:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.5;font-weight:400;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}:root,:root[data-theme=light],.theme-light{--bg-primary: #f8fafc;--bg-secondary: #e2e8f0;--bg-tertiary: #cbd5e1;--text-primary: #1e293b;--text-secondary: #475569;--text-muted: #64748b;--cell-hidden: #e2e8f0;--cell-revealed: #f1f5f9;--cell-hover: #cbd5e1;--mine-color: #dc2626;--flag-color: #ea580c;--border-light: #cbd5e1;--border-dark: #94a3b8;--primary: #3b82f6;--primary-hover: #2563eb;--success: #10b981;--danger: #ef4444;--warning: #f59e0b;color:var(--text-primary);background-color:var(--bg-primary)}:root[data-theme=dark],.theme-dark{--bg-primary: #0f172a;--bg-secondary: #1e293b;--bg-tertiary: #334155;--text-primary: #f1f5f9;--text-secondary: #cbd5e1;--text-muted: #94a3b8;--cell-hidden: #334155;--cell-revealed: #1e293b;--cell-hover: #475569;--mine-color: #f87171;--flag-color: #fb923c;--border-light: #475569;--border-dark: #64748b;--primary: #60a5fa;--primary-hover: #3b82f6;--success: #34d399;--danger: #f87171;--warning: #fbbf24;color:var(--text-primary);background-color:var(--bg-primary)}*{box-sizing:border-box}html{height:100%}body{margin:0;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;min-width:320px;background:linear-gradient(135deg,var(--bg-primary) 0%,var(--bg-secondary) 100%)}h1{font-size:2.5rem;line-height:1.1;margin:1rem 0;background:linear-gradient(135deg,var(--primary),var(--primary-hover));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-align:center}h2{font-size:1.5rem;color:var(--text-primary)}h3{font-size:1.25rem;color:var(--text-secondary);margin:1rem 0 .5rem}button{border-radius:8px;border:1px solid var(--border-light);padding:.75em 1.5em;font-size:.875rem;font-weight:600;font-family:inherit;background:#fff;color:var(--text-primary);cursor:pointer;transition:all .2s ease;box-shadow:0 1px 2px #0000000d}button:hover{background:var(--bg-secondary);border-color:var(--border-dark);transform:translateY(-1px);box-shadow:0 4px 8px #0000001a}button:active{transform:translateY(0);box-shadow:0 1px 2px #0000000d}button:focus,button:focus-visible{outline:2px solid var(--primary);outline-offset:2px}.cell{width:32px;height:32px;border:2px solid var(--border-light);background:var(--cell-hidden);display:inline-flex;align-items:center;justify-content:center;font-weight:700;font-size:14px;cursor:pointer;-webkit-user-select:none;user-select:none;transition:all .15s ease;border-radius:0;box-shadow:inset 0 0 0 1px #ffffff1a;position:relative}.cell:hover:not(.revealed):not([disabled]){background:var(--cell-hover);transform:translateY(-1px);box-shadow:0 2px 4px #0000001a;border-color:var(--border-dark)}.cell:active:not(.revealed):not([disabled]){transform:translateY(0);box-shadow:0 1px 2px #0000000d}.cell.hidden{background:var(--cell-hidden)}.cell.revealed{background:var(--cell-revealed);border-color:var(--border-dark);box-shadow:inset 2px 2px 4px #0003;cursor:default}.cell.flagged{background:linear-gradient(135deg,var(--cell-hidden) 0%,#fef3c7 100%);border-color:var(--flag-color)}.cell.mine{background:linear-gradient(135deg,var(--mine-color) 0%,#dc2626 100%);color:#fff;box-shadow:0 2px 4px 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0}}.game-controls{margin-bottom:1.5rem}.game-header{display:flex;justify-content:space-between;align-items:center;background:var(--bg-primary);border:1px solid var(--border-light);border-radius:12px;padding:1rem 1.5rem;margin-bottom:1rem;max-width:400px;margin-left:auto;margin-right:auto;box-shadow:0 2px 8px #00000026}.counter{display:flex;flex-direction:column;align-items:center;min-width:70px}.counter-label{font-size:.75rem;font-weight:600;margin-bottom:4px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px}.counter-value{background:linear-gradient(135deg,#1f2937,#111827);color:#ef4444;font-family:SF Mono,Monaco,Inconsolata,Roboto Mono,monospace;font-weight:700;font-size:1.125rem;padding:6px 12px;border:1px solid #374151;border-radius:6px;min-width:50px;text-align:center;box-shadow:inset 0 1px 2px #0003}.new-game-btn{width:56px;height:56px;font-size:28px;line-height:1;border:1px solid var(--border-light);background:linear-gradient(135deg,#f8fafc,#e2e8f0);cursor:pointer;border-radius:12px;transition:all .2s ease;box-shadow:0 2px 4px #0000001a;display:flex;align-items:center;justify-content:center;padding:0}.new-game-btn:hover{transform:translateY(-1px);box-shadow:0 4px 8px #00000026;background:linear-gradient(135deg,#e2e8f0,#cbd5e1)}.new-game-btn:active{transform:translateY(0);box-shadow:0 1px 2px #0000001a}.difficulty-controls{display:flex;align-items:center;justify-content:center;gap:12px;margin-bottom:1rem;flex-wrap:wrap}.difficulty-controls label{font-weight:600;color:var(--text-secondary);font-size:.875rem}.difficulty-select{padding:8px 16px;border:1px solid var(--border-light);background:var(--bg-primary);color:var(--text-primary);font-size:.875rem;font-weight:500;border-radius:8px;cursor:pointer;transition:all .2s ease;box-shadow:0 1px 2px #0000000d}.difficulty-select:focus{outline:2px solid var(--primary);outline-offset:2px;border-color:var(--primary)}.difficulty-select:hover{border-color:var(--border-dark);box-shadow:0 2px 4px #0000001a}.game-message{padding:1rem 1.5rem;margin:1rem 0;border-radius:12px;font-weight:600;font-size:1rem;text-align:center;border:1px solid;box-shadow:0 2px 8px #0000001a}.win-message{background:linear-gradient(135deg,#d1fae5,#a7f3d0);color:#047857;border-color:#6ee7b7}.lose-message{background:linear-gradient(135deg,#fee2e2,#fecaca);color:#b91c1c;border-color:#f87171}@media(max-width:768px){.game-header{padding:.75rem 1rem;max-width:100%}.counter{min-width:60px}.counter-value{font-size:1rem;padding:4px 8px}.new-game-btn{width:48px;height:48px;font-size:24px;line-height:1}.difficulty-controls{gap:8px}.difficulty-select{padding:6px 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#0003}input:checked+.toggle-slider{background:var(--primary)}input:checked+.toggle-slider:before{transform:translate(20px)}.theme-select{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:6px;padding:6px 12px;font-size:.875rem;color:var(--text-primary);cursor:pointer;transition:all .2s ease;min-width:120px}.theme-select:hover{border-color:var(--border-dark)}.theme-select:focus{outline:2px solid var(--primary);outline-offset:2px;border-color:var(--primary)}.keyboard-shortcuts{display:flex;flex-direction:column;gap:8px}.shortcut-item{display:flex;align-items:center;gap:12px;padding:8px 0}.shortcut-key{background:var(--bg-secondary);border:1px solid var(--border-light);border-radius:4px;padding:4px 8px;font-family:SF Mono,Monaco,monospace;font-size:.75rem;color:var(--text-secondary);min-width:80px;text-align:center}.shortcut-action{color:var(--text-secondary);font-size:.875rem}.about-info{color:var(--text-muted);line-height:1.6}.about-info p{margin:8px 0}.about-info strong{color:var(--text-primary)}@media(max-width:480px){.settings-content{width:95vw}.settings-header{padding:12px 16px}.settings-body{padding:16px}.setting-item{flex-direction:column;align-items:flex-start;gap:8px}.setting-control{align-self:flex-end}}.loading-container{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:2rem;gap:1rem}.loading-spinner{display:inline-block;position:relative;width:40px;height:40px}.spinner-ring{box-sizing:border-box;display:block;position:absolute;width:32px;height:32px;margin:4px;border:3px solid var(--primary);border-radius:50%;animation:spin 1.2s cubic-bezier(.5,0,.5,1) infinite;border-color:var(--primary) transparent transparent transparent}.spinner-ring:nth-child(1){animation-delay:-.45s}.spinner-ring:nth-child(2){animation-delay:-.3s}.spinner-ring:nth-child(3){animation-delay:-.15s}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.loading-message{color:var(--text-secondary);font-size:.875rem;margin:0;text-align:center}.app{width:100%;max-width:1200px;margin:0 auto;padding:1rem;text-align:center;min-height:100vh;display:flex;flex-direction:column;gap:1.5rem}.app-header{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1rem;margin-bottom:1rem}.app-title{flex:1;text-align:center}.header-actions{display:flex;gap:.5rem}.stats-btn{background:var(--primary);color:#fff;border:1px solid var(--primary-hover);padding:.5rem 1rem;font-size:.875rem;font-weight:600;border-radius:6px;cursor:pointer;transition:all .2s ease}.stats-btn:hover{background:var(--primary-hover);transform:translateY(-1px);box-shadow:0 4px 12px #3b82f64d}.game-container{background:var(--bg-primary);border-radius:16px;padding:2rem;box-shadow:0 4px 20px #00000026;border:1px solid var(--border-light)}.instructions{margin-top:2rem;text-align:left;background:linear-gradient(135deg,#f8fafc,#e2e8f0);padding:1.5rem;border-radius:12px;border:1px solid var(--border-light);box-shadow:0 2px 8px #0000000d}.instructions p{margin:0 0 1rem;font-weight:600;color:var(--text-primary);font-size:1rem}.instructions ul{margin:0;padding-left:1.5rem;color:var(--text-secondary)}.instructions li{margin:.5rem 0;line-height:1.6}@media(max-width:768px){.app{padding:.5rem}.app-header{flex-direction:column;text-align:center}.header-actions{justify-content:center}.game-container{padding:1rem;border-radius:12px}.instructions{margin-top:1rem;padding:1rem}}