:root {
  --bg: #f3f4f1;
  --panel: #ffffff;
  --ink: #15191e;
  --muted: #5d6670;
  --line: #e2e5e0;
  --soft: #eef0ec;
  --accent: #1f5fbf;
  --accent-ink: #ffffff;
  --good: #2b8a3e;
  --good-bg: #ebf7ee;
  --warn: #b35c00;
  --warn-bg: #fff4e5;
  --bad: #c92a2a;
  --bad-bg: #fdecec;
  --asphalt: #4a4f56;
  --grass: #86b25f;
  --grass-dot: #77a352;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(0,0,0,.06), 0 6px 20px rgba(0,0,0,.06);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121416;
    --panel: #1c1f23;
    --ink: #eceef0;
    --muted: #9aa3ad;
    --line: #2d3238;
    --soft: #252a30;
    --accent: #4d8ef0;
    --good: #51cf66;
    --good-bg: #16261b;
    --warn: #ffa94d;
    --warn-bg: #2b2114;
    --bad: #ff6b6b;
    --bad-bg: #2d1a1a;
    --asphalt: #3d4248;
    --grass: #5e8a3f;
    --grass-dot: #537c37;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 6px 20px rgba(0,0,0,.3);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-tap-highlight-color: transparent;
}
button, select { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { cursor: default; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* ---------- Kopfzeile ---------- */
.bar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 10px;
  padding: 10px 16px; padding-top: max(10px, env(safe-area-inset-top));
  background: color-mix(in srgb, var(--panel) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; }
.bar-title { flex: 1; min-width: 0; display: flex; flex-direction: column; line-height: 1.2; }
.bar-title b { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bar-topic { font-size: 12px; color: var(--muted); }
.bar-count { font-size: 14px; color: var(--muted); font-variant-numeric: tabular-nums; }

.icon-btn {
  display: inline-grid; place-items: center;
  width: 40px; height: 40px; flex: none;
  border: 1px solid var(--line); border-radius: 12px;
  background: var(--panel);
}
.icon-btn:hover { background: var(--soft); }
.icon-btn.solid { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

/* ---------- Knöpfe ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 8px 16px;
  border: 1px solid var(--line); border-radius: 12px;
  background: var(--panel); font-weight: 600;
}
.btn:hover:not(:disabled) { background: var(--soft); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover:not(:disabled) { filter: brightness(1.08); background: var(--accent); }
.btn.ghost { background: transparent; }
.btn.big { min-height: 52px; padding: 10px 20px; font-size: 17px; }
.btn:disabled { opacity: .45; }

.chip {
  display: inline-grid; place-items: center;
  width: 28px; height: 28px; flex: none;
  border-radius: 50%;
  border: 3px solid var(--c);
  background: #fff; color: #15191e;
  font-weight: 800; font-size: 14px;
}

/* ---------- Startseite ---------- */
.home { max-width: 1100px; margin: 0 auto; padding: 16px 16px 40px; }
.hero { padding: 20px 0 8px; }
.hero h1 { font-size: clamp(28px, 6vw, 40px); line-height: 1.1; margin: 0 0 8px; letter-spacing: -.02em; }
.hero p { margin: 0 0 18px; color: var(--muted); max-width: 60ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.progress { display: flex; align-items: center; gap: 12px; margin-top: 18px; font-size: 14px; color: var(--muted); }
.progress-bar { flex: 0 1 240px; height: 8px; border-radius: 4px; background: var(--line); overflow: hidden; }
.progress-bar i { display: block; height: 100%; background: var(--good); border-radius: 4px; }

.topic h2 { font-size: 15px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 28px 0 10px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px, 1fr)); gap: 12px; }
.card {
  display: flex; flex-direction: column; text-align: left;
  padding: 0; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--panel); overflow: hidden; box-shadow: var(--shadow);
  transition: transform .12s ease;
}
.card:hover { transform: translateY(-2px); }
.thumb { aspect-ratio: 16 / 10; overflow: hidden; background: var(--grass); }
.thumb svg { width: 100%; height: auto; display: block; margin-top: -9%; }
.card-body { padding: 10px 12px 12px; }
.card-title { font-weight: 700; }
.card-meta { display: flex; align-items: center; gap: 10px; margin-top: 6px; }
.card-meta .chip { width: 22px; height: 22px; font-size: 11px; border-width: 2.5px; margin-left: -6px; }
.card-meta .vcount { display: flex; padding-left: 6px; }
.done { margin-left: auto; display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--good); color: #fff; }
.dots { display: inline-flex; gap: 3px; }
.dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--line); }
.dots i.on { background: var(--warn); }

