:root{
  --bg:#0f0f10; --panel:#19191b; --gold:#d4af37; --text:#e0e0e0; --muted:#909090;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; background:var(--bg); color:var(--text);
  font-family:Inter,system-ui,ui-sans-serif,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  overflow:hidden;
}

#app{display:grid; grid-template-columns:320px 1fr; height:100%}

.sidebar{
  background:var(--panel); border-right:1px solid rgba(212,175,55,.35);
  overflow:auto; padding:.75rem 1rem;
}
h1{margin:.25rem 0 .5rem; color:var(--gold); font-size:1.35rem; letter-spacing:.3px}

.controls{display:flex; flex-direction:column; gap:.5rem; font-size:.92rem}
select,input.search{
  background:#0a0a0a; color:var(--text); border:1px solid rgba(212,175,55,.5);
  border-radius:6px; padding:.35rem .5rem;
}
input.search::placeholder{color:#777}

nav{margin-top:.75rem}
.file,.dir{
  display:block; padding:.25rem .35rem; border-radius:6px;
  text-decoration:none; color:var(--text); cursor:pointer; user-select:none;
}
.file:hover,.dir:hover{background:rgba(212,175,55,.12)}
.file.active{background:rgba(212,175,55,.18); outline:1px solid rgba(212,175,55,.25)}
.pin{color:var(--gold); font-weight:600; margin-right:.25rem}

.dir .label{display:flex; align-items:center}
.dir .label::before{content:"▶"; margin-right:.45rem; font-size:.85em; color:var(--gold)}
.dir.open .label::before{content:"▼"}
.children{display:none; margin-left:1rem}
.dir.open .children{display:block}

.content{overflow:auto}
.viewer{max-width:780px; margin:0 auto; padding:1.25rem 1rem 2.5rem}

#meta{color:var(--muted); font-size:.92rem; margin:0 0 .75rem}
iframe,#mdView{width:100%; border:none; background:transparent; color:var(--text)}
iframe{height:calc(100vh - 5.5rem); min-height:550px}
.md pre,.md code{background:#111; color:#f1cf6b; padding:.5rem .6rem; border-radius:6px; overflow-x:auto}
.md img{max-width:100%}
.error{margin-top:1rem; color:#ff6b6b; background:#2a1313; border:1px solid #7a2f2f; padding:.75rem .9rem; border-radius:8px}

/* Mobile drawer */
.nav-toggle{
  display:none; position:fixed; top:10px; left:10px; z-index:2000;
  background:var(--panel); color:var(--gold); border:1px solid var(--gold);
  border-radius:8px; padding:6px 10px; font-size:20px
}
.overlay{display:none; position:fixed; inset:0; background:rgba(0,0,0,.5); z-index:1100}

@media (max-width:900px){
  #app{grid-template-columns:1fr}
  .nav-toggle{display:block}
  .sidebar{
    position:fixed; inset:0 auto 0 0; width:min(82vw,340px); transform:translateX(-100%);
    transition:transform .25s ease; z-index:1200
  }
  .sidebar.open{transform:translateX(0)}
  .sidebar.open ~ .overlay{display:block}
  .content{overflow:auto}
}