:root {
  --bg: #f4f5f7; --card: #ffffff; --fg: #1b1f24; --muted: #5f6b7a; --border: #d8dde3;
  --accent: #2457c5; --accent-fg: #fff; --ok: #1f7a4d; --ok-bg: #e3f4ea;
  --bad: #b42318; --bad-bg: #fde8e6; --know: #1f7a4d; --calc: #9a5b00;
  --img-bg: #ffffff;
}
:root[data-theme="dark"] {
  --bg: #0f1216; --card: #191e24; --fg: #e6e9ee; --muted: #98a2b0; --border: #2c333b;
  --accent: #6d95ff; --accent-fg: #0f1216; --ok: #4cc08a; --ok-bg: #12301f;
  --bad: #f97066; --bad-bg: #3a1714; --know: #4cc08a; --calc: #f0a640;
  --img-bg: #e9ecef;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1216; --card: #191e24; --fg: #e6e9ee; --muted: #98a2b0; --border: #2c333b;
    --accent: #6d95ff; --accent-fg: #0f1216; --ok: #4cc08a; --ok-bg: #12301f;
    --bad: #f97066; --bad-bg: #3a1714; --know: #4cc08a; --calc: #f0a640;
    --img-bg: #e9ecef;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; background: var(--bg); color: var(--fg); }
body { font: 17px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
       -webkit-tap-highlight-color: transparent; }
#app { max-width: 760px; margin: 0 auto; padding: 12px 16px calc(24px + env(safe-area-inset-bottom)); }
h1 { font-size: 20px; margin: 0; }
.view[hidden] { display: none !important; }
.narrow { max-width: 360px; margin: 15vh auto 0; }
.stack { display: flex; flex-direction: column; gap: 12px; }
.row { display: flex; gap: 10px; flex-wrap: wrap; }
.row > * { flex: 1; }
.center { text-align: center; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.err { color: var(--bad); min-height: 1em; }
code { font-size: 13px; }

.top { display: flex; align-items: center; gap: 12px; min-height: 48px; margin-bottom: 10px; }
.top h1 { flex: 1; }
.badge { font-size: 13px; padding: 3px 10px; border-radius: 999px; border: 1px solid var(--border);
         color: var(--muted); white-space: nowrap; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px;
        padding: 16px; margin-bottom: 14px; }

.btn { font: inherit; color: var(--fg); background: var(--card); border: 1px solid var(--border);
       border-radius: 12px; padding: 12px 16px; min-height: 48px; cursor: pointer; }
.btn:active { transform: scale(0.99); }
.btn.primary { background: var(--accent); color: var(--accent-fg); border-color: transparent;
               font-weight: 600; }
.btn.ghost { background: transparent; border-color: transparent; padding-left: 4px; color: var(--accent); }
.btn:disabled { opacity: 0.45; cursor: default; }

input, select { font: inherit; color: inherit; background: var(--card); border: 1px solid var(--border);
                border-radius: 10px; padding: 10px 12px; min-height: 46px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.check { display: flex; gap: 10px; align-items: center; }
.check input { min-height: auto; width: 20px; height: 20px; }

.modes { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 8px; }
.btn.mode { display: flex; flex-direction: column; align-items: flex-start; gap: 4px;
            min-height: 96px; padding: 16px; text-align: left; }
.btn.mode b { font-size: 20px; }
.btn.mode span { font-size: 14px; color: var(--muted); }
.btn.mode[data-mode="knowledge"] b { color: var(--know); }
.btn.mode[data-mode="calc"] b { color: var(--calc); }

.today { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; text-align: center; }
.today b { display: block; font-size: 24px; }
.today span { font-size: 13px; color: var(--muted); }

.progress { flex: 1; height: 8px; background: var(--border); border-radius: 99px; overflow: hidden; }
.progress > div { height: 100%; width: 0; background: var(--accent); transition: width .25s; }

