/* Reddit-style Blogger 3-column layout — v1.0.0 */
:root{
  --rd3-max:        1360px;
  --rd3-left-w:     250px;
  --rd3-right-w:    280px;
  --rd3-gap:        20px;
  --rd3-pad:        16px;
  --rd3-border:     rgba(0,0,0,.10);
  --rd3-text:       inherit;
  --rd3-muted:      #6B7280;
  --rd3-hover:      rgba(0,0,0,.05);
  --rd3-active:     rgba(0,0,0,.08);
  --rd3-radius:     10px;
}

/* ===== 3열 그리드 ===== */
body.rd3-layout .main_content_container{
  display:grid !important;
  grid-template-columns:var(--rd3-left-w) minmax(0,1fr) var(--rd3-right-w);
  gap:var(--rd3-gap);
  align-items:start;
  max-width:var(--rd3-max) !important;
  width:100% !important;
  margin:0 auto !important;
  padding:0 var(--rd3-pad) !important;
  box-sizing:border-box;
}
body.rd3-layout .main_content_container > .page{
  grid-column:2;
  float:none !important;
  width:100% !important;
  max-width:none !important;
  margin:0 !important;
}
body.rd3-layout .main_content_container > .rd3-left{
  grid-column:1;
  min-width:0;
}
body.rd3-layout .main_content_container > .sidebar-container{
  grid-column:3;
  min-width:0;
}
body.rd3-layout .page_body,
body.rd3-layout .centered,
body.rd3-layout main#main{
  max-width:none !important;
  width:100% !important;
  margin:0 !important;
}
body.rd3-layout .Blog{padding-left:0 !important}

/* 테마의 사이드바 오버레이/햄버거는 3열에서는 사용하지 않음 */
body.rd3-layout .hamburger-section,
body.rd3-layout .dim-overlay{display:none !important}
body.rd3-layout.sidebar-visible{overflow:auto !important}

/* ===== 좌측 레일 ===== */
.rd3-left{
  position:sticky;
  top:16px;
  align-self:start;
  font-family:inherit;
  color:var(--rd3-text);
  z-index:2;
}
.rd3-left-inner{
  padding:4px 14px 14px 0;
  border-right:1px solid var(--rd3-border);
}
.rd3-title{
  display:flex;
  align-items:center;
  gap:7px;
  margin:0 0 8px;
  padding:0 10px;
  font-size:11px;
  font-weight:700;
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--rd3-muted);
}
.rd3-title:before{
  content:"";
  width:7px;
  height:7px;
  border-radius:50%;
  background:#FF4500;
  flex:0 0 auto;
}
.rd3-nav{
  display:flex;
  flex-direction:column;
  gap:2px;
}
.rd3-link{
  display:flex;
  align-items:center;
  gap:11px;
  min-height:40px;
  padding:0 10px;
  border-radius:var(--rd3-radius);
  color:var(--rd3-text) !important;
  text-decoration:none !important;
  font-size:14px;
  font-weight:500;
  line-height:1.25;
  transition:background-color .14s ease;
}
.rd3-link:hover{background:var(--rd3-hover)}
.rd3-link.is-active{
  background:var(--rd3-active);
  font-weight:600;
}
.rd3-ico{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:20px;
  height:20px;
  flex:0 0 auto;
  color:currentColor;
  opacity:.9;
}
.rd3-ico svg{width:20px;height:20px;display:block}
.rd3-label{
  min-width:0;
  overflow:hidden;
  text-overflow:ellipsis;
  white-space:nowrap;
}
.rd3-left-slot{min-height:1px}
.rd3-left-slot:not(:empty){margin-top:14px}

/* ===== 우측 사이드바: 오버레이 → 그리드 컬럼 ===== */
body.rd3-layout .sidebar-container,
body.rd3-layout .sidebar-container.sidebar-invisible{
  display:block !important;
  position:sticky !important;
  top:16px !important;
  left:auto !important;
  right:auto !important;
  bottom:auto !important;
  width:auto !important;
  max-width:none !important;
  height:auto !important;
  max-height:calc(100vh - 32px);
  transform:none !important;
  transition:none !important;
  visibility:visible !important;
  opacity:1 !important;
  z-index:2 !important;
  background:transparent !important;
  overflow-y:auto !important;
  padding:4px 0 14px 16px !important;
  border-left:1px solid var(--rd3-border);
  box-sizing:border-box;
}
body.rd3-layout .sidebar-container .navigation{display:none !important}
body.rd3-layout .sidebar-container .widget{
  margin:0 !important;
  padding:14px 0 !important;
  background:transparent !important;
}
body.rd3-layout .sidebar-container .widget + .widget{
  border-top:1px solid var(--rd3-border) !important;
}

/* ===== 1240px 미만: 좌측 아이콘 레일 + 중앙 ===== */
@media screen and (max-width:1239px) and (min-width:1024px){
  body.rd3-layout .main_content_container{
    grid-template-columns:76px minmax(0,1fr);
    gap:12px;
    max-width:960px !important;
    padding:0 12px !important;
  }
  body.rd3-layout .main_content_container > .page{grid-column:2}
  body.rd3-layout .main_content_container > .rd3-left{grid-column:1}
  body.rd3-layout .main_content_container > .sidebar-container{display:none !important}

  .rd3-left-inner{padding:2px 8px 10px 0}
  .rd3-title,
  .rd3-label,
  .rd3-left-slot{display:none !important}
  .rd3-nav{gap:3px}
  .rd3-link{
    justify-content:center;
    min-height:44px;
    padding:0;
    border-radius:12px;
  }
  .rd3-ico{width:22px;height:22px}
  .rd3-ico svg{width:22px;height:22px}
}

/* ===== 1024px 미만: 1열 ===== */
@media screen and (max-width:1023px){
  body.rd3-layout .main_content_container{
    display:block !important;
    max-width:100% !important;
    padding:0 12px !important;
  }
  body.rd3-layout .rd3-left,
  body.rd3-layout .sidebar-container{display:none !important}
  body.rd3-layout .main_content_container > .page{
    width:100% !important;
    max-width:none !important;
    margin:0 auto !important;
  }
  body.rd3-layout .page_body{max-width:none !important}
}

@media (prefers-reduced-motion:reduce){
  .rd3-link{transition:none}
}