:root{--bg-primary: #0a0a0a;--bg-secondary: #111111;--bg-card: #161616;--bg-card-hover: #1a1a1a;--bg-elevated: #1e1e1e;--bg-input: #141414;--border-subtle: #1f1f1f;--border-default: #272727;--border-strong: #333333;--border-focus: #555555;--text-primary: #ebebeb;--text-secondary: #a0a0a0;--text-tertiary: #666666;--text-muted: #444444;--accent: #ffffff;--accent-muted: rgba(255, 255, 255, .08);--accent-hover: rgba(255, 255, 255, .12);--grade-fail: #ff4444;--grade-hard: #ff8c00;--grade-good: #888888;--grade-easy: #44cc44;--space-xs: 4px;--space-sm: 8px;--space-md: 12px;--space-lg: 16px;--space-xl: 24px;--space-2xl: 32px;--space-3xl: 48px;--space-4xl: 64px;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-xs: 11px;--font-sm: 12px;--font-md: 13px;--font-lg: 14px;--font-xl: 16px;--font-2xl: 20px;--font-3xl: 28px;--radius-sm: 6px;--radius-md: 8px;--radius-lg: 12px;--transition-fast: .12s ease;--transition-default: .2s ease;--transition-slow: .35s cubic-bezier(.4, 0, .2, 1);--logo-inverse: #0a0a0a}[data-theme=light]{--bg-primary: #ffffff;--bg-secondary: #f8f8f8;--bg-card: #f5f5f5;--bg-card-hover: #efefef;--bg-elevated: #eaeaea;--bg-input: #f0f0f0;--border-subtle: #e8e8e8;--border-default: #d8d8d8;--border-strong: #c0c0c0;--border-focus: #999999;--text-primary: #1a1a1a;--text-secondary: #555555;--text-tertiary: #888888;--text-muted: #bbbbbb;--accent: #1a1a1a;--accent-muted: rgba(0, 0, 0, .06);--accent-hover: rgba(0, 0, 0, .1);--grade-fail: #dc3030;--grade-hard: #e07800;--grade-good: #777777;--grade-easy: #2da82d;--logo-inverse: #ffffff}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;width:100%;overflow:hidden}body{font-family:var(--font-family);font-size:var(--font-md);color:var(--text-primary);background:var(--bg-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.5;transition:background .3s ease,color .3s 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var(--transition-fast)}.stat-card:hover{border-color:var(--border-default)}.stat-label{font-size:var(--font-xs);font-weight:500;color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.8px;margin-bottom:var(--space-sm)}.stat-value{font-size:var(--font-2xl);font-weight:700;color:var(--text-primary);letter-spacing:-.5px}.stat-value.highlight{color:var(--accent)}.action-button{display:flex;align-items:center;justify-content:center;gap:var(--space-sm);width:100%;padding:var(--space-lg) var(--space-xl);background:var(--text-primary);color:var(--bg-primary);border:none;border-radius:var(--radius-md);font-family:var(--font-family);font-size:var(--font-lg);font-weight:600;cursor:pointer;transition:all var(--transition-default);letter-spacing:-.2px;margin-bottom:var(--space-3xl)}.action-button:hover{opacity:.9;transform:translateY(-1px)}.action-button:active{transform:translateY(0);opacity:.8}.action-button:disabled{opacity:.3;cursor:not-allowed;transform:none}.action-button.secondary{background:var(--bg-card);color:var(--text-primary);border:1px solid var(--border-default)}.action-button.secondary:hover{background:var(--bg-card-hover);border-color:var(--border-strong)}.io-row{display:flex;gap:var(--space-sm);margin-bottom:var(--space-xl)}.io-btn{display:flex;align-items:center;gap:var(--space-xs);padding:var(--space-sm) var(--space-md);background:none;border:1px solid var(--border-default);border-radius:var(--radius-sm);color:var(--text-secondary);font-family:var(--font-family);font-size:var(--font-sm);font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.io-btn:hover{color:var(--text-primary);border-color:var(--border-strong);background:var(--accent-muted)}.study-controls{display:flex;flex-direction:column;gap:var(--space-md);align-items:flex-start;margin-bottom:var(--space-xl)}.study-filter-toggles{display:flex;gap:2px;background:var(--bg-card);padding:3px;border:1px solid var(--border-default);border-radius:var(--radius-md)}.filter-toggle{background:transparent;border:none;padding:6px 12px;border-radius:var(--radius-sm);font-family:var(--font-family);font-size:var(--font-xs);font-weight:600;color:var(--text-muted);cursor:pointer;transition:all