:root {
  --bg: #09090b;
  --card: #131316;
  --card2: #0d0d10;
  --line: #222329;
  --line2: #2c2d34;
  --fg: #ececf1;
  --dim: #71727a;
  --accent: #b9c6fb;
  --on-accent: #14151c;
  --danger: #ff6a57;
  --r-card: 16px;
  --r-el: 9px;
  --mono: "SF Mono", Menlo, "Roboto Mono", Consolas, monospace;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  background: var(--bg);
  background-image: radial-gradient(#1a1b20 1px, transparent 1.2px);
  background-size: 24px 24px;
  color: var(--fg);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .04em;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  user-select: none;
  -webkit-user-select: none;
}
input, textarea { user-select: text; -webkit-user-select: text; }

#app {
  display: grid;
  grid-template-columns: 250px 1fr 264px;
  grid-template-rows: auto 1fr 18px;
  grid-template-areas:
    "top top top"
    "left stage right"
    "status status status";
  gap: 14px;
  height: 100vh;
  padding: 14px 14px 8px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-card);
}
.card.pad { padding: 14px; }
.card.grow { flex: 1; min-height: 0; display: flex; flex-direction: column; }

.sec-label {
  font-size: 9px; letter-spacing: .18em; color: var(--dim);
  margin-bottom: 12px;
}
.dim { color: var(--dim); }
.center { text-align: center; line-height: 1.7; padding: 24px 12px; }

/* ---------- controls ---------- */

.btn {
  font: inherit; font-size: 10px; color: var(--fg);
  background: var(--card2);
  border: 1px solid var(--line);
  border-radius: var(--r-el);
  padding: 8px 12px;
  cursor: pointer;
  letter-spacing: .1em;
  transition: border-color .12s, background .12s, filter .12s;
  white-space: nowrap;
}
.btn:hover { border-color: var(--line2); background: #17181c; }
.btn.pill { border-radius: 999px; padding: 8px 16px; }
.btn.primary {
  background: var(--accent); color: var(--on-accent); border-color: var(--accent);
  font-family: var(--sans); font-weight: 600; font-size: 12px; letter-spacing: .02em;
}
.btn.primary:hover { filter: brightness(1.06); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--dim); }
.btn.ghost:hover { color: var(--fg); border-color: var(--line); background: transparent; }
.btn.danger { color: var(--danger); }
.btn.danger:hover { border-color: var(--danger); }
.btn.wide { width: 100%; }
.btn:disabled { opacity: .35; cursor: default; }

.select {
  font: inherit; font-size: 10px; color: var(--fg);
  background: var(--card2);
  border: 1px solid var(--line);
  border-radius: var(--r-el);
  padding: 7px 8px;
}
.toggle { display: flex; align-items: center; gap: 6px; cursor: pointer; color: var(--dim); }
.toggle input { accent-color: var(--accent); }
.toggle input:checked + span { color: var(--fg); }

.kbd {
  font-size: 9px; color: var(--dim);
  background: var(--card2);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 2px 7px;
}

/* tick sliders (reference style: bar of vertical dashes, filled part bright) */
input[type=range].tick {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 26px;
  border-radius: var(--r-el);
  background:
    repeating-linear-gradient(90deg, var(--fg) 0 2px, transparent 2px 7px) 8px 50% / calc((100% - 16px) * var(--p, 1)) 12px no-repeat,
    repeating-linear-gradient(90deg, #34353d 0 2px, transparent 2px 7px) 8px 50% / calc(100% - 16px) 12px no-repeat,
    var(--card2);
  border: 1px solid var(--line);
  cursor: ew-resize;
}
input[type=range].tick::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 10px; height: 26px;
  background: transparent;
}
input[type=range].tick::-moz-range-thumb {
  width: 10px; height: 26px; border: none; background: transparent;
}

