/* ===========================================================
   Mathe-Werkstatt — gemeinsames Design (dunkel, violett/blau)
   =========================================================== */

:root {
  --bg:         #0D0E20;   /* Seitengrund */
  --paper:      #1A1C38;   /* Karten */
  --cream:      #14162E;   /* eingelassene Flächen (Bretter, Sammlungen) */
  --line:       #2F3366;   /* Rahmen und Trennlinien */
  --ink:        #ECEDFA;   /* Text */
  --ink-soft:   #9FA3C9;   /* Nebentext */

  --violet:     #7C6BFF;
  --violet-dk:  #5B49D6;
  --violet-lt:  rgba(124, 107, 255, .18);
  --coral:      #FF7E6B;
  --coral-lt:   rgba(255, 126, 107, .16);
  --green:      #3DDC97;
  --green-lt:   rgba(61, 220, 151, .15);
  --yellow:     #FFC94A;
  --yellow-lt:  rgba(255, 201, 74, .14);
  --blue:       #58B6F5;
  --blue-lt:    rgba(88, 182, 245, .15);

  --r-sm: 10px;
  --r-md: 16px;
  --r-lg: 24px;
  --shadow: 0 1px 0 rgba(255,255,255,.05) inset, 0 14px 30px -16px rgba(0,0,0,.9);

  color-scheme: dark;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background:
    radial-gradient(1000px 560px at 12% -12%, rgba(124,107,255,.30), transparent 62%),
    radial-gradient(900px 520px at 92% 4%,   rgba(88,182,245,.20), transparent 58%),
    radial-gradient(700px 500px at 60% 100%, rgba(124,107,255,.10), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  color: var(--ink);
  font-family: ui-rounded, "SF Pro Rounded", "Nunito", "Quicksand",
               system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 18px;
  line-height: 1.55;
  min-height: 100vh;
}

.wrap { max-width: 900px; margin: 0 auto; padding: 24px 20px 80px; }
.wrap-wide { max-width: 1100px; }

h1 { font-size: clamp(28px, 5vw, 42px); line-height: 1.15; margin: 0 0 6px; letter-spacing: -.02em; }
h2 { font-size: clamp(21px, 3vw, 26px); margin: 0 0 10px; letter-spacing: -.01em; }
h3 { font-size: 19px; margin: 0 0 8px; }
p  { margin: 0 0 14px; }

a { color: #A99BFF; }

.lede { font-size: 19px; color: var(--ink-soft); max-width: 62ch; }

/* ---------- Kopfzeile ---------- */
.topbar {
  display: flex; align-items: center; gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 26px;
}
.back {
  display: inline-flex; align-items: center; gap: 8px;
  text-decoration: none; font-weight: 700; font-size: 16px;
  color: var(--ink); background: var(--paper);
  border: 2px solid var(--line); border-radius: 999px;
  padding: 8px 16px 8px 12px;
  transition: transform .12s ease, border-color .12s ease;
}
.back:hover { transform: translateX(-2px); border-color: var(--violet); }

.badge {
  display: inline-block; font-size: 13px; font-weight: 800;
  letter-spacing: .06em; text-transform: uppercase;
  padding: 5px 12px; border-radius: 999px;
  background: var(--violet-lt); color: #B3A7FF;
}
.badge.coral  { background: var(--coral-lt);  color: #FF9C8C; }
.badge.green  { background: var(--green-lt);  color: #6FE8B6; }
.badge.blue   { background: var(--blue-lt);   color: #8CCBF8; }
.badge.yellow { background: var(--yellow-lt); color: #FFD87A; }

/* ---------- Karten ---------- */
.card {
  background: var(--paper);
  border: 2px solid var(--line);
  border-radius: var(--r-lg);
  padding: 22px 24px;
  box-shadow: var(--shadow);
  margin-bottom: 22px;
}
.card.flat { box-shadow: none; }

.panel {
  background: var(--violet-lt);
  border: 1px solid rgba(124,107,255,.28);
  border-radius: var(--r-md);
  padding: 16px 18px;
  margin: 0 0 16px;
}
.panel.hint  { background: var(--yellow-lt); border-color: rgba(255,201,74,.28); }
.panel.good  { background: var(--green-lt);  border-color: rgba(61,220,151,.28); }
.panel.think { background: var(--blue-lt);   border-color: rgba(88,182,245,.28); }

/* ---------- Buttons ---------- */
button { font: inherit; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: none; cursor: pointer;
  background: var(--violet); color: #12132B;
  font-weight: 800; font-size: 17px;
  padding: 12px 22px; border-radius: 999px;
  box-shadow: 0 4px 0 var(--violet-dk);
  transition: transform .08s ease, box-shadow .08s ease, background .15s ease;
  -webkit-tap-highlight-color: transparent;
}
.btn:hover  { background: #8F80FF; }
.btn:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--violet-dk); }
.btn:disabled { opacity: .45; cursor: not-allowed; transform: none; }

