:root{
  /* ---- Light theme (default) ---- */
  --bg:#FFFFFF;
  --bg-alt:#F7F7F9;
  --card:#FFFFFF;
  --border:#E7E7EC;
  --text:#16181D;
  --text-muted:#6B7280;
  --accent:#6D5EF5;
  --accent-hover:#5A4CE0;
  --accent-soft:#EFECFE;
  --danger:#DC4444;
  --danger-soft:#FCEAEA;
  --shadow:0 1px 2px rgba(16,17,26,.04), 0 8px 24px rgba(16,17,26,.06);
  --radius:12px;
}
html[data-theme="dark"]{
  --bg:#0E0F13;
  --bg-alt:#16181F;
  --card:#181A22;
  --border:#272A34;
  --text:#E9EAEF;
  --text-muted:#8D93A3;
  --accent:#8C7DFF;
  --accent-hover:#A192FF;
  --accent-soft:#241F3D;
  --danger:#F0685F;
  --danger-soft:#3A2222;
  --shadow:0 1px 2px rgba(0,0,0,.3), 0 12px 28px rgba(0,0,0,.35);
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
html{color-scheme:light;}
html[data-theme="dark"]{color-scheme:dark;}
body{
  background:var(--bg); color:var(--text);
  font-family:'Inter',sans-serif; font-size:14px; line-height:1.5;
  -webkit-font-smoothing:antialiased;
  transition:background-color .2s ease, color .2s ease;
}
h1,h2,h3,.display{font-family:'Bricolage Grotesque',sans-serif; font-weight:600; letter-spacing:-0.01em; margin:0;}
.mono{font-family:'JetBrains Mono',monospace;}
.muted{color:var(--text-muted);}
.small{font-size:12px;}
.center{text-align:center;}
button{font-family:inherit;}
a{color:inherit; text-decoration:none;}

/* ---------------- Login ---------------- */
#loginScreen{
  position:fixed; inset:0; background:var(--bg-alt); z-index:500;
  display:flex; align-items:center; justify-content:center; padding:20px;
}
.login-card{
  max-width:360px; width:100%; background:var(--card); border:1px solid var(--border);
  border-radius:16px; padding:34px 28px; box-shadow:var(--shadow); text-align:center;
}
.login-card h1{font-size:22px; margin:12px 0 2px;}
.login-card .field{text-align:left; margin-top:16px;}
.login-error{color:var(--danger); font-size:12.5px; min-height:16px; margin:10px 0 0;}
.brand-mark{
  width:46px; height:46px; border-radius:13px; margin:0 auto;
  background:linear-gradient(135deg, var(--accent), #B7A9FF);
  color:#fff; display:flex; align-items:center; justify-content:center;
  font-family:'Bricolage Grotesque',sans-serif; font-weight:700; font-size:20px;
}
.brand-mark.sm{width:32px; height:32px; border-radius:9px; font-size:14px;}

label{display:block; font-size:12px; font-weight:600; color:var(--text-muted); margin-bottom:5px;}
input,select,textarea{
  width:100%; padding:9px 11px; border:1px solid var(--border); border-radius:9px;
  background:var(--bg); color:var(--text); font-size:13.5px; font-family:inherit;
  transition:border-color .15s, background-color .2s;
}
input:focus,select:focus,textarea:focus{outline:none; border-color:var(--accent);}

/* ---------------- Buttons ---------------- */
.btn{
  display:inline-flex; align-items:center; gap:6px; padding:9px 15px; border-radius:9px;
  border:1px solid transparent; font-size:13px; font-weight:600; cursor:pointer;
  transition:filter .12s, background-color .15s, border-color .15s, transform .08s;
}
.btn:active{transform:scale(.98);}
.btn-accent{background:var(--accent); color:#fff;}
.btn-accent:hover{background:var(--accent-hover);}
.btn-ghost{background:transparent; border-color:var(--border); color:var(--text);}
.btn-ghost:hover{background:var(--bg-alt);}
.btn-danger{background:transparent; color:var(--danger); border-color:var(--danger);}
.btn-danger:hover{background:var(--danger-soft);}
.icon-btn{
  background:none; border:none; cursor:pointer; padding:7px; border-radius:8px; color:var(--text-muted);
  display:inline-flex; align-items:center; justify-content:center; transition:background-color .15s, color .15s;
}
.icon-btn:hover{background:var(--bg-alt); color:var(--text);}
.icon-btn.danger:hover{background:var(--danger-soft); color:var(--danger);}

