:root{
  --bg:#f7f5f0;
  --panel:#ffffff;
  --accent:#8a6d3b;      /* dezentes Gold/Braun, Kirchen-Look */
  --accent-dark:#5c4a28;
  --blue:#1f3a5f;        /* ruhiges Blau */
  --text:#2b2b2b;
  --border:#e2ddd3;
  --radius:12px;
}
*{box-sizing:border-box;}
body{
  margin:0;
  font-family:"Segoe UI", Arial, sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
}
header{
  background:var(--blue);
  color:#fff;
  padding:1.2rem 2rem;
  display:flex;
  justify-content:space-between;
  align-items:center;
}
header h1{margin:0;font-size:1.4rem;font-weight:600;}
nav a{
  color:#fff;
  text-decoration:none;
  margin-left:1.5rem;
  font-weight:500;
  border-bottom:2px solid transparent;
  padding-bottom:4px;
  transition:.2s;
}
nav a:hover, nav a.active{border-color:var(--accent);}

main{max-width:1100px;margin:2rem auto;padding:0 1.5rem;}

.card-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(260px,1fr));
  gap:1.2rem;
}
.card{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:1.2rem;
  box-shadow:0 2px 6px rgba(0,0,0,.04);
  transition:.2s;
  cursor:pointer;
}
.card:hover{transform:translateY(-3px);box-shadow:0 6px 16px rgba(0,0,0,.08);}
.card h3{margin:0 0 .4rem;color:var(--blue);font-size:1.05rem;}
.card .meta{font-size:.8rem;color:#777;margin-bottom:.6rem;}
.card .filetype{
  display:inline-block;
  font-size:.7rem;
  padding:2px 8px;
  border-radius:20px;
  background:var(--accent);
  color:#fff;
}

/* --- Viewer-Fenster (Modal) --- */
.viewer-overlay{
  display:none;
  position:fixed; inset:0;
  background:rgba(0,0,0,.55);
  z-index:999;
  justify-content:center;
  align-items:center;
}
.viewer-overlay.open{display:flex;}
.viewer-window{
  background:#fff;
  width:90%; max-width:950px;
  height:85vh;
  border-radius:var(--radius);
  display:flex;
  flex-direction:column;
  overflow:hidden;
  box-shadow:0 10px 40px rgba(0,0,0,.3);
}
.viewer-header{
  background:var(--blue);
  color:#fff;
  padding:.9rem 1.2rem;
  display:flex;
  justify-content:space-between;
  align-items:center;
}
.viewer-header h2{margin:0;font-size:1.1rem;}
.viewer-header button{
  background:none;border:none;color:#fff;
  font-size:1.4rem;cursor:pointer;
}
.viewer-body{flex:1;overflow:auto;background:#525659;}
.viewer-body iframe{width:100%;height:100%;border:none;background:#fff;}
.viewer-body .docx-preview{
  background:#fff;padding:2rem;max-width:800px;margin:0 auto;
}

/* Upload-Formular */
form.upload{
  background:var(--panel);
  border:1px solid var(--border);
  border-radius:var(--radius);
  padding:1.5rem;
  max-width:500px;
}
form.upload label{display:block;margin:.8rem 0 .3rem;font-weight:600;}
form.upload input, form.upload select{
  width:100%;padding:.5rem;border:1px solid var(--border);border-radius:6px;
}
form.upload button{
  margin-top:1.2rem;
  background:var(--accent);
  color:#fff;border:none;
  padding:.7rem 1.4rem;
  border-radius:6px;
  cursor:pointer;
  font-weight:600;
}
form.upload button:hover{background:var(--accent-dark);}

.lesson-list{list-style:none;padding:0;}
.lesson-list li{
  padding:.6rem .9rem;
  border-bottom:1px solid var(--border);
  display:flex;justify-content:space-between;align-items:center;
  cursor:pointer;
}
.lesson-list li:hover{background:#f0ede6;}