*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--bg:#0f172a;--card:#1e293b;--border:#334155;--digit-bg:#1e3a5f;--digit-border:#3b82f6;--digit-text:#60a5fa;--op-plus:#1d4ed8;--op-minus:#16a34a;--op-multiply:#b45309;--op-divide:#be123c;--op-equals:#7c3aed;--green:#4ade80;--red:#f87171;--orange:#fb923c;--text:#f8fafc;--muted:#94a3b8;--selected:#3b82f6}html{overflow-x:hidden}html,body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;min-height:100vh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}#root{flex-direction:column;min-height:100vh;display:flex}button{cursor:pointer;font-family:inherit;font-size:inherit;color:inherit;background:0 0;border:none}button:disabled{opacity:.4;cursor:not-allowed}.app{flex-direction:column;max-width:640px;min-height:100vh;margin:0 auto;padding:0 16px;display:flex}.nav{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;margin-bottom:4px;padding:12px 0;display:flex}.nav-logo{color:var(--digit-border);letter-spacing:-.5px;font-size:20px;font-weight:700}.nav-links{gap:8px;display:flex}.nav-btn{color:var(--muted);border-radius:6px;padding:6px 14px;font-size:13px;font-weight:500;transition:color .15s}.nav-btn:hover{color:var(--text)}.nav-btn.active{color:var(--digit-border)}.nav-btn-signin{background:var(--digit-border);color:#fff;border-radius:6px;padding:6px 14px;font-size:13px;font-weight:500}.nav-btn-signin:hover{background:#2563eb}.nav-btn-signout{color:var(--muted);border:1px solid var(--border);border-radius:6px;padding:6px 14px;font-size:13px}.nav-btn-signout:hover{color:var(--text);border-color:var(--muted)}.game{padding:12px 0 40px;position:relative}.game-header{justify-content:space-between;align-items:center;padding:8px 0 4px;display:flex}.game-title{color:var(--digit-border);letter-spacing:-.5px;font-size:22px;font-weight:700}.game-difficulty{color:#f59e0b;letter-spacing:2px;font-size:16px}.game-timer{color:var(--green);text-align:right;min-width:56px;font-family:Courier New,monospace;font-size:18px;font-weight:700}.game-subtitle{text-align:center;color:var(--muted);margin-bottom:4px;font-size:13px}.board-area{padding:8px 0}.digit-row-wrapper{-webkit-overflow-scrolling:touch;padding:8px 0;overflow-x:auto}.digit-row{flex-wrap:nowrap;justify-content:center;align-items:center;gap:2px;min-width:min-content;display:flex}.digit-row-cell{align-items:center;gap:2px;display:flex}.digit-tile{background:var(--digit-bg);border:2px solid var(--digit-border);width:42px;height:50px;color:var(--digit-text);-webkit-user-select:none;user-select:none;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;font-family:Courier New,monospace;font-size:24px;font-weight:700;display:flex}.slot{border:2px dashed var(--border);width:30px;height:36px;color:var(--muted);cursor:pointer;background:0 0;border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;font-size:14px;font-weight:700;transition:all .1s;display:flex}.slot-label{line-height:1}.slot:hover{border-color:var(--muted);background:#ffffff08;border-style:solid}.slot-selected{box-shadow:0 0 0 2px #3b82f659;border:2px solid var(--selected)!important;background:#3b82f61f!important;border-style:solid!important}.slot-filled{color:#fff;border-style:solid}.op-plus{background:var(--op-plus);border-color:var(--op-plus)}.op-minus{background:var(--op-minus);border-color:var(--op-minus)}.op-multiply{background:var(--op-multiply);border-color:var(--op-multiply)}.op-divide{background:var(--op-divide);border-color:var(--op-divide)}.op-equals{background:var(--op-equals);border-color:var(--op-equals)}.op-empty{background:0 0}.btn-primary{background:var(--digit-border);color:#fff;text-align:center;border-radius:10px;width:100%;margin-top:12px;padding:14px;font-size:16px;font-weight:600;transition:background .15s;display:block}.btn-primary:hover:not(:disabled){background:#2563eb}.give-up-area{text-align:center;margin-top:12px}.btn-giveup{color:var(--muted);border-radius:6px;padding:6px 12px;font-size:13px;transition:color .15s}.btn-giveup:hover{color:var(--red)}.give-up-confirm{background:var(--card);border:1px solid var(--border);color:var(--muted);border-radius:8px;flex-wrap:wrap;justify-content:center;align-items:center;gap:8px;padding:8px;font-size:13px;display:flex}.btn-giveup-confirm{background:var(--red);color:#fff;border-radius:6px;padding:6px 14px;font-size:13px;font-weight:600}.btn-cancel{border:1px solid var(--border);color:var(--muted);border-radius:6px;padding:6px 14px;font-size:13px}.toast{background:var(--card);border:1px solid var(--border);color:var(--text);z-index:200;white-space:nowrap;border-radius:20px;padding:10px 