:root {
  --primary: #991fef;
  --secondary: #00c2a8;
  --bg: #1e1e2f;
  --text: white;
  --accent: #b8f1f1;
  --border: #444;
  --sucess: #80ed99;
  --error: #ff6b6b;
}


/* Basic Body-Styling */
body {
  margin: 0;
  background-color: var(--bg); /* dunkles Grau */
  font-family: 'Roboto Condensed', sans-serif;
  color: white;
  height: 100vh;
  overflow: hidden;
}

.desktop {
  padding: 20px;
}

/* Buttons */
.icon-button {
  background-color: var(--secondary);
  color: white;
  border: 1px solid var(--border);
  padding: 10px 16px;
  margin-right: 10px;
  cursor: pointer;
  font-size: 14px;
  border-radius: 4px;
  transition: background-color 0.2s;
}

.icon-button:hover {
  background-color: var(--accent);
}

/* Window-Basiclayout */
.window {
  position: absolute;
  top: 120px;
  left: 120px;
  background-color: var(--bg);
  border: 1px solid var(--border);
  box-shadow: 4px 4px 10px rgba(0,0,0,0.5);
  z-index: 10;
  min-width: 300px;
  min-height: 200px;
  width: 480px;
  height: 320px;
  resize: both;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  margin: 2px;
}


.window.hidden {
  display: none;
}

/* Window Header */
.window-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--primary); 
  padding: 8px 12px;
  font-weight: bold;
  cursor: move;
  user-select: none;
  color: white;
}

/* Window Content */
.window-content {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 12px;
  box-sizing: border-box;
  overflow: auto;   
  margin: 21px;
}

/* Making the content area scrollable */
.content-area {
  flex: 1;
  overflow: auto;
  min-height: 0;
}

/* Centered Buttons ordering */
.center-buttons {
  display: flex;
  flex-direction: row;
  justify-content: flex-start;
  align-items: flex-end;
  gap: 16px;
  margin-top: 12px;
  overflow-x: auto;      
  overflow-y: hidden;
  white-space: nowrap;  
  padding-bottom: 4px;   
}

/* Close button (Window X) */
.window-header button {
  background: transparent;
  border: none;
  color: white;
  font-weight: bold;
  cursor: pointer;
  font-size: 14px;
}

.window-header button:hover {
  color: black;
}
/* Blackjack Window extra */
#blackjackWindow {
  position: absolute;
  min-width: 460px;
  min-height: 230px;
  overflow:auto;
}

/* Blackjack Window Rules */
#blackjackWindow .rules-btn {
  position: absolute;
  top: 45px;      
  right: 12px;   
  z-index: 2;
  background: var(--secondary);
  color: white;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 6px 14px;
  font-size: 14px;
  cursor: pointer;
}

#blackjackWindow .rules-btn:hover {
  background: var(--accent);
  color: black;
}

/* Blackjack Window Buttons */
#blackjackWindow .window-content > div:nth-child(2) button {
  background-color: var(--secondary);
  color: white;
  border: 1px solid var(--border);
  padding: 8px 16px;
  margin-right: 8px;
  cursor: pointer;
  font-size: 12px;
  border-radius: 4px;
  transition: background-color 0.2s;
  min-width: 90px;
}

#blackjackWindow .window-content > div:nth-child(2) button:hover {
  background-color: var(--accent);
  color: black;
}

#blackjackWindow .window-content > div:nth-child(2) button:disabled {
  background-color: var(--error);
  color: black;
  border-color: var(--error);
  opacity: 1;
  cursor: not-allowed;
}

.window-content p {
  margin: 2px 0;
}

/* Window Content Headings and lists distance */
.window-content h2 + ul,
.window-content h2 + dl {
  margin-top: 2px;
  margin-bottom: 12px;
}

dl {
  margin: 0 0 12px 0;
}

.toggle-heading {
  color: var(--secondary);
  transition: color 0.2s;
  user-select: none;
}

.toggle-heading.active {
  color: var(--primary);
}

.toggle-heading .arrow {
  display: inline-block;
  width: 18px;
  transition: transform 0.2s;
  font-size: 1.1em;
}

.window-content a,
.window-content a:visited {
  color: var(--secondary); 
  text-decoration: underline;
  transition: color 0.2s;
}

