/* Seamlessifier — dark studio UI */
:root {
  --bg: #15171c;
  --panel: #1d2027;
  --panel-2: #23262f;
  --line: #313640;
  --text: #d7dbe2;
  --muted: #8b919e;
  --accent: #4f9dff;
  --accent-2: #2f6fd0;
  --good: #57c98a;
  --danger: #e0604f;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 13px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  display: flex; flex-direction: column;
  overflow: hidden;
}

/* ---- top bar ---- */
.topbar {
  display: flex; align-items: center; gap: 18px;
  padding: 8px 14px; background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: baseline; gap: 8px; }
.logo { color: var(--accent); font-size: 18px; }
.title { font-weight: 700; letter-spacing: .3px; }
.subtitle { color: var(--muted); font-size: 11px; }
.tabs { display: flex; gap: 4px; }
.tab {
  background: transparent; color: var(--muted); border: 0;
  padding: 6px 14px; border-radius: 6px; cursor: pointer; font-size: 13px;
}
.tab:hover { color: var(--text); background: var(--panel-2); }
.tab.active { color: #fff; background: var(--accent-2); }
.topbar-actions { margin-left: auto; display: flex; gap: 8px; }

/* ---- buttons ---- */
.btn {
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--line); border-radius: 6px;
  padding: 7px 12px; cursor: pointer; font-size: 13px;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent-2); border-color: var(--accent-2); color: #fff; }
.btn.primary:hover { background: var(--accent); }
.btn.ghost { background: transparent; }
.btn.big { width: 100%; padding: 10px; font-weight: 600; }
.btn.sm { padding: 5px 8px; font-size: 12px; }
.btn.file { display: inline-block; }
kbd { background: var(--panel-2); border: 1px solid var(--line); border-radius: 4px; padding: 1px 6px; font-size: 11px; }

/* ---- workspace layout ---- */
.workspace { flex: 1; display: flex; min-height: 0; }
.panel { flex: 1; display: flex; min-width: 0; }
.panel.hidden { display: none; }

.stage { flex: 1; display: flex; flex-direction: column; min-width: 0; padding: 12px; gap: 10px; }
.stage-toolbar { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.hint { color: var(--muted); font-size: 12px; }

.canvas-wrap {
  flex: 1; position: relative; background:
    repeating-conic-gradient(#202329 0% 25%, #1a1d22 0% 50%) 50% / 22px 22px;
  border: 1px solid var(--line); border-radius: 8px; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.canvas-wrap canvas { max-width: 100%; max-height: 100%; touch-action: none; }
.canvas-wrap.drop-hover,
.library.drop-hover,
.seam-previews.drop-hover {
  outline: 2px dashed var(--accent);
  outline-offset: -3px;
}
.placeholder {
  position: absolute; color: var(--muted); pointer-events: none; font-size: 14px;
}

/* ---- controls panel ---- */
.controls {
  width: 280px; flex-shrink: 0; background: var(--panel);
  border-left: 1px solid var(--line); padding: 14px; overflow-y: auto;
}
.controls h3 { margin: 4px 0 8px; font-size: 12px; text-transform: uppercase; letter-spacing: .6px; color: var(--muted); }
.controls h4 { margin: 14px 0 6px; font-size: 12px; color: var(--muted); }
.controls hr { border: 0; border-top: 1px solid var(--line); margin: 14px 0; }
.row { display: flex; align-items: center; justify-content: space-between; margin: 6px 0; }
.row label { color: var(--muted); }
.row input { width: 90px; }
.row select { width: 120px; }
input[type="number"], select {
  background: var(--panel-2); color: var(--text); border: 1px solid var(--line);
  border-radius: 5px; padding: 5px 7px;
}
select { width: 100%; }
.check { display: flex; align-items: center; gap: 7px; margin: 8px 0; color: var(--muted); cursor: pointer; }
.muted { color: var(--muted); font-size: 12px; }
.slider { margin: 10px 0; }
.slider label { display: flex; justify-content: space-between; color: var(--muted); margin-bottom: 4px; }
.slider b { color: var(--accent); }
input[type="range"] { width: 100%; accent-color: var(--accent); }

.preview-square { width: 100%; aspect-ratio: 1/1; background: #111; border: 1px solid var(--line); border-radius: 6px; image-rendering: pixelated; }
.preview-square.big { }
.preview-fit {
  width: 100%; height: auto; max-height: 256px; display: block;
  background: #111; border: 1px solid var(--line); border-radius: 6px;
  image-rendering: pixelated; object-fit: contain;
}

/* ---- seamless previews ---- */
.seam-previews { flex: 1; display: grid; grid-template-columns: 1fr 1fr; gap: 14px; min-height: 0; }
.seam-previews > div { display: flex; flex-direction: column; min-height: 0; }
.cap { color: var(--muted); font-size: 12px; margin-bottom: 6px; }
.seam-previews canvas { flex: 1; min-height: 0; width: 100%; background: #111; border: 1px solid var(--line); border-radius: 6px; image-rendering: pixelated; object-fit: contain; }

/* ---- library ---- */
.library {
  width: 210px; flex-shrink: 0; background: var(--panel);
  border-left: 1px solid var(--line); display: flex; flex-direction: column;
}
.library-head { display: flex; align-items: center; justify-content: space-between; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.library-head h3 { margin: 0; font-size: 12px; text-transform: uppercase; letter-spacing: .6px; color: var(--muted); }
.count { background: var(--panel-2); border-radius: 10px; padding: 1px 8px; font-size: 11px; color: var(--muted); }
.library-grid { flex: 1; overflow-y: auto; padding: 10px; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; align-content: start; }
.lib-item { position: relative; border: 2px solid transparent; border-radius: 6px; cursor: pointer; background: #111; overflow: hidden; }
.lib-item canvas { display: block; width: 100%; aspect-ratio: 1/1; image-rendering: pixelated; }
.lib-item.selected { border-color: var(--accent); }
.lib-item .name { position: absolute; left: 0; right: 0; bottom: 0; font-size: 10px; padding: 2px 4px; background: rgba(0,0,0,.6); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.lib-item .name input {
  width: 100%; font: inherit; color: #fff; background: #111;
  border: 1px solid var(--accent); border-radius: 3px; padding: 1px 3px;
}
.lib-empty {
  grid-column: 1 / -1; color: var(--muted); font-size: 12px;
  text-align: center; padding: 24px 8px;
}
.library-foot { display: flex; gap: 6px; padding: 10px; border-top: 1px solid var(--line); }
.library-foot .btn { flex: 1; }

/* ---- ripper handles drawn on canvas; status bar ---- */
.statusbar { padding: 5px 14px; background: var(--panel); border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }