/* =====================================================
   Variables – LinkedIn light inspired
===================================================== */
:root{
  --bg: #f3f2ef;
  --card: #ffffff;
  --card-alt: #fafafa;
  --text: #1d2226;
  --muted: #5e6c7b;
  --line: #d0d7de;
  --line-strong: #8c96a0;
  --accent: #0a66c2;
  --accent-soft: rgba(10,102,194,.12);
  --error: #d11124;

  --radius: 14px;
  --radius-sm: 10px;

  --cell-size: 46px;
  --cell-size-mini: 56px; /* 6×6 plus grand */
}

/* =====================================================
   Reset / Base
===================================================== */
*{
  box-sizing: border-box;
}

body{
  margin:0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

button, select{
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
}

/* =====================================================
   Layout
===================================================== */
.app{
  max-width: 980px;
  margin: 0 auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ================= HEADER ================= */
.topbar{
  background: var(--card);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.title h1{
  font-size: 18px;
  margin: 0;
}
.title p{
  margin: 2px 0 0;
  font-size: 13px;
  color: var(--muted);
}

.controls{
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

select, button{
  background: var(--card-alt);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
}

button.primary{
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* ================= GAME ================= */
.game{
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 16px;
}

/* ================= BOARD ================= */
.board-container{
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  justify-content: center; /* déjà ok */
}

.board{
  display: grid;
  background: white;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
  --cell-current: var(--cell-size);
}

.cell{
  width: var(--cell-current);
  height: var(--cell-current);
  border: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 20px;
/*  cursor: pointer;
  position: relative;*/
}

.cell.given{
  background: #f8f9fa;
  font-weight: 700;
}

.cell.given .value{
  color: #909090;
  font-weight: 600;
}

.cell:not(.given) .value{
  color: #1a1a1a;
  font-weight: 700;
}

.cell.selected{
  background: var(--accent-soft);
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.cell.peer{
  background: rgba(10,102,194,.06);
}

.cell.error{
  background: rgba(209,17,36,.12);
  outline: 2px solid var(--error);
  outline-offset: -2px;
}

/* Traits épais des blocs */
.cell.block-right{
  border-right: 2px solid var(--line-strong);
}
.cell.block-bottom{
  border-bottom: 2px solid var(--line-strong);
}

/* Notes */
.notes{
  position: absolute;
  inset: 4px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  font-size: 10px;
  color: var(--muted);
  pointer-events: none;
}

/* ================= SIDEBAR ================= */
.sidebar{
  background: var(--card);
  border-radius: var(--radius);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message{
  background: var(--card-alt);
  border-radius: var(--radius-sm);
  padding: 10px;
  font-size: 13px;
}

.message span{
  display: block;
  margin-top: 4px;
  color: var(--muted);
}

.actions{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.actions button[data-on="true"]{
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* ================= KEYPAD ================= */
.keypad{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.keypad button{
  height: 44px;
  font-size: 16px;
  font-weight: 600;
  background: var(--card-alt);
  border-radius: var(--radius-sm);
}

/* =====================================================
   Responsive
===================================================== */
@media (max-width: 860px){
  .game{
    grid-template-columns: 1fr;
  }

  .keypad{
    grid-template-columns: repeat(6, 1fr);
  }

  :root{
    --cell-size: 42px;
  }
}

@media (max-width: 860px){
  .board-container{
    padding-left: 0;
    padding-right: 0;
  }

  .board{
    margin-left: auto;
    margin-right: auto;
  }
}