:root{--bg-primary:#0d1117;--bg-surface:#161b22;--bg-elevated:#21262d;--bg-overlay:#0009;--border-default:#30363d;--border-muted:#21262d;--text-primary:#e6edf3;--text-secondary:#8b949e;--text-muted:#484f58;--accent-primary:#58a6ff;--accent-hover:#79c0ff;--accent-muted:#58a6ff1a;--success:#3fb950;--success-hover:#2ea043;--error:#f85149;--warning:#d29922;--space-xs:4px;--space-sm:8px;--space-md:16px;--space-lg:24px;--space-xl:32px;--space-2xl:48px;--radius-sm:6px;--radius-md:8px;--radius-lg:12px;--radius-xl:16px;--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 12px #0006;--shadow-lg:0 8px 24px #00000080;--transition-fast:150ms ease;--transition-normal:250ms ease;--font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}*,:after,:before{box-sizing:border-box;margin:0;padding:0}html{overflow:auto}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:#0d1117;background-color:var(--bg-primary);color:#e6edf3;color:var(--text-primary);line-height:1.5}body,button{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-family:var(--font-family)}button{cursor:pointer;transition:all .15s ease;transition:all var(--transition-fast)}button:active{transform:scale(.97)}input{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-family:var(--font-family)}.error{color:#f85149;color:var(--error);font-size:.875rem;padding:8px 0;padding:var(--space-sm) 0;text-align:center}.spinner{animation:spin .6s linear infinite;border:3px solid #30363d;border-top-color:#58a6ff;border:3px solid var(--border-default);border-radius:50%;border-top-color:var(--accent-primary);height:24px;margin:16px auto;margin:var(--space-md) auto;width:24px}@keyframes spin{to{transform:rotate(1turn)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.dashboard{animation:fadeIn var(--transition-normal);min-height:100vh}.dashboard-header{align-items:center;background:var(--bg-surface);border-bottom:1px solid var(--border-default);display:flex;justify-content:space-between;padding:var(--space-md) var(--space-xl);position:-webkit-sticky;position:sticky;top:0;z-index:100}.dashboard-header-left{align-items:center;display:flex;gap:var(--space-md)}.dashboard-header-left h1{-webkit-text-fill-color:#0000;background:linear-gradient(135deg,var(--accent-primary),#a371f7);-webkit-background-clip:text;background-clip:text;font-size:1.25rem;font-weight:700}.dashboard-header-right{align-items:center;display:flex;gap:var(--space-md)}.dashboard-greeting{color:var(--text-secondary);font-size:.9rem}.dashboard-greeting span{color:var(--text-primary);font-weight:600}.logout-button{background:none;border:1px solid var(--border-default);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:.85rem;font-weight:500;padding:8px 16px;transition:all var(--transition-fast)}.logout-button:hover{background:#f851491a;border-color:var(--error);color:var(--error)}.dashboard-body{margin:0 auto;max-width:1200px;padding:var(--space-xl)}.dashboard-search{margin-bottom:var(--space-xl)}.search-input{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-md);color:var(--text-primary);font-family:var(--font-family);font-size:.95rem;padding:12px var(--space-lg);transition:border-color var(--transition-fast);width:100%}.search-input::placeholder{color:var(--text-muted)}.search-input:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-muted);outline:none}.dashboard-content{grid-gap:var(--space-xl);display:grid;gap:var(--space-xl);grid-template-columns:1fr 1fr}.spreadsheet-section{background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-lg);padding:var(--space-xl)}.spreadsheet-section h3{color:var(--text-primary);font-size:1.1rem;font-weight:600;margin-bottom:var(--space-lg)}.create-button{background:var(--accent-muted);border:1px dashed var(--accent-primary);border-radius:var(--radius-sm);color:var(--accent-primary);font-size:.9rem;font-weight:500;margin-bottom:var(--space-lg);padding:10px;transition:all var(--transition-fast);width:100%}.create-button:hover{background:#58a6ff26}.divider{display:none}.spreadsheet-cards{display:flex;flex-direction:column;gap:var(--space-sm)}.spreadsheet-card{align-items:center;background:var(--bg-elevated);border:1px solid 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var(--transition-fast)}.card-action-btn:first-child{border-top-right-radius:var(--radius-md)}.card-action-btn:last-child,.card-action-btn:only-child{border-bottom-right-radius:var(--radius-md)}.card-action-btn:only-child{border-top-right-radius:var(--radius-md)}.card-action-btn:hover{background:var(--accent-muted);color:var(--accent-primary)}.card-action-delete:hover{background:#f851491a;color:var(--error)}.empty-state{color:var(--text-muted);padding:var(--space-xl) var(--space-md);text-align:center}.empty-state p:first-child{color:var(--text-secondary);font-size:.95rem;margin-bottom:var(--space-xs)}.empty-state p:last-child{font-size:.85rem}.modal-content form{display:flex;flex-direction:column;gap:var(--space-md)}.modal-content-label{color:var(--text-secondary);font-size:.9rem;font-weight:500;margin-bottom:var(--space-xs)}.modal-content