/* ---------------------------------------------------------------
   Shared UI chrome for the graphics toolkit.
   Linked (not fetched) so it works over file:// as well as http://.
   --------------------------------------------------------------- */
:root {
  --bg: #111114;
  --panel: #1a1a1f;
  --panel-2: #232329;
  --border: #2e2e36;
  --text: #ececf1;
  --muted: #8f8f9c;
  --accent: #6c5ce7;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font: 13px/1.45 -apple-system, BlinkMacSystemFont, 'Segoe UI', Inter, sans-serif;
  background: var(--bg);
  color: var(--text);
}
body.tool { display: flex; overflow: hidden; }

/* ---------- Sidebar ---------- */
aside {
  width: 264px;
  min-width: 264px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  overflow-y: auto;
}
h1 { font-size: 14px; font-weight: 600; letter-spacing: .02em; }
h1 span { color: var(--muted); font-weight: 400; }
h1 a { color: var(--muted); text-decoration: none; }
h1 a:hover { color: var(--text); }
.section-head {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 11px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted);
}
.section-head button {
  background: none; border: none; color: var(--accent);
  font: inherit; cursor: pointer; letter-spacing: .02em; text-transform: none; font-size: 12px;
}
.section-head button:hover { text-decoration: underline; }

/* ---------- Colour rows ---------- */
.swatch-row {
  display: flex; align-items: center; gap: 8px;
  background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px;
  padding: 6px 8px; cursor: pointer;
}
.swatch-row.selected { border-color: var(--accent); }
.swatch-row .chip {
  width: 26px; height: 26px; border-radius: 6px; border: 1px solid rgba(255,255,255,.15);
  position: relative; overflow: hidden; flex: none; cursor: pointer;
}
.swatch-row .chip input[type=color] {
  position: absolute; inset: -6px; width: 40px; height: 40px; border: none; padding: 0; cursor: pointer;
}
.swatch-row .hex {
  flex: 1; background: none; border: none; color: var(--text);
  font: 12px ui-monospace, SFMono-Regular, Menlo, monospace; text-transform: uppercase;
  outline: none; min-width: 0;
}
.swatch-row .del {
  background: none; border: none; color: var(--muted); cursor: pointer;
  font-size: 14px; line-height: 1; padding: 2px 4px; border-radius: 4px;
}
.swatch-row .del:hover { color: #ff7676; }
#swatches { display: flex; flex-direction: column; gap: 6px; }

/* ---------- Fields ---------- */
label.field { display: block; }
label.field .lbl { font-size: 11px; color: var(--muted); margin-bottom: 5px; display: flex; justify-content: space-between; }
.row2 { display: flex; gap: 8px; }
input[type=number], input[type=text], select {
  width: 100%; background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px;
  color: var(--text); padding: 7px 9px; font: 12px ui-monospace, Menlo, monospace; outline: none;
}
select { font-family: inherit; font-size: 12px; cursor: pointer; }
input[type=number]:focus, input[type=text]:focus, select:focus { border-color: var(--accent); }
input[type=range] { width: 100%; accent-color: var(--accent); }
label.field.disabled { opacity: .4; pointer-events: none; }

/* ---------- Buttons ---------- */
.btn {
  display: block; width: 100%; text-align: center; padding: 9px 10px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--panel-2); color: var(--text);
  font: 600 12px inherit; font-family: inherit; cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { filter: brightness(1.1); }
.btn-stack { display: flex; flex-direction: column; gap: 8px; }
.hint { font-size: 11px; color: var(--muted); }

/* ---------- Segmented control ---------- */
.mode-seg {
  display: grid; grid-auto-flow: column; grid-auto-columns: 1fr;
  border: 1px solid var(--border); border-radius: 8px; overflow: hidden;
}
.mode-seg button {
  background: var(--panel-2); border: none; color: var(--muted);
  font: 600 12px inherit; font-family: inherit; padding: 8px 0; cursor: pointer;
}
.mode-seg button.active { background: var(--accent); color: #fff; }

/* ---------- Stage ---------- */
main { flex: 1; display: flex; align-items: center; justify-content: center; padding: 28px; overflow: hidden; }
#stage { position: relative; box-shadow: 0 12px 48px rgba(0,0,0,.5); }
#view { display: block; border-radius: 4px; }
.handle {
  position: absolute; width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid #fff; background: rgba(255,255,255,.12);
  box-shadow: 0 0 0 1px rgba(0,0,0,.45), 0 1px 6px rgba(0,0,0,.4);
  transform: translate(-50%, -50%); cursor: grab; touch-action: none;
}
.handle:active { cursor: grabbing; }
.handle.selected { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(108,92,231,.55), 0 1px 6px rgba(0,0,0,.4); }
.radius-ring {
  position: absolute; border: 1px dashed rgba(255,255,255,.4); border-radius: 50%;
  transform: translate(-50%, -50%); pointer-events: none;
}
#pointPanel { border-top: 1px solid var(--border); padding-top: 14px; }

/* Drop target highlight */
main.dropping { outline: 2px dashed var(--accent); outline-offset: -14px; }

/* ---------- Toast ---------- */
#toast {
  position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%) translateY(8px);
  background: #000; color: #fff; border: 1px solid var(--border); border-radius: 8px;
  padding: 8px 14px; font-size: 12px; opacity: 0; pointer-events: none;
  transition: opacity .18s, transform .18s; z-index: 50;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }