/* =========================================================
   LOCK & KEY MEMORY GAME STYLES
   ========================================================= */

.game-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 680px;
    margin: 0 auto;
    animation: fadeInUp 0.6s ease-out;
}

.game-header-section {
    text-align: left;
    width: 100%;
    margin-bottom: 1.5rem;
}

.game-header-section h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 0.35rem;
    color: #ffffff;
    background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.game-header-section .subtitle {
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 400;
}

/* Level Selection Buttons */
.level-selector-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    width: 100%;
    margin-bottom: 1.5rem;
}

.lvl-btn {
    background: #0070f3;
    color: #ffffff;
    border: none;
    border-radius: 8px;
    padding: 0.6rem 1.1rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px rgba(0, 112, 243, 0.25);
    flex: 1 1 auto;
    text-align: center;
}

.lvl-btn:hover {
    background: #005bb5;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 112, 243, 0.35);
}

.lvl-btn.active {
    background: #0250a3;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3), 0 0 0 2px #60a5fa;
}

/* Objective Heading Bar */
.objective-heading-bar {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.objective-heading-bar h2 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text-main);
}

.highlight-objective {
    color: #38bdf8;
    transition: color 0.3s ease;
}

.highlight-objective.door-phase {
    color: #4ade80;
}

.stats-pill {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 0.35rem 0.85rem;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.stats-pill strong {
    color: var(--text-main);
}

/* Board Outer Card */
.board-outer-card {
    background: #cbd5e1;
    border-radius: 12px;
    padding: 1.25rem;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
    width: 100%;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 1.5rem;
    min-height: 280px;
}

.board-grid-wrapper {
    position: relative;
    display: inline-block;
}

/* Game Grid Layouts */
.game-grid {
    display: grid;
    gap: 8px;
    background: transparent;
    user-select: none;
    position: relative;
    z-index: 2;
}

.game-grid.grid-3x3 {
    grid-template-columns: repeat(3, 72px);
    grid-template-rows: repeat(3, 72px);
}

.game-grid.grid-4x4 {
    grid-template-columns: repeat(4, 62px);
    grid-template-rows: repeat(4, 62px);
}

.game-grid.grid-5x5 {
    grid-template-columns: repeat(5, 52px);
    grid-template-rows: repeat(5, 52px);
}

/* Grid Tile Styling */
.grid-cell {
    background: #ffffff;
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2rem;
    cursor: pointer;
    position: relative;
    transition: transform 0.15s ease, background 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.grid-cell:hover:not(.player-cell) {
    transform: scale(1.04);
    background: #f1f5f9;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

.grid-cell.player-cell {
    background: #334155 !important;
    box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.4);
}

.grid-cell.start-marker:not(.player-cell) {
    background: #e2e8f0;
}

/* Directional blocked edge indicator (when bumped) */
.grid-cell.locked-bump {
    animation: shakeBounce 0.5s cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
    background: #fee2e2 !important;
    border: 2px solid #ef4444;
}

/* Solution Path Marker */
.grid-cell.path-highlight {
    background: #dcfce7 !important;
    border: 2px dashed #22c55e;
}

.grid-cell.path-highlight::after {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #16a34a;
    bottom: 4px;
    right: 4px;
}

/* Invisible Barriers & Visual Feedback */
.barriers-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 10;
}

.barrier-line {
    position: absolute;
    background: #ef4444;
    border-radius: 4px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, box-shadow 0.25s ease, transform 0.2s ease;
}

/* Shown when solution path is active (matching reference diagram) */
.barrier-line.visible {
    opacity: 1;
    background: #ef4444;
    box-shadow: 0 0 10px rgba(239, 68, 68, 0.85), 0 0 2px #b91c1c;
}

/* Flashes bright red when player bumps into invisible barrier */
.barrier-line.bump-flash {
    opacity: 1 !important;
    background: #ff1e1e !important;
    box-shadow: 0 0 18px rgba(255, 30, 30, 0.95), 0 0 4px #ffffff !important;
    animation: barrierFlash 0.75s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

@keyframes barrierFlash {
    0% {
        opacity: 0;
        transform: scale(0.9);
    }
    30% {
        opacity: 1;
        transform: scale(1.15);
    }
    70% {
        opacity: 1;
        transform: scale(1.05);
    }
    100% {
        opacity: 0;
        transform: scale(1);
    }
}

/* Icon scaling */
.cell-icon {
    display: inline-block;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
    line-height: 1;
}

