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.exercise-card:hover{border-color:var(--sunshine);transform:translateY(-1px)}.exercise-card.active{background:var(--bg-subtle);border-color:var(--secondary);border-left-width:4px;border-left-color:var(--primary)}.app[data-theme=kids] .exercise-card.active{border-color:var(--sunshine);background:linear-gradient(135deg,#fff5cc,#ffedaa);border-left-width:3px;transform:scale(1.01);box-shadow:0 2px #ffb80066}.exercise-card.completed{opacity:.8}.exercise-card-main{align-items:flex-start;gap:8px;display:flex}.exercise-icon{margin-top:1px;font-size:20px}.app[data-theme=kids] .exercise-icon{font-size:20px}.exercise-card-info{flex:1;min-width:0}.exercise-card-title{font-family:var(--font-titles);color:var(--text-main);white-space:normal;word-wrap:break-word;margin-bottom:4px;font-size:13px;font-weight:600;line-height:1.3}.app[data-theme=kids] .exercise-card-title{margin-bottom:2px;font-size:13px;font-weight:700;line-height:1.25}.exercise-card-meta{align-items:center;gap:8px;display:flex}.xp-tag{font-family:var(--font-titles);color:#f59e0b;font-size:11px;font-weight:600}.app[data-theme=kids] .xp-tag{color:#e67e22;font-size:11px;font-weight:700}.completed-check{color:#10b981;font-size:16px;font-weight:700}.app[data-theme=kids] .completed-check{text-shadow:0 2px 4px #2ecc7166;font-size:20px;font-weight:900}.difficulty-badge{font-family:var(--font-titles);border-radius:var(--border-radius-pill);text-transform:uppercase;letter-spacing:.5px;padding:2px 8px;font-size:10px;font-weight:600}.difficulty-badge.beginner{color:#10b981;background:#10b9811f;border:1px solid #10b98140}.difficulty-badge.intermediate{color:#f59e0b;background:#f59e0b1f;border:1px solid #f59e0b40}.app[data-theme=kids] .difficulty-badge{border-radius:999px!important;font-size:11px!important;font-weight:700!important}.active-exercise-container{flex-direction:column;flex:1;gap:14px;padding:16px;display:flex;overflow-y:auto}.app[data-theme=kids] .active-exercise-container{gap:8px;padding:10px 14px}.active-title-row{align-items:center;gap:12px;margin-bottom:6px;display:flex}.app[data-theme=kids] .active-title-row{gap:8px;margin-bottom:2px}.active-icon{font-size:28px}.app[data-theme=kids] .active-icon{font-size:24px;animation:3s ease-in-out infinite logo-bounce}.active-title{font-family:var(--font-titles);color:var(--text-main);margin:0;font-size:18px;font-weight:700}.app[data-theme=kids] .active-title{color:var(--primary-dark);font-size:17px;font-weight:800}.active-subtitle{font-family:var(--font-titles);color:var(--text-muted);font-size:12px;font-weight:500}.app[data-theme=kids] 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.step-label{color:var(--sky);font-size:12px;font-weight:800}.step-pills{gap:6px;display:flex}.step-pill{border-radius:var(--border-radius-pill);border:1px solid var(--border-light);background:var(--bg-app);width:28px;height:28px;color:var(--text-main);font-family:var(--font-titles);cursor:pointer;transition:all var(--transition-fast);justify-content:center;align-items:center;font-size:13px;font-weight:600;display:flex}.app[data-theme=kids] .step-pill{border:2px solid var(--border-light);border-radius:50%;width:28px;height:28px;font-size:13px;font-weight:800}.step-pill:hover{border-color:var(--primary)}.app[data-theme=kids] .step-pill:hover{transform:scale(1.1)}.step-pill.active{background:var(--primary);color:#fff;border-color:var(--primary-dark)}.app[data-theme=kids] .step-pill.active{box-shadow:0 2px 0 var(--primary-dark);transform:scale(1.08)}.current-step-card{flex-direction:column;gap:10px;display:flex}.step-target-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;display:flex}.step-number-badge{font-family:var(--font-titles);color:var(--secondary);border-radius:var(--border-radius-pill);background:#0284c71f;padding:3px 10px;font-size:12px;font-weight:600}.app[data-theme=kids] .step-number-badge{color:#1976d2;background:#e3f2ff;border-radius:999px;font-size:13px;font-weight:800}.target-cell-indicator{font-family:var(--font-mono);color:#059669;border-radius:var(--border-radius-pill);background:#10b9811f;padding:3px 10px;font-size:12px;font-weight:700}.app[data-theme=kids] .target-cell-indicator{color:#0b8a5c;background:#d9f9ec;border-radius:999px;font-size:13px;font-weight:800;animation:1.6s ease-in-out infinite target-glow}@keyframes target-glow{0%,to{box-shadow:0 0 #4ecdc499}50%{box-shadow:0 0 0 5px #4ecdc400}}.step-instruction{color:var(--text-main);margin:0;font-size:14px;font-weight:500;line-height:1.5}.app[data-theme=kids] .step-instruction{font-size:13.5px;font-weight:700;line-height:1.35}.helper-toggle-wrapper{margin-top:4px}.btn-helper-toggle{font-family:var(--font-titles);color:var(--secondary);cursor:pointer;text-underline-offset:2px;background:0 0;border:none;padding:2px 0;font-size:13px;font-weight:600;text-decoration:underline}.app[data-theme=kids] .btn-helper-toggle{color:#1976d2;font-size:13px;font-weight:700;text-decoration:none}.app[data-theme=kids] .btn-helper-toggle:hover{-webkit-text-decoration:underline wavy;text-decoration:underline wavy}.btn-helper-toggle.explanation{color:var(--purple)}.helper-box{border-radius:var(--radius-sm);margin-top:6px;padding:12px;font-size:13px;font-weight:400;line-height:1.5;animation:.2s ease-out popIn}.app[data-theme=kids] .helper-box{padding:8px 10px;font-size:13px;font-weight:600}.hint-box{color:var(--text-main);background:#f59e0b1a;border:1px solid #f59e0b4d}.app[data-theme=kids] .hint-box{color:#8a6d00;background:#fffbe6;border:2px solid #ffe08a}.explanation-box{color:var(--text-main);background:#6366f11a;border:1px solid #6366f14d}.app[data-theme=kids] .explanation-box{color:#6a3fb5;background:#f6f1ff;border:2px solid #ddd0ff}.expected-formula-snippet{margin-top:8px;font-size:12px}.expected-formula-snippet code{font-family:var(--font-mono);color:var(--primary);background:#00000014;border-radius:4px;padding:2px 6px;font-weight:600}.app[data-theme=adult-dark] .expected-formula-snippet code{background:#ffffff1a}.panel-actions{background:var(--bg-sidebar);border-top:1px solid var(--border-light);flex-direction:column;flex-shrink:0;gap:8px;padding:14px 16px 16px;display:flex}.app[data-theme=kids] .panel-actions{border-top:2px dashed var(--border-light);gap:6px;padding:8px 14px 10px}.nav-btn-row{gap:8px;display:flex}.btn-secondary{font-family:var(--font-titles);border:1px solid var(--border-light);background:var(--bg-surface);color:var(--text-main);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);flex:1;padding:8px 12px;font-size:13px;font-weight:600}.app[data-theme=kids] .btn-secondary{border:2px solid var(--border-light);padding:6px 