@import"https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800&display=swap";:root{--bg-primary: #121213;--bg-secondary: #272729;--text-primary: #ffffff;--text-secondary: #818384;--border-color: #3a3a3c;--tile-bg: #121213;--tile-border: #3a3a3c;--tile-text: #ffffff;--tile-hover-border: #565758;--color-add: #538d4e;--color-sub: #b59f3b;--color-mul: #b8621b;--color-div: #4facda;--accent: #6aaa64;--accent-secondary: #4facda;--shadow-sm: 0 2px 5px rgba(0, 0, 0, .2);--shadow-md: 0 4px 12px rgba(0, 0, 0, .3);--tile-size: min(15vw, 68px);--tile-radius: 8px;--tile-gap: 8px}[data-theme=light]{--bg-primary: #ffffff;--bg-secondary: #f3f3f3;--text-primary: #1a1a1b;--text-secondary: #787c7e;--border-color: #d3d6da;--tile-bg: #ffffff;--tile-border: #d3d6da;--tile-text: #1a1a1b;--tile-hover-border: #878a8c;--color-add: #6aaa64;--color-sub: #c9b458;--color-mul: #d17524;--color-div: #5cb9e8;--accent: #6aaa64;--accent-secondary: #5cb9e8;--shadow-sm: 0 2px 5px rgba(0, 0, 0, .05);--shadow-md: 0 4px 12px rgba(0, 0, 0, .1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;width:100%;overflow-x:hidden;background:var(--bg-primary);color:var(--text-primary);font-family:Outfit,sans-serif;transition:background-color .2s,color .2s;-webkit-font-smoothing:antialiased}.app-container{display:flex;flex-direction:column;min-height:100vh;margin:0 auto;max-width:600px;padding:0 16px}.top-header{display:flex;align-items:center;justify-content:space-between;padding:16px 0;border-bottom:1px solid var(--border-color);margin-bottom:24px}.header-left{display:flex;align-items:center;gap:4px;flex:1;justify-content:flex-start}.header-icon-btn{background:transparent;border:none;color:var(--text-secondary);font-size:1.4rem;cursor:pointer;width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:var(--tile-radius);transition:all .2s}.header-icon-btn:hover{background:var(--bg-secondary);color:var(--text-primary)}.app-title{font-size:2rem;font-weight:800;letter-spacing:-.02em;flex:1;text-align:center}.header-right{display:flex;gap:4px;flex:1;justify-content:flex-end}.mode-nav{display:flex;justify-content:center;gap:4px;margin-bottom:40px;position:relative}.nav-btn{background:var(--bg-primary);border:1px solid var(--border-color);color:var(--text-primary);padding:10px 16px;border-radius:var(--tile-radius);font-family:Outfit,sans-serif;font-weight:600;font-size:.9rem;cursor:pointer;transition:color .2s,background .2s,border-color .2s}.nav-btn.active.daily{background:#538d4e40;color:var(--color-add);border-color:var(--color-add)}.nav-btn.active.timeRush{background:#b8621b40;color:var(--color-mul);border-color:var(--color-mul)}.nav-btn.active.zen{background:#b59f3b40;color:var(--color-sub);border-color:var(--color-sub)}.nav-btn.active.archive{background:#4facda40;color:var(--color-div);border-color:var(--color-div)}.nav-pill{position:absolute;bottom:-4px;left:0;right:0;height:3px;border-radius:2px;background:var(--accent)}.nav-pill.daily{background:var(--color-add)}.nav-pill.timeRush{background:var(--color-mul)}.nav-pill.zen{background:var(--color-sub)}.nav-pill.archive{background:var(--color-div)}.nav-btn:hover:not(.active){background:var(--bg-secondary)}.game-area{display:flex;flex-direction:column;align-items:center;flex:1}.archive-date-bar{width:100%;padding:0 12px 8px;display:flex;flex-direction:column;align-items:center;gap:2px}.archive-mode-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-secondary);font-weight:600}.archive-date{font-size:.95rem;font-weight:600;color:var(--text-primary)}.info-bar{display:flex;justify-content:space-between;align-items:center;width:100%;margin-bottom:24px;padding:0 12px}.info-stat{display:flex;flex-direction:column;align-items:center}.info-val{font-size:1.4rem;font-weight:700}.info-lbl{font-size:.75rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;font-weight:600}.info-controls{display:flex;gap:8px}.round-btn{width:40px;height:40px;border-radius:50%;background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-primary);display:flex;align-items:center;justify-content:center;font-size:1.1rem;cursor:pointer;transition:all .2s}.round-btn:hover:not(:disabled){border-color:var(--text-secondary)}.round-btn:disabled{opacity:.3;cursor:not-allowed}.board-container{width:100%;display:flex;justify-content:center;margin-bottom:40px}.tile-row{display:flex;flex-wrap:nowrap;gap:var(--tile-gap);justify-content:center;align-items:center;position:relative;width:100%}.tile{width:var(--tile-size);height:var(--tile-size);background:var(--tile-bg);border:2px solid var(--tile-border);border-radius:var(--tile-radius);color:var(--tile-text);font-size:clamp(1.8rem,6vw,2.4rem);font-weight:800;display:flex;align-items:center;justify-content:center;cursor:pointer;-webkit-user-select:none;user-select:none;touch-action:none;position:relative;z-index:1;transition:border-color .2s,background-color .2s}.tile:hover{border-color:var(--tile-hover-border)}.tile.selected{border-color:var(--text-primary);background:var(--bg-secondary);transform:scale(1.05);box-shadow:var(--shadow-sm);z-index:10}.tile.selected.selected-op-add{border-color:var(--color-add)}.tile.selected.selected-op-sub{border-color:var(--color-sub)}.tile.selected.selected-op-mul{border-color:var(--color-mul)}.tile.selected.selected-op-div{border-color:var(--color-div)}.tile.solved{opacity:.75;filter:saturate(.85);cursor:default;pointer-events:none}.tile.solved:hover{border-color:var(--tile-border)}.tile.swap-target{border:2px dashed var(--text-primary);background:var(--bg-secondary);transform:scale(1.05)}.operator-bar{display:flex;gap:12px;justify-content:center;margin-bottom:24px}.op-btn{width:clamp(50px,12vw,60px);height:clamp(50px,12vw,60px);border-radius:var(--tile-radius);background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-primary);font-size:1.6rem;font-family:inherit;font-weight:600;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center}.op-btn:disabled{opacity:.2;cursor:not-allowed}.op-btn:hover:not(:disabled){border-color:var(--text-secondary)}.op-btn.active.add{background:var(--color-add);border-color:var(--color-add);color:#fff;transform:scale(1.08);box-shadow:var(--shadow-sm)}.op-btn.active.sub{background:var(--color-sub);border-color:var(--color-sub);color:#fff;transform:scale(1.08);box-shadow:var(--shadow-sm)}.op-btn.active.mul{background:var(--color-mul);border-color:var(--color-mul);color:#fff;transform:scale(1.08);box-shadow:var(--shadow-sm)}.op-btn.active.div{background:var(--color-div);border-color:var(--color-div);color:#fff;transform:scale(1.08);box-shadow:var(--shadow-sm)}.op-btn-wrap{display:inline-flex;flex-direction:column;align-items:center;gap:2px}.op-btn.disallowed{opacity:.4}.op-disallowed-label{font-size:.65rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.02em}.disallowed-operator-hint{text-align:center;font-size:.8rem;color:var(--text-secondary);margin:0 0 8px}.hint-text{text-align:center;font-size:.9rem;color:var(--text-secondary);margin-top:12px}.confetti-burst{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);pointer-events:none;z-index:1000}.confetti-particle{position:absolute;top:0;left:0;width:var(--particle-size, 8px);height:var(--particle-size, 8px);background:var(--particle-color, var(--accent));border-radius:2px;transform-origin:center center}.message-card{text-align:center;padding:40px 20px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--tile-radius);width:100%;max-width:400px;margin-top:20px}.message-card h2{font-size:1.8rem;margin-bottom:8px}.message-card p{color:var(--text-secondary);margin-bottom:24px}.primary-btn{background:var(--accent);color:#fff;border:none;padding:14px 24px;border-radius:var(--tile-radius);font-size:1rem;font-weight:600;font-family:inherit;cursor:pointer;width:100%;transition:opacity .2s}.message-card .primary-btn:not(.secondary-style){background:var(--text-primary);color:var(--bg-primary)}.primary-btn:hover{opacity:.9}.primary-btn.secondary-style{background:transparent;color:var(--text-primary);border:2px solid var(--border-color)}.primary-btn.secondary-style:hover{background:var(--bg-secondary)}.win-screen-actions{display:flex;flex-direction:column;align-items:center;margin-top:16px}.share-btn{background:var(--accent);color:#fff;border:none;padding:14px 24px;border-radius:var(--tile-radius);font-size:1rem;font-weight:600;font-family:inherit;cursor:pointer;width:100%;transition:opacity .2s;margin-top:12px}.share-btn:hover{opacity:.9}.share-block{background:var(--bg-primary);padding:16px;border-radius:var(--tile-radius);font-family:monospace;font-size:.9rem;white-space:pre-wrap;color:var(--text-secondary);margin:16px 0;border:1px solid var(--border-color)}.modal-overlay{position:fixed;inset:0;background:#0009;z-index:100;display:flex;align-items:center;justify-content:center;padding:20px;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}.modal-content{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--tile-radius);width:100%;max-width:440px;max-height:90vh;overflow-y:auto;box-shadow:var(--shadow-md);color:var(--text-primary)}.modal-header{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;border-bottom:1px solid var(--border-color)}.modal-header h2{font-size:1.25rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em}.close-btn{background:transparent;border:none;color:var(--text-secondary);font-size:2rem;cursor:pointer;line-height:1}.close-btn:hover{color:var(--text-primary)}.modal-body{padding:24px}.rule-group{margin-bottom:24px}.rule-group h3{font-size:1.1rem;margin-bottom:8px;color:var(--text-primary)}.rule-group p{color:var(--text-secondary);font-size:.95rem;line-height:1.5;margin-bottom:6px}.stats-content{width:100%;max-width:520px;display:flex;flex-direction:column;max-height:min(85vh,640px)}.stats-content .modal-body{flex:1;min-height:0;height:480px;overflow-y:auto;overflow-x:hidden}.stats-modal-tabs{display:flex;gap:4px;padding:0 24px 12px;border-bottom:1px solid var(--border-color)}.stats-tab-wrap{position:relative}.stats-tab-pill{position:absolute;bottom:-13px;left:0;right:0;height:3px;border-radius:2px;background:var(--accent)}.stats-tab{display:flex;align-items:center;gap:6px;padding:10px 16px;border:none;background:transparent;color:var(--text-secondary);font-size:.95rem;font-weight:500;cursor:pointer;border-radius:8px}.stats-tab:hover,.stats-tab.active{color:var(--text-primary);background:var(--bg-secondary)}.stat-section{margin-bottom:24px}.stat-section h3{font-size:1.1rem;margin-bottom:16px;text-transform:uppercase;letter-spacing:.05em}.stat-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:20px;text-align:center}.stat-grid.double{grid-template-columns:repeat(2,1fr)}.stat-box{display:flex;flex-direction:column}.stat-val{font-size:1.8rem;font-weight:700}.stat-lbl{font-size:.75rem;color:var(--text-secondary);text-transform:uppercase}.dist-title{font-size:.85rem;text-transform:uppercase;color:var(--text-primary);margin-bottom:12px}.dist-chart{display:flex;flex-direction:column;gap:6px}.dist-row{display:flex;align-items:center;gap:8px;height:24px}.dist-label{width:28px;font-size:.85rem;text-align:right;color:var(--text-secondary)}.dist-bar-track{flex:1;background:transparent;height:100%;display:flex;align-items:center}.dist-bar{height:100%;background:var(--text-secondary);min-width:24px;display:flex;align-items:center;justify-content:flex-end;padding-right:6px;color:#fff;font-size:.8rem;font-weight:600;border-radius:2px}.dist-bar[style*="width: 0%"]{background:transparent;min-width:0}.divider{height:1px;background:var(--border-color);margin:24px 0}.tutorial-banner{margin-bottom:24px;padding:16px;background:var(--bg-secondary);border-radius:var(--tile-radius);border:1px solid var(--text-primary);text-align:center}.tutorial-banner h3{font-size:1.1rem;margin-bottom:8px}.tutorial-banner p{font-size:.9rem;color:var(--text-secondary);margin-bottom:16px}.tutorial-banner p em{color:var(--text-primary);font-style:normal;font-weight:600}.tutorial-next-btn{background:var(--text-primary);color:var(--bg-primary);border:none;padding:8px 16px;border-radius:4px;font-weight:600;cursor:pointer}.paywall-overlay{padding:24px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:16px}.paywall-overlay h3{font-size:1.2rem;margin:0}.paywall-overlay .lock-icon{color:var(--text-secondary);flex-shrink:0}.paywall-overlay p{color:var(--text-secondary);font-size:.95rem;margin:0}.unlock-btn{background:var(--color-add);color:#fff;border:none;padding:12px 24px;border-radius:8px;font-weight:600;font-size:1rem;cursor:pointer;margin-top:8px}.unlock-btn:hover:not(:disabled){filter:brightness(1.1)}.unlock-btn:disabled{opacity:.7;cursor:not-allowed}.archive-body{padding:24px}.calendar-nav{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px;padding:0 4px}.calendar-nav h3{font-size:1.1rem;font-weight:600;margin:0}.