* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  background: #f2f4f8;
  color: #1a1f2b;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: #0f172a;
  color: #e2e8f0;
}

.topbar h1 {
  margin: 0;
  font-size: 20px;
}

#sessionMeta {
  font-size: 12px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(280px, 1fr));
  gap: 12px;
  padding: 12px;
  align-items: start;
}

.panel {
  background: #ffffff;
  border: 1px solid #d7dee9;
  border-radius: 8px;
  padding: 10px;
}

.panel h2 {
  margin: 0 0 10px;
  font-size: 16px;
}

.panel h3 {
  margin: 10px 0 6px;
  font-size: 14px;
}

.row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
}

.stack {
  display: flex;
  flex-direction: column;
}

input[type="text"],
select {
  border: 1px solid #c3cedf;
  border-radius: 6px;
  padding: 6px 8px;
  min-width: 160px;
}

button {
  border: 1px solid #0f172a;
  background: #0f172a;
  color: #ffffff;
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
}

button.secondary {
  background: #e2e8f0;
  color: #1a1f2b;
  border-color: #c3cedf;
}

.list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 260px;
  overflow: auto;
  border: 1px solid #e4eaf2;
  border-radius: 6px;
}

.list li {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  border-bottom: 1px solid #edf1f7;
  padding: 6px 8px;
  font-size: 13px;
}

.list li:last-child {
  border-bottom: none;
}

.muted {
  color: #475569;
  font-size: 12px;
  margin-bottom: 8px;
}

.output {
  margin: 0 12px 12px;
}

#outputBox {
  margin: 0;
  background: #0b1220;
  color: #dbeafe;
  border-radius: 6px;
  padding: 10px;
  max-height: 320px;
  overflow: auto;
  font-size: 12px;
}

@media (max-width: 1600px) {
  .grid {
    grid-template-columns: repeat(2, minmax(280px, 1fr));
  }
}

@media (max-width: 900px) {
  .grid {
    grid-template-columns: 1fr;
  }
}