var(--transition-fast);display:flex;align-items:center;gap:6px}.filter-toggle:hover:not(:disabled){color:var(--text-secondary);background:var(--bg-card-hover)}.filter-toggle.active{background:var(--bg-elevated);color:var(--text-primary);box-shadow:0 1px 2px #0000001a;border:1px solid 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var(--transition-fast);outline:none}.form-input:focus{border-color:var(--border-focus)}.form-input::placeholder{color:var(--text-muted)}textarea.form-input{min-height:100px;resize:vertical;line-height:1.6}textarea.form-input.auto-resize{overflow:hidden;resize:none}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-md)}.form-select{width:100%;padding:var(--space-md) var(--space-lg);background:var(--bg-input);border:1px solid var(--border-default);border-radius:var(--radius-md);color:var(--text-primary);font-family:var(--font-family);font-size:var(--font-md);cursor:pointer;outline:none;appearance:none;transition:border-color var(--transition-fast)}.form-select:focus{border-color:var(--border-focus)}.prompts-list{display:flex;flex-direction:column;gap:var(--space-sm)}.prompt-row{display:flex;gap:var(--space-sm);align-items:center}.prompt-row .form-input{flex:1}.prompt-remove-btn{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border:1px 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var(--border-strong);border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:var(--space-xl);color:var(--text-secondary);font-size:24px}.complete-title{font-size:var(--font-2xl);font-weight:700;color:var(--text-primary);letter-spacing:-.5px;margin-bottom:var(--space-sm)}.complete-desc{font-size:var(--font-md);color:var(--text-tertiary);margin-bottom:var(--space-3xl)}.toast{position:fixed;bottom:var(--space-xl);left:50%;transform:translate(-50%) translateY(20px);padding:var(--space-md) var(--space-xl);background:var(--bg-elevated);border:1px solid var(--border-default);border-radius:var(--radius-md);color:var(--text-primary);font-size:var(--font-sm);font-weight:500;animation:toastIn .3s ease forwards;z-index:100;pointer-events:none}@keyframes toastIn{0%{opacity:0;transform:translate(-50%) translateY(20px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.toast.out{animation:toastOut .3s ease forwards}@keyframes toastOut{0%{opacity:1;transform:translate(-50%) translateY(0)}to{opacity:0;transform:translate(-50%) translateY(20px)}}.card-type-toggles{display:flex;gap:var(--space-sm)}.card-type-toggle{display:flex;align-items:center;gap:var(--space-sm);padding:var(--space-md) var(--space-lg);border:1px solid var(--border-default);border-radius:var(--radius-md);background:var(--bg-input);cursor:pointer;transition:all var(--transition-fast);font-size:var(--font-sm);font-weight:500;color:var(--text-tertiary);-webkit-user-select:none;user-select:none;flex:1}.card-type-toggle input[type=checkbox]{display:none}.card-type-toggle .toggle-icon{display:flex;align-items:center;justify-content:center;opacity:.5;transition:opacity var(--transition-fast)}.card-type-toggle:hover{border-color:var(--border-strong);color:var(--text-secondary)}.card-type-toggle.active{border-color:var(--border-focus);background:var(--accent-muted);color:var(--text-primary)}.card-type-toggle.active 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.hint-step-remove{opacity:1}.hint-step-remove:hover{color:var(--grade-fail);background:#ff44441a}.hint-arrow{display:flex;align-items:center;justify-content:center;color:var(--text-muted);flex-shrink:0}.hint-add-step{width:32px;height:32px;display:flex;align-items:center;justify-content:center;border:1px dashed var(--border-default);background:none;color:var(--text-muted);font-size:16px;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);flex-shrink:0}.hint-add-step:hover{border-color:var(--border-strong);color:var(--text-secondary)}.hint-preview{margin-top:var(--space-sm);font-size:var(--font-xs);color:var(--text-muted)}.hint-preview