/* ============================================================
   Lern-Quiz – Stylesheet
   Modern, responsiv, Dark/Light. Keine Frameworks nötig.
   ============================================================ */

:root {
  --bg: #0f1220;
  --bg-soft: #171a2b;
  --card: #1c2036;
  --card-2: #232842;
  --border: #2c3252;
  --text: #eef1fb;
  --muted: #9aa3c7;
  --brand: #6c8cff;
  --brand-2: #8a5cf6;
  --accent: #22d3a6;
  --good: #22c55e;
  --good-soft: rgba(34, 197, 94, .14);
  --bad: #ef4444;
  --bad-soft: rgba(239, 68, 68, .14);
  --warn: #f5b301;
  --shadow: 0 18px 40px -18px rgba(0, 0, 0, .65);
  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 760px;
}

[data-theme="light"] {
  --bg: #eef1f8;
  --bg-soft: #e6eaf5;
  --card: #ffffff;
  --card-2: #f4f6fc;
  --border: #dde2f0;
  --text: #141a2e;
  --muted: #5a6485;
  --brand: #4f6ef7;
  --brand-2: #7c4dff;
  --accent: #0ea88a;
  --good: #16a34a;
  --good-soft: rgba(22, 163, 74, .12);
  --bad: #dc2626;
  --bad-soft: rgba(220, 38, 38, .10);
  --shadow: 0 18px 40px -22px rgba(30, 40, 90, .35);
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", sans-serif;
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 15% -10%, rgba(108, 140, 255, .18), transparent 60%),
    radial-gradient(1000px 500px at 100% 0%, rgba(138, 92, 246, .16), transparent 55%),
    var(--bg);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
  min-height: 100%;
}

.app {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px 16px 64px;
}

/* ---------- Header ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 22px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: .2px;
  cursor: pointer;
  background: none;
  border: 0;
  color: var(--text);
  font-size: 1.15rem;
  padding: 4px;
}
.brand .logo {
  width: 34px; height: 34px;
  border-radius: 10px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  box-shadow: 0 6px 16px -6px var(--brand-2);
  font-size: 20px;
}
.topbar .spacer { flex: 1; }

.icon-btn {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text);
  width: 42px; height: 42px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 18px;
  display: grid; place-items: center;
  transition: transform .12s ease, background .2s ease, border-color .2s;
}
.icon-btn:hover { transform: translateY(-1px); border-color: var(--brand); }
.icon-btn:active { transform: translateY(0); }

/* ---------- Cards / generic ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}

.muted { color: var(--muted); }
.center { text-align: center; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 .4em; }
.hidden { display: none !important; }

/* ---------- Hero / dashboard ---------- */
.hero {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  align-items: center;
  margin-bottom: 18px;
}
@media (max-width: 520px) {
  .hero { grid-template-columns: 1fr; text-align: center; justify-items: center; }
}

.ring {
  --p: 0;
  width: 120px; height: 120px;
  border-radius: 50%;
  display: grid; place-items: center;
  background:
    radial-gradient(closest-side, var(--card) 72%, transparent 73% 100%),
    conic-gradient(var(--accent) calc(var(--p) * 1%), var(--border) 0);
  position: relative;
}
.ring .val { font-size: 1.7rem; font-weight: 800; }
.ring .lbl { font-size: .68rem; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }

.hero-text h1 { font-size: 1.5rem; margin-bottom: 4px; }
.hero-text p { margin: 0; color: var(--muted); }

/* ---------- Stat pills ---------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  margin: 16px 0 22px;
}
@media (max-width: 560px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  text-align: center;
}
.stat .n { font-size: 1.35rem; font-weight: 800; }
.stat .k { font-size: .72rem; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; }
.stat.hi .n { color: var(--accent); }

/* ---------- Mode grid ---------- */
.section-title {
  font-size: .8rem; text-transform: uppercase; letter-spacing: .1em;
  color: var(--muted); margin: 22px 4px 10px;
}
.modes { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 560px) { .modes { grid-template-columns: 1fr; } }

