:root{--primary-color: #2564eb;--primary-hover: #1d4ed8;--bg-color: #f3f4f6;--sidebar-bg: #f9fafb;--text-main: #1f2937;--text-muted: #6b7280;--border-color: #e5e7eb;--card-bg: rgba(255, 255, 255, .9);--danger: #ef4444;--success: #10b981;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 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);--transition: all .2s ease-in-out}*{box-sizing:border-box;margin:0;padding:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}body{background-color:var(--bg-color);color:var(--text-main);height:100vh;overflow:hidden}button{cursor:pointer;border:none;background:none;font-family:inherit}input{font-family:inherit;outline:none}.app-container{display:flex;height:100vh;width:100vw;background:linear-gradient(135deg,#e0e7ff,#f3f4f6)}.sidebar{width:280px;background-color:var(--sidebar-bg);border-right:1px solid var(--border-color);display:flex;flex-direction:column;padding:20px 0;box-shadow:var(--shadow-sm);z-index:10}.user-profile{padding:0 20px 20px;display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--border-color);margin-bottom:20px}.avatar{width:40px;height:40px;background:linear-gradient(135deg,var(--primary-color),#818cf8);border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:600;font-size:1.2rem;box-shadow:var(--shadow-md)}.user-info h3{font-size:1rem;font-weight:600}.user-info p{font-size:.8rem;color:var(--text-muted)}.notification-container{position:relative;margin-left:auto}.bell-btn{position:relative;padding:8px;color:var(--text-muted);border-radius:8px;transition:var(--transition)}.bell-btn:hover{background-color:#f3f4f6;color:var(--primary-color)}.badge{position:absolute;top:4px;right:6px;width:10px;height:10px;background-color:var(--danger);border-radius:50%;border:2px solid var(--sidebar-bg)}.notif-dropdown{position:absolute;top:100%;right:0;width:300px;background:#fff;border-radius:12px;box-shadow:var(--shadow-lg);border:1px solid var(--border-color);z-index:50;max-height:400px;overflow-y:auto;margin-top:10px}.notif-header{padding:16px;border-bottom:1px solid var(--border-color);font-weight:600;font-size:.95rem}.notif-item{padding:16px;border-bottom:1px solid var(--border-color);font-size:.9rem;display:flex;gap:12px;align-items:flex-start;transition:var(--transition)}.notif-item.unread{background-color:#eff6ff}.notif-item:hover{background-color:#f9fafb}.notif-icon{color:var(--primary-color);margin-top:2px}.menu-list{list-style:none;flex:1;overflow-y:auto}.menu-item{display:flex;align-items:center;gap:12px;padding:12px 24px;color:var(--text-main);font-weight:500;font-size:.95rem;cursor:pointer;transition:var(--transition)}.menu-item:hover{background-color:#f0fdf4;color:var(--success)}.menu-item.active{background-color:#eff6ff;color:var(--primary-color);border-left:3px solid var(--primary-color)}.main-content{flex:1;display:flex;flex-direction:column;padding:40px;overflow-y:auto;position:relative}.header{margin-bottom:30px}.header h1{font-size:2rem;font-weight:700;color:var(--primary-color);display:flex;align-items:center;gap:10px}.header p{color:var(--text-muted);margin-top:5px;font-size:.95rem}.add-task-container{background-color:var(--card-bg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:12px;padding:16px 20px;display:flex;align-items:center;gap:12px;box-shadow:var(--shadow-md);margin-bottom:24px;border:1px solid rgba(255,255,255,.5)}.add-task-btn{color:var(--primary-color)}.add-task-input{flex:1;border:none;background:transparent;font-size:1rem}.task-item{background-color:var(--card-bg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-radius:10px;padding:14px 20px;display:flex;align-items:center;gap:14px;box-shadow:var(--shadow-sm);border:1px solid rgba(255,255,255,.4);transition:var(--transition);margin-bottom:8px;cursor:pointer}.task-item:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.checkbox{width:22px;height:22px;border-radius:50%;border:2px solid var(--primary-color);display:flex;align-items:center;justify-content:center;transition:var(--transition)}.checkbox.completed{background-color:var(--primary-color)}.checkbox svg{color:#fff;width:14px;height:14px;opacity:0}.checkbox.completed svg{opacity:1}.task-title{flex:1;font-size:1rem;transition:var(--transition)}.task-title.completed{text-decoration:line-through;color:var(--text-muted)}.task-meta{display:flex;flex-direction:column;font-size:.8rem;color:var(--text-muted)}.task-meta-assignee{color:var(--primary-color);font-weight:500;display:flex;align-items:center;gap:4px}.detail-panel{width:360px;background-color:#fff;border-left:1px solid var(--border-color);display:flex;flex-direction:column;padding:24px;box-shadow:-4px 0 15px #0000000d;animation:slideInRight .3s ease-out;z-index:20}@keyframes slideInRight{0%{transform:translate(100%)}to{transform:translate(0)}}.detail-close{align-self:flex-end;color:var(--text-muted);padding:8px}.detail-title{font-size:1.25rem;font-weight:600;margin:16px 0;color:var(--text-main)}.step-list{margin:20px 0}.step-item{display:flex;align-items:center;gap:10px;padding:10px 0;border-bottom:1px solid #f3f4f6}.step-title{flex:1;font-size:.95rem}.step-title.completed{text-decoration:line-through;color:var(--text-muted)}.add-step-container{display:flex;align-items:center;gap:10px;margin-top:10px;color:var(--primary-color)}.add-step-input{border:none;font-size:.95rem;flex:1}.assign-section{margin-top:30px;padding-top:20px;border-top:1px solid var(--border-color)}.assign-title{font-size:.9rem;color:var(--text-muted);margin-bottom:10px;display:flex;align-items:center;gap:8px}.user-select{width:100%;padding:10px;border:1px solid var(--border-color);border-radius:8px;background:#f9fafb;outline:none;font-family:inherit}.auth-container{display:flex;height:100vh;align-items:center;justify-content:center;background:linear-gradient(135deg,#4f46e5,#3b82f6)}.auth-card{background:#fffffff2;padding:40px;border-radius:20px;box-shadow:0 25px 50px -12px #00000040;width:100%;max-width:400px;text-align:center}.auth-input{width:100%;padding:14px;border:1px solid var(--border-color);border-radius:10px;margin-bottom:15px}.auth-submit{width:100%;background-color:var(--primary-color);color:#fff;padding:14px;border-radius:10px;font-weight:600}.admin-table{width:100%;border-collapse:collapse;margin-top:10px}.admin-table th,.admin-table td{padding:16px;text-align:left;border-bottom:1px solid var(--border-color)}.admin-table th{background-color:#f9fafb;font-weight:600;color:var(--text-muted)}.admin-table tr:hover{background-color:#f9fafb}.admin-badge{background-color:#fef3c7;color:#d97706;padding:4px 8px;border-radius:12px;font-size:.8rem;font-weight:600}