.cell-icon.player-icon {
    font-size: 2rem;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.3));
}

.cell-icon.key-icon {
    font-size: 1.85rem;
    filter: drop-shadow(0 2px 3px rgba(0,0,0,0.15));
}

.cell-icon.door-icon {
    font-size: 1.85rem;
    filter: drop-shadow(0 2px 3px rgba(0,0,0,0.15));
}

.grid-4x4 .grid-cell {
    font-size: 1.65rem;
}
.grid-4x4 .cell-icon.player-icon {
    font-size: 1.7rem;
}
.grid-4x4 .cell-icon.key-icon,
.grid-4x4 .cell-icon.door-icon {
    font-size: 1.5rem;
}

.grid-5x5 .grid-cell {
    font-size: 1.4rem;
}
.grid-5x5 .cell-icon.player-icon {
    font-size: 1.45rem;
}
.grid-5x5 .cell-icon.key-icon,
.grid-5x5 .cell-icon.door-icon {
    font-size: 1.3rem;
}

/* Actions Row Buttons */
.actions-row {
    display: flex;
    gap: 0.75rem;
    width: 100%;
    margin-bottom: 1.75rem;
}

.btn-action {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    flex: 1;
}

.btn-reset {
    background: #0070f3;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(0, 112, 243, 0.25);
}

.btn-reset:hover {
    background: #005bb5;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 112, 243, 0.35);
}

.btn-randomize {
    background: linear-gradient(135deg, #8b5cf6 0%, #6d28d9 100%);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

.btn-randomize:hover {
    background: linear-gradient(135deg, #7c3aed 0%, #5b21b6 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(139, 92, 246, 0.45);
}

.btn-solution {
    background: #22c55e;
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(34, 197, 94, 0.25);
}

.btn-solution:hover {
    background: #16a34a;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(34, 197, 94, 0.35);
}

/* Virtual D-Pad for Mobile / Accessibility */
.dpad-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    margin-bottom: 2rem;
}

.dpad-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.dpad-btn {
    width: 50px;
    height: 48px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    border-radius: 10px;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.15s ease;
    backdrop-filter: blur(8px);
}

.dpad-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: var(--primary);
    transform: scale(1.05);
}

.dpad-btn:active {
    transform: scale(0.95);
    background: var(--primary);
}

.dpad-center {
    width: 50px;
    height: 48px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    opacity: 0.5;
}

/* Rules Card */
.rules-card {
    background: #ffffff;
    color: #1e293b;
    border-radius: 12px;
    padding: 1.5rem 2rem;
    width: 100%;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
    text-align: left;
}

.rules-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #0f172a;
}

.rules-card ul {
    list-style-type: none;
    padding-left: 0;
}

.rules-card li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.65rem;
    font-size: 0.95rem;
    line-height: 1.5;
    color: #334155;
}

.rules-card li::before {
    content: "•";
    position: absolute;
    left: 0.25rem;
    font-size: 1.3rem;
    color: #475569;
    line-height: 1;
}

.rules-card .rule-icon {
    font-size: 1.1rem;
    vertical-align: middle;
}

/* Animations */
@keyframes shakeBounce {
    0%, 100% { transform: translateX(0); }
    15%, 45%, 75% { transform: translateX(-6px); }
    30%, 60%, 90% { transform: translateX(6px); }
}

@keyframes popWin {
    0% { transform: scale(1); }
    50% { transform: scale(1.12); box-shadow: 0 0 25px rgba(34, 197, 94, 0.8); }
    100% { transform: scale(1); }
}

.level-win-anim {
    animation: popWin 0.6s ease-in-out;
}

/* Responsive adjustments */
@media (max-width: 640px) {
    .board-outer-card {
        justify-content: center;
        padding: 1rem;
    }
    
    .game-grid.grid-3x3 {
        grid-template-columns: repeat(3, 64px);
        grid-template-rows: repeat(3, 64px);
    }
    
    .game-grid.grid-4x4 {
        grid-template-columns: repeat(4, 54px);
        grid-template-rows: repeat(4, 54px);
    }
    
    .game-grid.grid-5x5 {
        grid-template-columns: repeat(5, 46px);
        grid-template-rows: repeat(5, 46px);
    }
    
    .lvl-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }
    
    /* Stack the 3 buttons in a 2-column grid on mobile */
    .actions-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.6rem;
    }

    /* Solution button spans full width on mobile */
    .btn-solution {
        grid-column: 1 / -1;
    }
}