.rules { margin-top: 32px; background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 4px 16px; }
.rules summary { cursor: pointer; font-weight: 700; padding: 12px 0; }
.rules ol { margin: 0 0 16px; padding-left: 20px; }
.rules li { margin-bottom: 8px; }
.foot { margin-top: 24px; font-size: 13px; color: var(--muted); }

/* ---------- Aufgabe ---------- */
.task {
  max-width: 1180px; margin: 0 auto; padding: 12px 16px 40px;
  display: grid; gap: 16px;
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 900px) {
  .task { grid-template-columns: minmax(0, 1.1fr) minmax(360px, .9fr); align-items: start; padding-top: 20px; }
  .stage { position: sticky; top: 76px; }
}
.board-wrap {
  border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
  background: var(--grass); max-width: 620px; margin: 0 auto;
}
.board { display: block; width: 100%; height: auto; user-select: none; }
.veh.clickable { cursor: pointer; }
.veh { transition: opacity .3s; }

.blink { animation: blink .9s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.blue1 { animation: blink .5s steps(1) infinite; }
.blue2 { animation: blink .5s steps(1) infinite reverse; animation-delay: .25s; }
.warn-ring { animation: pulse .7s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .3; } }
.crash { animation: pop .35s ease-out; transform-box: fill-box; }
@keyframes pop { from { opacity: 0; } }

.panel { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.q h2 { font-size: 19px; line-height: 1.3; margin: 0; }
.hint { margin: 4px 0 0; color: var(--muted); }
.vlist { list-style: none; margin: 10px 0 6px; padding: 0; display: grid; gap: 8px; }
.vrow {
  display: grid; grid-template-columns: auto 1fr auto; gap: 10px; align-items: center;
  width: 100%; padding: 10px; text-align: left;
  border: 1px solid var(--line); border-radius: 12px; background: var(--panel);
  transition: border-color .12s, background .12s;
}
.vrow:hover:not(:disabled) { background: var(--soft); }
.vrow.picked { border-color: var(--ink); }
.vrow.dim { opacity: .45; }
.vrow:disabled { cursor: default; }
.vdesc { font-size: 14px; line-height: 1.35; }
.pick .plus {
  display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%;
  border: 2px dashed var(--muted); color: var(--muted); font-weight: 700; font-size: 18px;
}
.pick .step { width: 30px; height: 30px; font-size: 15px; }

.seq-box { margin-top: 14px; padding: 12px; border-radius: 12px; background: var(--soft); }
.seq-box.dim { opacity: .45; }
.seq { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; min-height: 40px; }
.seq .chip { width: 38px; height: 38px; font-size: 17px; }
.seq-empty { color: var(--muted); font-size: 14px; }
.join {
  display: grid; place-items: center; min-width: 38px; height: 38px; padding: 0 6px;
  border: 1px solid var(--line); border-radius: 10px; background: var(--panel);
  font-size: 22px; font-weight: 700; line-height: 1; color: var(--muted);
}
.join.on { background: var(--good); border-color: var(--good); color: #fff; }
.join:hover:not(:disabled):not(.static) { border-color: var(--ink); color: var(--ink); }
.join.on:hover:not(:disabled):not(.static) { color: #fff; }
.join.static { min-width: 26px; height: 30px; border: 0; background: transparent; font-size: 20px; }
.join.static.on { color: var(--good); background: transparent; }
.seq-box .small { margin: 8px 0 0; }
.small { font-size: 13px; color: var(--muted); margin: 6px 0; }

.toggle {
  display: flex; align-items: center; gap: 10px; width: 100%;
  margin: 8px 0 4px; padding: 10px 12px; text-align: left;
  border: 1px dashed var(--line); border-radius: 12px; background: transparent; font-size: 14px;
}
.toggle.on { border-style: solid; border-color: var(--ink); }
.toggle .box { display: grid; place-items: center; width: 22px; height: 22px; flex: none; border: 2px solid var(--muted); border-radius: 6px; }
.toggle.on .box { background: var(--ink); border-color: var(--ink); color: var(--panel); }
.toggle:disabled { opacity: .6; }

.actions { display: flex; gap: 10px; margin-top: 12px; }
.actions .primary { flex: 1; }