.btn.ghost {
  background: var(--paper); color: var(--ink);
  border: 2px solid var(--line); box-shadow: 0 3px 0 rgba(0,0,0,.45);
}
.btn.ghost:hover { border-color: var(--violet); color: #B3A7FF; background: #202346; }
.btn.ghost:active { box-shadow: 0 1px 0 rgba(0,0,0,.45); }

.btn.small { font-size: 15px; padding: 8px 16px; }

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

/* ---------- Eingaben ---------- */
.num-input {
  font: inherit; font-weight: 800; font-size: 24px;
  width: 110px; text-align: center;
  padding: 10px 8px;
  border: 3px solid var(--line); border-radius: var(--r-sm);
  background: var(--cream); color: var(--ink);
}
.num-input:focus { outline: none; border-color: var(--violet); }
.num-input.ok   { border-color: var(--green); background: var(--green-lt); }
.num-input.bad  { border-color: var(--coral); background: var(--coral-lt); }

/* Auswahl-Knöpfe (Multiple Choice) */
.choices { display: grid; gap: 10px; margin: 4px 0 6px; }
.choice {
  text-align: left; cursor: pointer;
  background: var(--cream); color: var(--ink);
  border: 3px solid var(--line); border-radius: var(--r-md);
  padding: 13px 16px; font-size: 17px; font-weight: 600;
  transition: border-color .12s ease, background .12s ease, transform .08s ease;
}
.choice:hover { border-color: var(--violet); transform: translateY(-1px); }
.choice.ok  { border-color: var(--green); background: var(--green-lt); }
.choice.bad { border-color: var(--coral); background: var(--coral-lt); opacity: .8; }
.choice[disabled] { cursor: default; transform: none; }

/* ---------- Rückmeldung ---------- */
.feedback {
  display: none;
  margin-top: 14px; padding: 14px 16px;
  border-radius: var(--r-md); font-weight: 700;
  animation: pop .25s ease;
}
.feedback.show { display: block; }
.feedback.good { background: var(--green-lt); color: #7BE8B8; }
.feedback.bad  { background: var(--coral-lt); color: #FF9C8C; }
.feedback.info { background: var(--blue-lt);  color: #9AD4FF; }

@keyframes pop {
  from { transform: scale(.96); opacity: 0; }
  to   { transform: scale(1);   opacity: 1; }
}

/* ---------- Fortschritt ---------- */
.steps { display: flex; gap: 8px; align-items: center; margin: 0 0 18px; }
.step-dot {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--line); transition: background .2s ease, transform .2s ease;
}
.step-dot.done { background: var(--green); }
.step-dot.now  { background: var(--violet); transform: scale(1.35);
                 box-shadow: 0 0 0 4px rgba(124,107,255,.22); }

.counter {
  font-weight: 800; font-variant-numeric: tabular-nums;
  background: var(--cream); border: 2px solid var(--line);
  border-radius: 999px; padding: 6px 14px; font-size: 16px;
}

/* ---------- Startseite ---------- */
.grid {
  display: grid; gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.tile {
  display: flex; flex-direction: column; gap: 10px;
  text-decoration: none; color: inherit;
  background: var(--paper);
  border: 2px solid var(--line); border-radius: var(--r-lg);
  padding: 22px;
  box-shadow: var(--shadow);
  transition: transform .15s ease, border-color .15s ease, background .15s ease;
}
.tile:hover { transform: translateY(-4px); border-color: var(--violet); background: #202346; }
.tile .icon { font-size: 40px; line-height: 1; }
.tile h3 { margin: 0; font-size: 21px; }
.tile p  { margin: 0; color: var(--ink-soft); font-size: 16px; }

/* ---------- Konfetti ---------- */
.confetti-bit {
  position: fixed; top: -12px; width: 10px; height: 14px;
  pointer-events: none; z-index: 999; border-radius: 2px;
}
@keyframes fall {
  to { transform: translateY(105vh) rotate(720deg); opacity: .9; }
}

/* ---------- Kleinkram ---------- */
.small { font-size: 15px; color: var(--ink-soft); }
.center { text-align: center; }
hr.sep { border: none; border-top: 2px dashed var(--line); margin: 22px 0; }

details.hintbox {
  background: var(--yellow-lt); border: 1px solid rgba(255,201,74,.25);
  border-radius: var(--r-md);
  padding: 12px 16px; margin: 12px 0;
}
details.hintbox summary {
  cursor: pointer; font-weight: 800; color: #FFD87A;
  list-style: none;
}
details.hintbox summary::-webkit-details-marker { display: none; }
details.hintbox summary::before { content: "💡 "; }

svg { touch-action: manipulation; }

@media (max-width: 520px) {
  body { font-size: 17px; }
  .wrap { padding: 16px 14px 60px; }
  .card { padding: 18px 16px; border-radius: var(--r-md); }
}