/* ---------------- Layout ---------------- */
#app{display:flex; height:100vh; overflow:hidden;}
.sidebar{
  width:280px; flex:none; background:var(--bg-alt); border-right:1px solid var(--border);
  display:flex; flex-direction:column; transition:background-color .2s, border-color .2s, transform .2s;
}
.sidebar-top{padding:18px 16px 12px; display:flex; align-items:center; justify-content:space-between;}
.brand-row{display:flex; align-items:center; gap:10px;}
.brand-title{font-family:'Bricolage Grotesque',sans-serif; font-weight:600; font-size:14.5px;}
.brand-sub{font-size:11px; color:var(--text-muted);}

.sidebar-search{
  margin:0 14px 10px; display:flex; align-items:center; gap:8px;
  background:var(--card); border:1px solid var(--border); border-radius:9px; padding:8px 10px;
  color:var(--text-muted);
}
.sidebar-search input{border:none; padding:0; background:none; flex:1;}
.sidebar-search input:focus{outline:none;}

.sidebar-scroll{flex:1; overflow-y:auto; padding:4px 10px 10px;}

.cat-block{margin-bottom:2px;}
.cat-head{
  display:flex; align-items:center; gap:8px; padding:9px 8px; border-radius:8px; cursor:pointer;
  user-select:none; transition:background-color .15s;
}
.cat-head:hover{background:var(--card);}
.cat-head .chevron{
  transition:transform .2s ease; color:var(--text-muted); flex:none; display:flex;
}
.cat-block.open > .cat-head .chevron{transform:rotate(90deg);}
.cat-head .name{flex:1; font-weight:600; font-size:13.5px; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap;}
.cat-head .count{font-family:'JetBrains Mono',monospace; font-size:10.5px; color:var(--text-muted); background:var(--card); border:1px solid var(--border); border-radius:20px; padding:1px 7px;}
.cat-head .cat-actions{display:none; gap:2px;}
.cat-head:hover .cat-actions{display:flex;}
.cat-head .cat-actions button{padding:4px; border-radius:6px;}

.cat-pdfs{
  display:grid; grid-template-rows:0fr; transition:grid-template-rows .22s ease;
  overflow:hidden; margin-left:10px; border-left:1px solid var(--border); padding-left:8px;
}
.cat-block.open > .cat-pdfs{grid-template-rows:1fr;}
.cat-pdfs-inner{overflow:hidden; min-height:0;}

.pdf-item{
  display:flex; align-items:center; gap:8px; padding:7px 8px; border-radius:7px; cursor:pointer;
  font-size:13px; color:var(--text-muted); transition:background-color .15s, color .15s, transform .1s;
}
.pdf-item:hover{background:var(--card); color:var(--text); transform:translateX(2px);}
.pdf-item.active{background:var(--accent-soft); color:var(--accent); font-weight:600;}
.pdf-item .pname{flex:1; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap;}
.pdf-item svg{flex:none;}
.pdf-empty{padding:8px 8px 10px; font-size:12px; color:var(--text-muted); font-style:italic;}
.add-pdf-row{
  display:flex; align-items:center; gap:6px; padding:6px 8px; margin-top:2px;
  font-size:12px; color:var(--accent); cursor:pointer; border-radius:7px;
}
.add-pdf-row:hover{background:var(--accent-soft);}

.sidebar-bottom{padding:12px 14px 16px; padding-bottom:max(16px, env(safe-area-inset-bottom)); border-top:1px solid var(--border);}
.sidebar-add-btn{
  width:100%; padding:9px; border-radius:9px; border:1px dashed var(--border); background:none;
  color:var(--text-muted); font-size:13px; font-weight:600; cursor:pointer; transition:all .15s;
}
.sidebar-add-btn:hover{border-color:var(--accent); color:var(--accent); background:var(--accent-soft);}
.sidebar-foot-links{display:flex; justify-content:space-between; margin-top:12px;}
.sidebar-foot-links button{
  background:none; border:none; color:var(--text-muted); font-size:11px; cursor:pointer;
  text-decoration:underline; padding:0;
}
.sidebar-foot-links button:hover{color:var(--text);}

.main{flex:1; min-width:0; display:flex; flex-direction:column; background:var(--bg);}
.hamburger{
  display:none; align-items:center; gap:8px; margin:14px 0 0 16px; background:var(--card);
  border:1px solid var(--border); color:var(--text); padding:8px 13px; border-radius:9px;
  font-weight:600; font-size:13px; cursor:pointer; align-self:flex-start;
}

