:root{
  --bg:#0b0c10;
  --panel:#ffffff;
  --panel2:#f5f7fb;
  --text:#111;
  --muted:#4b5563;
  --sel:#22c55e;
  --hover:#60a5fa;
  --tile:#fefefe;
  --tileTop:#eab308;
  --tileBorder:#111;
  --marker:#111827;
  --markerHover:#2563eb;
  --markerSel:#16a34a;
  --shadow:0 8px 30px rgba(0,0,0,.12);
  --radius:14px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--sans);
  background: linear-gradient(180deg, #0b0c10 0%, #101827 45%, #0b0c10 100%);
  color:#e5e7eb;
}

.topbar{
  position:sticky;
  top:0;
  z-index:20;
  display:flex;
  gap:16px;
  align-items:end;
  justify-content:space-between;
  padding:18px 18px;
  backdrop-filter: blur(12px);
  background: rgba(10, 12, 18, .66);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.brand__title{font-weight:800; font-size:18px; letter-spacing:.2px}
.brand__subtitle{color:rgba(229,231,235,.7); font-size:13px; margin-top:2px}

.controls{display:flex; gap:12px; align-items:center; flex-wrap:wrap}
.control{display:flex; gap:10px; align-items:center; font-size:13px; color:rgba(229,231,235,.8)}
.control input[type="search"]{
  width:min(380px, 60vw);
  padding:10px 12px;
  border-radius:10px;
  border:1px solid rgba(255,255,255,.12);
  outline:none;
  background: rgba(255,255,255,.06);
  color:#fff;
}
.control input[type="search"]:focus{border-color: rgba(96,165,250,.7); box-shadow: 0 0 0 3px rgba(96,165,250,.25)}
.control.checkbox{gap:8px}

.layout{
  width:min(1200px, 100%);
  margin:0 auto;
  padding:18px;
  display:grid;
  grid-template-columns: 1.35fr 1fr;
  grid-template-areas:
    "left table"
    "footer footer";
  column-gap:16px;
  row-gap:12px;
  align-items:start;
}

.leftCol{
  grid-area:left;
  display:flex;
  flex-direction:column;
  gap:0;
}

.panel--chart{
  border-bottom-left-radius:0;
  border-bottom-right-radius:0;
}
.panel--table{grid-area:table; align-self:start}
.panel--details{
  border-top-left-radius:0;
  border-top-right-radius:0;
}

.panel{
  background: var(--panel);
  color: var(--text);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow:hidden;
}
.panel--dark{
  background: #000;
  color:#fff;
}
.panel--details{
  position:relative;
}
.panel__head{
  padding:14px 14px 0 14px;
}
.panel__head h2{margin:0; font-size:15px; color:inherit}
.panel__hint{margin:6px 0 12px 0; font-size:12px; color: rgba(17,24,39,.65)}
.panel--dark .panel__hint{color: rgba(229,231,235,.7)}

/* Tile chart */
.tileChart{
  position:relative;
  padding:14px;
}

/* A fixed "vowel mouth diagram" stage (we scale it responsively) */
.tileStage{
  position:relative;
  width:100%;
  aspect-ratio: 520 / 360;
  background:#fff;
  border:1px solid #e5e7eb;
  border-radius: 10px;
  overflow:hidden;
}
.tileStage::before{
  content:"";
  position:absolute;
  inset:0;
  background: linear-gradient(180deg, #ffffff 0%, #fafafa 100%);
  pointer-events:none;
}

.tile{
  position:absolute;
  user-select:none;
  cursor:pointer;
  width:44px;
  border-radius: 0;
  border:2px solid rgba(0,0,0,.8);
  background: var(--tile);
  color:#000;
  box-shadow:none;
  overflow:hidden;
  display:flex;
  flex-direction:column;
}

/* Background quad inside the stage */
.stageSvg{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
}
.stageSvg .guide,
.stageSvg .slot-grid-line{pointer-events:none}
.stageSvg .guide{opacity:.92}
.stageSvg .slot-grid-line{
  stroke:#6b7280;
  stroke-opacity:.7;
  stroke-width:1.5;
}
.tile__top{
  background: var(--tileTop);
  padding:4px 6px;
  font-family: var(--mono);
  font-weight:800;
  font-size:14px;
  line-height:1;
}
.tile__bot{
  padding:6px 6px;
  font-size:12px;
  line-height:1.05;
  display:flex;
  flex-direction:column;
  gap:3px;
}
.tile--wide{width: 92px}
.tile--wide2{width: 140px}

.tile.is-hover{outline:3px solid rgba(96,165,250,.85); outline-offset:2px; z-index:2}
.tile.is-selected{outline:3px solid rgba(34,197,94,.9); outline-offset:2px; z-index:3}

.tile__play{
  position:absolute;
  right:4px;
  top:4px;
  width:22px;
  height:22px;
  border-radius:999px;
  border:1px solid rgba(0,0,0,.35);
  background: rgba(255,255,255,.92);
  font: 900 11px var(--sans);
  line-height: 20px;
  text-align:center;
  cursor:pointer;
}
.tile__play:hover{background:#fff}

