:root {
  --bg: #0b0f14;
  --panel: #121826;
  --muted: #7a8599;
  --text: #e6edf6;
  --primary: #6ea8fe;
  --accent: #22c55e;
  --danger: #ef4444;
  --card: #0f1623;
  --border: #223047;

  --study: #7bb3ff;   /* study bar color */
  --workout: #22c55e; /* workout bar color */
  --hbar: #25344d;    /* background for horizontal bars */
}
* { box-sizing: border-box; }
body {
  margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: radial-gradient(1200px 800px at 80% -10%, #18314f55, transparent), var(--bg);
  color: var(--text);
}
.container { max-width: 1200px; margin: 0 auto; padding: 24px; }
header { display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom: 18px; }
h1 { font-size: 28px; margin: 0; letter-spacing: 0.2px; }
.sub { color: var(--muted); font-size: 14px; }
.grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 16px; }
@media (max-width:1000px){ .grid{ grid-template-columns: 1fr; } }

.card { background: linear-gradient(180deg, var(--panel), var(--card)); border:1px solid var(--border); border-radius: 16px; box-shadow: 0 10px 24px rgba(0,0,0,.25); }
.card h2 { font-size: 18px; margin: 0 0 12px; }
.pad { padding: 18px; }
.row { display:flex; gap:12px; flex-wrap: wrap; }

label { display:block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
input, select, textarea { width:100%; border:1px solid var(--border); background:#0b1320; color:var(--text); padding:10px 12px; border-radius:12px; outline:none; font-size:14px; }
textarea{ min-height:72px; resize: vertical; }

.btn { appearance:none; border:none; padding:10px 14px; border-radius:12px; font-weight:600; cursor:pointer; }
.btn-primary{ background:linear-gradient(180deg, #7bb3ff, #3b82f6); color:#00172b; }
.btn-ghost{ background:transparent; color:var(--text); border:1px solid var(--border); }
.btn-danger{ background: linear-gradient(180deg, #ff8a8a, #ef4444); color:#2b0000; }
.btn + .btn{ margin-left:8px; }

.tools { display:flex; gap:8px; flex-wrap: wrap; align-items:center; }

.table { width:100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { padding: 10px 8px; border-bottom:1px solid var(--border); }
.table th { text-align:left; color: var(--muted); font-weight:600; }
.table td.actions { text-align:right; }
.pill { display:inline-flex; align-items:center; gap:6px; padding:6px 10px; border-radius:999px; border:1px solid var(--border); background:#0b1320; font-size:12px; color: var(--muted); }
.kpi { display:grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
@media (max-width:700px){ .kpi{ grid-template-columns: repeat(2, 1fr);} }
.kpi .item { padding:14px; border-radius:14px; border:1px solid var(--border); background:#0b1320; }
.kpi .item .val { font-size:22px; font-weight:700; }
.muted { color: var(--muted); }
footer { margin-top: 16px; color: var(--muted); font-size: 12px; }
.small { font-size: 12px; }

/* Chart styles */
.chart-card { margin-top: 12px; }
.chart-title { font-weight: 600; margin-bottom: 8px; }
.legend { display:flex; align-items:center; gap:16px; color: var(--muted); font-size: 12px; margin-bottom: 8px; }
.legend-dot { width:10px; height:10px; border-radius:999px; display:inline-block; }
.legend-dot.study { background: var(--study); }
.legend-dot.workout { background: var(--workout); }

/* Grouped vertical bars by day */
.bar-chart { display:flex; gap:10px; align-items:flex-end; padding: 10px; border:1px solid var(--border); border-radius:12px; background:#0b1320; overflow-x:auto; }
.bar-group { display:flex; flex-direction:column; align-items:center; gap:6px; min-width: 44px; }
.bars { display:flex; align-items:flex-end; gap:4px; height: 120px; }
.bar { width:12px; border-radius: 6px 6px 0 0; background: var(--muted); }
.bar.study { background: var(--study); }
.bar.workout { background: var(--workout); }
.bar-label { font-size: 11px; color: var(--muted); }

/* Horizontal bars (mood distribution) */
.hbar-chart { display:flex; flex-direction:column; gap:8px; padding:10px; border:1px solid var(--border); border-radius:12px; background:#0b1320; }
.hbar-row { display:flex; align-items:center; gap:8px; }
.hbar-tag { min-width: 48px; text-align:right; font-size:12px; color: var(--muted); }
.hbar-track { flex:1; background: var(--hbar); border-radius:10px; overflow:hidden; height: 12px; }
.hbar-fill { height:100%; background: var(--primary); }
.hbar-count { width:38px; text-align:right; font-size:12px; color: var(--muted); }