span{color:var(--text-secondary);font-weight:500}.form-info{padding:var(--space-md) var(--space-lg);background:var(--accent-muted);border:1px solid var(--border-subtle);border-radius:var(--radius-md);font-size:var(--font-sm);color:var(--text-secondary);margin-bottom:var(--space-xl);animation:fadeInUp .2s ease}.kbd-hint{display:inline-flex;align-items:center;justify-content:center;padding:1px 5px;margin-left:var(--space-sm);font-size:9px;font-weight:600;letter-spacing:.5px;text-transform:uppercase;background:#ffffff0f;border:1px solid rgba(255,255,255,.1);border-radius:3px;color:inherit;opacity:.4;line-height:1.4}.study-btn .kbd-hint{background:#00000026;border-color:#0003}.session-summary{display:flex;flex-direction:column;gap:var(--space-sm);padding:var(--space-lg) var(--space-xl);background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-md);min-width:180px;margin-bottom:var(--space-xl)}.summary-row{display:flex;align-items:center;gap:var(--space-sm);font-size:var(--font-sm)}.summary-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.summary-dot.fail{background:var(--grade-fail)}.summary-dot.hard{background:var(--grade-hard)}.summary-dot.good{background:var(--text-tertiary)}.summary-dot.easy{background:var(--grade-easy)}.summary-label{color:var(--text-secondary);flex:1}.summary-count{font-weight:600;color:var(--text-primary)}.study-cloze{animation:fadeInUp .3s ease;margin-top:var(--space-xl);text-align:left}.cloze-text{line-height:1.8;white-space:pre-wrap}.cloze-blurred{filter:blur(5px);-webkit-user-select:none;user-select:none;opacity:.6;background:var(--accent-muted);border-radius:4px;padding:0 4px;transition:filter .2s ease;display:inline-block;pointer-events:none}li.cloze-blank{list-style:none;padding-left:0}li.cloze-blank .cloze-blurred{display:block;padding:var(--space-sm) var(--space-md)}[data-theme=light] .grade-btn.fail:hover{background:#dc303014;border-color:#dc30304d}[data-theme=light] .grade-btn.hard:hover{background:#e0780014;border-color:#e078004d}[data-theme=light] .grade-btn.easy:hover{background:#2da82d14;border-color:#2da82d4d}[data-theme=light] .card-delete-btn:hover{background:#dc303014}[data-theme=light] .kbd-hint{background:#0000000a;border-color:#0000001f}[data-theme=light] .study-btn.primary .kbd-hint{background:#fff3;border-color:#ffffff4d}@media(max-width:768px){:root{--space-3xl: 20px;--space-4xl: 24px;--font-3xl: 24px;--font-2xl: 18px}html,body,#root,.app{height:100dvh;overflow:hidden}.nav{flex-direction:column;gap:16px;padding:16px;height:auto;flex-shrink:0;background:var(--bg-primary);z-index:50}.nav-brand{justify-content:center;margin-bottom:4px}.nav-links{width:100%;justify-content:space-between;padding:4px;background:var(--bg-card);border-radius:99px;box-shadow:0 2px 8px #0003}.nav-link{flex:1;text-align:center;padding:10px 0;font-size:13px;border-radius:99px}.theme-toggle{width:44px;height:100%;justify-content:center;border-left:1px solid var(--border-subtle);margin-left:4px;border-radius:50%}.main-content{padding:24px 16px 140px;overflow-y:auto;-webkit-overflow-scrolling:touch}.dashboard{display:flex;flex-direction:column;gap:24px}.dashboard-header{text-align:center;margin-bottom:0;padding:0 8px;order:1}.dashboard-greeting{font-size:10px;opacity:.6;margin-bottom:4px}.dashboard-title{font-size:32px;margin:0;line-height:1.1}.dashboard-subtitle{font-size:14px;margin-top:8px;opacity:.8}.stats-row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px;margin-bottom:0;order:2}.stat-card{flex-direction:column;align-items:center;justify-content:center;padding:16px 8px;background:var(--bg-elevated);text-align:center;border:none;border-radius:16px}.stat-label{font-size:9px;margin-bottom:6px;white-space:nowrap;opacity:.7;letter-spacing:.5px}.stat-value{font-size:20px;line-height:1}.action-button#start-study-btn{position:fixed;bottom:24px;left:16px;right:16px;width:calc(100% - 32px)!important;z-index:100;padding:16px;border-radius:16px;box-shadow:0 8px 32px #0006;margin-bottom:0;font-size:16px;border:1px solid