/* ---------- Rückmeldung ---------- */
.fb { margin-top: 14px; border-radius: 12px; padding: 14px; border: 1px solid; scroll-margin-top: 70px; }
.fb.correct { background: var(--good-bg); border-color: color-mix(in srgb, var(--good) 40%, transparent); }
.fb.safe { background: var(--warn-bg); border-color: color-mix(in srgb, var(--warn) 40%, transparent); }
.fb.wrong { background: var(--bad-bg); border-color: color-mix(in srgb, var(--bad) 40%, transparent); }
.fb-head { display: flex; gap: 12px; align-items: center; }
.fb-head h3 { margin: 0; font-size: 20px; }
.fb-head p { margin: 0; color: var(--muted); font-size: 14px; }
.fb-icon { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; color: #fff; font-weight: 800; font-size: 20px; flex: none; }
.correct .fb-icon { background: var(--good); }
.safe .fb-icon { background: var(--warn); }
.wrong .fb-icon { background: var(--bad); }
.issues { margin: 10px 0 0; padding-left: 20px; font-size: 14px; }
.fb-sec { margin-top: 14px; }
.fb-sec h4 { margin: 0 0 6px; font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); }
.solution { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 14px; }
.solution .chip { width: 34px; height: 34px; font-size: 15px; }
.step { display: grid; place-items: center; width: 24px; height: 24px; border-radius: 50%; background: var(--ink); color: var(--panel); font-weight: 700; font-size: 13px; }
.why, .notes { margin: 0; padding-left: 20px; font-size: 14px; }
.why li, .notes li { margin-bottom: 5px; }
.why li.free::marker { color: var(--good); }
.why li.deadlock { font-weight: 600; }
.notes { margin-top: 8px; color: var(--muted); }
.fb-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.fb-actions .btn { flex: 1 1 180px; }

/* ---------- Simulation ---------- */
.simbar {
  max-width: 620px; margin: 10px auto 0;
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 10px 12px; box-shadow: var(--shadow);
}
.sim-title { font-weight: 700; font-size: 14px; display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: baseline; }
.sim-status { font-weight: 400; color: var(--muted); }
.sim-status .bad { color: var(--bad); }
.sim-status .good { color: var(--good); }
.sim-ctrl { display: flex; align-items: center; gap: 8px; margin-top: 8px; }
.seg { display: inline-flex; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; flex: 1; min-width: 0; }
.seg button { flex: 1; min-height: 40px; padding: 6px 8px; border: 0; background: var(--panel); font-size: 14px; white-space: nowrap; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button.on { background: var(--ink); color: var(--panel); font-weight: 600; }
@media (max-width: 520px) {
  .sim-ctrl { flex-wrap: wrap; }
  .sim-ctrl .seg { order: 5; flex-basis: 100%; }
  .sim-ctrl [data-sim=close] { margin-left: auto; }
}

/* ---------- Editor ---------- */
.editor .field { margin-bottom: 14px; }
.editor .field > label { display: block; font-weight: 700; font-size: 14px; margin-bottom: 6px; }
.editor .field.inline { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; }
.editor .field.inline > label { font-weight: 500; margin: 0; flex: 1 1 120px; }
.editor .field.inline .seg { flex: 1 1 220px; }
.seg.wide { display: flex; }
select {
  width: 100%; min-height: 42px; padding: 6px 10px;
  border: 1px solid var(--line); border-radius: 10px; background: var(--panel);
}
.elist { list-style: none; margin: 0 0 8px; padding: 0; display: grid; gap: 8px; }
.erow {
  display: grid; gap: 6px; align-items: center;
  grid-template-columns: auto 1fr 1fr auto;
  padding: 8px; border: 1px solid var(--line); border-radius: 12px;
}
.erow select[data-f=type] { grid-column: 2 / 4; }
.erow .icon-btn { grid-column: 4; grid-row: 1; }
.erow select[data-f=start] { grid-column: 1 / 3; }
.erow select[data-f=to] { grid-column: 3 / 5; }

/* ---------- Prüfung ---------- */
.home.narrow { max-width: 720px; display: grid; gap: 16px; padding-top: 20px; }
.home.narrow .panel h2 { font-size: 17px; margin: 0 0 10px; }
.setup h1 { margin: 0 0 6px; font-size: 28px; }
.setup p { margin: 0 0 16px; color: var(--muted); }
.setup-label { font-weight: 700; margin-bottom: 8px; }
.sizes button { min-height: 52px; font-size: 20px; font-weight: 700; }
.btn.full { width: 100%; margin-top: 12px; }

.history ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.history li { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; padding: 8px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.history li:last-child { border-bottom: 0; }
.h-date { color: var(--muted); font-variant-numeric: tabular-nums; }
.h-score { font-weight: 600; flex: 1; }
.badge { padding: 2px 10px; border-radius: 999px; font-size: 13px; font-weight: 600; }
.badge.pass { background: var(--good-bg); color: var(--good); }
.badge.fail { background: var(--bad-bg); color: var(--bad); }

