:root{--brand: #146aff;--bg: #fff;--surface: #f8f9fb;--border: #e2e6ec;--text: #0f1117;--muted: #6b7280;--danger: #dc2626;--radius: 8px}*{box-sizing:border-box}body{margin:0;font:15px/1.6 system-ui,sans-serif;color:var(--text);background:var(--surface);-webkit-font-smoothing:antialiased}h1{font-size:1.75rem;margin:0 0 1rem;line-height:1.25}h2{font-size:1.1rem;margin:0 0 1rem;line-height:1.25}p{margin:0 0 .75rem}.page-center,.dashboard{min-height:100dvh;display:flex;flex-direction:column;align-items:center;gap:1.5rem;padding:4rem 1rem}.wordmark{max-width:clamp(80px,10dvw,120px)}.card,.todo-widget{width:100%;max-width:540px;padding:1.5rem;background:var(--bg);border:1px solid var(--border);border-radius:12px}.card{max-width:360px;padding:2rem}.field{display:flex;flex-direction:column;gap:.375rem;margin-bottom:1rem}label{font-size:.8125rem;font-weight:500;color:var(--muted)}input[type=text],input[type=email],input[type=password]{width:100%;padding:.5625rem .75rem;font:inherit;color:inherit;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);outline:none}input:focus{border-color:var(--brand);box-shadow:0 0 0 3px #146aff26}button{padding:.5625rem 1.125rem;font:inherit;color:inherit;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);cursor:pointer}button:hover{background:var(--surface)}button:disabled{opacity:.5;cursor:not-allowed}.btn-primary{width:100%;background:var(--brand);border-color:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand);filter:brightness(.92)}.link{padding:0;background:none;border:none;color:var(--brand);text-decoration:underline}.link:hover{background:none}.alert-error{padding:.625rem .75rem;margin-bottom:.75rem;font-size:.875rem;color:var(--danger);background:#fef2f2;border:1px solid #fca5a5;border-radius:var(--radius)}.toggle{margin:1rem 0 0;text-align:center;font-size:.875rem;color:var(--muted)}.toggle button{padding:.2rem}.dashboard header{display:flex;align-items:center;gap:1rem;width:100%;max-width:540px}.dashboard header .wordmark{margin-right:auto}.dashboard header p{margin:0;color:var(--muted)}.dashboard header .auth-nav{display:flex;flex-direction:row;align-items:center;gap:.25rem}.todo-widget form{display:flex;gap:.5rem;margin-bottom:1rem}.todo-widget form input{flex:1}.todo-widget ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:.375rem}.todo-widget li{display:flex;align-items:center;gap:.5rem;padding:.5rem .75rem;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}.todo-widget li label{display:flex;align-items:center;gap:.5rem;flex:1;cursor:pointer}.todo-widget li.done label span{text-decoration:line-through;color:var(--muted)}.todo-widget li button{padding:.125rem .375rem;background:none;border:none;color:var(--muted);font-size:1.25rem}.todo-widget li button:hover{background:none;color:var(--danger)}.auth-backup{width:100%;max-width:540px;background:var(--bg);border:1px solid var(--border);border-radius:12px;padding:1.5rem}.auth-backup>summary{cursor:pointer;font-weight:500;list-style:none;display:flex;align-items:center;gap:.5rem;color:var(--muted);font-size:.875rem}.auth-backup>summary:before{content:"▸";font-size:.75rem;transition:transform .15s}.auth-backup[open]>summary:before{transform:rotate(90deg)}.auth-backup-hint{margin-top:1rem;font-size:.875rem;color:var(--muted)}.auth-backup-section{margin-top:1rem;padding-top:1rem;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:.75rem}.auth-backup-section h3{font-size:.875rem;font-weight:600;margin:0}.auth-backup-phrase{width:100%;padding:.5rem .75rem;font:.875rem/1.5 monospace;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);resize:none}.auth-backup-restore{display:flex;flex-direction:column;gap:.5rem}.auth-backup-restore textarea{width:100%;padding:.5rem .75rem;font:inherit;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius);resize:none}.auth-backup-restore textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px #146aff26}.auth-backup-row{display:flex;gap:.5rem;flex-wrap:wrap}.auth-backup-success{margin:0;font-size:.875rem;color:#16a34a}