rgba(255,255,255,.1);order:1}.io-row{display:none}.study-controls{display:none;display:flex;margin-bottom:16px}.study-filter-toggles{width:100%;background:var(--bg-card);border-radius:12px}.filter-toggle{flex:1;justify-content:center;padding:10px;font-size:11px}.cards-section-title{margin-top:16px;margin-bottom:8px;margin-left:4px;font-size:11px;opacity:.5}.card-list{background:transparent;border:none;gap:0;overflow:hidden;border-radius:16px;box-shadow:0 1px 3px #0000000d}.card-list-item{flex-direction:row;align-items:center;gap:12px;padding:16px;background:var(--bg-card);border:none;border-bottom:1px solid var(--border-subtle);border-radius:0;margin-bottom:0;min-height:72px}.card-list-item:last-child{border-bottom:none}.card-due-dot{width:8px;height:8px;margin-right:0;background:var(--grade-hard)}.card-list-left{width:auto;flex:1;display:flex;flex-direction:column;gap:4px}.card-list-title{font-size:16px;font-weight:600;color:var(--text-primary);margin-bottom:0;line-height:1.3}.card-list-meta{font-size:12px;color:var(--text-tertiary);gap:8px}.card-type-badge{font-size:9px;padding:2px 6px;background:var(--bg-elevated);color:var(--text-secondary);border-radius:4px;letter-spacing:.5px}.card-list-right{width:auto;border-top:none;padding-top:0;margin-top:0;gap:4px}.card-edit-btn,.card-delete-btn{width:36px;height:36px;background:transparent;color:var(--text-muted);border-radius:50%}.card-edit-btn:active,.card-delete-btn:active{background:var(--bg-elevated);color:var(--text-primary)}.study-container{height:auto;min-height:80vh;justify-content:flex-start;margin-top:0;padding-bottom:40px}.study-progress{width:100%;text-align:center;padding:12px;background:var(--bg-elevated);border-radius:8px;margin-bottom:16px}.study-card{padding:24px 16px;border:none;background:transparent}.study-prompt{font-size:22px;line-height:1.4;font-weight:700}.grade-buttons{grid-template-columns:1fr 1fr;gap:12px;margin-top:24px}.grade-btn{display:flex!important;flex-direction:column;align-items:center;justify-content:center;padding:20px 12px!important;border-radius:20px!important;border:none!important;box-shadow:0 4px 16px #00000014;min-height:110px;transition:transform .1s linear}.grade-btn:active{transform:scale(.96)}.grade-btn.fail{background:#fee2e2!important;color:#991b1b!important}.grade-btn.hard{background:#ffedd5!important;color:#9a3412!important}.grade-btn.good{background:#e0f2fe!important;color:#075985!important}.grade-btn.easy{background:#dcfce7!important;color:#166534!important}[data-theme=dark] .grade-btn.fail{background:#3f0e0e!important;color:#fecaca!important}[data-theme=dark] .grade-btn.hard{background:#431407!important;color:#fed7aa!important}[data-theme=dark] .grade-btn.good{background:#0c4a6e!important;color:#bae6fd!important}[data-theme=dark] .grade-btn.easy{background:#064e3b!important;color:#a7f3d0!important}.grade-btn .grade-label{font-size:18px!important;font-weight:800!important;margin-bottom:4px;letter-spacing:-.5px;text-transform:capitalize}.grade-btn .grade-desc{font-size:13px!important;opacity:.9;font-weight:500;margin-bottom:8px}.grade-btn .grade-interval{font-size:11px;font-weight:700;opacity:.8;background:#00000014;padding:3px 8px;border-radius:99px}.grade-btn .kbd-hint{display:none!important}.add-card-container{padding:0}.form-group label{font-size:12px;text-transform:uppercase;letter-spacing:1px;color:var(--text-tertiary)}textarea{min-height:120px}.add-card-actions{position:fixed;bottom:0;left:0;width:100%;padding:16px;background:var(--bg-card);border-top:1px solid var(--border-subtle);flex-direction:row;gap:12px;z-index:100}.add-card-btn{flex:2}.cancel-btn{flex:1;background:transparent;border:none}input,textarea,select{font-size:16px!important;background:var(--bg-input);border:1px solid var(--border-subtle);border-radius:8px;padding:12px}.access-gate form{width:90%!important;border:none!important;background:transparent!important}.access-gate input{background:var(--bg-card)!important;text-align:center;font-size:24px!important;letter-spacing:4px}}