/* Waveguide explorer (Week 7). Appearance only; behaviour is in js/waveguide-explorer.js. */
.wg-explorer{--wg-e:#d55e00;--wg-h:#0072b2;--wg-pos:#009e73;--wg-neg:#cc79a7;margin:2rem 0;border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow);overflow:hidden}
.wg-explorer__head{display:flex;flex-wrap:wrap;gap:.6rem 1.2rem;align-items:center;justify-content:space-between;padding:1rem 1.25rem;border-bottom:1px solid var(--line);background:#f4f9f9}
.wg-explorer__head h2{margin:0;font-size:1.35rem;letter-spacing:-.01em}
.wg-mode-tag{font-weight:800;color:var(--orbit-dark);font-size:1.05rem}
.wg-status{display:inline-flex;align-items:center;gap:.5rem;padding:.4rem .85rem;border-radius:999px;font-weight:800;font-size:.92rem;border:1px solid transparent}
.wg-status::before{content:"";width:.7rem;height:.7rem;border-radius:50%;background:currentColor}
.wg-status[data-regime="above"]{background:#e3f5ee;color:#0b6b4b;border-color:#a9dcc8}
.wg-status[data-regime="at"]{background:#fff3d6;color:#8a5200;border-color:#efd08a}
.wg-status[data-regime="below"]{background:#fde8e5;color:#9e2217;border-color:#f1b5ac}

.wg-controls{display:grid;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:1rem;padding:1rem 1.25rem;border-bottom:1px solid var(--line)}
.wg-group{margin:0;padding:0;border:0;min-width:0}
.wg-group legend{padding:0;margin-bottom:.4rem;font-weight:800;font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--orbit-dark)}
.wg-row{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem .75rem;margin-bottom:.55rem}
.wg-row label{font-size:.9rem;color:var(--muted)}
.wg-explorer input[type="number"],.wg-explorer select{min-width:0;width:6.2rem;padding:.4rem .5rem;border:1px solid #b9c3d1;border-radius:.5rem;background:#fff;color:var(--ink)}
.wg-explorer select{width:auto}
.wg-explorer input[type="number"][aria-invalid="true"]{border-color:var(--red);background:#fff4f2}
.wg-explorer input[type="range"]{width:100%;accent-color:var(--orbit)}
.wg-btn{padding:.45rem .8rem;border:1px solid #b9c3d1;border-radius:999px;background:#fff;color:var(--ink);font-weight:700;font-size:.88rem}
.wg-btn:hover{border-color:var(--orbit);color:var(--orbit-dark)}
.wg-btn--primary{background:var(--orbit-dark);border-color:var(--orbit-dark);color:#fff}
.wg-btn--primary:hover{color:#fff;background:var(--orbit)}
.wg-btn-row{display:flex;flex-wrap:wrap;gap:.45rem}
.wg-radio{display:inline-flex;align-items:center;gap:.35rem;padding:.3rem .7rem;border:1px solid #b9c3d1;border-radius:999px;font-weight:700;font-size:.9rem;cursor:pointer}
.wg-radio:has(input:checked){background:#e9f7f6;border-color:var(--orbit)}
.wg-radio:has(input:focus-visible){outline:3px solid #7ab4ff;outline-offset:2px}
.wg-radio input{accent-color:var(--orbit)}
.wg-radio--e{color:#a24800}.wg-radio--h{color:#005a8c}

.wg-readouts{display:grid;grid-template-columns:repeat(auto-fit,minmax(9.5rem,1fr));gap:.1rem .9rem;padding:.9rem 1.25rem;border-bottom:1px solid var(--line);background:#fbfcfd}
.wg-readouts div{padding:.45rem 0;border-top:2px solid var(--orbit)}
.wg-readouts dt{font-size:.82rem;font-weight:800;color:var(--muted)}
.wg-readouts dd{margin:0;font-size:1.15rem;font-weight:800;color:var(--ink);font-variant-numeric:tabular-nums}
.wg-readouts small{font-weight:600;color:var(--muted);font-size:.78rem}