/* ---------------- Landing ---------------- */
.landing{flex:1; overflow-y:auto; padding:56px 40px;}
.landing-title{font-size:32px;}
.landing-sub{color:var(--text-muted); margin-top:8px; font-size:14.5px;}
.landing-grid{
  margin-top:32px; display:grid; grid-template-columns:repeat(auto-fill, minmax(200px,1fr)); gap:14px;
}
.landing-card{
  background:var(--card); border:1px solid var(--border); border-radius:var(--radius);
  padding:18px; cursor:pointer; transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease;
  opacity:0; animation:cardIn .4s ease forwards;
}
.landing-card:hover{transform:translateY(-3px); box-shadow:var(--shadow); border-color:var(--accent);}
.landing-card .cname{font-family:'Bricolage Grotesque',sans-serif; font-weight:600; font-size:15px;}
.landing-card .ccount{color:var(--text-muted); font-size:12px; margin-top:4px;}
@keyframes cardIn{ from{opacity:0; transform:translateY(8px);} to{opacity:1; transform:translateY(0);} }
.landing-empty{color:var(--text-muted); margin-top:10px;}

/* ---------------- Viewer ---------------- */
#viewerView{flex:1; display:flex; flex-direction:column; min-height:0;}
.viewer-header{
  display:flex; align-items:center; justify-content:space-between; gap:10px;
  padding:14px 22px; border-bottom:1px solid var(--border); flex:none;
}
.viewer-crumb{flex:1; font-size:13.5px; min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap;}
.viewer-crumb #crumbTitle{font-weight:600;}
.viewer-actions{display:flex; gap:2px; flex:none;}
.viewer-frame-wrap{flex:1; min-height:0; animation:fadeIn .25s ease;}
.viewer-frame{width:100%; height:100%; border:none; background:#525659;}
@keyframes fadeIn{ from{opacity:0;} to{opacity:1;} }

/* ---------------- Word-file placeholder ---------------- */
.doc-preview{flex:1; display:flex; align-items:center; justify-content:center; padding:30px; animation:fadeIn .25s ease;}
.doc-card{
  display:flex; flex-direction:column; align-items:center; gap:6px; text-align:center;
  background:var(--card); border:1px solid var(--border); border-radius:16px; padding:36px 30px; max-width:380px;
}
.doc-card svg{color:var(--accent); margin-bottom:6px;}
.doc-title{font-family:'Bricolage Grotesque',sans-serif; font-weight:600; font-size:15px;}
.doc-card .btn{margin-top:14px;}

/* ---------------- Markdown read view ---------------- */
.markdown-view{flex:1; overflow-y:auto; animation:fadeIn .25s ease;}
.md-content{max-width:760px; margin:0 auto; padding:40px 32px 80px; line-height:1.7;}
.md-content h1,.md-content h2,.md-content h3{margin:1.4em 0 .5em; line-height:1.3;}
.md-content h1{font-size:26px;}
.md-content h2{font-size:21px;}
.md-content h3{font-size:17px;}
.md-content p{margin:.8em 0;}
.md-content ul,.md-content ol{margin:.8em 0; padding-left:1.4em;}
.md-content li{margin:.3em 0;}
.md-content a{color:var(--accent); text-decoration:underline;}
.md-content blockquote{
  margin:1em 0; padding:2px 16px; border-left:3px solid var(--accent); color:var(--text-muted); font-style:italic;
}
.md-content img{max-width:100%; border-radius:8px;}
.md-content code{
  font-family:'JetBrains Mono',monospace; font-size:.88em; background:var(--bg-alt);
  border:1px solid var(--border); border-radius:5px; padding:1px 6px;
}
.md-content pre{
  background:#0D0E12; border-radius:10px; padding:16px 18px; overflow-x:auto; margin:1.1em 0;
  border:1px solid var(--border); position:relative;
}
.md-content pre code{background:none; border:none; padding:0; font-size:13px; line-height:1.6;}
.md-content table{border-collapse:collapse; width:100%; margin:1em 0; font-size:13.5px;}
.md-content th,.md-content td{border:1px solid var(--border); padding:6px 10px; text-align:left;}
.md-content th{background:var(--bg-alt);}
.md-content hr{border:none; border-top:1px solid var(--border); margin:1.6em 0;}

/* ---------------- Markdown editor ---------------- */
.markdown-edit{flex:1; display:flex; flex-direction:column; min-height:0; padding:18px 22px; gap:12px;}
.md-edit-title{
  font-family:'Bricolage Grotesque',sans-serif; font-size:19px; font-weight:600; border:none; background:none;
  padding:4px 0; border-bottom:1px solid var(--border); color:var(--text);
}
.md-edit-title:focus{outline:none; border-color:var(--accent);}
.md-edit-body{flex:1; display:grid; grid-template-columns:1fr 1fr; gap:16px; min-height:0;}
.md-edit-textarea{
  width:100%; height:100%; resize:none; font-family:'JetBrains Mono',monospace; font-size:13px; line-height:1.6;
  border:1px solid var(--border); border-radius:10px; padding:14px; background:var(--bg-alt); color:var(--text);
}
.md-edit-preview{
  overflow-y:auto; border:1px solid var(--border); border-radius:10px; background:var(--card);
}
.md-edit-preview .md-content{padding:20px 22px; max-width:none;}
.md-edit-toolbar{display:flex; align-items:center; justify-content:space-between; flex:none;}