10px;font-size:13px;font-weight:700}.btn-secondary:hover:not(:disabled){background:var(--bg-subtle);border-color:var(--border-dark)}.app[data-theme=kids] .btn-secondary:hover:not(:disabled){background:#fff5cc;transform:translateY(-1px)}.btn-secondary:disabled{opacity:.45;cursor:not-allowed}.check-btn-row{gap:8px;display:flex}.btn-check-answer{font-family:var(--font-titles);background:var(--primary);color:#fff;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);box-shadow:var(--shadow-sm);border:none;flex:1;padding:10px 14px;font-size:14px;font-weight:700}.app[data-theme=kids] .btn-check-answer{border-radius:var(--radius-md);background:linear-gradient(135deg,#2ecc71 0%,#27ae60 100%);padding:9px 14px;font-size:15px;font-weight:800;box-shadow:0 3px #1d8a48}.btn-check-answer:hover{filter:brightness(1.08)}.app[data-theme=kids] .btn-check-answer:hover{transform:translateY(-1px)}.app[data-theme=kids] .btn-check-answer:active{transform:translateY(2px);box-shadow:0 1px #1d8a48}.btn-reset{font-family:var(--font-titles);border:1px solid var(--border-light);background:var(--bg-surface);color:var(--text-muted);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);padding:10px 14px;font-size:13px;font-weight:600}.app[data-theme=kids] .btn-reset{color:var(--primary-dark);background:#fff5f5;border:2px solid #ffd0d0;padding:8px 12px;font-size:13px;font-weight:700}.btn-reset:hover{color:var(--text-main);background:var(--bg-subtle)}.app[data-theme=kids] .btn-reset:hover{transform:rotate(-8deg)scale(1.05)}.result-alert{border-radius:var(--radius-sm);padding:10px 12px;font-size:13px;font-weight:500;line-height:1.4;animation:.2s ease-out popIn}.app[data-theme=kids] .result-alert{padding:12px 14px;font-size:14px;font-weight:700}.result-alert.success{color:#10b981;background:#10b98126;border:1px solid #10b98159}.app[data-theme=kids] .result-alert.success{color:#148f4a;background:#e6fcf0;border:3px solid #7bedb0}.result-alert.error{color:#ef4444;background:#ef444426;border:1px solid #ef444459}.app[data-theme=kids] .result-alert.error{color:#d63031;background:#fff0f0;border:3px solid #ffb3b3}.formula-bar-container{background:var(--bg-surface);border-bottom:1px solid var(--border-light);z-index:10;transition:all var(--transition-normal);align-items:center;gap:10px;padding:8px 16px;display:flex}.app[data-theme=kids] .formula-bar-container{border-bottom:4px solid var(--border-dark)}.cell-reference-box{min-width:56px;font-family:var(--font-mono);color:var(--primary);border:1px solid var(--border-light);background:var(--bg-subtle);text-align:center;border-radius:var(--radius-sm);padding:5px 8px;font-size:14px;font-weight:700}.app[data-theme=kids] .cell-reference-box{min-width:64px;color:var(--primary-dark);border:3px solid var(--border-light);background:var(--bg-app);font-size:16px;font-weight:800}.fx-button-wrapper{position:relative}.fx-button{color:var(--text-muted);background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);padding:4px 10px;font-family:Georgia,serif;font-size:15px;font-style:italic;font-weight:700}.app[data-theme=kids] .fx-button{border:3px solid var(--border-light);padding:3px 12px;font-size:17px;font-weight:800}.fx-button:hover{color:var(--primary);border-color:var(--primary)}.app[data-theme=kids] .fx-button:hover{transform:rotate(-5deg)scale(1.1)}.fx-help-menu{background:var(--bg-surface);border:1px solid var(--border-dark);border-radius:var(--radius-md);width:280px;box-shadow:var(--shadow-lg);z-index:100;margin-top:6px;padding:8px;animation:.15s ease-out popIn;position:absolute;top:100%;left:0}.app[data-theme=kids] .fx-help-menu{border:3px solid var(--sunshine);width:260px}.fx-menu-title{font-family:var(--font-titles);text-transform:uppercase;color:var(--text-muted);border-bottom:1px solid var(--border-light);margin-bottom:4px;padding:6px 10px;font-size:12px;font-weight:700}.app[data-theme=kids] .fx-menu-title{border-bottom:2px dashed var(--border-light);font-size:14px;font-weight:800}.fx-menu-item{text-align:left;cursor:pointer;border-radius:var(--radius-sm);width:100%;transition:background var(--transition-fast);background:0 0;border:none;flex-direction:column;padding:8px 10px;display:flex}.fx-menu-item:hover{background:var(--bg-subtle)}.app[data-theme=kids] .fx-menu-item:hover{background:#fff5cc}.fx-item-name{font-family:var(--font-titles);color:var(--primary);font-size:13px;font-weight:700}.app[data-theme=kids] .fx-item-name{color:var(--primary-dark);font-size:15px;font-weight:800}.fx-item-desc{color:var(--text-muted);font-size:12px;font-weight:400}.app[data-theme=kids] .fx-item-desc{font-size:13px;font-weight:600}.formula-equals-sign{color:var(--text-muted);font-size:18px;font-weight:700;font-family:var(--font-mono)}.app[data-theme=kids] .formula-equals-sign{color:var(--primary);font-size:22px;font-weight:900;font-family:var(--font-titles)}.formula-input-field{border:1px solid var(--border-light);border-radius:var(--radius-sm);font-size:14px;font-weight:500;font-family:var(--font-mono);background:var(--bg-surface);color:var(--text-main);transition:all var(--transition-fast);outline:none;flex:1;padding:6px 12px}.app[data-theme=kids] .formula-input-field{border:3px solid var(--border-light);padding:6px 14px;font-size:16px;font-weight:600}.formula-input-field:focus{border-color:var(--secondary);box-shadow:0 0 0 3px #0284c726}.app[data-theme=kids] .formula-input-field:focus{border-color:var(--secondary);box-shadow:0 0 0 4px #4ecdc433}.formula-input-field::placeholder{color:var(--text-muted);font-family:var(--font-body)}.spreadsheet-container{border:1px solid var(--border-dark);border-radius:var(--radius-md);background:var(--bg-surface);box-shadow:var(--shadow-md);-webkit-user-select:none;user-select:none;outline:none;position:relative;overflow:hidden}.app[data-theme=kids] .spreadsheet-container{border:3px solid var(--border-dark);border-radius:var(--radius-md)}.grid-header-corner{background:var(--grid-header-bg);border-right:1px solid var(--grid-cell-border);border-bottom:1px solid var(--grid-cell-border)}.app[data-theme=kids] .grid-header-corner{border-right:2px solid var(--border-light);border-bottom:2px solid var(--border-light)}.grid-col-header{background:var(--grid-header-bg);border-right:1px solid var(--grid-cell-border);border-bottom:1px solid var(--grid-cell-border);text-align:center;line-height:32px;font-family:var(--font-titles);color:var(--grid-header-color);transition:all var(--transition-fast);font-size:12px;font-weight:600}.app[data-theme=kids] .grid-col-header{border-right:2px solid var(--border-light);border-bottom:2px solid var(--border-light);font-size:14px;font-weight:800}.grid-col-header.active-header{background:var(--grid-header-active-bg);color:var(--grid-header-active-color);font-weight:700}.grid-row-header{background:var(--grid-header-bg);border-right:1px