/* Table */
.tableWrap{padding:0 14px 14px 14px; overflow:auto}
.refTable{width:100%; border-collapse:collapse; font-size:13px}
.refTable thead th{
  position:sticky;
  top:0;
  background: var(--panel2);
  border-bottom:1px solid #e5e7eb;
  padding:10px 10px;
  text-align:left;
}
.refTable tbody td{border-bottom:1px solid #eef2f7; padding:10px 10px; vertical-align:top}
.refTable tbody tr{cursor:pointer}
.refTable tbody tr:hover{background:#f8fafc}
.refTable tbody tr.is-selected{background: rgba(34,197,94,.13)}
.refTable code{font-family:var(--mono)}

/* Quad (merged into tile stage as an SVG background) */
.quad__svg{width:100%; height:auto; display:block}
.quad__label{
  fill:#111827;
  pointer-events:none;
}
.quad__label--zone{
  font: 700 15px var(--sans);
  opacity:.92;
}
.quad__label--axis{
  font: 700 14px var(--sans);
  opacity:.88;
}

.vowel-node{cursor:pointer; outline:none}
.vowel-node__dot{
  fill:#ffffff;
  stroke:var(--marker);
  stroke-width:1.6;
}
.vowel-node__ipa{
  font-family: var(--mono);
  font-weight:800;
  font-size:11px;
  text-anchor:middle;
  dominant-baseline:middle;
  fill:var(--marker);
  pointer-events:none;
}
.vowel-node__word{
  font-family: var(--sans);
  font-weight:600;
  font-size:10px;
  text-anchor:middle;
  fill:#4b5563;
  pointer-events:none;
}
.vowel-node.is-hover .vowel-node__dot{
  stroke:var(--markerHover);
  stroke-width:3;
}
.vowel-node.is-selected .vowel-node__dot{
  stroke:var(--markerSel);
  stroke-width:3;
  fill:#ecfdf5;
}

/* Details */
.card{padding:14px}
.card__empty{color:rgba(17,24,39,.6); font-size:13px}
.card__sym{font-size:38px; font-family:var(--mono); font-weight:900; letter-spacing:-.02em}
.card__row{margin-top:8px; display:flex; gap:10px; align-items:baseline; flex-wrap:wrap}
.badge{display:inline-flex; gap:8px; align-items:center; background:#f3f4f6; border:1px solid #e5e7eb; padding:6px 8px; border-radius:999px; font-size:12px; color:#111}
.badge code{font-family:var(--mono); font-weight:800}
.card__section{margin-top:12px}
.card__section h3{margin:0 0 6px 0; font-size:13px; color:#111}
.card__list{margin:0; padding-left:16px; color:#111; font-size:13px}
.playRow{display:flex; gap:10px; flex-wrap:wrap}
.play{
  font: 700 12px var(--sans);
  padding:6px 10px;
  border-radius:999px;
  border:1px solid #d1d5db;
  background:#fff;
  cursor:pointer;
}
.play:hover{background:#f3f4f6}
.play.is-disabled{opacity:.5; cursor:not-allowed}
.exWord{font-weight:700}

.legend{padding:0 14px 14px 14px; display:flex; gap:12px; flex-wrap:wrap; color: rgba(17,24,39,.65); font-size:12px}
.panel--sticky .legend{color: rgba(17,24,39,.65)}
.swatch{display:inline-block; width:12px; height:12px; border-radius:3px; border:2px solid #111; margin-right:6px; vertical-align:-2px}
.swatch--sel{outline:3px solid rgba(34,197,94,.9)}
.swatch--hover{outline:3px solid rgba(96,165,250,.85)}

.footer{
  grid-area: footer;
  padding:12px 8px 22px 8px;
  color: rgba(229,231,235,.7);
  font-size:12px;
  text-align:center;
}
.footer code{font-family:var(--mono)}

/* Tooltip */
.tooltip{
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  padding: 8px 10px;
  border-radius: 10px;
  background: rgba(17,24,39,.96);
  color:#fff;
  border: 1px solid rgba(255,255,255,.16);
  box-shadow: 0 12px 30px rgba(0,0,0,.4);
  font-size: 12px;
  max-width: 260px;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .12s ease, transform .12s ease;
}
.tooltip[data-show="1"]{opacity: 1; transform: translateY(0)}
.tooltip__sym{font-family:var(--mono); font-weight:900; font-size:14px}
.tooltip__ex{opacity:.9; margin-top:4px}

@media (max-width: 980px){
  .layout{
    grid-template-columns:1fr;
    grid-template-areas:
      "left"
      "table"
      "footer";
    row-gap:16px;
  }
  .leftCol{gap:16px}
  .panel--chart,
  .panel--details{
    border-radius: var(--radius);
  }
  .panel--details{position:relative}
  .tileGrid{grid-template-columns: repeat(10, 44px)}
}