/* =========================================================
   PAGE 02 — PIANO INTERVALS
   One function only: choose an interval visually.
   ========================================================= */

.piano-interval-tool{
  padding:16px;
  border:1px solid var(--tl-line,#596163);
  border-radius:14px;
  background:
    linear-gradient(180deg,rgba(255,255,255,.018),rgba(255,255,255,0)),
    var(--tl-panel-2,#383e40);
  color:var(--tl-cream,#eadfc8);
}

.piano-toolbar{
  display:flex;
  justify-content:space-between;
  align-items:end;
  gap:18px;
  margin-bottom:12px;
}

.tonic-control{
  display:grid;
  gap:6px;
}

.tonic-control>span{
  color:var(--tl-muted,#aea491);
  font-size:.70rem;
  font-weight:700;
}

.tonic-control select{
  min-width:150px;
  min-height:42px;
  padding:8px 11px;
  border:1px solid var(--tl-line,#596163);
  border-radius:8px;
  background:var(--tl-panel,#303638);
  color:var(--tl-cream,#eadfc8);
  color-scheme:dark;
  outline:none;
  font:inherit;
  font-size:.94rem;
  font-weight:800;
}

.tonic-control select:focus{
  border-color:var(--tl-copper,#a56f50);
}

.interval-now{
  display:flex;
  gap:11px;
  align-items:center;
  text-align:right;
}

.interval-now>span{
  color:var(--tl-copper-2,#bf8060);
  font-size:2.25rem;
  line-height:1;
  font-weight:900;
}

.interval-now>div{
  display:grid;
  gap:3px;
}

.interval-now strong{
  color:var(--tl-cream,#eadfc8);
  font-size:1.12rem;
  font-weight:900;
}

.interval-now small{
  color:var(--tl-cream-2,#d5c8af);
  font-size:.71rem;
}

/* ---------- keyboard panel ---------- */

.piano-panel{
  padding:14px 14px 11px;
  border:1px solid var(--tl-line,#596163);
  border-radius:11px;
  background:var(--tl-panel,#303638);
}

.piano-head{
  display:grid;
  gap:3px;
  margin-bottom:10px;
}

.piano-head span{
  color:var(--tl-muted,#aea491);
  font-size:.67rem;
}

.piano-head strong{
  color:var(--tl-cream,#eadfc8);
  font-size:.96rem;
  font-weight:850;
}

/* Real-piano style analytical keyboard */
.interval-piano{
  position:relative;
  height:255px;
  overflow:hidden;
  border:1px solid #777066;
  border-radius:7px 7px 4px 4px;
  background:#2d3132;
  user-select:none;
}

.white-keys{
  position:absolute;
  inset:0;
  display:flex;
  z-index:1;
}

.piano-key.white{
  position:relative;
  flex:1 1 0;
  height:100%;
  padding:0;
  border:0;
  border-right:1px solid #868179;
  background:
    linear-gradient(
      90deg,
      #d8d0c1 0%,
      #eee7da 15%,
      #f4eee4 70%,
      #cfc7b8 100%
    );
  color:#17191a;
  cursor:pointer;
}

.piano-key.white:last-child{
  border-right:0;
}

.piano-key.black{
  position:absolute;
  top:0;
  width:4.55%;
  height:62%;
  padding:0;
  border:1px solid #080a0a;
  border-top:0;
  border-radius:0 0 5px 5px;
  transform:translateX(-50%);
  background:
    linear-gradient(
      90deg,
      #070909 0%,
      #1b2020 24%,
      #373d3d 50%,
      #1d2222 76%,
      #070909 100%
    );
  color:#f1eade;
  box-shadow:0 7px 9px rgba(0,0,0,.43);
  z-index:3;
  cursor:pointer;
}

.piano-key .note-label{
  position:absolute;
  left:50%;
  bottom:11px;
  transform:translateX(-50%);
  font-size:.74rem;
  font-weight:900;
  white-space:nowrap;
}

.piano-key.black .note-label{
  bottom:10px;
  font-size:.62rem;
}

.piano-key.outside-range{
  opacity:.35;
  filter:saturate(.38);
  cursor:default;
}

