/* ~/lab/gradient: the UIGradient editor. Shared window, palette and controls come from ../base.css. */

.editor {
  display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: 18px; align-items: start;
  padding: 16px clamp(18px, 4vw, 40px) 0;
}

/* ---------- preview ---------- */
.stage { position: relative; height: clamp(300px, 38vw, 440px); border-bottom: 1px solid var(--line); }
.stage canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
.stage-controls { display: flex; flex-wrap: wrap; gap: 10px 18px; padding: 12px 14px; font-size: 12px; color: var(--dim); }
.stage-controls label { display: flex; align-items: center; gap: 8px; }
.stage-note { margin: 0; padding: 0 14px 14px; font-size: 12px; color: var(--dim); max-width: 70ch; }
input[type="color"] {
  width: 34px; height: 26px; padding: 0 2px; border: 1px solid var(--line); border-radius: 6px;
  background: rgba(5, 11, 18, 0.7); cursor: pointer;
}

/* ---------- sequences ---------- */
.field-head { margin: 18px 0 8px; font-size: 13px; font-weight: 700; color: var(--white); }
.field-head:first-child { margin-top: 0; }
.field-head .dim { font-weight: 400; }

/* checkerboard so transparency is visible */
.checker {
  background-color: #1a2a35;
  background-image: linear-gradient(45deg, #2b4552 25%, transparent 25%, transparent 75%, #2b4552 75%),
                    linear-gradient(45deg, #2b4552 25%, transparent 25%, transparent 75%, #2b4552 75%);
  background-size: 14px 14px; background-position: 0 0, 7px 7px;
}

.seq { position: relative; padding-bottom: 22px; }
.seq-bar { height: 34px; border-radius: 6px; border: 1px solid var(--line); cursor: copy; }
.seq-marks { position: absolute; left: 0; right: 0; bottom: 0; height: 22px; }
.mark {
  position: absolute; top: 2px; width: 16px; height: 18px; margin-left: -8px; padding: 0; cursor: grab;
  border: 2px solid var(--mist); border-radius: 3px 3px 6px 6px; background: var(--c, #fff); touch-action: none;
}
.mark::before {
  content: ""; position: absolute; left: 50%; top: -8px; margin-left: -4px;
  border: 4px solid transparent; border-bottom-color: var(--mist);
}
.mark.sel { border-color: var(--accent); outline: 2px solid rgba(52, 224, 234, 0.4); outline-offset: 1px; }
.mark.sel::before { border-bottom-color: var(--accent); }
.mark:active { cursor: grabbing; }
.mark.locked { cursor: pointer; }

.graph { position: relative; height: 120px; margin-left: 16px; border-radius: 6px; border: 1px solid var(--line); overflow: visible; cursor: copy; }
.graph svg { position: absolute; inset: 0; width: 100%; height: 100%; display: block; border-radius: 6px; }
.graph-pts { position: absolute; inset: 0; }
.pt {
  position: absolute; width: 16px; height: 16px; margin: -8px 0 0 -8px; padding: 0; border-radius: 50%;
  border: 2px solid var(--white); background: var(--bg); cursor: grab; touch-action: none;
}
.pt.sel { border-color: var(--accent); background: var(--accent); outline: 2px solid rgba(52, 224, 234, 0.4); outline-offset: 1px; }
.graph-y { position: absolute; left: -2px; transform: translateX(-100%); font-size: 12px; color: var(--dim); padding-right: 6px; }
.graph-y.top { top: -2px; }
.graph-y.bottom { bottom: -4px; }

.kp-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-top: 10px; font-size: 12px; color: var(--dim); }
.kp-row label { display: flex; align-items: center; gap: 6px; }
.kp-row input[type="number"] { width: 76px; }
.kp-row input[type="text"] { width: 86px; }

.props { display: grid; gap: 8px; font-size: 12px; color: var(--dim); }
.props label { display: grid; grid-template-columns: 9ch 1fr 76px; align-items: center; gap: 10px; }
.props input[type="range"] { width: 100%; }

.anim-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; font-size: 12px; color: var(--dim); }
.anim-row label { display: flex; align-items: center; gap: 6px; }
.anim-row input[type="number"] { width: 70px; }
.anim-row .btn[aria-pressed="true"] { border-color: var(--accent); color: var(--white); background: rgba(8, 145, 178, 0.22); }

.presets { display: grid; grid-template-columns: repeat(auto-fill, minmax(118px, 1fr)); gap: 8px; }
.preset {
  display: flex; flex-direction: column; gap: 6px; padding: 6px; text-align: left; font: inherit; font-size: 12px;
  color: var(--text); cursor: pointer; border: 1px solid var(--line); border-radius: 10px; background: rgba(255, 255, 255, 0.02);
  transition: border-color 0.2s;
}
.preset:hover { border-color: var(--accent); }
.preset .swatch { display: block; height: 22px; border-radius: 6px; overflow: hidden; }
.preset .swatch i { display: block; height: 100%; }

/* ---------- code ---------- */
.code-pane { margin: 18px clamp(18px, 4vw, 40px) 22px; }
.code-actions { display: flex; gap: 8px; }
.code-opts { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; padding: 10px 14px 0; font-size: 12px; color: var(--dim); }
.code-opts label { display: flex; align-items: center; gap: 6px; }
.code-opts input[type="text"] { width: 150px; }
.code { margin: 0; padding: 14px; overflow-x: auto; font-size: 13px; line-height: 1.65; color: #cde3ea; tab-size: 4; }
.code .k { color: var(--accent); }
.code .s { color: #93c5fd; }
.code .n { color: var(--mint); }
.code .c { color: var(--dim); font-style: italic; }
.import { padding: 0 14px 14px; }
.import > summary {
  list-style: none; cursor: pointer; width: max-content; max-width: 100%; font-size: 13px; color: var(--text);
  padding: 7px 12px; border-radius: 10px; border: 1px solid var(--line); background: rgba(255, 255, 255, 0.03);
}
.import > summary::-webkit-details-marker { display: none; }
.import > summary::before { content: "+ "; color: var(--accent); }
.import[open] > summary::before { content: "- "; }
.import > summary:hover { border-color: var(--accent); }
.import p { margin: 10px 0 8px; font-size: 12px; }
.import textarea { width: 100%; resize: vertical; line-height: 1.5; }
.import-row { display: flex; align-items: center; gap: 12px; margin-top: 8px; font-size: 12px; }
.import-row .ok { color: var(--mint); }
.import-row .err { color: var(--mist); }

.toast {
  position: fixed; left: 50%; bottom: 24px; z-index: 50; transform: translate(-50%, 20px); opacity: 0; pointer-events: none;
  padding: 8px 14px; border-radius: 10px; font-size: 13px; color: var(--white);
  background: rgba(9, 18, 27, 0.96); border: 1px solid var(--accent); transition: opacity 0.2s, transform 0.2s;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (max-width: 980px) {
  .editor { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .props label { grid-template-columns: 8ch 1fr 64px; }
  .code-pane .pane-head { flex-wrap: wrap; }
}