input[type=text]{background:var(--bg-elevated);border:1px solid var(--border-default);border-radius:var(--radius-sm);color:var(--text-primary);font-size:.95rem;padding:12px var(--space-md);transition:border-color var(--transition-fast)}.modal-content input[type=text]::placeholder{color:var(--text-muted)}.modal-content input[type=text]:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-muted);outline:none}.modal-content button[type=submit]{background:var(--accent-primary);border:none;border-radius:var(--radius-sm);color:#fff;font-size:.95rem;font-weight:600;padding:12px;transition:all var(--transition-fast)}.modal-content button[type=submit]:hover{background:var(--accent-hover)}.guest-button{background-color:var(--bg-elevated);font-size:.9rem;padding:10px 20px}@media screen and (max-width:768px){.dashboard-content{grid-template-columns:1fr}.dashboard-header{gap:var(--space-md);text-align:center}.dashboard-header,.dashboard-header-right{flex-direction:column}}@media screen and (max-width:480px){.dashboard-body,.spreadsheet-section{padding:var(--space-md)}}.modal-overlay{align-items:center;animation:fadeIn var(--transition-fast);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background-color:var(--bg-overlay);bottom:0;display:flex;justify-content:center;left:0;position:fixed;right:0;top:0;z-index:1000}.modal-content{animation:slideUp var(--transition-normal);background-color:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);max-width:90%;padding:var(--space-xl);position:relative;width:420px}.modal-close{align-items:center;border-radius:var(--radius-sm);color:var(--text-muted);cursor:pointer;display:flex;font-size:1.5rem;height:28px;justify-content:center;line-height:1;position:absolute;right:var(--space-md);top:var(--space-md);transition:color var(--transition-fast);width:28px}.modal-close:hover{background:var(--bg-elevated);color:var(--text-primary)}.confirm-overlay{align-items:center;animation:fadeIn var(--transition-fast);-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);background:var(--bg-overlay);bottom:0;display:flex;justify-content:center;left:0;position:fixed;right:0;top:0;z-index:1500}.confirm-dialog{animation:slideUp var(--transition-normal);background:var(--bg-surface);border:1px solid var(--border-default);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);max-width:90%;padding:var(--space-xl);width:380px}.confirm-title{color:var(--text-primary);font-size:1.1rem;font-weight:600;margin-bottom:var(--space-sm)}.confirm-message{color:var(--text-secondary);font-size:.9rem;line-height:1.5;margin-bottom:var(--space-xl)}.confirm-actions{display:flex;gap:var(--space-sm);justify-content:flex-end}.confirm-cancel{background:var(--bg-elevated);border:1px solid 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var(--transition-fast)}.guest-button:hover{background:var(--bg-surface);border-color:var(--text-secondary);color:var(--text-primary)}.back-home-button{background:none;border:1px solid var(--border-default);border-radius:var(--radius-sm);color:var(--text-secondary);font-size:.9rem;margin-top:var(--space-xl);padding:10px 20px;transition:all var(--transition-fast)}.back-home-button:hover{border-color:var(--text-secondary);color:var(--text-primary)}@media screen and (max-width:480px){.auth-card{max-width:100%}}.spreadsheet-page{animation:fadeIn var(--transition-normal);display:flex;flex-direction:column;min-height:100vh}.spreadsheet-toolbar{background:var(--bg-surface);border-bottom:1px solid var(--border-default);flex-wrap:wrap;justify-content:space-between;padding:var(--space-md) var(--space-xl)}.spreadsheet-toolbar,.spreadsheet-toolbar-left{align-items:center;display:flex;gap:var(--space-md)}.back-dashboard-button{align-items:center;background:none;border:1px solid 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var(--transition-fast)}.invite-home-btn:hover{background:var(--accent-hover)}.app-loading{align-items:center;display:flex;flex-direction:column;gap:var(--space-xl);justify-content:center;min-height:100vh}.app-loading-brand{-webkit-text-fill-color:#0000;background:linear-gradient(135deg,var(--accent-primary),#a371f7);-webkit-background-clip:text;background-clip:text;font-size:2rem;font-weight:700}.not-found{align-items:center;display:flex;flex-direction:column;justify-content:center;min-height:100vh;padding:var(--space-xl);text-align:center}.not-found h1{-webkit-text-fill-color:#0000;background:linear-gradient(135deg,var(--accent-primary),#a371f7);-webkit-background-clip:text;background-clip:text;font-size:5rem;font-weight:700;line-height:1;margin-bottom:var(--space-md)}.not-found p{color:var(--text-secondary);font-size:1.1rem;margin-bottom:var(--space-xl)}.not-found-link{background:var(--accent-primary);border-radius:var(--radius-sm);color:#fff;font-size:.95rem;font-weight:600;padding:10px 24px;text-decoration:none;transition:all var(--transition-fast)}.not-found-link:hover{background:var(--accent-hover)}
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