:root {
  --bg: #ffffff;
  --card: #ffffff;
  --text: #111;
  --muted: #1b1414;
  --accent: #000203;
  --card-shadow: rgba(16,24,40,0.06);
}

body.light {
  --bg: #f4f6f8;
  --card:white;
  --text: #000409;
  --muted: #070708;
  --accent: #2d86f0;
  --card-shadow: rgba(16,24,40,0.06);
}

body.dark {
  --bg: #0d0d0f;
  --card:rgb(9, 8, 67);
  --text: #f5f5f5;
  --muted: #e2d0d0;
  --accent: #3d78bc;
  --card-shadow:rgb(198, 183, 183);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Segoe UI", Roboto, system-ui, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* nav */
.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  background: linear-gradient(90deg, rgba(0,0,0,0.02), transparent);
  border-bottom: 1px solid rgba(0,0,0,0.04);
}
.brand { font-weight: 700; font-size: 18px; }
.nav-actions { display:flex; gap:8px; align-items:center; }

/* layout */
.container {
  max-width: 980px;
  margin: 28px auto;
  padding: 0 16px;
}
.card {
  background: var(--card);
  padding: 18px;
  border-radius: 12px;
  box-shadow: 0 8px 24px var(--card-shadow);
  margin-bottom: 18px;
}

/* grid */
.row { display:flex; gap:12px; flex-wrap:wrap; margin-bottom:12px;  }
.col { flex:1; min-width:160px; display:flex; flex-direction:column; gap:8px; }

label { font-size:13px; color:var(--muted); }
input[type="number"], select, input[type="text"] {
  padding:10px 12px; border-radius:8px; border:1px solid rgba(11, 0, 0, 0.08);
  background: rgba(8, 0, 0, 0.02); color:var(--text);
}

/* buttons */
.btn { padding:8px 12px; border-radius:8px; border:none; cursor:pointer; }
.btn.small { padding:6px 10px; font-size:13px; }
.btn.primary { background:var(--accent); color:white;  width:200px; height:30px}
.btn.ghost { background:rgb(148, 148, 157); border:1px solid rgba(0,0,0,0.08);width:200px; height:30px; }

/* output */
.output-grid { display:flex; gap:16px; flex-wrap:wrap; }
.graph-card { flex:1; min-width:320px; background: rgba(255,255,255,0.015); padding:12px; border-radius:10px; }
.graph { width:100%; border-radius:8px; display:block; margin:8px 0; box-shadow: 0 8px 20px rgba(2,6,23,0.15); }

/* stats card */
.stats { display:flex; gap:10px; flex-wrap:wrap; margin-top:6px; }
.stat { background: rgba(255,255,255,0.02); padding:8px 10px; border-radius:8px; min-width:100px; text-align:center; }
.stat-key { font-size:12px; color:var(--muted); }
.stat-val { font-weight:700; font-size:15px; color:var(--text); }

/* small helpers */
.muted { color:var(--muted); font-size:13px; }
.hidden { display:none; }
.actions { display:flex; gap:10px; margin-top:8px; }

/* footer */
.footer { max-width:980px; margin: 0 auto 40px; padding: 8px 16px; color:var(--muted); font-size:13px; display:flex; justify-content:space-between; }

/* responsive */
@media (max-width:880px) {
  .output-grid { flex-direction:column; }
  .row { flex-direction:column; }
}

#mode-select {
  border : 1px solid rgb(100, 85, 36);
}

#dist1 {
  border:1px solid rgb(100, 85, 36);
}

#samp {
  border : 1px solid rgb(100, 86, 36);
}

#dist2 {
  border: 1px solid rgb(100, 85, 36);
}

#samp2 {
  border: 1px solid rgb(100, 85, 36);
}

#brd {
  border: 1px solid rgb(100, 86, 37);
}