:root{
  --bg:#0b0f14;
  --panel:#121824;
  --text:#e8eef7;
  --muted:#93a4bb;
  --line:#223044;
  --btn:#263449;
  --btn2:#2f7bf6;
  --err:#ff5a5f;
}

*{ box-sizing:border-box; }
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background:var(--bg);
  color:var(--text);
}

.topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:12px 16px;
  border-bottom:1px solid var(--line);
}
.brand{ font-weight:700; letter-spacing:0.2px; }

.layout{
  display:grid;
  grid-template-columns: 340px 1fr;
  gap:16px;
  padding:16px;
}

.panel{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:12px;
  padding:14px;
}

.panel-title{ font-weight:700; margin-bottom:6px; }
.muted{ color:var(--muted); font-size:13px; }

.input{
  width:100%;
  padding:10px 10px;
  border-radius:10px;
  border:1px solid var(--line);
  background:#0d131d;
  color:var(--text);
}

.btn{
  display:inline-block;
  padding:10px 12px;
  border-radius:10px;
  border:1px solid var(--line);
  background:var(--btn);
  color:var(--text);
  text-decoration:none;
  cursor:pointer;
}
.btn.primary{
  background:var(--btn2);
  border-color:transparent;
}
.topbar-actions .btn{ padding:8px 10px; }

.row{
  display:flex;
  gap:12px;
  align-items:flex-start;
  justify-content:space-between;
}
.row-right{
  display:flex;
  gap:10px;
  align-items:center;
}

.grid2{
  margin-top:14px;
  display:grid;
  grid-template-columns: 1fr 360px;
  gap:16px;
}

.list{ margin-top:10px; display:flex; flex-direction:column; gap:10px; }
.exercise{
  border:1px solid var(--line);
  border-radius:12px;
  padding:10px;
  background:#0d131d;
}
.ex-title{ font-weight:700; }
.ex-desc{ color:var(--muted); font-size:13px; margin-top:4px; }
.ex-actions{
  margin-top:10px;
  display:flex;
  align-items:center;
  justify-content:space-between;
}
.link{ color:#9cc2ff; text-decoration:none; font-size:13px; }
.mini{
  padding:7px 10px;
  border-radius:10px;
  border:1px solid var(--line);
  background:var(--btn);
  color:var(--text);
  cursor:pointer;
}

.subhead{ font-weight:700; margin-bottom:8px; }

.entries{ display:flex; flex-direction:column; gap:10px; }
.entry{
  display:flex;
  justify-content:space-between;
  gap:12px;
  border:1px solid var(--line);
  border-radius:12px;
  padding:10px;
  background:#0d131d;
}
.entry-who{ font-size:12px; color:var(--muted); }
.entry-main{ font-weight:700; margin-top:2px; }
.entry-detail{ font-size:13px; color:var(--muted); margin-top:4px; }
.entry-time{ font-variant-numeric: tabular-nums; color:var(--muted); }

.leaderboard{ display:flex; flex-direction:column; gap:8px; }
.lb-row{
  display:flex;
  justify-content:space-between;
  border:1px solid var(--line);
  border-radius:12px;
  padding:10px;
  background:#0d131d;
}
.lb-val{ font-variant-numeric: tabular-nums; color:var(--muted); }

.form{ display:flex; flex-direction:column; gap:10px; }
.form-row label{ display:block; font-size:12px; color:var(--muted); margin-bottom:4px; }

.status{ margin-top:6px; font-size:13px; color:var(--muted); }
.status.err{ color:var(--err); }

@media (max-width: 980px){
  .layout{ grid-template-columns: 1fr; }
  .grid2{ grid-template-columns: 1fr; }
}