.piano-key.tonic-key::after{
  content:attr(data-tonic-label);
  position:absolute;
  left:50%;
  bottom:34px;
  transform:translateX(-50%);
  padding:2px 6px;
  border:1px solid #584238;
  border-radius:3px;
  background:#6d5548;
  color:#f1e7d4;
  font-size:.49rem;
  font-weight:900;
  letter-spacing:.05em;
  white-space:nowrap;
}

.piano-key.black.tonic-key::after{
  bottom:30px;
}

.piano-key.selected-key{
  box-shadow:inset 0 -7px 0 var(--tl-copper-2,#bf8060);
}

.piano-key.black.selected-key{
  box-shadow:
    inset 0 -6px 0 var(--tl-copper-2,#bf8060),
    0 7px 9px rgba(0,0,0,.43);
}

/* ---------- interval bracket ---------- */

.interval-bracket-zone{
  position:relative;
  height:68px;
  margin-top:2px;
}

.interval-bracket{
  position:absolute;
  top:10px;
  height:25px;
}

.interval-bracket .line{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  background:var(--tl-copper-2,#bf8060);
}

.interval-bracket .cap{
  position:absolute;
  bottom:0;
  width:2px;
  height:12px;
  background:var(--tl-copper-2,#bf8060);
}

.interval-bracket .cap.left{left:0}
.interval-bracket .cap.right{right:0}

.interval-bracket .label{
  position:absolute;
  left:50%;
  bottom:15px;
  min-width:190px;
  transform:translateX(-50%);
  display:grid;
  gap:1px;
  padding:5px 9px;
  border:1px solid var(--tl-line,#596163);
  border-radius:5px;
  background:var(--tl-panel,#303638);
  text-align:center;
  white-space:nowrap;
}

.interval-bracket .label strong{
  color:var(--tl-cream,#eadfc8);
  font-size:.79rem;
  font-weight:850;
}

.interval-bracket .label small{
  color:var(--tl-cream-2,#d5c8af);
  font-size:.66rem;
}

@media(max-width:800px){
  .interval-piano{
    height:210px;
  }
}

@media(max-width:620px){
  .piano-toolbar{
    align-items:flex-start;
    flex-direction:column;
  }

  .interval-now{
    text-align:left;
  }

  .interval-piano{
    height:180px;
  }

  .piano-key.black .note-label{
    display:none;
  }
}


/* =========================================================
   NATURAL vs 12-TET comparison table
   ========================================================= */

.interval-comparison{
  margin-top:12px;
  padding:14px;
  border:1px solid var(--tl-line,#596163);
  border-radius:11px;
  background:var(--tl-panel,#303638);
}

.comparison-head{
  display:flex;
  justify-content:space-between;
  gap:16px;
  align-items:end;
  margin-bottom:10px;
}

.comparison-head>div{
  display:grid;
  gap:3px;
}

.comparison-head span,
.comparison-head small{
  color:var(--tl-muted,#aea491);
  font-size:.66rem;
}

.comparison-head strong{
  color:var(--tl-cream,#eadfc8);
  font-size:.98rem;
  font-weight:850;
}

.comparison-table-wrap{
  overflow-x:auto;
}

.comparison-table{
  width:100%;
  border-collapse:collapse;
  table-layout:fixed;
}

.comparison-table th,
.comparison-table td{
  padding:9px 10px;
  border-bottom:1px solid rgba(231,217,186,.10);
  text-align:right;
  white-space:nowrap;
}

.comparison-table th:first-child,
.comparison-table td:first-child{
  text-align:left;
  width:28%;
}

.comparison-table th{
  color:var(--tl-muted,#aea491);
  font-size:.64rem;
  font-weight:800;
}

.comparison-table td{
  color:var(--tl-cream-2,#d5c8af);
  font-size:.72rem;
}

.comparison-table td.interval-cell{
  color:var(--tl-cream,#eadfc8);
  font-weight:800;
}

.comparison-table td.ratio-cell{
  color:var(--tl-copper-2,#bf8060);
  font-weight:800;
}

