:root {
  --bg: #fdf6e3;
  --panel: #ffffff;
  --panel-border: #e2cfa0;
  --text: #1a1a2e;
  --muted: #6b6b8a;
  --gold: #c67c00;
  --green-ok: #1a7a3e;

  --color-B: #c0392b;
  --color-I: #c67c00;
  --color-N: #0060a8;
  --color-G: #1a7a3e;
  --color-O: #7b1fa2;

  --linie-waagerecht: #c0392b;
  --linie-senkrecht: #0060a8;
  --linie-diagonal: #1a7a3e;
  --linie-diagonal-hell: #3f9e63;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", Arial, Helvetica, sans-serif;
  overflow: hidden;
}

body {
  display: flex;
  flex-direction: column;
}

/* ---------- Steuerung ---------- */

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  padding: 16px;
  background: var(--panel);
  border-bottom: 3px solid var(--panel-border);
  flex: 0 0 auto;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.btn {
  font-size: 1.6rem;
  font-weight: 700;
  padding: 16px 40px;
  border-radius: 14px;
  border: none;
  cursor: pointer;
  color: #ffffff;
  transition: transform 0.08s ease, opacity 0.15s ease, box-shadow 0.1s ease;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.btn:active:not(:disabled) {
  transform: scale(0.96);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.15);
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.35;
  background: #b0b8c8 !important;
  color: #ffffff !important;
  box-shadow: none !important;
}

.btn-neu     { background: var(--green-ok); }
.btn-ziehen  { background: #e08000; }
.btn-manuell { background: #8a8a9a; }
.btn-manuell.active { background: var(--color-N); box-shadow: 0 0 0 3px rgba(0, 96, 168, 0.35), 0 4px 10px rgba(0, 0, 0, 0.2); }
.btn-abbruch { background: #c0392b; }
.btn-doc     { background: var(--color-N); }
.btn-doc    { background: #7b1fa2; }

.btn-erklaerung {
  background: var(--gold);
  font-size: 1.1rem;
  padding: 10px 22px;
}

/* ---------- Hauptbereich ---------- */

.content {
  flex: 1 1 auto;
  display: flex;
  min-height: 0;
}

/* ---------- Links: große Anzeige ---------- */

.draw-display {
  flex: 1.4 1 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at center, #fffde7 0%, #fdf0c0 60%, #fce8a0 100%);
  border-right: 3px solid var(--panel-border);
}

.draw-display .letter {
  font-size: 14vw;
  font-weight: 900;
  line-height: 1;
  color: var(--gold);
  text-shadow: 0 3px 12px rgba(198, 124, 0, 0.3);
}

.draw-display .number {
  font-size: 26vw;
  font-weight: 900;
  line-height: 1;
  color: var(--text);
  text-shadow: 0 4px 18px rgba(0, 0, 0, 0.12);
}

.draw-display .number:empty::before {
  content: "Bereit";
  font-size: 5vw;
  font-weight: 700;
  color: var(--muted);
  text-shadow: none;
}

.draw-display.flash {
  animation: flash 0.4s ease;
}

@keyframes flash {
  0%   { background: rgba(255, 213, 74, 0.65); }
  100% { background: transparent; }
}

.draw-display.error-flash {
  animation: errorFlash 0.4s ease;
}

@keyframes errorFlash {
  0%   { background: rgba(220, 50, 50, 0.55); }
  100% { background: transparent; }
}

.mode-hint {
  min-height: 1.4em;
  margin-top: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-N);
  text-align: center;
}

/* ---------- Rechts: Tafel ---------- */

.board {
  flex: 1 1 0;
  display: flex;
  flex-direction: column;
  padding: 20px 24px;
  gap: 12px;
  overflow-y: auto;
  background: var(--bg);
}

.board-row {
  display: flex;
  align-items: center;
  background: var(--panel);
  border: 2px solid var(--panel-border);
  border-radius: 12px;
  padding: 10px 14px;
  gap: 14px;
  flex: 1 1 0;
  min-height: 0;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.07);
}

.board-letter {
  font-size: 2.4rem;
  font-weight: 900;
  width: 1.1em;
  text-align: center;
  flex: 0 0 auto;
}

.letter-B { color: var(--color-B); }
.letter-I { color: var(--color-I); }
.letter-N { color: var(--color-N); }
.letter-G { color: var(--color-G); }
.letter-O { color: var(--color-O); }

.board-numbers {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-content: center;
}

.num-chip {
  font-size: 1.15rem;
  font-weight: 700;
  padding: 4px 9px;
  border-radius: 6px;
  background: #ede8da;
  color: var(--muted);
}

.num-chip.drawn {
  color: #ffffff;
}

/* Gezogene Chips erhalten die Farbe ihrer Spalte */
#row-B .num-chip.drawn { background: var(--color-B); }
#row-I .num-chip.drawn { background: var(--color-I); }
#row-N .num-chip.drawn { background: var(--color-N); }
#row-G .num-chip.drawn { background: var(--color-G); }
#row-O .num-chip.drawn { background: var(--color-O); }

.num-chip.latest {
  outline: 3px solid var(--text);
  outline-offset: 1px;
}

.board-info {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 8px;
  border-top: 2px solid var(--panel-border);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text);
}

.board-info span {
  color: var(--gold);
  font-weight: 900;
}

/* ---------- kleinere Bildschirme ---------- */

@media (max-width: 900px) {
  .content { flex-direction: column; }
  .draw-display { border-right: none; border-bottom: 3px solid var(--panel-border); padding: 20px 0; }
  .draw-display .letter { font-size: 20vw; }
  .draw-display .number { font-size: 34vw; }
  .btn { font-size: 1.1rem; padding: 12px 20px; }
}