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;text-align:center}.day-header{font-size:.7rem;font-weight:600;text-transform:uppercase;color:var(--text-secondary);padding:4px 0}.day-btn{aspect-ratio:1;min-width:36px;border:1px solid var(--border-color);border-radius:6px;background:var(--bg-secondary);color:var(--text-primary);font-size:.9rem;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s,border-color .2s}.day-btn:hover:not(:disabled){border-color:var(--text-secondary);background:var(--tile-hover-border)}.day-btn:disabled{opacity:.4;cursor:not-allowed}.day-btn.today{border-color:var(--color-add);background:#538d4e33}.day-btn.solved{background:var(--color-add);color:#fff;border-color:var(--color-add)}.day-btn.solved:hover:not(:disabled){filter:brightness(1.15)}.icon-btn{background:transparent;border:none;color:var(--text-secondary);padding:8px;cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:6px}.icon-btn:hover:not(:disabled){color:var(--text-primary);background:var(--bg-secondary)}.icon-btn:disabled{opacity:.5;cursor:not-allowed}.settings-modal{max-width:520px}.settings-tabs{display:flex;gap:4px;padding:0 24px 12px;border-bottom:1px solid var(--border-color)}.settings-tab{display:flex;align-items:center;gap:6px;padding:10px 16px;border:none;background:transparent;color:var(--text-secondary);font-size:.95rem;font-weight:500;cursor:pointer;border-radius:8px}.settings-tab:hover,.settings-tab.active{color:var(--text-primary);background:var(--bg-secondary)}.settings-body{max-height:70vh;overflow-y:auto}.settings-section{margin-bottom:24px}.setting-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 0;border-bottom:1px solid var(--border-color)}.setting-row:last-child{border-bottom:none}.setting-row label{font-size:.95rem;color:var(--text-primary)}.settings-input{padding:8px 12px;border:1px solid var(--border-color);border-radius:6px;background:var(--bg-secondary);color:var(--text-primary);font-size:.9rem;width:180px}.identity-row{flex-wrap:wrap}.identity-row .settings-input{width:100%;max-width:220px}.setting-row-block{flex-direction:column;align-items:stretch;gap:8px}.setting-row-block label{margin:0}.setting-input-wrap{display:flex;gap:8px;align-items:center}.setting-input-wrap .settings-input{flex:1;min-width:0}.settings-confirm-btn{padding:8px 14px;border-radius:6px;border:none;background:var(--color-add, #538d4e);color:#fff;font-weight:600;font-size:.9rem;cursor:pointer;white-space:nowrap}.settings-confirm-btn:hover{filter:brightness(1.1)}.settings-status{font-size:.85rem;margin:4px 0 0}.settings-status.ok{color:var(--color-add, #538d4e)}.settings-status.saving{color:var(--text-secondary, #666)}.settings-status.error{color:#e53935}.settings-group-current{width:100%}.settings-group-code{font-size:.95rem;margin:0 0 4px;color:var(--text-primary)}.settings-group-hint{font-size:.85rem;color:var(--text-secondary);margin:0 0 12px}.settings-leave-btn{padding:8px 14px;border-radius:6px;border:1px solid var(--border-color);background:transparent;color:var(--text-secondary);font-size:.9rem;cursor:pointer}.settings-leave-btn:hover:not(:disabled){color:var(--text-primary);background:var(--bg-secondary)}.settings-leave-btn:disabled{opacity:.7;cursor:not-allowed}.settings-create-group{margin-top:12px;padding-top:12px;border-top:1px solid var(--border-color)}.settings-create-btn{padding:8px 14px;border-radius:6px;border:none;background:var(--bg-secondary);color:var(--text-primary);font-size:.9rem;font-weight:500;cursor:pointer}.settings-create-btn:hover:not(:disabled){background:var(--border-color)}.settings-create-btn:disabled{opacity:.7;cursor:not-allowed}.toggle-btn{width:44px;height:24px;border-radius:12px;background:var(--border-color);border:none;cursor:pointer;padding:2px;position:relative}.toggle-slider{display:block;width:20px;height:20px;border-radius:50%;background:var(--text-primary);transition:transform .2s;transform:translate(0)}.toggle-slider.on{transform:translate(20px)}.slider-wrap{display:flex;align-items:center;gap:10px}.intensity-slider{width:120px;height:6px;accent-color:var(--color-add)}.slider-value{font-size:.9rem;color:var(--text-secondary);min-width:28px}.leaderboard-embed{margin-top:20px;padding-top:16px;border-top:1px solid var(--border-color)}.leaderboard-view{display:flex;flex-direction:column;gap:24px}.leaderboard-scope-tabs{display:flex;gap:4px;margin-bottom:8px}.leaderboard-scope-btn{display:flex;align-items:center;gap:6px;padding:8px 14px;border:1px solid var(--border-color);background:var(--bg-secondary);color:var(--text-secondary);font-size:.9rem;font-weight:500;cursor:pointer;border-radius:8px}.leaderboard-scope-btn:hover{color:var(--text-primary);background:var(--bg-tertiary, rgba(255,255,255,.05))}.leaderboard-scope-btn.active{background:var(--color-add, #538d4e);color:#fff;border-color:var(--color-add, #538d4e)}.leaderboard-section h3.leaderboard-title{font-size:1rem;margin-bottom:10px;display:flex;align-items:center;gap:8px;color:var(--text-primary)}.leaderboard-loading,.leaderboard-empty{font-size:.9rem;color:var(--text-secondary);margin:8px 0}.leaderboard-mine{font-size:.9rem;margin-bottom:10px;color:var(--text-secondary)}.leaderboard-table-wrap{overflow-x:auto;margin-bottom:16px}.leaderboard-table{width:100%;border-collapse:collapse;font-size:.9rem}.leaderboard-table th,.leaderboard-table td{padding:8px 12px;text-align:left;border-bottom:1px solid var(--border-color)}.leaderboard-table th{color:var(--text-secondary);font-weight:600}.leaderboard-table tr.is-me{background:#538d4e26}.settings-footer{margin-top:24px;padding-top:16px;border-top:1px solid var(--border-color)}.settings-contact{font-size:.85rem;color:var(--text-secondary)}.settings-contact a{color:var(--accent, var(--color-add));text-decoration:none}.settings-contact a:hover{text-decoration:underline}.ftue-prompt{margin-bottom:20px;padding:14px 18px;border-radius:10px;background:var(--bg-secondary);border:1px solid var(--border-color)}.ftue-prompt-text{font-size:.95rem;color:var(--text-primary);margin:0 0 12px}.ftue-prompt-buttons{display:flex;gap:10px;flex-wrap:wrap}.ftue-btn{padding:8px 16px;border-radius:8px;font-size:.9rem;font-weight:600;cursor:pointer;border:none}.ftue-btn.primary{background:var(--color-add, #538d4e);color:#fff}.ftue-btn.primary:hover{filter:brightness(1.1)}.ftue-btn.secondary{background:transparent;color:var(--text-secondary);border:1px solid var(--border-color)}.ftue-btn.secondary:hover{color:var(--text-primary);background:var(--bg-tertiary, rgba(255,255,255,.05))}.pwa-prompt{left:0;right:0;margin-left:auto;margin-right:auto}.tutorial-screen{min-height:100vh;padding-bottom:env(safe-area-inset-bottom,0)}.tutorial-header .tutorial-badge{font-size:.7rem;padding:4px 10px;border-radius:6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:140px}@media(max-width:400px){.tutorial-header .tutorial-badge{font-size:.65rem;max-width:100px}}.tutorial-game-area{flex:1;display:flex;flex-direction:column;padding-bottom:0}.tutorial-overlay{position:fixed;bottom:0;left:0;right:0;padding:16px;padding-bottom:max(16px,env(safe-area-inset-bottom));display:flex;justify-content:center;align-items:flex-end;pointer-events:none}.tutorial-overlay>*{pointer-events:auto;width:100%;max-width:600px}.tutorial-bubble{background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--tile-radius);padding:20px;max-height:45vh;overflow-y:auto}.tutorial-progress{display:flex;gap:8px;justify-content:center;margin-bottom:16px}.tutorial-dot{width:8px;height:8px;border-radius:50%;background:var(--border-color);transition:background .2s}.tutorial-dot.active{background:var(--accent);transform:scale(1.2)}.tutorial-dot.done{background:var(--color-add)}.tutorial-text{font-size:clamp(.9rem,2.5vw,1rem);color:var(--text-primary);margin:0 0 16px;line-height:1.5}.tutorial-text em{color:var(--text-primary);font-style:normal;font-weight:600}.tutorial-hint{font-size:.85rem;color:var(--text-secondary);margin:0 0 8px}.tutorial-target{border-color:var(--accent)!important;box-shadow:0 0 0 2px #6aaa644d}