solid var(--grid-cell-border);border-bottom:1px solid var(--grid-cell-border);text-align:center;line-height:28px;font-family:var(--font-titles);color:var(--grid-header-color);transition:all var(--transition-fast);font-size:11px;font-weight:600}.app[data-theme=kids] .grid-row-header{border-right:2px solid var(--border-light);border-bottom:2px solid var(--border-light);font-size:13px;font-weight:800}.grid-row-header.active-header{background:var(--grid-header-active-bg);color:var(--grid-header-active-color);font-weight:700}.grid-cell{border-right:1px solid var(--grid-cell-border);border-bottom:1px solid var(--grid-cell-border);background:var(--grid-cell-bg);color:var(--text-main);font-size:13px;font-weight:500;font-family:var(--font-body);cursor:pointer;transition:background-color var(--transition-fast);align-items:center;padding:0 8px;display:flex;position:relative}.app[data-theme=kids] .grid-cell{border-right:2px solid var(--grid-cell-border);border-bottom:2px solid var(--grid-cell-border);font-size:15px;font-weight:700}.grid-cell.selected{outline:2px solid var(--grid-cell-selected-border);outline-offset:-2px;z-index:5;background:var(--grid-cell-selected-bg)!important}.app[data-theme=kids] .grid-cell.selected{outline:3px solid var(--secondary);outline-offset:-3px}@keyframes adult-pulse{0%{box-shadow:inset 0 0 0 2px var(--grid-target-pulse), 0 0 0 0 #10b98166}70%{box-shadow:inset 0 0 0 2px var(--grid-target-pulse), 0 0 0 6px #10b98100}to{box-shadow:inset 0 0 0 2px var(--grid-target-pulse), 0 0 0 0 #10b98100}}.grid-cell.target-pulse{z-index:4;animation:1.6s infinite adult-pulse;background:var(--grid-cell-selected-bg)!important}.app[data-theme=kids] .grid-cell.target-pulse{animation:1.5s infinite pulse-glow}.cell-display-text{text-overflow:ellipsis;white-space:nowrap;width:100%;overflow:hidden}.cell-input-wrapper{align-items:center;width:100%;height:100%;display:flex;position:relative}.cell-editor-input{width:100%;height:100%;font-family:var(--font-mono);color:var(--text-main);background:0 0;border:none;outline:none;margin:0;padding:0;font-size:13px;font-weight:600}.app[data-theme=kids] .cell-editor-input{font-size:15px;font-weight:700}.formula-suggestions-popover{background:var(--bg-surface);border:1px solid var(--border-dark);border-radius:var(--radius-md);width:250px;box-shadow:var(--shadow-lg);z-index:50;max-height:180px;margin-top:4px;padding:6px;animation:.15s ease-out popIn;position:absolute;top:100%;left:0;overflow-y:auto}.app[data-theme=kids] .formula-suggestions-popover{border:3px solid var(--sunshine);width:240px}.suggestion-item{border-radius:var(--radius-sm);cursor:pointer;flex-direction:column;padding:6px 10px;font-size:12px;display:flex}.suggestion-item:hover{background:var(--bg-subtle)}.app[data-theme=kids] .suggestion-item:hover{background:#fff5cc}.suggestion-item strong{font-family:var(--font-titles);color:var(--primary);font-size:13px}.app[data-theme=kids] .suggestion-item strong{color:var(--primary-dark);font-size:15px}.syntax-hint{color:var(--text-muted);font-size:11px;font-family:var(--font-mono)}.celebration-overlay{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:1000;background:#0f172aa6;justify-content:center;align-items:center;animation:.2s ease-out fadeIn;display:flex;position:fixed;inset:0}.confetti-canvas{pointer-events:none;position:absolute;inset:0}.celebration-card{background:var(--bg-surface);border:1px solid var(--border-dark);border-radius:var(--radius-lg);text-align:center;width:90%;max-width:440px;box-shadow:var(--shadow-lg);z-index:1010;padding:32px 36px;animation:.3s cubic-bezier(.16,1,.3,1) modalIn;position:relative}.app[data-theme=kids] .celebration-card{border:5px solid var(--sunshine);border-radius:28px;animation:.5s cubic-bezier(.175,.885,.32,1.275) bounceIn}@keyframes modalIn{0%{opacity:0;transform:scale(.92)translateY(10px)}to{opacity:1;transform:scale(1)translateY(0)}}@keyframes bounceIn{0%{opacity:0;transform:scale(.5)}to{opacity:1;transform:scale(1)}}.celebration-icon{margin-bottom:8px;font-size:54px;display:inline-block}.app[data-theme=kids] .celebration-icon{margin-bottom:10px;font-size:72px;animation:1.2s ease-in-out infinite logo-bounce}.celebration-title{font-family:var(--font-titles);color:var(--text-main);margin:0 0 8px;font-size:22px;font-weight:700}.app[data-theme=kids] .celebration-title{color:var(--primary-dark);text-shadow:2px 2px #ffd93d80;font-size:30px;font-weight:800}.celebration-subtitle{color:var(--text-muted);margin:0 0 18px;font-size:14px;font-weight:400;line-height:1.5}.app[data-theme=kids] .celebration-subtitle{font-size:17px;font-weight:700}.xp-reward-box{background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:var(--border-radius-pill);align-items:center;gap:8px;margin-bottom:22px;padding:8px 20px;display:inline-flex}.app[data-theme=kids] .xp-reward-box{background:linear-gradient(135deg,#ffe66d 0%,#ffd93d 100%);border:3px solid #ffb800;border-radius:999px;gap:10px;padding:10px 26px;box-shadow:0 5px #ffb80080}.xp-reward-replay{text-align:left;border-radius:10px;grid-template-columns:auto 1fr;justify-items:start;padding:10px 20px;display:inline-grid}.xp-replay-note{color:var(--text-muted);grid-column:2;font-size:13px;font-weight:500}.xp-star{font-size:20px}.app[data-theme=kids] .xp-star{font-size:26px}.xp-amount{font-family:var(--font-titles);color:var(--primary);font-size:18px;font-weight:700}.app[data-theme=kids] .xp-amount{color:#7a5200;font-size:24px;font-weight:800}.celebration-actions{flex-direction:column;gap:10px;display:flex}.btn-next-lesson{font-family:var(--font-titles);background:var(--primary);color:#fff;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);border:none;padding:12px;font-size:15px;font-weight:700}.app[data-theme=kids] .btn-next-lesson{border-radius:var(--radius-md);background:linear-gradient(135deg,#2ecc71 0%,#27ae60 100%);padding:15px;font-size:20px;font-weight:800;box-shadow:0 5px #1d8a48}.btn-next-lesson:hover{filter:brightness(1.08)}.app[data-theme=kids] .btn-next-lesson:hover{transform:translateY(-3px)scale(1.02)}.app[data-theme=kids] .btn-next-lesson:active{transform:translateY(3px);box-shadow:0 2px #1d8a48}.btn-close-modal{font-family:var(--font-titles);color:var(--text-muted);cursor:pointer;background:0 0;border:none;padding:8px;font-size:13px;font-weight:500}.app[data-theme=kids] .btn-close-modal{padding:10px;font-size:15px;font-weight:700}.btn-close-modal:hover{color:var(--text-main)}.app[data-theme=kids] .btn-close-modal:hover{-webkit-text-decoration:underline wavy;text-decoration:underline wavy}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes