:root{--color-primary: #2457a6;--color-primary-hover: #1c4483;--color-primary-light: #dee9fa;--color-primary-dark: #152238;--color-success: #2e7d53;--color-success-hover: #256943;--color-success-light: #e1f3e8;--color-danger: #b23a32;--color-danger-hover: #962f28;--color-danger-light: #fae6e3;--color-warning: #a6650e;--color-warning-hover: #8a5409;--color-white: #ffffff;--color-gray-50: #eef3fa;--color-gray-100: #e2e9f5;--color-gray-200: #d3e0f0;--color-gray-300: #b4c7e0;--color-gray-400: #8296b3;--color-gray-500: #6c81a5;--color-gray-600: #4a5c79;--color-gray-700: #33455f;--color-gray-800: #223354;--color-gray-900: #152238;--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--font-sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, sans-serif;--font-serif: "Source Serif 4", Georgia, serif;--font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace;--text-xs: .75rem;--text-sm: .875rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--font-normal: 400;--font-medium: 500;--font-semibold: 600;--font-bold: 700;--radius-sm: .25rem;--radius-md: .375rem;--radius-lg: .5rem;--radius-xl: .75rem;--radius-2xl: 1rem;--radius-full: 9999px;--shadow-sm: 0 1px 2px 0 rgb(0 0 0 / .05);--shadow-md: 0 4px 6px -1px rgb(0 0 0 / .1), 0 2px 4px -2px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--shadow-xl: 0 20px 25px -5px rgb(0 0 0 / .1), 0 8px 10px -6px rgb(0 0 0 / .1);--transition-fast: .15s ease;--transition-normal: .2s ease;--transition-slow: .3s ease;--z-dropdown: 100;--z-sticky: 200;--z-fixed: 300;--z-modal-backdrop: 400;--z-modal: 500;--z-popover: 600;--z-tooltip: 700}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:var(--font-sans);font-size:var(--text-base);line-height:1.6;color:var(--color-gray-900);background-color:var(--color-gray-50);min-height:100vh}input,button,textarea,select{font-family:inherit;font-size:inherit}:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.animate-spin{animation:spin 1s linear infinite}.animate-fade-in{animation:fadeIn var(--transition-normal) ease-out}.animate-slide-up{animation:slideUp var(--transition-normal) ease-out}.container{width:100%;max-width:1280px;margin:0 auto;padding:0 var(--space-4)}.min-h-screen{min-height:100vh}.flex{display:flex}.flex-col{flex-direction:column}.items-center{align-items:center}.justify-center{justify-content:center}.justify-between{justify-content:space-between}.gap-2{gap:var(--space-2)}.gap-3{gap:var(--space-3)}.gap-4{gap:var(--space-4)}.gap-6{gap:var(--space-6)}.card{background:var(--color-white);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);border:1px solid var(--color-gray-100);overflow:hidden}.card-header{padding:var(--space-6);border-bottom:1px solid var(--color-gray-100)}.card-body{padding:var(--space-6)}.card-footer{padding:var(--space-4) var(--space-6);border-top:1px solid var(--color-gray-100);background:var(--color-gray-50)}.form-group{margin-bottom:var(--space-4)}.form-label{display:block;font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-gray-700);margin-bottom:var(--space-1)}.form-input{width:100%;padding:var(--space-3) var(--space-4);font-size:var(--text-base);color:var(--color-gray-900);background:var(--color-white);border:1px solid var(--color-gray-300);border-radius:var(--radius-lg);transition:border-color var(--transition-fast),box-shadow var(--transition-fast)}.form-input::placeholder{color:var(--color-gray-400)}.form-input:hover{border-color:var(--color-gray-400)}.form-input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px var(--color-primary-light)}.form-input:disabled{background:var(--color-gray-100);cursor:not-allowed}.form-error{margin-top:var(--space-1);font-size:var(--text-sm);color:var(--color-danger)}.form-hint{margin-top:var(--space-1);font-size:var(--text-sm);color:var(--color-gray-500)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-3) var(--space-5);font-size:var(--text-sm);font-weight:var(--font-medium);border-radius:var(--radius-lg);border:none;cursor:pointer;transition:all var(--transition-fast);text-decoration:none;white-space:nowrap}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:var(--color-primary);color:var(--color-white)}.btn-primary:hover:not(:disabled){background:var(--color-primary-hover)}.btn-primary:active:not(:disabled){background:var(--color-primary-dark)}.btn-secondary{background:var(--color-gray-100);color:var(--color-gray-700)}.btn-secondary:hover:not(:disabled){background:var(--color-gray-200)}.btn-danger{background:var(--color-danger);color:var(--color-white)}.btn-danger:hover:not(:disabled){background:var(--color-danger-hover)}.btn-ghost{background:transparent;color:var(--color-gray-600)}.btn-ghost:hover:not(:disabled){background:var(--color-gray-100);color:var(--color-gray-900)}.btn-sm{padding:var(--space-1) var(--space-3);font-size:var(--text-xs)}.btn-lg{padding:var(--space-4) var(--space-6);font-size:var(--text-base)}.btn-full{width:100%}.btn-icon{padding:var(--space-2)}.alert{display:flex;align-items:center;gap:var(--space-2);padding:var(--space-3) var(--space-4);border-radius:var(--radius-lg);font-size:var(--text-sm)}.alert-error{background:var(--color-danger-light);color:var(--color-danger);border:1px solid #fecaca}.alert-success{background:var(--color-success-light);color:var(--color-success);border:1px solid #a7f3d0}.alert-info{background:var(--color-primary-light);color:var(--color-primary);border:1px