@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;600;700&display=swap');

:root {
  --background:   #0d0d0d;
  --surface:      #161616;
  --border:       #2a2a2a;
  --border-box:   #444;
  --text:         #e8e8e8;
  --text-dim:     #666;
  --mine:         #00e5a0;   /* player's correct cells  */
  --opponent:     #ff6b6b;   /* opponent's correct cells */
  --given:        #9a9a9a;   /* pre-filled puzzle cells  */
  --wrong:        #ff3333;
  --accent:       #ffffff;
  --cell-size:    min(52px, 10vw);
  --opponent-selection: rgba(255, 107, 107, 0.10);
  --player-selection:   rgba(0, 229, 160, 0.10);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--background);
  color: var(--text);
  font-family: 'IBM Plex Mono', monospace;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
}

h1 {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: 0.2em;
}

/* Screens */

#screen-username, /* NEW */
#screen-home,
#screen-game,

#screen-gameover {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  text-align: center;
}

#screen-home button {
    margin-top: 24px;
}

#screen-waiting {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}


/* Home */

#screen-home h1 {
  color: var(--accent);
}


#screen-username h1 {
      color: var(--accent);
}

/* Waiting */

.waiting-text {
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: var(--text);
}

.spinner {
  align-self: center;
  width: 32px;
  height: 32px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Buttons */

button {
  background: var(--accent);
  color: var(--background);
  border: none;
  padding: 12px 36px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  cursor: pointer;
  text-transform: uppercase;
  transition: opacity 0.15s;
}

button:hover { opacity: 0.85; }

.btn-secondary {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border);
}

.btn-secondary:hover { color: var(--text); border-color: var(--text-dim); }

input[type="text"] {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 12px 24px;
  font-family: inherit;
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  width: 100%;
  max-width: 300px;
  text-align: center;
  outline: none;
  transition: border-color 0.15s;
}

input[type="text"]:focus {
  border-color: var(--accent);
}

input[type="text"]::placeholder {
  color: var(--text-dim);
}

/* Numpad */

.numpad {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    /* border: 2px solid var(--border-box); */
    gap: 6px;
    width: 100%;
    max-width: calc(var(--cell-size) * 9);
}

.numpad-key {
    background: var(---background);
    color: var(--text-dim);
    border: 1px solid var(--border);
    padding: 12px 0;
    font-size: 1.1rem;
}

/* Scoreboard */

.scoreboard {
  display: flex;
  gap: 48px;
}

.score {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.score-label {
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-dim);
}

.score-value {
  font-size: 2rem;
  font-weight: 700;
}

.lives {
    font-size: 0.9rem;
    letter-spacing: 0.2em;
}

.lives-mine {color: var(--mine); }
.lives-opponent {color: var(--opponent); }

.score-mine  .score-value { color: var(--mine); }
.score-opponent .score-value { color: var(--opponent); }

/* Board */

#screen-game h1 {
    color: var(--text-dim);
}

.board {
  display: grid;
  grid-template-rows: repeat(9, var(--cell-size));
  border: 2px solid var(--border-box);
  gap: 0;
}

.board-row {
  display: grid;
  grid-template-columns: repeat(9, var(--cell-size));
}

/* Draw thick borders at 3x3 box boundaries */
.board-row:nth-child(3n) .cell { border-bottom: 2px solid var(--border-box); }
.board-row .cell:nth-child(3n) { border-right:  2px solid var(--border-box); }

.cell {
  width:  var(--cell-size);
  height: var(--cell-size);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: 600;
  cursor: default;
  outline: none;
  transition: background 0.1s;
  user-select: none;
}

.cell-given    { color: var(--given); }
.cell-empty    { cursor: pointer; }
.cell-empty:hover { background: var(--surface); } /* .cell-empty:focus, */
.cell-mine     { color: var(--mine);     background: rgba(0,229,160,0.08); }
.cell-opponent { color: var(--opponent); background: rgba(255,107,107,0.08); }
.cell-selected { background: var(--player-selection); } 
.cell-opponent-selected { background: var(--opponent-selection); }
.cell-selected.cell-opponent-selected { background: rgba(128, 168, 130, 0.15); }

.cell-wrong {
  background: rgba(255,51,51,0.2);
  animation: wrong-flash 0.5s ease;
}


@keyframes wrong-flash {
  0%   { background: rgba(255,51,51,0.5); }
  100% { background: rgba(255,51,51,0.0); }
}

/* Hint */

.hint {
  font-size: 0.75rem;
  color: var(--text-dim);
  letter-spacing: 0.08em;
}

/* Game over */

h2 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.15em;
}   

.gameover-scores {
  font-size: 1.5rem;
  color: var(--text-dim);
}

/* Animation */

@keyframes wobble {
  0%   { transform: scale(1); }
  30%  { transform: scale(1.4); }
  60%  { transform: scale(0.9); }
  100% { transform: scale(1); }
}

.wobble {
  animation: wobble 0.3s ease;
}