popIn{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}.adsense-container{background:var(--bg-app);border-top:2px solid var(--border-light);z-index:15;transition:all var(--transition-normal);flex-direction:column;flex-shrink:0;justify-content:center;align-items:center;margin-top:28px;padding:14px 20px 12px;display:flex}.app[data-theme=kids] .adsense-container{background:var(--bg-sidebar);border-top:3px dashed var(--border-light);padding:14px 20px 12px}.adsense-label-row{justify-content:space-between;align-items:center;width:100%;max-width:960px;margin-bottom:4px;display:flex}.adsense-label{font-family:var(--font-titles);letter-spacing:.8px;color:var(--text-muted);text-transform:uppercase;font-size:10px;font-weight:700}.adsense-info{font-family:var(--font-mono);color:var(--text-muted);font-size:10px}.app[data-theme=kids] .adsense-info{font-family:var(--font-titles);color:var(--primary-dark);font-weight:700}.adsense-slot-wrapper{align-items:center;width:100%;max-width:960px;min-height:52px;display:flex}.adsense-placeholder-mock{background:var(--bg-subtle);border:1px dashed var(--border-dark);border-radius:var(--radius-sm);width:100%;transition:all var(--transition-fast);justify-content:space-between;align-items:center;gap:12px;padding:6px 14px;display:flex}.app[data-theme=kids] .adsense-placeholder-mock{border-radius:var(--radius-md);background:#fff8d6;border:2px dashed #f59e0b;padding:8px 16px}.ad-mock-content{flex-direction:column;gap:2px;min-width:0;display:flex}.ad-mock-brand{align-items:center;gap:8px;display:flex}.ad-google-badge{color:#fff;font-family:var(--font-titles);background:#4285f4;border-radius:3px;padding:1px 6px;font-size:10px;font-weight:800;line-height:1.2}.ad-title{font-family:var(--font-titles);color:var(--text-main);white-space:nowrap;text-overflow:ellipsis;font-size:13px;font-weight:700;overflow:hidden}.app[data-theme=kids] .ad-title{color:#7a5200;font-size:14px}.ad-desc{color:var(--text-muted);white-space:nowrap;text-overflow:ellipsis;margin:0;font-size:11px;line-height:1.3;overflow:hidden}.app[data-theme=kids] .ad-desc{font-size:12px;font-weight:600}.ad-cta-button{font-family:var(--font-titles);background:var(--primary);color:#fff;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);border:none;flex-shrink:0;padding:5px 14px;font-size:12px;font-weight:700}.app[data-theme=kids] .ad-cta-button{background:linear-gradient(135deg,#ff6b6b,#ff9a56);border-radius:999px;padding:7px 16px;font-size:13px;box-shadow:0 2px #ee5253}.ad-cta-button:hover{filter:brightness(1.1);transform:translateY(-1px)}.toolbar-tools{align-items:center;gap:6px;margin-left:auto;display:flex}.quick-sort-group{background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:var(--radius-sm);align-items:center;padding:1px;display:flex}.tool-action-btn{font-family:var(--font-titles);color:var(--text-main);background:var(--bg-surface);border:1px solid var(--border-light);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);white-space:nowrap;align-items:center;gap:5px;padding:5px 10px;font-size:12px;font-weight:600;display:inline-flex}.app[data-theme=kids] .tool-action-btn{border:2px solid var(--border-light);border-radius:var(--radius-md);box-shadow:0 2px 0 var(--border-light);padding:5px 12px;font-size:13px;font-weight:800}.tool-action-btn:hover{background:var(--bg-subtle);border-color:var(--primary);color:var(--primary)}.app[data-theme=kids] .tool-action-btn:hover{box-shadow:0 4px 0 var(--border-light);transform:translateY(-2px)}.quick-sort-btn{font-family:var(--font-mono);background:0 0;border:none;padding:3px 6px;font-size:11px;font-weight:700}.highlight-tool-btn{background:var(--bg-subtle);border-color:var(--border-dark);font-weight:700}.app[data-theme=kids] .highlight-tool-btn{color:#7a5200;background:linear-gradient(135deg,#fff3b0 0%,#ffd93d 100%);border-color:#f59e0b}.modal-backdrop{-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);z-index:1050;background:#0f172aa6;justify-content:center;align-items:center;padding:16px;animation:.2s ease-out fadeIn;display:flex;position:fixed;inset:0}.modal-content{background:var(--bg-surface);border:1px solid var(--border-dark);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);flex-direction:column;max-height:90vh;animation:.25s cubic-bezier(.16,1,.3,1) modalIn;display:flex;overflow:hidden}.app[data-theme=kids] .modal-content{border:4px solid var(--sunshine);border-radius:24px}.sort-modal{width:100%;max-width:480px}.pivot-modal{width:100%;max-width:860px}.modal-header{border-bottom:1px solid var(--border-light);align-items:center;gap:12px;padding:16px 20px;display:flex}.app[data-theme=kids] .modal-header{border-bottom:3px dashed var(--border-light);padding:18px 22px}.modal-header-icon{font-size:28px}.app[data-theme=kids] .modal-header-icon{font-size:36px}.modal-title{font-family:var(--font-titles);color:var(--text-main);margin:0;font-size:18px;font-weight:700}.app[data-theme=kids] .modal-title{color:var(--primary-dark);font-size:22px;font-weight:800}.modal-subtitle{color:var(--text-muted);margin:2px 0 0;font-size:12px;line-height:1.4}.app[data-theme=kids] .modal-subtitle{font-size:13px;font-weight:600}.modal-close-btn{color:var(--text-muted);cursor:pointer;border-radius:var(--radius-sm);transition:all var(--transition-fast);background:0 0;border:none;margin-left:auto;padding:4px 8px;font-size:18px}.modal-close-btn:hover{color:var(--text-main);background:var(--bg-subtle)}.sort-modal-body{flex-direction:column;gap:16px;padding:20px;display:flex}.form-group{flex-direction:column;gap:6px;display:flex}.form-label{font-family:var(--font-titles);color:var(--text-main);font-size:12px;font-weight:700}.app[data-theme=kids] .form-label{font-size:14px;font-weight:800}.form-select,.form-input{font-family:var(--font-body);background:var(--bg-surface);border:1px solid var(--border-light);border-radius:var(--radius-sm);color:var(--text-main);transition:all var(--transition-fast);outline:none;padding:8px 12px;font-size:13px;font-weight:500}.app[data-theme=kids] .form-select,.app[data-theme=kids] .form-input{border:2px solid var(--border-light);border-radius:var(--radius-md);padding:9px 12px;font-size:14px;font-weight:700}.form-select:focus,.form-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px #0284c726}.sort-direction-toggle{grid-template-columns:1fr 1fr;gap:8px;display:grid}.direction-btn{font-family:var(--font-titles);border:1px solid var(--border-light);background:var(--bg-surface);color:var(--text-muted);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);text-align:center;padding:10px;font-size:12px;font-weight:600}.app[data-theme=kids] .direction-btn{border:2px solid