/* ---------- Erklärung (Overlay über dem Spiel) ---------- */

.erklaerung-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2.2vh;
  padding: 2.5vh 16px;
  cursor: pointer;
  overflow-y: auto;
}

.erklaerung-overlay[hidden] { display: none; }

.erklaerung-close {
  position: absolute;
  top: 14px;
  right: 18px;
  width: 56px;
  height: 56px;
  border: none;
  border-radius: 50%;
  background: #8a8a9a;
  color: #ffffff;
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.erklaerung-titel {
  margin: 0;
  text-align: center;
  font-size: clamp(1.6rem, 5vh, 3.2rem);
  font-weight: 900;
  color: var(--gold);
}

.erklaerung-text {
  margin: 0;
  max-width: 900px;
  text-align: center;
  font-size: clamp(1rem, 2.6vh, 1.6rem);
  font-weight: 600;
  color: var(--text);
}

.erklaerung-weiter {
  margin: 0;
  text-align: center;
  font-size: clamp(0.9rem, 2.2vh, 1.3rem);
  font-weight: 700;
  color: var(--muted);
}

/* ---------- Der Bingozettel ---------- */

.zettel {
  flex: 0 0 auto;
  width: min(54vh, 92vw);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.18);
}

.zettel-kopf {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  background: linear-gradient(180deg, #4a74b4 0%, #163866 100%);
  border: 2px solid #1a1a2e;
}

.zettel-kopf span {
  padding: 0.12em 0;
  text-align: center;
  color: #ffffff;
  font-size: clamp(1.4rem, 5vh, 3rem);
  font-weight: 900;
}

.zettel-feld {
  position: relative;
}

.zettel-gitter {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border: 2px solid #1a1a2e;
  border-top: none;
  background: #ffffff;
}

.zettel-zelle {
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-right: 2px solid #1a1a2e;
  border-bottom: 2px solid #1a1a2e;
  font-size: clamp(1.1rem, 4.4vh, 2.6rem);
  font-weight: 900;
  transition: background 0.25s ease, color 0.25s ease;
}

.zettel-zelle:nth-child(5n)   { border-right: none; }
.zettel-zelle:nth-child(n+21) { border-bottom: none; }

.zettel-zelle.markiert { color: #ffffff; }
.zettel-zelle.markiert.farbe-waagerecht { background: var(--linie-waagerecht); }
.zettel-zelle.markiert.farbe-senkrecht  { background: var(--linie-senkrecht); }
.zettel-zelle.markiert.farbe-diagonal   { background: var(--linie-diagonal); }
.zettel-zelle.markiert.farbe-diagonal-hell { background: var(--linie-diagonal-hell); }

/* Die Zahl in der Mitte liegt auf beiden Diagonalen und bekommt deshalb
   beide Farben - diagonal geteilt, passend zu den beiden Linien. */
.zettel-zelle.markiert.farbe-diagonal.farbe-diagonal-hell {
  background: linear-gradient(135deg, var(--linie-diagonal) 0 50%, var(--linie-diagonal-hell) 50% 100%);
}

.zettel-nummer {
  padding-top: 4px;
  text-align: right;
  font-size: clamp(0.7rem, 1.6vh, 1rem);
  color: var(--muted);
}

/* ---------- Schritt 5: vier Linien als Rahmen über dem Zettel ---------- */

.zettel-linien {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.zettel-linien[hidden] { display: none; }

.linie {
  position: absolute;
  border: 6px solid;
  border-radius: 999px;
  transition: top 0.35s ease, left 0.35s ease;
}

.linie-waagerecht {
  border-color: var(--linie-waagerecht);
  left: -1%;
  width: 102%;
  top: 40%;
  height: 20%;
}

.linie-senkrecht {
  border-color: var(--linie-senkrecht);
  top: -1%;
  height: 102%;
  left: 40%;
  width: 20%;
}

/* Die Diagonalen sind um 45° gedrehte Rahmen. Länge und Dicke zusammen
   müssen unter 141% bleiben (der Diagonale des Zettels), sonst stehen die
   Ecken des gedrehten Rahmens über den Zettelrand hinaus. */
.linie-diagonal1,
.linie-diagonal2 {
  left: 50%;
  top: 50%;
  width: 126%;
  height: 18%;
}

.linie-diagonal1,
.linie-diagonal2 {
  border-color: var(--linie-diagonal);
}

.linie-diagonal1 { transform: translate(-50%, -50%) rotate(45deg); }
.linie-diagonal2 { transform: translate(-50%, -50%) rotate(-45deg); }

/* ---------- Legende ---------- */

.erklaerung-legende {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 22px;
  max-width: 100%;
  font-size: clamp(0.9rem, 2.2vh, 1.3rem);
  font-weight: 700;
  color: var(--text);
}

.erklaerung-legende[hidden] { display: none; }

.legende-eintrag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.legende-punkt {
  width: 1.1em;
  height: 1.1em;
  border-radius: 4px;
}

.legende-punkt.farbe-waagerecht { background: var(--linie-waagerecht); }
.legende-punkt.farbe-senkrecht  { background: var(--linie-senkrecht); }
.legende-punkt.farbe-diagonal   { background: var(--linie-diagonal); }

@media (max-width: 900px) {
  .btn-erklaerung { font-size: 0.95rem; padding: 10px 14px; }
}

@media (max-width: 900px) {
  /* Schließen-Knopf nicht über die Überschrift legen */
  .erklaerung-overlay { padding-top: 64px; justify-content: flex-start; }
  .erklaerung-close { width: 44px; height: 44px; font-size: 1.5rem; top: 10px; right: 10px; }
}