solid #c7d2fe}.input-group{position:relative}.input-group .form-input{padding-left:var(--space-10)}.input-icon{position:absolute;left:var(--space-3);top:50%;transform:translateY(-50%);color:var(--color-gray-400);pointer-events:none}.checkbox-wrapper{display:flex;align-items:center;gap:var(--space-2);cursor:pointer}.checkbox-input{width:1.125rem;height:1.125rem;accent-color:var(--color-primary);border:1px solid var(--color-gray-300);border-radius:var(--radius-sm);cursor:pointer}.checkbox-input:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px}.checkbox-label{font-size:var(--text-sm);color:var(--color-gray-700);-webkit-user-select:none;user-select:none}.link{color:var(--color-primary);font-weight:var(--font-medium);text-decoration:none;transition:color var(--transition-fast)}.link:hover{color:var(--color-primary-hover);text-decoration:underline}.divider{display:flex;align-items:center;gap:var(--space-4);color:var(--color-gray-400);font-size:var(--text-sm)}.divider:before,.divider:after{content:"";flex:1;height:1px;background:var(--color-gray-200)}.page-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-4) var(--space-6);background:var(--color-white);border-bottom:1px solid var(--color-gray-100)}.page-title{font-family:var(--font-serif);font-size:var(--text-xl);font-weight:600;color:var(--color-gray-900)}.page-actions,.user-menu{display:flex;align-items:center;gap:var(--space-3)}.user-name{font-size:var(--text-sm);font-weight:var(--font-medium);color:var(--color-gray-700)}.task-list{list-style:none}.task-item{display:flex;align-items:center;justify-content:space-between;padding:var(--space-3) var(--space-4);background:var(--color-gray-50);border-radius:var(--radius-lg);border:1px solid var(--color-gray-100);transition:all var(--transition-fast)}.task-item:hover{border-color:var(--color-gray-200);box-shadow:var(--shadow-sm)}.task-content{display:flex;align-items:center;gap:var(--space-3);flex:1;min-width:0}.task-checkbox{width:1.25rem;height:1.25rem;accent-color:var(--color-primary);cursor:pointer;flex-shrink:0}.task-title{font-size:var(--text-base);color:var(--color-gray-900);word-break:break-word;transition:all var(--transition-fast)}.task-item.completed .task-title{text-decoration:line-through;color:var(--color-gray-400)}.task-delete{padding:var(--space-1) var(--space-2);font-size:var(--text-xs);color:var(--color-gray-400);background:transparent;border:none;border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);opacity:0}.task-item:hover .task-delete{opacity:1}.task-delete:hover{color:var(--color-danger);background:var(--color-danger-light)}.task-empty{text-align:center;padding:var(--space-12) var(--space-4);color:var(--color-gray-500)}.task-empty-icon{width:4rem;height:4rem;margin:0 auto var(--space-4);color:var(--color-gray-300)}.task-empty-title{font-size:var(--text-lg);font-weight:var(--font-medium);color:var(--color-gray-600);margin-bottom:var(--space-1)}.task-empty-text{font-size:var(--text-sm)}.loading-spinner{display:flex;align-items:center;justify-content:center;padding:var(--space-8)}.spinner{width:2.5rem;height:2.5rem;border:3px solid var(--color-gray-200);border-top-color:var(--color-primary);border-radius:50%;animation:spin 1s linear infinite}.spinner-sm{width:1rem;height:1rem;border-width:2px}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:var(--space-8) var(--space-4);background:var(--color-gray-50)}.auth-card{width:100%;max-width:420px}.auth-header{text-align:center;margin-bottom:var(--space-8)}.auth-logo{width:3.5rem;height:3.5rem;margin:0 auto var(--space-4);background:linear-gradient(135deg,#2457a6,#5b8def 130%);border-radius:var(--radius-xl);display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-lg)}.auth-logo svg{width:2rem;height:2rem;color:var(--color-white)}.auth-title{font-family:var(--font-serif);font-size:var(--text-2xl);font-weight:600;color:var(--color-gray-900);margin-bottom:var(--space-1)}.auth-subtitle{font-size:var(--text-base);color:var(--color-gray-500)}.auth-form{margin-bottom:var(--space-6)}.auth-footer{text-align:center;padding-top:var(--space-4);border-top:1px solid var(--color-gray-100)}.auth-footer-text{font-size:var(--text-sm);color:var(--color-gray-600)}.auth-footer-link{margin-left:var(--space-1)}.navbar{position:sticky;top:0;z-index:var(--z-sticky);background:var(--color-white);border-bottom:1px solid var(--color-gray-100);box-shadow:var(--shadow-sm)}.navbar-content{max-width:1280px;margin:0 auto;padding:0 var(--space-4);height:4rem;display:flex;align-items:center;justify-content:space-between}.navbar-brand{font-family:var(--font-serif);font-size:var(--text-xl);font-weight:600;color:var(--color-gray-900);text-decoration:none;display:flex;align-items:center;gap:var(--space-2)}.navbar-brand:hover{color:var(--color-primary)}.main-content{max-width:1280px;margin:0 auto;padding:var(--space-8) var(--space-4)}@media(max-width:640px){:root{--space-8: 1.5rem;--space-12: 2rem}.auth-card{border-radius:var(--radius-lg)}.card-header,.card-body,.card-footer{padding:var(--space-4)}.page-header{flex-direction:column;align-items:flex-start;gap:var(--space-3)}.task-content{gap:var(--space-2)}.task-delete{opacity:1}}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--color-gray-100)}::-webkit-scrollbar-thumb{background:var(--color-gray-300);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--color-gray-400)}