var(--border-light);border-radius:var(--radius-md);font-size:13px;font-weight:800}.direction-btn.active{background:var(--bg-subtle);border-color:var(--primary);color:var(--primary);font-weight:700}.app[data-theme=kids] .direction-btn.active{color:#148f4a;background:#e6fcf0;border-color:#27ae60}.form-checkbox-group{margin-top:4px}.checkbox-label{color:var(--text-main);cursor:pointer;align-items:center;gap:8px;font-size:13px;font-weight:500;display:flex}.app[data-theme=kids] .checkbox-label{font-size:14px;font-weight:700}.modal-footer{border-top:1px solid var(--border-light);background:var(--bg-subtle);justify-content:flex-end;align-items:center;gap:10px;padding:14px 20px;display:flex}.app[data-theme=kids] .modal-footer{border-top:3px dashed var(--border-light);padding:16px 22px}.btn-primary{font-family:var(--font-titles);background:var(--primary);color:#fff;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);border:none;padding:9px 18px;font-size:13px;font-weight:700}.app[data-theme=kids] .btn-primary{border-radius:var(--radius-md);background:linear-gradient(135deg,#2ecc71 0%,#27ae60 100%);padding:12px 22px;font-size:15px;font-weight:800;box-shadow:0 4px #1d8a48}.btn-primary:hover:not(:disabled){filter:brightness(1.08);transform:translateY(-1px)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{font-family:var(--font-titles);background:var(--bg-surface);border:1px solid var(--border-light);color:var(--text-muted);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);padding:9px 16px;font-size:13px;font-weight:600}.app[data-theme=kids] .btn-secondary{border:2px solid var(--border-light);border-radius:var(--radius-md);padding:11px 18px;font-size:14px;font-weight:700}.btn-secondary:hover{background:var(--bg-subtle);color:var(--text-main)}.pivot-modal-layout{flex:1;grid-template-columns:290px 1fr;min-height:380px;max-height:520px;display:grid;overflow:hidden}.pivot-sidebar-controls{border-right:1px solid var(--border-light);background:var(--bg-surface);flex-direction:column;gap:12px;padding:18px;display:flex;overflow-y:auto}.app[data-theme=kids] .pivot-sidebar-controls{border-right:3px dashed var(--border-light)}.aggregation-pills{flex-wrap:wrap;gap:4px;display:flex}.agg-pill{font-family:var(--font-mono);background:var(--bg-subtle);border:1px solid var(--border-light);border-radius:var(--radius-sm);color:var(--text-muted);cursor:pointer;transition:all var(--transition-fast);padding:4px 8px;font-size:11px;font-weight:700}.app[data-theme=kids] .agg-pill{font-family:var(--font-titles);border-radius:var(--radius-md);font-size:12px;font-weight:800}.agg-pill.active{background:var(--primary);border-color:var(--primary);color:#fff}.pivot-preview-container{background:var(--bg-subtle);flex-direction:column;gap:12px;padding:18px;display:flex;overflow:auto}.pivot-preview-header{justify-content:space-between;align-items:center;gap:8px;display:flex}.pivot-preview-badge{font-family:var(--font-titles);text-transform:uppercase;letter-spacing:.5px;border-radius:var(--radius-sm);color:#10b981;background:#10b98126;padding:3px 8px;font-size:11px;font-weight:800}.pivot-preview-summary{color:var(--text-muted);font-size:12px}.pivot-table-wrap{background:var(--bg-surface);border:1px solid var(--border-dark);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);overflow:auto}.app[data-theme=kids] .pivot-table-wrap{border:2px solid var(--border-light)}.pivot-grid-table{border-collapse:collapse;text-align:left;width:100%;font-size:13px}.pivot-th-corner{background:var(--grid-header-bg);color:var(--grid-header-color);font-family:var(--font-titles);border-bottom:2px solid var(--border-dark);border-right:1px solid var(--grid-cell-border);padding:8px 12px;font-weight:700}.pivot-th{background:var(--grid-header-bg);color:var(--grid-header-color);font-family:var(--font-titles);text-align:right;border-bottom:2px solid var(--border-dark);border-right:1px solid var(--grid-cell-border);padding:8px 12px;font-weight:700}.pivot-th-total{background:var(--grid-header-active-bg);color:var(--grid-header-active-color);font-family:var(--font-titles);text-align:right;border-bottom:2px solid var(--border-dark);padding:8px 12px;font-weight:800}.pivot-td-label{font-family:var(--font-titles);color:var(--text-main);border-bottom:1px solid var(--grid-cell-border);border-right:1px solid var(--grid-cell-border);background:var(--bg-surface);padding:8px 12px;font-weight:600}.pivot-td-val{font-family:var(--font-mono);text-align:right;color:var(--text-main);border-bottom:1px solid var(--grid-cell-border);border-right:1px solid var(--grid-cell-border);padding:8px 12px;font-weight:500}.pivot-td-total{font-family:var(--font-mono);text-align:right;color:var(--primary);background:var(--bg-subtle);border-bottom:1px solid var(--grid-cell-border);padding:8px 12px;font-weight:700}.pivot-tfoot-row td{border-top:2px solid var(--border-dark);border-bottom:none;font-weight:700}.pivot-td-grand-total{font-family:var(--font-mono);text-align:right;color:#fff;background:var(--primary);padding:8px 12px;font-weight:800}.app[data-theme=kids] .pivot-td-grand-total{background:#27ae60}.pivot-empty-state{text-align:center;color:var(--text-muted);flex-direction:column;justify-content:center;align-items:center;gap:8px;padding:40px 20px;display:flex}.pivot-empty-state .empty-icon{font-size:38px}.completed-badge-pill{font-family:var(--font-titles);color:#10b981;border-radius:var(--border-radius-pill);background:#10b98126;border:1px solid #10b98166;align-items:center;gap:4px;padding:2px 8px;font-size:11px;font-weight:800;display:inline-flex}.app[data-theme=kids] .completed-badge-pill{color:#148f4a;background:#e6fcf0;border:2px solid #27ae60;font-size:13px}.step-pass-tag{font-family:var(--font-titles);color:#10b981;border-radius:var(--radius-sm);background:#10b9811f;margin-left:auto;padding:2px 8px;font-size:11px;font-weight:800;display:inline-block}.app[data-theme=kids] .step-pass-tag{color:#155724;background:#d4edda;font-size:13px}.result-alert-pass-wrap{align-items:center;gap:10px;display:flex}.pass-icon-check{color:#10b981;font-size:20px;font-weight:900}.app[data-theme=kids] .pass-icon-check{color:#27ae60;font-size:24px}.certificate-badge-btn{font-family:var(--font-titles);color:var(--text-main);background:var(--bg-surface);border:1px solid var(--border-light);border-radius:var(--border-radius-pill);cursor:pointer;transition:all var(--transition-fast);align-items:center;gap:6px;padding:6px 14px;font-size:12px;font-weight:700;display:inline-flex}.certificate-badge-btn:hover{background:var(--bg-subtle);border-color:#f59e0b;transform:translateY(-1px)}.certificate-badge-btn.locked-badge-btn{opacity:.85;color:var(--text-muted)}.certificate-badge-btn.locked-badge-btn:hover{border-color:var(--secondary);color:var(--text-main)}.certificate-badge-btn.completed-glow{color:#92400e;background:linear-gradient(135deg,#fef3c7 