/* ── SUDOKU PAGE ── */
.sudoku-page {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.25rem 3rem;
}

/* Header */
.sudoku-header {
    margin-bottom: 1.75rem;
}
.sudoku-breadcrumb {
    display: flex;
    align-items: center;
    gap: .4rem;
    font-size: .8rem;
    color: var(--muted);
    margin-bottom: .75rem;
    flex-wrap: wrap;
}
.sudoku-breadcrumb a { color: var(--muted); text-decoration: none; }
.sudoku-breadcrumb a:hover { color: var(--primary); }
.sudoku-breadcrumb span { opacity: .5; }

.sudoku-title {
    font-size: 1.55rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: .6rem;
    line-height: 1.3;
}

.sudoku-meta-bar {
    display: flex;
    align-items: center;
    gap: .85rem;
    flex-wrap: wrap;
    font-size: .85rem;
    color: var(--muted);
    margin-bottom: .6rem;
}
.sudoku-diff-badge {
    display: inline-flex;
    align-items: center;
    padding: .2rem .65rem;
    border-radius: 20px;
    font-size: .78rem;
    font-weight: 700;
    border: 1px solid transparent;
}
.sudoku-desc {
    font-size: .9rem;
    color: var(--text2);
    line-height: 1.6;
    margin-top: .5rem;
}

/* Play area */
.sudoku-play-wrap {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
}

/* Controls bar */
.sudoku-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: space-between;
    width: 100%;
    max-width: 480px;
}
.sudoku-timer {
    font-family: 'Orbitron', monospace;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--dark);
    letter-spacing: .08em;
}
.sudoku-ctrl-btns {
    display: flex;
    gap: .5rem;
}
.sudoku-ctrl-btn {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1.5px solid var(--border);
    background: #fff;
    color: var(--text2);
    cursor: pointer;
    font-size: .95rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all .15s;
}
.sudoku-ctrl-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-l);
}
.sudoku-ctrl-btn--danger:hover {
    border-color: var(--red);
    color: var(--red);
    background: #fef2f2;
}
.sudoku-ctrl-btn--disabled,
.sudoku-ctrl-btn:disabled {
    opacity: .4;
    cursor: not-allowed;
    pointer-events: none;
}

/* Hint counter badge */
.sudoku-ctrl-btn {
    position: relative;
}
.hint-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background: var(--primary);
    color: #fff;
    font-size: .6rem;
    font-weight: 700;
    min-width: 16px;
    height: 16px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 3px;
    line-height: 1;
    pointer-events: none;
}

/* Grid */
.sudoku-grid-wrap {
    display: flex;
    justify-content: center;
}
.sudoku-grid {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    border: 2.5px solid var(--dark2);
    border-radius: 4px;
    width: min(480px, 95vw);
    height: min(480px, 95vw);
    overflow: hidden;
}
.sudoku-cell {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: clamp(.75rem, 2.5vw, 1.05rem);
    font-weight: 600;
    border: 1px solid #d1d5db;
    cursor: default;
    user-select: none;
    transition: background .1s;
    position: relative;
}
.sudoku-cell.box-top    { border-top-width: 2px; border-top-color: var(--dark3); }
.sudoku-cell.box-bottom { border-bottom-width: 2px; border-bottom-color: var(--dark3); }
.sudoku-cell.box-left   { border-left-width: 2px; border-left-color: var(--dark3); }
.sudoku-cell.box-right  { border-right-width: 2px; border-right-color: var(--dark3); }

.cell-given {
    background: #f3f4f6;
    color: var(--dark);
    cursor: default;
}
.cell-empty {
    background: #fff;
    color: #1d4ed8;
    cursor: pointer;
}
.cell-empty:hover { background: #eff6ff; }
.cell-selected { background: #dbeafe !important; color: #1e40af !important; }
.cell-highlight { background: #f0f9ff; }
.cell-same-num  { background: #e0f2fe; }

.cell-wrong   { color: var(--red) !important; background: #fef2f2 !important; }
.cell-correct { color: #15803d; }
.cell-hint    { animation: hintPulse .5s ease; }
.cell-revealed { color: var(--muted) !important; }

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

/* Number pad */
.sudoku-numpad {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: .35rem;
    width: 100%;
    max-width: 480px;
}
.numpad-btn {
    height: 46px;
    border-radius: 10px;
    border: 1.5px solid var(--border);
    background: #fff;
    color: var(--dark);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all .15s;
}
.numpad-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-l);
}
.numpad-btn--active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

/* Success overlay */
.sudoku-success-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.55);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
}
.sudoku-success-box {
    background: #fff;
    border-radius: 18px;
    padding: 2.5rem 2rem;
    text-align: center;
    max-width: 360px;
    width: 100%;
    box-shadow: 0 24px 64px rgba(0,0,0,.2);
}
.success-icon {
    font-size: 3.5rem;
    color: var(--gold);
    margin-bottom: .75rem;
}
.sudoku-success-box h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: .5rem;
    color: var(--dark);
}
.success-time {
    font-family: 'Orbitron', monospace;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: .35rem;
}
.sudoku-success-box p {
    color: var(--muted);
    font-size: .9rem;
    margin-bottom: 1.5rem;
}
.success-actions {
    display: flex;
    gap: .75rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Responsive */
@media (max-width: 520px) {
    .sudoku-title { font-size: 1.2rem; }
    .sudoku-timer { font-size: 1.1rem; }
    .numpad-btn   { height: 38px; font-size: .95rem; }
    .sudoku-ctrl-btn { width: 36px; height: 36px; }
}