.comparison-table td.delta-positive{
  color:#d8a07c;
  font-weight:850;
}

.comparison-table td.delta-negative{
  color:#c5cfd0;
  font-weight:850;
}

.comparison-table td.delta-zero{
  color:var(--tl-muted,#aea491);
  font-weight:800;
}

.comparison-table tr.is-selected td{
  background:rgba(165,111,80,.10);
}

.comparison-table tr.is-selected td:first-child{
  box-shadow:inset 3px 0 0 var(--tl-copper-2,#bf8060);
  color:#fff0d9;
}

.comparison-table tr:last-child td{
  border-bottom:0;
}

/* ---------- description ---------- */

.interval-description{
  margin-top:10px;
  overflow:hidden;
  border:1px solid var(--tl-line,#596163);
  border-radius:9px;
  background:var(--tl-panel,#303638);
}

.interval-description summary{
  display:flex;
  align-items:center;
  gap:12px;
  padding:11px 13px;
  list-style:none;
  cursor:pointer;
}

.interval-description summary::-webkit-details-marker{
  display:none;
}

.interval-description summary>span{
  color:var(--tl-cream,#eadfc8);
  font-size:.77rem;
  font-weight:850;
}

.interval-description summary>small{
  margin-left:auto;
  color:var(--tl-muted,#aea491);
  font-size:.62rem;
}

.interval-description summary::after{
  content:"+";
  color:var(--tl-copper-2,#bf8060);
  font-weight:900;
}

.interval-description[open] summary::after{
  content:"−";
}

.interval-description-body{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:8px;
  padding:10px 13px 13px;
  border-top:1px solid rgba(255,255,255,.05);
}

.interval-description-body p{
  margin:0;
  color:var(--tl-cream-2,#d5c8af);
  font-size:.70rem;
  line-height:1.5;
}

@media(max-width:760px){
  .comparison-table{
    min-width:680px;
  }

  .interval-description-body{
    grid-template-columns:1fr;
  }
}


/* =========================================================
   SELECTED INTERVAL ONLY
   ========================================================= */

.interval-comparison.selected-only{
  padding:13px 14px;
}

.selected-comparison-row{
  display:grid;
  grid-template-columns:1.45fr .72fr .82fr .82fr .82fr;
  gap:7px;
}

.selected-compare-cell{
  display:grid;
  gap:4px;
  min-width:0;
  padding:10px 11px;
  border:1px solid rgba(231,217,186,.10);
  border-radius:8px;
  background:rgba(255,255,255,.014);
}

.selected-compare-cell>span{
  color:var(--tl-muted,#aea491);
  font-size:.62rem;
  font-weight:700;
}

.selected-compare-cell>strong{
  color:var(--tl-cream,#eadfc8);
  font-size:.92rem;
  font-weight:850;
  white-space:nowrap;
}

.selected-compare-cell>small{
  color:var(--tl-cream-2,#d5c8af);
  font-size:.64rem;
}

.selected-compare-cell.interval{
  border-left:3px solid var(--tl-copper-2,#bf8060);
}

.selected-compare-cell.delta strong{
  color:var(--tl-copper-2,#bf8060);
}

#selectedCompareNote{
  color:var(--tl-copper-2,#bf8060);
  font-size:.72rem;
  font-weight:800;
}

@media(max-width:820px){
  .selected-comparison-row{
    grid-template-columns:1.35fr repeat(2,1fr);
  }

  .selected-compare-cell:nth-child(4),
  .selected-compare-cell:nth-child(5){
    grid-column:auto;
  }
}

@media(max-width:560px){
  .selected-comparison-row{
    grid-template-columns:1fr 1fr;
  }

  .selected-compare-cell.interval{
    grid-column:1/-1;
  }
}


/* =========================================================
   READABILITY — PAGE 02 DESCRIPTION
   Approx. 125% text size while keeping page geometry at 100%.
   ========================================================= */

.interval-description summary>span{
  font-size:.88rem;
}

.interval-description summary>small{
  font-size:.70rem;
}

.interval-description-body p{
  font-size:.88rem;
  line-height:1.58;
}

/* Slightly more breathing room for larger reading text */
.interval-description-body{
  gap:14px;
}

@media(max-width:760px){
  .interval-description-body p{
    font-size:.90rem;
  }
}