/* Lernhelden – Grundlagen: Seite, Panels, Knöpfe, Chips, Hilfsklassen. */
/* ---------- 2. Grundlagen ---------- */
*{box-sizing:border-box}
html{font-size:var(--fs-root);color-scheme:light}
:root[data-theme="dark"]{color-scheme:dark}
body{margin:0;font-family:"Segoe UI",system-ui,-apple-system,BlinkMacSystemFont,Roboto,"Helvetica Neue",sans-serif;
  background:linear-gradient(160deg,var(--bg),var(--bg-2)) fixed;color:var(--ink);line-height:1.45;
  -webkit-tap-highlight-color:transparent}
button,input,select,textarea{font:inherit;color:inherit}
h1,h2,h3,h4{line-height:1.2}
.app-shell{max-width:1180px;margin:0 auto;padding:0 20px 24px;min-height:100vh}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
[hidden]{display:none!important}

.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm)}
.button-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:var(--tap);
  border:2px solid transparent;border-radius:999px;padding:10px 20px;font-weight:800;cursor:pointer;
  background:var(--surface);color:var(--ink);border-color:var(--line);transition:transform .08s,background .15s,border-color .15s}
@media (hover:hover){.btn:hover{border-color:var(--brand-ink)}}
.btn:active{transform:translateY(1px)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:var(--on-brand)}
@media (hover:hover){.btn.primary:hover{filter:brightness(1.08)}}
.btn.ghost{background:transparent}
.btn.large{font-size:1.1rem;padding:12px 28px}
.btn:disabled{cursor:default;opacity:.55}
:focus-visible{outline:3px solid var(--brand);outline-offset:3px}
.btn:focus-visible,.choice:focus-visible,.answer-input:focus-visible{outline:3px solid var(--brand);outline-offset:3px}

.chip{display:inline-block;font-size:.78rem;font-weight:800;padding:3px 9px;border-radius:999px;background:var(--soft);color:var(--chip-ink)}
.chipline{display:flex;gap:6px;flex-wrap:wrap}
.muted-hint{color:var(--muted);font-weight:600;margin:0}
.error-text{color:var(--bad);font-size:.9rem}
.version-notice{margin:14px 0 0;padding:12px 14px;border-radius:var(--radius-sm);background:var(--good-soft);
  border:1px solid var(--good-line);color:var(--good);font-weight:700}
.mini-badge{display:inline-block;margin-left:.5rem;padding:.12rem .5rem;border-radius:999px;background:var(--soft);
  color:var(--chip-ink);font-size:.72rem;font-weight:900;vertical-align:middle}
.training-open,.timer-alarm-open,.dialog-open,.wissen-open{overflow:hidden}