/* A small physical control outside the reading column. */
.lighting-switch {
  --cord-fill:#a8cbff;--cord-edge:#507cb8;--cord-hover:#cee1ff;
  position:fixed;z-index:60;top:0;right:max(12px,env(safe-area-inset-right));
  width:48px;height:116px;padding:0;border:0;background:transparent;
  color:#cbd5e1;cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent;
}
.lighting-switch[hidden] { display:none; }
.lighting-cord { display:block;overflow:visible;filter:drop-shadow(1px 3px 2px rgba(0,0,0,.3)); }
.cord-mount { fill:#8593a8;stroke:#cbd5e1;stroke-width:1; }
.cord-thread { stroke:#64748b;stroke-width:1; }
.cord-thread,.cord-beads { transform-origin:24px 7px; }
.cord-beads { stroke:currentColor;stroke-width:3;stroke-dasharray:.1 5;stroke-linecap:round; }
.cord-handle { fill:var(--cord-fill);stroke:var(--cord-edge);stroke-width:1; }
.cord-grip { fill:none;stroke:var(--cord-edge);stroke-width:1; }
.lighting-switch:hover .cord-handle { fill:var(--cord-hover); }
.lighting-switch:focus-visible { outline:2px solid var(--accent-bright);outline-offset:3px;border-radius:0 0 16px 16px; }
.lighting-hint {
  position:absolute;right:54px;top:74px;white-space:nowrap;padding:3px 10px;
  background:var(--bg-deep);color:var(--fg);border:1px solid var(--line-strong);
  border-radius:6px;font:500 12px/1.6 var(--sans);opacity:0;pointer-events:none;
}
.lighting-switch:hover .lighting-hint,.lighting-switch:focus-visible .lighting-hint { opacity:1; }
@media (max-width:900px) { .lighting-switch { right:78px;height:94px; } .lighting-cord { height:90px; } .lighting-hint { top:62px; } }
@media screen {
  html[data-theme] { transition:background-color .18s ease-out; }
  html[data-theme] body { transition:color .18s ease-out; }
  :root[data-theme="light"] {
    color-scheme:light;--bg:#f8fafc;--bg-deep:#edf2f8;--fg:#172235;
    --muted:#44546a;--quiet:#52647c;--surface:rgba(18,40,70,.035);
    --line:rgba(18,40,70,.14);--line-strong:rgba(18,40,70,.23);
    --glass:rgba(255,255,255,.82);--glass-strong:rgba(225,234,246,.9);
    --accent-bright:#174fb5;--shadow-card:0 20px 44px -28px rgba(22,43,70,.22);
    --shadow-lift:0 26px 60px -26px rgba(22,43,70,.25);
  }
  [data-theme="light"] body::before { background:radial-gradient(ellipse at 20% 0%,rgba(104,154,231,.15),transparent 65%); }
  [data-theme="light"] .site-nav,[data-theme="light"] .site-nav.scrolled,[data-theme="light"] #primary-nav.open { background:rgba(248,250,252,.96); }
  [data-theme="light"] .work-card,[data-theme="light"] .research-cell,[data-theme="light"] .detail-panel { background:var(--glass); }
  [data-theme="light"] .site-footer { background:var(--bg-deep); }
  [data-theme="light"] .skill-chip { background:#e5edf7;color:var(--fg); }
  [data-theme="light"] .skill-chip:hover,[data-theme="light"] .skill-chip:focus-visible { background:#d7e5f9; }
  [data-theme="light"] .badge,[data-theme="light"] .badge-award { color:#174887;background:#e0eafb;border-color:#a9c4ed; }
  [data-theme="light"] .prose a:not(.button),[data-theme="light"] .record-body a { text-decoration-color:#6c86aa; }
  [data-theme="light"] .prose pre,[data-theme="light"] .prose code { background:#e8eef6;color:#172235; }
  [data-theme="light"] .lighting-switch { color:#64748b;--cord-fill:#2563eb;--cord-edge:#153f98;--cord-hover:#3b75ef; }
  [data-theme="light"] .cord-grip { stroke:#b7d3ff; }
}
@media (prefers-reduced-motion:reduce) { html[data-theme],html[data-theme] body { transition:none; } }
@media print { .lighting-switch { display:none; } }