/* ---------- topbar ---------- */
#topbar {
  grid-area: top;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
}
.logo { display: flex; align-items: baseline; gap: 8px; margin-right: 10px; }
.logo-mark { color: var(--accent); font-size: 14px; }
.logo-text { font-weight: 700; letter-spacing: .18em; font-size: 12px; }
.logo-sub { color: var(--dim); font-size: 9px; letter-spacing: .14em; }
.topbar-spacer { flex: 1; }

/* ---------- left panel ---------- */
#left {
  grid-area: left;
  display: flex; flex-direction: column;
  gap: 14px;
  min-height: 0;
}
.tool-row {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--card2);
  border: 1px solid var(--line);
  border-radius: var(--r-el);
  padding: 10px 12px;
  cursor: pointer;
  transition: border-color .12s;
}
.tool-row:hover { border-color: var(--line2); }
.tool-row.active { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.tool-row.active .kbd { background: rgba(0,0,0,.16); border-color: transparent; color: var(--on-accent); }
.tool-row-hint { margin-top: 10px; font-size: 10px; line-height: 1.6; }
.seg-level { margin-top: 8px; }
.greek { fill: #9aa0aa; fill-opacity: .45; }
.greek-acc { fill: #e8452c; fill-opacity: .7; }
.predict-label { fill: var(--accent); }
.tool-row-hint .kbd { padding: 1px 5px; }

.tabs {
  display: flex; gap: 4px;
  background: var(--card2);
  border-bottom: 1px solid var(--line);
  border-radius: var(--r-card) var(--r-card) 0 0;
  padding: 6px;
}
.tab {
  flex: 1; font: inherit; font-size: 10px; letter-spacing: .12em;
  background: transparent; color: var(--dim);
  border: none; border-radius: var(--r-el);
  padding: 8px 0; cursor: pointer;
  transition: background .12s, color .12s;
}
.tab:hover { color: var(--fg); }
.tab.active { color: var(--fg); background: var(--card); box-shadow: inset 0 0 0 1px var(--line2); }
.tab-page { display: none; flex: 1; overflow-y: auto; padding: 12px; min-height: 0; }
.tab-page.active { display: block; }

.tpl-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.tpl-chip {
  border: 1px solid var(--line);
  background: var(--card2);
  border-radius: var(--r-el);
  cursor: pointer;
  padding: 8px;
  transition: border-color .12s, background .12s;
}
.tpl-chip:hover { border-color: var(--line2); }
.tpl-chip.active { border-color: var(--accent); background: #191b24; box-shadow: 0 0 0 1px var(--accent); }
.tpl-chip svg { width: 100%; height: 54px; display: block; }
.tpl-chip .tpl-name {
  display: block; margin-top: 7px;
  font-size: 8px; letter-spacing: .14em; color: var(--dim);
  text-align: center;
}
.tpl-chip.active .tpl-name { color: var(--accent); }

.lib-actions { margin-bottom: 10px; }
.lib-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.lib-chip {
  position: relative;
  border: 1px solid var(--line);
  background: var(--card2);
  border-radius: var(--r-el);
  cursor: pointer; padding: 8px;
  transition: border-color .12s, background .12s;
}
.lib-chip:hover { border-color: var(--line2); }
.lib-chip.active { border-color: var(--accent); background: #191b24; box-shadow: 0 0 0 1px var(--accent); }
.lib-chip img {
  width: 100%; height: 50px; object-fit: contain; display: block;
  filter: brightness(0) invert(1);
}
.lib-chip .lib-del {
  position: absolute; top: 4px; right: 4px;
  display: none;
  background: var(--bg); border: 1px solid var(--line); color: var(--dim);
  border-radius: 6px;
  font: inherit; font-size: 9px; padding: 1px 6px; cursor: pointer;
}
.lib-chip:hover .lib-del { display: block; }
.lib-chip .lib-del:hover { color: var(--danger); border-color: var(--danger); }

/* ---------- stage ---------- */
#stage-wrap {
  grid-area: stage;
  position: relative;
  overflow: hidden;
  background: #0b0b0e;
}
#stage { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
#stage.brush-armed { cursor: crosshair; }
#stage.panning { cursor: grab; }