.wg-notes{padding:.9rem 1.25rem 0}
.wg-note{margin:0 0 .9rem;padding:.8rem 1rem;border-left:4px solid var(--orbit);background:#f2f9f9;border-radius:0 .6rem .6rem 0}
.wg-note[data-wg-state="at"]{border-color:#c98a00;background:#fff8e6}
.wg-note[data-wg-state="below"]{border-color:#c0392b;background:#fff3f1}
.wg-note[hidden]{display:none}

.wg-stage{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.15fr);gap:1rem 1.25rem;padding:1rem 1.25rem}
.wg-panel{align-self:start;margin:0;min-width:0;border:1px solid var(--line);border-radius:.8rem;background:#fff;overflow:hidden}
.wg-panel figcaption{padding:.55rem .8rem;border-bottom:1px solid var(--line);font-size:.86rem;color:var(--muted);background:#f8fafb}
.wg-panel figcaption strong{color:var(--ink)}
.wg-panel canvas{display:block;width:100%}
.wg-stage__axial{display:grid;gap:1rem;align-content:start;min-width:0}
.wg-panel--wide{grid-column:1 / -1}
.wg-stretch{margin:0;padding:0 .8rem .45rem;font-size:.78rem;color:var(--muted);min-height:1.1em}
.wg-stretch:empty{display:none}

.wg-legend{display:flex;flex-wrap:wrap;gap:.5rem 1.4rem;padding:0 1.25rem 1.1rem;font-size:.86rem;color:var(--muted)}
.wg-legend span{display:inline-flex;align-items:center;gap:.4rem}
.wg-key{display:inline-block;width:1.6rem;height:.18rem;border-radius:2px}
.wg-key--e{background:var(--wg-e)}.wg-key--h{background:var(--wg-h)}
.wg-chip{display:inline-block;width:.9rem;height:.9rem;border-radius:3px}
.wg-chip--pos{background:rgba(0,158,115,.55)}.wg-chip--neg{background:rgba(204,121,167,.6)}

.wg-ladder{margin:0;padding:0;list-style:none;display:grid;gap:.3rem;font-variant-numeric:tabular-nums;font-size:.9rem}
.wg-ladder li{padding:.3rem .6rem;border-radius:.45rem;border:1px solid var(--line);background:#fff;color:var(--muted)}
.wg-ladder li[data-propagating="true"]{background:#e3f5ee;border-color:#a9dcc8;color:#0b6b4b;font-weight:700}
.wg-ladder li[data-current="true"]{box-shadow:inset 3px 0 0 var(--orbit-dark)}
.wg-assumptions{margin:0;padding:.9rem 1.25rem 1.1rem;border-top:1px solid var(--line);background:#fbfcfd;font-size:.88rem;color:var(--muted)}
.wg-assumptions ul{margin:.3rem 0 0;padding-left:1.1rem}
.wg-explorer output{font-variant-numeric:tabular-nums}

@media (max-width:900px){
  .wg-stage{grid-template-columns:minmax(0,1fr)}
  .wg-controls,.wg-readouts,.wg-notes,.wg-stage,.wg-legend{padding-left:.9rem;padding-right:.9rem}
}
@media (max-width:520px){
  .wg-readouts{grid-template-columns:repeat(2,minmax(0,1fr))}
  .wg-explorer__head{padding:.8rem .9rem}
}
@media (prefers-reduced-motion:reduce){.wg-explorer *{transition:none!important;animation:none!important}}

.wg-row--slider{flex-wrap:nowrap}
.wg-row--slider label{flex:0 0 6.6rem}
.wg-row--slider input[type="range"]{flex:1 1 4rem;min-width:3rem;width:auto}
.wg-row--slider .wg-unit{white-space:nowrap;color:var(--muted);font-size:.85rem}