/* Fragekarte */
.qmeta { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; font-size: 13px;
         color: var(--muted); margin-bottom: 8px; }
.qmeta .id { font-weight: 700; color: var(--fg); }
.tag { border: 1px solid currentColor; border-radius: 99px; padding: 0 8px; font-weight: 600; }
.tag.new { color: var(--accent); }
.tag.knowledge { color: var(--know); } .tag.calc { color: var(--calc); }
.qtext { font-size: 18px; font-weight: 600; margin-bottom: 10px; }
.qimg { display: block; max-width: 100%; max-height: 46vh; margin: 8px auto; background: var(--img-bg);
        border-radius: 8px; padding: 4px; }
.answers { display: flex; flex-direction: column; gap: 10px; margin-top: 12px; }
.ans { display: flex; gap: 12px; align-items: flex-start; text-align: left; width: 100%;
       min-height: 56px; padding: 12px 14px; font-size: 16px; }
.ans .key { flex: none; width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--border);
            display: grid; place-items: center; font-weight: 700; font-size: 14px; }
.ans .body { flex: 1; min-width: 0; }
.ans .body img { max-height: 30vh; }
.ans.correct { border-color: var(--ok); background: var(--ok-bg); }
.ans.correct .key { background: var(--ok); color: #fff; border-color: var(--ok); }
.ans.wrong { border-color: var(--bad); background: var(--bad-bg); }
.ans.wrong .key { background: var(--bad); color: #fff; border-color: var(--bad); }
.feedback { margin-top: 14px; padding: 12px 14px; border-radius: 12px; font-weight: 600; }
.feedback.ok { background: var(--ok-bg); color: var(--ok); }
.feedback.bad { background: var(--bad-bg); color: var(--bad); }
.feedback .small { font-weight: 400; color: var(--fg); }
.next { width: 100%; margin-top: 12px; position: sticky; bottom: calc(10px + env(safe-area-inset-bottom)); }
.tools { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.tools .btn { min-height: 40px; padding: 8px 12px; font-size: 15px; }

/* Statistik */
.bars { display: flex; height: 10px; border-radius: 99px; overflow: hidden; background: var(--border); }
.bars .m { background: var(--ok); } .bars .l { background: var(--calc); }
.chap { margin: 12px 0; }
.chap .t { display: flex; justify-content: space-between; gap: 8px; font-size: 14px; margin-bottom: 4px; }
.legend { display: flex; gap: 14px; font-size: 13px; color: var(--muted); }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 4px; }
.worst li { margin-bottom: 6px; font-size: 15px; }
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; }
.kpis div { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 10px; }
.kpis b { display: block; font-size: 22px; }
.kpis span { font-size: 13px; color: var(--muted); }

.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { font-size: 14px; padding: 6px 10px; border-radius: 99px; border: 1px solid var(--border);
        background: var(--card); color: var(--fg); cursor: pointer; }
.chip.on { background: var(--accent); color: var(--accent-fg); border-color: transparent; }
/* nach dem Antworten: nur unbeteiligte Antworten abblenden */
.ans:disabled { opacity: 1; cursor: default; }
.ans:disabled:not(.correct):not(.wrong) { opacity: 0.5; }
a.btn { text-decoration: none; display: inline-flex; align-items: center; }
.hint { margin-top: 12px; padding: 12px 14px; border-radius: 12px; border: 1px dashed var(--accent);
        font-size: 16px; }
.explain { margin-top: 12px; padding: 10px 14px; border-radius: 12px; background: var(--bg);
           border: 1px solid var(--border); font-size: 16px; }
.explain summary { cursor: pointer; font-weight: 600; color: var(--accent); min-height: 32px;
                   display: flex; align-items: center; }
.explain[open] summary { margin-bottom: 6px; }

/* ---- PWA / mobile Feinschliff ---- */
html { -webkit-text-size-adjust: 100%; }
body { padding-top: env(safe-area-inset-top); overscroll-behavior-y: contain; }
.btn, .chip { touch-action: manipulation; user-select: none; -webkit-user-select: none; }
.banner { position: sticky; top: 0; z-index: 10; display: flex; gap: 12px; align-items: center;
          justify-content: space-between; padding: 10px 16px; background: var(--card);
          border-bottom: 1px solid var(--accent); }
.banner .btn { min-height: 40px; padding: 6px 14px; }
.install { width: 100%; margin-top: 10px; }
.newleft { color: var(--accent); font-weight: 600; }
.tag.off { color: var(--calc); }
.dots { letter-spacing: 2px; color: var(--ok); }
.roundscore { font-size: 20px; }
.h2 { font-size: 17px; margin-top: 0; }
body.offline .top h1::after { content: " · offline"; font-size: 13px; color: var(--calc); font-weight: 400; }
@media (hover: hover) {
  .btn:not(:disabled):hover { border-color: var(--accent); }
}
@media (max-width: 420px) {
  #app { padding-left: 12px; padding-right: 12px; }
  .qtext { font-size: 17px; }
  .ans { padding: 10px 12px; }
}
.btn.mode b.newleft { font-size: 14px; color: var(--accent); }