem rgba(255,255,255,.22);
}

.app{
  min-height: calc(100vh - var(--topbar-height));
  display:flex;
  overflow-x: hidden;
}

.sidebar{
  width: var(--sidebar-width);
  background:#fff;
  border-right:1px solid var(--card-border);
  padding: 14px 0;
  position: sticky;
  top: var(--topbar-height);
  height: calc(100vh - var(--topbar-height));
  overflow:auto;
}

.sidebar .section-title{
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--muted);
  padding: 12px 18px 6px;
  margin: 0;
}

.tree-root,
.tree-root ul{
  list-style: none;
  margin: 0;
  padding: 0;
}

.tree-root ul{
  padding-left: 14px;
  border-left: 1px dashed #e3e8f2;
  margin-left: 9px;
}

.tree-item{
  margin: 0;
}

.tree-link{
  color:#223;
  display: block;
  padding: 7px 18px;
  text-decoration: none;
  border-left: 3px solid transparent;
  line-height: 1.35;
  font-size: 13px;
}

.tree-link.level-1{
  font-weight: 600;
}

.tree-link.level-2{
  font-weight: 500;
}

.tree-link:hover{
  background:#f6f9ff;
  color:#223;
  text-decoration:none;
}

.tree-link.active{
  border-left-color: var(--brand);
  background:#f2fbf9;
  font-weight: 700;
}

.content{
  flex:1;
  padding: 22px 22px 40px;
  min-width: 0;
}

.page-card{
  background:#fff;
  border:1px solid var(--card-border);
  border-radius: 6px;
  box-shadow: 0 1px 0 rgba(0,0,0,.02);
  overflow: hidden;
}

.page-inner{
  padding: 22px;
}

.page-title{
  font-size: 24px;
  font-weight: 700;
  margin: 0;
}

.page-sub{
  color: var(--muted);
  margin-top: 6px;
  margin-bottom: 10px;
}

.doc-content h1,
.doc-content h2,
.doc-content h3,
.doc-content h4,
.doc-content h5,
.doc-content h6{
  margin-top: 1.5rem;
  margin-bottom: .7rem;
  scroll-margin-top: 74px;
}

.doc-content p{
  line-height: 1.62;
}

.doc-content{
  overflow-wrap: anywhere;
}

.doc-content img{
  max-width: 100%;
  height: auto;
  border: 1px solid #e6eaf2;
  border-radius: 4px;
  margin: .6rem 0;
}

.doc-content table{
  width: 100%;
  border-collapse: collapse;
  margin: .8rem 0;
  font-size: 13px;
  display: block;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.doc-content th,
.doc-content td{
  border: 1px solid #e6eaf2;
  padding: 8px 10px;
  vertical-align: top;
}

.doc-content th{
  background: #f7f9fd;
}

.doc-content code{
  background: #f4f6fb;
  border: 1px solid #e1e6f0;
  border-radius: 3px;
  padding: 1px 4px;
}

.doc-content pre code{
  display: block;
  padding: 10px;
  overflow: auto;
}

.doc-loading,
.doc-error{
  border-radius: 6px;
  border: 1px solid var(--card-border);
  padding: 14px;
}

.doc-loading{
  background: #f8fbff;
  color: #324055;
}

.doc-error{
  background: #fff5f5;
  color: #8d2831;
  border-color: #f2c4c8;
}

.footer{
  color: var(--muted);
  font-size: 12px;
  margin-top: 18px;
}

@media (max-width: 991.98px){
  .sidebar{
    position: fixed;
    left: 0;
    width: min(88vw, 340px);
    transform: translateX(-105%);
    top: var(--topbar-height);
    height: calc(100vh - var(--topbar-height));
    z-index: 1040;
    transition: transform .2s ease;
    box-shadow: 0 10px 30px rgba(0,0,0,.15);
  }

  .sidebar.open{
    transform: translateX(0);
  }

  .content{
    padding: 16px;
  }

  .topbar .navbar-brand{
    font-size: 1rem;
    max-width: calc(100% - 140px);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .backdrop{
    display:none;
    position: fixed;
    top: var(--topbar-height);
    left:0;
    right:0;
    bottom:0;
    background: rgba(0,0,0,.25);
    z-index: 1030;
  }

  .backdrop.show{
    display:block;
  }
}

@media (max-width: 767.98px){
  :root{
    --topbar-height: 52px;
  }

  .topbar{
    padding: 0.3rem 0.55rem;
  }

  .topbar .guide-back-btn{
    padding: 3px 10px;
    font-size: 11px;
  }

  .page-inner{
    padding: 16px;
  }

  .page-title{
    font-size: 21px;
    line-height: 1.25;
  }

  .doc-content th,
  .doc-content td{
    padding: 6px 8px;
    font-size: 12px;
  }
}