/* ── Grid hint (matches sudoku-solver.css) ─────────────────────────────────── */
.grid-hint {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    pointer-events: none; z-index: 5;
    transition: opacity .4s ease;
}
.grid-hint.hidden { opacity: 0; pointer-events: none; }
.grid-hint span {
    font-size: 14px; color: var(--muted); text-align: center;
    line-height: 1.6; padding: 20px;
    background: rgba(255,255,255,.9);
    backdrop-filter: blur(4px); border-radius: 10px;
}

/* ── Magic Square Grid ─────────────────────────────────────────────────────── */
.magic-grid {
    width: min(94vw, 420px);
    aspect-ratio: 1;
    display: grid;
    border: 2.5px solid var(--accent);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 2px 20px var(--accent-glow), 0 8px 32px rgba(0,0,0,.06);
    background: var(--border);
    gap: 1px;
    position: relative;
    container-type: inline-size;
}

/* Magic info bar */
.magic-info {
    font-family: 'Space Grotesk', sans-serif;
    font-size: .95rem;
    color: var(--muted);
    margin-bottom: .5rem;
    text-align: center;
}
.magic-info strong { color: var(--accent); }

/* ── Magic cells ──────────────────────────────────────────────────────────── */
.m-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--card);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 7cqi;
    font-weight: 600;
    cursor: pointer;
    transition: background .1s;
    user-select: none;
    -webkit-user-select: none;
    position: relative;
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    color: var(--fg);
    -webkit-tap-highlight-color: transparent;
    min-height: 0; min-width: 0;
}
.m-cell:hover      { background: var(--card-hover); }
.m-cell.given      { background: rgba(194,65,12,.05); }
.m-cell.user       { color: var(--accent); }
.m-cell.solver-fill{ color: var(--success); }
.m-cell.error-cell { color: var(--error) !important; background: var(--error-bg) !important; }
.m-cell.selected   { background: var(--accent-glow) !important; box-shadow: inset 0 0 0 2px var(--accent); z-index: 2; }
.m-cell.highlighted{ background: rgba(194,65,12,.04); }
/* Line complete — entire row/col/diag reached magic sum */
.m-cell.line-complete { background: rgba(22,163,74,.12) !important; }
.m-cell.solved-cell   { color: var(--success) !important; animation: cellPop .3s cubic-bezier(.34,1.56,.64,1); }

/* diagonal tint */
.m-cell.on-diagonal   { background: rgba(194,65,12,.05); }
.m-cell.on-diagonal.selected { background: var(--accent-glow) !important; }

@keyframes cellPop {
    0%  { transform: scale(1); }
    50% { transform: scale(1.2); }
    100%{ transform: scale(1); }
}

@media (max-width: 480px) {
    .magic-grid { width: min(96vw, 420px); }
}