0%,#fde68a 100%);border-color:#f59e0b;animation:2s infinite pulse-glow;box-shadow:0 0 12px #f59e0b66}.app[data-theme=kids] .certificate-badge-btn{border:2px solid #ffd93d;padding:6px 16px;font-size:14px}.btn-claim-cert{color:#fff!important;background:linear-gradient(135deg,#f59e0b 0%,#d97706 100%)!important;font-size:16px!important;box-shadow:0 4px #b45309!important}.locked-cert-modal{background:var(--bg-surface)!important;max-width:520px!important}.locked-cert-body{text-align:center;flex-direction:column;align-items:center;padding:24px;display:flex}.locked-shield-icon{margin-bottom:12px;font-size:48px;position:relative}.lock-sub-icon{font-size:24px;position:absolute;bottom:-4px;right:-8px}.locked-progress-title{font-family:var(--font-titles);color:var(--text-main);margin:0 0 14px;font-size:18px;font-weight:800}.cert-progress-bar-wrap{background:var(--bg-app);border:1px solid var(--border-light);border-radius:999px;width:100%;height:12px;margin-bottom:8px;overflow:hidden}.app[data-theme=kids] .cert-progress-bar-wrap{border:2px solid var(--border-dark);height:16px}.cert-progress-bar-fill{background:linear-gradient(90deg,#38bdf8 0%,#10b981 100%);border-radius:999px;height:100%;transition:width .4s}.app[data-theme=kids] .cert-progress-bar-fill{background:linear-gradient(90deg,#ffd93d 0%,#2ecc71 100%)}.cert-progress-percent{font-family:var(--font-titles);color:var(--secondary);margin-bottom:14px;font-size:13px;font-weight:700}.locked-guidance-text{color:var(--text-muted);margin:0;font-size:13.5px;line-height:1.5}.certificate-modal-backdrop{z-index:1200}.certificate-modal-wrapper{border-radius:var(--radius-lg);background:#1e293b;width:100%;max-width:920px;max-height:95vh;overflow:hidden}.certificate-controls-bar{background:#0f172a;border-bottom:1px solid #334155;justify-content:space-between;align-items:center;gap:16px;padding:12px 24px;display:flex}.name-input-group{align-items:center;gap:10px;display:flex}.name-label{font-family:var(--font-titles);color:#94a3b8;font-size:13px;font-weight:700}.name-input-field{font-family:var(--font-titles);border-radius:var(--radius-sm);color:#f8fafc;background:#1e293b;border:1px solid #475569;outline:none;width:240px;padding:6px 14px;font-size:14px;font-weight:700}.name-input-field:focus{border-color:#38bdf8;box-shadow:0 0 0 3px #38bdf833}.certificate-actions{align-items:center;gap:10px;display:flex}.btn-print-certificate{font-family:var(--font-titles);color:#fff;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);background:linear-gradient(135deg,#10b981 0%,#059669 100%);border:none;padding:8px 18px;font-size:13px;font-weight:800;box-shadow:0 2px 4px #0003}.btn-print-certificate:hover{filter:brightness(1.1);transform:translateY(-1px)}.btn-close-certificate{font-family:var(--font-titles);color:#cbd5e1;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);background:#334155;border:none;padding:8px 14px;font-size:13px;font-weight:600}.btn-close-certificate:hover{color:#fff;background:#475569}.certificate-print-zone{background:#0f172a;justify-content:center;padding:24px;display:flex;overflow:auto}.certificate-card-document{color:#0f172a;box-sizing:border-box;background:#fff;width:820px;min-height:540px;padding:16px;position:relative;box-shadow:0 10px 25px #0000004d}.cert-border-outer{box-sizing:border-box;border:4px solid #1e3a8a;width:100%;height:100%;padding:8px}.cert-border-inner{text-align:center;box-sizing:border-box;background:radial-gradient(circle,#fff 60%,#fffbeb 100%);border:2px dashed #b45309;flex-direction:column;align-items:center;width:100%;height:100%;padding:28px 36px;display:flex}.kids-cert .cert-border-outer{border:6px solid #ff6b6b;border-radius:20px}.kids-cert .cert-border-inner{background:radial-gradient(circle,#fff 50%,#fef9c3 100%);border:3px solid #ffd93d;border-radius:14px}.cert-header{margin-bottom:12px}.cert-emblem-badge{margin-bottom:6px;font-size:42px;line-height:1}.cert-main-title{letter-spacing:2px;color:#1e3a8a;margin:0;font-family:Georgia,Playfair Display,serif;font-size:26px;font-weight:900}.kids-cert .cert-main-title{font-family:var(--font-titles);color:#b45309;font-size:28px}.cert-subtitle{color:#64748b;margin:6px 0 0;font-family:Georgia,serif;font-size:15px;font-style:italic}.cert-recipient-section{flex-direction:column;align-items:center;width:100%;margin:12px 0;display:flex}.cert-recipient-name{color:#0f172a;letter-spacing:1px;margin:0 0 4px;font-family:Georgia,Playfair Display,serif;font-size:32px;font-weight:800}.kids-cert .cert-recipient-name{font-family:var(--font-titles);color:#1e3a8a;font-size:36px}.cert-underline{background:linear-gradient(90deg,#0000,#b45309,#0000);width:60%;height:2px}.cert-body-text{max-width:620px;margin:6px 0 16px}.cert-statement{color:#334155;margin:0 0 10px;font-size:13px;line-height:1.5}.cert-rank-ribbon{color:#fff;font-family:var(--font-titles);letter-spacing:.5px;background:linear-gradient(135deg,#1e3a8a 0%,#1e40af 100%);border-radius:999px;margin-bottom:12px;padding:5px 22px;font-size:13px;font-weight:800;display:inline-block;box-shadow:0 2px 6px #1e3a8a4d}.kids-cert .cert-rank-ribbon{background:linear-gradient(135deg,#f59e0b 0%,#d97706 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#475569;width:100%;margin-bottom:4px;padding-bottom:4px;font-size:14px;font-weight:700}.cert-gold-seal{background:radial-gradient(circle,#fde047 0%,#d97706 100%);border:3px solid #b45309;border-radius:50%;justify-content:center;align-items:center;width:72px;height:72px;margin-bottom:4px;display:flex;box-shadow:0 4px 8px #b4530959}.seal-inner{color:#78350f;border:1px dashed #78350f;border-radius:50%;flex-direction:column;justify-content:center;align-items:center;width:58px;height:58px;display:flex}.seal-stars{letter-spacing:1px;font-size:9px}.seal-text{font-family:var(--font-titles);letter-spacing:.8px;font-size:8px;font-weight:900}.seal-score{font-family:var(--font-mono);font-size:8px;font-weight:800}@media print{@page{size:landscape;margin:0}body,html{-webkit-print-color-adjust:exact!important;print-color-adjust:exact!important;background:#fff!important;margin:0!important;padding:0!important}.no-print,.app-header,.app-body,.adsense-container,.celebration-overlay,.certificate-controls-bar,.modal-backdrop:not(.certificate-modal-backdrop){display:none!important}.modal-backdrop.certificate-modal-backdrop{background:0 0!important;padding:0!important;display:block!important;position:static!important;inset:auto!important}.certificate-modal-wrapper{box-shadow:none!important;background:0 