.mode {
  text-align: left;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  cursor: pointer;
  color: var(--text);
  display: flex; gap: 14px; align-items: flex-start;
  transition: transform .12s ease, border-color .2s, box-shadow .2s;
  position: relative;
}
.mode:hover { transform: translateY(-2px); border-color: var(--brand); box-shadow: var(--shadow); }
.mode:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.mode .ico {
  font-size: 22px; width: 46px; height: 46px; flex: none;
  display: grid; place-items: center; border-radius: 12px;
  background: var(--card-2);
}
.mode.primary { border-color: var(--brand); background: linear-gradient(135deg, rgba(108,140,255,.16), rgba(138,92,246,.10)); }
.mode.primary .ico { background: linear-gradient(135deg, var(--brand), var(--brand-2)); }
.mode h3 { font-size: 1.02rem; margin: 0 0 3px; }
.mode p { margin: 0; font-size: .84rem; color: var(--muted); }
.badge {
  position: absolute; top: 12px; right: 12px;
  font-size: .68rem; font-weight: 700;
  background: var(--accent); color: #04231b;
  padding: 2px 8px; border-radius: 999px;
}
.badge.soft { background: var(--card-2); color: var(--muted); }

/* ---------- Buttons ---------- */
.btn {
  appearance: none; border: 1px solid var(--border);
  background: var(--card-2); color: var(--text);
  padding: 12px 18px; border-radius: 12px; font-size: .95rem; font-weight: 600;
  cursor: pointer; transition: transform .1s ease, background .2s, border-color .2s;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn.primary { background: linear-gradient(135deg, var(--brand), var(--brand-2)); border-color: transparent; color: #fff; }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--bad); border-color: var(--bad); background: var(--bad-soft); }
.btn.block { width: 100%; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }

/* ---------- Quiz view ---------- */
.quiz-head {
  display: flex; align-items: center; gap: 12px; margin-bottom: 14px;
}
.progress {
  flex: 1; height: 10px; background: var(--card-2);
  border: 1px solid var(--border); border-radius: 999px; overflow: hidden;
}
.progress > span {
  display: block; height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  transition: width .35s ease;
}
.streak {
  display: flex; align-items: center; gap: 6px;
  font-weight: 700; font-size: .95rem;
  background: var(--card); border: 1px solid var(--border);
  padding: 6px 12px; border-radius: 999px;
}
.streak.pulse { animation: pop .4s ease; }
@keyframes pop { 0% { transform: scale(1); } 40% { transform: scale(1.18); } 100% { transform: scale(1); } }

.q-meta { display: flex; justify-content: space-between; color: var(--muted); font-size: .8rem; margin-bottom: 6px; }
.q-cat { text-transform: uppercase; letter-spacing: .08em; }
.q-text { font-size: 1.45rem; font-weight: 700; margin: 4px 0 20px; }
@media (max-width: 520px) { .q-text { font-size: 1.2rem; } }

.answers { display: grid; gap: 12px; }
.answer {
  display: flex; align-items: center; gap: 14px;
  text-align: left; width: 100%;
  background: var(--card); color: var(--text);
  border: 1.5px solid var(--border);
  border-radius: 14px; padding: 15px 16px;
  font-size: 1.02rem; cursor: pointer;
  transition: transform .1s ease, border-color .15s, background .15s;
}
.answer:hover:not(:disabled) { transform: translateY(-1px); border-color: var(--brand); }
.answer:disabled { cursor: default; }
.answer .key {
  flex: none; width: 30px; height: 30px; border-radius: 9px;
  display: grid; place-items: center; font-weight: 800; font-size: .9rem;
  background: var(--card-2); color: var(--muted); border: 1px solid var(--border);
}
.answer.correct { border-color: var(--good); background: var(--good-soft); }
.answer.correct .key { background: var(--good); color: #fff; border-color: var(--good); }
.answer.wrong { border-color: var(--bad); background: var(--bad-soft); }
.answer.wrong .key { background: var(--bad); color: #fff; border-color: var(--bad); }
.answer.chosen { border-color: var(--brand); }
.answer .mark { margin-left: auto; font-size: 1.1rem; opacity: 0; }
.answer.correct .mark, .answer.wrong .mark { opacity: 1; }

