:root{color-scheme:light dark;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;--bg: #0f1419;--card: #1a2332;--text: #e7ecf3;--muted: #9aa8b8;--accent: #3b82f6;--danger: #ef4444;--border: #2a3648;--error-bg: #3b1515;--error-text: #fecaca}@media(prefers-color-scheme:light){:root{--bg: #f4f6f8;--card: #ffffff;--text: #111827;--muted: #6b7280;--accent: #2563eb;--danger: #dc2626;--border: #e5e7eb;--error-bg: #fef2f2;--error-text: #991b1b}}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text)}.app-shell{max-width:720px;margin:0 auto;padding:1.5rem 1rem 3rem}h1,h2{margin:0 0 .75rem}label{display:flex;flex-direction:column;gap:.35rem;font-size:.9rem;margin-bottom:.75rem}input,textarea,button{font:inherit}input,textarea{padding:.55rem .7rem;border-radius:8px;border:1px solid var(--border);background:var(--bg);color:var(--text)}button{cursor:pointer;border:none;border-radius:8px;padding:.55rem .9rem;background:var(--accent);color:#fff}button:disabled{opacity:.6;cursor:not-allowed}button.secondary{background:transparent;color:var(--text);border:1px solid var(--border)}button.danger{background:var(--danger)}.auth-page,.tasks-page{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:1.25rem}.auth-page form,.create-form{display:flex;flex-direction:column}.error{background:var(--error-bg);color:var(--error-text);padding:.6rem .75rem;border-radius:8px}.muted{color:var(--muted);margin:0}.tasks-header{display:flex;justify-content:space-between;align-items:flex-start;gap:1rem;margin-bottom:1.25rem}.task-list{list-style:none;padding:0;margin:1rem 0 0;display:flex;flex-direction:column;gap:.75rem}.task-list li{border:1px solid var(--border);border-radius:10px;padding:.85rem}.task-list li.done .task-title{text-decoration:line-through;color:var(--muted)}.check{flex-direction:row;align-items:center;gap:.6rem;margin:0}.task-desc{margin:.4rem 0 .6rem 1.6rem;color:var(--muted)}.row{display:flex;gap:.5rem;flex-wrap:wrap}.empty{color:var(--muted)}a{color:var(--accent)}