.tzo-toc {
  padding-top: 10px;

  li {
    margin: 9px 0;
  }
}

.tzo-text {
  //padding: 10px 0 0;

  p, center {
    margin-top: 15px;
    margin-bottom: 15px;
    //font-family: serif;
  }

  p.tzo-chapter {
    text-align: center;
    font-weight: bold;
    font-size: $fs + 2px;
  }

  img {
    display: block;
    max-width: 100%;
    height: auto;
  }

  .tzo-nav {
    line-height: 140%;
    text-align: center;
    > span {
      color: $light-grey;
    }
  }
}

.ic-books {
  ul:last-child {
    li:last-child {
      margin-bottom: 0;
    }
    margin-bottom: 0;
  }
}

.tzo-map {
  $cell: 14.2857%; // 100% / 7
  $node-size: 12.5%; // circle diameter
  $radius-offset: ($node-size/2) * 0.7071067811865476; // (node-size/2) * sqrt(2)/2
  $diag: $cell * 1.41421356; // cell × sqrt(2)
  $inner-circle-size: 0px;
  $node-border-size: 2px;
  $node-border-color: $head-items-border;
  $node-border-color-hover: $head-items-hover-border;

  position: relative;
  width: 100%;
  max-width: 700px;
  aspect-ratio: 1 / 1;
  margin: 15px auto;

  .node {
    position: absolute;
    width: $node-size;
    height: $node-size;
    background: $hover-hl;
    border-radius: 50%;
    color: $fg;
    text-decoration: none;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    @include no-underline();

    /* center on its left/top */
    transform: translate(-50%, -50%);
    z-index: 3;

    &-number {
      font-weight: bold;
      line-height: 100%;
    }
    &-label {
      color: $light-grey;
    }

    @media screen and (max-width: 600px) {
      &-number, &-label { font-size: $fs - 2px; }
    }
    @media screen and (max-width: 450px) {
      &-number, &-label { font-size: $fs - 4px; }
      &-label { line-height: $fs; }
    }
    @media screen and (max-width: 380px) {
      &-label { display: none; }
    }
  }
  .node:hover {
    background: $hover-hl-darker;
    .node-number, .node-label {
      color: $fg;
      opacity: 1;
    }
  }

  /* ── ARROWS ────────────────────────────────────────── */
  .arrow {
    position: absolute;
    width: calc((#{$diag} - #{$node-size}) - 12px);
    height: 0;
    border-top: $node-border-size solid $node-border-color;

    /* start at 0,0 and then translate+rotate */
    transform-origin: 0 0;
    z-index: 2;
  }
  .arrow::after {
    content: "";
    position: absolute;
    left: 100%;
    top: -6px;
    border-left: 11px solid $node-border-color;
    border-top: 5px solid transparent;
    border-bottom: 5px solid transparent;
  }

  .dir45 {
    margin-left: $radius-offset;
    margin-top: $radius-offset;
    transform: rotate(45deg);
  }
  .dir135 {
    margin-left: -1 * $radius-offset;
    margin-top: $radius-offset;
    transform: rotate(135deg);
  }

  /* ── NODE POSITIONS (col,row) = (1…7,1…7) ────────── */
  /* left = cell*(col−0.5), top = cell*(row−0.5) */
  #n1   { left: $cell * 3.5; top: $cell * 0.5; }
  #n21  { left: $cell * 2.5; top: $cell * 1.5; }
  #n22  { left: $cell * 4.5; top: $cell * 1.5; }
  #n31  { left: $cell * 1.5; top: $cell * 2.5; }
  #n32  { left: $cell * 3.5; top: $cell * 2.5; }
  #n33  { left: $cell * 5.5; top: $cell * 2.5; }
  #n41  { left: $cell * 0.5; top: $cell * 3.5; }
  #n42  { left: $cell * 2.5; top: $cell * 3.5; }
  #n43  { left: $cell * 4.5; top: $cell * 3.5; }
  #n44  { left: $cell * 6.5; top: $cell * 3.5; }
  #n51  { left: $cell * 1.5; top: $cell * 4.5; }
  #n52  { left: $cell * 3.5; top: $cell * 4.5; }
  #n53  { left: $cell * 5.5; top: $cell * 4.5; }
  #n61  { left: $cell * 2.5; top: $cell * 5.5; }
  #n62  { left: $cell * 4.5; top: $cell * 5.5; }
  #n7   { left: $cell * 3.5; top: $cell * 6.5; }

  /* ── ARROW ORIGINS: exactly at the *center* of each “from” node ── */
  .a1-21, .a1-22   { left: $cell * 3.5; top: $cell * 0.5; }
  .a21-31, .a21-32 { left: $cell * 2.5; top: $cell * 1.5; }
  .a22-32, .a22-33 { left: $cell * 4.5; top: $cell * 1.5; }
  .a31-41, .a31-42 { left: $cell * 1.5; top: $cell * 2.5; }
  .a32-42, .a32-43 { left: $cell * 3.5; top: $cell * 2.5; }
  .a33-43, .a33-44 { left: $cell * 5.5; top: $cell * 2.5; }
  .a41-51          { left: $cell * 0.5; top: $cell * 3.5; }
  .a42-51, .a42-52 { left: $cell * 2.5; top: $cell * 3.5; }
  .a43-52, .a43-53 { left: $cell * 4.5; top: $cell * 3.5; }
  .a44-53          { left: $cell * 6.5; top: $cell * 3.5; }
  .a51-61          { left: $cell * 1.5; top: $cell * 4.5; }
  .a52-61, .a52-62 { left: $cell * 3.5; top: $cell * 4.5; }
  .a53-62          { left: $cell * 5.5; top: $cell * 4.5; }
  .a61-7           { left: $cell * 2.5; top: $cell * 5.5; }
  .a62-7           { left: $cell * 4.5; top: $cell * 5.5; }
}

.index-title {
  text-align: center;
  font-size: $fs + 6px;
  font-weight: normal;
}
.index-subtitle {
  text-align: center;
  color: $grey;
  padding-top: 4px;
}

//.index-hr {
//  margin: 15px 0;
//  text-align: center;
//  color: $light-grey;
//}
.index-more {
  text-align: center;
  padding-top: 5px;
}