*{margin:0;padding:0;box-sizing:border-box}:root{--primary-color: #667eea;--secondary-color: #764ba2;--accent-color: #f093fb;--background-color: #f8fafc;--card-background: #ffffff;--text-color: #2d3748;--text-secondary: #718096;--border-color: #e2e8f0;--success-color: #48bb78;--shadow: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .1), 0 4px 6px -2px rgba(0, 0, 0, .05)}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.6;color:var(--text-color);background:linear-gradient(135deg,var(--primary-color) 0%,var(--secondary-color) 100%);min-height:100vh;padding:20px}#root{max-width:800px;margin:0 auto;min-height:calc(100vh - 40px);display:flex;flex-direction:column}@media (max-width: 768px){body{padding:10px}#root{min-height:calc(100vh - 20px)}}.app-container{background:var(--card-background);border-radius:20px;box-shadow:var(--shadow-lg);overflow:hidden;flex:1;display:flex;flex-direction:column}.app-header{background:linear-gradient(135deg,var(--primary-color) 0%,var(--secondary-color) 100%);color:#fff;padding:2rem;text-align:center;position:relative;overflow:hidden}.app-header:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(255,255,255,.1) 0%,transparent 70%);animation:float 6s ease-in-out infinite}@keyframes float{0%,to{transform:translate(-50%,-50%) rotate(0)}50%{transform:translate(-50%,-50%) rotate(180deg)}}.app-title{font-size:2.5rem;font-weight:700;margin-bottom:.5rem;position:relative;z-index:1}.app-subtitle{font-size:1.1rem;opacity:.9;position:relative;z-index:1}.app-content{flex:1;padding:2rem;display:flex;flex-direction:column;gap:2rem}.create-todo-container{background:var(--card-background);border-radius:16px;padding:2rem;box-shadow:var(--shadow);border:1px solid var(--border-color)}.create-todo-title{font-size:1.5rem;font-weight:600;margin-bottom:1.5rem;color:var(--text-color);text-align:center}.form-group{margin-bottom:1.5rem}.form-input{width:100%;padding:1rem;border:2px solid var(--border-color);border-radius:12px;font-size:1rem;transition:all .3s ease;background:#fafafa}.form-input:focus{outline:none;border-color:var(--primary-color);background:#fff;transform:translateY(-2px);box-shadow:0 4px 12px #667eea26}.form-input::placeholder{color:var(--text-secondary)}.btn-primary{width:100%;padding:1rem 2rem;background:linear-gradient(135deg,var(--primary-color) 0%,var(--secondary-color) 100%);color:#fff;border:none;border-radius:12px;font-size:1.1rem;font-weight:600;cursor:pointer;transition:all .3s ease;position:relative;overflow:hidden}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px #667eea4d}.btn-primary:active{transform:translateY(0)}.todos-container{flex:1}.todos-title{font-size:1.5rem;font-weight:600;margin-bottom:1.5rem;color:var(--text-color);text-align:center}.todos-grid{display:grid;gap:1.5rem;grid-template-columns:repeat(auto-fill,minmax(300px,1fr))}.todo-card{background:var(--card-background);border-radius:16px;padding:1.5rem;box-shadow:var(--shadow);border:1px solid var(--border-color);transition:all .3s ease;position:relative;overflow:hidden}.todo-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.todo-card.completed{opacity:.7;background:#f7fafc}.todo-card.completed:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--success-color)}.todo-title{font-size:1.25rem;font-weight:600;margin-bottom:.75rem;color:var(--text-color);line-height:1.4}.todo-description{color:var(--text-secondary);margin-bottom:1.5rem;line-height:1.6}.todo-actions{display:flex;gap:.75rem;margin-top:auto}.btn-complete{flex:1;padding:.75rem 1rem;border:none;border-radius:8px;font-weight:500;cursor:pointer;transition:all .3s ease;font-size:.9rem}.btn-complete:not(:disabled){background:linear-gradient(135deg,var(--success-color) 0%,#38a169 100%);color:#fff}.btn-complete:disabled{background:#e2e8f0;color:var(--text-secondary);cursor:not-allowed}.btn-complete:not(:disabled):hover{transform:translateY(-1px);box-shadow:0 4px 12px #48bb784d}.site-footer{background:var(--card-background);padding:1.5rem;text-align:center;color:var(--text-secondary);border-top:1px solid var(--border-color);margin-top:auto}.empty-state{text-align:center;padding:3rem 1rem;color:var(--text-secondary)}.empty-state-icon{font-size:4rem;margin-bottom:1rem;opacity:.5}.empty-state-title{font-size:1.25rem;font-weight:500;margin-bottom:.5rem}.empty-state-description{font-size:1rem;opacity:.8}.loading{display:inline-block;width:20px;height:20px;border:3px solid rgba(255,255,255,.3);border-radius:50%;border-top-color:#fff;animation:spin 1s ease-in-out infinite}@keyframes spin{to{transform:rotate(360deg)}}@media (max-width: 768px){.app-header{padding:1.5rem}.app-title{font-size:2rem}.app-subtitle{font-size:1rem}.app-content{padding:1.5rem;gap:1.5rem}.create-todo-container{padding:1.5rem}.todos-grid{grid-template-columns:1fr;gap:1rem}.todo-card{padding:1.25rem}.todo-title{font-size:1.1rem}.form-input,.btn-primary{padding:.875rem}}@media (max-width: 480px){.app-header{padding:1rem}.app-title{font-size:1.75rem}.app-content,.create-todo-container,.todo-card{padding:1rem}}