.copy-btn{
  position:absolute; top:8px; right:8px; padding:4px 9px; font-size:11px; font-weight:600;
  border-radius:6px; border:1px solid rgba(255,255,255,.18); background:rgba(255,255,255,.08);
  color:#D7D9E0; cursor:pointer; font-family:'Inter',sans-serif; transition:background-color .15s;
}
.copy-btn:hover{background:rgba(255,255,255,.18);}

/* ---------------- Kind badges (sidebar) ---------------- */
.kind-badge{
  flex:none; width:22px; height:18px; border-radius:4px; display:flex; align-items:center; justify-content:center;
  font-size:9px; font-weight:700; font-family:'JetBrains Mono',monospace; letter-spacing:-.02em;
}
.kind-badge.pdf{background:#FCE8E6; color:#C0392B;}
.kind-badge.doc{background:#E6EEFC; color:#2E5DBF;}
.kind-badge.markdown{background:var(--accent-soft); color:var(--accent);}
html[data-theme="dark"] .kind-badge.pdf{background:#3A2222; color:#F0685F;}
html[data-theme="dark"] .kind-badge.doc{background:#1F2A3D; color:#7DA6F5;}

/* ---------------- Modal ---------------- */
.modal-overlay{
  position:fixed; inset:0; background:rgba(10,10,14,.5); backdrop-filter:blur(2px);
  display:none; align-items:flex-start; justify-content:center; z-index:100; padding:8vh 16px; overflow-y:auto;
}
.modal-overlay.open{display:flex;}
.modal{
  background:var(--card); border:1px solid var(--border); border-radius:14px; width:100%; max-width:440px;
  padding:22px 24px 20px; box-shadow:var(--shadow);
}
.modal h3{font-size:18px; margin-bottom:14px;}
.modal .field{margin-bottom:13px;}
.modal .foot{display:flex; justify-content:flex-end; gap:8px; margin-top:16px;}
.modal .close-x{float:right; background:none; border:none; cursor:pointer; color:var(--text-muted); font-size:18px;}
.note{font-size:12px; color:var(--text-muted); margin-top:8px;}

/* Drag & drop upload zone */
.drop-zone{
  border:2px dashed var(--border); border-radius:10px; padding:24px; text-align:center;
  color:var(--text-muted); font-size:13px; cursor:pointer; transition:border-color .15s, background-color .15s;
}
.drop-zone.drag{border-color:var(--accent); background:var(--accent-soft); color:var(--accent);}
.drop-zone input{display:none;}
.upload-progress{height:6px; border-radius:4px; background:var(--border); margin-top:12px; overflow:hidden; display:none;}
.upload-progress-bar{height:100%; width:0%; background:var(--accent); transition:width .15s;}

/* ---------------- Toast ---------------- */
#toast{
  position:fixed; bottom:22px; left:50%; transform:translateX(-50%) translateY(20px);
  background:var(--text); color:var(--bg); padding:10px 18px; border-radius:9px; font-size:13px;
  box-shadow:var(--shadow); z-index:200; opacity:0; pointer-events:none; transition:all .25s;
}
#toast.show{opacity:1; transform:translateX(-50%) translateY(0);}

/* ---------------- Mobile ---------------- */
@media(max-width:880px){
  .sidebar{
    position:fixed; top:0; bottom:0; left:0; z-index:60; transform:translateX(-100%);
    box-shadow:0 0 0 2000px rgba(0,0,0,0);
  }
  .sidebar.open{transform:translateX(0); box-shadow:0 0 40px rgba(0,0,0,.25);}
  .hamburger{display:inline-flex;}
  .landing{padding:20px;}
  .landing-title{font-size:24px;}
  .viewer-header{padding:12px 14px;}
  input,select,textarea{font-size:16px;} /* avoid iOS auto-zoom */
  .modal-overlay{padding:0; align-items:flex-end;}
  .modal{border-radius:14px 14px 0 0; max-height:92vh; overflow-y:auto;}
  .md-edit-body{grid-template-columns:1fr; grid-template-rows:1fr 1fr;}
  .md-content{padding:24px 18px 60px;}
  .markdown-edit{padding:14px;}
  .sidebar-foot-links{flex-wrap:wrap; gap:8px;}
}

/* Safe-area clearance for notches when installed as a PWA */
.sidebar-top{padding-top:max(18px, calc(env(safe-area-inset-top) + 8px));}
.hamburger{margin-top:max(14px, env(safe-area-inset-top));}