/* Bloch Sphere Gate Explorer. Everything is scoped to #bloch-app so the site theme (Bootstrap .row,
   full-width inputs, Poppins/Heebo headings) does not leak in and the tool's styles do not leak out.
   Layout: gate palette on top, sphere left, state readout right; stacks to one column on phones. */
#bloch-app {
  --bg: #f3f6f8;
  --panel: #ffffff;
  --ink: #15212b;
  --muted: #586977;
  --line: #d5dde3;
  --soft: #e9eef2;
  --state: #d97706;          /* state arrow */
  --rot: #7c3aed;            /* rotation axis while animating */
  --ax-x: #cf3d52;
  --ax-y: #23935f;
  --ax-z: #2c66cf;
  --sphere: rgba(44, 102, 207, 0.06);
  --btn: #ffffff;
  --btn-hover: #eaf0f5;
  --font-ui: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-num: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  background: var(--bg); color: var(--ink); font-family: var(--font-ui);
  border-radius: 12px; padding: 16px; display: grid; gap: 16px; margin-bottom: 24px; min-width: 0;
}
#bloch-app .sub { margin: 0; color: var(--muted); font-size: 0.92rem; max-width: 70ch; line-height: 1.5; }

/* gate palette */
#bloch-app .palette { display: flex; flex-wrap: wrap; gap: 10px 18px; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 12px; }
#bloch-app .group { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
#bloch-app .group-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); }
#bloch-app .gate-row { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; margin: 0; }
#bloch-app .gate { font-family: var(--font-num); font-size: 0.95rem; min-width: 44px; height: 44px; padding: 0 10px; border: 1px solid var(--line); background: var(--btn); color: var(--ink); border-radius: 7px; cursor: pointer; width: auto; line-height: 1; transition: background .15s; }
#bloch-app .gate:hover { background: var(--btn-hover); }
#bloch-app .gate:focus-visible, #bloch-app select:focus-visible, #bloch-app input:focus-visible { outline: 2px solid var(--ax-z); outline-offset: 2px; }
#bloch-app .gate.pauli { border-bottom: 3px solid var(--ax-x); }
#bloch-app .gate.cliff { border-bottom: 3px solid var(--ax-z); }
#bloch-app .gate.tg { border-bottom: 3px solid var(--state); }
#bloch-app .gate.rot { border-bottom: 3px solid var(--rot); }
#bloch-app .gate.small { font-family: var(--font-ui); font-size: 0.82rem; }
#bloch-app select, #bloch-app input[type="number"] { height: 44px; width: auto; border: 1px solid var(--line); background: var(--btn); color: var(--ink); border-radius: 7px; padding: 0 8px; font-family: var(--font-num); font-size: 0.95rem; }
#bloch-app select { -webkit-appearance: auto; -moz-appearance: auto; appearance: auto; background-image: none; padding-right: 4px; }
#bloch-app input[type="number"] { width: 88px; }
#bloch-app input[aria-invalid="true"] { border-color: var(--ax-x); }
#bloch-app .rot-error { flex-basis: 100%; margin: 0; color: var(--ax-x); font-size: 0.8rem; }
#bloch-app .rot-error:empty { display: none; }

/* main area */
#bloch-app .main { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 16px; align-items: start; }
@media (max-width: 860px) { #bloch-app .main { grid-template-columns: minmax(0, 1fr); } }
#bloch-app .stage { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px; display: grid; gap: 8px; min-width: 0; }
#bloch-app #sphere { width: 100%; max-width: 100%; aspect-ratio: 1 / 1; display: block; touch-action: none; cursor: grab; }
#bloch-app #sphere:active { cursor: grabbing; }
#bloch-app .stage-foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px; color: var(--muted); font-size: 0.8rem; align-items: center; }
#bloch-app .legend { display: flex; gap: 12px; flex-wrap: wrap; }
#bloch-app .legend span::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 5px; vertical-align: -1px; background: var(--c); }

/* readout */
#bloch-app .readout { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 14px; display: grid; gap: 14px; min-width: 0; }
#bloch-app .block { display: grid; gap: 6px; min-width: 0; }
#bloch-app .block h2 { font-family: var(--font-ui); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 0; font-weight: 600; line-height: 1.3; }
#bloch-app .ket { font-family: var(--font-num); font-size: 1rem; line-height: 1.55; overflow-wrap: anywhere; }
#bloch-app .kv { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 4px 12px; margin: 0; font-family: var(--font-num); font-size: 0.88rem; font-variant-numeric: tabular-nums; }
#bloch-app .kv dt { color: var(--muted); font-weight: 400; }
#bloch-app .kv dd { margin: 0; overflow-wrap: anywhere; }
#bloch-app .exact { color: var(--muted); }
#bloch-app .prob { display: grid; grid-template-columns: 54px minmax(0, 1fr) 64px; gap: 8px; align-items: center; font-family: var(--font-num); font-size: 0.85rem; font-variant-numeric: tabular-nums; }
#bloch-app .bar { height: 10px; background: var(--soft); border-radius: 5px; overflow: hidden; }
#bloch-app .bar > i { display: block; height: 100%; background: var(--ax-z); border-radius: 5px; transition: width .35s; }
#bloch-app .bar.one > i { background: var(--ax-x); }
#bloch-app .gatebox { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 12px; align-items: center; }
#bloch-app .matrix { font-family: var(--font-num); font-size: 0.82rem; display: grid; grid-template-columns: auto auto; gap: 2px 14px; padding: 4px 10px; border-left: 2px solid var(--ink); border-right: 2px solid var(--ink); border-radius: 4px; }
#bloch-app .note { font-size: 0.86rem; color: var(--muted); line-height: 1.45; }
#bloch-app .circuit { font-family: var(--font-num); font-size: 0.88rem; background: var(--soft); border-radius: 7px; padding: 8px 10px; overflow-x: auto; white-space: nowrap; }
#bloch-app .pill { display: inline-block; font-size: 0.75rem; padding: 2px 8px; border-radius: 99px; background: var(--soft); color: var(--ink); font-family: var(--font-num); text-transform: none; letter-spacing: 0; }
@media (max-width: 400px) { #bloch-app { padding: 10px; } #bloch-app .gatebox { grid-template-columns: minmax(0, 1fr); } }
@media (prefers-reduced-motion: reduce) { #bloch-app .bar > i, #bloch-app .gate { transition: none; } }