20px;font-size:14px;position:fixed;bottom:24px;left:50%;transform:translate(-50%);box-shadow:0 4px 24px #0006}.game-loading,.game-error{color:var(--muted);text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:12px;padding:60px 20px;display:flex}.overlay{z-index:100;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:#0f172ad9;justify-content:center;align-items:center;padding:16px;display:flex;position:fixed;inset:0}.overlay-card{background:var(--card);border:1px solid var(--border);text-align:center;border-radius:16px;width:100%;max-width:380px;padding:28px 24px;box-shadow:0 20px 60px #00000080}.overlay-emoji{margin-bottom:8px;font-size:48px}.overlay-heading{color:var(--text);margin-bottom:16px;font-size:28px;font-weight:700}.overlay-stats{justify-content:center;gap:24px;margin-bottom:16px;display:flex}.stat{flex-direction:column;align-items:center;display:flex}.stat-label{color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:2px;font-size:11px}.stat-value{color:var(--green);font-size:20px;font-weight:700}.overlay-count{color:var(--muted);margin-bottom:12px;font-size:13px}.overlay-signin-hint{color:var(--muted);background:#3b82f614;border:1px solid #3b82f633;border-radius:8px;margin:8px 0;padding:8px 12px;font-size:12px}.leaderboard-preview{background:var(--bg);border-radius:8px;margin:12px 0;padding:10px 12px}.lb-title{text-transform:uppercase;letter-spacing:.5px;color:var(--muted);margin-bottom:8px;font-size:12px}.lb-row{align-items:center;gap:8px;padding:4px 0;font-size:14px;display:flex}.lb-rank{color:var(--muted);min-width:28px}.lb-user{text-align:left;color:var(--text);flex:1;font-weight:500}.lb-time{color:var(--green);font-family:Courier New,monospace;font-size:13px}.overlay-position{color:var(--muted);margin-top:8px;font-size:14px}.reveal-solution{background:var(--bg);border-radius:8px;margin:12px 0;padding:14px 16px}.reveal-label{color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-bottom:6px;font-size:12px}.reveal-eq{color:var(--digit-border);word-break:break-all;font-family:Courier New,monospace;font-size:20px;font-weight:700}.reveal-count{color:var(--muted);margin-top:4px;font-size:12px}.streak-broken{color:var(--red);margin:8px 0;font-size:14px}.puzzle-locked{color:var(--muted);background:var(--bg);border-radius:6px;margin:4px 0;padding:6px 12px;font-size:14px;display:inline-block}.overlay-teaser{color:var(--muted);margin-top:12px;font-size:13px}@media (width<=430px){.digit-tile{width:34px;height:42px;font-size:20px}.slot{width:24px;height:30px;font-size:12px}.overlay-card{padding:20px 16px}.overlay-heading{font-size:24px}}.operator-picker{padding:8px 0 12px}.picker-hint{text-align:center;color:var(--muted);margin-bottom:10px;font-size:13px}.picker-grid{grid-template-columns:repeat(6,1fr);gap:8px;display:grid}.op-btn{color:#fff;border:2px solid #0000;border-radius:10px;justify-content:center;align-items:center;height:52px;font-size:20px;font-weight:700;transition:all .1s;display:flex}.op-btn:hover:not(:disabled){transform:scale(1.05)}.op-btn:active:not(:disabled){transform:scale(.97)}.op-btn:disabled{opacity:.35}.op-btn-active{transform:scale(1.05);box-shadow:0 0 0 3px #fff6}.op-btn-plus{background:var(--op-plus)}.op-btn-minus{background:var(--op-minus)}.op-btn-multiply{background:var(--op-multiply)}.op-btn-divide{background:var(--op-divide)}.op-btn-equals{background:var(--op-equals)}.op-btn-backspace{background:var(--card);border:2px solid var(--border);color:var(--muted);font-size:18px}.op-btn-backspace:hover:not(:disabled){border-color:var(--muted);color:var(--text)}@media (width<=400px){.picker-grid{gap:6px}.op-btn{height:48px;min-height:44px;font-size:18px}}.equation-preview{border:2px solid var(--border);background:var(--card);text-align:center;border-radius:10px;padding:12px 16px;transition:border-color .2s}.preview-neutral{border-color:var(--border)}.preview-balanced{border-color:var(--green);background:#4ade800d}.preview-unbalanced{border-color:var(--orange);background:#fb923c0d}.preview-eq{color:var(--text);letter-spacing:.5px;word-break:break-all;font-family:Courier New,monospace;font-size:18px;font-weight:600}.preview-status{margin-top:6px;font-size:13px}.preview-neutral .preview-status{color:var(--muted)}.preview-balanced .preview-status{color:var(--green);font-weight:600}.preview-unbalanced .preview-status{color:var(--orange)}.leaderboard-page{padding:12px 0 40px}.lb-page-header{justify-content:space-between;align-items:center;padding:8px 0 16px;display:flex}.lb-page-title{color:var(--digit-border);letter-spacing:-.5px;font-size:22px;font-weight:700}.lb-back-btn{color:var(--muted);border:1px