.window-content a:hover {
  color: var(--accent); 
}


/* --- Sudoku Styles --- */

#sudokuWindow {
  width: 850px;
  height: 750px;
  min-width: 600px;
  min-height: 420px;
}

.sudoku-board {
  min-height: 22.75rem;
  margin-top: 3px;
  margin-bottom: 1em;
}

.sudoku-board-cell {
  display: inline-block;
  position: relative;
  border: 1px solid #888; 
  background: var(--bg);
  max-width: 11.11111%;
}

[data-board-size="9"].sudoku-board .sudoku-board-cell:nth-of-type(9n+1) {
  border-left-width: 2px;
  border-left-color: white;
}

[data-board-size="9"].sudoku-board .sudoku-board-cell:nth-of-type(n):nth-of-type(-n+9) {
  border-top-width: 2px;
  border-top-color: white;
}

[data-board-size="9"].sudoku-board .sudoku-board-cell:nth-of-type(3n) {
  border-right-width: 2px;
  border-right-color: white;
}

[data-board-size="9"].sudoku-board .sudoku-board-cell:nth-of-type(n+19):nth-of-type(-n+27),
[data-board-size="9"].sudoku-board .sudoku-board-cell:nth-of-type(n+46):nth-of-type(-n+54),
[data-board-size="9"].sudoku-board .sudoku-board-cell:nth-of-type(n+73):nth-of-type(-n+81) {
  border-bottom-width: 2px;
  border-bottom-color: white;
}

.sudoku-board-cell input {
  background: none;
  font-size: 19.2px;
  font-size: 1.2rem;
  color: white;
  text-align: center;
  width: 2em;
  max-width: 100%;
  height: 2em;
  border: 0;
  position: relative;
  z-index: 1;
}

.sudoku-board-cell .highlight-val {
  color: var(--secondary);
}

.sudoku-board-cell .board-cell--error {
  background: #d00;
  color: #eee;
}

.sudoku-board-cell .candidates {
  display: none;
  position: absolute;
  top: 0; bottom: 0; left: 0; right: 0;
  text-align: center;
  font-size: .75em;
  letter-spacing: -.5px;
  font-family: monospace, sans-serif;
  line-height: 0;
  text-align: justify;
}

.sudoku-board .candidates:after {
  content: "";
  display: inline-block;
  width: 100%;
}

@media(max-width: 23em){
  .sudoku-board .candidates {
    letter-spacing: -2px;
  }
}
.showCandidates .candidates {
  display: block;
}

.sudoku-board .candidates div {
  display: inline-block;
  width: 20%;
  line-height: 1.13;
  vertical-align: top;
}

.candidate--highlight {
  background-color: yellow;
}
.candidate--to-remove {
  background-color: red;
  color: white;
}

.sudokubutton1,.sudokubutton2,.sudokubutton3,.sudokubutton4,
.sudokubutton5,.sudokubutton6,.sudokubutton7 {
  color: white;
  -webkit-transition-duration: 0.3s;
  transition-duration: 0.3s;
  padding: 1px 6px;
}
.sudokubutton1 {
  background-color: #3cbf71;
}
.sudokubutton2 {
  background-color: #ff9224;
}
.sudokubutton3 {
  background-color: #ff3c3c;
}
.sudokubutton4 {
  background-color: #020202;
}
.sudokubutton5,.sudokubutton6 {
  background-color: #4040ff;
}
.sudokubutton7 {
  background-color: #899db6;
}
.sudokubutton1:hover,.sudokubutton2:hover,.sudokubutton3:hover,.sudokubutton4:hover,
.sudokubutton5:hover,.sudokubutton6:hover,.sudokubutton7:hover {
  background-color: #EDEDED;
  color: black;
  cursor: pointer;
}

.wrap {
  padding: 2em 1em;
  width: 400px;
  max-width: 100%;
  margin-left: auto;
  margin-right: auto;
}

@media(min-width: 30em) {
  .wrap {
    width: 490px;
  }
  .sudoku-board input {
    font-size: 24px;
    font-size: 1.5rem;
  }
  .sudoku-board .candidates {
    font-size: .8em;
  }
}