.timer { display: inline-flex; align-items: center; gap: 5px; font-size: 15px; color: var(--muted); font-variant-numeric: tabular-nums; }
.exam-progress { display: flex; gap: 3px; max-width: 1180px; margin: 10px auto 0; padding: 0 16px; }
.exam-progress i { flex: 1; height: 6px; border-radius: 3px; background: var(--line); }
.exam-progress i.done { background: var(--accent); }
.exam-progress i.correct { background: var(--good); }
.exam-progress i.safe { background: var(--warn); }
.exam-progress i.wrong { background: var(--bad); }
.exam-progress i.cur { outline: 2px solid var(--ink); outline-offset: 1px; }

.result { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; }
.result.pass { border-color: color-mix(in srgb, var(--good) 45%, transparent); }
.result.fail { border-color: color-mix(in srgb, var(--bad) 45%, transparent); }
.score {
  --c: var(--good);
  width: 116px; height: 116px; border-radius: 50%; flex: none;
  display: grid; place-items: center;
  background: conic-gradient(var(--c) calc(var(--p) * 1%), var(--line) 0);
}
.result.fail .score { --c: var(--bad); }
.score span { display: flex; align-items: baseline; justify-content: center; padding-top: 26px; width: 92px; height: 92px; border-radius: 50%; background: var(--panel); font-size: 30px; font-weight: 800; }
.score small { font-size: 16px; font-weight: 700; margin-left: 1px; }
.score-text { flex: 1 1 240px; }
.score-text h1 { margin: 0; font-size: 28px; }
.result.pass h1 { color: var(--good); }
.result.fail h1 { color: var(--bad); }
.score-text p { margin: 4px 0 10px; }
.counts { display: flex; flex-wrap: wrap; gap: 6px; }
.cnt { padding: 3px 10px; border-radius: 999px; font-size: 13px; font-weight: 600; }
.cnt.correct { background: var(--good-bg); color: var(--good); }
.cnt.safe { background: var(--warn-bg); color: var(--warn); }
.cnt.wrong { background: var(--bad-bg); color: var(--bad); }

.topics { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.topics li { display: grid; grid-template-columns: minmax(110px, 1fr) 2fr auto; gap: 10px; align-items: center; font-size: 14px; }
.t-bar { height: 10px; border-radius: 5px; background: var(--line); overflow: hidden; }
.t-bar i { display: block; height: 100%; border-radius: 5px; }
.t-bar i.ok { background: var(--good); }
.t-bar i.mid { background: var(--warn); }
.t-bar i.low { background: var(--bad); }
.t-val { font-variant-numeric: tabular-nums; color: var(--muted); }

.q-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.q-row {
  width: 100%; display: grid; grid-template-columns: 26px 64px 1fr auto; gap: 10px; align-items: center;
  padding: 6px 10px 6px 8px; text-align: left;
  border: 1px solid var(--line); border-radius: 12px; background: var(--panel);
}
.q-row:hover { background: var(--soft); }
.q-num { font-weight: 700; color: var(--muted); text-align: center; font-variant-numeric: tabular-nums; }
.q-thumb { width: 64px; height: 64px; border-radius: 8px; overflow: hidden; }
.q-thumb svg { width: 100%; height: 100%; display: block; }
.q-title { display: flex; flex-direction: column; line-height: 1.25; min-width: 0; }
.q-title small { color: var(--muted); }
.q-status { font-size: 13px; font-weight: 700; padding: 3px 9px; border-radius: 999px; white-space: nowrap; }
.q-status.correct { background: var(--good-bg); color: var(--good); }
.q-status.safe { background: var(--warn-bg); color: var(--warn); }
.q-status.wrong { background: var(--bad-bg); color: var(--bad); }
.home.narrow > .actions { margin: 0; }
.home.narrow > .actions .btn { flex: 1; }

/* ---------- Anleitung ---------- */
.small-btn { min-height: 38px; padding: 6px 12px; font-size: 14px; }
.guide h2 { font-size: 21px; margin: 0 0 8px; }
.g-intro { margin: 0 0 12px; }
.g-points { margin: 0; padding-left: 20px; display: grid; gap: 10px; }
.g-status { display: flex; gap: 10px; align-items: flex-start; padding: 10px 12px; border-radius: 12px; margin-bottom: 4px; font-size: 15px; }
.g-status p { margin: 0; }
.g-icon { display: grid; place-items: center; width: 26px; height: 26px; flex: none; border-radius: 50%; font-weight: 800; color: #fff; }
.g-status.todo { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.g-status.todo .g-icon { background: var(--accent); }
.g-status.ok { background: var(--good-bg); }
.g-status.ok .g-icon { background: var(--good); }
.g-status.no { background: var(--warn-bg); }
.g-status.no .g-icon { background: var(--warn); }
.guide .actions .btn.ghost { flex: 0 0 auto; }