:root{--primary: #3b82f6;--primary-light: #dbeafe;--bg-gradient: linear-gradient(135deg, #f8fafc 0%, #eff6ff 100%);--text-dark: #1e293b;--text-gray: #64748b;--card-bg: rgba(255, 255, 255, .9);--shadow: 0 10px 25px -5px rgba(59, 130, 246, .1), 0 8px 10px -6px rgba(59, 130, 246, .1)}body{margin:0;font-family:Inter,system-ui,-apple-system,sans-serif;background:#f1f5f9;color:var(--text-dark);display:flex;justify-content:center;align-items:center;min-height:100vh}.login-screen{width:100%;max-width:450px;padding:20px}.login-card{background:#fff;padding:40px;border-radius:24px;box-shadow:var(--shadow);text-align:center;border:1px solid rgba(255,255,255,.8)}.login-icon{width:80px;height:80px;background:var(--primary-light);color:var(--primary);border-radius:20px;display:flex;align-items:center;justify-content:center;margin:0 auto 24px}.login-card h1{font-size:24px;margin-bottom:8px;color:var(--text-dark)}.login-card p{color:var(--text-gray);font-size:14px;margin-bottom:32px}.login-form{display:flex;flex-direction:column;gap:12px}.login-form input{padding:16px;border:2px solid #e2e8f0;border-radius:12px;font-size:16px;outline:none;transition:border-color .2s}.login-form input:focus{border-color:var(--primary)}.login-form button{padding:16px;background:var(--primary);color:#fff;border:none;border-radius:12px;font-size:16px;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;transition:transform .2s,background .2s}.login-form button:hover{background:#2563eb;transform:translateY(-2px)}.login-footer{margin-top:24px;display:flex;align-items:center;justify-content:center;gap:6px;font-size:12px;color:#10b981}.app-container{width:100%;max-width:600px;height:800px;background:#fff;border-radius:24px;box-shadow:var(--shadow);display:flex;flex-direction:column;overflow:hidden}.app-header{padding:24px;background:#fff;border-bottom:1px solid #f1f5f9;display:flex;justify-content:space-between;align-items:center}.user-info{display:flex;align-items:center;gap:12px}.avatar{width:44px;height:44px;background:var(--primary);color:#fff;border-radius:12px;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:20px}.user-info h2{margin:0;font-size:18px}.sync-tag{font-size:12px;color:#10b981;display:flex;align-items:center;gap:4px}.logout-btn{background:#f1f5f9;border:none;padding:10px;border-radius:10px;color:var(--text-gray);cursor:pointer}.logout-btn:hover{background:#fee2e2;color:#ef4444}.main-content{flex:1;padding:24px;display:flex;flex-direction:column;background:#f8fafc}.input-section{display:flex;gap:12px;margin-bottom:24px}.input-section input{flex:1;padding:14px 20px;border:1px solid #e2e8f0;border-radius:14px;font-size:15px;outline:none;box-shadow:0 2px 4px #00000005}.add-btn{width:50px;background:var(--primary);color:#fff;border:none;border-radius:14px;cursor:pointer;display:flex;align-items:center;justify-content:center}.filter-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.tab-group{display:flex;gap:12px}.tab-group button{background:none;border:none;font-size:14px;color:var(--text-gray);cursor:pointer;padding:6px 0;font-weight:500;position:relative}.tab-group button.active{color:var(--primary)}.tab-group button.active:after{content:"";position:absolute;bottom:0;left:0;width:100%;height:2px;background:var(--primary)}.clear-action{background:#fff1f2;color:#e11d48;border:none;padding:6px 12px;border-radius:8px;font-size:12px;cursor:pointer;display:flex;align-items:center;gap:4px}.notes-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:12px}.note-item{background:#fff;padding:16px;border-radius:16px;display:flex;align-items:center;gap:12px;border:1px solid #f1f5f9;transition:all .2s}.note-item:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000000d}.note-item.done{background:#f8fafc;opacity:.8}.check-box{background:none;border:none;color:#cbd5e1;cursor:pointer;padding:0}.check-box .checked{color:var(--primary)}.note-text{flex:1;font-size:15px}.done .note-text{text-decoration:line-through;color:var(--text-gray)}.del-btn{background:none;border:none;color:#cbd5e1;cursor:pointer;padding:4px}.del-btn:hover{color:#ef4444}.empty-placeholder{text-align:center;padding:100px 0;color:var(--text-gray)}.empty-placeholder h3{margin:16px 0 8px;color:var(--text-dark)}.spin{animation:spin 2s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}