0!important;border:none!important;width:100vw!important;max-width:100%!important;height:100vh!important;max-height:100%!important}.certificate-print-zone{background:0 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button:disabled{opacity:.5;cursor:default}.lesson-panel :focus-visible{outline:3px solid var(--primary);outline-offset:3px}.formula-bar-container{flex-wrap:wrap;gap:8px}.formula-input-field{min-width:150px;min-height:40px;font-size:15px}@media (width<=700px){.lesson-panel{width:44vw;min-width:240px;max-width:44vw}.lesson-picker,.lesson-content,.lesson-action{padding:12px}.lesson-heading h2,.lesson-action h3{font-size:17px}.lesson-formula code{font-size:16px}}.lesson-footer{border-top:1px solid var(--border-light);background:var(--bg-sidebar);flex-shrink:0;padding:12px 20px}.lesson-footer .lesson-check{margin:0}.lesson-footer p{margin:7px 0 0}.lesson-footer .result-alert{max-height:110px;margin:0 0 10px;font-size:13px;overflow-y:auto}@media (height<=800px){.lesson-picker{padding:12px 16px}.lesson-position{margin-bottom:6px}.lesson-content{padding:14px}.lesson-heading{margin-bottom:12px}.lesson-heading h2{margin-bottom:8px;font-size:18px}.lesson-action{padding:12px}.lesson-action h3{font-size:18px}.lesson-action p{margin:8px 0}.lesson-action-label{margin-bottom:8px}}.app[data-theme=adult-light]{--ui-page:#fbfbfa;--ui-panel:#fff;--ui-soft:#faf9f5;--ui-line:#eae8e3;--ui-text:#1c1917;--ui-muted:#57534e;--ui-accent:#1e2022;--ui-link:#047857;--ui-grid:#fff;--ui-grid-line:#e5e5df;--ui-grid-head:#f8f7f4;--ui-green:#15803d;--ui-green-soft:#f0fdf4;--ui-shadow:0 1px 3px #00000008}.app[data-theme=adult-dark]{--ui-page:#0b0f19;--ui-panel:#111827;--ui-soft:#0b1120;--ui-line:#273449;--ui-text:#f1f5f9;--ui-muted:#aab6c8;--ui-accent:#6366f1;--ui-link:#a5b4fc;--ui-grid:#0b1120;--ui-grid-line:#1e293b;--ui-grid-head:#1e293b;--ui-green:#34d399;--ui-green-soft:#06392e;--ui-shadow:0 8px 24px #00000020}.app{background:var(--ui-page)}.app-body{gap:16px;padding:16px}.app-header{background:var(--ui-panel);border-color:var(--ui-line);height:58px;color:var(--ui-text);flex-shrink:0;box-shadow:0 1px 3px #00000008}.app-header .brand-logo{width:36px;height:36px}.app-header .brand-titles{flex-direction:row;align-items:center;gap:12px}.app-header .app-title{letter-spacing:-.5px;font-size:18px}.app-header .rank-badge{white-space:nowrap;font-size:10px}.app-header .theme-switcher{border:1px solid var(--ui-line);background:var(--ui-soft)}.app-header .theme-btn{color:var(--ui-muted);font-size:12px}.app-header .theme-btn.active{background:var(--ui-accent);color:#fff}.app-header .stat-pill{border-radius:7px;font-size:12px}.app[data-theme=adult-light] .app-header .xp-pill,.app[data-theme=adult-light] .app-header .certificate-badge-btn{color:#92400e;background:#fffbeb;border-color:#fde68a}.app[data-theme=adult-light] .app-header .progress-pill{color:#44403c;background:#f5f4ef;border-color:#e2e0d8}.app[data-theme=adult-dark] .app-header .xp-pill,.app[data-theme=adult-dark] .app-header .certificate-badge-btn{color:#fcd34d;background:#332410;border-color:#70531e}.app[data-theme=adult-dark] .app-header .progress-pill{color:#fda4af;background:#351823;border-color:#703046}.lesson-panel{--primary:var(--ui-link);--bg-sidebar:var(--ui-panel);--bg-surface:var(--ui-panel);--bg-subtle:var(--ui-soft);--text-main:var(--ui-text);--text-muted:var(--ui-muted);--border-light:var(--ui-line);background:var(--ui-panel);color:var(--ui-text);border:1px solid var(--ui-line);box-shadow:var(--ui-shadow);border-radius:12px;width:390px}.lesson-picker{background:var(--ui-panel)}.lesson-picker select{background:var(--ui-soft);border-radius:7px;font-weight:500}.lesson-position strong{color:var(--ui-text)}.lesson-position>span{background:var(--ui-accent);color:#fff;border-radius:20px;padding:3px 8px;font-size:10px}.lesson-heading h2{letter-spacing:-.4px}.lesson-round-track{background:var(--ui-soft);border:1px solid var(--ui-line);border-radius:9px;align-items:center;gap:7px;margin-top:8px;padding:6px;display:flex}.lesson-round-track>:not(.lesson-round-arrow){flex:1;min-width:0;font-size:12px;line-height:1.5}.lesson-round-current{color:var(--ui-link);flex-wrap:wrap;align-items:center;gap:5px;padding:7px;display:flex}.lesson-round-current strong{font-weight:650}.lesson-round-current small{background:var(--ui-green-soft);color:var(--ui-green);text-transform:uppercase;letter-spacing:.04em;border-radius:4px;padding:2px 5px;font-size:9px;font-weight:700}.lesson-round-upcoming,.lesson-round-arrow{color:var(--ui-muted)}.lesson-round-track button{border:1px solid var(--ui-line);background:var(--ui-panel);min-height:40px;color:var(--ui-link);text-align:left;cursor:pointer;text-underline-offset:3px;border-radius:6px;padding:7px;text-decoration:underline}.lesson-round-track button:hover{border-color:var(--ui-link)}.lesson-round-track button:focus-visible{outline:2px solid var(--ui-link);outline-offset:2px}.lesson-round-note{color:var(--ui-muted);margin:6px 0 0;font-size:12px;line-height:1.5}.lesson-action{background:var(--ui-soft);border-color:var(--ui-line);box-shadow:inset 0 1px 3px #00000004}.lesson-action-label{color:var(--ui-muted);letter-spacing:.04em;font-size:10px}.lesson-action h3{color:var(--ui-text)}.lesson-why{color:var(--ui-muted)}.lesson-formula{background:var(--ui-panel);border:1px solid var(--ui-line);border-left:3px solid var(--ui-green);border-radius:8px}.lesson-formula code{color:var(--ui-text)}.lesson-panel .lesson-check{background:var(--ui-panel);color:var(--ui-link);border-color:var(--ui-link);border-radius:7px}.lesson-panel .lesson-check:hover{background:var(--ui-soft)}.lesson-target{color:var(--ui-green);background:var(--ui-green-soft);border:1px solid var(--ui-green);font-family:var(--font-mono);border-radius:5px;margin-bottom:12px;padding:3px 8px;font-size:12px;display:inline-block}.app-main{border:1px solid var(--ui-line);box-shadow:var(--ui-shadow);background:var(--ui-panel);border-radius:12px}.trainer-intro{border-bottom:1px solid var(--ui-line);background:var(--ui-soft);color:var(--ui-text);flex-shrink:0;justify-content:space-between;align-items:center;gap:16px;padding:9px 14px;display:flex}.trainer-intro h2{margin:0 0 2px;font-size:15px;font-weight:700;line-height:1.25}.trainer-intro p{color:var(--ui-muted);margin:0;font-size:12px;line-height:1.4}.trainer-intro a{color:var(--ui-link);text-underline-offset:3px;flex-shrink:0;font-size:12px;font-weight:700}@media (width<=800px){.trainer-intro{flex-direction:column;align-items:flex-start;gap:4px}}.formula-bar-container{--primary:var(--ui-link);--bg-surface:var(--ui-panel);--border-light:var(--ui-line);--text-main:var(--ui-text);background:var(--ui-panel);border-color:var(--ui-line);padding:10px}.formula-bar-container .cell-reference-box,.formula-bar-container .fx-button{background:var(--ui-soft);border:1px solid var(--ui-line);color:var(--ui-link);border-radius:6px}.formula-bar-container .formula-input-field{background:var(--ui-grid);color:var(--ui-text);border-color:var(--ui-line);box-shadow:inset 0 1px 2px #00000005}.formula-bar-container .tool-action-btn{background:var(--ui-grid-head);border:1px solid var(--ui-line);color:var(--ui-text);border-radius:6px}.app-spreadsheet-wrap{--grid-header-bg:var(--ui-grid-head);--grid-header-color:var(--ui-muted);--grid-header-active-bg:var(--ui-green-soft);--grid-header-active-color:var(--ui-green);--grid-cell-bg:var(--ui-grid);--grid-cell-border:var(--ui-grid-line);--grid-cell-selected-bg:var(--ui-green-soft);--grid-cell-selected-border:var(--ui-green);--grid-target-pulse:var(--ui-green);--border-light:var(--ui-grid-line);--text-main:var(--ui-text);background:var(--ui-grid);padding:0}.app-spreadsheet-wrap .spreadsheet-container{border:0;border-radius:0}.app-spreadsheet-wrap .grid-col-header,.app-spreadsheet-wrap .grid-row-header{font-size:11px}.sheet-status{color:var(--ui-muted);background:var(--ui-panel);border-top:1px solid var(--ui-line);flex-shrink:0;justify-content:space-between;align-items:center;gap:12px;padding:6px 12px;font-size:11px;display:flex}.sheet-status strong{color:var(--ui-green);border-top:2px solid var(--ui-green);background:var(--ui-soft);border-radius:4px 4px 0 0;padding:5px 12px}.lesson-content,.app-spreadsheet-wrap{scrollbar-width:thin;scrollbar-color:var(--ui-line) var(--ui-panel)}@media (width<=1150px){.app-header .brand-titles{flex-direction:column;align-items:flex-start;gap:2px}.lesson-panel{width:350px}.app-body{gap:12px;padding:12px}}@media (width<=800px){.app-header{flex-wrap:wrap;gap:10px;height:auto;min-height:58px;padding:10px 12px}.app-body{flex-direction:column;overflow:auto}.lesson-panel{width:100%;min-width:0;max-width:none;max-height:55dvh}.app-main{flex:none;width:100%;height:65dvh;min-height:540px}.lesson-content{min-height:180px}.lesson-picker{padding:10px 14px}}.app[data-theme] .app-header .theme-btn.active{background:var(--ui-accent);color:#fff}.app[data-theme] .app-header .app-title,.lesson-panel .lesson-heading h2{color:var(--ui-text)}.lesson-panel{width:520px}.lesson-content{flex:1;padding:14px 16px}.module-picker{margin-bottom:8px}.module-picker-title{border-bottom:1px solid var(--ui-line);justify-content:space-between;align-items:center;gap:12px;padding-bottom:6px;display:flex}.module-picker-title h2{letter-spacing:-.4px;margin:0;font-size:15px}.module-picker-title h2>span{margin-right:8px}.module-picker-title>span{color:#fff;background:var(--ui-accent);border-radius:20px;flex-shrink:0;padding:2px 10px;font-size:12px;font-weight:700}.module-cards{scrollbar-width:thin;scrollbar-color:var(--ui-line) transparent;align-items:flex-start;gap:8px;padding:8px 0 4px;display:flex;position:relative;overflow-x:auto}.module-card{text-align:left;border:1px solid var(--ui-line);background:var(--ui-panel);min-width:190px;color:var(--ui-muted);cursor:pointer;font:inherit;border-radius:10px;flex:none;align-items:center;gap:8px;padding:7px;display:flex}.module-card[aria-current=true]{border-color:var(--ui-accent);background:var(--ui-soft);color:var(--ui-text)}.module-card:hover{border-color:var(--ui-link)}.module-icon{border:1px solid var(--ui-line);background:var(--ui-panel);border-radius:6px;flex-shrink:0;place-items:center;width:28px;height:28px;font-size:15px;display:grid}.module-card-copy{white-space:nowrap;gap:3px;min-width:0;display:grid}.module-card-copy>strong{font-size:13px;line-height:1.35}.module-card-copy>span{align-items:center;gap:7px;display:flex}.module-card-copy small{border:1px solid var(--ui-line);background:var(--ui-soft);text-transform:uppercase;border-radius:3px;padding:3px 5px;font-size:10px;font-weight:700}.module-card-copy b{color:#b45309;font-size:11px}.app[data-theme=adult-dark] .module-card-copy b{color:#fbbf24}.module-navigation{border-bottom:1px solid var(--ui-line);justify-content:space-between;align-items:center;gap:8px;padding:6px 0 4px;display:flex}.module-navigation>span{color:var(--ui-muted);font-size:12px}.module-navigation button{border:1px solid var(--ui-line);background:var(--ui-soft);color:var(--ui-text);font:inherit;cursor:pointer;border-radius:5px;flex-shrink:0;padding:5px 9px;font-size:12px}.module-navigation button:disabled{opacity:.45;cursor:default}.module-heading{align-items:center;gap:10px;display:flex}.module-heading .module-icon{background:var(--ui-green-soft);border-color:var(--ui-line);border-radius:10px;width:32px;height:32px}.lesson-panel .module-heading h2{margin:0;font-size:17px}.module-heading p{color:var(--ui-muted);margin:2px 0 0;font-size:12px}.module-description{color:var(--ui-muted);margin:8px 0;font-size:13px;line-height:1.5}.module-restart{color:var(--ui-link);font:inherit;text-underline-offset:2px;cursor:pointer;background:0 0;border:0;padding:4px 0;font-size:13px;font-weight:600;text-decoration:underline}.lesson-panel .lesson-heading{margin-bottom:10px}.module-step-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px;display:flex}.module-step-header .lesson-action-label{text-transform:uppercase;margin:0;font-size:11px}.module-step-progress{flex-wrap:wrap;gap:5px;display:flex}.module-step-progress>*{border:1px solid var(--ui-line);min-width:26px;height:26px;color:var(--ui-muted);background:var(--ui-panel);font:inherit;border-radius:7px;place-items:center;padding:3px;font-size:12px;display:grid}.module-step-progress>[aria-current=step]{background:var(--ui-accent);color:#fff;border-color:var(--ui-accent)}.module-step-progress button{cursor:pointer}.lesson-round-current{padding:5px}.lesson-round-track{margin-top:6px}.lesson-round-track button{min-height:34px;padding:6px}.lesson-round-note{margin:5px 0 0}.lesson-panel .lesson-action{padding:12px}.lesson-panel .lesson-action h3{margin:0 0 8px;font-size:17px;line-height:1.35}.lesson-panel .lesson-action p,.lesson-panel .lesson-details p{margin:8px 0;font-size:13px;line-height:1.5}.lesson-panel .lesson-formula{gap:6px;margin:8px 0;padding:10px}.lesson-panel .lesson-formula code{font-size:16px;line-height:1.45}.lesson-panel .lesson-formula span{font-size:11px}.lesson-panel .lesson-details{margin-top:10px;padding-bottom:10px}.lesson-panel .lesson-details summary{padding:4px 0;font-size:12px}@media (width<=1150px){.lesson-panel{width:390px}}@media (width<=800px){.lesson-panel{width:100%}.lesson-content{padding:16px}}.app{height:auto;min-height:100vh;overflow:visible}.app-screen{flex-direction:column;height:100dvh;display:flex}