:root {
    --bg-color: #f0f4f8;
    --text-color: #1e293b;
    --board-bg: #e2e8f0;
    --cell-bg: #f8fafc;
    --cell-border: #cbd5e1;
    --cell-revealed: #ffffff;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --secondary: #10b981;
    --secondary-hover: #059669;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --surface: #ffffff;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
}

body.dark-theme {
    --bg-color: #0f172a;
    --text-color: #f1f5f9;
    --board-bg: #1e293b;
    --cell-bg: #334155;
    --cell-border: #0f172a;
    --cell-revealed: #1e293b;
    --surface: #1e293b;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #0f172a;
        --text-color: #f1f5f9;
        --board-bg: #1e293b;
        --cell-bg: #334155;
        --cell-border: #0f172a;
        --cell-revealed: #1e293b;
        --surface: #1e293b;
        --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
    }
}

body.light-theme {
    --bg-color: #f0f4f8;
    --text-color: #1e293b;
    --board-bg: #e2e8f0;
    --cell-bg: #f8fafc;
    --cell-border: #cbd5e1;
    --cell-revealed: #ffffff;
    --surface: #ffffff;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
}

* { box-sizing: border-box; font-family: 'Outfit', sans-serif; }
body { 
    margin: 0; background-color: var(--bg-color); color: var(--text-color); 
    display: flex; justify-content: center; min-height: 100vh; 
    transition: background-color 0.3s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

.container { max-width: 600px; width: 100%; padding: 20px; display: flex; flex-direction: column; }

.app-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 24px; padding: 10px 0;
}
.app-header h1 { 
    margin: 0; font-size: 2rem; font-weight: 800; 
    display: flex; align-items: center; gap: 8px; letter-spacing: -0.5px;
}
.header-actions { display: flex; gap: 10px; }

.btn-icon { 
    background: var(--surface); border: 1px solid var(--cell-border); 
    color: var(--text-color); font-size: 1.2rem; cursor: pointer; 
    border-radius: 12px; width: 44px; height: 44px;
    display: flex; justify-content: center; align-items: center;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05); transition: all 0.2s ease;
}
.btn-icon:hover { transform: translateY(-2px); box-shadow: 0 4px 10px rgba(0,0,0,0.1); }
.btn-icon:active { transform: translateY(0); }

.menu-box { 
    background: var(--surface); border-radius: 20px; padding: 24px; 
    margin-bottom: 24px; box-shadow: var(--shadow);
    border: 1px solid rgba(255,255,255,0.05);
}
.menu-box h2 { margin-top: 0; font-size: 1.4rem; margin-bottom: 16px; font-weight: 700; }

select, input { 
    padding: 14px; margin: 10px 0 16px 0; width: 100%; 
    border: 2px solid var(--cell-border); border-radius: 12px; 
    font-size: 1rem; background-color: var(--bg-color); color: var(--text-color);
    transition: border-color 0.2s ease; outline: none; font-weight: 500;
    -webkit-user-select: auto;
    -moz-user-select: auto;
    -ms-user-select: auto;
    user-select: auto;
}
select:focus, input:focus { border-color: var(--primary); }

.btn { 
    padding: 14px 24px; border: none; border-radius: 12px; cursor: pointer; 
    font-weight: 700; font-size: 1.05rem; color: white; width: 100%; 
    margin: 8px 0; transition: all 0.2s ease; 
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1); }
.btn:active { transform: translateY(0); }
.primary { background-color: var(--primary); }
.primary:hover { background-color: var(--primary-hover); }
.secondary { background-color: var(--secondary); }
.secondary:hover { background-color: var(--secondary-hover); }
.danger { background-color: var(--danger); }
.danger:hover { background-color: var(--danger-hover); }

#status-bar { 
    background-color: var(--surface); padding: 12px 16px; border-radius: 12px; 
    margin-bottom: 20px; font-weight: 600; font-size: 0.95rem; text-align: center;
    box-shadow: var(--shadow);
}
.highlight { color: var(--primary); font-weight: 800; letter-spacing: 1px; }

.game-info { 
    display: flex; justify-content: space-around; margin-bottom: 20px; 
    background: var(--surface); padding: 12px; border-radius: 16px;
    box-shadow: var(--shadow); font-weight: 700; font-size: 1.1rem;
}
.stat-box { display: flex; align-items: center; gap: 8px; }