#ratio-bar {
  position: absolute;
  top: 12px; left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex; gap: 4px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px;
}
#ratio-bar[hidden] { display: none; }
#ratio-bar button {
  font: inherit; font-size: 9px; letter-spacing: .08em;
  color: var(--dim);
  background: transparent;
  border: none; border-radius: 999px;
  padding: 6px 10px;
  cursor: pointer;
  transition: background .12s, color .12s;
}
#ratio-bar button:hover { color: var(--fg); }
#ratio-bar button.active { background: var(--accent); color: var(--on-accent); font-weight: 700; }

.crop-mask { fill: rgba(6,6,8,.62); pointer-events: none; }
.crop-frame { fill: none; stroke: rgba(185,198,251,.55); pointer-events: none; }

#drop-hint {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  pointer-events: none;
  z-index: 2;
}
#drop-hint.hidden { display: none; }
.drop-inner {
  text-align: center; letter-spacing: .2em; line-height: 2;
  color: var(--dim);
  border: 1px dashed var(--line2);
  border-radius: var(--r-card);
  padding: 42px 64px;
}
.drop-icon { font-size: 18px; line-height: 1.1; margin-bottom: 14px; color: var(--fg); }

#stage-wrap.dragover #drop-hint { display: flex; }
#stage-wrap.dragover .drop-inner { border-color: var(--accent); color: var(--fg); }

/* selection visuals (screen-space stroke widths set in JS) */
.rubber { fill: rgba(185,198,251,.08); stroke: var(--accent); stroke-dasharray: 4 3; }
.sel-outline { fill: none; stroke: var(--accent); }
.sel-handle { fill: var(--bg); stroke: var(--accent); }

/* ---------- right panel ---------- */
#right {
  grid-area: right;
  display: flex; flex-direction: column;
  gap: 14px;
  overflow-y: auto;
  min-height: 0;
}
#inspector { display: flex; flex-direction: column; gap: 14px; }
#inspector[hidden] { display: none; }

.insp-row { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.insp-row:last-child { margin-bottom: 0; }
.insp-label { color: var(--dim); font-size: 9px; letter-spacing: .14em; flex: none; }
.insp-slider { margin-bottom: 12px; }
.insp-slider:last-child { margin-bottom: 0; }
.insp-slider-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 6px;
}
.insp-slider-head span:last-child { font-size: 11px; }
.insp-help { font-size: 9px; line-height: 1.7; margin-top: 10px; letter-spacing: .06em; }
.insp-help b { color: var(--fg); font-weight: 400; }

.btn-row { display: flex; gap: 8px; margin-bottom: 8px; }
.btn-row:last-child { margin-bottom: 0; }
.btn-row .btn { flex: 1; }

.seg {
  display: flex; flex: 1; gap: 3px;
  background: var(--card2);
  border: 1px solid var(--line);
  border-radius: var(--r-el);
  padding: 3px;
}
.seg button {
  flex: 1; font: inherit; font-size: 9px; letter-spacing: .1em;
  background: transparent; color: var(--dim);
  border: none; border-radius: 6px;
  padding: 6px 0; cursor: pointer;
  transition: background .12s, color .12s;
}
.seg button:hover { color: var(--fg); }
.seg button.active { background: var(--accent); color: var(--on-accent); font-weight: 700; }

#txt-content {
  width: 100%;
  font: inherit; font-size: 10px; line-height: 1.6;
  color: var(--fg);
  background: var(--card2);
  border: 1px solid var(--line);
  border-radius: var(--r-el);
  padding: 10px;
  resize: vertical;
  margin-bottom: 8px;
  white-space: pre;
}
#txt-content:focus { outline: none; border-color: var(--line2); }

/* ---------- statusbar ---------- */
#statusbar {
  grid-area: status;
  display: flex; justify-content: space-between; align-items: center;
  padding: 0 4px;
  font-size: 9px; letter-spacing: .1em; color: var(--dim);
}

/* scrollbars */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }
::-webkit-scrollbar-track { background: transparent; }