* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

body {
  padding: 1rem;
}

.diagram {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) minmax(160px, 1fr) 1rem minmax(80px, 0.5fr) minmax(80px, 0.5fr) 1rem minmax(160px, 1fr);
  grid-template-rows: auto auto auto auto auto;
  grid-template-areas:
    "a b b b c c c"
    "d e f g g h i"
    "d q r s t u i"
    "d j k l l m i"
    "n o o o p p p";
  gap: 0.5rem;

  .layout-assumptions-req1        { grid-area: b; }
  .layout-assumptions-obj1        { grid-area: c; }
  .layout-assumptions-conflict    { grid-area: d; }
  .layout-req1                    { grid-area: e; }
  .layout-objective-requirement-1 { grid-area: f; }
  .layout-obj1                    { grid-area: g; }
  .layout-goal-objective-1        { grid-area: h; }
  .layout-goal                    { grid-area: i; }
  .layout-conflict                { grid-area: q; }
  .layout-req2                    { grid-area: j; }
  .layout-objective-requirement-2 { grid-area: k; }
  .layout-obj2                    { grid-area: l; }
  .layout-goal-objective-2        { grid-area: m; }
  .layout-assumptions-req2        { grid-area: o; }
  .layout-assumptions-obj2        { grid-area: p; }
}

#main-diagram {
  margin: 3rem 0;
}

p {
  line-height: 1.5;
}

input {
  border: 1px solid #ccc;
  border-radius: 3px;
  width: 100%;
  padding: 0.2rem 0.4rem;
}

.align-middle { align-self: center }
.align-bottom { align-self: end }
.align-top    { align-self: start }

.flex { display: flex }
.flex-spread { justify-content: space-between }
.grow { flex-grow: 1 }

.pointer { cursor: pointer }

.box {
  display: flex;
  border: 1px solid #ccc;
  align-self: stretch;
  flex-direction: column;
  justify-content: center;
  padding: 0.5rem;
  text-align: center;
  min-height: 2rem;
  border-radius: 6px;
}

.labeled {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;

  .labeled__label {
    font-size: 10pt;
    text-align: left;
    color: gray;
    margin-bottom: 0.5rem;
  }

  .labeled__content {
    flex-grow: 1;

    & > :first-child {
      height: 100%;
    }
  }
}

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

.invalidations {
  padding-left: 1.5rem;
}

.connector {
  display: flex;
  align-self: center;
  justify-content: center;
  text-align: center;
}

.btn-danger { color: red; }
.btn-secondary {
  background-color: transparent;
  border: none;
}