/* ==========================================================================
   Futoshiki Stylesheet
   ========================================================================== */

.futoshiki-board-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
}

.futoshiki-grid {
    display: grid;
    gap: 4px;
    width: 100%;
    max-width: 440px;
    margin: 0 auto;
    padding: 8px;
    box-sizing: border-box;
}

/* 1. Ziffernzellen */
.futoshiki-cell {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card, #2b3035);
    border: 2px solid var(--border-color, rgba(255, 255, 255, 0.12));
    border-radius: 10px;
    font-size: clamp(18px, 5vw, 28px);
    font-weight: 700;
    color: var(--accent-primary, #4dabf7);
    cursor: pointer;
    position: relative;
    transition: all 0.15s ease;
    user-select: none;
}

.futoshiki-cell:hover {
    border-color: var(--accent-primary, #4dabf7);
    transform: scale(1.02);
}

.futoshiki-cell:active {
    transform: scale(0.96);
}

/* Fixierte Startziffern */
.futoshiki-cell.cell-locked {
    background: var(--cell-locked-bg, rgba(255, 255, 255, 0.05));
    color: var(--text-primary, #f8f9fa);
    font-weight: 900;
}

/* Ausgewählte Zelle */
.futoshiki-cell.selected {
    border-color: var(--accent-primary, #4dabf7);
    box-shadow: 0 0 0 3px rgba(77, 171, 247, 0.35);
    background: rgba(77, 171, 247, 0.15);
    transform: scale(1.03);
    z-index: 2;
}

/* Zeile/Spalte Fadenkreuz */
.futoshiki-cell.highlight-related {
    background: rgba(255, 255, 255, 0.04);
}

/* Gleiche Zahl Hervorhebung */
.futoshiki-cell.highlight-same-val {
    background: rgba(255, 212, 59, 0.15);
    border-color: rgba(255, 212, 59, 0.5);
}

/* Konflikt (Duplikat) */
.futoshiki-cell.conflict {
    border-color: #ff6b6b !important;
    background: rgba(255, 107, 107, 0.2) !important;
    color: #ff6b6b !important;
    animation: futoshiki-shake 0.35s ease;
}

/* Hint-Ziel */
.futoshiki-cell.hint-target {
    border-color: #ff922b !important;
    box-shadow: 0 0 12px rgba(255, 146, 43, 0.6) !important;
    animation: futoshiki-pulse 1.2s infinite;
}

/* 2. Constraint-Slots & Pfeile */
.futoshiki-constraint-h {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    color: var(--text-secondary, #adb5bd);
    transition: color 0.2s ease;
}

.futoshiki-constraint-v {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 20px;
    color: var(--text-secondary, #adb5bd);
    transition: color 0.2s ease;
}

.futoshiki-corner-slot {
    width: 20px;
    height: 20px;
}

.futoshiki-arrow-icon {
    width: 16px;
    height: 16px;
    display: block;
}

/* Verletzter Constraint (Rot) */
.futoshiki-constraint-h.violated,
.futoshiki-constraint-v.violated {
    color: #ff6b6b !important;
    filter: drop-shadow(0 0 4px rgba(255, 107, 107, 0.8));
    animation: futoshiki-shake 0.35s ease;
}

/* 3. Notizen-Minigrid */
.futoshiki-note-grid {
    display: grid;
    width: 100%;
    height: 100%;
    padding: 3px;
    box-sizing: border-box;
    pointer-events: none;
}

.futoshiki-note-grid.grid-4 { grid-template-columns: repeat(2, 1fr); grid-template-rows: repeat(2, 1fr); }
.futoshiki-note-grid.grid-5,
.futoshiki-note-grid.grid-6,
.futoshiki-note-grid.grid-7 { grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr); }

.note-digit {
    font-size: clamp(8px, 1.8vw, 11px);
    font-weight: 600;
    color: var(--text-muted, #868e96);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 4. Lösungsaufdeckung */
.cell-revealed-correct {
    border-color: #51cf66 !important;
    background: rgba(81, 207, 102, 0.15) !important;
    color: #51cf66 !important;
}

.cell-revealed-solution {
    border-color: #ffd43b !important;
    background: rgba(255, 212, 59, 0.15) !important;
}

.cell-revealed-error {
    border-color: #ff6b6b !important;
    background: rgba(255, 107, 107, 0.2) !important;
}

.wrong-val {
    color: #ff6b6b;
    text-decoration: line-through;
    font-size: 0.8em;
}

.correct-sub {
    color: #51cf66;
    font-size: 0.9em;
    font-weight: 800;
    margin-left: 2px;
}

/* 5. Keypad */
.futoshiki-keypad {
    display: flex;
    justify-content: center;
    gap: 6px;
    width: 100%;
    max-width: 440px;
    margin: 12px auto 0;
    padding: 0 4px;
    box-sizing: border-box;
}

.futoshiki-key {
    flex: 1;
    min-width: 0;
    aspect-ratio: 1.1;
    background: var(--bg-card, #2b3035);
    border: 1px solid var(--border-color, rgba(255, 255, 255, 0.12));
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.15s ease;
    padding: 4px;
    color: var(--text-primary, #f8f9fa);
}

.futoshiki-key:hover {
    border-color: var(--accent-primary, #4dabf7);
    background: rgba(77, 171, 247, 0.12);
}

.futoshiki-key:active {
    transform: scale(0.94);
}

.futoshiki-key .key-digit {
    font-size: clamp(16px, 4vw, 22px);
    font-weight: 700;
}

.futoshiki-key .key-remaining {
    font-size: 10px;
    color: var(--text-secondary, #adb5bd);
    font-weight: 600;
}

.futoshiki-key.completed-digit {
    opacity: 0.35;
}

.futoshiki-key.key-clear {
    color: #ff6b6b;
}

/* 6. Theme-Anpassungen */
.theme-amoled .futoshiki-cell {
    background: #000000;
    border-color: #222;
}

.theme-neon .futoshiki-cell.selected {
    box-shadow: 0 0 14px #00f0ff;
    border-color: #00f0ff;
}

.theme-neon .futoshiki-constraint-h,
.theme-neon .futoshiki-constraint-v {
    color: #00f0ff;
}

.theme-wood .futoshiki-cell {
    background: #dfc8a5;
    border-color: #5c3a21;
    color: #3b2314;
}

.theme-wood .futoshiki-constraint-h,
.theme-wood .futoshiki-constraint-v {
    color: #5c3a21;
}

/* 7. Keyframes */
@keyframes futoshiki-shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-4px); }
    40%, 80% { transform: translateX(4px); }
}

@keyframes futoshiki-pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}