.explain {
  margin-top: 16px; padding: 14px 16px;
  border-radius: 14px; border: 1px solid var(--border);
  background: var(--card-2);
  border-left: 4px solid var(--brand);
}
.explain.good { border-left-color: var(--good); }
.explain.bad { border-left-color: var(--bad); }
.explain .h { font-weight: 700; margin-bottom: 4px; display: flex; gap: 8px; align-items: center; }
.explain p { margin: 0; color: var(--muted); font-size: .95rem; }

.quiz-foot { margin-top: 18px; display: flex; gap: 10px; align-items: center; }
.quiz-foot .hint { color: var(--muted); font-size: .8rem; }
@media (max-width: 520px) { .quiz-foot .hint { display: none; } }
kbd {
  font-family: inherit; font-size: .74rem; font-weight: 700;
  background: var(--card-2); border: 1px solid var(--border);
  border-bottom-width: 2px; border-radius: 6px; padding: 1px 6px; color: var(--muted);
}

.timer { font-variant-numeric: tabular-nums; font-weight: 700; }

/* ---------- Flashcard ---------- */
.flash-wrap { perspective: 1400px; }
.flash {
  position: relative; min-height: 260px;
  transform-style: preserve-3d; transition: transform .5s cubic-bezier(.4,.2,.2,1);
  cursor: pointer;
}
.flash.flipped { transform: rotateY(180deg); }
.flash .face {
  position: absolute; inset: 0;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  display: grid; place-items: center; text-align: center;
  padding: 28px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--card); box-shadow: var(--shadow);
}
.flash .back { transform: rotateY(180deg); background: var(--card-2); }
.flash .face .tag { font-size: .72rem; text-transform: uppercase; letter-spacing: .1em; color: var(--muted); margin-bottom: 12px; }
.flash .face .big { font-size: 1.4rem; font-weight: 700; }
.flash .face .small { color: var(--muted); font-size: .95rem; margin-top: 12px; }
.flash-hint { text-align: center; color: var(--muted); font-size: .85rem; margin-top: 14px; }

/* ---------- Result ---------- */
.result-ring { display: grid; place-items: center; margin: 10px 0 18px; }
.big-score { font-size: 3rem; font-weight: 900; }
.result-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 18px 0; }
@media (max-width: 480px){ .result-grid{ grid-template-columns: 1fr 1fr; } }

.review-item {
  border: 1px solid var(--border); border-radius: 12px; padding: 12px 14px; margin-bottom: 10px; background: var(--card-2);
}
.review-item .rq { font-weight: 600; margin-bottom: 6px; }
.review-item .ra { font-size: .9rem; }
.review-item .ra.you { color: var(--bad); }
.review-item .ra.sol { color: var(--good); }

/* ---------- Manage ---------- */
.field { margin-bottom: 12px; }
.field label { display: block; font-size: .82rem; color: var(--muted); margin-bottom: 5px; }
.input, textarea.input, select.input {
  width: 100%; padding: 11px 13px; border-radius: 11px;
  background: var(--card-2); border: 1px solid var(--border); color: var(--text);
  font: inherit;
}
.input:focus { outline: 2px solid var(--brand); outline-offset: 1px; }
.ans-row { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.ans-row input[type="radio"] { width: 20px; height: 20px; accent-color: var(--good); flex: none; }
.q-list { margin-top: 8px; }
.q-list .row {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border: 1px solid var(--border); border-radius: 11px; margin-bottom: 8px; background: var(--card-2);
}
.q-list .row .txt { flex: 1; font-size: .92rem; }
.q-list .row .del { color: var(--bad); background: none; border: none; cursor: pointer; font-size: 1.1rem; }
.chip {
  display: inline-block; font-size: .7rem; padding: 2px 8px; border-radius: 999px;
  background: var(--card); border: 1px solid var(--border); color: var(--muted); margin-left: 6px;
}

/* ---------- Toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: 26px; transform: translateX(-50%) translateY(20px);
  background: var(--card); border: 1px solid var(--border); box-shadow: var(--shadow);
  padding: 12px 18px; border-radius: 12px; opacity: 0; pointer-events: none;
  transition: opacity .25s ease, transform .25s ease; z-index: 50; font-weight: 600;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Confetti ---------- */
#confetti { position: fixed; inset: 0; pointer-events: none; z-index: 40; }

.fade-in { animation: fade .35s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

footer.credit { text-align: center; color: var(--muted); font-size: .78rem; margin-top: 28px; }