.board-container { 
    width: 100%; overflow-x: auto; 
    padding: 10px; text-align: center;
}
.board { 
    display: inline-grid; gap: 2px; 
    background-color: var(--board-bg); padding: 6px; 
    border-radius: 12px; box-shadow: var(--shadow);
    margin: 0 auto; text-align: left;
}
.cell { 
    width: var(--cell-size, 32px); height: var(--cell-size, 32px); 
    background-color: var(--cell-bg); 
    display: flex; justify-content: center; align-items: center; 
    cursor: pointer; font-weight: 800; font-size: 16px; border-radius: 4px;
    -webkit-user-select: none; -moz-user-select: none; -ms-user-select: none; user-select: none;
    -webkit-user-drag: none;
    transition: all 0.15s ease;
    box-shadow: inset 1px 1px 0 rgba(255,255,255,0.15), inset -2px -2px 0 rgba(0,0,0,0.25);
}
.cell:active { transform: scale(0.95); box-shadow: inset 1px 1px 3px rgba(0,0,0,0.3); }
.cell.revealed { background-color: var(--cell-revealed); box-shadow: inset 1px 1px 4px rgba(0,0,0,0.2); cursor: default; transform: none; }
.cell.long-pressed { opacity: 0.7; transform: scale(0.9); }

.c1 { color: #3b82f6; }
.c2 { color: #10b981; }
.c3 { color: #ef4444; }
.c4 { color: #8b5cf6; }
.c5 { color: #f59e0b; }
.c6 { color: #06b6d4; }
.c7 { color: #111827; }
.c8 { color: #64748b; }

.msg-win { color: var(--secondary); font-weight: 800; font-size: 1.5rem; text-align: center; margin: 20px 0; }
.msg-lose { color: var(--danger); font-weight: 800; font-size: 1.5rem; text-align: center; margin: 20px 0; }
.hidden { display: none !important; }
.controls { display: flex; gap: 10px; margin-top: 20px; }

/* Toggle Switch */
.toggle-switch {
    position: relative; display: inline-block; width: 50px; height: 26px;
}
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.slider {
    position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--cell-border); transition: .3s; border-radius: 26px;
}
.slider:before {
    position: absolute; content: ""; height: 18px; width: 18px; left: 4px; bottom: 4px;
    background-color: white; transition: .3s; border-radius: 50%;
}
input:checked + .slider { background-color: var(--primary); }
input:checked + .slider:before { transform: translateX(24px); }
input:focus + .slider { box-shadow: 0 0 1px var(--primary); }

.app-footer { margin-top: auto; padding-top: 40px; font-size: 0.85rem; opacity: 0.6; text-align: center; font-weight: 500; }

/* Accessibility Cursor */
.a11y-cursor {
    outline: 3px solid var(--primary);
    outline-offset: -3px;
    position: relative;
    z-index: 5;
    box-shadow: 0 0 8px var(--primary);
}

/* Animations */
@keyframes popIn {
    0% { transform: scale(0.5); opacity: 0; }
    70% { transform: scale(1.15); }
    100% { transform: scale(1); opacity: 1; }
}
@keyframes flagPlant {
    0% { transform: translateY(-10px) scale(1.5) rotate(15deg); opacity: 0; }
    100% { transform: translateY(0) scale(1) rotate(0); opacity: 1; }
}
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-4px) rotate(-5deg); }
    40% { transform: translateX(4px) rotate(5deg); }
    60% { transform: translateX(-4px) rotate(-5deg); }
    80% { transform: translateX(4px) rotate(5deg); }
}

.anim-reveal { animation: popIn 0.35s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards; }
.anim-flag { animation: flagPlant 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards; }
.anim-explode { animation: shake 0.5s ease-in-out; background-color: var(--danger) !important; color: white !important; box-shadow: 0 0 15px var(--danger) !important; z-index: 10; position: relative; }

@media (max-width: 480px) {
    .container { padding: 8px; }
    .app-header h1 { font-size: 1.4rem; }
    .board { padding: 4px; gap: 1px; }
    .cell { font-size: 14px; }
}