solid var(--border);border-radius:6px;padding:6px 12px;font-size:13px;transition:color .15s,border-color .15s}.lb-back-btn:hover{color:var(--text);border-color:var(--muted)}.lb-date-picker{justify-content:center;align-items:center;gap:12px;margin-bottom:16px;padding:12px 0;display:flex}.lb-date-nav{border:1px solid var(--border);width:32px;height:32px;color:var(--muted);border-radius:6px;justify-content:center;align-items:center;font-size:16px;transition:color .15s,border-color .15s;display:flex}.lb-date-nav:hover:not(:disabled){color:var(--text);border-color:var(--muted)}.lb-date-nav:disabled{opacity:.3}.lb-date-label{color:var(--text);text-align:center;min-width:80px;font-size:15px;font-weight:600}.lb-signin-banner{color:var(--muted);background:#3b82f614;border:1px solid #3b82f633;border-radius:8px;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px;padding:10px 14px;font-size:13px;display:flex}.lb-signin-banner-btn{background:var(--digit-border);color:#fff;white-space:nowrap;border-radius:6px;flex-shrink:0;padding:5px 12px;font-size:12px;font-weight:600}.lb-signin-banner-btn:hover{background:#2563eb}.lb-loading,.lb-error,.lb-empty{text-align:center;color:var(--muted);padding:40px 20px;font-size:14px}.lb-error{color:var(--red)}.lb-table{border-collapse:collapse;width:100%;font-size:14px}.lb-table thead tr{border-bottom:1px solid var(--border)}.lb-table th{text-align:left;text-transform:uppercase;letter-spacing:.5px;color:var(--muted);padding:6px 8px;font-size:11px;font-weight:600}.lb-table th.col-rank{text-align:center;width:40px}.lb-table th.col-time,.lb-table th.col-equation{text-align:right}.lb-table td{vertical-align:middle;border-bottom:1px solid #33415580;padding:10px 8px}.lb-table tr:last-child td{border-bottom:none}.lb-row-own{background:#3b82f614}.lb-row-own td{border-bottom-color:#3b82f626!important}.td-rank{text-align:center;width:40px;font-size:18px}.rank-number{color:var(--muted);font-size:13px;font-weight:700}.td-user{color:var(--text);max-width:140px;font-weight:500}.user-id-truncated{text-overflow:ellipsis;white-space:nowrap;max-width:140px;display:block;overflow:hidden}.td-time{text-align:right;color:var(--green);white-space:nowrap;font-family:Courier New,monospace;font-size:13px}.td-equation{text-align:right;color:var(--muted);white-space:nowrap;font-family:Courier New,monospace;font-size:12px}.profile-page{padding:12px 0 40px}.profile-header{justify-content:space-between;align-items:center;padding:8px 0 16px;display:flex}.profile-title{color:var(--digit-border);letter-spacing:-.5px;font-size:22px;font-weight:700}.profile-back-btn{color:var(--muted);border:1px solid var(--border);border-radius:6px;padding:6px 12px;font-size:13px;transition:color .15s,border-color .15s}.profile-back-btn:hover{color:var(--text);border-color:var(--muted)}.auth-gate{text-align:center;color:var(--muted);flex-direction:column;justify-content:center;align-items:center;gap:16px;padding:60px 20px;font-size:15px;display:flex}.auth-gate button{background:var(--digit-border);color:#fff;border-radius:8px;padding:10px 24px;font-size:14px;font-weight:600}.auth-gate button:hover{background:#2563eb}.profile-loading,.profile-error{text-align:center;color:var(--muted);padding:40px 20px;font-size:14px}.profile-error{color:var(--red)}.profile-stats-grid{grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:28px;display:grid}.profile-stat-card{background:var(--card);border:1px solid var(--border);text-align:center;border-radius:10px;padding:14px 12px}.profile-stat-value{color:var(--green);margin-bottom:4px;font-size:28px;font-weight:700;line-height:1.1}.profile-stat-label{color:var(--muted);text-transform:uppercase;letter-spacing:.5px;font-size:11px}.profile-section-title{text-transform:uppercase;letter-spacing:.5px;color:var(--muted);margin-bottom:10px;font-size:13px;font-weight:600}.profile-results-list{background:var(--card);border:1px solid var(--border);border-radius:10px;flex-direction:column;gap:0;display:flex;overflow:hidden}.profile-result-row{border-bottom:1px solid var(--border);align-items:center;gap:12px;padding:11px 14px;display:flex}.profile-result-row:last-child{border-bottom:none}.profile-result-date{color:var(--muted);min-width:72px;font-size:13px}.profile-result-indicator{flex-shrink:0;font-size:16px}.profile-result-status{color:var(--text);flex:1;font-size:13px}.status-solved{color:var(--green)}.status-gaveup{color:var(--red)}.status-not-played{color:var(--muted)}.profile-result-time{color:var(--green);text-align:right;font-family:Courier New,monospace;font-size:13px}