:root {
  --bg: #fbfbfa;
  --panel: #ffffff;
  --panel-2: #f4f4f2;
  --line: #e4e3df;
  --line-strong: #d3d2cc;
  --ink: #1c1c1a;
  --ink-dim: #6b6b64;
  --ink-faint: #9d9c95;
  --accent: #10B981;
  --accent-soft: #ecfdf5;
  --red: #dc2626;
  --radius: 12px;
  --disp: 'Space Grotesk', sans-serif;
  --body: 'IBM Plex Sans', sans-serif;
  --mono: 'IBM Plex Mono', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--ink); font-family: var(--body); }
::selection { background: var(--accent-soft); color: var(--accent); }

.sg-wrap { max-width: 960px; margin: 0 auto; }

.card {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px 22px;
  margin-bottom: 14px; box-shadow: 0 1px 4px rgba(0,0,0,.04);
}

/* ── Source card ──────────────────────────────────────── */
.source-card { padding: 18px 20px; }

.source-row {
  display: flex; align-items: stretch; gap: 0;
  border: 1px solid var(--line); border-radius: 10px; overflow: hidden;
  margin-bottom: 12px;
}

.src-zone, .src-btn {
  flex: 1; padding: 22px 20px; text-align: center; cursor: pointer;
  background: var(--panel); transition: background .15s;
  display: flex; flex-direction: column; align-items: center; gap: 6px;
  border: none; font-family: inherit;
}
.src-zone:hover, .src-btn:hover { background: var(--accent-soft); }
.src-zone.drag-over { background: var(--accent-soft); outline: 2px dashed var(--accent); }
.src-btn.active { background: var(--accent-soft); }
.src-btn.active .src-icon { color: var(--accent); }

.src-icon { font-size: 26px; line-height: 1; }
.src-label { font-family: var(--disp); font-size: 14px; font-weight: 700; color: var(--ink); }
.src-sub { font-family: var(--mono); font-size: 10.5px; color: var(--ink-faint); max-width: 160px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.src-sep {
  width: 44px; flex-shrink: 0; background: var(--panel-2);
  border-left: 1px solid var(--line); border-right: 1px solid var(--line);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--mono); font-size: 11px; font-weight: 700; color: var(--ink-faint);
}

.source-status { font-family: var(--mono); font-size: 11.5px; color: var(--ink-dim); text-align: center; }

@media (max-width: 540px) {
  .source-row { flex-direction: column; }
  .src-sep { width: 100%; height: 32px; border-left: none; border-right: none; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
}

/* ── Controls card ────────────────────────────────────── */
.ctrl-card { padding: 16px 18px; }

.ctrl-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 14px 20px;
}

.ctrl-item { display: flex; flex-direction: column; gap: 6px; }
.ctrl-lbl { font-family: var(--mono); font-size: 10px; letter-spacing: 1px; text-transform: uppercase; color: var(--ink-faint); display: flex; justify-content: space-between; align-items: baseline; }
.ctrl-val { font-size: 12px; font-weight: 700; color: var(--accent); letter-spacing: 0; text-transform: none; }

.ctrl-sel { font-family: var(--mono); font-size: 12px; padding: 7px 10px; border: 1px solid var(--line-strong); border-radius: 7px; background: var(--panel-2); color: var(--ink); cursor: pointer; outline: none; }
.ctrl-sel:focus { border-color: var(--accent); }

.ctrl-range { -webkit-appearance: none; appearance: none; width: 100%; height: 4px; background: var(--line-strong); border-radius: 2px; outline: none; cursor: pointer; }
.ctrl-range::-webkit-slider-thumb { -webkit-appearance: none; width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 2px solid var(--accent); cursor: pointer; }
.ctrl-range::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 2px solid var(--accent); cursor: pointer; }

.toggle-grp { display: flex; border: 1px solid var(--line-strong); border-radius: 7px; overflow: hidden; }
.tog-btn { flex: 1; padding: 6px 0; border: none; background: var(--panel-2); color: var(--ink-dim); font-family: var(--mono); font-size: 11px; font-weight: 700; cursor: pointer; transition: all .1s; }
.tog-btn.active { background: var(--accent); color: #fff; }
.tog-btn:hover:not(.active) { background: var(--line); }

/* ── Viewer card ──────────────────────────────────────── */
.viewer-card { padding: 16px 18px; }

.viewer-toolbar {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 12px;
}
.viewer-title { font-family: var(--disp); font-size: 14px; font-weight: 700; color: var(--ink); letter-spacing: .3px; }
.viewer-actions { display: flex; gap: 8px; }
.act-btn {
  font-family: var(--mono); font-size: 11.5px; font-weight: 700;
  padding: 7px 14px; border-radius: 7px; border: 1px solid var(--line-strong);
  background: var(--panel-2); color: var(--ink-dim); cursor: pointer; transition: all .1s;
}
.act-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.act-btn:disabled { opacity: .35; cursor: not-allowed; }
.act-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* Canvas row */
.canvas-row {
  display: flex; gap: 0; border-radius: 8px; overflow: hidden;
  border: 1px solid var(--line);
}

.yaxis-canvas { flex-shrink: 0; background: #0e0e1a; display: block; }

.sg-container { flex: 1; position: relative; overflow: hidden; background: #0a0a14; }

.sg-canvas { display: block; width: 100%; }

/* Cursor overlay */
.cursor-overlay { position: absolute; inset: 0; pointer-events: none; }

.cursor-hline {
  position: absolute; left: 0; right: 0; height: 1px;
  background: rgba(255, 255, 255, 0.45);
  pointer-events: none;
}

.cursor-tip {
  position: absolute;
  background: rgba(10, 10, 20, 0.85); color: #e8e8f0;
  font-family: var(--mono); font-size: 11px; font-weight: 600;
  padding: 4px 8px; border-radius: 5px;
  border: 1px solid rgba(255,255,255,.15);
  white-space: nowrap; pointer-events: none;
}

/* Footer */
.viewer-footer { display: flex; justify-content: space-between; align-items: center; margin-top: 10px; flex-wrap: wrap; gap: 6px; }
.viewer-hint { font-family: var(--mono); font-size: 10.5px; color: var(--accent); font-weight: 600; }
.viewer-kbd  { font-family: var(--mono); font-size: 10px; color: var(--ink-faint); }